/*
 This file is part of TALER
 (C) 2016 GNUnet e.V.

 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.

 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
 TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
*/

import { i18n, Timestamp } from "@gnu-taler/taler-util";
import {
  ProviderInfo,
  ProviderPaymentStatus,
  ProviderPaymentType,
} from "@gnu-taler/taler-wallet-core";
import { format, formatDuration, intervalToDuration } from "date-fns";
import { Fragment, VNode, h } from "preact";
import { ErrorMessage } from "../components/ErrorMessage";
import {
  Button,
  ButtonDestructive,
  ButtonPrimary,
  PaymentStatus,
  WalletBox,
  SmallLightText,
} from "../components/styled";
import { useProviderStatus } from "../hooks/useProviderStatus";

interface Props {
  pid: string;
  onBack: () => void;
}

export function ProviderDetailPage({ pid, onBack }: Props): VNode {
  const status = useProviderStatus(pid);
  if (!status) {
    return (
      <div>
        <i18n.Translate>Loading...</i18n.Translate>
      </div>
    );
  }
  if (!status.info) {
    onBack();
    return <div />;
  }
  return (
    <ProviderView
      info={status.info}
      onSync={status.sync}
      onDelete={() => status.remove().then(onBack)}
      onBack={onBack}
      onExtend={() => {
        null;
      }}
    />
  );
}

export interface ViewProps {
  info: ProviderInfo;
  onDelete: () => void;
  onSync: () => void;
  onBack: () => void;
  onExtend: () => void;
}

export function ProviderView({
  info,
  onDelete,
  onSync,
  onBack,
  onExtend,
}: ViewProps): VNode {
  const lb = info?.lastSuccessfulBackupTimestamp;
  const isPaid =
    info.paymentStatus.type === ProviderPaymentType.Paid ||
    info.paymentStatus.type === ProviderPaymentType.TermsChanged;
  return (
    <WalletBox>
      <Error info={info} />
      <header>
        <h3>
          {info.name}{" "}
          <SmallLightText>{info.syncProviderBaseUrl}</SmallLightText>
        </h3>
        <PaymentStatus color={isPaid ? "rgb(28, 184, 65)" : "rgb(202, 60, 60)"}>
          {isPaid ? "Paid" : "Unpaid"}
        </PaymentStatus>
      </header>
      <section>
        <p>
          <b>Last backup:</b>{" "}
          {lb == null || lb.t_ms == "never"
            ? "never"
            : format(lb.t_ms, "dd MMM yyyy")}{" "}
        </p>
        <ButtonPrimary onClick={onSync}>
          <i18n.Translate>Back up</i18n.Translate>
        </ButtonPrimary>
        {info.terms && (
          <Fragment>
            <p>
              <b>Provider fee:</b> {info.terms && info.terms.annualFee} per year
            </p>
          </Fragment>
        )}
        <p>{descriptionByStatus(info.paymentStatus)}</p>
        <ButtonPrimary disabled onClick={onExtend}>
          <i18n.Translate>Extend</i18n.Translate>
        </ButtonPrimary>

        {info.paymentStatus.type === ProviderPaymentType.TermsChanged && (
          <div>
            <p>
              <i18n.Translate>
                terms has changed, extending the service will imply accepting
                the new terms of service
              </i18n.Translate>
            </p>
            <table>
              <thead>
                <tr>
                  <td></td>
                  <td>
                    <i18n.Translate>old</i18n.Translate>
                  </td>
                  <td> -&gt;</td>
                  <td>
                    <i18n.Translate>new</i18n.Translate>
                  </td>
                </tr>
              </thead>
              <tbody>
                <tr>
                  <td>
                    <i18n.Translate>fee</i18n.Translate>
                  </td>
                  <td>{info.paymentStatus.oldTerms.annualFee}</td>
                  <td>-&gt;</td>
                  <td>{info.paymentStatus.newTerms.annualFee}</td>
                </tr>
                <tr>
                  <td>
                    <i18n.Translate>storage</i18n.Translate>
                  </td>
                  <td>{info.paymentStatus.oldTerms.storageLimitInMegabytes}</td>
                  <td>-&gt;</td>
                  <td>{info.paymentStatus.newTerms.storageLimitInMegabytes}</td>
                </tr>
              </tbody>
            </table>
          </div>
        )}
      </section>
      <footer>
        <Button onClick={onBack}>
          <i18n.Translate> &lt; back</i18n.Translate>
        </Button>
        <div>
          <ButtonDestructive onClick={onDelete}>
            <i18n.Translate>remove provider</i18n.Translate>
          </ButtonDestructive>
        </div>
      </footer>
    </WalletBox>
  );
}

function daysSince(d?: Timestamp) {
  if (!d || d.t_ms === "never") return "never synced";
  const duration = intervalToDuration({
    start: d.t_ms,
    end: new Date(),
  });
  const str = formatDuration(duration, {
    delimiter: ", ",
    format: [
      duration?.years
        ? i18n.str`years`
        : duration?.months
        ? i18n.str`months`
        : duration?.days
        ? i18n.str`days`
        : duration?.hours
        ? i18n.str`hours`
        : duration?.minutes
        ? i18n.str`minutes`
        : i18n.str`seconds`,
    ],
  });
  return `synced ${str} ago`;
}

function Error({ info }: { info: ProviderInfo }) {
  if (info.lastError) {
    return <ErrorMessage title={info.lastError.hint} />;
  }
  if (info.backupProblem) {
    switch (info.backupProblem.type) {
      case "backup-conflicting-device":
        return (
          <ErrorMessage
            title={
              <Fragment>
                <i18n.Translate>
                  There is conflict with another backup from{" "}
                  <b>{info.backupProblem.otherDeviceId}</b>
                </i18n.Translate>
              </Fragment>
            }
          />
        );
      case "backup-unreadable":
        return <ErrorMessage title="Backup is not readable" />;
      default:
        return (
          <ErrorMessage
            title={
              <Fragment>
                <i18n.Translate>
                  Unknown backup problem: {JSON.stringify(info.backupProblem)}
                </i18n.Translate>
              </Fragment>
            }
          />
        );
    }
  }
  return null;
}

function colorByStatus(status: ProviderPaymentType) {
  switch (status) {
    case ProviderPaymentType.InsufficientBalance:
      return "rgb(223, 117, 20)";
    case ProviderPaymentType.Unpaid:
      return "rgb(202, 60, 60)";
    case ProviderPaymentType.Paid:
      return "rgb(28, 184, 65)";
    case ProviderPaymentType.Pending:
      return "gray";
    case ProviderPaymentType.InsufficientBalance:
      return "rgb(202, 60, 60)";
    case ProviderPaymentType.TermsChanged:
      return "rgb(202, 60, 60)";
  }
}

function descriptionByStatus(status: ProviderPaymentStatus) {
  switch (status.type) {
    // return i18n.str`no enough balance to make the payment`
    // return i18n.str`not paid yet`
    case ProviderPaymentType.Paid:
    case ProviderPaymentType.TermsChanged:
      if (status.paidUntil.t_ms === "never") {
        return i18n.str`service paid`;
      } else {
        return (
          <Fragment>
            <b>Backup valid until:</b>{" "}
            {format(status.paidUntil.t_ms, "dd MMM yyyy")}
          </Fragment>
        );
      }
    case ProviderPaymentType.Unpaid:
    case ProviderPaymentType.InsufficientBalance:
    case ProviderPaymentType.Pending:
      return "";
  }
}