import { Images } from '@/constants/images';
import ServiceWallet from '@/services/wallet';
import { Ionicons } from '@expo/vector-icons';
import { Stack, useRouter } from 'expo-router';
import React, { useEffect, useState } from 'react';
import {
    Dimensions,
    ImageBackground,
    ScrollView,
    StatusBar,
    StyleSheet,
    Text,
    TouchableOpacity,
    View,
} from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';

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

interface CouponItem {
    id: string;
    name: string;
    amount: number;
    fullAmount: number; // For "Man X Keyong"
    status: number; // 1: Valid
    endTime: string;
    scene?: string; // LUCK, MALL, TRADE
}

export default function CouponScreen() {
    const router = useRouter();
    const insets = useSafeAreaInsets();
    const [list, setList] = useState<CouponItem[]>([]);
    const [loading, setLoading] = useState(false);

    useEffect(() => {
        loadData();
    }, []);

    const loadData = async () => {
        try {
            setLoading(true);
            const res = await ServiceWallet.coupons();
            // Ensure res is array or fetch from res.records if paginated
            const data = Array.isArray(res) ? res : (res?.records || []);
            setList(data);
        } catch (e) {
            console.error(e);
        } finally {
            setLoading(false);
        }
    };

    const handleUse = (item: CouponItem) => {
        // Original behavior: goAward() -> /pages/award/index (Box Screen)
        // We replicate this 1:1, or maintain specific routing if mall requires it.
        // Given request for 1:1, we prioritize Box screen.
        if (item.scene === 'MALL') {
             router.push('/(tabs)/store' as any);
        } else {
             router.push('/(tabs)/box' as any);
        }
    };

    const formatTime = (time: string) => {
        return time ? time.slice(0, 10) : '';
    };

    return (
        <View style={styles.container}>
            <Stack.Screen options={{ headerShown: false }} />
            <StatusBar barStyle="light-content" />
            <View style={[styles.header, { paddingTop: insets.top }]}>
                <TouchableOpacity style={styles.backBtn} onPress={() => router.back()}>
                    <Ionicons name="chevron-back" size={24} color="#fff" />
                </TouchableOpacity>
                <Text style={styles.title}>优惠券</Text>
            </View>

            <ImageBackground
                source={{ uri: Images.common.commonBg }}
                style={styles.background}
                resizeMode="cover"
            >
                <ScrollView
                    style={styles.scrollView}
                    contentContainerStyle={{ paddingTop: insets.top + 50, paddingBottom: 50, paddingHorizontal: 10 }}
                >
                    {list.length > 0 ? (
                            list.map((item, index) => (
                                <TouchableOpacity 
                                    key={index}
                                    activeOpacity={0.8}
                                    onPress={() => handleUse(item)}
                                >
                                    <ImageBackground
                                        source={{ uri: Images.mine.couponBg }}
                                        style={[styles.couponItem, item.status !== 1 && styles.grayscale]}
                                        resizeMode="stretch"
                                    >
                                        <View style={styles.left}>
                                            <View style={styles.amountBox}>
                                                <Text style={styles.symbol}>¥</Text>
                                                <Text style={styles.amount}>{item.amount}</Text>
                                            </View>
                                            <Text style={styles.fullAmount}>满{item.fullAmount}可用</Text>
                                        </View>
 
                                        <View style={styles.divider} />
 
                                        <View style={styles.right}>
                                            <View style={styles.info}>
                                                <Text style={styles.name}>{item.name}</Text>
                                                <Text style={styles.time}>{formatTime(item.endTime)}过期</Text>
                                            </View>
                                            <View>
                                                <ImageBackground
                                                    source={{ uri: Images.mine.couponItemButBg }}
                                                    style={styles.useBtn}
                                                    resizeMode="contain"
                                                >
                                                    <Text style={styles.useText}>立即使用</Text>
                                                </ImageBackground>
                                            </View>
                                        </View>
                                    </ImageBackground>
                                </TouchableOpacity>
                            ))
                    ) : (
                        <View style={styles.emptyBox}>
                            <Text style={styles.emptyText}>暂无优惠券</Text>
                        </View>
                    )}
                </ScrollView>
            </ImageBackground>
        </View>
    );
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#1a1a2e',
    },
    header: {
        position: 'absolute',
        top: 0,
        left: 0,
        right: 0,
        zIndex: 100,
        alignItems: 'center',
        paddingBottom: 10,
    },
    backBtn: {
        position: 'absolute',
        left: 10,
        bottom: 10,
        zIndex: 101,
    },
    title: {
        color: '#fff',
        fontSize: 16,
        fontWeight: 'bold',
    },
    background: {
        flex: 1,
        width: '100%',
        height: '100%',
    },
    scrollView: {
        flex: 1,
    },
    couponItem: {
        width: '100%',
        height: 92, // 184rpx / 2 = 92
        flexDirection: 'row',
        alignItems: 'center',
        marginBottom: 10,
        paddingHorizontal: 15, // Adjust padding based on image visual
    },
    grayscale: {
        opacity: 0.6,
        // React Native doesn't support grayscale prop directly on ImageBackground without filter or tintColor tricks
        // but opactity is a good enough approximation for invalid state
    },
    left: {
        width: 80,
        alignItems: 'center',
        justifyContent: 'center',
    },
    amountBox: {
        flexDirection: 'row',
        alignItems: 'baseline',
    },
    symbol: {
        fontSize: 12,
        color: '#404040',
    },
    amount: {
        fontSize: 30,
        fontWeight: 'bold',
        color: '#404040',
    },
    fullAmount: {
        fontSize: 12,
        color: '#8F8F8F',
        marginTop: 2,
    },
    divider: {
        width: 1,
        height: 24,
        backgroundColor: '#C3B3DF',
        marginHorizontal: 16,
        // opacity: 0, // Removed to match original design
    },
    right: {
        flex: 1,
        flexDirection: 'row',
        justifyContent: 'space-between',
        alignItems: 'center',
        paddingLeft: 10,
    },
    info: {
        justifyContent: 'center',
    },
    name: {
        fontSize: 15,
        fontWeight: 'bold',
        color: '#404040',
        marginBottom: 5,
    },
    time: {
        fontSize: 12,
        color: '#8F8F8F',
    },
    useBtn: {
        width: 87, // 174rpx / 2
        height: 37, // 74rpx / 2
        justifyContent: 'center',
        alignItems: 'center',
    },
    useText: {
        color: '#fff',
        fontSize: 12,
    },
    emptyBox: {
        marginTop: 100,
        alignItems: 'center',
    },
    emptyText: {
        color: '#999',
        fontSize: 14,
    },
});