/*
 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 { Logger } from "@gnu-taler/taler-util";
import { useTranslationContext } from "@gnu-taler/web-util/lib/index.browser";
import { ComponentChildren, Fragment, h, VNode } from "preact";
import talerLogo from "../assets/logo-white.svg";
import { LangSelectorLikePy as LangSelector } from "../components/LangSelector.js";
import { useBackendContext } from "../context/backend.js";
import {
  ErrorMessage,
  PageStateType,
  usePageContext,
} from "../context/pageState.js";
import { useBusinessAccountDetails } from "../hooks/circuit.js";
import { bankUiSettings } from "../settings.js";

const logger = new Logger("BankFrame");

function MaybeBusinessButton({
  account,
  onClick,
}: {
  account: string;
  onClick: () => void;
}): VNode {
  const { i18n } = useTranslationContext();
  const result = useBusinessAccountDetails(account);
  if (!result.ok) return <Fragment />;
  return (
    <div class="some-space">
      <a
        href="#"
        class="pure-button pure-button-primary"
        onClick={(e) => {
          e.preventDefault();
          onClick();
        }}
      >{i18n.str`Business Profile`}</a>
    </div>
  );
}

export function BankFrame({
  children,
  goToBusinessAccount,
}: {
  children: ComponentChildren;
  goToBusinessAccount?: () => void;
}): VNode {
  const { i18n } = useTranslationContext();
  const backend = useBackendContext();
  const { pageState, pageStateSetter } = usePageContext();
  logger.trace("state", pageState);

  const demo_sites = [];
  for (const i in bankUiSettings.demoSites)
    demo_sites.push(
      <a href={bankUiSettings.demoSites[i][1]}>
        {bankUiSettings.demoSites[i][0]}
      </a>,
    );

  return (
    <Fragment>
      <header
        class="demobar"
        style="display: flex; flex-direction: row; justify-content: space-between;"
      >
        <a href="#main" class="skip">{i18n.str`Skip to main content`}</a>
        <div style="max-width: 50em; margin-left: 2em;">
          <h1>
            <span class="it">
              <a href="/">{bankUiSettings.bankName}</a>
            </span>
          </h1>
          {maybeDemoContent(
            <p>
              <i18n.Translate>
                This part of the demo shows how a bank that supports Taler
                directly would work. In addition to using your own bank account,
                you can also see the transaction history of some{" "}
                <a href="/public-accounts">Public Accounts</a>.
              </i18n.Translate>
            </p>,
          )}
        </div>
        <a href="https://taler.net/">
          <img
            src={talerLogo}
            alt={i18n.str`Taler logo`}
            height="100"
            width="224"
            style="margin: 2em 2em"
          />
        </a>
      </header>
      <div style="display:flex; flex-direction: column;" class="navcontainer">
        <nav class="demolist">
          {maybeDemoContent(<Fragment>{demo_sites}</Fragment>)}
          <div class="right">
            <LangSelector />
          </div>
        </nav>
      </div>
      <section id="main" class="content">
        {pageState.error && (
          <ErrorBanner
            error={pageState.error}
            onClear={() => {
              pageStateSetter((prev) => ({ ...prev, error: undefined }));
            }}
          />
        )}
        <StatusBanner />
        {backend.state.status === "loggedIn" ? (
          <div class="top-right">
            {goToBusinessAccount ? (
              <MaybeBusinessButton
                account={backend.state.username}
                onClick={goToBusinessAccount}
              />
            ) : undefined}
            <div class="some-space">
              <a
                href="#"
                class="pure-button logout-button"
                onClick={() => {
                  pageStateSetter((prevState: PageStateType) => {
                    const { talerWithdrawUri, withdrawalId, ...rest } =
                      prevState;
                    backend.logOut();
                    return {
                      ...rest,
                      withdrawalInProgress: false,
                      error: undefined,
                      info: undefined,
                      isRawPayto: false,
                    };
                  });
                }}
              >{i18n.str`Logout`}</a>
            </div>
          </div>
        ) : null}
        {children}
      </section>
      <section id="footer" class="footer">
        <div class="footer">
          <hr />
          <div>
            <p>
              You can learn more about GNU Taler on our{" "}
              <a href="https://taler.net">main website</a>.
            </p>
          </div>
          <div style="flex-grow:1" />
          <p>Copyright &copy; 2014&mdash;2022 Taler Systems SA</p>
        </div>
      </section>
    </Fragment>
  );
}

function maybeDemoContent(content: VNode): VNode {
  if (bankUiSettings.showDemoNav) {
    return content;
  }
  return <Fragment />;
}

export function ErrorBanner({
  error,
  onClear,
}: {
  error: ErrorMessage;
  onClear: () => void;
}): VNode | null {
  return (
    <div class="informational informational-fail" style={{ marginTop: 8 }}>
      <div style={{ display: "flex", justifyContent: "space-between" }}>
        <p>
          <b>{error.title}</b>
        </p>
        <div>
          <input
            type="button"
            class="pure-button"
            value="Clear"
            onClick={(e) => {
              e.preventDefault();
              onClear();
            }}
          />
        </div>
      </div>
      <p>{error.description}</p>
    </div>
  );
}

function StatusBanner(): VNode | null {
  const { pageState, pageStateSetter } = usePageContext();
  if (!pageState.info) return null;

  const rval = (
    <div class="informational informational-ok" style={{ marginTop: 8 }}>
      <div style={{ display: "flex", justifyContent: "space-between" }}>
        <p>
          <b>{pageState.info}</b>
        </p>
        <div>
          <input
            type="button"
            class="pure-button"
            value="Clear"
            onClick={async () => {
              pageStateSetter((prev) => ({ ...prev, info: undefined }));
            }}
          />
        </div>
      </div>
    </div>
  );
  return rval;
}
