'use client'

import { useState, useEffect } from 'react'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from '@/components/ui/card'
import { Label } from '@/components/ui/label'
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select'
import { updateProfile, changePassword, updateLanguage, updateFontSize } from '@/app/actions/profile'
import { toast } from 'sonner'
import { useLanguage } from '@/lib/i18n'

const LANGUAGES = [
  { value: 'auto', label: 'Auto-detect', flag: '🌐' },
  { value: 'en', label: 'English', flag: '🇬🇧' },
  { value: 'fr', label: 'Français', flag: '🇫🇷' },
  { value: 'es', label: 'Español', flag: '🇪🇸' },
  { value: 'de', label: 'Deutsch', flag: '🇩🇪' },
  { value: 'it', label: 'Italiano', flag: '🇮🇹' },
  { value: 'pt', label: 'Português', flag: '🇵🇹' },
  { value: 'ru', label: 'Русский', flag: '🇷🇺' },
  { value: 'zh', label: '中文', flag: '🇨🇳' },
  { value: 'ja', label: '日本語', flag: '🇯🇵' },
  { value: 'ko', label: '한국어', flag: '🇰🇷' },
  { value: 'ar', label: 'العربية', flag: '🇸🇦' },
  { value: 'hi', label: 'हिन्दी', flag: '🇮🇳' },
  { value: 'nl', label: 'Nederlands', flag: '🇳🇱' },
  { value: 'pl', label: 'Polski', flag: '🇵🇱' },
  { value: 'fa', label: 'فارسی (Persian)', flag: '🇮🇷' },
]

export function ProfileForm({ user, userAISettings }: { user: any; userAISettings?: any }) {
  const [selectedLanguage, setSelectedLanguage] = useState(userAISettings?.preferredLanguage || 'auto')
  const [isUpdatingLanguage, setIsUpdatingLanguage] = useState(false)
  const [fontSize, setFontSize] = useState(userAISettings?.fontSize || 'medium')
  const [isUpdatingFontSize, setIsUpdatingFontSize] = useState(false)
  const { t } = useLanguage()

  const FONT_SIZES = [
    { value: 'small', label: t('profile.fontSizeSmall'), size: '14px' },
    { value: 'medium', label: t('profile.fontSizeMedium'), size: '16px' },
    { value: 'large', label: t('profile.fontSizeLarge'), size: '18px' },
    { value: 'extra-large', label: t('profile.fontSizeExtraLarge'), size: '20px' },
  ]

  const handleFontSizeChange = async (size: string) => {
    setIsUpdatingFontSize(true)
    try {
      const result = await updateFontSize(size)
      if (result?.error) {
        toast.error(t('profile.fontSizeUpdateFailed'))
      } else {
        setFontSize(size)
        // Apply font size immediately
        applyFontSize(size)
        toast.success(t('profile.fontSizeUpdateSuccess'))
      }
    } catch (error) {
      toast.error(t('profile.fontSizeUpdateFailed'))
    } finally {
      setIsUpdatingFontSize(false)
    }
  }

  const applyFontSize = (size: string) => {
    // Base font size in pixels (16px is standard)
    const fontSizeMap = {
      'small': '14px',    // ~87% of 16px
      'medium': '16px',   // 100% (standard)
      'large': '18px',    // ~112% of 16px
      'extra-large': '20px' // 125% of 16px
    }
    const fontSizeFactorMap = {
      'small': 0.95,
      'medium': 1.0,
      'large': 1.1,
      'extra-large': 1.25
    }
    const fontSizeValue = fontSizeMap[size as keyof typeof fontSizeMap] || '16px'
    const fontSizeFactor = fontSizeFactorMap[size as keyof typeof fontSizeFactorMap] || 1.0

    document.documentElement.style.setProperty('--user-font-size', fontSizeValue)
    document.documentElement.style.setProperty('--user-font-size-factor', fontSizeFactor.toString())
    localStorage.setItem('user-font-size', size)
  }

