/*
 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 {
  AmountLike,
  Amounts,
  i18n,
  Transaction,
  TransactionType,
} from "@gnu-taler/taler-util";
import { h, VNode } from "preact";
import { route } from "preact-router";
import { useEffect, useState } from "preact/hooks";
import emptyImg from "../../static/img/empty.png";
import { ErrorMessage } from "../components/ErrorMessage";
import { Part } from "../components/Part";
import {
  Button,
  ButtonDestructive,
  ButtonPrimary,
  ListOfProducts,
  RowBorderGray,
  SmallLightText,
  WalletBox,
  WarningBox,
} from "../components/styled";
import { Time } from "../components/Time";
import { Pages } from "../NavigationBar";
import * as wxApi from "../wxApi";

export function TransactionPage({ tid }: { tid: string }): VNode {
  const [transaction, setTransaction] = useState<Transaction | undefined>(
    undefined,
  );

  useEffect(() => {
    const fetchData = async (): Promise<void> => {
      const res = await wxApi.getTransactions();
      const ts = res.transactions.filter((t) => t.transactionId === tid);
      if (ts.length === 1) {
        setTransaction(ts[0]);
      } else {
        route(Pages.history);
      }
    };
    fetchData();
  }, [tid]);

  if (!transaction) {
    return (
      <div>
        <i18n.Translate>Loading ...</i18n.Translate>
      </div>
    );
  }
  return (
    <TransactionView
      transaction={transaction}
      onDelete={() => wxApi.deleteTransaction(tid).then(() => history.go(-1))}
      onRetry={() => wxApi.retryTransaction(tid).then(() => history.go(-1))}
      onBack={() => {
        route(Pages.history);
      }}
    />
  );
}

export interface WalletTransactionProps {
  transaction: Transaction;
  onDelete: () => void;
  onRetry: () => void;
  onBack: () => void;
}

export function TransactionView({
  transaction,
  onDelete,
  onRetry,
  onBack,
}: WalletTransactionProps): VNode {
  function TransactionTemplate({ children }: { children: VNode[] }): VNode {
    return (
      <WalletBox>
        <section style={{ padding: 8, textAlign: "center" }}>
          <ErrorMessage title={transaction?.error?.hint} />
          {transaction.pending && (
            <WarningBox>
              This transaction is not completed
              <a href="">more info...</a>
            </WarningBox>
          )}
        </section>
        <section>
          <div style={{ textAlign: "center" }}>{children}</div>
        </section>
        <footer>
          <Button onClick={onBack}>
            <i18n.Translate> &lt; Back </i18n.Translate>
          </Button>
          <div>
            {transaction?.error ? (
              <ButtonPrimary onClick={onRetry}>
                <i18n.Translate>retry</i18n.Translate>
              </ButtonPrimary>
            ) : null}
            <ButtonDestructive onClick={onDelete}>
              <i18n.Translate> Forget </i18n.Translate>
            </ButtonDestructive>
          </div>
        </footer>
      </WalletBox>
    );
  }

  function amountToString(text: AmountLike): string {
    const aj = Amounts.jsonifyAmount(text);
    const amount = Amounts.stringifyValue(aj);
    return `${amount} ${aj.currency}`;
  }

  if (transaction.type === TransactionType.Withdrawal) {
    const fee = Amounts.sub(
      Amounts.parseOrThrow(transaction.amountRaw),
      Amounts.parseOrThrow(transaction.amountEffective),
    ).amount;
    return (
      <TransactionTemplate>
        <h2>Withdrawal</h2>
        <Time timestamp={transaction.timestamp} format="dd MMMM yyyy, HH:mm" />
        <br />
        <Part
          big
          title="Total withdrawn"
          text={amountToString(transaction.amountEffective)}
          kind="positive"
        />
        <Part
          big
          title="Chosen amount"
          text={amountToString(transaction.amountRaw)}
          kind="neutral"
        />
        <Part
          big
          title="Exchange fee"
          text={amountToString(fee)}
          kind="negative"
        />
        <Part
          title="Exchange"
          text={new URL(transaction.exchangeBaseUrl).hostname}
          kind="neutral"
        />
      </TransactionTemplate>
    );
  }

  const showLargePic = (): void => {
    return;
  };

  if (transaction.type === TransactionType.Payment) {
    const fee = Amounts.sub(
      Amounts.parseOrThrow(transaction.amountEffective),
      Amounts.parseOrThrow(transaction.amountRaw),
    ).amount;

    return (
      <TransactionTemplate>
        <h2>Payment </h2>
        <Time timestamp={transaction.timestamp} format="dd MMMM yyyy, HH:mm" />
        <br />
        <Part
          big
          title="Total paid"
          text={amountToString(transaction.amountEffective)}
          kind="negative"
        />
        <Part
          big
          title="Purchase amount"
          text={amountToString(transaction.amountRaw)}
          kind="neutral"
        />
        <Part big title="Fee" text={amountToString(fee)} kind="negative" />
        <Part
          title="Merchant"
          text={transaction.info.merchant.name}
          kind="neutral"
        />
        <Part title="Purchase" text={transaction.info.summary} kind="neutral" />
        <Part
          title="Receipt"
          text={`#${transaction.info.orderId}`}
          kind="neutral"
        />

