import React, {Component, PureComponent} from 'react';
import {
  StyleSheet, Text, View, TouchableOpacity,
  Image, Dimensions, Modal
} from 'react-native';

import {RtcEngine, AgoraView} from 'react-native-agora';
import {
  APPID,
} from '../utils';

const BtnEndCall = () => require('../assets/btn_endcall.png');
const BtnMute = () => require('../assets/btn_mute.png');
const BtnSpeaker = () => require('../assets/btn_speaker.png');
const BtnSwitchCamera = () => require('../assets/btn_switch_camera.png');
const BtnVideo = () => require('../assets/btn_video.png');
const EnableCamera = () => require('../assets/enable_camera.png');
const DisableCamera = () => require('../assets/disable_camera.png');
const EnablePhotoflash = () => require('../assets/enable_photoflash.png');
const DisablePhotoflash = () => require('../assets/disable_photoflash.png');
const IconMuted = () => require('../assets/icon_muted.png');
const IconSpeaker = () =>require('../assets/icon_speaker.png');

const {width} = Dimensions.get('window');

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#F4F4F4'
  },
  absView: {
    position: 'absolute',
    top: 20,
    left: 0,
    right: 0,
    bottom: 0,
    justifyContent: 'space-between',
  },
  videoView: {
    padding: 5,
    flexWrap: 'wrap',
    flexDirection: 'row',
    zIndex: 100
  },
  localView: {
    flex: 1
  },
  remoteView: {
    width: (width - 40) / 3,
    height: (width - 40) / 3,
    margin: 5
  },
  bottomView: {
    padding: 20,
    flexDirection: 'row',
    justifyContent: 'space-around'
  }
});

class OperateButton extends PureComponent {
  render() {
    const {onPress, source, style, imgStyle = {width: 50, height: 50}} = this.props;
    return (
      <TouchableOpacity
        style={style}
        onPress={onPress}
        activeOpacity={.7}
      >
        <Image
          style={imgStyle}
          source={source}
        />
      </TouchableOpacity>
    )
  }
}

type Props = {
  channelProfile: Number,
  videoProfile: Number,
  clientRole: Number,
  swapWidthAndHeight: Boolean,
  onCancel: Function
}

export default class Agora extends Component<Props> {
  state = {
    peerIds: [],
    joinSucceed: false,
    isSpeak: true,
    isMute: false,
    isCameraTorch: false,
    disableVideo: false,
    hideButton: false,
    visible: false,
    selectedUid: undefined,
  };

  componentWillMount () {
    const config = {
      appid: APPID,
      channelProfile: this.props.channelProfile,
      videoProfile: this.props.videoProfile,
      clientRole: this.props.clientRole,
      swapWidthAndHeight: this.props.swapWidthAndHeight
    }
    console.log("[CONFIG]", config);
    RtcEngine.init(config);
  }

  componentDidMount () {
    RtcEngine.getSdkVersion((version) => {
      console.log('[RtcEngine] getSdkVersion', version);
    })

    RtcEngine.joinChannel();
    RtcEngine.enableAudioVolumeIndication(500, 3);
    RtcEngine.eventEmitter({
      onFirstRemoteVideoDecoded: (data) => {
        console.log('[RtcEngine] onFirstRemoteVideoDecoded', data);
        const {peerIds} = this.state;
        if (peerIds.indexOf(data.uid) !== -1) {
          this.setState({
            peerIds: [...peerIds, data.uid]
          })
        }
      },
      onUserOffline: (data) => {
        console.log('[RtcEngine] onUserOffline', data);
        this.setState({
            peerIds: this.state.peerIds.filter(uid => uid !== data.uid)
        })
      },
      onJoinChannelSuccess: (data) => {
        console.log('[RtcEngine] onJoinChannelSuccess', data);
        // RtcEngine.setShowLocalVideo()
        RtcEngine.startPreview();
        this.setState({
          joinSucceed: true
        })
      },
      onAudioVolumeIndication: (data) => {
        console.log('[RtcEngine] onAudioVolumeIndication', data);
      },
      onUserJoined: (data) => {
        console.log('[RtcEngine] onUserJoined', data);
      },
      onError: (data) => {
        console.log('[RtcEngine] onError', data);
        if (data.error === 17) {
          RtcEngine.leaveChannel();
          RtcEngine.destroy();
        }
        this.props.onCancel(data.error);
      }
    })
  }

