import { useState, useRef, useEffect } from 'react'
import {
    View,
    Text,
    StyleSheet,
    ScrollView,
    StatusBar as RNStatusBar,
    TextInput,
    Pressable,
} from 'react-native'
import { StatusBar } from 'expo-status-bar'
import { SafeAreaView } from 'react-native-safe-area-context'
import { useRouter, useLocalSearchParams } from 'expo-router'
import { useTranslation } from 'react-i18next'

import SearchBar from '@/components/SearchBar'
import { DeleteIcon, Close1Icon } from '@/components/icon'

export default function SearchWorksScreen() {
    const { t } = useTranslation()
    const router = useRouter()
    const params = useLocalSearchParams()
    const [searchText, setSearchText] = useState('')
    const [isDeleteMode, setIsDeleteMode] = useState(false)
    const [searchHistory, setSearchHistory] = useState<string[]>(['写真', '萌宠', '合拍', '风景'])
    const inputRef = useRef<TextInput>(null)
    const isNavigatingRef = useRef(false)

    // 当从搜索结果页面返回时，更新搜索文本
    useEffect(() => {
        if (params.q && typeof params.q === 'string') {
            setSearchText(params.q)
        }
    }, [params.q])

    const handleSearch = (text: string) => {
        const trimmedText = text.trim()
        if (trimmedText) {
            // 添加到搜索历史（去重，新搜索词放在最前面）
            setSearchHistory((prev) => {
                const filtered = prev.filter((item) => item !== trimmedText)
                return [trimmedText, ...filtered].slice(0, 10) // 最多保留10条
            })
            
            // 跳转到搜索结果页面
            router.push({
                pathname: '/searchWorksResults',
                params: { q: trimmedText },
            })
        }
    }

    const handleHistoryTagPress = (item: string) => {
        if (!isDeleteMode && !isNavigatingRef.current) {
            isNavigatingRef.current = true
            requestAnimationFrame(() => {
                router.push({
                    pathname: '/searchWorksResults',
                    params: { q: item },
                })
                // 延迟重置，防止快速重复点击
                setTimeout(() => {
                    isNavigatingRef.current = false
                }, 500)
            })
        }
    }

    return (
        <SafeAreaView style={styles.container} edges={['top']}>
            <StatusBar style="light" />
            <RNStatusBar barStyle="light-content" />

            {/* Top Bar with Search */}
            <SearchBar
                searchText={searchText}
                onSearchTextChange={setSearchText}
                onSearch={handleSearch}
                onBack={() => router.push('/worksList')}
                placeholder={t('search.searchWorks')}
                inputRef={inputRef}
                autoFocus={true}
            />

            {/* 内容区域 */}
            <ScrollView
                style={styles.scrollView}
                contentContainerStyle={styles.scrollContent}
                showsVerticalScrollIndicator={false}
            >
                {/* 搜索历史 */}
                {searchHistory.length > 0 && (
                    <View style={styles.historySection}>
                        <View style={styles.historyHeader}>
                            <Text style={styles.sectionTitle}>{t('search.history')}</Text>
                            {isDeleteMode ? (
                                <View style={styles.deleteActions}>
                                    <Pressable
                                        onPress={() => {
                                            setSearchHistory([])
                                            setIsDeleteMode(false)
                                        }}
                                    >
                                        <Text style={styles.deleteActionText}>{t('search.clearAll')}</Text>
                                    </Pressable>
                                    <View style={styles.deleteActionSeparator} />
                                    <Pressable
                                        onPress={() => setIsDeleteMode(false)}
                                    >
                                        <Text style={styles.deleteActionText}>{t('search.done')}</Text>
                                    </Pressable>
                                </View>
                            ) : (
                                <Pressable
                                    onPress={() => setIsDeleteMode(true)}
                                >
                                    <DeleteIcon />
                                </Pressable>
                            )}
                        </View>
                        <View style={styles.historyTags}>
                            {searchHistory.map((item, index) => (
                                <View
                                    key={index}
                                    style={styles.historyTagContainer}
                                >
                                    <Pressable
                                        style={styles.historyTag}
                                        onPress={() => handleHistoryTagPress(item)}
                                    >
                                        <Text style={styles.historyTagText}>{item}</Text>
                                        {isDeleteMode && (
                                        <Pressable
                                            style={styles.historyTagDeleteButton}
                                            onPress={() => {
                                                setSearchHistory(searchHistory.filter((_, i) => i !== index))
                                            }}
                                        >
                                            <Close1Icon />
                                        </Pressable>
                                    )}
                                    </Pressable>
                                  
                                </View>
                            ))}
                        </View>
                    </View>
                )}
                
                {searchHistory.length === 0 && (
                    <View style={styles.emptyContainer}>
                        <Text style={styles.emptyText}>{t('search.searchWorksPlaceholder')}</Text>
                    </View>
                )}
            </ScrollView>
        </SafeAreaView>
    )
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#090A0B',
    },
    scrollView: {
        flex: 1,
        backgroundColor: '#090A0B',
        paddingHorizontal: 12,
    },
    scrollContent: {
        paddingBottom: 20,
    },
    historySection: {
        paddingBottom: 32,
    },
    historyHeader: {
        flexDirection: 'row',
        justifyContent: 'space-between',
        alignItems: 'center',
    },
    sectionTitle: {
        color: '#F5F5F5',
        fontSize: 14,
        fontWeight: '500',
        lineHeight: 20,
    },
    historyTags: {
        flexDirection: 'row',
        flexWrap: 'wrap',
        gap: 4,
        marginTop: 16,
    },
    historyTagContainer: {
        flexDirection: 'row',
        alignItems: 'center',
        gap: 4,
    },
    historyTag: {
        backgroundColor: '#191B1F',
        borderRadius: 100,
        paddingHorizontal: 11,
        paddingVertical: 6,
        borderWidth: 1,
        borderColor: '#191B1F',
        height: 29,
        justifyContent: 'center',
        flexDirection: 'row',
        alignItems: 'center',
        gap: 4,
    },
    historyTagText: {
        color: '#F5F5F5',
        fontSize: 12,
    },
    historyTagDeleteButton: {
        justifyContent: 'center',
        alignItems: 'center',
    },
    deleteActions: {
        flexDirection: 'row',
        alignItems: 'center',
    },
    deleteActionText: {
        color: '#ABABAB',
        fontSize: 14,
        fontWeight: '400',
    },
    deleteActionSeparator: {
        width: 1,
        height: 14,
        backgroundColor: '#ABABAB',
        marginHorizontal: 12,
    },
    emptyContainer: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        paddingTop: 100,
    },
    emptyText: {
        color: '#8A8A8A',
        fontSize: 14,
    },
})