import React, { useEffect, useRef, useState } from 'react';
import {Image, StyleSheet, View, TouchableOpacity, Text, Alert, Animated,} from 'react-native';
import MapboxGL from '@react-native-mapbox-gl/maps';
import 'react-native-get-random-values'
import Modal from 'react-native-modal';
import SlidingUpPanel from 'rn-sliding-up-panel';
import LandmarkDetails from '../components/LandmarkDetails';
import {Icons} from '../globals.js';
import Icon from 'react-native-vector-icons/FontAwesome';
import VoiceView from '../components/VoiceView';
import RNLocation from 'react-native-location';
import { polygon, point, lineString, booleanPointInPolygon, booleanIntersects, buffer } from '@turf/turf';
import polyline from '@mapbox/polyline';
import PlaceDetails from '../components/PlaceDetails';
import axios from 'axios';
import { useMapState } from '../contexts/MapContext';
import { useAuthState } from '../contexts/AuthContext';
import { API_URL } from '../globals';
import { adaptIcon } from '../globals';

MapboxGL.setAccessToken('pk.eyJ1IjoiY2Rtb3NzIiwiYSI6ImNrbmhuOXJzcDIyd20ycW1pYm8xaGI0aGUifQ.j04Sp636N9Wg4N9j9t2tXw');

const directionsUrl = "https://maps.googleapis.com/maps/api/directions/json?mode=walking&alternatives=true&key=AIzaSyD06YUMazlb4Fu0Q81y_YNyEBz8PmtZyeY";

RNLocation.configure({
  distanceFilter: 1
});

const Map = ({navigation}) => {
  // state
  const [tempPoint, setTempPoint] = useState(null);
  const [placesIsVisible, togglePlacesModal] = useState(false);
  const [addIsVisible, toggleAddModal] = useState(false);
  const [lmDetailsIsVisible, toggleLMDetailsModal] = useState(false);
  const [routePoints, setRoutePoints] = useState({first: null, second: null});
  const [routes, setRoutes] = useState([]);
  const [routingActive, toggleRouting] = useState(false);

  // refs
  const voiceModal = useRef();
  const map = useRef();
  const panel = useRef();

  // contexts
  const { mapState, mapDispatch } = useMapState(); 
  const { authState, authDispatch } = useAuthState(); 

  let panelPosition = new Animated.Value(0);
  

  useEffect(() => {
    async function handleLocation() {
      if (mapState.location == null && !mapState.locationPermission) {
        mapDispatch({type: 'UPDATE_LOCATION_PERMISSION', payload: await RNLocation.requestPermission({
          ios: "whenInUse",
          android: {
            detail: "fine",
            rationale: {
              title: "We need to access your location",
              message: "We use your location to provide convenient features such as geo-activated notifications and adding landmarks via voice",
              buttonPositive: "Grant permission",
              buttonNegative: "No thanks"
            }
          }
        })})
      }
    }
    handleLocation();

    const panelPositionListener = panelPosition.addListener(({value}) => {
      if (value == 0) {
        toggleRouting(false);
      }
      if (value > 0) {
        toggleRouting(true);
      }
    })

    return() => {
      panelPosition.removeListener(panelPositionListener)
      // unsubscribePermission();
      // unsubscribeLocation();
    }
  });

  const changeSelectedLandmark = (landmark) => {
    mapDispatch({ type:"UPDATE_SELECTED_LANDMARK", payload: landmark});
  }

  const showLandmarkDetails = (landmark) => {
    console.log(landmark)
    // changeSelectedLandmark(landmark);
    // toggleLMDetailsModal(true);
  }

  const openVoiceModal = () => {
    if (!mapState.locationPermission) {
      Alert.alert('You need to provide location permission to use this feature.')
    } 
    else {
      RNLocation.getLatestLocation({timeout: 100}).then(location => {
        mapDispatch({ type:"UPDATE_LOCATION", payload: location});
        voiceModal.current.open();
      })
      
    }
  }

  const handleMapTouch = (e) => {
    if (routingActive) {
      setRoutePoint(e.geometry.coordinates);
    }
    else {
      setTempPoint(e.geometry.coordinates);

      // sets selected landmark with barebones object to prime for new landmark
      mapDispatch({ type:"UPDATE_SELECTED_LANDMARK", payload: {
        longitude: e.geometry.coordinates[0], 
        latitude: e.geometry.coordinates[1], 
        icon: 'barrier', 
        title: '', 
        desc: ''
      }});
      toggleAddModal(true);
    }
  }

  const handlePlaceTouch = (e) => {
    if (routingActive) {
      setRoutePoint([e.coordinates.longitude, e.coordinates.latitude]);
    }
    else {
      setTempPoint([e.coordinates.longitude, e.coordinates.latitude]); 
      // gathers all places overlapping point that was touched
      const touchedPlaces = e.features.filter(f => {
        return booleanPointInPolygon(point([e.coordinates.longitude, e.coordinates.latitude]), polygon(f.geometry.coordinates));
      });

