/*
 This file is part of GNU Taler
 (C) 2021-2024 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 { useLang, useTranslationContext } from "@gnu-taler/web-util/browser";
import { VNode, h } from "preact";
import {
  FormErrors,
  FormProvider,
} from "../../components/form/FormProvider.js";
import { InputSelector } from "../../components/form/InputSelector.js";
import { InputToggle } from "../../components/form/InputToggle.js";
import { LangSelector } from "../../components/menu/LangSelector.js";
import { Preferences, usePreference } from "../../hooks/preference.js";
import { AbsoluteTime } from "@gnu-taler/taler-util";

function getBrowserLang(): string | undefined {
  if (typeof window === "undefined") return undefined;
  if (window.navigator.languages) return window.navigator.languages[0];
  if (window.navigator.language) return window.navigator.language;
  return undefined;
}

export function Settings({ onClose }: { onClose?: () => void }): VNode {
  const { i18n } = useTranslationContext();
  const borwserLang = getBrowserLang();
  const { update } = useLang(undefined, {});

  const [value, , updateValue] = usePreference();
  const errors: FormErrors<Preferences> = {};

  function valueHandler(s: (d: Partial<Preferences>) => Partial<Preferences>): void {
    const next = s(value);
    const v: Preferences = {
      advanceOrderMode: next.advanceOrderMode ?? false,
      hideKycUntil: next.hideKycUntil ?? AbsoluteTime.never(),
      dateFormat: next.dateFormat ?? "ymd",
    };
    updateValue(v);
  }

  return (
    <div>
      <section class="section is-main-section">
        <div class="columns">
          <div class="column" />
          <div class="column is-four-fifths">
            <div>
              <FormProvider<Preferences>
                name="settings"
                errors={errors}
                object={value}
                valueHandler={valueHandler}
              >
                <div class="field is-horizontal">
                  <div class="field-label is-normal">
                    <label class="label">
                      <i18n.Translate>Language</i18n.Translate>
                      <span
                        class="icon has-tooltip-right"
                        data-tooltip={
                          "Force language setting instance of taking the browser"
                        }
                      >
                        <i class="mdi mdi-information" />
                      </span>
                    </label>
                  </div>
                  <div class="field field-body has-addons is-flex-grow-3">
                    <LangSelector />
                    &nbsp;
                    {borwserLang !== undefined && (
                      <button
                        data-tooltip={i18n.str`generate random secret key`}
                        class="button is-info mr-2"
                        onClick={(e) => {
                          update(borwserLang.substring(0, 2));
                          e.preventDefault()
                        }}
                      >
                        <i18n.Translate>Set default</i18n.Translate>
                      </button>
                    )}
                  </div>
                </div>
                <InputToggle<Preferences>
                  label={i18n.str`Advance order creation`}
                  tooltip={i18n.str`Shows more options in the order creation form`}
                  name="advanceOrderMode"
                />
                <InputSelector<Preferences>
                  name="dateFormat"
                  label={i18n.str`Date format`}
                  expand={true}
                  help={
                    value.dateFormat === "dmy"
                      ? "31/12/2001"
                      : value.dateFormat === "mdy"
                        ? "12/31/2001"
                        : value.dateFormat === "ymd"
                          ? "2001/12/31"
                          : ""
                  }
                  toStr={(e) => {
                    if (e === "ymd") return "year month day";
                    if (e === "mdy") return "month day year";
                    if (e === "dmy") return "day month year";
                    return "choose one";
                  }}
                  values={["ymd", "mdy", "dmy"]}
                  tooltip={i18n.str`how the date is going to be displayed`}
                />
              </FormProvider>
            </div>
          </div>
          <div class="column" />
        </div>
      </section>
      {onClose && (
        <section class="section is-main-section">
          <button class="button" onClick={onClose}>
            <i18n.Translate>Close</i18n.Translate>
          </button>
        </section>
      )}
    </div>
  );
}