wallet-core/packages/taler-wallet-core/src/db.ts

/*
 This file is part of GNU Taler
 (C) 2021-2022 Taler Systems S.A.

 GNU Taler is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
 * Imports.
 */
import {
  Event,
  IDBDatabase,
  IDBFactory,
  IDBObjectStore,
  IDBTransaction,
} from "@gnu-taler/idb-bridge";
import {
  AgeCommitmentProof,
  AmountJson,
  AmountString,
  CoinEnvelope,
  CoinRefreshRequest,
  CoinStatus,
  MerchantContractTerms,
  DenominationInfo,
  DenominationPubKey,
  DenomSelectionState,
  EddsaPublicKeyString,
  EddsaSignatureString,
  ExchangeAuditor,
  ExchangeGlobalFees,
  InternationalizedString,
  Location,
  MerchantInfo,
  PayCoinSelection,
  PeerContractTerms,
  Product,
  RefreshReason,
  TalerErrorDetail,
  TalerProtocolDuration,
  TalerProtocolTimestamp,
  TransactionIdStr,
  UnblindedSignature,
  WireInfo,
  HashCodeString,
  Amounts,
  AttentionInfo,
  Logger,
  CoinPublicKeyString,
  TalerPreciseTimestamp,
} from "@gnu-taler/taler-util";
import {
  DbAccess,
  describeContents,
  describeIndex,
  describeStore,
  GetReadWriteAccess,
  IndexDescriptor,
  openDatabase,
  StoreDescriptor,
  StoreWithIndexes,
} from "./util/query.js";
import { RetryInfo, TaskIdentifiers } from "./util/retries.js";

/**
 * This file contains the database schema of the Taler wallet together
 * with some helper functions.
 *
 * Some design considerations:
 * - By convention, each object store must have a corresponding "<Name>Record"
 *   interface defined for it.
 * - For records that represent operations, there should be exactly
 *   one top-level enum field that indicates the status of the operation.
 *   This field should be present even if redundant, because the field
 *   will have an index.
 * - Amounts are stored as strings, except when they are needed for
 *   indexing.
 * - Every record that has a corresponding transaction item must have
 *   an index for a mandatory timestamp field.
 * - Optional fields should be avoided, use "T | undefined" instead.
 * - Do all records have some obvious, indexed field that can
 *   be used for range queries?
 *
 * @author Florian Dold <dold@taler.net>
 */

/**
 * Name of the Taler database.  This is effectively the major
 * version of the DB schema. Whenever it changes, custom import logic
 * for all previous versions must be written, which should be
 * avoided.
 */
export const TALER_DB_NAME = "taler-wallet-main-v9";

/**
 * Name of the metadata database.  This database is used
 * to track major migrations of the main Taler database.
 *
 * (Minor migrations are handled via upgrade transactions.)
 */
export const TALER_META_DB_NAME = "taler-wallet-meta";

export const CURRENT_DB_CONFIG_KEY = "currentMainDbName";

/**
 * Current database minor version, should be incremented
 * each time we do minor schema changes on the database.
 * A change is considered minor when fields are added in a
 * backwards-compatible way or object stores and indices
 * are added.
 */
export const WALLET_DB_MINOR_VERSION = 7;

/**
 * Ranges for operation status fields.
 *
 * All individual enums should make sure that the values they
 * defined are in the right range.
 */
export enum OperationStatusRange {
  // Operations that need to be actively processed.
  ACTIVE_START = 10,
  ACTIVE_END = 29,
  // Operations that are suspended and might
  // expire, but nothing else can be done.
  SUSPENDED_START = 30,
  SUSPENDED_END = 49,
  // Operations that don't need any attention or processing.
  DORMANT_START = 50,
  DORMANT_END = 69,
}

/**
 * Status of a withdrawal.
 */
export enum WithdrawalGroupStatus {
  /**
   * Reserve must be registered with the bank.
   */
  PendingRegisteringBank = 10,

  /**
   * We've registered reserve's information with the bank
   * and are now waiting for the user to confirm the withdraw
   * with the bank (typically 2nd factor auth).
   */
  PendingWaitConfirmBank = 11,

  /**
   * Querying reserve status with the exchange.
   */
  PendingQueryingStatus = 12,

  /**
   * Ready for withdrawal.
   */
  PendingReady = 13,

  /**
   * We are telling the bank that we don't want to complete
   * the withdrawal!
   */
  AbortingBank = 14,

  /**
   * Exchange wants KYC info from the user.
   */
  PendingKyc = 16,

  /**
   * Exchange is doing AML checks.
   */
  PendingAml = 17,

  SuspendedRegisteringBank = 30,
  SuspendedWaitConfirmBank = 31,
  SuspendedQueryingStatus = 32,
  SuspendedReady = 33,
  SuspendedAbortingBank = 34,
  SuspendedKyc = 35,
  SuspendedAml = 36,

  /**
   * The corresponding withdraw record has been created.
   * No further processing is done, unless explicitly requested
   * by the user.
   */
  Finished = 50,

  /**
   * The bank aborted the withdrawal.
   */
  FailedBankAborted = 51,

  FailedAbortingBank = 59,

  /**
   * Aborted in a state where we were supposed to
   * talk to the exchange.  Money might have been
   * wired or not.
   */
  AbortedExchange = 60,
}

/**
 * Extra info about a withdrawal that is used
 * with a bank-integrated withdrawal.
 */
export interface ReserveBankInfo {
  talerWithdrawUri: string;

  /**
   * URL that the user can be redirected to, and allows
   * them to confirm (or abort) the bank-integrated withdrawal.
   */
  confirmUrl: string | undefined;

  /**
   * Exchange payto URI that the bank will use to fund the reserve.
   */
  exchangePaytoUri: string;

  /**
   * Time when the information about this reserve was posted to the bank.
   *
   * Only applies if bankWithdrawStatusUrl is defined.
   *
   * Set to undefined if that hasn't happened yet.
   */
  timestampReserveInfoPosted: TalerPreciseTimestamp | undefined;

  /**
   * Time when the reserve was confirmed by the bank.
   *
   * Set to undefined if not confirmed yet.
   */
  timestampBankConfirmed: TalerPreciseTimestamp | undefined;
}

/**
 * Record that indicates the wallet trusts
 * a particular auditor.
 */
export interface AuditorTrustRecord {
  /**
   * Currency that we trust this auditor for.
   */
  currency: string;

  /**
   * Base URL of the auditor.
   */
  auditorBaseUrl: string;

  /**
   * Public key of the auditor.
   */
  auditorPub: string;

  /**
   * UIDs for the operation of adding this auditor
   * as a trusted auditor.
   *
   * (Used for backup/sync merging and tombstones.)
   */
  uids: string[];
}

/**
 * Record to indicate trust for a particular exchange.
 */
export interface ExchangeTrustRecord {
  /**
   * Currency that we trust this exchange for.
   */
  currency: string;

  /**
   * Canonicalized exchange base URL.
   */
  exchangeBaseUrl: string;

  /**
   * Master public key of the exchange.
   */
  exchangeMasterPub: string;

  /**
   * UIDs for the operation of adding this exchange
   * as trusted.
   */
  uids: string[];
}

/**
 * Status of a denomination.
 */
export enum DenominationVerificationStatus {
  /**
   * Verification was delayed.
   */
  Unverified = OperationStatusRange.ACTIVE_START,

  /**
   * Verified as valid.
   */
  VerifiedGood = OperationStatusRange.DORMANT_START,

  /**
   * Verified as invalid.
   */
  VerifiedBad = OperationStatusRange.DORMANT_START + 1,
}

export interface DenomFees {
  /**
   * Fee for withdrawing.
   */
  feeWithdraw: AmountString;

  /**
   * Fee for depositing.
   */
  feeDeposit: AmountString;

  /**
   * Fee for refreshing.
   */
  feeRefresh: AmountString;

  /**
   * Fee for refunding.
   */
  feeRefund: AmountString;
}

/**
 * Denomination record as stored in the wallet's database.
 */
export interface DenominationRecord {
  currency: string;

  amountVal: number;

  amountFrac: number;

  /**
   * The denomination public key.
   */
  denomPub: DenominationPubKey;

  /**
   * Hash of the denomination public key.
   * Stored in the database for faster lookups.
   */
  denomPubHash: string;

  fees: DenomFees;

  /**
   * Validity start date of the denomination.
   */
  stampStart: TalerProtocolTimestamp;

  /**
   * Date after which the currency can't be withdrawn anymore.
   */
  stampExpireWithdraw: TalerProtocolTimestamp;

  /**
   * Date after the denomination officially doesn't exist anymore.
   */
  stampExpireLegal: TalerProtocolTimestamp;

  /**
   * Data after which coins of this denomination can't be deposited anymore.
   */
  stampExpireDeposit: TalerProtocolTimestamp;

  /**
   * Signature by the exchange's master key over the denomination
   * information.
   */
  masterSig: string;

  /**
   * Did we verify the signature on the denomination?
   */
  verificationStatus: DenominationVerificationStatus;

  /**
   * Was this denomination still offered by the exchange the last time
   * we checked?
   * Only false when the exchange redacts a previously published denomination.
   */
  isOffered: boolean;

  /**
   * Did the exchange revoke the denomination?
   * When this field is set to true in the database, the same transaction
   * should also mark all affected coins as revoked.
   */
  isRevoked: boolean;

  /**
   * Base URL of the exchange.
   */
  exchangeBaseUrl: string;

  /**
   * Master public key of the exchange that made the signature
   * on the denomination.
   */
  exchangeMasterPub: string;

