import React, { useState, useEffect, useRef } from 'react';
import { View, Text } from 'react-native';
import MapView, { Marker, Polyline, PROVIDER_DEFAULT } from 'react-native-maps';
import { useAppTheme } from '@theme';
import { Coordinates } from '@app-types/index';
import { getStyles } from './mapView.styles';
import {
  getRouteDirections,
  getHaversineDistance,
} from '@services/locationService';

interface MapViewComponentProps {
  origin?: Coordinates;
  destination?: Coordinates;
  currentLocation?: Coordinates;
  showRoute?: boolean;
  style?: any;
}

export const MapViewComponent: React.FC<MapViewComponentProps> = ({
  origin,
  destination,
  currentLocation,
  showRoute = false,
  style,
}) => {
  const { colors } = useAppTheme();
  const styles = getStyles(colors);
  const mapRef = useRef<MapView>(null);
  const [routeCoords, setRouteCoords] = useState<Coordinates[]>([]);
  const lastFetchedOrigin = useRef<Coordinates | null>(null);

  const defaultRegion = {
    latitude: currentLocation?.latitude || origin?.latitude || 12.9716,
    longitude: currentLocation?.longitude || origin?.longitude || 77.5946,
    latitudeDelta: 0.05,
    longitudeDelta: 0.05,
  };

  // Fetch routing coordinates
  useEffect(() => {
    let active = true;
    if (showRoute && origin && destination) {
      // Calculate distance from last fetched origin
      if (lastFetchedOrigin.current) {
        const dist = getHaversineDistance(origin, lastFetchedOrigin.current);
        // If driver moved less than 50 meters (0.05 km), skip re-fetching to prevent spamming
        if (dist < 0.05 && routeCoords.length > 0) {
          return;
        }
      }

      getRouteDirections(origin, destination)
        .then(points => {
          if (active) {
            setRouteCoords(points);
            lastFetchedOrigin.current = origin;
          }
        })
        .catch(err => {
          console.error('Error in MapViewComponent getRouteDirections:', err);
          if (active) {
            setRouteCoords([origin, destination]);
          }
        });
    } else {
      setRouteCoords([]);
      lastFetchedOrigin.current = null;
    }
    return () => {
      active = false;
    };
  }, [
    showRoute,
    origin?.latitude,
    origin?.longitude,
    destination?.latitude,
    destination?.longitude,
    routeCoords.length,
  ]);

  // Adjust camera to fit all coordinates
  useEffect(() => {
    const coordsToFit: Coordinates[] = [];
    if (currentLocation) {
      coordsToFit.push(currentLocation);
    }
    if (origin) {
      coordsToFit.push(origin);
    }
    if (destination) {
      coordsToFit.push(destination);
    }

    if (coordsToFit.length > 0 && mapRef.current) {
      const timer = setTimeout(() => {
        mapRef.current?.fitToCoordinates(coordsToFit, {
          edgePadding: { top: 60, right: 60, bottom: 60, left: 60 },
          animated: true,
        });
      }, 500);
      return () => clearTimeout(timer);
    }
  }, [
    currentLocation?.latitude,
    currentLocation?.longitude,
    origin?.latitude,
    origin?.longitude,
    destination?.latitude,
    destination?.longitude,
  ]);

  return (
    <View style={[styles.container, style]}>
      <MapView
        ref={mapRef}
        provider={PROVIDER_DEFAULT}
        style={styles.map}
        initialRegion={defaultRegion}
        showsUserLocation={true}
        loadingEnabled={true}
      >
        {currentLocation && (
          <Marker
            coordinate={currentLocation}
            title="Your Location"
            pinColor={colors.primary}
          />
        )}
        {origin && (
          <Marker
            coordinate={origin}
            title="Pickup Location"
            pinColor={colors.statusOffline}
          />
        )}
        {destination && (
          <Marker
            coordinate={destination}
            title="Drop Location"
            pinColor={colors.statusOnline}
          />
        )}
        {showRoute && routeCoords.length > 0 && (
          <Polyline
            coordinates={routeCoords}
            strokeColor={colors.primary}
            strokeWidth={4}
          />
        )}
      </MapView>
      <View style={styles.mockOverlay}>
        <Text style={styles.mockText}>📍 Live Navigation Map Active</Text>
      </View>
    </View>
  );
};

export default MapViewComponent;