import React, { useEffect, useState } from 'react'
import { Helmet } from 'react-helmet'
import navigationIcon from '@/proxy/menus/navigation-icon.config'
import { AboutDto } from '@/proxy/about/models'
import { getAbout, saveAboutPage } from '@/services/about'
import { useLocalization } from '@/utils/hooks/useLocalization'
import Loading from '@/components/shared/Loading'
import { APP_NAME } from '@/constants/app.constant'
import { ROUTES_ENUM } from '@/routes/route.constant'
import { useStoreState } from '@/store'
import { useStoreActions } from '@/store'
import { useNavigate } from 'react-router-dom'
import DesignerDrawer from './designer/DesignerDrawer'
import SelectableBlock from './designer/SelectableBlock'
import { DesignerSelection } from './designer/types'
import { useDesignerState } from './designer/useDesignerState'

interface AboutStatContent {
  icon: string
  value: string
  label: string
  labelKey: string
  useCounter?: boolean
  counterEnd?: string
  counterSuffix?: string
  counterDuration?: number
}

interface AboutDescriptionContent {
  key: string
  text: string
}

interface AboutSectionContent {
  title: string
  description: string
  titleKey: string
  descriptionKey: string
}

interface AboutContent {
  heroTitle: string
  heroTitleKey: string
  heroSubtitle: string
  heroSubtitleKey: string
  heroImage: string
  heroImageKey: string
  stats: AboutStatContent[]
  descriptions: AboutDescriptionContent[]
  sections: AboutSectionContent[]
}

const ABOUT_HERO_IMAGE =
  'https://images.pexels.com/photos/3183183/pexels-photo-3183183.jpeg?auto=compress&cs=tinysrgb&w=1920'
const ABOUT_HERO_TITLE_KEY = 'App.About'
const ABOUT_HERO_SUBTITLE_KEY = 'Public.about.subtitle'
const ABOUT_HERO_IMAGE_KEY = 'Public.about.heroImage'

function isLikelyLocalizationKey(value?: string) {
  return Boolean(value && /^[A-Za-z0-9_.-]+$/.test(value) && value.includes('.'))
}

function resolveLocalizedValue(
  translate: (key: string) => string,
  keyOrValue: string | undefined,
  fallback = '',
) {
  if (!keyOrValue) {
    return fallback
  }

  if (!isLikelyLocalizationKey(keyOrValue)) {
    return keyOrValue
  }

  const translatedValue = translate('::' + keyOrValue)
  return translatedValue === keyOrValue ? fallback || keyOrValue : translatedValue
}

function buildAboutContent(
  about: AboutDto | undefined,
  translate: (key: string) => string,
): AboutContent {
  return {
    heroTitle: resolveLocalizedValue(translate, ABOUT_HERO_TITLE_KEY, 'About'),
    heroTitleKey: ABOUT_HERO_TITLE_KEY,
    heroSubtitle: resolveLocalizedValue(translate, ABOUT_HERO_SUBTITLE_KEY),
    heroSubtitleKey: ABOUT_HERO_SUBTITLE_KEY,
    heroImage: resolveLocalizedValue(translate, ABOUT_HERO_IMAGE_KEY, ABOUT_HERO_IMAGE),
    heroImageKey: ABOUT_HERO_IMAGE_KEY,
    stats:
      about?.statsDto.map((stat) => ({
        icon: stat.icon || '',
        value: stat.value,
        label: resolveLocalizedValue(translate, stat.labelKey, stat.labelKey),
        labelKey:
          (isLikelyLocalizationKey(stat.labelKey) ? stat.labelKey : undefined) ||
          `Public.about.dynamic.stat.${stat.value}.label`,
        useCounter: stat.useCounter,
        counterEnd: stat.counterEnd,
        counterSuffix: stat.counterSuffix,
        counterDuration: stat.counterDuration,
      })) ?? [],
    descriptions:
      about?.descriptionsDto.map((item, index) => ({
        key:
          (isLikelyLocalizationKey(item) ? item : undefined) ||
          `Public.about.dynamic.description.${index + 1}`,
        text: resolveLocalizedValue(translate, item, item),
      })) ?? [],
    sections:
      about?.sectionsDto.map((section) => ({
        title: resolveLocalizedValue(translate, section.key, section.key),
        description: resolveLocalizedValue(translate, section.descKey, section.descKey),
        titleKey:
          (isLikelyLocalizationKey(section.key) ? section.key : undefined) ||
          `Public.about.dynamic.section.${section.key}.title`,
        descriptionKey:
          (isLikelyLocalizationKey(section.descKey) ? section.descKey : undefined) ||
          `Public.about.dynamic.section.${section.key}.description`,
      })) ?? [],
  }
}

