import React, {useContext, useEffect, useRef, useState} from 'react';
import {
  Keyboard,
  KeyboardAvoidingView,
  Platform,
  StyleSheet,
  TextInput,
  View,
} from 'react-native';
import {MentionInput} from 'react-native-controlled-mentions';
import {TouchableOpacity} from 'react-native-gesture-handler';
import {useDispatch, useSelector} from 'react-redux';
import UpArrowIcon from '../../assets/icons/up_arrow.svg';
import {TAGG_LIGHT_BLUE} from '../../constants';
import {CommentContext} from '../../screens/profile/MomentCommentsScreen';
import {postComment} from '../../services';
import {updateReplyPosted} from '../../store/actions';
import {RootState} from '../../store/rootreducer';
import {CommentThreadType, CommentType} from '../../types';
import {SCREEN_HEIGHT, SCREEN_WIDTH} from '../../utils';
import {mentionPartTypes} from '../../utils/comments';
import {Avatar} from '../common';

export interface AddCommentProps {
  momentId: string;
  placeholderText: string;
}

const AddComment: React.FC<AddCommentProps> = ({momentId, placeholderText}) => {
  const {setShouldUpdateAllComments, commentTapped} = useContext(
    CommentContext,
  );
  const [inReplyToMention, setInReplyToMention] = useState('');
  const [comment, setComment] = useState('');
  const [keyboardVisible, setKeyboardVisible] = useState(false);
  const {avatar} = useSelector((state: RootState) => state.user);
  const dispatch = useDispatch();
  const ref = useRef<TextInput>(null);
  const isReplyingToComment =
    commentTapped !== undefined && !('parent_comment' in commentTapped);
  const isReplyingToReply =
    commentTapped !== undefined && 'parent_comment' in commentTapped;
  const objectId: string = commentTapped
    ? 'parent_comment' in commentTapped
      ? (commentTapped as CommentThreadType).parent_comment.comment_id
      : (commentTapped as CommentType).comment_id
    : momentId;

  const addComment = async () => {
    const trimmed = comment.trim();
    if (trimmed === '') {
      return;
    }
    const postedComment = await postComment(
      inReplyToMention + trimmed,
      objectId,
      isReplyingToComment || isReplyingToReply,
    );

    if (postedComment) {
      setComment('');
      setInReplyToMention('');

      //Set new reply posted object
      //This helps us show the latest reply on top
      //Data set is kind of stale but it works
      if (isReplyingToComment || isReplyingToReply) {
        dispatch(
          updateReplyPosted({
            comment_id: postedComment.comment_id,
            parent_comment: {comment_id: objectId},
          }),
        );
      }
      setShouldUpdateAllComments(true);
    }
  };

  useEffect(() => {
    const showKeyboard = () => setKeyboardVisible(true);
    Keyboard.addListener('keyboardWillShow', showKeyboard);
    return () => Keyboard.removeListener('keyboardWillShow', showKeyboard);
  }, []);

  useEffect(() => {
    const hideKeyboard = () => setKeyboardVisible(false);
    Keyboard.addListener('keyboardWillHide', hideKeyboard);
    return () => Keyboard.removeListener('keyboardWillHide', hideKeyboard);
  }, []);

  useEffect(() => {
    if (isReplyingToComment || isReplyingToReply) {
      // bring up keyboard
      ref.current?.focus();
    }
    if (commentTapped && isReplyingToReply) {
      const commenter = (commentTapped as CommentThreadType).commenter;
      setInReplyToMention(`@[${commenter.username}](${commenter.id}) `);
    } else {
      setInReplyToMention('');
    }
  }, [isReplyingToComment, isReplyingToReply, commentTapped]);

  return (
    <KeyboardAvoidingView
      behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
      keyboardVerticalOffset={SCREEN_HEIGHT * 0.1}>
      <View
        style={[
          styles.container,
          keyboardVisible ? styles.whiteBackround : {},
        ]}>
        <View style={styles.textContainer}>
          <Avatar style={styles.avatar} uri={avatar} />
          <MentionInput
            containerStyle={styles.text}
            placeholder={placeholderText}
            value={inReplyToMention + comment}
            onChange={(newText: string) => {
              // skipping the `inReplyToMention` text
              setComment(
                newText.substring(inReplyToMention.length, newText.length),
              );
            }}
            inputRef={ref}
            partTypes={mentionPartTypes}
          />
          <View style={styles.submitButton}>
            <TouchableOpacity style={styles.submitButton} onPress={addComment}>
              <UpArrowIcon width={35} height={35} color={'white'} />
            </TouchableOpacity>
          </View>
        </View>
      </View>
    </KeyboardAvoidingView>
  );
};

const styles = StyleSheet.create({
  container: {
    backgroundColor: '#f7f7f7',
    alignItems: 'center',
    width: SCREEN_WIDTH,
  },
  textContainer: {
    width: '95%',
    flexDirection: 'row',
    backgroundColor: '#e8e8e8',
    alignItems: 'center',
    justifyContent: 'space-between',
    margin: '3%',
    borderRadius: 25,
  },
  text: {
    flex: 1,
    padding: '1%',
    marginHorizontal: '1%',
    maxHeight: 100,
  },
  avatar: {
    height: 35,
    width: 35,
    borderRadius: 30,
    marginRight: 10,
    marginLeft: '3%',
    marginVertical: '2%',
    alignSelf: 'flex-end',
  },
  submitButton: {
    height: 35,
    width: 35,
    backgroundColor: TAGG_LIGHT_BLUE,
    borderRadius: 999,
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: '3%',
    marginVertical: '2%',
    alignSelf: 'flex-end',
  },
  whiteBackround: {
    backgroundColor: '#fff',
  },
});

export default AddComment;