import firebase, { tasksRef } from '../../config/firebase'
import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react'
import { ActivityIndicator, Alert, StyleSheet, Text, View } from 'react-native'
import { background } from '../../assets'
import BorderGradientButton from '../../components/BorderGradientButton'
import GradientButton from '../../components/GradientButton'
import MusiclandPlaybackCover from '../../components/MusiclandPlaybackCover'
import MusicLandHeader from '../../components/MusicLandHeader'
import { uploadFileToFirebase } from '../../helpers/uploadToFirebase'
import { isWeb } from '../../hooks/useLayoutType'
import Page from '../../layouts/Page'
import { Routes } from '../../navigation'
import { goBack, navigate } from '../../navigation/NavigationService'
import { useUser } from '../../providers/UserDataProvider'
import { gutters, Palette, Style } from '../../styles'
import { FONT_FAMILY } from '../../styles/Fonts'
import { createMusiclandPlaybackCover } from '../../utils/createMusiclandPlaybackCover'
import CreateLyricsHeader from '../Writing/components/CreateLyricsHeader'

const COVER_TEMPLATE = 'MUSICLAND_PLAYBACKER'
const COVER_OPTION_ID = 'musicland-playbacker'

const PouchReady = () => {
  const {
    selectedProjectId,
    selectedProject,
    currentUserData,
    updateProjectData,
  } = useUser()
  const requestStartedRef = useRef(false)
  const [isSaving, setIsSaving] = useState(false)

  const templateCover =
    selectedProject?.cover?.template === COVER_TEMPLATE ? selectedProject.cover : null
  const coverUrl = templateCover?.result || null
  const isPreparing = selectedProject?.coverStatus === 'GENERATING'
  const hasPreparationError = selectedProject?.coverStatus === 'ERROR'
  const artistName =
    typeof selectedProject?.userName === 'string' && selectedProject.userName.trim()
      ? selectedProject.userName.trim()
      : currentUserData?.userName || 'MusicLand'
  const profilePictureURL = currentUserData?.profilePictureURL || null
  const centerImageURL = selectedProject?.coverCenterImageURL || profilePictureURL

  const selectedOption = useMemo(() => {
    if (!coverUrl) {
      return isWeb
        ? {
            id: COVER_OPTION_ID,
            finalUrl: null,
            generatedUrl: null,
          }
        : null
    }
    const savedOption = Array.isArray(templateCover?.options) ? templateCover.options[0] : null
    return (
      savedOption || {
        id: COVER_TEMPLATE,
        finalUrl: coverUrl,
        generatedUrl: null,
      }
    )
  }, [coverUrl, templateCover?.options])

  const requestCoverPreparation = useCallback(async () => {
    if (!selectedProjectId || requestStartedRef.current || isPreparing) {
      return
    }
    requestStartedRef.current = true
    try {
      await updateProjectData(
        {
          coverStatus: 'PENDING',
          cover: {
            template: COVER_TEMPLATE,
            result: null,
            selectedOptionId: COVER_TEMPLATE,
            options: [],
          },
        },
        { merge: true }
      )
      await tasksRef.add({
        type: 'cover',
        projectId: selectedProjectId,
        status: 'PENDING',
        createdAt: firebase.firestore.FieldValue.serverTimestamp(),
      })
    } catch (error) {
      requestStartedRef.current = false
      console.log('PouchReady: unable to prepare cover', error?.message)
    }
  }, [isPreparing, selectedProjectId, updateProjectData])

  useEffect(() => {
    if (isWeb || coverUrl || isPreparing || hasPreparationError) {
      return
    }
    requestCoverPreparation()
  }, [coverUrl, hasPreparationError, isPreparing, requestCoverPreparation])

  const retryPreparation = useCallback(() => {
    requestStartedRef.current = false
    requestCoverPreparation()
  }, [requestCoverPreparation])

  const onValidatePicture = useCallback(async () => {
    if (!selectedOption) {
      return
    }
    try {
      setIsSaving(true)
      let optionToSave = selectedOption
      let projectToSave = selectedProject

