/*
 This file is part of GNU Taler
 (C) 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/>
 */

import {
  buildPayto,
  KnownBankAccountsInfo,
  PaytoUriBitcoin,
  PaytoUriIBAN,
  PaytoUriTalerBank,
  stringifyPaytoUri,
} from "@gnu-taler/taler-util";
import { styled } from "@linaria/react";
import { Fragment, h, VNode } from "preact";
import { useState } from "preact/hooks";
import { ErrorMessage } from "../../components/ErrorMessage.js";
import { SelectList } from "../../components/SelectList.js";
import {
  Input,
  SubTitle,
  SvgIcon,
  WarningText,
} from "../../components/styled/index.js";
import { useTranslationContext } from "../../context/translation.js";
import { Button } from "../../mui/Button.js";
import { TextFieldHandler } from "../../mui/handlers.js";
import { TextField } from "../../mui/TextField.js";
import checkIcon from "../../svg/check_24px.svg";
import deleteIcon from "../../svg/delete_24px.svg";
import warningIcon from "../../svg/warning_24px.svg";
import { State } from "./index.js";

type AccountType = "bitcoin" | "x-taler-bank" | "iban";
type ComponentFormByAccountType = {
  [type in AccountType]: (props: { field: TextFieldHandler }) => VNode;
};

type ComponentListByAccountType = {
  [type in AccountType]: (props: {
    list: KnownBankAccountsInfo[];
    onDelete: (a: KnownBankAccountsInfo) => Promise<void>;
  }) => VNode;
};

const formComponentByAccountType: ComponentFormByAccountType = {
  iban: IbanAddressAccount,
  bitcoin: BitcoinAddressAccount,
  "x-taler-bank": TalerBankAddressAccount,
};
const tableComponentByAccountType: ComponentListByAccountType = {
  iban: IbanTable,
  bitcoin: BitcoinTable,
  "x-taler-bank": TalerBankTable,
};

const AccountTable = styled.table`
  width: 100%;

  border-collapse: separate;
  border-spacing: 0px 10px;
  tbody tr:nth-child(odd) > td:not(.actions, .kyc) {
    background-color: lightgrey;
  }
  .actions,
  .kyc {
    width: 10px;
    background-color: inherit;
  }
`;

export function ReadyView({
  currency,
  error,
  accountType,
  accountByType,
  alias,
  onAccountAdded,
  deleteAccount,
  onCancel,
  uri,
}: State.Ready): VNode {
  const { i18n } = useTranslationContext();

  return (
    <Fragment>
      <section>
        <SubTitle>
          <i18n.Translate>Known accounts for {currency}</i18n.Translate>
        </SubTitle>
        <p>
          <i18n.Translate>
            To add a new account first select the account type.
          </i18n.Translate>
        </p>

        {error && (
          <ErrorMessage
            title={i18n.str`Unable add this account`}
            description={error}
          />
        )}
        <p>
          <Input>
            <SelectList
              label={i18n.str`Select account type`}
              list={accountType.list}
              name="accountType"
              value={accountType.value}
              onChange={accountType.onChange}
            />
          </Input>
        </p>
        {accountType.value === "" ? undefined : (
          <Fragment>
            <p>
              <CustomFieldByAccountType
                type={accountType.value as AccountType}
                field={uri}
              />
            </p>
            <p>
              <TextField
                label="Alias"
                variant="filled"
                placeholder="Easy to remember description"
                fullWidth
                disabled={accountType.value === ""}
                value={alias.value}
                onChange={alias.onInput}
              />
            </p>
          </Fragment>
        )}
      </section>
      <section>
        <Button
          variant="contained"
          color="secondary"
          onClick={onCancel.onClick}
        >
          <i18n.Translate>Cancel</i18n.Translate>
        </Button>
        <Button
          variant="contained"
          onClick={onAccountAdded.onClick}
          disabled={!onAccountAdded.onClick}
        >
          <i18n.Translate>Add</i18n.Translate>
        </Button>
      </section>
      <section>
        {Object.entries(accountByType).map(([type, list]) => {
          const Table = tableComponentByAccountType[type as AccountType];
          return <Table key={type} list={list} onDelete={deleteAccount} />;
        })}
      </section>
    </Fragment>
  );
}

