/*
 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 { AmountString, Timestamp, Transaction, TransactionsResponse, TransactionType } from "@gnu-taler/taler-util";
import { JSX } from "preact";
import { useEffect, useState } from "preact/hooks";
import * as wxApi from "../wxApi";
import { Pages } from "./popup";


export function HistoryPage(props: any): JSX.Element {
  const [transactions, setTransactions] = useState<
    TransactionsResponse | undefined
  >(undefined);

  useEffect(() => {
    const fetchData = async (): Promise<void> => {
      const res = await wxApi.getTransactions();
      setTransactions(res);
    };
    fetchData();
  }, []);

  if (!transactions) {
    return <div>Loading ...</div>;
  }

  const txs = [...transactions.transactions].reverse();

  return (
    <div>
      {txs.map((tx, i) => (
        <TransactionItem key={i} tx={tx} />
      ))}
    </div>
  );
}

function TransactionItem(props: { tx: Transaction }): JSX.Element {
  const tx = props.tx;
  switch (tx.type) {
    case TransactionType.Withdrawal:
      return (
        <TransactionLayout
          id={tx.transactionId}
          amount={tx.amountEffective}
          debitCreditIndicator={"credit"}
          title="Withdrawal"
          subtitle={`via ${tx.exchangeBaseUrl}`}
          timestamp={tx.timestamp}
          iconPath="/static/img/ri-bank-line.svg"
          pending={tx.pending}
        ></TransactionLayout>
      );
    case TransactionType.Payment:
      return (
        <TransactionLayout
          id={tx.transactionId}
          amount={tx.amountEffective}
          debitCreditIndicator={"debit"}
          title="Payment"
          subtitle={tx.info.summary}
          timestamp={tx.timestamp}
          iconPath="/static/img/ri-shopping-cart-line.svg"
          pending={tx.pending}
        ></TransactionLayout>
      );
    case TransactionType.Refund:
      return (
        <TransactionLayout
          id={tx.transactionId}
          amount={tx.amountEffective}
          debitCreditIndicator={"credit"}
          title="Refund"
          subtitle={tx.info.summary}
          timestamp={tx.timestamp}
          iconPath="/static/img/ri-refund-2-line.svg"
          pending={tx.pending}
        ></TransactionLayout>
      );
    case TransactionType.Tip:
      return (
        <TransactionLayout
          id={tx.transactionId}
          amount={tx.amountEffective}
          debitCreditIndicator={"credit"}
          title="Tip"
          subtitle={`from ${new URL(tx.merchantBaseUrl).hostname}`}
          timestamp={tx.timestamp}
          iconPath="/static/img/ri-hand-heart-line.svg"
          pending={tx.pending}
        ></TransactionLayout>
      );
    case TransactionType.Refresh:
      return (
        <TransactionLayout
          id={tx.transactionId}
          amount={tx.amountEffective}
          debitCreditIndicator={"credit"}
          title="Refresh"
          subtitle={`via exchange ${tx.exchangeBaseUrl}`}
          timestamp={tx.timestamp}
          iconPath="/static/img/ri-refresh-line.svg"
          pending={tx.pending}
        ></TransactionLayout>
      );
    case TransactionType.Deposit:
      return (
        <TransactionLayout
          id={tx.transactionId}
          amount={tx.amountEffective}
          debitCreditIndicator={"debit"}
          title="Refresh"
          subtitle={`to ${tx.targetPaytoUri}`}
          timestamp={tx.timestamp}
          iconPath="/static/img/ri-refresh-line.svg"
          pending={tx.pending}
        ></TransactionLayout>
      );
  }
}

function TransactionLayout(props: TransactionLayoutProps): JSX.Element {
  const date = new Date(props.timestamp.t_ms);
  const dateStr = date.toLocaleString([], {
    dateStyle: "medium",
    timeStyle: "short",
  } as any);
  return (
    <div
      style={{
        display: "flex",
        flexDirection: "row",
        border: "1px solid gray",
        borderRadius: "0.5em",
        margin: "0.5em 0",
        justifyContent: "space-between",
        padding: "0.5em",
      }}
    >
      <img src={props.iconPath} />
      <div
        style={{ display: "flex", flexDirection: "column", marginLeft: "1em" }}
      >
        <div style={{ fontSize: "small", color: "gray" }}>{dateStr}</div>
        <div style={{ fontVariant: "small-caps", fontSize: "x-large" }}>
          <a href={Pages.transaction.replace(':tid', props.id)}><span>{props.title}</span></a>
          {props.pending ? (
            <span style={{ color: "darkblue" }}> (Pending)</span>
          ) : null}
        </div>

        <div>{props.subtitle}</div>
      </div>
      <TransactionAmount
        pending={props.pending}
        amount={props.amount}
        debitCreditIndicator={props.debitCreditIndicator}
      />
    </div>
  );
}

interface TransactionLayoutProps {
  debitCreditIndicator: "debit" | "credit" | "unknown";
  amount: AmountString | "unknown";
  timestamp: Timestamp;
  title: string;
  id: string;
  subtitle: string;
  iconPath: string;
  pending: boolean;
}

interface TransactionAmountProps {
  debitCreditIndicator: "debit" | "credit" | "unknown";
  amount: AmountString | "unknown";
  pending: boolean;
}

function TransactionAmount(props: TransactionAmountProps): JSX.Element {
  const [currency, amount] = props.amount.split(":");
  let sign: string;
  switch (props.debitCreditIndicator) {
    case "credit":
      sign = "+";
      break;
    case "debit":
      sign = "-";
      break;
    case "unknown":
      sign = "";
  }
  const style: JSX.AllCSSProperties = {
    marginLeft: "auto",
    display: "flex",
    flexDirection: "column",
    alignItems: "center",
    alignSelf: "center"
  };
  if (props.pending) {
    style.color = "gray";
  }
  return (
    <div style={{ ...style }}>
      <div style={{ fontSize: "x-large" }}>
        {sign}
        {amount}
      </div>
      <div>{currency}</div>
    </div>
  );
}