const About: React.FC = () => {
  const { translate } = useLocalization()
  const navigate = useNavigate()
  const { setLang } = useStoreActions((actions) => actions.locale)
  const { getConfig } = useStoreActions((actions) => actions.abpConfig)
  const configCultureName = useStoreState(
    (state) => state.abpConfig.config?.localization.currentCulture.cultureName,
  )
  const localeCurrentLang = useStoreState((state) => state.locale?.currentLang)
  const currentLanguage = configCultureName || localeCurrentLang || 'tr'
  const abpLanguages = useStoreState((state) => state.abpConfig.config?.localization.languages) || []
  const languageOptions = abpLanguages
    .filter((language) => Boolean(language.cultureName))
    .map((language) => {
      const cultureName = language.cultureName || 'tr'
      return {
        key: cultureName.toLowerCase().split('-')[0],
        cultureName,
        displayName: language.displayName || cultureName,
      }
    })
  const languagesFromConfig = languageOptions.map((language) => language.key)
  const editorLanguages = Array.from(
    new Set((languagesFromConfig.length > 0 ? languagesFromConfig : [currentLanguage]).filter(Boolean)),
  )
  const [loading, setLoading] = useState(true)
  const [isSaving, setIsSaving] = useState(false)
  const [isPanelVisible, setIsPanelVisible] = useState(true)
  const [about, setAbout] = useState<AboutDto>()

  const iconColors = [
    'text-blue-600',
    'text-red-600',
    'text-green-600',
    'text-purple-600',
    'text-yellow-600',
    'text-indigo-600',
  ]

  function getIconColor(index: number) {
    return iconColors[index % iconColors.length]
  }

  const initialContent = !loading ? buildAboutContent(about, translate) : null
  const {
    content,
    isDesignMode,
    selectedBlockId,
    selectedLanguage,
    supportedLanguages,
    setContent,
    setSelectedBlockId,
    resetContent,
  } = useDesignerState<AboutContent>('about', initialContent, {
    currentLanguage,
    supportedLanguages: editorLanguages,
  })

  useEffect(() => {
    setLoading(true)
    const fetchServices = async () => {
      try {
        const result = await getAbout()
        setAbout(result.data)
      } catch (error) {
        console.error('About alınırken hata oluştu:', error)
      } finally {
        setLoading(false)
      }
    }
    fetchServices()
  }, [])

  const updateContent = (updater: (current: AboutContent) => AboutContent) => {
    setContent((current) => {
      if (!current) {
        return current
      }

      return updater(current)
    })
  }

  const handleFieldChange = (fieldKey: string, value: string | string[]) => {
    updateContent((current) => {
      if (fieldKey === 'heroTitle' || fieldKey === 'heroSubtitle' || fieldKey === 'heroImage') {
        return {
          ...current,
          [fieldKey]: value as string,
        }
      }

      if (fieldKey.startsWith('description-')) {
        const index = Number(fieldKey.replace('description-', ''))
        const descriptions = [...current.descriptions]
        descriptions[index] = {
          ...descriptions[index],
          text: value as string,
        }

        return {
          ...current,
          descriptions,
        }
      }

      if (selectedBlockId?.startsWith('stat-')) {
        const index = Number(selectedBlockId.replace('stat-', ''))
        const stats = [...current.stats]
        stats[index] = {
          ...stats[index],
          [fieldKey]: value as string,
        }

        return {
          ...current,
          stats,
        }
      }

      if (selectedBlockId?.startsWith('section-')) {
        const index = Number(selectedBlockId.replace('section-', ''))
        const sections = [...current.sections]
        sections[index] = {
          ...sections[index],
          [fieldKey]: value as string,
        }

        return {
          ...current,
          sections,
        }
      }

      return current
    })
  }

  const selectedSelection: DesignerSelection | null = React.useMemo(() => {
    if (!content || !selectedBlockId) {
      return null
    }

    if (selectedBlockId === 'hero') {
      return {
        id: 'hero',
        title: content.heroTitleKey,
        description: 'Baslik, alt baslik ve arka plan gorselini guncelleyin.',
        fields: [
          {
            key: 'heroTitle',
            label: content.heroTitleKey,
            type: 'text',
            value: content.heroTitle,
          },
          {
            key: 'heroSubtitle',
            label: content.heroSubtitleKey,
            type: 'textarea',
            value: content.heroSubtitle,
          },
          {
            key: 'heroImage',
            label: content.heroImageKey,
            type: 'image',
            value: content.heroImage,
          },
        ],
      }
    }