componentWillUnmount () {
  RtcEngine.removeEmitter()
}

handleCancel = () => {
  RtcEngine.leaveChannel();
  RtcEngine.destroy();
  this.props.onCancel();
}

switchCamera = () => {
  RtcEngine.switchCamera();
}

toggleAllRemoteAudioStreams = () => {
  this.setState({
    isMute: !this.state.isMute
  }, () => {
    RtcEngine.muteAllRemoteAudioStreams(this.state.isMute);
  })
}

toggleSpeakerPhone = () => {
  this.setState({
    isSpeak: !this.state.isSpeak
  }, () => {
    RtcEngine.setDefaultAudioRouteToSpeakerphone(this.state.isSpeak);
  })
}

toggleCameraTorch = () => {
  this.setState({
    isCameraTorch: !this.state.isCameraTorch
  }, () => {
    RtcEngine.setCameraTorchOn(this.state.isCameraTorch)
  })
}

toggleVideo = () => {
  this.setState({
    disableVideo: !this.state.videodisableVideo
  }, () => {
    this.state.disableVideo ? RtcEngine.enableVideo() : RtcEngine.disableVideo()
  });
}

toggleHideButtons = () => {
  this.setState({
    hideButton: !this.state.hideButton
  })
}

onPressVideo = (uid) => {
  this.setState({
    selectedUid: uid
  }, () => {
    this.setState({
      visible: true
    })
  })
}

buttonsView = ({hideButton, isCameraTorch, disableVideo, isMute, isSpeaker}) => {
  if (!hideButton) {
  return (
    <View>
      <OperateButton
        style={{alignSelf: 'center', marginBottom: -10}}
        onPress={this.handleCancel}
        imgStyle={{width: 60, height: 60}}
        source={BtnEndCall()}
    />
    <View style={styles.bottomView}>
      <OperateButton
        onPress={this.toggleCameraTorch}
        imgStyle={{width: 40, height: 40}}
        source={isCameraTorch ? EnablePhotoflash() : DisablePhotoflash()}
      />
      <OperateButton
        onPress={this.toggleVideo}
        source={disableVideo ? EnableCamera() : DisableCamera()}
      />
    </View>
    <View style={styles.bottomView}>
      <OperateButton
        onPress={this.toggleAllRemoteAudioStreams}
        source={isMute ? IconMuted() : BtnMute()}
      />
      <OperateButton
        onPress={this.switchCamera}
        source={BtnSwitchCamera()}
      />
      <OperateButton
        onPress={this.toggleSpeakerPhone}
        source={!isSpeaker ? IconSpeaker() : BtnSpeaker()}
      />
    </View>
    </View>)
  }
}

agoraPeerViews = ({visible, peerIds}) => {
  return (visible ? 
  <View style={styles.videoView} /> :
  <View style={styles.videoView}>{
    peerIds.map((uid, key) => (
    <TouchableOpacity
      activeOpacity={1}
      onPress={() => this.onPressVideo(uid)}
      key={key}>
    <AgoraView
        style={styles.remoteView}
        zOrderMediaOverlay={true}
        remoteUid={uid}
    />
    </TouchableOpacity>
    ))
    }</View>)
}

modalView = ({visible}) => {
  return (
  <Modal
    visible={visible}
    presentationStyle={'fullScreen'}
    animationType={'slide'}
    onRequestClose={() => {}}
    >
    <TouchableOpacity
      activeOpacity={1}
      style={{flex: 1}}
      onPress={() => this.setState({
        visible: false
    })} >
      <AgoraView
        style={{flex: 1}}
        zOrderMediaOverlay={true}
        remoteUid={this.state.selectedUid}
      />
    </TouchableOpacity>
  </Modal>)
}

render () {
  if (!this.state.joinSucceed) {
    return (
    <View style={{flex: 1, backgroundColor: '#fff', justifyContent: 'center', alignItems: 'center'}}>
      <Text>Creating a video conference...</Text>
    </View>
    )
  }

  return (
    <TouchableOpacity
      activeOpacity={1}
      onPress={this.toggleHideButtons}
      style={styles.container}
    >
      <AgoraView style={styles.localView} showLocalVideo={true} />
        <View style={styles.absView}>
          {this.agoraPeerViews(this.state)}
          {this.buttonsView(this.state)}
        </View>
      {this.modalView(this.state)}
    </TouchableOpacity>
    )
  } 
}