import {useState} from "react";
import {
    StyleSheet,
    Platform,
    KeyboardAvoidingView,
    ScrollView,
    Image,
    View,
    Alert,
} from "react-native";
import {TextInput, Button, Snackbar, Text, useTheme} from "react-native-paper";
import {requestCameraPermissionsAsync, launchCameraAsync} from 'expo-image-picker';
import * as Location from 'expo-location';
import useLocationStore from "@/locationStore";

export default function FormScreen() {
    const [formData, setFormData] = useState({
        name: "",
        description: "",
        image: "",
        area: 0,
        population: 0,
        latitude: 0,
        longitude: 0,
    });
    const [message, setMessage] = useState("");
    const [visible, setVisible] = useState(false);
    const [picture, setPicture] = useState(null);
    const [imageMethod, setImageMethod] = useState(null);
    const [location, setLocation] = useState < Location.LocationObject | null > (null);
    const theme = useTheme();

    const addLocation = useLocationStore((state) => state.addLocation);

    const handleAddLocation = async () => {
        if (
            formData.name &&
            formData.description &&
            formData.image &&
            formData.area &&
            formData.population &&
            formData.latitude &&
            formData.longitude
        ) {
            const newLocation = {
                id: Date.now(),
                name: formData.name,
                description: formData.description,
                image: formData.image,
                area: parseFloat(formData.area),
                population: parseInt(formData.population),
                latitude: parseFloat(formData.latitude),
                longitude: parseFloat(formData.longitude),
            };

            const added = await addLocation(newLocation);
            setFormData({
                name: "",
                description: "",
                image: "",
                area: 0,
                population: 0,
                latitude: 0,
                longitude: 0
            });
            setPicture(null);
            setImageMethod(null);

            if (added != null) {
                setMessage("Lokalizacja została dodana!");
                setVisible(true);
            } else {
                setMessage("Wystąpił błąd podczas dodawania lokalizacji!");
                setVisible(true);
            }
        } else {
            setMessage("Wypełnij wszystkie pola!");
            console.log(formData);
            setVisible(true);
        }
    };

    const takePicture = async () => {
        const {status} = await requestCameraPermissionsAsync();
        if (status !== 'granted') {
            setMessage("Brak uprawnień do kamery!");
            setVisible(true);
            return;
        }
        const result = await launchCameraAsync({
            allowsEditing: false,
            base64: true,
        });

        if (!result.canceled && result.assets && result.assets.length > 0) {
            const image = result.assets[0];
            setPicture(image.uri);
            setFormData({...formData, image: image.base64});
        }
    }

    async function getCurrentLocation() {

        let {status} = await Location.requestForegroundPermissionsAsync();
        if (status !== 'granted') {
            console.log('Permission to access location was denied');
            Alert.alert("Błąd", "Nie udało się uzyskać dostępu do pobierania lokalizacji");
            return;
        }

        try {
            let location = await Location.getCurrentPositionAsync({});
            setLocation(location);
            setFormData({
                ...formData,
                latitude: location.coords.latitude,
                longitude: location.coords.longitude
            });
            Alert.alert("Sukces!", "Pobrano lokalizację\n" +
                "Szerokość geograficzna: " + location.coords.latitude + "\n" +
                "Długość geograficzna: " + location.coords.longitude);
        } catch (error) {
            Alert.alert("Błąd", "Nie udało się pobrać lokalizacji");
            console.error(error);
        }
    }

    const selectImageMethod = (method) => {
        setImageMethod(method);
        if (method === 'camera') {
            takePicture()
        } else {
            setFormData({...formData, image: ""});
            setPicture(null);
        }
    }