function IbanTable({
  list,
  onDelete,
}: {
  list: KnownBankAccountsInfo[];
  onDelete: (ac: KnownBankAccountsInfo) => void;
}): VNode {
  const { i18n } = useTranslationContext();
  if (list.length === 0) return <Fragment />;
  return (
    <div>
      <h1>
        <i18n.Translate>IBAN accounts</i18n.Translate>
      </h1>
      <AccountTable>
        <thead>
          <tr>
            <th>
              <i18n.Translate>Alias</i18n.Translate>
            </th>
            <th>
              <i18n.Translate>Bank Id</i18n.Translate>
            </th>
            <th>
              <i18n.Translate>Int. Account Number</i18n.Translate>
            </th>
            <th>
              <i18n.Translate>Account name</i18n.Translate>
            </th>
            <th class="kyc">
              <i18n.Translate>KYC</i18n.Translate>
            </th>
            <th class="actions"></th>
          </tr>
        </thead>
        <tbody>
          {list.map((account) => {
            const p = account.uri as PaytoUriIBAN;
            return (
              <tr key={account.alias}>
                <td>{account.alias}</td>
                <td>{p.bic}</td>
                <td>{p.iban}</td>
                <td>{p.params["receiver-name"]}</td>
                <td class="kyc">
                  {account.kyc_completed ? (
                    <SvgIcon
                      title={i18n.str`KYC done`}
                      dangerouslySetInnerHTML={{ __html: checkIcon }}
                      color="green"
                    />
                  ) : (
                    <SvgIcon
                      title={i18n.str`KYC missing`}
                      dangerouslySetInnerHTML={{ __html: warningIcon }}
                      color="orange"
                    />
                  )}
                </td>
                <td class="actions">
                  <Button
                    variant="outlined"
                    startIcon={deleteIcon}
                    size="small"
                    onClick={async () => onDelete(account)}
                    color="error"
                  >
                    Forget
                  </Button>
                </td>
              </tr>
            );
          })}
        </tbody>
      </AccountTable>
    </div>
  );
}

function TalerBankTable({
  list,
  onDelete,
}: {
  list: KnownBankAccountsInfo[];
  onDelete: (ac: KnownBankAccountsInfo) => void;
}): VNode {
  const { i18n } = useTranslationContext();
  if (list.length === 0) return <Fragment />;
  return (
    <div>
      <h1>
        <i18n.Translate>Taler accounts</i18n.Translate>
      </h1>
      <AccountTable>
        <thead>
          <tr>
            <th>
              <i18n.Translate>Alias</i18n.Translate>
            </th>
            <th>
              <i18n.Translate>Host</i18n.Translate>
            </th>
            <th>
              <i18n.Translate>Account</i18n.Translate>
            </th>
            <th class="kyc">
              <i18n.Translate>KYC</i18n.Translate>
            </th>
            <th class="actions"></th>
          </tr>
        </thead>
        <tbody>
          {list.map((account) => {
            const p = account.uri as PaytoUriTalerBank;
            return (
              <tr key={account.alias}>
                <td>{account.alias}</td>
                <td>{p.host}</td>
                <td>{p.account}</td>
                <td class="kyc">
                  {account.kyc_completed ? (
                    <SvgIcon
                      title={i18n.str`KYC done`}
                      dangerouslySetInnerHTML={{ __html: checkIcon }}
                      color="green"
                    />
                  ) : (
                    <SvgIcon
                      title={i18n.str`KYC missing`}
                      dangerouslySetInnerHTML={{ __html: warningIcon }}
                      color="orange"
                    />
                  )}
                </td>
                <td class="actions">
                  <Button
                    variant="outlined"
                    startIcon={deleteIcon}
                    size="small"
                    onClick={async () => onDelete(account)}
                    color="error"
                  >
                    Forget
                  </Button>
                </td>
              </tr>
            );
          })}
        </tbody>
      </AccountTable>
    </div>
  );
}

function BitcoinTable({
  list,
  onDelete,
}: {
  list: KnownBankAccountsInfo[];
  onDelete: (ac: KnownBankAccountsInfo) => void;
}): VNode {
  const { i18n } = useTranslationContext();
  if (list.length === 0) return <Fragment />;
  return (
    <div>
      <h2>
        <i18n.Translate>Bitcoin accounts</i18n.Translate>
      </h2>
      <AccountTable>
        <thead>
          <tr>
            <th>
              <i18n.Translate>Alias</i18n.Translate>
            </th>
            <th>
              <i18n.Translate>Address</i18n.Translate>
            </th>
            <th class="kyc">
              <i18n.Translate>KYC</i18n.Translate>
            </th>
            <th class="actions"></th>
          </tr>
        </thead>
        <tbody>
          {list.map((account) => {
            const p = account.uri as PaytoUriBitcoin;
            return (
              <tr key={account.alias}>
                <td>{account.alias}</td>
                <td>{p.targetPath}</td>
                <td class="kyc">
                  {account.kyc_completed ? (
                    <SvgIcon
                      title={i18n.str`KYC done`}
                      dangerouslySetInnerHTML={{ __html: checkIcon }}
                      color="green"
                    />
                  ) : (
                    <SvgIcon
                      title={i18n.str`KYC missing`}
                      dangerouslySetInnerHTML={{ __html: warningIcon }}
                      color="orange"
                    />
                  )}
                </td>
                <td class="actions">
                  <Button
                    variant="outlined"
                    startIcon={deleteIcon}
                    size="small"
                    onClick={async () => onDelete(account)}
                    color="error"
                  >
                    Forget
                  </Button>
                </td>
              </tr>
            );
          })}
        </tbody>
      </AccountTable>
    </div>
  );
}

