import {useNavigation} from '@react-navigation/native';
import React, {useEffect, useState} from 'react';
import {Alert, Image, StyleSheet, Text, View} from 'react-native';
import {TouchableWithoutFeedback} from 'react-native-gesture-handler';
import LinearGradient from 'react-native-linear-gradient';
import {useDispatch, useStore} from 'react-redux';
import {BACKGROUND_GRADIENT_MAP} from '../../constants';
import {ERROR_DELETED_OBJECT} from '../../constants/strings';
import {
  loadImageFromURL,
  loadMoments,
  loadMomentThumbnail,
} from '../../services';
import {
  acceptFriendRequest,
  declineFriendRequest,
  loadUserNotifications,
  updateReplyPosted,
  updateUserXFriends,
} from '../../store/actions';
import {RootState} from '../../store/rootReducer';
import {MomentType, NotificationType, ScreenType} from '../../types';
import {
  fetchUserX,
  getTokenOrLogout,
  SCREEN_HEIGHT,
  userXInStore,
} from '../../utils';
import AcceptDeclineButtons from '../common/AcceptDeclineButtons';

interface NotificationProps {
  item: NotificationType;
  screenType: ScreenType;
  moments: MomentType[];
}

const Notification: React.FC<NotificationProps> = (props) => {
  const {
    item: {
      actor: {id, username, first_name, last_name, thumbnail_url},
      verbage,
      notification_type,
      notification_object,
      unread,
    },
    screenType,
    moments: loggedInUserMoments,
  } = props;

  const navigation = useNavigation();
  const state: RootState = useStore().getState();
  const dispatch = useDispatch();

  const [avatar, setAvatar] = useState<string | undefined>(undefined);
  const [momentURI, setMomentURI] = useState<string | undefined>(undefined);
  const [onTapLoadProfile, setOnTapLoadProfile] = useState<boolean>(false);

  useEffect(() => {
    (async () => {
      const response = await loadImageFromURL(thumbnail_url);
      if (response) {
        setAvatar(response);
      } else {
        setAvatar('');
      }
    })();
  }, []);

  useEffect(() => {
    if (onTapLoadProfile) {
      fetchUserX(dispatch, {userId: id, username: username}, screenType);
    }
    return () => {
      setOnTapLoadProfile(false);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [onTapLoadProfile]);

  useEffect(() => {
    let mounted = true;
    const loadMomentImage = async (moment_id: string) => {
      const response = await loadMomentThumbnail(moment_id);
      if (mounted && response) {
        setMomentURI(response);
      } else {
        // if not set to empty, it will re-use the previous notification's state
        setMomentURI('');
      }
    };
    if (
      (notification_type === 'CMT' ||
        notification_type === 'MOM_3+' ||
        notification_type === 'MOM_FRIEND') &&
      notification_object
    ) {
      loadMomentImage(
        notification_object.moment_id
          ? notification_object.moment_id
          : notification_object.parent_comment.moment_id,
      );
      return () => {
        mounted = false;
      };
    }
  }, [id, notification_object, notification_type]);

  const onNotificationTap = async () => {
    switch (notification_type) {
      case 'FRD_ACPT':
      case 'FRD_REQ':
        if (!userXInStore(state, screenType, id)) {
          await fetchUserX(
            dispatch,
            {userId: id, username: username},
            screenType,
          );
        }
        navigation.push('Profile', {
          userXId: id,
          screenType,
        });
        break;
      case 'CMT':
        //Notification object is set to null if the comment / comment_thread / moment gets deleted
        if (!notification_object) {
          Alert.alert(ERROR_DELETED_OBJECT);
          break;
        }
        let {moment_id} = notification_object;
        let {comment_id} = notification_object;

        //If this is a thread, get comment_id and moment_id from parent_comment
        if (!notification_object?.moment_id) {
          moment_id = notification_object?.parent_comment?.moment_id;
          comment_id = notification_object?.parent_comment?.comment_id;
        }