  // Apply saved font size on mount
  useEffect(() => {
    const savedFontSize = localStorage.getItem('user-font-size') || userAISettings?.fontSize || 'medium'
    applyFontSize(savedFontSize as string)
  }, [])

  const handleLanguageChange = async (language: string) => {
    setIsUpdatingLanguage(true)
    try {
      const result = await updateLanguage(language)
      if (result?.error) {
        toast.error(t('profile.languageUpdateFailed'))
      } else {
        setSelectedLanguage(language)
        // Update localStorage and reload to apply new language
        localStorage.setItem('user-language', language)
        toast.success(t('profile.languageUpdateSuccess'))
        // Reload page to apply new language
        setTimeout(() => window.location.reload(), 500)
      }
    } catch (error) {
      toast.error(t('profile.languageUpdateFailed'))
    } finally {
      setIsUpdatingLanguage(false)
    }
  }

  return (
    <div className="space-y-6">
      <Card>
        <CardHeader>
          <CardTitle>{t('profile.title')}</CardTitle>
          <CardDescription>{t('profile.description')}</CardDescription>
        </CardHeader>
        <form action={async (formData) => {
          const result = await updateProfile({ name: formData.get('name') as string })
          if (result?.error) {
            toast.error(t('profile.updateFailed'))
          } else {
            toast.success(t('profile.updateSuccess'))
          }
        }}>
          <CardContent className="space-y-4">
            <div className="space-y-2">
              <label htmlFor="name" className="text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70">{t('profile.displayName')}</label>
              <Input id="name" name="name" defaultValue={user.name} />
            </div>
            <div className="space-y-2">
              <label htmlFor="email" className="text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70">{t('profile.email')}</label>
              <Input id="email" value={user.email} disabled className="bg-muted" />
            </div>
          </CardContent>
          <CardFooter>
            <Button type="submit">{t('general.save')}</Button>
          </CardFooter>
        </form>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle>{t('profile.languagePreferences')}</CardTitle>
          <CardDescription>{t('profile.languagePreferencesDescription')}</CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="space-y-2">
            <Label htmlFor="language">{t('profile.preferredLanguage')}</Label>
            <Select
              value={selectedLanguage}
              onValueChange={handleLanguageChange}
              disabled={isUpdatingLanguage}
            >
              <SelectTrigger id="language">
                <SelectValue placeholder={t('profile.selectLanguage')} />
              </SelectTrigger>
              <SelectContent>
                {LANGUAGES.map((lang) => (
                  <SelectItem key={lang.value} value={lang.value}>
                    <span className="flex items-center gap-2">
                      <span>{lang.flag}</span>
                      <span>{lang.label}</span>
                    </span>
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
            <p className="text-sm text-muted-foreground">
              {t('profile.languageDescription')}
            </p>
          </div>
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle>{t('profile.displaySettings')}</CardTitle>
          <CardDescription>{t('profile.displaySettingsDescription')}</CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="space-y-2">
            <Label htmlFor="fontSize">{t('profile.fontSize')}</Label>
            <Select
              value={fontSize}
              onValueChange={handleFontSizeChange}
              disabled={isUpdatingFontSize}
            >
              <SelectTrigger id="fontSize">
                <SelectValue placeholder={t('profile.selectFontSize')} />
              </SelectTrigger>
              <SelectContent>
                {FONT_SIZES.map((size) => (
                  <SelectItem key={size.value} value={size.value}>
                    <span className="flex items-center gap-2">
                      <span>{size.label}</span>
                      <span className="text-xs text-muted-foreground">({size.size})</span>
                    </span>
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
            <p className="text-sm text-muted-foreground">
              {t('profile.fontSizeDescription')}
            </p>
          </div>
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle>{t('profile.changePassword')}</CardTitle>
          <CardDescription>{t('profile.changePasswordDescription')}</CardDescription>
        </CardHeader>
        <form action={async (formData) => {
          const result = await changePassword(formData)
          if (result?.error) {
            const msg = '_form' in result.error
              ? result.error._form[0]
              : result.error.currentPassword?.[0] || result.error.newPassword?.[0] || result.error.confirmPassword?.[0] || t('profile.passwordChangeFailed')
            toast.error(msg)
          } else {
            toast.success(t('profile.passwordChangeSuccess'))
            // Reset form manually or redirect
            const form = document.querySelector('form#password-form') as HTMLFormElement
            form?.reset()
          }
        }} id="password-form">
          <CardContent className="space-y-4">
            <div className="space-y-2">
              <label htmlFor="currentPassword" className="text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70">{t('profile.currentPassword')}</label>
              <Input id="currentPassword" name="currentPassword" type="password" required />
            </div>
            <div className="space-y-2">
              <label htmlFor="newPassword" className="text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70">{t('profile.newPassword')}</label>
              <Input id="newPassword" name="newPassword" type="password" required minLength={6} />
            </div>
            <div className="space-y-2">
              <label htmlFor="confirmPassword" className="text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70">{t('profile.confirmPassword')}</label>
              <Input id="confirmPassword" name="confirmPassword" type="password" required minLength={6} />
            </div>
          </CardContent>
          <CardFooter>
            <Button type="submit">{t('profile.updatePassword')}</Button>
          </CardFooter>
        </form>
      </Card>
    </div>
  )
}