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

import * as React from 'react';
import {
    View,
    Text,
    useWindowDimensions,
    StyleSheet,
    ImageSourcePropType,
    ScrollView,
    ActivityIndicator,
    Pressable,
    Alert
} from 'react-native';
import { TabView, SceneMap, TabBar } from 'react-native-tab-view';

import { IndividualCouponComponent } from '../accountPages/walletPageComponent';
import { formatCouponDate } from '../../util/lib';
import { useCallback, useEffect, useRef, useState } from 'react';
import { walletService } from '../../service/walletService';
import { useChargingStore } from '../../providers/scan_qr_payload_store';
import { chargeStationService } from '../../service/chargeStationService';
import { router } from 'expo-router';
import axios from 'axios';

export interface TabItem {
    imgURL: ImageSourcePropType;
    date: string;
    time: string;
    chargeStationName: string;
    chargeStationAddress: string;
    distance: string;
}

interface TabViewComponentProps {
    titles: string[];
}

const FirstRoute = ({
    coupons,
    loading,
    handleCouponClick
}: {
    coupons: any;
    loading: boolean;
    handleCouponClick: any;
}) => {
    return (
        <View className="flex-1">
            <ScrollView
                style={{ flex: 1, backgroundColor: 'white', marginTop: 14 }}
                contentContainerStyle={{ paddingBottom: 200 }}
            >
                <View className="flex-1 flex-col">
                    {loading ? (
                        <View className="items-center justify-center">
                            <ActivityIndicator />
                        </View>
                    ) : (
                        <View className="">
                            <View>
                                {coupons.filter(
                                    (coupon: any) =>
                                        coupon.permission == true &&
                                        coupon.is_consumed === false &&
                                        (coupon.expire_date === null || new Date(coupon.expire_date) > new Date())
                                ).length === 0 ? (
                                    <Text className="pl-4">暫時戶口沒有優惠券。</Text>
                                ) : (
                                    coupons
                                        .filter(
                                            (coupon: any) =>
                                                coupon.permission == true &&
                                                coupon.is_consumed === false &&
                                                (coupon.expire_date === null ||
                                                    new Date(coupon.expire_date) > new Date())
                                        )
                                        .sort(
                                            (a: any, b: any) =>
                                                new Date(a.expire_date).getTime() - new Date(b.expire_date).getTime()
                                        )
                                        .slice(0, 30)
                                        .map((coupon: any, index: any) => (
                                            <IndividualCouponComponent
                                                onCouponClick={handleCouponClick}
                                                // key={coupon.redeem_code}
                                                key={`${coupon.id}-${index}`}
                                                title={coupon.coupon.name}
                                                price={coupon.coupon.amount}
                                                detail={coupon.coupon.description}
                                                date={formatCouponDate(coupon.expire_date)}
                                                setOpacity={false}
                                                redeem_code={coupon.id}
                                            />
                                        ))
                                )}
                            </View>
                        </View>
                    )}
                </View>
            </ScrollView>
        </View>
    );
};

const SecondRoute = ({ coupons }: { coupons: any }) => (
    <ScrollView style={{ flex: 1, backgroundColor: 'white', marginTop: 14 }}>
        <View className="flex-1 flex-col">
            {coupons
                .filter(
                    (coupon: any) =>
                        coupon.is_consumed === true ||
                        (coupon.expire_date !== null && new Date(coupon.expire_date) < new Date())
                )
                .slice(0, 30)
                .map((coupon: any, index: any) => (
                    <IndividualCouponComponent
                        key={`${coupon.id}-${index}`}
                        title={coupon.coupon.name}
                        price={coupon.coupon.amount}
                        detail={coupon.coupon.description}
                        date={formatCouponDate(coupon.expire_date)}
                        setOpacity={true}
                        noCircle={true}
                    />
                ))}
        </View>
    </ScrollView>
);

const CouponTabViewComponent: React.FC<TabViewComponentProps> = ({ titles }) => {
    const layout = useWindowDimensions();
    const [loading, setLoading] = useState(false);
    const [coupons, setCoupons] = useState([]);
    const [userID, setUserID] = useState('');
    const {
        current_price_store,
        setCurrentPriceStore,
        stationID,
        promotion_code,
        setPromotionCode,
        setCouponDetail,
        coupon_detail,
        total_power,
        setTotalPower,
        setProcessedCouponStore,
        setSumOfCoupon
    } = useChargingStore();

