import React, {useEffect, useRef, useState} from "react";
import {StyleSheet, TouchableOpacity} from "react-native";
import {ScrollView} from "react-native-gesture-handler";
import * as ImagePicker from "expo-image-picker";
import {Colors, Image, Picker, Text, TextField, View} from "react-native-ui-lib";
import Ionicons from "@expo/vector-icons/Ionicons";
import * as tz from "tzdata";
import * as Localization from "expo-localization";
import debounce from "debounce";
import {useAuthContext} from "@/contexts/AuthContext";
import {useUpdateUserData} from "@/hooks/firebase/useUpdateUserData";
import {useChangeProfilePicture} from "@/hooks/firebase/useChangeProfilePicture";

const MyProfile = () => {
    const {user, profileData} = useAuthContext();
    const [timeZone, setTimeZone] = useState<string>(
        profileData?.timeZone! ?? Localization.getCalendars()[0].timeZone
    );
    const [lastName, setLastName] = useState<string>(profileData?.lastName || "");
    const [firstName, setFirstName] = useState<string>(
        profileData?.firstName || ""
    );
    const [profileImage, setProfileImage] = useState<string | ImagePicker.ImagePickerAsset | null>(profileData?.pfp || null);

    const {mutateAsync: updateUserData} = useUpdateUserData();
    const {mutateAsync: changeProfilePicture} = useChangeProfilePicture();
    const isFirstRender = useRef(true);

    const handleUpdateUserData = async () => {
        await updateUserData({newUserData: {firstName, lastName, timeZone}});
    };

    const debouncedUserDataUpdate = debounce(handleUpdateUserData, 500);

    useEffect(() => {
        if (isFirstRender.current) {
            isFirstRender.current = false;
            return;
        }
        debouncedUserDataUpdate();
    }, [timeZone, lastName, firstName, profileImage]);

    useEffect(() => {
        if (profileData) {
            setFirstName(profileData.firstName || "");
            setLastName(profileData.lastName || "");
            // setProfileImage(profileData.pfp || null);
            setTimeZone(profileData.timeZone || Localization.getCalendars()[0].timeZone!);
        }
    }, [profileData]);

    const pickImage = async () => {
        const permissionResult = await ImagePicker.requestMediaLibraryPermissionsAsync();
        if (!permissionResult.granted) {
            alert("Permission to access camera roll is required!");
            return;
        }

        const result = await ImagePicker.launchImageLibraryAsync({
            mediaTypes: ImagePicker.MediaTypeOptions.Images,
            allowsEditing: true,
            aspect: [1, 1],
            quality: 1,
        });

        if (!result.canceled) {
            setProfileImage(result.assets[0].uri);
            changeProfilePicture(result.assets[0])
        }
    };

    const handleClearImage = async () => {
        await updateUserData({newUserData: {pfp: null}});
        setProfileImage(null)
    }

    const pfpUri = profileImage && typeof profileImage === 'object' && 'uri' in profileImage ? profileImage.uri : profileImage;

    return (
        <ScrollView style={{paddingBottom: 100, flex: 1}}>
            <View style={styles.card}>
                <Text style={styles.subTit}>Your Profile</Text>
                <View row spread paddingH-15 centerV marginV-15>
                    <TouchableOpacity onPress={pickImage}>
                        <Image
                            key={pfpUri}
                            style={styles.pfp}
                            source={pfpUri ? {uri: pfpUri} : null}
                        />
                    </TouchableOpacity>

                    <TouchableOpacity onPress={pickImage}>
                        <Text style={styles.photoSet} color="#50be0c" onPress={pickImage}>
                            {profileData?.pfp ? "Change" : "Add"} Photo
                        </Text>
                    </TouchableOpacity>

                    {profileData?.pfp && (
                        <TouchableOpacity onPress={handleClearImage}>
                            <Text style={styles.photoSet}>Remove Photo</Text>
                        </TouchableOpacity>
                    )}
                </View>
                <View paddingH-15>
                    <Text text80 marginT-10 marginB-7 style={styles.label}>
                        First name
                    </Text>
                    <TextField
                        text70
                        placeholder="First name"
                        style={styles.txtBox}
                        value={firstName}
                        onChangeText={async (value) => {
                            setFirstName(value);
                        }}
                    />
                    <Text text80 marginT-10 marginB-7 style={styles.label}>
                        Last name
                    </Text>
                    <TextField
                        text70
                        placeholder="Last name"
                        style={styles.txtBox}
                        value={lastName}
                        onChangeText={async (value) => {
                            setLastName(value);
                        }}
                    />
                    <Text text80 marginT-10 marginB-7 style={styles.label}>
                        Email address
                    </Text>
                    <TextField
                        editable={false}
                        text70
                        placeholder="Email address"
                        value={user?.email?.toString()}
                        style={styles.txtBox}
                    />
                </View>
            </View>

            <View style={styles.card}>
                <Text style={styles.subTit}>Settings</Text>
                <Text style={styles.jakarta12}>Time Zone</Text>
                <View style={styles.viewPicker}>
                    <Picker
                        value={timeZone}
                        onChange={(item) => setTimeZone(item as string)}
                        showSearch
                        floatingPlaceholder
                        style={styles.inViewPicker}
                        trailingAccessory={
                            <View
                                style={{
                                    justifyContent: "center",
                                    alignItems: "center",
                                    height: "100%",
                                    marginTop: -38,
                                    paddingRight: 15,
                                }}
                            >
                                <Ionicons
                                    name={"chevron-down"}
                                    style={{alignSelf: "center"}}
                                    size={20}
                                    color={"#000000"}
                                />
                            </View>
                        }
                    >
                        {timeZoneItems}
                    </Picker>
                </View>
            </View>
        </ScrollView>
    );
};

const timeZoneItems = Object.keys(tz.zones)
    .sort()
    .map((zone) => (
        <Picker.Item key={zone} label={zone.replace("/", " / ").replace("_", " ")} value={zone}/>
    ));

const styles = StyleSheet.create({
    card: {
        marginVertical: 15,
        backgroundColor: "white",
        width: "100%",
        borderRadius: 12,
        paddingHorizontal: 20,
        paddingVertical: 21,
    },
    pfp: {
        aspectRatio: 1,
        width: 65.54,
        backgroundColor: "gray",
        borderRadius: 20,
    },
    txtBox: {
        backgroundColor: "#fafafa",
        borderRadius: 50,
        borderWidth: 2,
        borderColor: "#cecece",
        padding: 15,
        height: 45,
        fontFamily: "PlusJakartaSans_500Medium",
        fontSize: 13,
    },
    subTit: {
        fontFamily: "Manrope_500Medium",
        fontSize: 15,
    },
    label: {
        fontFamily: "PlusJakartaSans_500Medium",
        fontSize: 12,
        color: "#a1a1a1",
    },
    photoSet: {
        fontFamily: "PlusJakartaSans_500Medium",
        fontSize: 13.07,
    },
    jakarta12: {
        paddingVertical: 10,
        fontFamily: "PlusJakartaSans_500Medium",
        fontSize: 12,
        color: "#a1a1a1",
    },
    viewPicker: {
        borderRadius: 50,
        backgroundColor: Colors.grey80,
        marginBottom: 16,
        borderColor: Colors.grey50,
        borderWidth: 1,
        marginTop: 0,
        height: 40,
        zIndex: 10,
    },
    inViewPicker: {
        borderRadius: 50,
        paddingVertical: 12,
        paddingHorizontal: 16,
        marginBottom: 16,
        marginTop: -20,
        height: 40,
        zIndex: 10,
    },
});

export default MyProfile;