import React, { FC, useCallback, KeyboardEventHandler, useEffect, useMemo, memo } from 'react';
import { Textarea } from '~/components/input/Textarea';
import * as styles from './styles.scss';
import { Filler } from '~/components/containers/Filler';
import { Button } from '~/components/input/Button';
import assocPath from 'ramda/es/assocPath';
import { InputHandler, IFileWithUUID, IFile } from '~/redux/types';
import { connect } from 'react-redux';
import * as NODE_ACTIONS from '~/redux/node/actions';
import { selectNode } from '~/redux/node/selectors';
import { LoaderCircle } from '~/components/input/LoaderCircle';
import { Group } from '~/components/containers/Group';
import { UPLOAD_SUBJECTS, UPLOAD_TARGETS, UPLOAD_TYPES } from '~/redux/uploads/constants';
import uuid from 'uuid4';
import * as UPLOAD_ACTIONS from '~/redux/uploads/actions';
import { selectUploads } from '~/redux/uploads/selectors';
import { IState } from '~/redux/store';
import { getFileType } from '~/utils/uploader';
import { ButtonGroup } from '~/components/input/ButtonGroup';
import { SortableImageGrid } from '~/components/editors/SortableImageGrid';
import { moveArrItem } from '~/utils/fn';
import { SortEnd } from 'react-sortable-hoc';
import { SortableAudioGrid } from '~/components/editors/SortableAudioGrid';
import { getRandomPhrase } from '~/constants/phrases';

const mapStateToProps = (state: IState) => ({
  node: selectNode(state),
  uploads: selectUploads(state),
});

const mapDispatchToProps = {
  nodePostComment: NODE_ACTIONS.nodePostComment,
  nodeCancelCommentEdit: NODE_ACTIONS.nodeCancelCommentEdit,
  nodeSetCommentData: NODE_ACTIONS.nodeSetCommentData,
  uploadUploadFiles: UPLOAD_ACTIONS.uploadUploadFiles,
};

type IProps = ReturnType<typeof mapStateToProps> &
  typeof mapDispatchToProps & {
    id: number;
    is_before?: boolean;
  };

const CommentFormUnconnected: FC<IProps> = memo(
  ({
    node: { comment_data, is_sending_comment },
    uploads: { statuses, files },
    id,
    is_before = false,
    nodePostComment,
    nodeSetCommentData,
    uploadUploadFiles,
    nodeCancelCommentEdit,
  }) => {
    const onInputChange = useCallback(
      event => {
        event.preventDefault();

        if (!event.target.files || !event.target.files.length) return;

        const items: IFileWithUUID[] = Array.from(event.target.files).map(
          (file: File): IFileWithUUID => ({
            file,
            temp_id: uuid(),
            subject: UPLOAD_SUBJECTS.COMMENT,
            target: UPLOAD_TARGETS.COMMENTS,
            type: getFileType(file),
          })
        );

        const temps = items.map(file => file.temp_id);

        nodeSetCommentData(
          id,
          assocPath(['temp_ids'], [...comment_data[id].temp_ids, ...temps], comment_data[id])
        );
        uploadUploadFiles(items);
      },
      [uploadUploadFiles, comment_data, id, nodeSetCommentData]
    );

    const onInput = useCallback<InputHandler>(
      text => {
        nodeSetCommentData(id, assocPath(['text'], text, comment_data[id]));
      },
      [nodeSetCommentData, comment_data, id]
    );

    useEffect(() => {
      const temp_ids = (comment_data && comment_data[id] && comment_data[id].temp_ids) || [];
      const added_files = temp_ids
        .map(temp_uuid => statuses[temp_uuid] && statuses[temp_uuid].uuid)
        .map(el => !!el && files[el])
        .filter(el => !!el && !comment_data[id].files.some(file => file && file.id === el.id));

      const filtered_temps = temp_ids.filter(
        temp_id =>
          statuses[temp_id] &&
          (!statuses[temp_id].uuid || !added_files.some(file => file.id === statuses[temp_id].uuid))
      );

      if (added_files.length) {
        nodeSetCommentData(id, {
          ...comment_data[id],
          temp_ids: filtered_temps,
          files: [...comment_data[id].files, ...added_files],
        });
      }
    }, [statuses, files]);

    const comment = comment_data[id];

    const is_uploading_files = useMemo(() => comment.temp_ids.length > 0, [comment.temp_ids]);

    const onSubmit = useCallback(
      event => {
        if (event) event.preventDefault();
        if (is_uploading_files || is_sending_comment) return;

        nodePostComment(id, is_before);
      },
      [nodePostComment, id, is_before, is_uploading_files, is_sending_comment]
    );

    const onKeyDown = useCallback<KeyboardEventHandler<HTMLTextAreaElement>>(
      ({ ctrlKey, key }) => {
        if (!!ctrlKey && key === 'Enter') onSubmit(null);
      },
      [onSubmit]
    );

