'use client';

import { useCallback, useEffect, useMemo, useState } from 'react';
import { useSearchParams } from 'next/navigation';
import { Copy, ImageIcon, LayoutGrid, Loader2, RefreshCw, TextQuote, UserCircle2, ArrowLeft } from 'lucide-react';
import { usePublicSettings } from '@/components/id/public-settings-provider';
import { useToast } from '@/components/id/toast-provider';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import {
  fetchBot,
  getApiErrorMessage,
  revokeManagedBotToken,
  updateManagedBot,
  updateManagedBotProfile
} from '@/lib/api';
import { useMiniAppAuth } from '@/hooks/use-mini-app-auth';
import { parseComposerMenuButtonJson } from '@/lib/bot-menu-button';

function FieldTextarea({
  label,
  hint,
  value,
  onChange,
  maxLength,
  rows = 3
}: {
  label: string;
  hint?: string;
  value: string;
  onChange: (value: string) => void;
  maxLength?: number;
  rows?: number;
}) {
  return (
    <div className="space-y-2">
      <label className="text-sm font-medium">{label}</label>
      {hint ? <p className="text-xs text-[#667085]">{hint}</p> : null}
      <textarea
        value={value}
        onChange={(event) => onChange(event.target.value)}
        maxLength={maxLength}
        rows={rows}
        className="w-full resize-y rounded-xl border border-[#dce3ec] bg-white px-3 py-2 text-sm outline-none transition focus:border-[#3390ec] focus:ring-2 focus:ring-[#3390ec]/15"
      />
      {maxLength ? <p className="text-right text-xs text-[#a8adbc]">{value.length}/{maxLength}</p> : null}
    </div>
  );
}

function SectionCard({
  icon: Icon,
  title,
  description,
  children
}: {
  icon: React.ComponentType<{ className?: string }>;
  title: string;
  description: string;
  children: React.ReactNode;
}) {
  return (
    <section className="space-y-4 rounded-[20px] border border-[#eceef4] bg-[#fafbfc] p-4">
      <div className="flex items-start gap-3">
        <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-2xl bg-[#3390ec]/10 text-[#3390ec]">
          <Icon className="h-5 w-5" />
        </div>
        <div>
          <h2 className="font-semibold">{title}</h2>
          <p className="text-sm text-[#667085]">{description}</p>
        </div>
      </div>
      {children}
    </section>
  );
}

export function BotManageMiniAppContent({
  botId: botIdProp,
  onBack,
  botHint
}: {
  botId?: string;
  onBack?: () => void;
  botHint?: string;
} = {}) {
  const searchParams = useSearchParams();
  const botId = botIdProp ?? searchParams.get('botId') ?? '';
  const { projectName } = usePublicSettings();
  const { effectiveToken, canUse: canUseSession, authReady, waitingForBridge, isLoading } = useMiniAppAuth();
  const { showToast } = useToast();

  const [loading, setLoading] = useState(true);
  const [savingBasic, setSavingBasic] = useState(false);
  const [savingProfile, setSavingProfile] = useState(false);
  const [revoking, setRevoking] = useState(false);
  const [name, setName] = useState('');
  const [username, setUsername] = useState('');
  const [description, setDescription] = useState('');
  const [aboutText, setAboutText] = useState('');
  const [botPicUrl, setBotPicUrl] = useState('');
  const [menuButtonUrl, setMenuButtonUrl] = useState('');
  const [menuButtonText, setMenuButtonText] = useState('App');
  const [tokenPrefix, setTokenPrefix] = useState('');
  const [newToken, setNewToken] = useState<string | null>(null);

  const canUse = Boolean(canUseSession && botId);

  const loadBot = useCallback(async () => {
    if (!canUse || !effectiveToken) return;
    setLoading(true);
    try {
      const bot = await fetchBot(botId, effectiveToken);
      setName(bot.name);
      setUsername(bot.username);
      setDescription(bot.description ?? '');
      setAboutText(bot.aboutText ?? '');
      setBotPicUrl(bot.botPicUrl ?? '');
      setTokenPrefix(bot.tokenPrefix ?? '');

      const menuButton = parseComposerMenuButtonJson(bot.menuButtonJson);
      if (menuButton) {
        setMenuButtonUrl(menuButton.web_app.url);
        setMenuButtonText(menuButton.text);
      } else {
        setMenuButtonUrl('');
        setMenuButtonText('App');
      }
    } catch (error) {
      showToast(getApiErrorMessage(error, 'Не удалось загрузить бота') ?? 'Ошибка');
    } finally {
      setLoading(false);
    }
  }, [botId, canUse, effectiveToken, showToast]);

  useEffect(() => {
    void loadBot();
  }, [loadBot]);

  const usernameWithoutSuffix = useMemo(() => username.replace(/_bot$/i, ''), [username]);