  /**
   * Latest list issue date of the "/keys" response
   * that includes this denomination.
   */
  listIssueDate: TalerProtocolTimestamp;
}

export namespace DenominationRecord {
  export function getValue(d: DenominationRecord): AmountJson {
    return {
      currency: d.currency,
      fraction: d.amountFrac,
      value: d.amountVal,
    };
  }

  export function toDenomInfo(d: DenominationRecord): DenominationInfo {
    return {
      denomPub: d.denomPub,
      denomPubHash: d.denomPubHash,
      feeDeposit: Amounts.stringify(d.fees.feeDeposit),
      feeRefresh: Amounts.stringify(d.fees.feeRefresh),
      feeRefund: Amounts.stringify(d.fees.feeRefund),
      feeWithdraw: Amounts.stringify(d.fees.feeWithdraw),
      stampExpireDeposit: d.stampExpireDeposit,
      stampExpireLegal: d.stampExpireLegal,
      stampExpireWithdraw: d.stampExpireWithdraw,
      stampStart: d.stampStart,
      value: Amounts.stringify(DenominationRecord.getValue(d)),
      exchangeBaseUrl: d.exchangeBaseUrl,
    };
  }
}

export interface ExchangeSignkeysRecord {
  stampStart: TalerProtocolTimestamp;
  stampExpire: TalerProtocolTimestamp;
  stampEnd: TalerProtocolTimestamp;
  signkeyPub: EddsaPublicKeyString;
  masterSig: EddsaSignatureString;

  /**
   * Exchange details that thiis signkeys record belongs to.
   */
  exchangeDetailsRowId: number;
}

/**
 * Exchange details for a particular
 * (exchangeBaseUrl, masterPublicKey, currency) tuple.
 */
export interface ExchangeDetailsRecord {
  rowId?: number;

  /**
   * Master public key of the exchange.
   */
  masterPublicKey: string;

  exchangeBaseUrl: string;

  /**
   * Currency that the exchange offers.
   */
  currency: string;

  /**
   * Auditors (partially) auditing the exchange.
   */
  auditors: ExchangeAuditor[];

  /**
   * Last observed protocol version.
   */
  protocolVersionRange: string;

  reserveClosingDelay: TalerProtocolDuration;

  /**
   * Fees for exchange services
   */
  globalFees: ExchangeGlobalFees[];

  /**
   * Etag of the current ToS of the exchange.
   */
  tosCurrentEtag: string;

  /**
   * Information about ToS acceptance from the user.
   */
  tosAccepted:
    | {
        etag: string;
        timestamp: TalerPreciseTimestamp;
      }
    | undefined;

  wireInfo: WireInfo;

  /**
   * Age restrictions supported by the exchange (bitmask).
   */
  ageMask?: number;
}

export interface ExchangeTosRecord {
  exchangeBaseUrl: string;

  etag: string;

  /**
   * Terms of service text or undefined if not downloaded yet.
   *
   * This is just used as a cache of the last downloaded ToS.
   *
   */
  termsOfServiceText: string | undefined;

  /**
   * Content-type of the last downloaded termsOfServiceText.
   */
  termsOfServiceContentType: string | undefined;
}

export interface ExchangeDetailsPointer {
  masterPublicKey: string;

  currency: string;

  /**
   * Timestamp when the (masterPublicKey, currency) pointer
   * has been updated.
   */
  updateClock: TalerPreciseTimestamp;
}

/**
 * Exchange record as stored in the wallet's database.
 */
export interface ExchangeRecord {
  /**
   * Base url of the exchange.
   */
  baseUrl: string;

  /**
   * When did we confirm the last withdrawal from this exchange?
   *
   * Used mostly in the UI to suggest exchanges.
   */
  lastWithdrawal?: TalerPreciseTimestamp;

  /**
   * Pointer to the current exchange details.
   *
   * Should usually not change.  Only changes when the
   * exchange advertises a different master public key and/or
   * currency.
   *
   * We could use a rowID here, but having the currency in the
   * details pointer lets us do fewer DB queries
   */
  detailsPointer: ExchangeDetailsPointer | undefined;

  /**
   * Is this a permanent or temporary exchange record?
   */
  permanent: boolean;

  /**
   * Last time when the exchange was updated (both /keys and /wire).
   */
  lastUpdate: TalerPreciseTimestamp | undefined;

  /**
   * Next scheduled update for the exchange.
   *
   * (This field must always be present, so we can index on the timestamp.)
   */
  nextUpdate: TalerPreciseTimestamp;

  lastKeysEtag: string | undefined;

  lastWireEtag: string | undefined;

  /**
   * Next time that we should check if coins need to be refreshed.
   *
   * Updated whenever the exchange's denominations are updated or when
   * the refresh check has been done.
   */
  nextRefreshCheck: TalerPreciseTimestamp;

  /**
   * Public key of the reserve that we're currently using for
   * receiving P2P payments.
   */
  currentMergeReserveRowId?: number;
}

export enum PlanchetStatus {
  Pending = 10 /* ACTIVE_START */,
  KycRequired = 11 /* ACTIVE_START + 1 */,
  WithdrawalDone = 50 /* DORMANT_START */,
}

/**
 * A coin that isn't yet signed by an exchange.
 */
export interface PlanchetRecord {
  /**
   * Public key of the coin.
   */
  coinPub: string;

  /**
   * Private key of the coin.
   */
  coinPriv: string;

  /**
   * Withdrawal group that this planchet belongs to
   * (or the empty string).
   */
  withdrawalGroupId: string;

  /**
   * Index within the withdrawal group (or -1).
   */
  coinIdx: number;

  planchetStatus: PlanchetStatus;

  lastError: TalerErrorDetail | undefined;

  denomPubHash: string;

  blindingKey: string;

  withdrawSig: string;

  coinEv: CoinEnvelope;

  coinEvHash: string;

  ageCommitmentProof?: AgeCommitmentProof;
}

export enum CoinSourceType {
  Withdraw = "withdraw",
  Refresh = "refresh",
  Tip = "tip",
}

export interface WithdrawCoinSource {
  type: CoinSourceType.Withdraw;

  /**
   * Can be the empty string for orphaned coins.
   */
  withdrawalGroupId: string;

  /**
   * Index of the coin in the withdrawal session.
   */
  coinIndex: number;

  /**
   * Reserve public key for the reserve we got this coin from.
   */
  reservePub: string;
}

export interface RefreshCoinSource {
  type: CoinSourceType.Refresh;
  refreshGroupId: string;
  oldCoinPub: string;
}

export interface TipCoinSource {
  type: CoinSourceType.Tip;
  walletTipId: string;
  coinIndex: number;
}

export type CoinSource = WithdrawCoinSource | RefreshCoinSource | TipCoinSource;

/**
 * CoinRecord as stored in the "coins" data store
 * of the wallet database.
 */
export interface CoinRecord {
  /**
   * Where did the coin come from?  Used for recouping coins.
   */
  coinSource: CoinSource;

  /**
   * Public key of the coin.
   */
  coinPub: string;

  /**
   * Private key to authorize operations on the coin.
   */
  coinPriv: string;

  /**
   * Hash of the public key that signs the coin.
   */
  denomPubHash: string;

  /**
   * Unblinded signature by the exchange.
   */
  denomSig: UnblindedSignature;

  /**
   * Base URL that identifies the exchange from which we got the
   * coin.
   */
  exchangeBaseUrl: string;

  /**
   * Blinding key used when withdrawing the coin.
   * Potentionally used again during payback.
   */
  blindingKey: string;

  /**
   * Hash of the coin envelope.
   *
   * Stored here for indexing purposes, so that when looking at a
   * reserve history, we can quickly find the coin for a withdrawal transaction.
   */
  coinEvHash: string;

  /**
   * Status of the coin.
   */
  status: CoinStatus;

  /**
   * Information about what the coin has been allocated for.
   *
   * Used for:
   * - Diagnostics
   * - Idempotency of applying a coin selection (e.g. after re-selection)
   */
  spendAllocation: CoinAllocation | undefined;

  /**
   * Maximum age of purchases that can be made with this coin.
   *
   * (Used for indexing, redundant with {@link ageCommitmentProof}).
   */
  maxAge: number;

  ageCommitmentProof: AgeCommitmentProof | undefined;
}

/**
 * Coin allocation, i.e. what a coin has been used for.
 */
export interface CoinAllocation {
  /**
   * ID of the allocation, should be the ID of the transaction that
   */
  id: TransactionIdStr;
  amount: AmountString;
}

/**
 * Status of a tip we got from a merchant.
 */
export interface TipRecord {
  /**
   * Has the user accepted the tip?  Only after the tip has been accepted coins
   * withdrawn from the tip may be used.
   */
  acceptedTimestamp: TalerPreciseTimestamp | undefined;

  /**
   * The tipped amount.
   */
  tipAmountRaw: AmountString;

  /**
   * Effect on the balance (including fees etc).
   */
  tipAmountEffective: AmountString;

  /**
   * Timestamp, the tip can't be picked up anymore after this deadline.
   */
  tipExpiration: TalerProtocolTimestamp;

  /**
   * The exchange that will sign our coins, chosen by the merchant.
   */
  exchangeBaseUrl: string;

  /**
   * Base URL of the merchant that is giving us the tip.
   */
  merchantBaseUrl: string;

  /**
   * Denomination selection made by the wallet for picking up
   * this tip.
   *
   * FIXME: Put this into some DenomSelectionCacheRecord instead of
   * storing it here!
   */
  denomsSel: DenomSelectionState;

  denomSelUid: string;

  /**
   * Tip ID chosen by the wallet.
   */
  walletTipId: string;

  /**
   * Secret seed used to derive planchets for this tip.
   */
  secretSeed: string;

  /**
   * The merchant's identifier for this tip.
   */
  merchantTipId: string;

  createdTimestamp: TalerPreciseTimestamp;

