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

/*
 This file is part of GNU Taler
 (C) 2021 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 {
  openDatabase,
  describeStore,
  describeContents,
  describeIndex,
  DbAccess,
  StoreDescriptor,
  StoreWithIndexes,
  IndexDescriptor,
} from "./util/query";
import { IDBFactory, IDBDatabase, IDBTransaction } from "@gnu-taler/idb-bridge";
import { Logger } from "@gnu-taler/taler-util";
import {
  AmountJson,
  AmountString,
  Auditor,
  CoinDepositPermission,
  ContractTerms,
  Duration,
  ExchangeSignKeyJson,
  InternationalizedString,
  MerchantInfo,
  Product,
  RefreshReason,
  TalerErrorDetails,
  Timestamp,
} from "@gnu-taler/taler-util";
import { RetryInfo } from "./util/retries.js";
import { PayCoinSelection } from "./util/coinSelection.js";

/**
 * 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.
 */
const TALER_DB_NAME = "taler-wallet-main-v2";

const TALER_META_DB_NAME = "taler-wallet-meta";

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 = 1;

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

function upgradeFromStoreMap(
  storeMap: any,
  db: IDBDatabase,
  oldVersion: number,
  newVersion: number,
  upgradeTransaction: IDBTransaction,
): void {
  if (oldVersion === 0) {
    for (const n in storeMap) {
      const swi: StoreWithIndexes<StoreDescriptor<unknown>, any> = storeMap[n];
      const storeDesc: StoreDescriptor<unknown> = swi.store;
      const s = db.createObjectStore(storeDesc.name, {
        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,
        });
      }
    }
    return;
  }
  if (oldVersion === newVersion) {
    return;
  }
  logger.info(`upgrading database from ${oldVersion} to ${newVersion}`);
  throw Error("upgrade not supported");
}

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.
 */
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((x) => ({
      metaConfig: x.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) {
    // In the future, the migration logic will be implemented here.
    throw Error(`migration from database ${currentMainVersion} not supported`);
  }

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

  return new DbAccess(mainDbHandle, WalletStoresV1);
}

export function deleteTalerDatabase(idbFactory: IDBFactory): void {
  idbFactory.deleteDatabase(TALER_DB_NAME);
}

export enum ReserveRecordStatus {
  /**
   * Reserve must be registered with the bank.
   */
  REGISTERING_BANK = "registering-bank",

  /**
   * 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).
   */
  WAIT_CONFIRM_BANK = "wait-confirm-bank",

  /**
   * Querying reserve status with the exchange.
   */
  QUERYING_STATUS = "querying-status",

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

  /**
   * The bank aborted the withdrawal.
   */
  BANK_ABORTED = "bank-aborted",
}

export interface ReserveBankInfo {
  /**
   * Status URL that the wallet will use to query the status
   * of the Taler withdrawal operation on the bank's side.
   */
  statusUrl: string;

  confirmUrl?: string;

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

/**
 * A reserve record as stored in the wallet's database.
 */
export interface ReserveRecord {
  /**
   * The reserve public key.
   */
  reservePub: string;

  /**
   * The reserve private key.
   */
  reservePriv: string;

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

  /**
   * Currency of the reserve.
   */
  currency: string;

  /**
   * Time when the reserve was created.
   */
  timestampCreated: Timestamp;

  /**
   * Time when the information about this reserve was posted to the bank.
   *
   * Only applies if bankWithdrawStatusUrl is defined.
   *
   * Set to 0 if that hasn't happened yet.
   */
  timestampReserveInfoPosted: Timestamp | undefined;

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

  /**
   * Wire information (as payto URI) for the bank account that
   * transferred funds for this reserve.
   */
  senderWire?: string;

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

  /**
   * Extra state for when this is a withdrawal involving
   * a Taler-integrated bank.
   */
  bankInfo?: ReserveBankInfo;

  initialWithdrawalGroupId: string;

  /**
   * Did we start the first withdrawal for this reserve?
   *
   * We only report a pending withdrawal for the reserve before
   * the first withdrawal has started.
   */
  initialWithdrawalStarted: boolean;

