'use client';

import * as React from 'react';
import Link from 'next/link';
import { Check, Loader2, Monitor, Moon, Sun } from 'lucide-react';
import { useTheme } from 'next-themes';
import { toast } from 'sonner';
import { Button } from '@/components/ui/button';
import { useCustomTheme } from '@/lib/theme';
import { cn } from '@/lib/utils';
import { LanguageSwitcher } from '@/components/common/language-switcher';
import { useTranslations } from 'next-intl';
import {
  Breadcrumb,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbList,
  BreadcrumbPage,
  BreadcrumbSeparator,
} from '@/components/ui/breadcrumb';

function ThemeModeSection() {
  const { theme, setTheme } = useTheme();
  const t = useTranslations('settings.appearance');
  const [mounted, setMounted] = React.useState(false);

  React.useEffect(() => {
    setMounted(true);
  }, []);

  const modes = [
    { id: 'light', name: t('modeLight'), icon: Sun },
    { id: 'dark', name: t('modeDark'), icon: Moon },
    { id: 'system', name: t('modeSystem'), icon: Monitor },
  ];

  if (!mounted) {
    return (
      <div className='space-y-6'>
        <div>
          <h2 className='font-medium text-sm text-foreground'>
            {t('themeMode')}
          </h2>
          <p className='text-xs text-muted-foreground'>{t('themeModeDesc')}</p>
        </div>
        <div className='flex gap-2'>
          {modes.map((mode) => {
            const Icon = mode.icon;
            return (
              <Button
                key={mode.id}
                variant='secondary'
                size='sm'
                className='flex-1 text-xs'
              >
                {Icon && <Icon className='size-3 mr-1' />}
                {mode.name}
              </Button>
            );
          })}
        </div>
      </div>
    );
  }

  return (
    <div className='space-y-6'>
      <div>
        <h2 className='font-medium text-sm text-foreground'>
          {t('themeMode')}
        </h2>
        <p className='text-xs text-muted-foreground'>{t('themeModeDesc')}</p>
      </div>

      <div className='flex gap-2'>
        {modes.map((mode) => {
          const Icon = mode.icon;
          const isActive = theme === mode.id;

          return (
            <Button
              key={mode.id}
              variant={isActive ? 'default' : 'secondary'}
              size='sm'
              onClick={() => setTheme(mode.id)}
              className='flex-1 text-xs'
            >
              {Icon && <Icon className='size-3 mr-1' />}
              {mode.name}
            </Button>
          );
        })}
      </div>
    </div>
  );
}

function InterfaceAppearanceSection() {
  const {
    themes,
    currentThemeId,
    setTheme: setCustomTheme,
    isLoading,
  } = useCustomTheme();
  const { theme: mode } = useTheme();
  const t = useTranslations('settings.appearance');
  const [mounted, setMounted] = React.useState(false);
  const [switching, setSwitching] = React.useState<string | null>(null);

  React.useEffect(() => {
    setMounted(true);
  }, []);

  const handleSetTheme = (themeId: string) => {
    if (switching === themeId) return;
    setSwitching(themeId);
    try {
      setCustomTheme(themeId);
      const themeName = themes.find((t) => t.id === themeId)?.name || themeId;
      toast.success(t('switched', { name: themeName }));
    } catch {
      toast.error(t('switchFailed'));
    } finally {
      setSwitching(null);
    }
  };

  const isDark =
    mounted &&
    (mode === 'dark' ||
      (mode === 'system' &&
        typeof window !== 'undefined' &&
        window.matchMedia('(prefers-color-scheme: dark)').matches));

  return (
    <div className='space-y-6'>
      <div>
        <h2 className='font-medium text-sm text-foreground'>
          {t('interface')}
        </h2>
        <p className='text-xs text-muted-foreground'>{t('interfaceDesc')}</p>
      </div>

