//the size of the TabView will follow its parent-container's size.

import * as React from 'react';
import * as Location from 'expo-location';
import {
    View,
    Text,
    useWindowDimensions,
    Dimensions,
    StyleSheet,
    Image,
    ImageSourcePropType,
    ActivityIndicator,
    Pressable
} from 'react-native';
import { TabView, SceneMap, TabBar } from 'react-native-tab-view';
import { FlashList } from '@shopify/flash-list';
import { useEffect, useState } from 'react';
import { calculateDistance } from './distanceCalculator';
import { router } from 'expo-router';

export interface TabItem {
    imgURL: ImageSourcePropType;
    date: string;
    time: string;
    chargeStationName: string;
    chargeStationAddress: string;
    stationLat: string | number;
    stationLng: string | number;
    distance: string;
    format_order_id: string;
    actual_total_power?: number;
    actual_end_time?: string;
    actual_fee?: number;
    current_price?: number;
}

interface TabViewComponentProps {
    titles: string[];
    tabItems: TabItem[];
    completedReservationTabItems: TabItem[];
    isLoading?: boolean;
}

const TabViewComponent: React.FC<TabViewComponentProps> = ({
    titles,
    isLoading,
    tabItems,
    completedReservationTabItems
}) => {
    const layout = useWindowDimensions();
    const [currentLocation, setCurrentLocation] = useState<Location.LocationObject | null>(null);

    useEffect(() => {
        const getCurrentLocation = async () => {
            let { status } = await Location.requestForegroundPermissionsAsync();
            if (status !== 'granted') {
                console.error('Permission to access location was denied');
                return;
            }
            let location = await Location.getLastKnownPositionAsync({});
            setCurrentLocation(location);
        };

        getCurrentLocation();
    }, []);

    // 修复 FirstRoute 组件
    const FirstRoute = ({ tabItems, isLoading, currentLocation }: { 
            tabItems: TabItem[]; 
            isLoading?: boolean; 
            currentLocation: Location.LocationObject | null 
        }) => (
        <View style={{ flex: 1, backgroundColor: 'white' }}>
            {isLoading ? (
            <View className="items-center justify-center flex-1">
                <ActivityIndicator color="#34657b" />
            </View>
            ) : (
            <FlashList
                nestedScrollEnabled={true}
                data={tabItems.filter((item) => item?.actual_total_power && item?.actual_total_power !== 0)}
                renderItem={({ item }) => <TabItem item={item} currentLocation={currentLocation} />}
                keyExtractor={(item, index) => index.toString()}
            />
            )}
        </View>
    );

    // 修复 SecondRoute 组件
    const SecondRoute = ({ completedReservationTabItems, currentLocation }: { 
        completedReservationTabItems: TabItem[]; 
        currentLocation: Location.LocationObject | null 
    }) => (
        <View style={{ flex: 1, backgroundColor: 'white' }}>
            <FlashList
                nestedScrollEnabled={true}
                data={completedReservationTabItems.filter(
                    (item) => item.actual_total_power && item.actual_total_power > 1
                )}
                renderItem={({ item }) => <TabItem item={item} currentLocation={currentLocation} />}
                keyExtractor={(item, index) => index.toString()}
            />
        </View>
    );


   // 更新 renderScene
    const renderScene = SceneMap({
        firstRoute: () => <FirstRoute tabItems={tabItems} isLoading={isLoading} currentLocation={currentLocation} />,
        secondRoute: () => <SecondRoute completedReservationTabItems={completedReservationTabItems} currentLocation={currentLocation} />
    });

    const routes = [
        { key: 'firstRoute', title: titles[0] },
        { key: 'secondRoute', title: titles[1] }
    ];