        // Now find the moment we need to display
        let moment: MomentType | undefined = loggedInUserMoments?.find(
          (m) => m.moment_id === moment_id,
        );
        let userXId;

        // If moment does not belong to the logged in user, then the comment was probably a reply to logged in user's comment
        // on userX's moment
        // Load moments for userX
        if (!moment) {
          let moments: MomentType[] = [];
          try {
            //Populate local state in the mean time
            setOnTapLoadProfile(true);
            const token = await getTokenOrLogout(dispatch);
            moments = await loadMoments(id, token);
          } catch (err) {
            console.log(err);
          }
          moment = moments?.find((m) => m.moment_id === moment_id);
          userXId = id;
        }

        //Now if moment was found, navigate to the respective moment
        if (moment) {
          if (notification_object?.parent_comment) {
            dispatch(updateReplyPosted(notification_object));
          }
          navigation.push('IndividualMoment', {
            moment,
            userXId: userXId, // we're only viewing our own moment here
            screenType,
          });
          setTimeout(() => {
            navigation.push('MomentCommentsScreen', {
              moment_id: moment_id,
              screenType,
              comment_id: comment_id,
            });
          }, 500);
        }
        break;
      case 'MOM_3+':
      case 'MOM_FRIEND':
        const object = notification_object as MomentType;
        await fetchUserX(
          dispatch,
          {userId: id, username: username},
          screenType,
        );
        navigation.push('IndividualMoment', {
          moment: object,
          userXId: id,
          screenType,
        });
        break;
      default:
        break;
    }
  };

  const handleAcceptRequest = async () => {
    await dispatch(
      acceptFriendRequest({id, username, first_name, last_name, thumbnail_url}),
    );
    await dispatch(updateUserXFriends(id, state));
    dispatch(loadUserNotifications());
  };

  const handleDeclineFriendRequest = async () => {
    await dispatch(declineFriendRequest(id));
    dispatch(loadUserNotifications());
  };

  const renderContent = () => (
    <TouchableWithoutFeedback
      style={styles.container}
      onPress={onNotificationTap}>
      <View style={styles.avatarContainer}>
        <Image
          style={styles.avatar}
          source={
            avatar
              ? {uri: avatar}
              : require('../../assets/images/avatar-placeholder.png')
          }
        />
      </View>
      <View style={styles.contentContainer}>
        <Text style={styles.actorName}>
          {first_name} {last_name}
        </Text>
        <Text>{verbage}</Text>
      </View>
      {notification_type === 'FRD_REQ' && (
        <View style={styles.buttonsContainer}>
          <AcceptDeclineButtons
            requester={{id, username, first_name, last_name}}
            onAccept={handleAcceptRequest}
            onReject={handleDeclineFriendRequest}
          />
        </View>
      )}
      {(notification_type === 'CMT' ||
        notification_type === 'MOM_3+' ||
        notification_type === 'MOM_FRIEND') &&
        notification_object && (
          <Image style={styles.moment} source={{uri: momentURI}} />
        )}
    </TouchableWithoutFeedback>
  );

  return unread ? (
    <LinearGradient colors={BACKGROUND_GRADIENT_MAP[2]} useAngle angle={90}>
      {renderContent()}
    </LinearGradient>
  ) : (
    renderContent()
  );
};

const styles = StyleSheet.create({
  container: {
    flexDirection: 'row',
    height: SCREEN_HEIGHT / 10,
    flex: 1,
    alignItems: 'center',
  },
  avatarContainer: {
    marginLeft: '8%',
    flex: 1,
    justifyContent: 'center',
  },
  avatar: {
    height: 42,
    width: 42,
    borderRadius: 20,
  },
  contentContainer: {
    flex: 5,
    marginLeft: '5%',
    height: '80%',
    flexDirection: 'column',
    justifyContent: 'space-around',
    marginRight: '15%',
  },
  actorName: {
    fontSize: 15,
    fontWeight: '700',
  },
  moment: {
    position: 'absolute',
    height: 42,
    width: 42,
    right: '5%',
  },
  buttonsContainer: {},
});

export default Notification;