  /**
   * Initial denomination selection, stored here so that
   * we can show this information in the transactions/balances
   * before we have a withdrawal group.
   */
  initialDenomSel: DenomSelectionState;

  reserveStatus: ReserveRecordStatus;

  /**
   * Was a reserve query requested?  If so, query again instead
   * of going into dormant status.
   */
  requestedQuery: boolean;

  /**
   * Time of the last successful status query.
   */
  lastSuccessfulStatusQuery: Timestamp | undefined;

  /**
   * Retry info.  This field is present even if no retry is scheduled,
   * because we need it to be present for the index on the object store
   * to work.
   */
  retryInfo: RetryInfo;

  /**
   * Last error that happened in a reserve operation
   * (either talking to the bank or the exchange).
   */
  lastError: TalerErrorDetails | undefined;
}

/**
 * Auditor record as stored with currencies in the exchange database.
 */
export interface AuditorRecord {
  /**
   * Base url of the auditor.
   */
  baseUrl: string;

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

  /**
   * Time when the auditing expires.
   */
  expirationStamp: number;
}

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.
   */
  uids: string[];
}

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 DenominationStatus {
  /**
   * Verification was delayed.
   */
  Unverified = "unverified",
  /**
   * Verified as valid.
   */
  VerifiedGood = "verified-good",
  /**
   * Verified as invalid.
   */
  VerifiedBad = "verified-bad",
}

/**
 * Denomination record as stored in the wallet's database.
 */
export interface DenominationRecord {
  /**
   * Value of one coin of the denomination.
   */
  value: AmountJson;

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

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

  /**
   * Fee for withdrawing.
   */
  feeWithdraw: AmountJson;

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

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

  /**
   * Fee for refunding.
   */
  feeRefund: AmountJson;

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

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

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

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

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

  /**
   * Did we verify the signature on the denomination?
   *
   * FIXME:  Rename to "verificationStatus"?
   */
  status: DenominationStatus;

  /**
   * 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;
}

export interface ExchangeBankAccount {
  payto_uri: string;
  master_sig: string;
}

export interface ExchangeDetailsRecord {
  /**
   * Master public key of the exchange.
   */
  masterPublicKey: string;

  exchangeBaseUrl: string;

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

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

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

  reserveClosingDelay: Duration;

  /**
   * Signing keys we got from the exchange, can also contain
   * older signing keys that are not returned by /keys anymore.
   */
  signingKeys: ExchangeSignKeyJson[];

  /**
   * 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;

  /**
   * ETag for last terms of service download.
   */
  termsOfServiceLastEtag: string | undefined;

  /**
   * ETag for last terms of service download.
   */
  termsOfServiceAcceptedEtag: string | undefined;

  wireInfo: WireInfo;
}

export interface WireInfo {
  feesForType: { [wireMethod: string]: WireFee[] };

  accounts: ExchangeBankAccount[];
}

export interface ExchangeDetailsPointer {
  masterPublicKey: string;
  currency: string;

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

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

  detailsPointer: ExchangeDetailsPointer | undefined;

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

  /**
   * Last time when the exchange was updated.
   */
  lastUpdate: Timestamp | undefined;

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

  /**
   * 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: Timestamp;

  lastError?: TalerErrorDetails;

  /**
   * Retry status for fetching updated information about the exchange.
   */
  retryInfo: RetryInfo;
}

/**
 * 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;

  withdrawalDone: boolean;

  lastError: TalerErrorDetails | undefined;

  /**
   * Public key of the reserve that this planchet
   * is being withdrawn from.
   *
   * Can be the empty string (non-null/undefined for DB indexing)
   * if this is a tipping reserve.
   */
  reservePub: string;

  denomPubHash: string;

  denomPub: string;

  blindingKey: string;

  withdrawSig: string;

  coinEv: string;

  coinEvHash: string;

  coinValue: AmountJson;

  isFromTip: boolean;
}

/**
 * Planchet for a coin during refrehs.
 */
export interface RefreshPlanchet {
  /**
   * Public key for the coin.
   */
  publicKey: string;