  /**
   * The url to be redirected after the tip is accepted.
   */
  next_url: string | undefined;

  /**
   * Timestamp for when the wallet finished picking up the tip
   * from the merchant.
   */
  pickedUpTimestamp: TalerPreciseTimestamp | undefined;

  status: TipRecordStatus;
}

export enum TipRecordStatus {
  PendingPickup = 10,

  SuspendidPickup = 21,

  Done = 50,
  Aborted = 51,
}

export enum RefreshCoinStatus {
  Pending = OperationStatusRange.ACTIVE_START,
  Finished = OperationStatusRange.DORMANT_START,

  /**
   * The refresh for this coin has been frozen, because of a permanent error.
   * More info in lastErrorPerCoin.
   */
  Frozen = OperationStatusRange.DORMANT_START + 1,
}

export enum OperationStatus {
  Finished = OperationStatusRange.DORMANT_START,
  Pending = OperationStatusRange.ACTIVE_START,
}

export enum RefreshOperationStatus {
  Pending = 10 /* ACTIVE_START */,
  Suspended = 20 /* DORMANT_START + 2 */,

  Finished = 50 /* DORMANT_START */,
  Failed = 51 /* DORMANT_START + 1 */,
}

export enum DepositGroupOperationStatus {
  Finished = 50 /* DORMANT_START */,
  Failed = 51 /* DORMANT_START + 1 */,
  Pending = 10 /* ACTIVE_START */,
  AbortingWithRefresh = 11 /* ACTIVE_START + 1 */,
}

/**
 * Status of a single element of a deposit group.
 */
export enum DepositElementStatus {
  Unknown = 10,
  Accepted = 20,
  KycRequired = 30,
  Wired = 40,
  RefundSuccess = 50,
  RefundFailed = 51,
}

/**
 * Additional information about the reason of a refresh.
 */
export interface RefreshReasonDetails {
  originatingTransactionId?: string;
  proposalId?: string;
}

/**
 * Group of refresh operations.  The refreshed coins do not
 * have to belong to the same exchange, but must have the same
 * currency.
 *
 * FIXME: Should include the currency as a top-level field,
 *        but we need to write a migration for that.
 */
export interface RefreshGroupRecord {
  operationStatus: RefreshOperationStatus;

  // FIXME: Put this into a different object store?
  lastErrorPerCoin: { [coinIndex: number]: TalerErrorDetail };

  /**
   * Unique, randomly generated identifier for this group of
   * refresh operations.
   */
  refreshGroupId: string;

  /**
   * Currency of this refresh group.
   *
   * FIXME: Write a migration to add this to earlier DB versions.
   */
  currency: string;

  /**
   * Reason why this refresh group has been created.
   */
  reason: RefreshReason;

  /**
   * Extra information depending on the reason.
   */
  reasonDetails?: RefreshReasonDetails;

  oldCoinPubs: string[];

  // FIXME:  Should this go into a separate
  // object store for faster updates?
  refreshSessionPerCoin: (RefreshSessionRecord | undefined)[];

  inputPerCoin: AmountString[];

  estimatedOutputPerCoin: AmountString[];

  /**
   * Flag for each coin whether refreshing finished.
   * If a coin can't be refreshed (remaining value too small),
   * it will be marked as finished, but no refresh session will
   * be created.
   */
  statusPerCoin: RefreshCoinStatus[];

  timestampCreated: TalerPreciseTimestamp;

  /**
   * Timestamp when the refresh session finished.
   */
  timestampFinished: TalerPreciseTimestamp | undefined;
}

/**
 * Ongoing refresh
 */
export interface RefreshSessionRecord {
  /**
   * 512-bit secret that can be used to derive
   * the other cryptographic material for the refresh session.
   */
  sessionSecretSeed: string;

  /**
   * Sum of the value of denominations we want
   * to withdraw in this session, without fees.
   */
  amountRefreshOutput: AmountString;

  /**
   * Hashed denominations of the newly requested coins.
   */
  newDenoms: {
    denomPubHash: string;
    count: number;
  }[];

  /**
   * The no-reveal-index after we've done the melting.
   */
  norevealIndex?: number;
}

export enum RefundReason {
  /**
   * Normal refund given by the merchant.
   */
  NormalRefund = "normal-refund",
  /**
   * Refund from an aborted payment.
   */
  AbortRefund = "abort-pay-refund",
}

export interface AllowedAuditorInfo {
  auditorBaseUrl: string;
  auditorPub: string;
}

export interface AllowedExchangeInfo {
  exchangeBaseUrl: string;
  exchangePub: string;
}

/**
 * Data extracted from the contract terms that is relevant for payment
 * processing in the wallet.
 */
export interface WalletContractData {
  products?: Product[];
  summaryI18n: { [lang_tag: string]: string } | undefined;

  /**
   * Fulfillment URL, or the empty string if the order has no fulfillment URL.
   *
   * Stored as a non-nullable string as we use this field for IndexedDB indexing.
   */
  fulfillmentUrl: string;

  contractTermsHash: string;
  fulfillmentMessage?: string;
  fulfillmentMessageI18n?: InternationalizedString;
  merchantSig: string;
  merchantPub: string;
  merchant: MerchantInfo;
  amount: AmountString;
  orderId: string;
  merchantBaseUrl: string;
  summary: string;
  autoRefund: TalerProtocolDuration | undefined;
  maxWireFee: AmountString;
  wireFeeAmortization: number;
  payDeadline: TalerProtocolTimestamp;
  refundDeadline: TalerProtocolTimestamp;
  allowedExchanges: AllowedExchangeInfo[];
  timestamp: TalerProtocolTimestamp;
  wireMethod: string;
  wireInfoHash: string;
  maxDepositFee: AmountString;
  minimumAge?: number;
  deliveryDate: TalerProtocolTimestamp | undefined;
  deliveryLocation: Location | undefined;
}

export enum PurchaseStatus {
  /**
   * Not downloaded yet.
   */
  PendingDownloadingProposal = 10,

  /**
   * The user has accepted the proposal.
   */
  PendingPaying = 11,

  /**
   * Currently in the process of aborting with a refund.
   */
  AbortingWithRefund = 12,

  /**
   * Paying a second time, likely with different session ID
   */
  PendingPayingReplay = 13,

  /**
   * Query for refunds (until query succeeds).
   */
  PendingQueryingRefund = 14,

  /**
   * Query for refund (until auto-refund deadline is reached).
   */
  PendingQueryingAutoRefund = 15,

  PendingAcceptRefund = 16,

  SuspendedDownloadingProposal = 20,
  SuspendedPaying = 21,
  SuspendedAbortingWithRefund = 22,
  SuspendedPayingReplay = 23,
  SuspendedQueryingRefund = 24,
  SuspendedQueryingAutoRefund = 25,
  SuspendedPendingAcceptRefund = 26,

  /**
   * Proposal downloaded, but the user needs to accept/reject it.
   */
  Proposed = 30,

  /**
   * The user has rejected the proposal.
   */
  AbortedProposalRefused = 50,

  /**
   * Downloading or processing the proposal has failed permanently.
   */
  FailedClaim = 51,

  /**
   * Downloaded proposal was detected as a re-purchase.
   */
  RepurchaseDetected = 52,

  /**
   * The payment has been aborted.
   */
  AbortedIncompletePayment = 53,

  /**
   * Payment was successful.
   */
  Done = 54,

  FailedAbort = 55,
}

/**
 * Partial information about the downloaded proposal.
 * Only contains data that is relevant for indexing on the
 * "purchases" object stores.
 */
export interface ProposalDownloadInfo {
  contractTermsHash: string;
  fulfillmentUrl?: string;
  currency: string;
  contractTermsMerchantSig: string;
}

export interface PurchasePayInfo {
  payCoinSelection: PayCoinSelection;
  totalPayCost: AmountString;
  payCoinSelectionUid: string;
}

/**
 * Record that stores status information about one purchase, starting from when
 * the customer accepts a proposal.  Includes refund status if applicable.
 *
 * Key: {@link proposalId}
 * Operation status: {@link purchaseStatus}
 */
export interface PurchaseRecord {
  /**
   * Proposal ID for this purchase.  Uniquely identifies the
   * purchase and the proposal.
   * Assigned by the wallet.
   */
  proposalId: string;

  /**
   * Order ID, assigned by the merchant.
   */
  orderId: string;

  merchantBaseUrl: string;

  /**
   * Claim token used when downloading the contract terms.
   */
  claimToken: string | undefined;

  /**
   * Session ID we got when downloading the contract.
   */
  downloadSessionId: string | undefined;

  /**
   * If this purchase is a repurchase, this field identifies the original purchase.
   */
  repurchaseProposalId: string | undefined;

  purchaseStatus: PurchaseStatus;

  /**
   * Private key for the nonce.
   */
  noncePriv: string;

  /**
   * Public key for the nonce.
   */
  noncePub: string;

  /**
   * Downloaded and parsed proposal data.
   */
  download: ProposalDownloadInfo | undefined;

  payInfo: PurchasePayInfo | undefined;

  /**
   * Pending removals from pay coin selection.
   *
   * Used when a the pay coin selection needs to be changed
   * because a coin became known as double-spent or invalid,
   * but a new coin selection can't immediately be done, as
   * there is not enough balance (e.g. when waiting for a refresh).
   */
  pendingRemovedCoinPubs?: string[];

  /**
   * Timestamp of the first time that sending a payment to the merchant
   * for this purchase was successful.
   */
  timestampFirstSuccessfulPay: TalerPreciseTimestamp | undefined;

  merchantPaySig: string | undefined;

  posConfirmation: string | undefined;

  /**
   * When was the purchase record created?
   */
  timestamp: TalerPreciseTimestamp;