function BitcoinAddressAccount({ field }: { field: TextFieldHandler }): VNode {
  const { i18n } = useTranslationContext();
  const [value, setValue] = useState<string | undefined>(undefined);
  const errors = undefinedIfEmpty({
    value: !value ? i18n.str`Can't be empty` : undefined,
  });
  return (
    <Fragment>
      <TextField
        label="Bitcoin address"
        variant="standard"
        fullWidth
        value={value}
        error={value !== undefined ? errors?.value : undefined}
        disabled={!field.onInput}
        onChange={(v) => {
          setValue(v);
          if (!errors && field.onInput) {
            const p = buildPayto("bitcoin", v, undefined);
            field.onInput(stringifyPaytoUri(p));
          }
        }}
      />
    </Fragment>
  );
}

function undefinedIfEmpty<T extends object>(obj: T): T | undefined {
  return Object.keys(obj).some((k) => (obj as any)[k] !== undefined)
    ? obj
    : undefined;
}

function TalerBankAddressAccount({
  field,
}: {
  field: TextFieldHandler;
}): VNode {
  const { i18n } = useTranslationContext();
  const [host, setHost] = useState<string | undefined>(undefined);
  const [account, setAccount] = useState<string | undefined>(undefined);
  const errors = undefinedIfEmpty({
    host: !host ? i18n.str`Can't be empty` : undefined,
    account: !account ? i18n.str`Can't be empty` : undefined,
  });
  return (
    <Fragment>
      <TextField
        label="Bank host"
        variant="standard"
        fullWidth
        value={host}
        error={host !== undefined ? errors?.host : undefined}
        disabled={!field.onInput}
        onChange={(v) => {
          setHost(v);
          if (!errors && field.onInput && account) {
            const p = buildPayto("x-taler-bank", v, account);
            field.onInput(stringifyPaytoUri(p));
          }
        }}
      />
      <TextField
        label="Bank account"
        variant="standard"
        fullWidth
        disabled={!field.onInput}
        value={account}
        error={account !== undefined ? errors?.account : undefined}
        onChange={(v) => {
          setAccount(v || "");
          if (!errors && field.onInput && host) {
            const p = buildPayto("x-taler-bank", host, v);
            field.onInput(stringifyPaytoUri(p));
          }
        }}
      />
    </Fragment>
  );
}

//Taken from libeufin and libeufin took it from the ISO20022 XSD schema
const bicRegex = /^[A-Z]{6}[A-Z2-9][A-NP-Z0-9]([A-Z0-9]{3})?$/;
const ibanRegex = /^[A-Z]{2}[0-9]{2}[a-zA-Z0-9]{1,30}$/;

function IbanAddressAccount({ field }: { field: TextFieldHandler }): VNode {
  const { i18n } = useTranslationContext();
  const [bic, setBic] = useState<string | undefined>(undefined);
  const [iban, setIban] = useState<string | undefined>(undefined);
  const [name, setName] = useState<string | undefined>(undefined);
  const errors = undefinedIfEmpty({
    bic: !bic
      ? undefined
      : !bicRegex.test(bic)
      ? i18n.str`Invalid bic`
      : undefined,
    iban: !iban
      ? i18n.str`Can't be empty`
      : !ibanRegex.test(iban)
      ? i18n.str`Invalid iban`
      : undefined,
    name: !name ? i18n.str`Can't be empty` : undefined,
  });

  function sendUpdateIfNoErrors(
    bic: string | undefined,
    iban: string,
    name: string,
  ): void {
    if (!errors && field.onInput) {
      const p = buildPayto("iban", iban, bic);
      p.params["receiver-name"] = name;
      field.onInput(stringifyPaytoUri(p));
    }
  }
  return (
    <Fragment>
      <p>
        <TextField
          label="BIC"
          variant="filled"
          placeholder="BANKID"
          fullWidth
          value={bic}
          error={bic !== undefined ? errors?.bic : undefined}
          disabled={!field.onInput}
          onChange={(v) => {
            setBic(v);
            sendUpdateIfNoErrors(v, iban || "", name || "");
          }}
        />
      </p>
      <p>
        <TextField
          label="IBAN"
          variant="filled"
          placeholder="XX123456"
          fullWidth
          required
          value={iban}
          error={iban !== undefined ? errors?.iban : undefined}
          disabled={!field.onInput}
          onChange={(v) => {
            setIban(v);
            sendUpdateIfNoErrors(bic, v, name || "");
          }}
        />
      </p>
      <p>
        <TextField
          label="Receiver name"
          variant="filled"
          placeholder="Name of the target bank account owner"
          fullWidth
          required
          value={name}
          error={name !== undefined ? errors?.name : undefined}
          disabled={!field.onInput}
          onChange={(v) => {
            setName(v);
            sendUpdateIfNoErrors(bic, iban || "", v);
          }}
        />
      </p>
    </Fragment>
  );
}

function CustomFieldByAccountType({
  type,
  field,
}: {
  type: AccountType;
  field: TextFieldHandler;
}): VNode {
  const { i18n } = useTranslationContext();

  const AccountForm = formComponentByAccountType[type];

  return (
    <div>
      <WarningText>
        <i18n.Translate>
          We can not validate the account so make sure the value is correct.
        </i18n.Translate>
      </WarningText>
      <AccountForm field={field} />
    </div>
  );
}