import React, { useEffect, useRef, useState } from 'react';
import {Image, StyleSheet, View, TouchableOpacity, ScrollView, Text, Alert} from 'react-native';
import MapboxGL from '@react-native-mapbox-gl/maps';
import 'react-native-get-random-values'
import { seedLandmarkData, useMockState } from '../contexts/MockContext';
import Modal from 'react-native-modalbox';
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, booleanPointInPolygon } from '@turf/turf';
import ModalDropdown from 'react-native-modal-dropdown';

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

RNLocation.configure({
  distanceFilter: 1
});

const places = {
  type: 'FeatureCollection',
  features: [
    {
      type: 'Feature',
      id: 'test1',
      properties: {
        name: 'University of Alberta'
      },
      geometry: {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -113.53271484375,
              53.517705925148846
            ],
            [
              -113.52018356323242,
              53.515511461129655
            ],
            [
              -113.52044105529785,
              53.52311504872178
            ],
            [
              -113.51529121398926,
              53.522757863745845
            ],
            [
              -113.5151195526123,
              53.52576832854355
            ],
            [
              -113.53134155273438,
              53.53143150445749
            ],
            [
              -113.53271484375,
              53.517705925148846
            ]
          ]
        ]
      }
    }
  ]
}

const Map = ({navigation, route}) => {
  const { dispatch, state } = useMockState();
  //const [center, setCenter] = useState([-113.4982408198804, 53.56484760459073]);
  const [center, setCenter] = useState([]);
  const [tempPoint, setTempPoint] = useState(null);
  const [selectedPlaces, setPlaces] = useState([]);
  const [voiceActive, setVoice] = useState(false);
  const landmarkAddModal = useRef();
  const mapMenuModal = useRef();
  const landmarkDetailsModal = useRef();
  const voiceModal = useRef();
  const map = useRef();

  useEffect(() => {
    // const unsubscribePermission = RNLocation.subscribeToPermissionUpdates(currentPermission => {
    //   dispatch({ type:"UPDATE_LOCATION_PERMISSION", payload: currentPermission });
    // });

    // const unsubscribeLocation = RNLocation.subscribeToLocationUpdates(locations => {
    //   dispatch({ type:"UPDATE_LOCATION", payload: locations });
    // });

    async function handleLocation() {
      if (state.landmarks == null) {
        const landmarks = seedLandmarkData();
        dispatch({ type:"UPDATE_LANDMARKS", payload: landmarks });
      }

      if (state.location == null && !state.locationPermission) {
        dispatch({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();

    return() => {
      // unsubscribePermission();
      // unsubscribeLocation();
    }
  },[state]);

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

  const showLandmarkDetails = (landmark) => {
    changeSelectedLandmark(landmark);
    landmarkDetailsModal.current.open();
  }

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

  const handleMapTouch = (e) => {
    setTempPoint(e.geometry.coordinates);
    changeSelectedLandmark({
      longitude: e.geometry.coordinates[0], 
      latitude: e.geometry.coordinates[1], 
      icon: 'barrier', 
      title: '', 
      desc: ''
    })
    landmarkAddModal.current.open();
  }

  const handlePlaceTouch = (e) => {
    setTempPoint([e.coordinates.longitude, e.coordinates.latitude]);
    const touchedPlaces = e.features.filter(f => {
      return booleanPointInPolygon(point([e.coordinates.longitude, e.coordinates.latitude]), polygon(f.geometry.coordinates));
    });

    if (touchedPlaces.length == 0) {
      changeSelectedLandmark({
        longitude: e.coordinates.longitude, 
        latitude: e.coordinates.latitude, 
        icon: 'barrier', 
        title: '', 
        desc: ''
      });
      landmarkAddModal.current.open();
    }
    else {
      setPlaces(touchedPlaces);
      mapMenuModal.current.open();
    }
  }

  const addLandmark = () => {
    landmarkAddModal.current.close();
    navigation.navigate("LandmarkForm");
  }

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

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

  const closeModal = (message) => {
    landmarkDetailsModal.current.close();
    if (message != null) {
      Alert.alert(message); 
    }
  };

  const clearModals = () => {
    landmarkDetailsModal.current.close();
    voiceModal.current.close();
    landmarkAddModal.current.close();
  };