  /**
   * When was the purchase made?
   * Refers to the time that the user accepted.
   */
  timestampAccept: TalerPreciseTimestamp | undefined;

  /**
   * Pending refunds for the purchase.  A refund is pending
   * when the merchant reports a transient error from the exchange.
   *
   * FIXME: Put this into a separate object store?
   */
  // refunds: { [refundKey: string]: WalletRefundItem };

  /**
   * When was the last refund made?
   * Set to 0 if no refund was made on the purchase.
   */
  timestampLastRefundStatus: TalerPreciseTimestamp | undefined;

  /**
   * Last session signature that we submitted to /pay (if any).
   */
  lastSessionId: string | undefined;

  /**
   * Continue querying the refund status until this deadline has expired.
   */
  autoRefundDeadline: TalerProtocolTimestamp | undefined;

  /**
   * How much merchant has refund to be taken but the wallet
   * did not picked up yet
   */
  refundAmountAwaiting: AmountString | undefined;
}

export enum ConfigRecordKey {
  WalletBackupState = "walletBackupState",
  CurrencyDefaultsApplied = "currencyDefaultsApplied",
  DevMode = "devMode",
}

/**
 * Configuration key/value entries to configure
 * the wallet.
 */
export type ConfigRecord =
  | {
      key: ConfigRecordKey.WalletBackupState;
      value: WalletBackupConfState;
    }
  | { key: ConfigRecordKey.CurrencyDefaultsApplied; value: boolean }
  | { key: ConfigRecordKey.DevMode; value: boolean };

export interface WalletBackupConfState {
  deviceId: string;
  walletRootPub: string;
  walletRootPriv: string;

  /**
   * Last hash of the canonicalized plain-text backup.
   */
  lastBackupPlainHash?: string;

  /**
   * Timestamp stored in the last backup.
   */
  lastBackupTimestamp?: TalerPreciseTimestamp;

  /**
   * Last time we tried to do a backup.
   */
  lastBackupCheckTimestamp?: TalerPreciseTimestamp;
  lastBackupNonce?: string;
}

export const enum WithdrawalRecordType {
  BankManual = "bank-manual",
  BankIntegrated = "bank-integrated",
  PeerPullCredit = "peer-pull-credit",
  PeerPushCredit = "peer-push-credit",
  Recoup = "recoup",
}

export interface WgInfoBankIntegrated {
  withdrawalType: WithdrawalRecordType.BankIntegrated;
  /**
   * Extra state for when this is a withdrawal involving
   * a Taler-integrated bank.
   */
  bankInfo: ReserveBankInfo;
}

export interface WgInfoBankManual {
  withdrawalType: WithdrawalRecordType.BankManual;
}

export interface WgInfoBankPeerPull {
  withdrawalType: WithdrawalRecordType.PeerPullCredit;

  contractTerms: any;
  /**
   * Needed to quickly construct the taler:// URI for the counterparty
   * without a join.
   */
  contractPriv: string;
}

export interface WgInfoBankPeerPush {
  withdrawalType: WithdrawalRecordType.PeerPushCredit;

  contractTerms: any;
}

export interface WgInfoBankRecoup {
  withdrawalType: WithdrawalRecordType.Recoup;
}

export type WgInfo =
  | WgInfoBankIntegrated
  | WgInfoBankManual
  | WgInfoBankPeerPull
  | WgInfoBankPeerPush
  | WgInfoBankRecoup;

export type KycUserType = "individual" | "business";

export interface KycPendingInfo {
  paytoHash: string;
  requirementRow: number;
}
/**
 * Group of withdrawal operations that need to be executed.
 * (Either for a normal withdrawal or from a tip.)
 *
 * The withdrawal group record is only created after we know
 * the coin selection we want to withdraw.
 */
export interface WithdrawalGroupRecord {
  /**
   * Unique identifier for the withdrawal group.
   */
  withdrawalGroupId: string;

  wgInfo: WgInfo;

  kycPending?: KycPendingInfo;

  /**
   * Secret seed used to derive planchets.
   * Stored since planchets are created lazily.
   */
  secretSeed: string;

  /**
   * Public key of the reserve that we're withdrawing from.
   */
  reservePub: string;

  /**
   * The reserve private key.
   *
   * FIXME: Already in the reserves object store, redundant!
   */
  reservePriv: string;

  /**
   * The exchange base URL that we're withdrawing from.
   * (Redundantly stored, as the reserve record also has this info.)
   */
  exchangeBaseUrl: string;

  /**
   * When was the withdrawal operation started started?
   * Timestamp in milliseconds.
   */
  timestampStart: TalerPreciseTimestamp;

  /**
   * When was the withdrawal operation completed?
   */
  timestampFinish?: TalerPreciseTimestamp;

  /**
   * Current status of the reserve.
   */
  status: WithdrawalGroupStatus;

  /**
   * Wire information (as payto URI) for the bank account that
   * transferred funds for this reserve.
   *
   * FIXME: Doesn't this belong to the bankAccounts object store?
   */
  senderWire?: string;

  /**
   * Restrict withdrawals from this reserve to this age.
   */
  restrictAge?: number;

  /**
   * Amount that was sent by the user to fund the reserve.
   */
  instructedAmount: AmountString;

  /**
   * Amount that was observed when querying the reserve that
   * we are withdrawing from.
   *
   * Useful for diagnostics.
   */
  reserveBalanceAmount?: AmountString;

  /**
   * Amount including fees (i.e. the amount subtracted from the
   * reserve to withdraw all coins in this withdrawal session).
   *
   * (Initial amount confirmed by the user, might differ with denomSel
   * on reselection.)
   */
  rawWithdrawalAmount: AmountString;

  /**
   * Amount that will be added to the balance when the withdrawal succeeds.
   *
   * (Initial amount confirmed by the user, might differ with denomSel
   * on reselection.)
   */
  effectiveWithdrawalAmount: AmountString;

  /**
   * Denominations selected for withdrawal.
   */
  denomsSel: DenomSelectionState;

  /**
   * UID of the denomination selection.
   *
   * Used for merging backups.
   *
   * FIXME: Should this not also include a timestamp for more logical merging?
   */
  denomSelUid: string;
}

export interface BankWithdrawUriRecord {
  /**
   * The withdraw URI we got from the bank.
   */
  talerWithdrawUri: string;

  /**
   * Reserve that was created for the withdraw URI.
   */
  reservePub: string;
}

/**
 * Status of recoup operations that were grouped together.
 *
 * The remaining amount of involved coins should be set to zero
 * in the same transaction that inserts the RecoupGroupRecord.
 */
export interface RecoupGroupRecord {
  /**
   * Unique identifier for the recoup group record.
   */
  recoupGroupId: string;

  exchangeBaseUrl: string;

  timestampStarted: TalerPreciseTimestamp;

  timestampFinished: TalerPreciseTimestamp | undefined;

  /**
   * Public keys that identify the coins being recouped
   * as part of this session.
   *
   * (Structured like this to enable multiEntry indexing in IndexedDB.)
   */
  coinPubs: string[];

  /**
   * Array of flags to indicate whether the recoup finished on each individual coin.
   */
  recoupFinishedPerCoin: boolean[];

  /**
   * Public keys of coins that should be scheduled for refreshing
   * after all individual recoups are done.
   */
  scheduleRefreshCoins: CoinRefreshRequest[];
}

export enum BackupProviderStateTag {
  Provisional = "provisional",
  Ready = "ready",
  Retrying = "retrying",
}

export type BackupProviderState =
  | {
      tag: BackupProviderStateTag.Provisional;
    }
  | {
      tag: BackupProviderStateTag.Ready;
      nextBackupTimestamp: TalerPreciseTimestamp;
    }
  | {
      tag: BackupProviderStateTag.Retrying;
    };

export interface BackupProviderTerms {
  supportedProtocolVersion: string;
  annualFee: AmountString;
  storageLimitInMegabytes: number;
}

export interface BackupProviderRecord {
  /**
   * Base URL of the provider.
   *
   * Primary key for the record.
   */
  baseUrl: string;

  /**
   * Name of the provider
   */
  name: string;

  /**
   * Terms of service of the provider.
   * Might be unavailable in the DB in certain situations
   * (such as loading a recovery document).
   */
  terms?: BackupProviderTerms;

  /**
   * Hash of the last encrypted backup that we already merged
   * or successfully uploaded ourselves.
   */
  lastBackupHash?: string;

  /**
   * Last time that we successfully uploaded a backup (or
   * the uploaded backup was already current).
   *
   * Does NOT correspond to the timestamp of the backup,
   * which only changes when the backup content changes.
   */
  lastBackupCycleTimestamp?: TalerPreciseTimestamp;

  /**
   * Proposal that we're currently trying to pay for.
   *
   * (Also included in paymentProposalIds.)
   *
   * FIXME:  Make this part of a proper BackupProviderState?
   */
  currentPaymentProposalId?: string;

  shouldRetryFreshProposal: boolean;

  /**
   * Proposals that were used to pay (or attempt to pay) the provider.
   *
   * Stored to display a history of payments to the provider, and
   * to make sure that the wallet isn't overpaying.
   */
  paymentProposalIds: string[];

  state: BackupProviderState;

  /**
   * UIDs for the operation that added the backup provider.
   */
  uids: string[];
}

export enum DepositOperationStatus {
  Pending = 10,
  Aborting = 11,

  Suspended = 20,
  SuspendedAborting = 21,

  Finished = 50,
  Failed = 51,
  Aborted = 52,
}

export interface DepositTrackingInfo {
  // Raw wire transfer identifier of the deposit.
  wireTransferId: string;
  // When was the wire transfer given to the bank.
  timestampExecuted: TalerProtocolTimestamp;
  // Total amount transfer for this wtid (including fees)
  amountRaw: AmountString;
  // Wire fee amount for this exchange
  wireFee: AmountString;

  exchangePub: string;
}

/**
 * Group of deposits made by the wallet.
 */
export interface DepositGroupRecord {
  depositGroupId: string;

  merchantPub: string;
  merchantPriv: string;

  noncePriv: string;
  noncePub: string;