  async function handleSaveBasic() {
    if (!canUse || !effectiveToken) return;
    setSavingBasic(true);
    try {
      const bot = await updateManagedBot(
        botId,
        {
          name: name.trim(),
          username: usernameWithoutSuffix.trim()
        },
        effectiveToken
      );
      setName(bot.name);
      setUsername(bot.username);
      showToast('Основные настройки сохранены');
    } catch (error) {
      showToast(getApiErrorMessage(error, 'Не удалось сохранить настройки') ?? 'Ошибка');
    } finally {
      setSavingBasic(false);
    }
  }

  async function handleSaveProfile() {
    if (!canUse || !effectiveToken) return;
    setSavingProfile(true);
    try {
      const bot = await updateManagedBotProfile(
        botId,
        {
          description: description.trim(),
          aboutText: aboutText.trim(),
          botPicUrl: botPicUrl.trim(),
          menuButtonUrl: menuButtonUrl.trim(),
          menuButtonText: menuButtonText.trim() || 'App'
        },
        effectiveToken
      );
      setDescription(bot.description ?? '');
      setAboutText(bot.aboutText ?? '');
      setBotPicUrl(bot.botPicUrl ?? '');
      const menuButton = parseComposerMenuButtonJson(bot.menuButtonJson);
      if (menuButton) {
        setMenuButtonUrl(menuButton.web_app.url);
        setMenuButtonText(menuButton.text);
      }
      showToast('Профиль бота обновлён');
    } catch (error) {
      showToast(getApiErrorMessage(error, 'Не удалось обновить профиль') ?? 'Ошибка');
    } finally {
      setSavingProfile(false);
    }
  }

  async function handleRevokeToken() {
    if (!canUse || !effectiveToken) return;
    setRevoking(true);
    try {
      const response = await revokeManagedBotToken(botId, effectiveToken);
      setNewToken(response.token ?? null);
      setTokenPrefix(response.bot?.tokenPrefix ?? tokenPrefix);
      showToast('Токен перевыпущен');
    } catch (error) {
      showToast(getApiErrorMessage(error, 'Не удалось перевыпустить токен') ?? 'Ошибка');
    } finally {
      setRevoking(false);
    }
  }

  async function copyToken() {
    if (!newToken) return;
    await navigator.clipboard.writeText(newToken);
    showToast('Токен скопирован');
  }

  if (!botId) {
    return <div className="flex min-h-screen items-center justify-center p-6 text-sm text-[#667085]">Не указан botId</div>;
  }

  if (isLoading && !effectiveToken) {
    return (
      <div className="flex min-h-screen items-center justify-center p-6 text-center text-sm text-[#667085]">
        <Loader2 className="mr-2 h-4 w-4 animate-spin" />
        Загрузка...
      </div>
    );
  }

  if ((waitingForBridge || !authReady) && !effectiveToken) {
    return (
      <div className="flex min-h-screen items-center justify-center p-6 text-center text-sm text-[#667085]">
        <Loader2 className="mr-2 h-4 w-4 animate-spin" />
        Загрузка...
      </div>
    );
  }

  if (!canUse) {
    return (
      <div className="flex min-h-screen items-center justify-center p-6 text-center text-sm text-[#667085]">
        Войдите в {projectName}, чтобы управлять ботом
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-[#f4f5f8] p-4 pb-8">
      <div className="mx-auto max-w-lg space-y-4">
        <div className="rounded-[24px] bg-white p-5 shadow-sm">
          <div className="flex items-start gap-3">
            {onBack ? (
              <Button type="button" variant="ghost" size="icon" className="mt-0.5 h-9 w-9 shrink-0" onClick={onBack}>
                <ArrowLeft className="h-5 w-5" />
              </Button>
            ) : null}
            <div>
              <h1 className="text-lg font-semibold">Настройки бота</h1>
              <p className="text-sm text-[#667085]">
                {botHint ? `@${botHint.replace(/_bot$/i, '')}_bot · ` : ''}
                Полное управление как в BotFather
              </p>
            </div>
          </div>
        </div>

        {loading ? (
          <div className="flex items-center justify-center gap-2 rounded-[24px] bg-white p-8 text-sm text-[#667085] shadow-sm">
            <Loader2 className="h-4 w-4 animate-spin" />
            Загрузка...
          </div>
        ) : (
          <>
            <div className="space-y-4 rounded-[24px] bg-white p-5 shadow-sm">
              <SectionCard icon={UserCircle2} title="Основное" description="Название и username бота (/newbot)">
                <div className="space-y-2">
                  <label className="text-sm font-medium">Название</label>
                  <Input value={name} onChange={(event) => setName(event.target.value)} className="rounded-xl" />
                </div>
                <div className="space-y-2">
                  <label className="text-sm font-medium">Username</label>
                  <div className="flex items-center gap-2">
                    <span className="text-sm text-[#667085]">@</span>
                    <Input
                      value={usernameWithoutSuffix}
                      onChange={(event) => setUsername(`${event.target.value.replace(/_bot$/i, '')}_bot`)}
                      className="rounded-xl"
                    />
                  </div>
                </div>
                <Button className="w-full rounded-xl" disabled={savingBasic} onClick={() => void handleSaveBasic()}>
                  {savingBasic ? <Loader2 className="mr-2 h-4 w-4 animate-spin" /> : null}
                  Сохранить основное
                </Button>
              </SectionCard>
            </div>