  /**
   * Private key for the coin.
   */
  privateKey: string;

  /**
   * Blinded public key.
   */
  coinEv: string;

  coinEvHash: string;

  /**
   * Blinding key used.
   */
  blindingKey: string;
}

/**
 * Status of a coin.
 */
export enum CoinStatus {
  /**
   * Withdrawn and never shown to anybody.
   */
  Fresh = "fresh",
  /**
   * A coin that has been spent and refreshed.
   */
  Dormant = "dormant",
}

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;
  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;

  /**
   * Key used by the exchange used to sign the coin.
   */
  denomPub: string;

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

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

  /**
   * Amount that's left on the coin.
   */
  currentAmount: AmountJson;

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

  /**
   * The coin is currently suspended, and will not be used for payments.
   */
  suspended: boolean;

  /**
   * 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;
}

export enum ProposalStatus {
  /**
   * Not downloaded yet.
   */
  DOWNLOADING = "downloading",
  /**
   * Proposal downloaded, but the user needs to accept/reject it.
   */
  PROPOSED = "proposed",
  /**
   * The user has accepted the proposal.
   */
  ACCEPTED = "accepted",
  /**
   * The user has rejected the proposal.
   */
  REFUSED = "refused",
  /**
   * Downloading or processing the proposal has failed permanently.
   */
  PERMANENTLY_FAILED = "permanently-failed",
  /**
   * Downloaded proposal was detected as a re-purchase.
   */
  REPURCHASE = "repurchase",
}

export interface ProposalDownload {
  /**
   * The contract that was offered by the merchant.
   */
  contractTermsRaw: any;

  contractData: WalletContractData;
}

/**
 * Record for a downloaded order, stored in the wallet's database.
 */
export interface ProposalRecord {
  orderId: string;

  merchantBaseUrl: string;

  /**
   * Downloaded data from the merchant.
   */
  download: ProposalDownload | undefined;

  /**
   * Unique ID when the order is stored in the wallet DB.
   */
  proposalId: string;

  /**
   * Timestamp (in ms) of when the record
   * was created.
   */
  timestamp: Timestamp;

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

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

  claimToken: string | undefined;

  proposalStatus: ProposalStatus;

  repurchaseProposalId: string | undefined;

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

  /**
   * Retry info, even present when the operation isn't active to allow indexing
   * on the next retry timestamp.
   */
  retryInfo?: RetryInfo;

  lastError: TalerErrorDetails | undefined;
}

/**
 * Status of a tip we got from a merchant.
 */
export interface TipRecord {
  lastError: TalerErrorDetails | undefined;

  /**
   * Has the user accepted the tip?  Only after the tip has been accepted coins
   * withdrawn from the tip may be used.
   */
  acceptedTimestamp: Timestamp | undefined;

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

  tipAmountEffective: AmountJson;

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

  /**
   * 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.
   */
  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: Timestamp;

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

  /**
   * Retry info, even present when the operation isn't active to allow indexing
   * on the next retry timestamp.
   */
  retryInfo: RetryInfo;
}

export interface RefreshGroupRecord {
  /**
   * Retry info, even present when the operation isn't active to allow indexing
   * on the next retry timestamp.
   */
  retryInfo: RetryInfo;

  lastError: TalerErrorDetails | undefined;

  lastErrorPerCoin: { [coinIndex: number]: TalerErrorDetails };

  refreshGroupId: string;

  reason: RefreshReason;

  oldCoinPubs: string[];

  refreshSessionPerCoin: (RefreshSessionRecord | undefined)[];

  inputPerCoin: AmountJson[];

  estimatedOutputPerCoin: AmountJson[];

  /**
   * 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.
   */
  finishedPerCoin: boolean[];

  timestampCreated: Timestamp;

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

/**
 * Ongoing refresh
 */
export interface RefreshSessionRecord {
  /**
   * 512-bit secret that can be used to derive
   * the other cryptographic material for the refresh session.
   *
   * FIXME:  We currently store the derived material, but
   * should always derive it.
   */
  sessionSecretSeed: string;