  /**
   * Wire information used by all deposits in this
   * deposit group.
   */
  wire: {
    payto_uri: string;
    salt: string;
  };

  /**
   * Verbatim contract terms.
   */
  contractTermsRaw: MerchantContractTerms;

  contractTermsHash: string;

  payCoinSelection: PayCoinSelection;

  payCoinSelectionUid: string;

  totalPayCost: AmountString;

  /**
   * The counterparty effective deposit amount.
   *
   * FIXME: If possible, rename to counterpartyEffectiveDepositAmount.
   */
  effectiveDepositAmount: AmountString;

  timestampCreated: TalerPreciseTimestamp;

  timestampFinished: TalerPreciseTimestamp | undefined;

  operationStatus: DepositOperationStatus;

  // FIXME: Duplication between this and transactionPerCoin!
  depositedPerCoin: boolean[];

  // FIXME: Improve name!
  transactionPerCoin: DepositElementStatus[];

  /**
   * When the deposit transaction was aborted and
   * refreshes were tried, we create a refresh
   * group and store the ID here.
   */
  abortRefreshGroupId?: string;

  // FIXME: Do we need this and should it be in this object store?
  trackingState?: {
    [signature: string]: DepositTrackingInfo;
  };
}

/**
 * Record for a deposits that the wallet observed
 * as a result of double spending, but which is not
 * present in the wallet's own database otherwise.
 */
export interface GhostDepositGroupRecord {
  /**
   * When multiple deposits for the same contract terms hash
   * have a different timestamp, we choose the earliest one.
   */
  timestamp: TalerPreciseTimestamp;

  contractTermsHash: string;

  deposits: {
    coinPub: string;
    amount: AmountString;
    timestamp: TalerProtocolTimestamp;
    depositFee: AmountString;
    merchantPub: string;
    coinSig: string;
    wireHash: string;
  }[];
}

export interface TombstoneRecord {
  /**
   * Tombstone ID, with the syntax "tmb:<type>:<key>".
   */
  id: string;
}

export enum PeerPushPaymentInitiationStatus {
  /**
   * Initiated, but no purse created yet.
   */
  PendingCreatePurse = 10 /* ACTIVE_START */,
  PendingReady = 11,
  AbortingDeletePurse = 12,
  AbortingRefresh = 13,

  SuspendedCreatePurse = 30,
  SuspendedReady = 31,
  SuspendedAbortingDeletePurse = 32,
  SuspendedAbortingRefresh = 33,

  Done = 50 /* DORMANT_START */,
  Aborted = 51,
  Failed = 52,
}

export interface PeerPushPaymentCoinSelection {
  contributions: AmountString[];
  coinPubs: CoinPublicKeyString[];
}

/**
 * Record for a push P2P payment that this wallet initiated.
 */
export interface PeerPushPaymentInitiationRecord {
  /**
   * What exchange are funds coming from?
   */
  exchangeBaseUrl: string;

  /**
   * Instructed amount.
   */
  amount: AmountString;

  totalCost: AmountString;

  coinSel: PeerPushPaymentCoinSelection;

  contractTermsHash: HashCodeString;

  /**
   * Purse public key.  Used as the primary key to look
   * up this record.
   */
  pursePub: string;

  /**
   * Purse private key.
   */
  pursePriv: string;

  /**
   * Public key of the merge capability of the purse.
   */
  mergePub: string;

  /**
   * Private key of the merge capability of the purse.
   */
  mergePriv: string;

  contractPriv: string;
  contractPub: string;

  contractTerms: PeerContractTerms;

  purseExpiration: TalerProtocolTimestamp;

  timestampCreated: TalerPreciseTimestamp;

  /**
   * Status of the peer push payment initiation.
   */
  status: PeerPushPaymentInitiationStatus;
}

export enum PeerPullPaymentInitiationStatus {
  PendingCreatePurse = 10 /* ACTIVE_START */,
  /**
   * Purse created, waiting for the other party to accept the
   * invoice and deposit money into it.
   */
  PendingReady = 11 /* ACTIVE_START + 1 */,
  PendingMergeKycRequired = 12 /* ACTIVE_START + 2 */,
  PendingWithdrawing = 13,
  AbortingDeletePurse = 14,

  SuspendedCreatePurse = 30,
  SuspendedReady = 31,
  SuspendedMergeKycRequired = 32,
  SuspendedWithdrawing = 33,
  SuspendedAbortingDeletePurse = 34,

  DonePurseDeposited = 50 /* DORMANT_START */,
  Failed = 51,
  Aborted = 52,
}

export interface PeerPullPaymentInitiationRecord {
  /**
   * What exchange are we using for the payment request?
   */
  exchangeBaseUrl: string;

  /**
   * Amount requested.
   */
  amount: AmountString;

  estimatedAmountEffective: AmountString;

  /**
   * Purse public key.  Used as the primary key to look
   * up this record.
   */
  pursePub: string;

  /**
   * Purse private key.
   */
  pursePriv: string;

  /**
   * Hash of the contract terms.  Also
   * used to look up the contract terms in the DB.
   */
  contractTermsHash: string;

  mergePub: string;
  mergePriv: string;

  contractPub: string;
  contractPriv: string;

  contractTerms: PeerContractTerms;

  mergeTimestamp: TalerPreciseTimestamp;

  mergeReserveRowId: number;

  /**
   * Status of the peer pull payment initiation.
   */
  status: PeerPullPaymentInitiationStatus;

  kycInfo?: KycPendingInfo;

  withdrawalGroupId: string | undefined;
}

export enum PeerPushPaymentIncomingStatus {
  PendingMerge = 10 /* ACTIVE_START */,
  PendingMergeKycRequired = 11 /* ACTIVE_START + 1 */,
  /**
   * Merge was successful and withdrawal group has been created, now
   * everything is in the hand of the withdrawal group.
   */
  PendingWithdrawing = 12,

  SuspendedMerge = 20,
  SuspendedMergeKycRequired = 21,
  SuspendedWithdrawing = 22,

  DialogProposed = 30 /* USER_ATTENTION_START */,

  Done = 50 /* DORMANT_START */,
  Aborted = 51,
  Failed = 52,
}

/**
 * Record for a push P2P payment that this wallet was offered.
 *
 * Unique: (exchangeBaseUrl, pursePub)
 */
export interface PeerPushPaymentIncomingRecord {
  peerPushPaymentIncomingId: string;

  exchangeBaseUrl: string;

  pursePub: string;

  mergePriv: string;

  contractPriv: string;

  timestamp: TalerPreciseTimestamp;

  estimatedAmountEffective: AmountString;

  /**
   * Hash of the contract terms.  Also
   * used to look up the contract terms in the DB.
   */
  contractTermsHash: string;

  /**
   * Status of the peer push payment incoming initiation.
   */
  status: PeerPushPaymentIncomingStatus;

  /**
   * Associated withdrawal group.
   */
  withdrawalGroupId: string | undefined;

  /**
   * Currency of the peer push payment credit transaction.
   *
   * Mandatory in current schema version, optional for compatibility
   * with older (ver_minor<4) DB versions.
   */
  currency: string | undefined;

  kycInfo?: KycPendingInfo;
}

export enum PeerPullDebitRecordStatus {
  PendingDeposit = 10 /* ACTIVE_START */,
  AbortingRefresh = 11,

  SuspendedDeposit = 20,
  SuspendedAbortingRefresh = 21,

  DialogProposed = 30 /* USER_ATTENTION_START */,

  DonePaid = 50 /* DORMANT_START */,
  Aborted = 51,
  Failed = 52,
}

export interface PeerPullPaymentCoinSelection {
  contributions: AmountString[];
  coinPubs: CoinPublicKeyString[];

  /**
   * Total cost based on the coin selection.
   * Non undefined after status === "Accepted"
   */
  totalCost: AmountString | undefined;
}

/**
 * AKA PeerPullDebit.
 */
export interface PeerPullPaymentIncomingRecord {
  peerPullPaymentIncomingId: string;

  pursePub: string;

  exchangeBaseUrl: string;

  contractTerms: PeerContractTerms;

  timestampCreated: TalerPreciseTimestamp;

  /**
   * Contract priv that we got from the other party.
   */
  contractPriv: string;

  /**
   * Status of the peer push payment incoming initiation.
   */
  status: PeerPullDebitRecordStatus;

  /**
   * Estimated total cost when the record was created.
   */
  totalCostEstimated: AmountString;

  coinSel?: PeerPullPaymentCoinSelection;
}

/**
 * Store for extra information about a reserve.
 *
 * Mostly used to store the private key for a reserve and to allow
 * other records to reference the reserve key pair via a small row ID.
 *
 * In the future, we might also store KYC info about a reserve here.
 */
export interface ReserveRecord {
  rowId?: number;
  reservePub: string;
  reservePriv: string;
}

export interface OperationRetryRecord {
  /**
   * Unique identifier for the operation.  Typically of
   * the format `${opType}-${opUniqueKey}`
   *
   * @see {@link TaskIdentifiers}
   */
  id: string;

  lastError?: TalerErrorDetail;

  retryInfo: RetryInfo;
}

/**
 * Availability of coins of a given denomination (and age restriction!).
 *
 * We can't store this information with the denomination record, as one denomination
 * can be withdrawn with multiple age restrictions.
 */
export interface CoinAvailabilityRecord {
  currency: string;
  amountVal: number;
  amountFrac: number;
  denomPubHash: string;
  exchangeBaseUrl: string;

