import React, {PropTypes} from 'react';
import {notifyForNewCommentStatus} from 'coral-plugin-commentbox/CommentBox';
import {CommentForm} from 'coral-plugin-commentbox/CommentForm';
import styles from './Comment.css';
import {CountdownSeconds} from './CountdownSeconds';
import {getEditableUntilDate} from './util';
import {can} from 'coral-framework/services/perms';
import {forEachError} from 'coral-framework/utils';

import {Icon} from 'coral-ui';
import t from 'coral-framework/services/i18n';

/**
 * Renders a Comment's body in such a way that the end-user can edit it and save changes
 */
export class EditableCommentContent extends React.Component {
  static propTypes = {

    // show notification to the user (e.g. for errors)
    addNotification: PropTypes.func.isRequired,
    asset: PropTypes.shape({
      settings: PropTypes.shape({
        charCountEnable: PropTypes.bool,
      }),
    }).isRequired,

    // comment that is being edited
    comment: PropTypes.shape({
      body: PropTypes.string,
      editing: PropTypes.shape({
        edited: PropTypes.bool,

        // ISO8601
        editableUntil: PropTypes.string,
      })
    }).isRequired,

    // logged in user
    currentUser: PropTypes.shape({
      id: PropTypes.string.isRequired
    }),
    maxCharCount: PropTypes.number,

    // edit a comment, passed {{ body }}
    editComment: React.PropTypes.func,

    // called when editing should be stopped
    stopEditing: React.PropTypes.func,
  }

  constructor(props) {
    super(props);
    this.editWindowExpiryTimeout = null;
    this.state = {
      body: props.comment.body,
      loadingState: '',
    };
  }
  componentDidMount() {
    const editableUntil = getEditableUntilDate(this.props.comment);
    const now = new Date();
    const editWindowRemainingMs = editableUntil && (editableUntil - now);
    if (editWindowRemainingMs > 0) {
      this.editWindowExpiryTimeout = setTimeout(() => {
        this.forceUpdate();
      }, editWindowRemainingMs);
    }
  }
  componentWillUnmount() {
    if (this.editWindowExpiryTimeout) {
      this.editWindowExpiryTimeout = clearTimeout(this.editWindowExpiryTimeout);
    }
  }

  handleBodyChange = (body) => {
    this.setState({body});
  }

  handleSubmit = async () => {
    if (!can(this.props.currentUser, 'INTERACT_WITH_COMMUNITY')) {
      this.props.addNotification('error', t('error.NOT_AUTHORIZED'));
      return;
    }

    this.setState({loadingState: 'loading'});

    const {editComment, addNotification, stopEditing} = this.props;
    if (typeof editComment !== 'function') {return;}
    let response;
    try {
      response = await editComment({body: this.state.body});
      this.setState({loadingState: 'success'});
      const status = response.data.editComment.comment.status;
      notifyForNewCommentStatus(this.props.addNotification, status);
      if (typeof stopEditing === 'function') {
        stopEditing();
      }
    } catch (error) {
      this.setState({loadingState: 'error'});
      forEachError(error, ({msg}) => addNotification('error', msg));
    }
  }

  getEditableUntil = (props = this.props) => {
    return getEditableUntilDate(props.comment);
  }

  isEditWindowExpired = (props = this.props) => {
    return (this.getEditableUntil(props) - new Date()) < 0;
  }

  isSubmitEnabled = (comment) => {

    // should be disabled if user hasn't actually changed their
    // original comment
    return (comment.body !== this.props.comment.body) && !this.isEditWindowExpired();
  }

  render() {
    return (
      <div className={styles.editCommentForm}>
        <CommentForm
          defaultValue={this.props.comment.body}
          charCountEnable={this.props.asset.settings.charCountEnable}
          maxCharCount={this.props.maxCharCount}
          submitEnabled={this.isSubmitEnabled}
          body={this.state.body}
          onBodyChange={this.handleBodyChange}
          onSubmit={this.handleSubmit}
          bodyLabel={t('edit_comment.body_input_label')}
          bodyPlaceholder=""
          submitText={<span>{t('edit_comment.save_button')}</span>}
          submitButtonCStyle="green"
          onCancel={this.props.stopEditing}
          submitButtonClassName={styles.button}
          cancelButtonClassName={styles.button}
          loadingState={this.state.loadingState}
          buttonContainerStart={
            <div className={styles.buttonContainerLeft}>
              <span className={styles.editWindowRemaining}>
                {
                  this.isEditWindowExpired()
                  ? <span>
                      {t('edit_comment.edit_window_expired')}
                      {
                        typeof this.props.stopEditing === 'function'
                        ? <span>&nbsp;<a className={styles.link} onClick={this.props.stopEditing}>{t('edit_comment.edit_window_expired_close')}</a></span>
                        : null
                      }
                    </span>
                  : <span>
                      <Icon name="timer"/> {t('edit_comment.edit_window_timer_prefix')}
                      <CountdownSeconds
                        until={this.getEditableUntil()}
                        classNameForMsRemaining={(remainingMs) => (remainingMs <= 10 * 1000) ? styles.editWindowAlmostOver : '' }
                      />
                    </span>
                }
              </span>
            </div>
          }
        />
      </div>
    );
  }
}