      <div>
        {isLoading ? (
          <div className='flex items-center justify-center p-12'>
            <Loader2 className='h-8 w-8 animate-spin text-muted-foreground/50' />
          </div>
        ) : (
          <div className='grid grid-cols-2 xs:grid-cols-3 sm:grid-cols-4 lg:grid-cols-5 xl:grid-cols-6 gap-6'>
            {themes.map((theme) => {
              const isActive =
                currentThemeId === theme.id ||
                (!currentThemeId && theme.id === 'default.css');
              const isSwitching = switching === theme.id;
              const colors = isDark ? theme.colors.dark : theme.colors.light;

              return (
                <div
                  key={theme.id}
                  onClick={() => handleSetTheme(theme.id)}
                  className={cn(
                    'group relative cursor-pointer rounded-xl border transition-all overflow-hidden',
                    isActive
                      ? 'border-primary ring-2 ring-primary/20'
                      : 'border-border hover:border-border/50 hover:shadow-md',
                  )}
                >
                  <div
                    className='aspect-[4/3] w-full relative'
                    style={{
                      backgroundColor:
                        colors.background || colors['background'],
                    }}
                  >
                    <div className='flex h-full p-2 gap-2'>
                      <div
                        className='w-1/4 h-full rounded-sm opacity-80'
                        style={{
                          backgroundColor: colors.sidebar || colors['sidebar'],
                        }}
                      />
                      <div className='flex-1 space-y-1.5 pt-1'>
                        <div
                          className='h-1.5 w-1/3 rounded-full opacity-90'
                          style={{
                            backgroundColor:
                              colors.primary || colors['primary'],
                          }}
                        />
                        <div
                          className='h-8 w-full rounded-sm opacity-40'
                          style={{
                            backgroundColor:
                              colors.sidebar || colors['sidebar'],
                          }}
                        />
                        <div
                          className='h-4 w-1/2 rounded-sm opacity-30'
                          style={{
                            backgroundColor:
                              colors.sidebar || colors['sidebar'],
                          }}
                        />
                      </div>
                    </div>

                    {isActive && !isSwitching && (
                      <div className='absolute top-2 right-2 z-10 bg-primary text-primary-foreground rounded-full p-0.5 shadow-sm'>
                        <Check className='h-3 w-3' />
                      </div>
                    )}
                  </div>

                  <div className='p-2 border-t border-border/50 bg-card'>
                    <div
                      className={cn(
                        'text-[10px] font-medium text-center truncate transition-colors',
                        isActive ? 'text-primary' : 'text-muted-foreground',
                      )}
                    >
                      {theme.name}
                    </div>
                  </div>
                </div>
              );
            })}
          </div>
        )}
      </div>
    </div>
  );
}

export function AppearanceMain() {
  const t = useTranslations('settings');
  const ta = useTranslations('settings.appearance');

  return (
    <div className='py-6 space-y-6'>
      <div className='font-semibold'>
        <Breadcrumb>
          <BreadcrumbList>
            <BreadcrumbItem>
              <BreadcrumbLink asChild>
                <Link href='/settings' className='text-base text-primary'>
                  {t('title')}
                </Link>
              </BreadcrumbLink>
            </BreadcrumbItem>
            <BreadcrumbSeparator />
            <BreadcrumbItem>
              <BreadcrumbPage className='text-base font-semibold'>
                {ta('breadcrumb')}
              </BreadcrumbPage>
            </BreadcrumbItem>
          </BreadcrumbList>
        </Breadcrumb>
      </div>

      <ThemeModeSection />

      <div className='space-y-6'>
        <div>
          <h2 className='font-medium text-sm text-foreground'>
            {ta('language')}
          </h2>
          <p className='text-xs text-muted-foreground'>{ta('languageDesc')}</p>
        </div>
        <LanguageSwitcher variant='full' />
      </div>

      <InterfaceAppearanceSection />

      <div className='space-y-4 opacity-50 pointer-events-none grayscale'>
        <h2 className='font-medium text-sm text-muted-foreground'>
          {ta('comingSoon')}
        </h2>
        <div className='bg-muted/30 rounded-xl p-6 h-32 flex items-center justify-center border border-border/50'>
          <span className='text-sm text-muted-foreground'>
            {ta('comingSoonBody')}
          </span>
        </div>
      </div>
    </div>
  );
}