  /**
   * Age restriction on the coin, or 0 for no age restriction (or
   * denomination without age restriction support).
   */
  maxAge: number;

  /**
   * Number of fresh coins of this denomination that are available.
   */
  freshCoinCount: number;
}

export interface ContractTermsRecord {
  /**
   * Contract terms hash.
   */
  h: string;

  /**
   * Contract terms JSON.
   */
  contractTermsRaw: any;
}

export interface UserAttentionRecord {
  info: AttentionInfo;

  entityId: string;

  /**
   * When the notification was created.
   * FIXME: This should be a TalerPreciseTimestamp
   */
  createdMs: number;

  /**
   * When the user mark this notification as read.
   */
  read: TalerPreciseTimestamp | undefined;
}

export interface DbExchangeHandle {
  url: string;
  exchangeMasterPub: string;
}

export interface DbAuditorHandle {
  url: string;
  auditorPub: string;
}

// Work in progress for regional currencies
export interface CurrencySettingsRecord {
  currency: string;

  globalScopeExchanges: DbExchangeHandle[];

  globalScopeAuditors: DbAuditorHandle[];

  // Used to decide which auditor to show the currency under
  // when multiple auditors apply.
  auditorPriority: string[];

  // Later, we might add stuff related to how the currency is rendered.
}

export enum RefundGroupStatus {
  Pending = 10,
  Done = 50,
  Failed = 51,
  Aborted = 52,
}

/**
 * Metadata about a group of refunds with the merchant.
 */
export interface RefundGroupRecord {
  status: RefundGroupStatus;

  /**
   * Timestamp when the refund group was created.
   */
  timestampCreated: TalerPreciseTimestamp;

  proposalId: string;

  refundGroupId: string;

  refreshGroupId?: string;

  amountRaw: AmountString;

  /**
   * Estimated effective amount, based on
   * refund fees and refresh costs.
   */
  amountEffective: AmountString;
}

export enum RefundItemStatus {
  /**
   * Intermittent error that the merchant is
   * reporting from the exchange.
   *
   * We'll try again!
   */
  Pending = 10,
  /**
   * Refund was obtained successfully.
   */
  Done = 50,
  /**
   * Permanent error reported by the exchange
   * for the refund.
   */
  Failed = 51,
}

/**
 * Refund for a single coin in a payment with a merchant.
 */
export interface RefundItemRecord {
  /**
   * Auto-increment DB record ID.
   */
  id?: number;

  status: RefundItemStatus;

  refundGroupId: string;

  // Execution time as claimed by the merchant
  executionTime: TalerProtocolTimestamp;

  /**
   * Time when the wallet became aware of the refund.
   */
  obtainedTime: TalerPreciseTimestamp;

  refundAmount: AmountString;

  //refundFee: AmountString;

  /**
   * Upper bound on the refresh cost incurred by
   * applying this refund.
   *
   * Might be lower in practice when two refunds on the same
   * coin are refreshed in the same refresh operation.
   */
  //totalRefreshCostBound: AmountString;

  coinPub: string;

  rtxid: number;
}

/**
 * Schema definition for the IndexedDB
 * wallet database.
 */
export const WalletStoresV1 = {
  currencySettings: describeStore(
    "currencySettings",
    describeContents<CurrencySettingsRecord>({
      keyPath: ["currency"],
      versionAdded: 3,
    }),
    {},
  ),
  coinAvailability: describeStore(
    "coinAvailability",
    describeContents<CoinAvailabilityRecord>({
      keyPath: ["exchangeBaseUrl", "denomPubHash", "maxAge"],
    }),
    {
      byExchangeAgeAvailability: describeIndex("byExchangeAgeAvailability", [
        "exchangeBaseUrl",
        "maxAge",
        "freshCoinCount",
      ]),
    },
  ),
  coins: describeStore(
    "coins",
    describeContents<CoinRecord>({
      keyPath: "coinPub",
    }),
    {
      byBaseUrl: describeIndex("byBaseUrl", "exchangeBaseUrl"),
      byDenomPubHash: describeIndex("byDenomPubHash", "denomPubHash"),
      byExchangeDenomPubHashAndAgeAndStatus: describeIndex(
        "byExchangeDenomPubHashAndAgeAndStatus",
        ["exchangeBaseUrl", "denomPubHash", "maxAge", "status"],
      ),
      byCoinEvHash: describeIndex("byCoinEvHash", "coinEvHash"),
    },
  ),
  reserves: describeStore(
    "reserves",
    describeContents<ReserveRecord>({
      keyPath: "rowId",
      autoIncrement: true,
    }),
    {
      byReservePub: describeIndex("byReservePub", "reservePub", {}),
    },
  ),
  exchangeTos: describeStore(
    "exchangeTos",
    describeContents<ExchangeTosRecord>({
      keyPath: ["exchangeBaseUrl", "etag"],
    }),
    {},
  ),
  config: describeStore(
    "config",
    describeContents<ConfigRecord>({ keyPath: "key" }),
    {},
  ),
  auditorTrust: describeStore(
    "auditorTrust",
    describeContents<AuditorTrustRecord>({
      keyPath: ["currency", "auditorBaseUrl"],
    }),
    {
      byAuditorPub: describeIndex("byAuditorPub", "auditorPub"),
      byUid: describeIndex("byUid", "uids", {
        multiEntry: true,
      }),
    },
  ),
  exchangeTrust: describeStore(
    "exchangeTrust",
    describeContents<ExchangeTrustRecord>({
      keyPath: ["currency", "exchangeBaseUrl"],
    }),
    {
      byExchangeMasterPub: describeIndex(
        "byExchangeMasterPub",
        "exchangeMasterPub",
      ),
    },
  ),
  denominations: describeStore(
    "denominations",
    describeContents<DenominationRecord>({
      keyPath: ["exchangeBaseUrl", "denomPubHash"],
    }),
    {
      byExchangeBaseUrl: describeIndex("byExchangeBaseUrl", "exchangeBaseUrl"),
    },
  ),
  exchanges: describeStore(
    "exchanges",
    describeContents<ExchangeRecord>({
      keyPath: "baseUrl",
    }),
    {},
  ),
  exchangeDetails: describeStore(
    "exchangeDetails",
    describeContents<ExchangeDetailsRecord>({
      keyPath: "rowId",
      autoIncrement: true,
    }),
    {
      byPointer: describeIndex(
        "byDetailsPointer",
        ["exchangeBaseUrl", "currency", "masterPublicKey"],
        {
          unique: true,
        },
      ),
    },
  ),
  exchangeSignKeys: describeStore(
    "exchangeSignKeys",
    describeContents<ExchangeSignkeysRecord>({
      keyPath: ["exchangeDetailsRowId", "signkeyPub"],
    }),
    {
      byExchangeDetailsRowId: describeIndex("byExchangeDetailsRowId", [
        "exchangeDetailsRowId",
      ]),
    },
  ),
  refreshGroups: describeStore(
    "refreshGroups",
    describeContents<RefreshGroupRecord>({
      keyPath: "refreshGroupId",
    }),
    {
      byStatus: describeIndex("byStatus", "operationStatus"),
    },
  ),
  recoupGroups: describeStore(
    "recoupGroups",
    describeContents<RecoupGroupRecord>({
      keyPath: "recoupGroupId",
    }),
    {},
  ),
  purchases: describeStore(
    "purchases",
    describeContents<PurchaseRecord>({ keyPath: "proposalId" }),
    {
      byStatus: describeIndex("byStatus", "purchaseStatus"),
      byFulfillmentUrl: describeIndex(
        "byFulfillmentUrl",
        "download.fulfillmentUrl",
      ),
      byUrlAndOrderId: describeIndex("byUrlAndOrderId", [
        "merchantBaseUrl",
        "orderId",
      ]),
    },
  ),
  tips: describeStore(
    "tips",
    describeContents<TipRecord>({ keyPath: "walletTipId" }),
    {
      byMerchantTipIdAndBaseUrl: describeIndex("byMerchantTipIdAndBaseUrl", [
        "merchantTipId",
        "merchantBaseUrl",
      ]),
    },
  ),
  withdrawalGroups: describeStore(
    "withdrawalGroups",
    describeContents<WithdrawalGroupRecord>({
      keyPath: "withdrawalGroupId",
    }),
    {
      byStatus: describeIndex("byStatus", "status"),
      byTalerWithdrawUri: describeIndex(
        "byTalerWithdrawUri",
        "wgInfo.bankInfo.talerWithdrawUri",
      ),
    },
  ),
  planchets: describeStore(
    "planchets",
    describeContents<PlanchetRecord>({ keyPath: "coinPub" }),
    {
      byGroupAndIndex: describeIndex("byGroupAndIndex", [
        "withdrawalGroupId",
        "coinIdx",
      ]),
      byGroup: describeIndex("byGroup", "withdrawalGroupId"),
      byCoinEvHash: describeIndex("byCoinEv", "coinEvHash"),
    },
  ),
  bankWithdrawUris: describeStore(
    "bankWithdrawUris",
    describeContents<BankWithdrawUriRecord>({
      keyPath: "talerWithdrawUri",
    }),
    {},
  ),
  backupProviders: describeStore(
    "backupProviders",
    describeContents<BackupProviderRecord>({
      keyPath: "baseUrl",
    }),
    {
      byPaymentProposalId: describeIndex(
        "byPaymentProposalId",
        "paymentProposalIds",
        {
          multiEntry: true,
        },
      ),
    },
  ),
  depositGroups: describeStore(
    "depositGroups",
    describeContents<DepositGroupRecord>({
      keyPath: "depositGroupId",
    }),
    {
      byStatus: describeIndex("byStatus", "operationStatus"),
    },
  ),
  tombstones: describeStore(
    "tombstones",
    describeContents<TombstoneRecord>({ keyPath: "id" }),
    {},
  ),
  operationRetries: describeStore(
    "operationRetries",
    describeContents<OperationRetryRecord>({
      keyPath: "id",
    }),
    {},
  ),
  ghostDepositGroups: describeStore(
    "ghostDepositGroups",
    describeContents<GhostDepositGroupRecord>({
      keyPath: "contractTermsHash",
    }),
    {},
  ),
  peerPushPaymentIncoming: describeStore(
    "peerPushPaymentIncoming",
    describeContents<PeerPushPaymentIncomingRecord>({
      keyPath: "peerPushPaymentIncomingId",
    }),
    {
      byExchangeAndPurse: describeIndex("byExchangeAndPurse", [
        "exchangeBaseUrl",
        "pursePub",
      ]),
      byExchangeAndContractPriv: describeIndex(
        "byExchangeAndContractPriv",
        ["exchangeBaseUrl", "contractPriv"],
        {
          versionAdded: 5,
          unique: true,
        },
      ),
      byWithdrawalGroupId: describeIndex(
        "byWithdrawalGroupId",
        "withdrawalGroupId",
        {
          versionAdded: 5,
        },
      ),
      byStatus: describeIndex("byStatus", "status"),
    },
  ),
  peerPullPaymentIncoming: describeStore(
    "peerPullPaymentIncoming",
    describeContents<PeerPullPaymentIncomingRecord>({
      keyPath: "peerPullPaymentIncomingId",
    }),
    {
      byExchangeAndPurse: describeIndex("byExchangeAndPurse", [
        "exchangeBaseUrl",
        "pursePub",
      ]),
      byExchangeAndContractPriv: describeIndex(
        "byExchangeAndContractPriv",
        ["exchangeBaseUrl", "contractPriv"],
        {
          versionAdded: 5,
          unique: true,
        },
      ),
      byStatus: describeIndex("byStatus", "status"),
    },
  ),
  peerPullPaymentInitiations: describeStore(
    "peerPullPaymentInitiations",
    describeContents<PeerPullPaymentInitiationRecord>({
      keyPath: "pursePub",
    }),
    {
      byStatus: describeIndex("byStatus", "status"),
      byWithdrawalGroupId: describeIndex(
        "byWithdrawalGroupId",
        "withdrawalGroupId",
        {
          versionAdded: 5,
        },
      ),
    },
  ),
  peerPushPaymentInitiations: describeStore(
    "peerPushPaymentInitiations",
    describeContents<PeerPushPaymentInitiationRecord>({
      keyPath: "pursePub",
    }),
    {
      byStatus: describeIndex("byStatus", "status"),
    },
  ),
  bankAccounts: describeStore(
    "bankAccounts",
    describeContents<BankAccountsRecord>({
      keyPath: "uri",
    }),
    {},
  ),
  contractTerms: describeStore(
    "contractTerms",
    describeContents<ContractTermsRecord>({
      keyPath: "h",
    }),
    {},
  ),
  userAttention: describeStore(
    "userAttention",
    describeContents<UserAttentionRecord>({
      keyPath: ["entityId", "info.type"],
      versionAdded: 2,
    }),
    {},
  ),
  refundGroups: describeStore(
    "refundGroups",
    describeContents<RefundGroupRecord>({
      keyPath: "refundGroupId",
      versionAdded: 7,
    }),
    {
      byProposalId: describeIndex("byProposalId", "proposalId"),
    },
  ),
  refundItems: describeStore(
    "refundItems",
    describeContents<RefundItemRecord>({
      keyPath: "id",
      versionAdded: 7,
      autoIncrement: true,
    }),
    {
      byCoinPubAndRtxid: describeIndex("byCoinPubAndRtxid", [
        "coinPub",
        "rtxid",
      ]),
      byRefundGroupId: describeIndex("byRefundGroupId", ["refundGroupId"]),
    },
  ),
  fixups: describeStore(
    "fixups",
    describeContents<FixupRecord>({
      keyPath: "fixupName",
      versionAdded: 2,
    }),
    {},
  ),
};