      if (isWeb && !coverUrl) {
        const userId = selectedProject?.userId
        if (!userId || !selectedProjectId) {
          throw new Error('cover_project_identity_missing')
        }
        const coverBlob = await createMusiclandPlaybackCover({
          artistName,
          profilePictureURL: centerImageURL,
        })
        const storagePath = `users/${userId}/projects/${selectedProjectId}/cover-musicland-playbacker.png`
        const { resultURI } = await uploadFileToFirebase({
          path: storagePath,
          fileType: 'IMAGE',
          blob: coverBlob,
        })
        optionToSave = {
          id: COVER_OPTION_ID,
          finalUrl: resultURI,
          generatedUrl: null,
        }
        const cover = {
          template: COVER_TEMPLATE,
          result: resultURI,
          generatedBackground: null,
          selectedOptionId: COVER_OPTION_ID,
          options: [optionToSave],
        }
        await updateProjectData(
          {
            cover,
            coverStatus: 'GENERATED',
          },
          { merge: true }
        )
        projectToSave = {
          ...selectedProject,
          cover,
          coverStatus: 'GENERATED',
        }
      }

      navigate(Routes.SongDownload, {
        project: projectToSave,
        selectedOption: optionToSave,
        coverOptions: [optionToSave],
        backRoute: Routes.PouchReady,
      })
    } catch (error) {
      console.log('PouchReady: unable to save cover', error?.message)
      Alert.alert(
        'Enregistrement impossible',
        'La pochette n’a pas pu être enregistrée. Réessaie dans quelques instants.'
      )
    } finally {
      setIsSaving(false)
    }
  }, [
    artistName,
    coverUrl,
    centerImageURL,
    selectedOption,
    selectedProject,
    selectedProjectId,
    updateProjectData,
  ])

  return (
    <Page backgroundImg={background.studioBG2} headerType="NONE">
      <MusicLandHeader onPressBack={goBack} progress={90} />
      <View style={styles.pageContent}>
        <CreateLyricsHeader
          title="Ta pochette MusicLand"
          subTitle={
            selectedProject?.coverCenterImageURL
              ? "L’image choisie et ton nom d’artiste apparaissent automatiquement."
              : "Ta photo de profil et ton nom d’artiste apparaissent automatiquement."
          }
        />
        <View style={[styles.previewArea, Style.containerCenter]}>
          <MusiclandPlaybackCover
            artistName={artistName}
            profilePictureURL={centerImageURL}
            coverUrl={coverUrl}
            style={isWeb ? styles.coverWeb : styles.coverMobile}
          />
          {!isWeb && !coverUrl && !hasPreparationError ? (
            <View style={styles.preparingRow}>
              <ActivityIndicator color={Palette.white} />
              <Text style={styles.preparingText}>Préparation de ta pochette…</Text>
            </View>
          ) : null}
          {hasPreparationError ? (
            <View style={styles.errorPanel}>
              <Text style={styles.errorText}>
                La pochette n’a pas pu être préparée. Tu peux réessayer.
              </Text>
              <BorderGradientButton title="Réessayer" onPress={retryPreparation} />
            </View>
          ) : null}
        </View>
      </View>
      <View style={styles.footer}>
        <GradientButton
          title={isSaving ? 'Enregistrement…' : 'Valider la pochette'}
          onPress={onValidatePicture}
          disabled={isSaving || (!isWeb && (!selectedOption || isPreparing))}
        />
      </View>
    </Page>
  )
}

const styles = StyleSheet.create({
  pageContent: {
    flex: 1,
    marginTop: 8,
  },
  previewArea: {
    flex: 1,
    width: '100%',
    paddingHorizontal: gutters,
    gap: 16,
  },
  coverWeb: {
    width: 360,
    maxWidth: '70%',
  },
  coverMobile: {
    width: '86%',
    maxWidth: 380,
  },
  preparingRow: {
    minHeight: 24,
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    gap: 10,
  },
  preparingText: {
    color: Palette.white,
    fontFamily: FONT_FAMILY.InterRegular,
    fontSize: 14,
  },
  errorPanel: {
    width: isWeb ? 360 : '86%',
    maxWidth: 380,
    gap: 12,
  },
  errorText: {
    color: Palette.white,
    fontFamily: FONT_FAMILY.InterRegular,
    fontSize: 14,
    lineHeight: 20,
    textAlign: 'center',
  },
  footer: {
    width: '80%',
    maxWidth: 520,
    alignSelf: 'center',
    paddingBottom: gutters * 2,
  },
})

export default PouchReady