import {SafeAreaView} from "react-native-safe-area-context";
import {Button, Colors, Dialog, LoaderScreen, Text, View} from "react-native-ui-lib";
import React, {useCallback, useState} from "react";
import {useRouter} from "expo-router";
import QRIcon from "@/assets/svgs/QRIcon";
import {Camera, CameraView} from "expo-camera";
import {useLoginWithQrCode} from "@/hooks/firebase/useLoginWithQrCode";
import {useAuthContext} from "@/contexts/AuthContext";
import debounce from "debounce";

export default function Screen() {
    const router = useRouter()
    const {setRedirectOverride} = useAuthContext()
    const [hasPermission, setHasPermission] = useState<boolean | null>(null);
    const [showCameraDialog, setShowCameraDialog] = useState<boolean>(false);

    const {mutateAsync: signInWithQrCode, isLoading} = useLoginWithQrCode();

    const debouncedRouterReplace = useCallback(
        debounce(() => {
            router.push("/(unauth)/cal_sync");
        }, 300),
        []
    );

    const handleQrCodeScanned = async ({data}: { data: string }) => {
        setShowCameraDialog(false);
        setRedirectOverride(true);
        try {
            await signInWithQrCode({userId: data});
            debouncedRouterReplace()
        } catch (err) {
            console.log(err)
        }
    };

    const getCameraPermissions = async (callback: () => void) => {
        const {status} = await Camera.requestCameraPermissionsAsync();
        setHasPermission(status === "granted");
        if (status === "granted") {
            callback();
        }
    };

    const handleOpenQrCodeDialog = () => {
        getCameraPermissions(() => setShowCameraDialog(true));
    }

    return (
        <SafeAreaView style={{flex: 1}}>
            <View style={{flex: 1, padding: 21, paddingBottom: 45, paddingTop: "20%", alignItems: "center"}}>
                <View center>
                    <Text style={{fontSize: 30, fontFamily: 'Manrope_600SemiBold'}}>
                        Get started with Cally
                    </Text>
                </View>

                <View width={"100%"} gap-30>
                    <View>
                        <Button
                            label="Scan QR Code"
                            marginT-50
                            labelStyle={{
                                fontFamily: "PlusJakartaSans_400Regular",
                                fontSize: 16,
                                marginLeft: 10
                            }}
                            iconSource={() => <QRIcon color={"#07B8C7"}/>}
                            onPress={handleOpenQrCodeDialog}
                            style={{height: 50}}
                            color={Colors.black}
                            backgroundColor={Colors.white}
                        />
                        {/*    GOOGLE LOGIN HERE   */}
                    </View>

                    <View row center gap-20>
                        <View flexG style={{backgroundColor: "#E2E2E2", height: 2}}/>
                        <Text style={{fontSize: 16, fontFamily: 'PlusJakartaSans_300Light', color: "#7A7A7A"}}>
                            or
                        </Text>
                        <View flexG style={{backgroundColor: "#E2E2E2", height: 2}}/>
                    </View>

                    <View>
                        <Button
                            label="Contine with Email"
                            labelStyle={{
                                fontFamily: "PlusJakartaSans_400Regular",
                                fontSize: 16,
                                marginLeft: 10
                            }}
                            onPress={() => router.push("/(unauth)/sign_up")}
                            style={{height: 50, borderStyle: "solid", borderColor: "#E2E2E2", borderWidth: 2}}
                            color={Colors.black}
                            backgroundColor={"transparent"}
                        />
                    </View>
                </View>


                <View flexG/>

                <View row centerH gap-5>
                    <Text style={{
                        fontFamily: "PlusJakartaSans_300Light",
                        fontSize: 16,
                        color: "#484848"
                    }} center>
                        Already have an account?
                    </Text>

                    <Button
                        label="Log in"
                        link
                        onPress={() => router.push("/(unauth)/sign_in")}
                        labelStyle={[
                            {
                                fontFamily: "PlusJakartaSans_500Medium",
                                fontSize: 16,
                                color: "#919191",
                            },
                            {fontSize: 16, textDecorationLine: "none", color: "#fd1775"},
                        ]}
                    />
                </View>
            </View>

            {/*    Legacy, move into separate component   */}
            {/* Camera Dialog */}
            <Dialog
                visible={showCameraDialog}
                onDismiss={() => setShowCameraDialog(false)}
                bottom
                width="100%"
                height="70%"
                containerStyle={{padding: 15, backgroundColor: "white"}}
            >
                <Text center style={{fontSize: 16}} marginB-15>
                    Scan a QR code presented from your family member of provider.
                </Text>
                {hasPermission === null ? (
                    <Text>Requesting camera permissions...</Text>
                ) : !hasPermission ? (
                    <Text>No access to camera</Text>
                ) : (
                    <CameraView
                        style={{flex: 1, borderRadius: 15}}
                        onBarcodeScanned={handleQrCodeScanned}
                        barcodeScannerSettings={{
                            barcodeTypes: ["qr"],
                        }}
                    />
                )}
                <Button
                    label="Cancel"
                    onPress={() => setShowCameraDialog(false)}
                    backgroundColor="#fd1775"
                    style={{margin: 10, marginBottom: 30}}
                />
            </Dialog>


            {isLoading && (
                <LoaderScreen overlay message={"Signing in..."} backgroundColor={Colors.white} color={Colors.grey40}/>
            )}
        </SafeAreaView>
    )
}