import React, { useState } from "react";
import {Dialog, TextInput, useTheme, Button, Text, List, Portal} from "react-native-paper";
import { View, FlatList } from "react-native";
import Slider from "@react-native-community/slider";
import axios from "axios";
import * as Location from "expo-location";
import log from "@/util/log";

interface LocationScreenProps {
    visible: boolean;
    setChanged: (dataChanged: boolean) => void;
    setTheme: (theme: string) => void;
    currentTheme: string;
    onClose: () => void;
}

export const API_URL = process.env.EXPO_PUBLIC_API_URL;
const BUTTON_WIDTH = 260;

type Park = {
    name: string;
    address: string;
    city: string;
    state: string;
    zip: string;
    location: {
        coordinates: [number, number];
    };
};

const LocationScreen: React.FC<LocationScreenProps> = ({ visible, setTheme, currentTheme, setChanged, onClose }) => {
    const theme = useTheme();
    const [zip, setZip] = useState("");
    const [distance, setDistance] = useState(25);
    const [loading, setLoading] = useState(false);
    const [locLoading, setLocLoading] = useState(false);
    const [parks, setParks] = useState<Park[]>([]);
    const [hasSearched, setHasSearched] = useState(false);

    // Call the parks endpoint with coordinates
    const fetchNearbyParks = async (longitude: number, latitude: number) => {
        try {
            const response = await axios.post(API_URL + "/parkLookup", { "Lon": longitude, "Lat": latitude, "Dist": distance });
            log.error("Nearby Parks:", response.data);
            setParks(response.data);
        } catch (err) {
            log.error("Nearby Parks Error:", err);
            setParks([]);
        } finally {
            setHasSearched(true);
        }
    };

    // Zip code handler
    const handleSubmit = async () => {
        if (!zip) return;
        setLoading(true);
        try {
            const response = await axios.post(API_URL + "/zipLookup", { zip });
            log.error("Zip Lookup Response:", response.data);
            const longitude = response.data[0];
            const latitude = response.data[1];
            await fetchNearbyParks(longitude, latitude);
        } catch (err) {
            log.error(err);
        }
        setLoading(false);
    };

    // Geolocation handler
    const handleGetLocation = async () => {
        setLocLoading(true);
        try {
            let { status } = await Location.requestForegroundPermissionsAsync();
            if (status !== 'granted') {
                log.error("Permission to access location was denied");
                setLocLoading(false);
                return;
            }
            let location = await Location.getCurrentPositionAsync({});
            const { longitude, latitude } = location.coords;
            log.error([longitude, latitude]);
            await fetchNearbyParks(longitude, latitude);
        } catch (err) {
            log.error("Location Error:", err);
        }
        setLocLoading(false);
    };

    // Render each park item
    const renderItem = ({ item }: { item: Park }) => (
        <List.Item
            title={item.name}
            description={
                `${item.address}\n${item.city}, ${item.state} ${item.zip}`
            }
            left={props => <List.Icon {...props} icon="paw" />}
            style={{
                backgroundColor: theme.colors.surface,
                borderRadius: 8,
                marginBottom: 8,
                elevation: 1,
            }}
            titleStyle={{ fontWeight: "bold" }}
            descriptionNumberOfLines={2}
        />
    );

    return (
        <Portal>
            <Dialog visible={visible}
                    onDismiss={() => {
                        onClose();
                    }}
                    style={{ backgroundColor: theme.colors.background }}>
                <Dialog.Title style={{color: theme.colors.primary, textAlign: 'center'}}>Location</Dialog.Title>
                <Dialog.Content style={{ maxHeight: 500, justifyContent: "center", alignItems: "center" }}>
                    <View style={{ alignItems: "center", width: "100%" }}>
                        <Button mode="outlined" onPress={handleGetLocation} loading={locLoading} disabled={locLoading}
                            style={{ marginBottom: 12, width: BUTTON_WIDTH }}>Use My Location</Button>
                        <Text style={{ marginBottom: 12, color: theme.colors.primary, fontWeight: "bold" }}>OR</Text>
                        <View style={{
                                flexDirection: "row",
                                alignItems: "center",
                                width: BUTTON_WIDTH,
                                justifyContent: "center",
                                marginBottom: 4,
                            }}
                        >
                            <TextInput
                                label="Enter Zip Code"
                                mode="outlined"
                                value={zip}
                                onChangeText={setZip}
                                style={{
                                    flex: 3,
                                    marginRight: 6,
                                    fontFamily: "SpaceReg",
                                    minWidth: 0,
                                }}
                                placeholderTextColor={theme.colors.primary}
                                textColor={theme.colors.primary}
                                theme={{ colors: { text: theme.colors.primary } }}
                            />
                            <Button
                                mode="contained"
                                onPress={handleSubmit}
                                loading={loading}
                                disabled={!zip || loading}
                                style={{
                                    flex: 2,
                                    minWidth: 0,
                                    height: 50,
                                }}
                                contentStyle={{ height: 50 }}
                            >
                                Submit
                            </Button>
                        </View>
                        <View style={{ width: BUTTON_WIDTH, marginTop: 10, alignItems: "center" }}>
                            <Text style={{ color: theme.colors.primary, marginBottom: 2 }}>
                                Distance: {distance} mile{distance !== 1 ? "s" : ""}
                            </Text>
                            <Slider
                                style={{ width: "100%", height: 36 }}
                                minimumValue={1}
                                maximumValue={40}
                                step={1}
                                value={distance}
                                onValueChange={setDistance}
                                minimumTrackTintColor={theme.colors.primary}
                                maximumTrackTintColor={theme.colors.onSurfaceDisabled || "#ccc"}
                                thumbTintColor={theme.colors.primary}
                            />
                        </View>
                        {/* Parks List */}
                        {hasSearched && (
                            <View style={{ width: BUTTON_WIDTH, marginTop: 18, maxHeight: 200 }}>
                                <Text style={{
                                    fontWeight: "bold",
                                    fontSize: 18,
                                    marginBottom: parks != null ? 8 : 2,
                                    color: theme.colors.primary
                                }}>
                                    Nearby Dogparks
                                </Text>
                                {parks != null ? (
                                    <FlatList
                                        data={parks}
                                        keyExtractor={(_, idx) => String(idx)}
                                        renderItem={renderItem}
                                        showsVerticalScrollIndicator={false}
                                        style={{ maxHeight: 170 }}
                                    />
                                ) : (
                                    <Text style={{ color: theme.colors.onSurface, textAlign: "center", marginTop: 12 }}>
                                        No parks found in range.
                                    </Text>
                                )}
                            </View>
                        )}
                    </View>
                </Dialog.Content>
            </Dialog>
        </Portal>
    );
};

export default LocationScreen;