import {
    View,
    Text,
    StyleSheet,
    FlatList,
    Dimensions,
    Pressable,
    StatusBar as RNStatusBar,
    Alert,
} from 'react-native'
import { StatusBar } from 'expo-status-bar'
import { SafeAreaView } from 'react-native-safe-area-context'
import { Image } from 'expo-image'
import { useRouter } from 'expo-router'
import { useEffect, useState } from 'react'
import { useTranslation } from 'react-i18next'

import { LeftArrowIcon, DeleteIcon, EditIcon, ChangeIcon, WhiteStarIcon } from '@/components/icon'
import { DeleteConfirmDialog } from '@/components/ui/delete-confirm-dialog'
import LoadingState from '@/components/LoadingState'
import ErrorState from '@/components/ErrorState'
import PaginationLoader from '@/components/PaginationLoader'
import {
    useTemplateGenerations,
    useDeleteGeneration,
    type TemplateGeneration,
} from '@/hooks'

const { width: screenWidth } = Dimensions.get('window')

export default function GenerationRecordScreen() {
    const { t } = useTranslation()
    const router = useRouter()
    const [deleteDialogOpen, setDeleteDialogOpen] = useState(false)
    const [selectedId, setSelectedId] = useState<string | null>(null)

    const { generations, loading, loadingMore, error, execute, refetch, loadMore, hasMore } = useTemplateGenerations()
    const { deleteGeneration, loading: deleting } = useDeleteGeneration()

    useEffect(() => {
        execute({ page: 1, limit: 20 })
    }, [execute])

    const handleDelete = async () => {
        if (!selectedId) return

        const { data, error } = await deleteGeneration(selectedId)

        if (error) {
            Alert.alert(t('common.error'), error.message || t('generationRecord.deleteError'))
        } else {
            Alert.alert(t('common.success'), data?.message || t('generationRecord.deleteSuccess'))
            // 刷新列表
            refetch({ page: 1, limit: 20 })
        }

        setDeleteDialogOpen(false)
        setSelectedId(null)
    }

    const handleRefresh = () => {
        refetch({ page: 1, limit: 20 })
    }

    const handleLoadMore = () => {
        if (hasMore && !loadingMore) {
            loadMore({ limit: 20 })
        }
    }


    const renderItem = ({ item }: { item: TemplateGeneration }) => (
        <View style={styles.itemContainer}>
            <View style={styles.categorySection}>
                <View style={styles.categoryIcon}>
                    <WhiteStarIcon />
                </View>
                <Text style={styles.categoryText}>{item.template?.title || t('generationRecord.aiVideo')}</Text>
            </View>

            <View style={styles.originalImageSection}>
                <Text style={styles.originalImageLabel}>{t('generationRecord.originalImage')}</Text>
                <View style={styles.originalImageDivider} />
            </View>

            <View style={styles.imageContainer}>
                <Image
                    source={{ uri: item.resultUrl?.[0] || item.originalUrl }}
                    style={styles.mainImage}
                    contentFit="cover"
                />
            </View>
            <Text style={styles.durationText}>00:03</Text>

            <View style={styles.actionButtons}>
                <Pressable style={styles.actionButton} onPress={() => {
                    router.push({
                        pathname: '/generateVideo' as any,
                        params: { template: JSON.stringify(item.template) },
                    })
                }}>
                    <EditIcon />
                    <Text style={styles.actionButtonText}>{t('generationRecord.reEdit')}</Text>
                </Pressable>
                <Pressable style={styles.actionButton}>
                    <ChangeIcon />
                    <Text style={styles.actionButtonText}>{t('generationRecord.regenerate')}</Text>
                </Pressable>
                <Pressable
                    style={[styles.deleteButton, deleting && selectedId === item.id && styles.deleteButtonDisabled]}
                    onPress={() => {
                        if (!deleting) {
                            setSelectedId(item.id)
                            setDeleteDialogOpen(true)
                        }
                    }}
                    disabled={deleting && selectedId === item.id}
                >
                    <DeleteIcon />
                </Pressable>
            </View>
        </View>
    )

    if (loading && generations.length === 0) {
        return (
            <SafeAreaView style={styles.container} edges={['top']}>
                <StatusBar style="light" />
                <RNStatusBar barStyle="light-content" />
                <View style={styles.header}>
                    <Pressable style={styles.backButton} onPress={() => router.back()}>
                        <LeftArrowIcon />
                    </Pressable>
                    <Text style={styles.headerTitle}>{t('generationRecord.title')}</Text>
                    <View style={styles.headerSpacer} />
                </View>
                <LoadingState testID="loading-state" />
            </SafeAreaView>
        )
    }