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

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

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

/**
 * Wire fee for one wire method as stored in the
 * wallet's database.
 */
export interface WireFee {
  /**
   * Fee for wire transfers.
   */
  wireFee: AmountJson;

  /**
   * Fees to close and refund a reserve.
   */
  closingFee: AmountJson;

  /**
   * Start date of the fee.
   */
  startStamp: Timestamp;

  /**
   * End date of the fee.
   */
  endStamp: Timestamp;

  /**
   * Signature made by the exchange master key.
   */
  sig: string;
}

/**
 * Record to store information about a refund event.
 *
 * All information about a refund is stored with the purchase,
 * this event is just for the history.
 *
 * The event is only present for completed refunds.
 */
export interface RefundEventRecord {
  timestamp: Timestamp;
  merchantExecutionTimestamp: Timestamp;
  refundGroupId: string;
  proposalId: string;
}

export enum RefundState {
  Failed = "failed",
  Applied = "applied",
  Pending = "pending",
}

/**
 * State of one refund from the merchant, maintained by the wallet.
 */
export type WalletRefundItem =
  | WalletRefundFailedItem
  | WalletRefundPendingItem
  | WalletRefundAppliedItem;

export interface WalletRefundItemCommon {
  // Execution time as claimed by the merchant
  executionTime: Timestamp;

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

  refundAmount: AmountJson;

  refundFee: AmountJson;

  /**
   * 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: AmountJson;

  coinPub: string;

  rtransactionId: number;
}

/**
 * Failed refund, either because the merchant did
 * something wrong or it expired.
 */
export interface WalletRefundFailedItem extends WalletRefundItemCommon {
  type: RefundState.Failed;
}

export interface WalletRefundPendingItem extends WalletRefundItemCommon {
  type: RefundState.Pending;
}

export interface WalletRefundAppliedItem extends WalletRefundItemCommon {
  type: RefundState.Applied;
}

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: AmountJson;
  orderId: string;
  merchantBaseUrl: string;
  summary: string;
  autoRefund: Duration | undefined;
  maxWireFee: AmountJson;
  wireFeeAmortization: number;
  payDeadline: Timestamp;
  refundDeadline: Timestamp;
  allowedAuditors: AllowedAuditorInfo[];
  allowedExchanges: AllowedExchangeInfo[];
  timestamp: Timestamp;
  wireMethod: string;
  wireInfoHash: string;
  maxDepositFee: AmountJson;
}

export enum AbortStatus {
  None = "none",
  AbortRefund = "abort-refund",
  AbortFinished = "abort-finished",
}

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

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

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

  /**
   * Downloaded and parsed proposal data.
   */
  download: ProposalDownload;

  /**
   * Deposit permissions, available once the user has accepted the payment.
   *
   * This value is cached and derived from payCoinSelection.
   */
  coinDepositPermissions: CoinDepositPermission[] | undefined;

  payCoinSelection: PayCoinSelection;

  payCoinSelectionUid: string;

  /**
   * 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[];

  totalPayCost: AmountJson;

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

  merchantPaySig: string | undefined;

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

  /**
   * Pending refunds for the purchase.  A refund is pending
   * when the merchant reports a transient error from the exchange.
   */
  refunds: { [refundKey: string]: WalletRefundItem };

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

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

  /**
   * Set for the first payment, or on re-plays.
   */
  paymentSubmitPending: boolean;

  /**
   * Do we need to query the merchant for the refund status
   * of the payment?
   */
  refundQueryRequested: boolean;

  abortStatus: AbortStatus;

  payRetryInfo?: RetryInfo;

  lastPayError: TalerErrorDetails | undefined;

  /**
   * Retry information for querying the refund status with the merchant.
   */
  refundStatusRetryInfo: RetryInfo;

  /**
   * Last error (or undefined) for querying the refund status with the merchant.
   */
  lastRefundStatusError: TalerErrorDetails | undefined;

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

/**
 * Configuration key/value entries to configure
 * the wallet.
 */
export interface ConfigRecord<T> {
  key: string;
  value: T;
}

