import * as Haptics from 'expo-haptics';
import * as MediaLibrary from 'expo-media-library';
import React, { useRef } from 'react';
import { Alert, StyleSheet, TouchableOpacity, View } from 'react-native';
import QRCode from 'react-native-qrcode-svg';
import { captureRef } from 'react-native-view-shot';

export default function QRDownloadScreen(prop: { url: string }) {
    const qrViewRef = useRef<View>(null); // 用于截图的引用
    const [qrValue] = React.useState(prop.url); // 二维码内容

    const saveQRToGallery = async () => {
        try {
            // 触发轻震，提升交互感
            await Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light);

            // 请求相册写入权限
            const { status } = await MediaLibrary.requestPermissionsAsync();
            if (status !== 'granted') {
                Alert.alert('权限被拒绝', '需要保存图片到相册的权限');
                return;
            }

            if (!qrViewRef.current) return;

            // 截取二维码视图
            const uri = await captureRef(qrViewRef, {
                format: 'png',
                quality: 1,
                result: 'tmpfile', // 返回临时文件路径
            });

            // 保存到相册
            await MediaLibrary.saveToLibraryAsync(uri);

            Alert.alert('✅ 成功', '二维码已保存到相册！');
        } catch (error) {
            console.error('保存失败:', error);
            Alert.alert('❌ 失败', '无法保存图片，请重试');
        }
    };

    return (
        <View style={styles.container}>
            {/* 可截图的容器 */}
            <TouchableOpacity onLongPress={saveQRToGallery} activeOpacity={0.8}>
                <View ref={qrViewRef} style={styles.qrContainer}>
                    <QRCode value={qrValue} size={200} />
                </View>
            </TouchableOpacity>
        </View>
    );
}

const styles = StyleSheet.create({
    container: {
        // flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
    },
    qrContainer: {
        padding: 16,
        backgroundColor: '#fff',
        borderRadius: 12,
    },
    tip: {
        marginTop: 20,
        color: '#666',
        fontSize: 14,
    },
});