    const images = useMemo(
      () => comment.files.filter(file => file && file.type === UPLOAD_TYPES.IMAGE),
      [comment.files]
    );

    const locked_images = useMemo(
      () =>
        comment.temp_ids
          .filter(temp => statuses[temp] && statuses[temp].type === UPLOAD_TYPES.IMAGE)
          .map(temp_id => statuses[temp_id]),
      [statuses, comment.temp_ids]
    );

    const audios = useMemo(
      () => comment.files.filter(file => file && file.type === UPLOAD_TYPES.AUDIO),
      [comment.files]
    );

    const locked_audios = useMemo(
      () =>
        comment.temp_ids
          .filter(temp => statuses[temp] && statuses[temp].type === UPLOAD_TYPES.AUDIO)
          .map(temp_id => statuses[temp_id]),
      [statuses, comment.temp_ids]
    );

    const onFileDrop = useCallback(
      (fileId: IFile['id']) => {
        nodeSetCommentData(
          id,
          assocPath(
            ['files'],
            comment.files.filter(file => file.id != fileId),
            comment_data[id]
          )
        );
      },
      [comment_data, id, nodeSetCommentData]
    );

    const onTitleChange = useCallback(
      (fileId: IFile['id'], title: IFile['metadata']['title']) => {
        nodeSetCommentData(
          id,
          assocPath(
            ['files'],
            comment.files.map(file =>
              file.id === fileId ? { ...file, metadata: { ...file.metadata, title } } : file
            ),
            comment_data[id]
          )
        );
      },
      [comment_data, id, nodeSetCommentData]
    );

    const onImageMove = useCallback(
      ({ oldIndex, newIndex }: SortEnd) => {
        nodeSetCommentData(
          id,
          assocPath(
            ['files'],
            [
              ...audios,
              ...(moveArrItem(
                oldIndex,
                newIndex,
                images.filter(file => !!file)
              ) as IFile[]),
            ],
            comment_data[id]
          )
        );
      },
      [images, audios, comment_data, nodeSetCommentData]
    );

    const onAudioMove = useCallback(
      ({ oldIndex, newIndex }: SortEnd) => {
        nodeSetCommentData(
          id,
          assocPath(
            ['files'],
            [
              ...images,
              ...(moveArrItem(
                oldIndex,
                newIndex,
                audios.filter(file => !!file)
              ) as IFile[]),
            ],
            comment_data[id]
          )
        );
      },
      [images, audios, comment_data, nodeSetCommentData]
    );

    const onCancelEdit = useCallback(() => {
      nodeCancelCommentEdit(id);
    }, [nodeCancelCommentEdit, comment.id]);

    const placeholder = getRandomPhrase('SIMPLE');

    return (
      <form onSubmit={onSubmit} className={styles.wrap}>
        <div className={styles.input}>
          <Textarea
            value={comment.text}
            handler={onInput}
            onKeyDown={onKeyDown}
            disabled={is_sending_comment}
            placeholder={placeholder}
            minRows={2}
          />
        </div>

        {(!!images.length || !!audios.length) && (
          <div className={styles.attaches}>
            {!!images.length && (
              <SortableImageGrid
                onDrop={onFileDrop}
                onSortEnd={onImageMove}
                axis="xy"
                items={images}
                locked={locked_images}
                pressDelay={50}
                helperClass={styles.helper}
                size={120}
              />
            )}

            {(!!audios.length || !!locked_audios.length) && (
              <SortableAudioGrid
                items={audios}
                onDrop={onFileDrop}
                onTitleChange={onTitleChange}
                onSortEnd={onAudioMove}
                axis="y"
                locked={locked_audios}
                pressDelay={50}
                helperClass={styles.helper}
              />
            )}
          </div>
        )}

        <Group horizontal className={styles.buttons}>
          <ButtonGroup>
            <Button iconLeft="photo" size="small" color="gray" iconOnly>
              <input type="file" onInput={onInputChange} multiple accept="image/*" />
            </Button>

            <Button iconRight="audio" size="small" color="gray" iconOnly>
              <input type="file" onInput={onInputChange} multiple accept="audio/*" />
            </Button>
          </ButtonGroup>

          <Filler />

          {(is_sending_comment || is_uploading_files) && <LoaderCircle size={20} />}

          {id !== 0 && (
            <Button size="small" color="link" type="button" onClick={onCancelEdit}>
              Отмена
            </Button>
          )}

          <Button
            size="small"
            color="gray"
            iconRight={id === 0 ? 'enter' : 'check'}
            disabled={is_sending_comment || is_uploading_files}
          >
            {id === 0 ? 'Сказать' : 'Сохранить'}
          </Button>
        </Group>
      </form>
    );
  }
);

const CommentForm = connect(mapStateToProps, mapDispatchToProps)(CommentFormUnconnected);

export { CommentForm, CommentFormUnconnected };