/**
 * An applied migration.
 */
export interface FixupRecord {
  fixupName: string;
}

/**
 * User accounts
 */
export interface BankAccountsRecord {
  uri: string;
  currency: string;
  kycCompleted: boolean;
  alias: string;
}

export interface MetaConfigRecord {
  key: string;
  value: any;
}

export const walletMetadataStore = {
  metaConfig: describeStore(
    "metaConfig",
    describeContents<MetaConfigRecord>({ keyPath: "key" }),
    {},
  ),
};

export function exportDb(db: IDBDatabase): Promise<any> {
  const dump = {
    name: db.name,
    stores: {} as { [s: string]: any },
    version: db.version,
  };

  return new Promise((resolve, reject) => {
    const tx = db.transaction(Array.from(db.objectStoreNames));
    tx.addEventListener("complete", () => {
      resolve(dump);
    });
    // tslint:disable-next-line:prefer-for-of
    for (let i = 0; i < db.objectStoreNames.length; i++) {
      const name = db.objectStoreNames[i];
      const storeDump = {} as { [s: string]: any };
      dump.stores[name] = storeDump;
      tx.objectStore(name)
        .openCursor()
        .addEventListener("success", (e: Event) => {
          const cursor = (e.target as any).result;
          if (cursor) {
            storeDump[cursor.key] = cursor.value;
            cursor.continue();
          }
        });
    }
  });
}

export interface DatabaseDump {
  name: string;
  stores: { [s: string]: any };
  version: string;
}

async function recoverFromDump(
  db: IDBDatabase,
  dump: DatabaseDump,
): Promise<void> {
  return new Promise((resolve, reject) => {
    const tx = db.transaction(Array.from(db.objectStoreNames), "readwrite");
    tx.addEventListener("complete", () => {
      resolve();
    });
    for (let i = 0; i < db.objectStoreNames.length; i++) {
      const name = db.objectStoreNames[i];
      const storeDump = dump.stores[name];
      if (!storeDump) continue;
      Object.keys(storeDump).forEach(async (key) => {
        const value = storeDump[key];
        if (!value) return;
        tx.objectStore(name).put(value);
      });
    }
    tx.commit();
  });
}

export async function importDb(db: IDBDatabase, object: any): Promise<void> {
  if ("name" in object && "stores" in object && "version" in object) {
    // looks like a database dump
    const dump = object as DatabaseDump;
    return recoverFromDump(db, dump);
  }

  if ("databases" in object && "$types" in object) {
    // looks like a IDBDatabase
    const someDatabase = object.databases;

    if (TALER_META_DB_NAME in someDatabase) {
      //looks like a taler database
      const currentMainDbValue =
        someDatabase[TALER_META_DB_NAME].objectStores.metaConfig.records[0]
          .value.value;

      if (currentMainDbValue !== TALER_DB_NAME) {
        console.log("not the current database version");
      }

      const talerDb = someDatabase[currentMainDbValue];

      const objectStoreNames = Object.keys(talerDb.objectStores);

      const dump: DatabaseDump = {
        name: talerDb.schema.databaseName,
        version: talerDb.schema.databaseVersion,
        stores: {},
      };

      for (let i = 0; i < objectStoreNames.length; i++) {
        const name = objectStoreNames[i];
        const storeDump = {} as { [s: string]: any };
        dump.stores[name] = storeDump;
        talerDb.objectStores[name].records.map((r: any) => {
          const pkey = r.primaryKey;
          const key =
            typeof pkey === "string" || typeof pkey === "number"
              ? pkey
              : pkey.join(",");
          storeDump[key] = r.value;
        });
      }

      return recoverFromDump(db, dump);
    }
  }
  throw Error("could not import database");
}

export interface FixupDescription {
  name: string;
  fn(tx: GetReadWriteAccess<typeof WalletStoresV1>): Promise<void>;
}

/**
 * Manual migrations between minor versions of the DB schema.
 */
export const walletDbFixups: FixupDescription[] = [
  {
    name: "RefreshGroupRecord_currency",
    async fn(tx): Promise<void> {
      await tx.refreshGroups.iter().forEachAsync(async (rg) => {
        if (rg.currency) {
          return;
        }
        // Empty refresh group without input coin, delete it!
        if (rg.inputPerCoin.length === 0) {
          await tx.refreshGroups.delete(rg.refreshGroupId);
          return;
        }
        rg.currency = Amounts.parseOrThrow(rg.inputPerCoin[0]).currency;
        await tx.refreshGroups.put(rg);
      });
    },
  },
  {
    name: "DepositGroupRecord_transactionPerCoin",
    async fn(tx): Promise<void> {
      await tx.depositGroups.iter().forEachAsync(async (dg) => {
        if (dg.transactionPerCoin) {
          return;
        }
        dg.transactionPerCoin = dg.depositedPerCoin.map(
          (c) => DepositElementStatus.Unknown,
        );
        await tx.depositGroups.put(dg);
      });
    },
  },
  {
    name: "PeerPullPaymentIncomingRecord_totalCostEstimated_add",
    async fn(tx): Promise<void> {
      await tx.peerPullPaymentIncoming.iter().forEachAsync(async (pi) => {
        if (pi.totalCostEstimated) {
          return;
        }
        // Not really the cost, but a good substitute for older transactions
        // that don't sture the effective cost of the transaction.
        pi.totalCostEstimated = pi.contractTerms.amount;
        await tx.peerPullPaymentIncoming.put(pi);
      });
    },
  },
  {
    name: "PeerPushPaymentIncomingRecord_totalCostEstimated_add",
    async fn(tx): Promise<void> {
      await tx.peerPushPaymentIncoming.iter().forEachAsync(async (pi) => {
        if (pi.estimatedAmountEffective) {
          return;
        }
        const contractTerms = await tx.contractTerms.get(pi.contractTermsHash);
        if (!contractTerms) {
          // Not sure what we can do here!
        } else {
          // Not really the cost, but a good substitute for older transactions
          // that don't sture the effective cost of the transaction.
          pi.estimatedAmountEffective = contractTerms.contractTermsRaw.amount;
          await tx.peerPushPaymentIncoming.put(pi);
        }
      });
    },
  },
  {
    name: "PeerPullPaymentInitiationRecord_estimatedAmountEffective_add",
    async fn(tx): Promise<void> {
      await tx.peerPullPaymentInitiations.iter().forEachAsync(async (pi) => {
        if (pi.estimatedAmountEffective) {
          return;
        }
        pi.estimatedAmountEffective = pi.amount;
        await tx.peerPullPaymentInitiations.put(pi);
      });
    },
  },
  {
    name: "PeerPushPaymentInitiationRecord_ALL_removeLegacyTx",
    async fn(tx): Promise<void> {
      await tx.peerPushPaymentInitiations.iter().forEachAsync(async (pi) => {
        // Remove legacy transactions that don't have the totalCost field yet.
        if (!pi.totalCost) {
          await tx.peerPushPaymentInitiations.delete(pi.pursePub);
        }
      });
    },
  },
  {
    name: "TipRecordRecord_status_add",
    async fn(tx): Promise<void> {
      await tx.tips.iter().forEachAsync(async (r) => {
        // Remove legacy transactions that don't have the totalCost field yet.
        if (r.status == null) {
          if (r.pickedUpTimestamp) {
            r.status = TipRecordStatus.Done;
          } else {
            r.status = TipRecordStatus.PendingPickup;
          }
          await tx.tips.put(r);
        }
      });
    },
  },
];