    if (selectedBlockId === 'descriptions') {
      return {
        id: 'descriptions',
        title: 'Public.about.description.*',
        description: 'Orta bolumdeki aciklama metinlerini duzenleyin.',
        fields: content.descriptions.map((item, index) => ({
          key: `description-${index}`,
          label: item.key || `Public.about.dynamic.description.${index + 1}`,
          type: 'textarea',
          value: item.text,
          rows: index % 2 === 0 ? 4 : 3,
        })),
      }
    }

    if (selectedBlockId.startsWith('stat-')) {
      const index = Number(selectedBlockId.replace('stat-', ''))
      const stat = content.stats[index]

      if (!stat) {
        return null
      }

      return {
        id: selectedBlockId,
        title: stat.labelKey,
        description: translate('::Public.designer.desc1'),
        fields: [
          {
            key: 'icon',
            label: translate('::Public.designer.ikonAnahtari'),
            type: 'icon',
            value: stat.icon,
            placeholder: 'Ornek: FaUsers',
          },
          { 
            key: 'value', 
            label: translate('::Public.designer.value'), 
            type: 'text', 
            value: stat.value 
          },
          {
            key: 'label',
            label: translate('::' + stat.labelKey),
            type: 'text',
            value: stat.label,
          },
        ],
      }
    }

    if (selectedBlockId.startsWith('section-')) {
      const index = Number(selectedBlockId.replace('section-', ''))
      const section = content.sections[index]

      if (!section) {
        return null
      }

      return {
        id: selectedBlockId,
        title: section.titleKey,
        description: 'Kart basligi ve aciklama metnini duzenleyin.',
        fields: [
          {
            key: 'title',
            label: section.titleKey,
            type: 'text',
            value: section.title,
          },
          {
            key: 'description',
            label: section.descriptionKey,
            type: 'textarea',
            value: section.description,
          },
        ],
      }
    }

    return null
  }, [content, selectedBlockId])

  const handleSaveAndExit = async () => {
    if (!content || isSaving) {
      return
    }

    setIsSaving(true)

    try {
      await saveAboutPage({
        cultureName: selectedLanguage,
        heroTitleKey: content.heroTitleKey,
        heroTitleValue: content.heroTitle,
        heroSubtitleKey: content.heroSubtitleKey,
        heroSubtitleValue: content.heroSubtitle,
        heroImageKey: content.heroImageKey,
        heroImageValue: content.heroImage,
        stats: content.stats.map((stat, index) => ({
          icon: stat.icon,
          value: stat.value,
          labelKey: stat.labelKey || `Public.about.dynamic.stat.${index + 1}.label`,
          labelValue: stat.label,
          useCounter: stat.useCounter,
          counterEnd: stat.counterEnd,
          counterSuffix: stat.counterSuffix,
          counterDuration: stat.counterDuration,
        })),
        descriptions: content.descriptions.map((item, index) => ({
          key: item.key || `Public.about.dynamic.description.${index + 1}`,
          value: item.text,
        })),
        sections: content.sections.map((section, index) => ({
          titleKey: section.titleKey || `Public.about.dynamic.section.${index + 1}.title`,
          titleValue: section.title,
          descriptionKey:
            section.descriptionKey || `Public.about.dynamic.section.${index + 1}.description`,
          descriptionValue: section.description,
        })),
      })

      await getConfig(false)
      setSelectedBlockId(null)
      navigate(ROUTES_ENUM.public.about, { replace: true })
    } catch (error) {
      console.error('About tasarimi kaydedilemedi:', error)
    } finally {
      setIsSaving(false)
    }
  }

  const handleLanguageChange = (language: string) => {
    // Global locale changes asynchronously fetch fresh localization texts.
    // Keep designer language synced from store after that refresh.
    setLang(language)
  }

  const handleSelectBlock = (blockId: string) => {
    setSelectedBlockId(blockId)
    if (!isPanelVisible) {
      setIsPanelVisible(true)
    }
  }

  if (loading) {
    return (
      <div className="flex items-center justify-center min-h-screen bg-gray-50">
        <div className="text-center">
          <Loading loading={loading} />
        </div>
      </div>
    )
  }

  return (
    <>
      <Helmet
        titleTemplate={`%s | ${APP_NAME}`}
        title={translate('::App.About')}
        defaultTitle={APP_NAME}
      ></Helmet>