            <div className="space-y-4 rounded-[24px] bg-white p-5 shadow-sm">
              <SectionCard
                icon={TextQuote}
                title="Профиль"
                description="Описание и краткий текст — /setdescription и /setabouttext"
              >
                <FieldTextarea
                  label="Описание (/setdescription)"
                  hint="Показывается пользователю перед началом диалога"
                  value={description}
                  onChange={setDescription}
                  maxLength={512}
                  rows={4}
                />
                <FieldTextarea
                  label="О боте (/setabouttext)"
                  hint="Краткое описание на странице профиля бота"
                  value={aboutText}
                  onChange={setAboutText}
                  maxLength={120}
                  rows={2}
                />
              </SectionCard>

              <SectionCard icon={ImageIcon} title="Аватар" description="URL изображения — /setuserpic">
                <div className="space-y-3">
                  <Input
                    value={botPicUrl}
                    onChange={(event) => setBotPicUrl(event.target.value)}
                    placeholder="https://cdn.example.com/avatar.png"
                    className="rounded-xl"
                  />
                  {botPicUrl.trim() ? (
                    // eslint-disable-next-line @next/next/no-img-element
                    <img
                      src={botPicUrl.trim()}
                      alt="Аватар бота"
                      className="h-16 w-16 rounded-full border border-[#dce3ec] object-cover"
                      onError={(event) => {
                        event.currentTarget.style.display = 'none';
                      }}
                    />
                  ) : null}
                </div>
              </SectionCard>

              <SectionCard
                icon={LayoutGrid}
                title="Кнопка меню"
                description="Глобальная Web App-кнопка слева от поля ввода — /setmenubutton"
              >
                <div className="space-y-2">
                  <label className="text-sm font-medium">URL Mini App</label>
                  <Input
                    value={menuButtonUrl}
                    onChange={(event) => setMenuButtonUrl(event.target.value)}
                    placeholder="https://app.example.com/webapp"
                    className="rounded-xl"
                  />
                </div>
                <div className="space-y-2">
                  <label className="text-sm font-medium">Текст кнопки</label>
                  <Input
                    value={menuButtonText}
                    onChange={(event) => setMenuButtonText(event.target.value)}
                    placeholder="App"
                    className="rounded-xl"
                  />
                </div>
                <p className="text-xs text-[#667085]">Оставьте URL пустым, чтобы сбросить кнопку меню.</p>
              </SectionCard>

              <Button className="w-full rounded-xl" disabled={savingProfile} onClick={() => void handleSaveProfile()}>
                {savingProfile ? <Loader2 className="mr-2 h-4 w-4 animate-spin" /> : null}
                Сохранить профиль
              </Button>
            </div>

            <div className="space-y-4 rounded-[24px] bg-white p-5 shadow-sm">
              <h2 className="font-semibold">Токен Bot API</h2>
              <div className="rounded-2xl bg-[#f4f5f8] px-3 py-3 text-sm text-[#667085]">
                Текущий префикс: <span className="font-mono text-[#1f2430]">{tokenPrefix || '—'}…</span>
              </div>
              {newToken ? (
                <div className="space-y-2 rounded-2xl border border-[#dce3ec] p-3">
                  <p className="text-sm font-medium text-red-600">Сохраните новый токен — он больше не будет показан</p>
                  <div className="flex items-center gap-2">
                    <Input value={newToken} readOnly className="rounded-xl font-mono text-xs" />
                    <Button type="button" variant="secondary" className="rounded-xl" onClick={() => void copyToken()}>
                      <Copy className="h-4 w-4" />
                    </Button>
                  </div>
                </div>
              ) : null}
              <Button variant="secondary" className="w-full rounded-xl" disabled={revoking} onClick={() => void handleRevokeToken()}>
                {revoking ? <Loader2 className="mr-2 h-4 w-4 animate-spin" /> : <RefreshCw className="mr-2 h-4 w-4" />}
                Перевыпустить токен
              </Button>
            </div>

            <div className="rounded-[20px] border border-dashed border-[#dce3ec] bg-white/70 p-4 text-xs leading-relaxed text-[#667085]">
              <p className="mb-2 font-medium text-[#1f2430]">Эквивалент команд BotFather</p>
              <ul className="space-y-1">
                <li>/setdescription — поле «Описание»</li>
                <li>/setabouttext — поле «О боте»</li>
                <li>/setuserpic — URL аватара</li>
                <li>/setmenubutton — URL и текст кнопки меню</li>
              </ul>
            </div>
          </>
        )}
      </div>
    </div>
  );
}