      // set selected landmark to barebones to prime for adding a landmark 
      mapDispatch({ type:"UPDATE_SELECTED_LANDMARK", payload: {
        longitude: e.coordinates.longitude, 
        latitude: e.coordinates.latitude, 
        icon: 'barrier', 
        title: 'New Landmark', 
        desc: ''
      }});

      if (touchedPlaces.length == 0) {
        toggleAddModal(true);
      }
      // otherwise set state with gathered places and show places modal
      else {
        mapDispatch({ type:"UPDATE_SELECTED_PLACES", payload: touchedPlaces});
        mapDispatch({ type:"UPDATE_SELECTED_PLACE", payload: {
          id: touchedPlaces[0].id, 
          name: touchedPlaces[0].properties.name,
          desc: touchedPlaces[0].properties.desc,
          tips: touchedPlaces[0].properties.tips,
          dateAdded: touchedPlaces[0].properties.dateAdded,
          postedBy: touchedPlaces[0].properties.postedBy,
          rating: touchedPlaces[0].properties.rating,
        }});
        togglePlacesModal(true);
      }
    }
  }

  const setRoutePoint = (point) => {
    if (routePoints.first) {
      setRoutePoints({...routePoints, second: point});
    }
    else {
      setRoutePoints({first: point});
    }
  }

  const buildRoutingUrl = async () => {
    const routingUrl = directionsUrl + "&origin=" + routePoints.first[1] + ',' + routePoints.first[0] + '&destination=' + routePoints.second[1] + ',' + routePoints.second[0];
    const response = await axios.get(routingUrl); 
    let routes = response.data.routes.map((route, i) => {
      return {
        type: 'Feature',
        properties: {
          color: i == 0 ? '#007FFF' : '#888888',
          opacity: i == 0 ? 1 : 0.6
        },
        geometry: {
          coordinates: polyline.decode(route.overview_polyline.points).map(coords => [coords[1], coords[0]]), 
          type: 'LineString'
        }
      }
    });

    mapState.landmarks.forEach(landmark => {
      const lmBuffer = buffer(point([landmark.longitude, landmark.latitude]), 10, {units: 'meters'}).geometry.coordinates
      routes = routes.map(route => {
        if (booleanIntersects(lineString(route.geometry.coordinates), polygon(lmBuffer))) {
          console.log(route);
          return {...route, properties: {color: 'red', opacity: .5,}};
        }
        return route;
      });
    })

    setRoutes(routes);
  }

  const clearRoutes = () => {
    setRoutePoints({first: null, second: null});
    setRoutes([]);
  }

  const handleDrag = (value) => {
    console.log(value);
  }

  const addLandmark = () => {
    clearModals();
    console.log(tempPoint);
    navigation.navigate("LandmarkForm");
  }

  const removeTempPoint = () => {
    setTempPoint(null);
  }

  const editLandmark = () => {
    navigation.navigate("LandmarkForm");
  }

  const closeModal = (message) => {
    toggleLMDetailsModal(false);
    if (message != null) {
      Alert.alert(message); 
    }
  };

  const clearModals = () => {
    toggleLMDetailsModal(false);
    toggleAddModal(false);
    togglePlacesModal(false);
  };

  const updateDisplayedLandmarks = async (e) => {
    const neCorner = e.properties.visibleBounds[0];
    const swCorner = e.properties.visibleBounds[1];

    try {
      const response = await axios.get(`${API_URL}/api/landmarkinregion/${neCorner[0]}/${neCorner[1]}/${swCorner[0]}/${swCorner[1]}`, {
        headers: {
          "Authorization": "Bearer " + authState.accessToken
        }
      });

      const landmarks = JSON.parse(response.data.landmarks);
      mapDispatch({type: "UPDATE_LANDMARKS", payload: landmarks.data.features})
      //console.log(landmarks.data.features[0])
    } catch (error) {
      console.log(error.response.data);
    }
    