      <div className={`min-h-screen bg-gray-50 ${isDesignMode && isPanelVisible ? 'xl:pr-[420px]' : ''}`}>
        {isDesignMode && !isPanelVisible && (
          <button
            type="button"
            onClick={() => setIsPanelVisible(true)}
            className="fixed right-4 top-1/2 z-40 -translate-y-1/2 rounded-full bg-slate-900 px-4 py-2 text-sm font-semibold text-white shadow-xl"
          >
            {translate('::Public.designer.showPanel')}
          </button>
        )}

        {/* Hero Section */}
        <SelectableBlock
          id="hero"
          isActive={selectedBlockId === 'hero'}
          isDesignMode={isDesignMode}
          onSelect={handleSelectBlock}
        >
          <div className="relative bg-blue-900 text-white py-12">
            <div
              className="absolute inset-0 opacity-20"
              style={{
                backgroundImage: `url("${content?.heroImage ?? ABOUT_HERO_IMAGE}")`,
                backgroundSize: 'cover',
                backgroundPosition: 'center',
              }}
            ></div>
            <div className="container mx-auto pt-20 relative">
              <h1 className="text-5xl font-bold ml-4 mt-3 mb-2 text-white">
                {content?.heroTitle}
              </h1>
              <p className="text-xl max-w-3xl ml-4">{content?.heroSubtitle}</p>
            </div>
          </div>
        </SelectableBlock>

        {/* Stats Section */}
        <div className="py-10 bg-white">
          <div className="container mx-auto px-4">
            <div className="grid grid-cols-1 md:grid-cols-4 gap-8">
              {content?.stats.map((stat, index) => {
                const IconComponent = navigationIcon[stat.icon || '']

                return (
                  <SelectableBlock
                    key={index}
                    id={`stat-${index}`}
                    isActive={selectedBlockId === `stat-${index}`}
                    isDesignMode={isDesignMode}
                    onSelect={handleSelectBlock}
                  >
                    <div className="text-center rounded-xl px-4 py-6">
                      {IconComponent && (
                        <IconComponent
                          className={`w-12 h-12 mx-auto mb-4 ${getIconColor(index)}`}
                        />
                      )}
                      <div className="text-4xl font-bold text-gray-900 mb-2">{stat.value}</div>
                      <div className="text-gray-600">{stat.label}</div>
                    </div>
                  </SelectableBlock>
                )
              })}
            </div>
          </div>
        </div>

        {/* Main Content */}
        <div className="py-6">
          <div className="container mx-auto px-4">
            <div className="mb-6">
              <SelectableBlock
                id="descriptions"
                isActive={selectedBlockId === 'descriptions'}
                isDesignMode={isDesignMode}
                onSelect={handleSelectBlock}
              >
                <div className="p-5 mx-auto mx-auto text-gray-800 text-lg leading-relaxed shadow-md bg-white border-l-4 border-blue-600">
                  <p>{content?.descriptions[0]?.text}</p>
                  <p className="text-center p-5 text-blue-800">{content?.descriptions[1]?.text}</p>
                  <p>{content?.descriptions[2]?.text}</p>
                  <p className="text-center p-5 text-blue-800">{content?.descriptions[3]?.text}</p>
                </div>
              </SelectableBlock>
            </div>

            <div className="grid grid-cols-1 lg:grid-cols-2 gap-12">
              {content?.sections.map((section, index) => (
                <SelectableBlock
                  key={index}
                  id={`section-${index}`}
                  isActive={selectedBlockId === `section-${index}`}
                  isDesignMode={isDesignMode}
                  onSelect={handleSelectBlock}
                >
                  <div className="bg-white p-8 rounded-xl shadow-lg">
                    <h3 className="text-2xl font-bold text-gray-900 mb-4">{section.title}</h3>
                    <p className="text-gray-700">{section.description}</p>
                  </div>
                </SelectableBlock>
              ))}
            </div>
          </div>
        </div>

        <DesignerDrawer
          isOpen={isDesignMode && isPanelVisible}
          selection={selectedSelection}
          pageTitle="About"
          selectedLanguage={selectedLanguage}
          languages={
            languageOptions.length > 0
              ? languageOptions
              : supportedLanguages.map((language) => ({
                  key: language,
                  cultureName: language,
                  displayName: language.toUpperCase(),
                }))
          }
          onClose={() => setIsPanelVisible(false)}
          onSave={handleSaveAndExit}
          onLanguageChange={handleLanguageChange}
          onReset={resetContent}
          onFieldChange={handleFieldChange}
        />
      </div>
    </>
  )
}

export default About