/**
 * FIXME: Eliminate this in favor of DenomSelectionState.
 */
export interface DenominationSelectionInfo {
  totalCoinValue: AmountJson;
  totalWithdrawCost: AmountJson;
  selectedDenoms: {
    /**
     * How many times do we withdraw this denomination?
     */
    count: number;
    denom: DenominationRecord;
  }[];
}

/**
 * Selected denominations withn some extra info.
 */
export interface DenomSelectionState {
  totalCoinValue: AmountJson;
  totalWithdrawCost: AmountJson;
  selectedDenoms: {
    denomPubHash: string;
    count: 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 {
  withdrawalGroupId: string;

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

  reservePub: string;

  exchangeBaseUrl: string;

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

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

  /**
   * Amount including fees (i.e. the amount subtracted from the
   * reserve to withdraw all coins in this withdrawal session).
   */
  rawWithdrawalAmount: AmountJson;

  denomsSel: DenomSelectionState;

  denomSelUid: string;

  /**
   * Retry info, always present even on completed operations so that indexing works.
   */
  retryInfo: RetryInfo;

  lastError: TalerErrorDetails | undefined;
}

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;

  timestampStarted: Timestamp;

  timestampFinished: Timestamp | 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[];

  /**
   * We store old amount (i.e. before recoup) of recouped coins here,
   * as the balance of a recouped coin is set to zero when the
   * recoup group is created.
   */
  oldAmountPerCoin: AmountJson[];

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

  /**
   * Retry info.
   */
  retryInfo: RetryInfo;

  /**
   * Last error that occurred, if any.
   */
  lastError: TalerErrorDetails | undefined;
}

export enum BackupProviderStatus {
  PaymentRequired = "payment-required",
  Ready = "ready",
}

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

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

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

  active: boolean;

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

  lastBackupTimestamp?: Timestamp;

  /**
   * Proposal that we're currently trying to pay for.
   *
   * (Also included in paymentProposalIds.)
   */
  currentPaymentProposalId?: string;

  /**
   * 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[];

  /**
   * Next scheduled backup.
   */
  nextBackupTimestamp?: Timestamp;

  /**
   * Retry info.
   */
  retryInfo: RetryInfo;

  /**
   * Last error that occurred, if any.
   */
  lastError: TalerErrorDetails | undefined;

  /**
   * UIDs for the operation that added the backup provider.
   */
  uids: 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: ContractTerms;

  contractTermsHash: string;

  payCoinSelection: PayCoinSelection;

  totalPayCost: AmountJson;

  effectiveDepositAmount: AmountJson;

  depositedPerCoin: boolean[];

  timestampCreated: Timestamp;

  timestampFinished: Timestamp | undefined;

  lastError: TalerErrorDetails | undefined;

  /**
   * Retry info.
   */
  retryInfo: RetryInfo;
}

/**
 * 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: Timestamp;

  contractTermsHash: string;