    if (error && generations.length === 0) {
        return (
            <SafeAreaView style={styles.container} edges={['top']}>
                <StatusBar style="light" />
                <RNStatusBar barStyle="light-content" />
                <View style={styles.header}>
                    <Pressable style={styles.backButton} onPress={() => router.back()}>
                        <LeftArrowIcon />
                    </Pressable>
                    <Text style={styles.headerTitle}>{t('generationRecord.title')}</Text>
                    <View style={styles.headerSpacer} />
                </View>
                <ErrorState testID="error-state" message={error.message} onRetry={handleRefresh} />
            </SafeAreaView>
        )
    }


    return (
        <SafeAreaView style={styles.container} edges={['top']}>
            <StatusBar style="light" />
            <RNStatusBar barStyle="light-content" />
            <View style={styles.header}>
                <Pressable style={styles.backButton} onPress={() => router.back()}>
                    <LeftArrowIcon />
                </Pressable>
                <Text style={styles.headerTitle}>{t('generationRecord.title')}</Text>
                <View style={styles.headerSpacer} />
            </View>

            <FlatList
                testID="generation-list"
                data={generations}
                renderItem={renderItem}
                keyExtractor={(item) => item.id}
                contentContainerStyle={styles.scrollContent}
                showsVerticalScrollIndicator={false}
                onEndReached={handleLoadMore}
                onEndReachedThreshold={0.5}
                ListFooterComponent={loadingMore ? <PaginationLoader testID="pagination-loader" /> : null}
            />

            <DeleteConfirmDialog
                open={deleteDialogOpen}
                onOpenChange={setDeleteDialogOpen}
                onConfirm={handleDelete}
            />
        </SafeAreaView>
    )
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#090A0B',
    },
    scrollContent: {
        paddingBottom: 20,
    },
    header: {
        flexDirection: 'row',
        alignItems: 'center',
        paddingHorizontal: 12,
        paddingTop: 16,
        paddingBottom: 20,
    },
    backButton: {
        width: 22,
        height: 22,
        alignItems: 'center',
        justifyContent: 'center',
    },
    headerTitle: {
        color: '#F5F5F5',
        fontSize: 14,
        fontWeight: '600',
        flex: 1,
        textAlign: 'center',
    },
    headerSpacer: {
        width: 22,
    },
    itemContainer: {
        marginBottom: 24,
    },
    categorySection: {
        flexDirection: 'row',
        alignItems: 'center',
        paddingHorizontal: 16,
        marginBottom: 8,
        gap: 4,
    },
    categoryIcon: {
        width: 16,
        height: 16,
        alignItems: 'center',
        justifyContent: 'center',
    },
    categoryText: {
        color: '#F5F5F5',
        fontSize: 14,
        fontWeight: '600',
    },
    originalImageSection: {
        flexDirection: 'row',
        alignItems: 'center',
        paddingHorizontal: 16,
        marginBottom: 8,
    },
    originalImageLabel: {
        color: '#8A8A8A',
        fontSize: 13,
        marginRight: 6,
    },
    originalImageDivider: {
        width: 1,
        height: 12,
        backgroundColor: '#FFFFFF33',
    },
    imageContainer: {
        width: screenWidth - 24,
        height: (screenWidth - 24) * 1.32,
        marginHorizontal: 12,
        marginBottom: 14,
        borderRadius: 16,
        overflow: 'hidden',
        backgroundColor: '#1C1E22',
    },
    mainImage: {
        width: '100%',
        height: '100%',
    },
    durationText: {
        paddingLeft: 28,
        color: '#F5F5F5',
        fontSize: 13,
        marginBottom: 22,
        fontWeight: '500',
    },
    actionButtons: {
        flexDirection: 'row',
        alignItems: 'center',
        paddingHorizontal: 12,
        gap: 8,
    },
    actionButton: {
        flexDirection: 'row',
        alignItems: 'center',
        justifyContent: 'center',
        paddingHorizontal: 8,
        paddingVertical: 6,
        borderRadius: 8,
        backgroundColor: '#1C1E22',
        height: 32,
    },
    actionButtonText: {
        color: '#F5F5F5',
        fontSize: 11,
        fontWeight: '500',
    },
    deleteButton: {
        width: 32,
        height: 32,
        borderRadius: 8,
        backgroundColor: '#1C1E22',
        alignItems: 'center',
        justifyContent: 'center',
        marginLeft: 'auto',
    },
    deleteButtonDisabled: {
        opacity: 0.5,
    },
})

