import AsyncStorage from '@react-native-async-storage/async-storage'
import { useCallback, useMemo, useState } from 'react'
import { Image, StyleSheet, Text, TouchableOpacity, View } from 'react-native'
import { background, icons, videos } from '../assets'
import FullscreenIntroVideo from '../components/FullscreenIntroVideo'
import Page from '../layouts/Page'
import { Routes } from '../navigation'
import { navigate, reset } from '../navigation/NavigationService'
import { useUser } from '../providers/UserDataProvider'
import { Palette } from '../styles'
import { FONT_FAMILY } from '../styles/Fonts'

const LANGUAGE_STORAGE_KEY = 'preferredLanguage'
const FLOW_PHASE = {
  JINGLE: 'jingle',
  LANGUAGE: 'language',
  WELCOME_VIDEO: 'welcomeVideo',
}

export default function LandingPage({ route }) {
  const { currentUID } = useUser()
  const [phase, setPhase] = useState(() =>
    route?.params?.startAtLanguage ? FLOW_PHASE.LANGUAGE : FLOW_PHASE.JINGLE
  )
  const [selectedLanguage, setSelectedLanguage] = useState(null)
  const isAuthenticated = !!currentUID

  const openRegistration = useCallback(() => {
    navigate(Routes.Register)
  }, [])

  const openMainMenu = useCallback(() => {
    reset({
      index: 0,
      routes: [
        {
          name: Routes.BottomTab,
          params: {
            screen: Routes.HomeStack,
            params: { screen: Routes.Home },
          },
        },
      ],
    })
  }, [])

  const handleJingleClose = useCallback(() => {
    if (isAuthenticated) {
      openMainMenu()
      return
    }
    setPhase(FLOW_PHASE.LANGUAGE)
  }, [isAuthenticated, openMainMenu])

  const handleSelectLanguage = useCallback(async (language) => {
    try {
      await AsyncStorage.setItem(LANGUAGE_STORAGE_KEY, language)
    } catch (error) {
      console.warn('LandingPage: failed to persist language', error)
    }
    setSelectedLanguage(language)
    setPhase(FLOW_PHASE.WELCOME_VIDEO)
  }, [])

  const handleWelcomeVideoClose = useCallback(() => {
    setSelectedLanguage(null)
    setPhase(FLOW_PHASE.LANGUAGE)
    requestAnimationFrame(openRegistration)
  }, [openRegistration])

  const activeVideo = useMemo(() => {
    if (phase === FLOW_PHASE.JINGLE) return videos.entryJingle
    if (phase !== FLOW_PHASE.WELCOME_VIDEO) return null
    return selectedLanguage === 'en' ? videos.welcomeEn : videos.welcomeFr
  }, [phase, selectedLanguage])

  const activeVideoClose = phase === FLOW_PHASE.JINGLE ? handleJingleClose : handleWelcomeVideoClose
  const isJingle = phase === FLOW_PHASE.JINGLE
  const skipLabel = selectedLanguage === 'en' ? 'Skip video' : 'Passer la vidéo'
  const playLabel = isJingle
    ? 'Activer le son / Enable sound'
    : selectedLanguage === 'en'
      ? 'Play video with sound'
      : 'Lire la vidéo avec le son'

  return (
    <>
      <Page title="Landing Page" backgroundImg={background.homeBGWeb}>
        <View
          style={{
            flex: 1,
            justifyContent: 'center',
            alignItems: 'center',
          }}
        >
          <View style={styles.content}>
            {phase === FLOW_PHASE.LANGUAGE ? (
              <View style={styles.languageRow}>
                <TouchableOpacity
                  style={[styles.languageButton]}
                  onPress={() => handleSelectLanguage('fr')}
                >
                  <Image source={icons.frenchFlag} style={styles.flagIcon} />
                  <Text style={styles.languageText}>Français</Text>
                </TouchableOpacity>
                <TouchableOpacity
                  style={[styles.languageButton]}
                  onPress={() => handleSelectLanguage('en')}
                >
                  <Image source={icons.englishFlag} style={styles.flagIcon} />
                  <Text style={styles.languageText}>English</Text>
                </TouchableOpacity>
              </View>
            ) : null}
          </View>
        </View>
      </Page>
      {activeVideo ? (
        <FullscreenIntroVideo
          key={phase}
          url={activeVideo}
          visible
          onClose={activeVideoClose}
          contentFit="contain"
          allowSkip={!isJingle}
          requireAudio={!isJingle}
          offerSoundActivation={isJingle}
          skipLabel={skipLabel}
          playLabel={playLabel}
        />
      ) : null}
    </>
  )
}

const styles = StyleSheet.create({
  content: {
    width: '100%',
    maxWidth: 360,
    alignItems: 'center',
    gap: 32,
  },
  languageRow: {
    flexDirection: 'row',
    gap: 16,
    justifyContent: 'center',
  },
  languageButton: {
    borderRadius: 14,
    borderWidth: 1,
    borderColor: Palette.ultraLightWhite,
    backgroundColor: Palette.ultraLightWhite,
    paddingVertical: 12,
    paddingHorizontal: 18,
    minWidth: 140,
    alignItems: 'center',
    flexDirection: 'row',
    gap: 8,
  },
  flagIcon: {
    width: 24,
    height: 18,
  },
  languageText: {
    fontSize: 16,
    color: Palette.white,
    fontFamily: FONT_FAMILY.InterSemiBold,
  },
})