  }

  return(
    <View style={styles.container}>
      <View style={styles.mapHeader}>
        <TouchableOpacity style={{width: '25%', height: '100%', justifyContent: 'center'}} onPress={() => {clearModals(); navigation.jumpTo('Account');}}>
          <Image style={{width: 40, height: 40, borderRadius: 100, marginLeft: 20}} source={require('../assets/default-pfp.png')}/>
        </TouchableOpacity>
        <Text style={{color: 'white', fontSize: 20, marginRight: 20}}>atlas</Text>
      </View>
      <View style={styles.mapContainer}>
        <MapboxGL.MapView 
          ref={map} 
          style={styles.mapbox} 
          onRegionIsChanging={updateDisplayedLandmarks}
          onPress={e => handleMapTouch(e)}>
          {/* <MapboxGL.UserLocation/> */}
          {/* <MapboxGL.Camera followUserLocation followUserMode={'normal'} zoomLevel={9} /> */}
          <MapboxGL.Camera zoomLevel={9} centerCoordinate={[-113.52511882781982,53.52385492230552]} />
          {tempPoint && 
            <MapboxGL.PointAnnotation id="temp" coordinate={tempPoint} />
          }
          {routePoints.first && 
            <MapboxGL.PointAnnotation id="first" coordinate={routePoints.first} />
          }
          {routePoints.second && 
            <MapboxGL.PointAnnotation id="second" coordinate={routePoints.second} />
          }
          {mapState.landmarks.map(landmark => {
          return (
          <MapboxGL.PointAnnotation onSelected={() => console.log(landmark)} key={landmark.properties.id} id={landmark.properties.id} coordinate={[landmark.geometry.coordinates[0], landmark.geometry.coordinates[1]]} >
                <Image source={Icons[adaptIcon(landmark.properties.icon)]} style={{width: 22, height: 30}} />
          </MapboxGL.PointAnnotation>
          )})}
          <MapboxGL.ShapeSource 
            onPress={e => handlePlaceTouch(e)} 
            fill
            id="test" 
            shape={{type: "FeatureCollection", features: mapState.places.map(place => {
              return {
                type: 'Feature',
                id: place.id,
                properties: {
                  name: place.name,
                  tips: place.tips,
                  rating: place.rating,
                  postedBy: place.postedBy,
                  dateAdded: place.dateAdded,
                  color: place.color,
                },
                geometry: {
                  "type": "Polygon",
                  "coordinates": place.coordinates
                }
              }
            })}}>
            <MapboxGL.FillLayer 
              id="places" 
              style={{
                fillColor: ["get", "color"], 
                fillOpacity: .3}}/>
          </MapboxGL.ShapeSource>
          <MapboxGL.ShapeSource 
            onPress={e => handlePlaceTouch(e)} 
            fill
            id="buffers" 
            shape={{type: "FeatureCollection", features: mapState.landmarks.map(landmark => {
              return {
                type: 'Feature',
                id: landmark.properties.id,
                properties: {
                },
                geometry: buffer(point([landmark.geometry.coordinates[0], landmark.geometry.coordinates[1]]), 10, {units: "meters"}).geometry
              }
            })}}>
            <MapboxGL.FillLayer 
              id="buffers" 
              style={{
                fillColor: 'black', 
                fillOpacity: .3}}/>
          </MapboxGL.ShapeSource>
          <MapboxGL.ShapeSource 
            id="line" 
            shape={{type: "FeatureCollection", features: routes}}>
              <MapboxGL.LineLayer
              id="lines"
              style={{lineWidth: 7,  lineColor: ["get", "color"], lineOpacity: ['get', 'opacity'], lineCap: 'round', lineJoin: 'round'}} />
            </MapboxGL.ShapeSource>
        </MapboxGL.MapView>
        {!routingActive ? 
        <TouchableOpacity style={styles.routeBtn} onPress={() => panel.current.show(100)}>
          <Icon name='route' size={20} name="map" color='white' />
        </TouchableOpacity> : null}
        <TouchableOpacity style={styles.micBtn} name="microphone" onPress={openVoiceModal}>
          <Icon name='microphone' size={20} color='white' />
        </TouchableOpacity>
      </View>
      {mapState.locationPermission ? <VoiceView ref={voiceModal} changeSelectedLandmark={changeSelectedLandmark} editLandmark={editLandmark} style={styles.voiceModal} onPress={openVoiceModal}/> : null}
      <Modal 
        isVisible={lmDetailsIsVisible} 
        style={{height: 520, margin: 0, justifyContent: 'flex-end'}} 
        onBackButtonPress={() => toggleLMDetailsModal(false)}
        onBackdropPress={() => toggleLMDetailsModal(false)}
        onSwipeComplete={() => toggleLMDetailsModal(false)}
        swipeDirection={['up', 'down']}>
        <LandmarkDetails closeModal={clearModals} editLandmark={editLandmark}/>
      </Modal>
      <Modal 
        style={{height: 520, margin: 0, justifyContent: 'flex-end',}}
        isVisible={placesIsVisible} 
        onBackButtonPress={() => togglePlacesModal(false)}
        onBackdropPress={() => togglePlacesModal(false)}
        onSwipeComplete={() => togglePlacesModal(false)}
        swipeDirection={['up', 'down']}
        onModalWillHide={removeTempPoint}>
          <PlaceDetails closeModal={clearModals} addLandmark={addLandmark}/>
      </Modal>
      <Modal 
        style={{justifyContent: 'center',}}
        isVisible={addIsVisible} 
        onBackButtonPress={() => toggleAddModal(false)}
        onBackdropPress={() => toggleAddModal(false)}
        onSwipeComplete={() => toggleAddModal(false)}
        swipeDirection={['up','down']}
        onModalWillHide={removeTempPoint}>
        <View style={{maxHeight: 100, backgroundColor: '#df3f3f'}}>
            <Text style={styles.addTitle}>Add landmark here?</Text>
            <View style={{flexDirection: 'row', justifyContent: 'flex-end', alignItems: 'center', }}>
            <TouchableOpacity style={{marginRight: 40, height: 50}} onPress={() => toggleAddModal(false)}>
              <Text style={{color: 'white'}}>Cancel</Text>
            </TouchableOpacity>
            <TouchableOpacity style={{marginRight: 40, height: 50}} onPress={addLandmark}>
              <Text style={{color: 'white'}}>Add</Text>
            </TouchableOpacity>
          </View>
        </View>
      </Modal>
      <SlidingUpPanel 
        animatedValue={panelPosition}
        ref={panel} 
        showBackdrop={false} 
        allowDragging={false} 
        onDragEnd={() => console.log('test')}
        onMomentumDragEnd={() => console.log('test')}
        draggableRange={{top: 100, bottom: 0}}>
        <View style={{padding: 20, paddingRight: 10, height: 100,backgroundColor: '#df3f3f'}}>
          <Text style={{color: 'white'}}>Select points</Text>
          {routePoints.first || routePoints.second ?
          <View style={{flexDirection: 'row', marginTop: 20, justifyContent: 'flex-end'}}>
          {routePoints.first && routePoints.second ?
          <TouchableOpacity onPress={buildRoutingUrl} style={{backgroundColor: 'white', alignSelf: 'flex-end', alignItems: 'center', justifyContent: 'center', width: "40%", height: 30, marginRight: 10}}>
            <Text style={{color: 'black'}}>Show directions</Text>
          </TouchableOpacity> : null }
          <TouchableOpacity onPress={clearRoutes} style={{backgroundColor: 'white', alignSelf: 'flex-end', alignItems: 'center', justifyContent: 'center', width: "40%", height: 30,}}>
            <Text style={{color: 'black'}}>Clear</Text>
          </TouchableOpacity>
          </View> : null } 
        </View>
      </SlidingUpPanel>
    </View>
  )
}