        <div>
          {transaction.info.products && transaction.info.products.length > 0 && (
            <ListOfProducts>
              {transaction.info.products.map((p, k) => (
                <RowBorderGray key={k}>
                  <a href="#" onClick={showLargePic}>
                    <img src={p.image ? p.image : emptyImg} />
                  </a>
                  <div>
                    {p.quantity && p.quantity > 0 && (
                      <SmallLightText>
                        x {p.quantity} {p.unit}
                      </SmallLightText>
                    )}
                    <div>{p.description}</div>
                  </div>
                </RowBorderGray>
              ))}
            </ListOfProducts>
          )}
        </div>
      </TransactionTemplate>
    );
  }

  if (transaction.type === TransactionType.Deposit) {
    const fee = Amounts.sub(
      Amounts.parseOrThrow(transaction.amountRaw),
      Amounts.parseOrThrow(transaction.amountEffective),
    ).amount;
    return (
      <TransactionTemplate>
        <h2>Deposit </h2>
        <Time timestamp={transaction.timestamp} format="dd MMMM yyyy, HH:mm" />
        <br />
        <Part
          big
          title="Total deposit"
          text={amountToString(transaction.amountEffective)}
          kind="negative"
        />
        <Part
          big
          title="Purchase amount"
          text={amountToString(transaction.amountRaw)}
          kind="neutral"
        />
        <Part big title="Fee" text={amountToString(fee)} kind="negative" />
      </TransactionTemplate>
    );
  }

  if (transaction.type === TransactionType.Refresh) {
    const fee = Amounts.sub(
      Amounts.parseOrThrow(transaction.amountRaw),
      Amounts.parseOrThrow(transaction.amountEffective),
    ).amount;
    return (
      <TransactionTemplate>
        <h2>Refresh</h2>
        <Time timestamp={transaction.timestamp} format="dd MMMM yyyy, HH:mm" />
        <br />
        <Part
          big
          title="Total refresh"
          text={amountToString(transaction.amountEffective)}
          kind="negative"
        />
        <Part
          big
          title="Refresh amount"
          text={amountToString(transaction.amountRaw)}
          kind="neutral"
        />
        <Part big title="Fee" text={amountToString(fee)} kind="negative" />
      </TransactionTemplate>
    );
  }

  if (transaction.type === TransactionType.Tip) {
    const fee = Amounts.sub(
      Amounts.parseOrThrow(transaction.amountRaw),
      Amounts.parseOrThrow(transaction.amountEffective),
    ).amount;
    return (
      <TransactionTemplate>
        <h2>Tip</h2>
        <Time timestamp={transaction.timestamp} format="dd MMMM yyyy, HH:mm" />
        <br />
        <Part
          big
          title="Total tip"
          text={amountToString(transaction.amountEffective)}
          kind="positive"
        />
        <Part
          big
          title="Received amount"
          text={amountToString(transaction.amountRaw)}
          kind="neutral"
        />
        <Part big title="Fee" text={amountToString(fee)} kind="negative" />
      </TransactionTemplate>
    );
  }

  if (transaction.type === TransactionType.Refund) {
    const fee = Amounts.sub(
      Amounts.parseOrThrow(transaction.amountRaw),
      Amounts.parseOrThrow(transaction.amountEffective),
    ).amount;
    return (
      <TransactionTemplate>
        <h2>Refund</h2>
        <Time timestamp={transaction.timestamp} format="dd MMMM yyyy, HH:mm" />
        <br />
        <Part
          big
          title="Total refund"
          text={amountToString(transaction.amountEffective)}
          kind="positive"
        />
        <Part
          big
          title="Refund amount"
          text={amountToString(transaction.amountRaw)}
          kind="neutral"
        />
        <Part big title="Fee" text={amountToString(fee)} kind="negative" />
        <Part
          title="Merchant"
          text={transaction.info.merchant.name}
          kind="neutral"
        />
        <Part title="Purchase" text={transaction.info.summary} kind="neutral" />
        <Part
          title="Receipt"
          text={`#${transaction.info.orderId}`}
          kind="neutral"
        />

        <p>{transaction.info.summary}</p>
        <div>
          {transaction.info.products && transaction.info.products.length > 0 && (
            <ListOfProducts>
              {transaction.info.products.map((p, k) => (
                <RowBorderGray key={k}>
                  <a href="#" onClick={showLargePic}>
                    <img src={p.image ? p.image : emptyImg} />
                  </a>
                  <div>
                    {p.quantity && p.quantity > 0 && (
                      <SmallLightText>
                        x {p.quantity} {p.unit}
                      </SmallLightText>
                    )}
                    <div>{p.description}</div>
                  </div>
                </RowBorderGray>
              ))}
            </ListOfProducts>
          )}
        </div>
      </TransactionTemplate>
    );
  }

  return <div />;
}