    useEffect(() => {
        const fetchData = async () => {
            try {
                setLoading(true);
                const info = await walletService.getCustomerInfo();
                const coupon = await walletService.getCouponForSpecificUser(info.id);
                setUserID(info.id);
                setCoupons(coupon);
            } catch (error) {
                console.log(error);
            } finally {
                setLoading(false);
            }
        };
        fetchData();
    }, []);
    //fetch current price for coupon valid calculation
    useEffect(() => {
        const fetchCurrentPrice = async () => {
            try {
                const response = await chargeStationService.getOriginalPriceInPay(stationID);
                setCurrentPriceStore(response);
            } catch (error) {
                // More specific error handling
                if (axios.isAxiosError(error)) {
                    const errorMessage = error.response?.data?.message || 'Network error occurred';
                    Alert.alert('Error', `Unable to fetch price: ${errorMessage}`, [
                        {
                            text: 'OK',
                            onPress: () => {
                                cleanupData();
                                router.push('/mainPage');
                            }
                        }
                    ]);
                } else {
                    Alert.alert('Error', 'An unexpected error occurred while fetching the price', [
                        {
                            text: 'OK',
                            onPress: () => {
                                cleanupData();
                                router.push('/mainPage');
                            }
                        }
                    ]);
                }
            }
        };
        fetchCurrentPrice();
    }, []);

    const handleCouponClick = async (clickedCoupon: string) => {
        let temp_promotion_code = [...promotion_code];
        if (!current_price_store) {
            Alert.alert('Error', 'Unable to fetch price', [
                {
                    text: 'OK',
                    onPress: () => {
                        cleanupData();
                        router.push('/mainPage');
                    }
                }
            ]);
            return;
        }
        let orderAmount = current_price_store * total_power;

        //when i click on a coupon, if coupone doesnt already exist in the stack, i add it to the stack
        if (!promotion_code.includes(clickedCoupon)) {
            const found_coupon = coupons.find((coupon: any) => coupon.id === clickedCoupon);
            temp_promotion_code = [...promotion_code, found_coupon.id];
            try {
                const valid = await chargeStationService.validateCoupon(temp_promotion_code, orderAmount);

                if (valid === true) {
                    setCouponDetail([...coupon_detail, found_coupon]);
                    setPromotionCode([...promotion_code, clickedCoupon]);
                } else {
                    Alert.alert('不符合使用優惠券的條件', '請查看優惠卷的詳情，例如是否需要滿足最低消費金額。');
                }
            } catch (error) {
                console.log(error);
            }
        } else {
            //coupon already exists, this de-select the coupon
            const index_of_clicked_coupon = promotion_code.findIndex((i) => i === clickedCoupon);
            const newPromotionCode = [...promotion_code];
            newPromotionCode.splice(index_of_clicked_coupon, 1);
            setPromotionCode(newPromotionCode);
            const newCouponDetail = coupon_detail.filter((detail: any) => detail.id !== clickedCoupon);
            setCouponDetail(newCouponDetail);
        }
    };
    const cleanupData = () => {
        setPromotionCode([]);
        setCouponDetail([]);
        setProcessedCouponStore([]);
        setSumOfCoupon(0);
        setTotalPower(null);
    };
    const renderScene = useCallback(
        ({ route }: { route: any }) => {
            switch (route.key) {
                case 'firstRoute':
                    return <FirstRoute coupons={coupons} loading={loading} handleCouponClick={handleCouponClick} />;
                case 'secondRoute':
                    return <SecondRoute coupons={coupons} />;
                default:
                    return null;
            }
        },
        [coupons, loading, handleCouponClick]
    );

    const [routes] = React.useState([
        { key: 'firstRoute', title: titles[0] },
        { key: 'secondRoute', title: titles[1] }
    ]);
    const [index, setIndex] = React.useState(0);

    const renderTabBar = (props: any) => (
        <TabBar
            {...props}
            indicatorStyle={{
                backgroundColor: '#025c72'
            }}
            style={{
                backgroundColor: 'white',
                borderColor: '#DBE4E8',
                elevation: 0,
                marginHorizontal: 15,
                borderBottomWidth: 0.5
            }}
        />
    );
    return (
        <TabView
            navigationState={{ index, routes }}
            renderScene={renderScene}
            onIndexChange={setIndex}
            initialLayout={{ width: layout.width }}
            renderTabBar={renderTabBar}
            commonOptions={{
                label: ({ route, focused }) => (
                    <Text
                        style={{
                            color: focused ? '#025c72' : '#888888',
                            fontWeight: focused ? '900' : 'thin',
                            fontSize: 20
                        }}
                    >
                        {route.title}
                    </Text>
                )
            }}
        />
    );
};
export default CouponTabViewComponent;

const styles = StyleSheet.create({
    container: { flexDirection: 'row' },
    image: { width: 100, height: 100, margin: 15, borderRadius: 10 },
    textContainer: { flexDirection: 'column', gap: 8, marginTop: 20 },
    floatingButton: {
        elevation: 5,
        shadowColor: '#000',
        shadowOffset: { width: 0, height: 2 },
        shadowOpacity: 0.25,
        shadowRadius: 3.84
    }
});