const styles = StyleSheet.create({
  container: {
    flex: 1
  },
  mapHeader: {
    justifyContent: 'space-between',
    flexDirection: 'row',
    alignItems: 'center',
    height: '9%',
    zIndex: 5,
    backgroundColor: '#df3f3f',
  },
  mapContainer: {
    height: '100%',
    width: '100%',
    backgroundColor: 'white',
  },
  markerContainer: {
    height: 50,
    width: 50,
    backgroundColor: 'white',
  },
  markerImg: {
    height: 25,
    width: 25
  },
  mapbox: {
    flex: 1,
  },
  routeBtn: {
    position: 'absolute',
    backgroundColor: '#df3f3f',
    justifyContent: 'center',
    alignItems: 'center',
    borderRadius: 40,
    bottom: 150,
    right: 20,
    zIndex: 5,
    width: 60,
    height: 60,
  },
  micBtn: {
    position: 'absolute',
    backgroundColor: '#df3f3f',
    justifyContent: 'center',
    alignItems: 'center',
    borderRadius: 40,
    bottom: 70,
    right: 20,
    zIndex: 5,
    width: 60,
    height: 60,
  },
  addModal: {
    backgroundColor: '#df3f3f',
    height: 100,
  },
  voiceModal: {
    backgroundColor: '#df3f3f',
    height: 200,

  },  
  addTitle: {
    color: 'white',
    fontSize: 13,
    marginTop: 20,
    marginLeft: 20
  },
  placesTitle: {
    fontSize: 13, 
    color: 'white', 
    margin: 4,
    alignSelf: 'center'
  },
  commentContainer: {
    padding: 10
  },
  commentHeader: {
    flexDirection: 'row',
    justifyContent: 'space-between'
  },
  commentBody: {
    padding: 10
  },
  commentInputContainer: {
    paddingHorizontal: 10,
    backgroundColor: 'white',
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
  },
  addComment: {
    width: '100%',
    borderTopWidth: 1,
    borderColor: 'grey',
    backgroundColor: 'white',
  },
})
 
export default Map;