const logger = new Logger("db.ts");

export async function applyFixups(
  db: DbAccess<typeof WalletStoresV1>,
): Promise<void> {
  logger.trace("applying fixups");
  await db.mktxAll().runReadWrite(async (tx) => {
    for (const fixupInstruction of walletDbFixups) {
      logger.trace(`checking fixup ${fixupInstruction.name}`);
      const fixupRecord = await tx.fixups.get(fixupInstruction.name);
      if (fixupRecord) {
        continue;
      }
      logger.info(`applying DB fixup ${fixupInstruction.name}`);
      await fixupInstruction.fn(tx);
      await tx.fixups.put({
        fixupName: fixupInstruction.name,
      });
    }
  });
}

/**
 * Upgrade an IndexedDB in an upgrade transaction.
 *
 * The upgrade is made based on a store map, i.e. the metadata
 * structure that describes all the object stores and indexes.
 */
function upgradeFromStoreMap(
  storeMap: any, // FIXME: nail down type
  db: IDBDatabase,
  oldVersion: number,
  newVersion: number,
  upgradeTransaction: IDBTransaction,
): void {
  if (oldVersion === 0) {
    for (const n in storeMap) {
      const swi: StoreWithIndexes<
        any,
        StoreDescriptor<unknown>,
        any
      > = storeMap[n];
      const storeDesc: StoreDescriptor<unknown> = swi.store;
      const s = db.createObjectStore(swi.storeName, {
        autoIncrement: storeDesc.autoIncrement,
        keyPath: storeDesc.keyPath,
      });
      for (const indexName in swi.indexMap as any) {
        const indexDesc: IndexDescriptor = swi.indexMap[indexName];
        s.createIndex(indexDesc.name, indexDesc.keyPath, {
          multiEntry: indexDesc.multiEntry,
          unique: indexDesc.unique,
        });
      }
    }
    return;
  }
  if (oldVersion === newVersion) {
    return;
  }
  logger.info(`upgrading database from ${oldVersion} to ${newVersion}`);
  for (const n in storeMap) {
    const swi: StoreWithIndexes<any, StoreDescriptor<unknown>, any> = storeMap[
      n
    ];
    const storeDesc: StoreDescriptor<unknown> = swi.store;
    const storeAddedVersion = storeDesc.versionAdded ?? 0;
    let s: IDBObjectStore;
    if (storeAddedVersion > oldVersion) {
      // Be tolerant if object store already exists.
      // Probably means somebody deployed without
      // adding the "addedInVersion" attribute.
      if (!upgradeTransaction.objectStoreNames.contains(swi.storeName)) {
        try {
          s = db.createObjectStore(swi.storeName, {
            autoIncrement: storeDesc.autoIncrement,
            keyPath: storeDesc.keyPath,
          });
        } catch (e) {
          const moreInfo = e instanceof Error ? ` Reason: ${e.message}` : "";
          throw Error(
            `Migration failed. Could not create store ${swi.storeName}.${moreInfo}`,
          );
        }
      }
    }

    s = upgradeTransaction.objectStore(swi.storeName);

    for (const indexName in swi.indexMap as any) {
      const indexDesc: IndexDescriptor = swi.indexMap[indexName];
      const indexAddedVersion = indexDesc.versionAdded ?? 0;
      if (indexAddedVersion <= oldVersion) {
        continue;
      }
      // Be tolerant if index already exists.
      // Probably means somebody deployed without
      // adding the "addedInVersion" attribute.
      if (!s.indexNames.contains(indexDesc.name)) {
        try {
          s.createIndex(indexDesc.name, indexDesc.keyPath, {
            multiEntry: indexDesc.multiEntry,
            unique: indexDesc.unique,
          });
        } catch (e) {
          const moreInfo = e instanceof Error ? ` Reason: ${e.message}` : "";
          throw Error(
            `Migration failed. Could not create index ${indexDesc.name}/${indexDesc.keyPath}. ${moreInfo}`,
          );
        }
      }
    }
  }
}

function promiseFromTransaction(transaction: IDBTransaction): Promise<void> {
  return new Promise<void>((resolve, reject) => {
    transaction.oncomplete = () => {
      resolve();
    };
    transaction.onerror = () => {
      reject();
    };
  });
}

/**
 * Purge all data in the given database.
 */
export function clearDatabase(db: IDBDatabase): Promise<void> {
  // db.objectStoreNames is a DOMStringList, so we need to convert
  let stores: string[] = [];
  for (let i = 0; i < db.objectStoreNames.length; i++) {
    stores.push(db.objectStoreNames[i]);
  }
  const tx = db.transaction(stores, "readwrite");
  for (const store of stores) {
    tx.objectStore(store).clear();
  }
  return promiseFromTransaction(tx);
}

function onTalerDbUpgradeNeeded(
  db: IDBDatabase,
  oldVersion: number,
  newVersion: number,
  upgradeTransaction: IDBTransaction,
) {
  upgradeFromStoreMap(
    WalletStoresV1,
    db,
    oldVersion,
    newVersion,
    upgradeTransaction,
  );
}

function onMetaDbUpgradeNeeded(
  db: IDBDatabase,
  oldVersion: number,
  newVersion: number,
  upgradeTransaction: IDBTransaction,
) {
  upgradeFromStoreMap(
    walletMetadataStore,
    db,
    oldVersion,
    newVersion,
    upgradeTransaction,
  );
}

/**
 * Return a promise that resolves
 * to the taler wallet db.
 *
 * @param onVersionChange Called when another client concurrenctly connects to the database
 * with a higher version.
 */
export async function openTalerDatabase(
  idbFactory: IDBFactory,
  onVersionChange: () => void,
): Promise<DbAccess<typeof WalletStoresV1>> {
  const metaDbHandle = await openDatabase(
    idbFactory,
    TALER_META_DB_NAME,
    1,
    () => {},
    onMetaDbUpgradeNeeded,
  );

  const metaDb = new DbAccess(metaDbHandle, walletMetadataStore);
  let currentMainVersion: string | undefined;
  await metaDb
    .mktx((stores) => [stores.metaConfig])
    .runReadWrite(async (tx) => {
      const dbVersionRecord = await tx.metaConfig.get(CURRENT_DB_CONFIG_KEY);
      if (!dbVersionRecord) {
        currentMainVersion = TALER_DB_NAME;
        await tx.metaConfig.put({
          key: CURRENT_DB_CONFIG_KEY,
          value: TALER_DB_NAME,
        });
      } else {
        currentMainVersion = dbVersionRecord.value;
      }
    });

  if (currentMainVersion !== TALER_DB_NAME) {
    switch (currentMainVersion) {
      case "taler-wallet-main-v2":
      case "taler-wallet-main-v3":
      case "taler-wallet-main-v4": // temporary, we might migrate v4 later
      case "taler-wallet-main-v5":
      case "taler-wallet-main-v6":
      case "taler-wallet-main-v7":
      case "taler-wallet-main-v8":
        // We consider this a pre-release
        // development version, no migration is done.
        await metaDb
          .mktx((stores) => [stores.metaConfig])
          .runReadWrite(async (tx) => {
            await tx.metaConfig.put({
              key: CURRENT_DB_CONFIG_KEY,
              value: TALER_DB_NAME,
            });
          });
        break;
      default:
        throw Error(
          `major migration from database major=${currentMainVersion} not supported`,
        );
    }
  }

  const mainDbHandle = await openDatabase(
    idbFactory,
    TALER_DB_NAME,
    WALLET_DB_MINOR_VERSION,
    onVersionChange,
    onTalerDbUpgradeNeeded,
  );

  const handle = new DbAccess(mainDbHandle, WalletStoresV1);

  await applyFixups(handle);

  return handle;
}

export async function deleteTalerDatabase(
  idbFactory: IDBFactory,
): Promise<void> {
  return new Promise((resolve, reject) => {
    const req = idbFactory.deleteDatabase(TALER_DB_NAME);
    req.onerror = () => reject(req.error);
    req.onsuccess = () => resolve();
  });
}