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

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

export const WalletStoresV1 = {
  coins: describeStore(
    describeContents<CoinRecord>("coins", {
      keyPath: "coinPub",
    }),
    {
      byBaseUrl: describeIndex("byBaseUrl", "exchangeBaseUrl"),
      byDenomPubHash: describeIndex("byDenomPubHash", "denomPubHash"),
      byCoinEvHash: describeIndex("byCoinEvHash", "coinEvHash"),
    },
  ),
  config: describeStore(
    describeContents<ConfigRecord<any>>("config", { keyPath: "key" }),
    {},
  ),
  auditorTrust: describeStore(
    describeContents<AuditorTrustRecord>("auditorTrust", {
      keyPath: ["currency", "auditorBaseUrl"],
    }),
    {
      byAuditorPub: describeIndex("byAuditorPub", "auditorPub"),
      byUid: describeIndex("byUid", "uids", {
        multiEntry: true,
      }),
    },
  ),
  exchangeTrust: describeStore(
    describeContents<ExchangeTrustRecord>("exchangeTrust", {
      keyPath: ["currency", "exchangeBaseUrl"],
    }),
    {
      byExchangeMasterPub: describeIndex(
        "byExchangeMasterPub",
        "exchangeMasterPub",
      ),
    },
  ),
  denominations: describeStore(
    describeContents<DenominationRecord>("denominations", {
      keyPath: ["exchangeBaseUrl", "denomPubHash"],
    }),
    {
      byExchangeBaseUrl: describeIndex("byExchangeBaseUrl", "exchangeBaseUrl"),
    },
  ),
  exchanges: describeStore(
    describeContents<ExchangeRecord>("exchanges", {
      keyPath: "baseUrl",
    }),
    {},
  ),
  exchangeDetails: describeStore(
    describeContents<ExchangeDetailsRecord>("exchangeDetails", {
      keyPath: ["exchangeBaseUrl", "currency", "masterPublicKey"],
    }),
    {},
  ),
  proposals: describeStore(
    describeContents<ProposalRecord>("proposals", { keyPath: "proposalId" }),
    {
      byUrlAndOrderId: describeIndex("byUrlAndOrderId", [
        "merchantBaseUrl",
        "orderId",
      ]),
    },
  ),
  refreshGroups: describeStore(
    describeContents<RefreshGroupRecord>("refreshGroups", {
      keyPath: "refreshGroupId",
    }),
    {},
  ),
  recoupGroups: describeStore(
    describeContents<RecoupGroupRecord>("recoupGroups", {
      keyPath: "recoupGroupId",
    }),
    {},
  ),
  reserves: describeStore(
    describeContents<ReserveRecord>("reserves", { keyPath: "reservePub" }),
    {
      byInitialWithdrawalGroupId: describeIndex(
        "byInitialWithdrawalGroupId",
        "initialWithdrawalGroupId",
      ),
    },
  ),
  purchases: describeStore(
    describeContents<PurchaseRecord>("purchases", { keyPath: "proposalId" }),
    {
      byFulfillmentUrl: describeIndex(
        "byFulfillmentUrl",
        "download.contractData.fulfillmentUrl",
      ),
      byMerchantUrlAndOrderId: describeIndex("byMerchantUrlAndOrderId", [
        "download.contractData.merchantBaseUrl",
        "download.contractData.orderId",
      ]),
    },
  ),
  tips: describeStore(
    describeContents<TipRecord>("tips", { keyPath: "walletTipId" }),
    {
      byMerchantTipIdAndBaseUrl: describeIndex("byMerchantTipIdAndBaseUrl", [
        "merchantTipId",
        "merchantBaseUrl",
      ]),
    },
  ),
  withdrawalGroups: describeStore(
    describeContents<WithdrawalGroupRecord>("withdrawalGroups", {
      keyPath: "withdrawalGroupId",
    }),
    {
      byReservePub: describeIndex("byReservePub", "reservePub"),
    },
  ),
  planchets: describeStore(
    describeContents<PlanchetRecord>("planchets", { keyPath: "coinPub" }),
    {
      byGroupAndIndex: describeIndex("byGroupAndIndex", [
        "withdrawalGroupId",
        "coinIdx",
      ]),
      byGroup: describeIndex("byGroup", "withdrawalGroupId"),
      byCoinEvHash: describeIndex("byCoinEv", "coinEvHash"),
    },
  ),
  bankWithdrawUris: describeStore(
    describeContents<BankWithdrawUriRecord>("bankWithdrawUris", {
      keyPath: "talerWithdrawUri",
    }),
    {},
  ),
  backupProviders: describeStore(
    describeContents<BackupProviderRecord>("backupProviders", {
      keyPath: "baseUrl",
    }),
    {},
  ),
  depositGroups: describeStore(
    describeContents<DepositGroupRecord>("depositGroups", {
      keyPath: "depositGroupId",
    }),
    {},
  ),
  tombstones: describeStore(
    describeContents<TombstoneRecord>("tombstones", { keyPath: "id" }),
    {},
  ),
  ghostDepositGroups: describeStore(
    describeContents<GhostDepositGroupRecord>("ghostDepositGroups", {
      keyPath: "contractTermsHash",
    }),
    {},
  ),
};

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