    const [index, setIndex] = React.useState(0);
    const renderTabBar = (props: any) => (
        <TabBar
            {...props}     
            activeColor ='#025c72'
            inactiveColor='#888888'
            indicatorStyle={{
                backgroundColor: '#025c72',
            }}
            style={{
                backgroundColor: 'white',
                borderColor: '#DBE4E8',
                elevation: 0,
                marginHorizontal: 15,
                borderBottomWidth: 0.5
            }}
            labelStyle={{
                fontSize: 20,          // 文字大小
                fontWeight: 700,     // 字重
            }}
        />
    );

    return (
        <TabView
            navigationState={{ index, routes }}
            renderTabBar={renderTabBar}
            renderScene={renderScene}
            onIndexChange={setIndex}
            initialLayout={{ width: layout.width }}
            commonOptions={{
                labelStyle: {
                    fontSize: 20,          // 文字大小
                    fontWeight: 700,     // 字重
                }
            }}
            lazy
        />
    );
};

const TabItem = ({ item, currentLocation }: { item: TabItem; currentLocation: Location.LocationObject | null }) => {
    const [distance, setDistance] = useState<number | null>(null);

    useEffect(() => {
        const getDistance = async () => {
            if (currentLocation) {
                const result = await calculateDistance(
                    Number(item.stationLat),
                    Number(item.stationLng),
                    currentLocation
                );
                setDistance(result);
            }
        };

        getDistance();
    }, [currentLocation, item.stationLat, item.stationLng]);

    const formatDistance = (distanceInMeters: number): string => {
        if (distanceInMeters < 1000) {
            return `${Math.round(distanceInMeters)}米`;
        } else {
            const distanceInKm = distanceInMeters / 1000;
            return `${distanceInKm.toFixed(1)}公里`;
        }
    };

    return (
        <Pressable
            onPress={() => {
                console.log(item.format_order_id);
            }}
        >
            <View style={styles.container}>
                <Image style={styles.image} source={item.imgURL} />
                <View className="flex flex-col gap-2 mr-2">
                    <Text
                        style={{
                            fontWeight: '700',
                            color: '#02677D',
                            fontSize: 16
                        }}
                    >
                        {`${item.date}日 - ${item.time}至${item.actual_end_time}`}
                    </Text>
                    <View className="flex flex-row justify-between space-x-2">
                        <Text
                            style={{
                                fontWeight: '400',
                                fontSize: 14,
                                color: '#222222'
                            }}
                        >
                            已充電度數:{' '}
                            {item.actual_total_power
                                ? item.actual_total_power % 1 === 0
                                    ? item.actual_total_power
                                    : item.actual_total_power.toFixed(1)
                                : ''}
                        </Text>
                        <Text
                            style={{
                                fontWeight: '400',
                                fontSize: 14,
                                color: '#222222'
                            }}
                        >
                            應付金額:{' '}
                            {item.actual_fee !== undefined && item.actual_fee !== null
                                ? item.actual_fee <= 0
                                    ? '$0'
                                    : item.actual_fee % 1 === 0
                                      ? `$${item.actual_fee}`
                                      : `$${item.actual_fee.toFixed(1)}`
                                : ''}
                        </Text>
                    </View>
                    <View className="flex flex-row  space-x-2">
                        <Text
                            style={{
                                fontWeight: '400',
                                fontSize: 14,
                                color: '#222222'
                            }}
                        >
                            每度電金額: ${item.current_price}
                        </Text>
                    </View>
                    <Text
                        style={{
                            fontWeight: '400',
                            fontSize: 14,
                            color: '#888888'
                        }}
                    >
                        {item.chargeStationName}
                    </Text>
                </View>
            </View>
        </Pressable>
    );
};

export default TabViewComponent;

const styles = StyleSheet.create({
    container: {
        flexDirection: 'row',
        width: '100%',
        flex: 1,
        alignItems: 'center'
    },
    image: {
        width: 100,
        height: 100,
        margin: 15,
        borderRadius: 10
    },
    textContainer: {
        flex: 1,
        flexDirection: 'column',
        gap: 8,
        marginTop: 20,
        marginRight: 8 // Add right margin to prevent text from touching the edge
    }
});