    return (
        <KeyboardAvoidingView
            style={{flex: 1}}
            behavior={Platform.OS === "ios" ? "padding" : "height"}
        >
            <ScrollView contentContainerStyle={styles.container} contentInsetAdjustmentBehavior="automatic"
                        style={[{backgroundColor: theme.colors.background}]}
            >
                <Snackbar
                    visible={visible}
                    onDismiss={() => setVisible(false)}
                    duration={3000}
                >
                    {message}
                </Snackbar>
                <Text style={styles.label} variant="labelLarge">Jak chcesz dodać zdjęcie?</Text>
                <View style={styles.imageMethodButtons}>
                    <Button
                        mode={imageMethod === 'link' ? "contained" : "outlined"}
                        onPress={() => selectImageMethod('link')}
                        style={styles.methodButton}
                    >
                        Użyj linku
                    </Button>
                    <Button
                        mode={imageMethod === 'camera' ? "contained" : "outlined"}
                        onPress={() => selectImageMethod('camera')}
                        style={styles.methodButton}
                    >
                        Zrób zdjęcie
                    </Button>
                </View>

                {imageMethod === 'link' && (
                    <TextInput
                        mode="outlined"
                        label="Link do zdjęcia"
                        placeholder="Wpisz link do zdjęcia"
                        multiline={true}
                        style={{margin: 10, width: "100%"}}
                        value={formData.image}
                        onChangeText={(e) => setFormData({...formData, image: e})}
                    />
                )}


                {picture && (
                    <View style={styles.imageContainer}>
                        <Image
                            source={{uri: picture}}
                            style={styles.image}
                        />
                    </View>
                )}
                <TextInput
                    mode="outlined"
                    label="Nazwa"
                    placeholder="Wpisz nazwę"
                    style={{margin: 10, width: "100%"}}
                    value={formData.name}
                    onChangeText={(e) => setFormData({...formData, name: e})}
                />
                <TextInput
                    mode="outlined"
                    label="Opis"
                    placeholder="Wpisz opis"
                    style={{margin: 10, width: "100%"}}
                    multiline={true}
                    value={formData.description}
                    onChangeText={(e) => setFormData({...formData, description: e})}
                />
                <TextInput
                    mode="outlined"
                    label="Powierzchnia"
                    placeholder="Wpisz powierzchnię"
                    style={{margin: 10, width: "100%"}}
                    value={formData.area}
                    keyboardType="numeric"
                    onChangeText={(e) => setFormData({...formData, area: e})}
                />
                <TextInput
                    mode="outlined"
                    label="Ludność"
                    placeholder="Wpisz liczbę ludności"
                    style={{margin: 10, width: "100%"}}
                    value={formData.population}
                    keyboardType="numeric"
                    onChangeText={(e) => setFormData({...formData, population: e})}
                />
                <Button
                    style={{margin: 10, width: "100%"}}
                    icon="plus-circle-outline"
                    mode={"contained"}
                    onPress={handleAddLocation}
                >
                    Dodaj
                </Button>

                <Button
                    style={{margin: 10, width: "100%"}} mode={"contained"}
                    onPress={getCurrentLocation}
                    icon={location ? "check-circle-outline" : "map-marker-outline"}
                >
                    Pobierz aktualną lokalizację
                </Button>
            </ScrollView>
        </KeyboardAvoidingView>
    );
}

const styles = StyleSheet.create({
    container: {
        // backgroundColor: "#25292e",
        alignItems: "center",
        padding: 10,
        flexGrow: 1,
    },
    imageContainer: {
        width: "100%",
        alignItems: "flex-start",
        marginVertical: 10,
    },
    image: {
        width: 150,
        height: 150,
        borderStyle: "solid",
        borderWidth: 1,
        borderRadius: 5,
    },
    imageMethodButtons: {
        flexDirection: 'row',
        justifyContent: 'space-between',
        width: '100%',
        marginVertical: 10,
    },
    methodButton: {
        flex: 1,
        marginHorizontal: 5,
    },
    label: {
        marginTop: 10,
        marginBottom: 10,
        verticalAlign: "middle",
        textAlign: "center",
    }
});