  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} 
          onPress={e => handleMapTouch(e)}
          // onLongPress={p => promptAddPlace(p.geometry.coordinates)}
          >
          <MapboxGL.UserLocation/>
          <MapboxGL.Camera followUserLocation followUserMode={'normal'} zoomLevel={9} centerCoordinate={center} />
          {tempPoint && 
            <MapboxGL.PointAnnotation id="temp" coordinate={tempPoint} />
          }
          {state.landmarks.map(landmark => {
          return (
          <MapboxGL.MarkerView key={landmark.id} id={landmark.id} coordinate={[landmark.longitude, landmark.latitude]} >
            <View style={{width: 25, height: 20}}>
              <TouchableOpacity onPress={() => showLandmarkDetails(landmark)} >
                <Image source={Icons[landmark.icon]} style={{width: 22, height: 30}} />
              </TouchableOpacity>
            </View>
          </MapboxGL.MarkerView>
          )})}
          <MapboxGL.ShapeSource onPress={e => handlePlaceTouch(e)} id="test" shape={places}>
              <MapboxGL.FillLayer id="test" style={{fillColor: 'black', fillOpacity: .3}}/>
          </MapboxGL.ShapeSource>
        </MapboxGL.MapView>
          <TouchableOpacity style={styles.micBtn} name="microphone" onPress={openVoiceModal}>
            <Icon name='microphone' size={20} color='white' />
          </TouchableOpacity>
      </View>
      {state.locationPermission ? <VoiceView ref={voiceModal} changeSelectedLandmark={changeSelectedLandmark} editLandmark={editLandmark} style={styles.voiceModal} onPress={openVoiceModal}/> : null}
      <Modal position={"bottom"} ref={landmarkDetailsModal} style={{height: 520}} backButtonClose={true} >
        <LandmarkDetails closeModal={closeModal} editLandmark={editLandmark}/>
      </Modal>
      <Modal position={"bottom"} ref={mapMenuModal} style={styles.menuModal} backButtonClose={true}>
        <Text style={styles.addTitle}>What would you like to do?</Text>
        <View style={{justifyContent: 'space-between', alignItems: 'flex-end',}}>
          <TouchableOpacity style={{marginRight: 30, marginTop: 20}} onPress={addLandmark}>
            <Text style={{color: 'white'}}>Add landmark</Text>
          </TouchableOpacity>
          <ModalDropdown style={{marginRight: 30, marginTop: 20}} defaultValue={selectedPlaces.map(p => p.properties.name)[0]} defaultIndex={0} options={selectedPlaces.map(p => p.properties.name)}/>
          <TouchableOpacity style={{marginRight: 30, marginTop: 20}} onPress={() => landmarkAddModal.current.close()}>
            <Text style={{color: 'white'}}>Cancel</Text>
          </TouchableOpacity>
        </View>
      </Modal>
      <Modal style={styles.addModal} position={"bottom"} ref={landmarkAddModal} onClosed={removeTempPoint} backButtonClose={true}>
        <Text style={styles.addTitle}>Add landmark here?</Text>
        <View style={{flexDirection: 'row', justifyContent: 'flex-end', alignItems: 'center', }}>
          <TouchableOpacity style={{marginRight: 40, height: 50}} onPress={() => landmarkAddModal.current.close()}>
            <Text style={{color: 'white'}}>Cancel</Text>
          </TouchableOpacity>
          <TouchableOpacity style={{marginRight: 40, height: 50}} onPress={addLandmark}>
            <Text style={{color: 'white'}}>Add</Text>
          </TouchableOpacity>
        </View>
      </Modal>
    </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,
  },
  micBtn: {
    position: 'absolute',
    backgroundColor: '#df3f3f',
    justifyContent: 'center',
    alignItems: 'center',
    borderRadius: 40,
    bottom: 70,
    right: 20,
    zIndex: 5,
    width: 60,
    height: 60,
  },
  menuModal: {
    backgroundColor: '#df3f3f',
    height: 200,
  },
  addModal: {
    backgroundColor: '#df3f3f',
    height: 100,
  },
  voiceModal: {
    backgroundColor: '#df3f3f',
    height: 200,

  },  
  addTitle: {
    color: 'white',
    fontSize: 20,
    marginTop: 20,
    marginLeft: 20
  }
})
 
export default Map;