import React, { Component } from 'react';
import { observer } from 'mobx-react';
import { browserHistory, withRouter } from 'react-router';
import keydown from 'react-keydown';

import DocumentEditStore, {
  DOCUMENT_EDIT_SETTINGS,
} from './DocumentEditStore';

import Switch from 'components/Switch';
import Layout, { Title, HeaderAction, SaveAction } from 'components/Layout';
import { Flex } from 'reflexbox';
import AtlasPreviewLoading from 'components/AtlasPreviewLoading';
import CenteredContent from 'components/CenteredContent';
import DropdownMenu, { MenuItem, MoreIcon } from 'components/DropdownMenu';

import EditorLoader from './components/EditorLoader';

const DISREGARD_CHANGES = `You have unsaved changes.
Are you sure you want to disgard them?`;

@keydown([
  'cmd+enter', 'ctrl+enter',
  'cmd+esc', 'ctrl+esc',
  'cmd+shift+p', 'ctrl+shift+p'])
@withRouter
@observer
class DocumentEdit extends Component {
  static store;

  static propTypes = {
    route: React.PropTypes.object.isRequired,
    router: React.PropTypes.object.isRequired,
    params: React.PropTypes.object,
  }

  state = {
    scrollTop: 0,
  }

  constructor(props) {
    super(props);
    this.store = new DocumentEditStore(
      JSON.parse(localStorage[DOCUMENT_EDIT_SETTINGS] || '{}')
    );
  }

  componentDidMount = () => {
    if (this.props.route.newDocument) {
      this.store.collectionId = this.props.params.id;
      this.store.newDocument = true;
    } else if (this.props.route.newChildDocument) {
      this.store.documentId = this.props.params.id;
      this.store.newChildDocument = true;
      this.store.fetchDocument();
    } else {
      this.store.documentId = this.props.params.id;
      this.store.newDocument = false;
      this.store.fetchDocument();
    }

    // Load editor async
    EditorLoader()
    .then(({ Editor }) => {
      this.setState({ Editor });
    });

    // Set onLeave hook
    this.props.router.setRouteLeaveHook(this.props.route, () => {
      if (this.store.hasPendingChanges) {
        return confirm(DISREGARD_CHANGES);
      }
      return;
    });
  }

  componentWillReceiveProps = (nextProps) => {
    const key = nextProps.keydown.event;

    if (key) {
      // Cmd + Enter
      if(key.key === 'Enter' && (key.metaKey || key.ctrl.Key)) {
        this.onSave();
      }

      // Cmd + Esc
      if(key.key === 'Escape' && (key.metaKey || key.ctrl.Key)) {
        this.onCancel();
      }

      // Cmd + m
      console.log(key)
      if(key.key === 'P' && key.shiftKey && (key.metaKey || key.ctrl.Key)) {
        this.store.togglePreview();
      }
    }
  }

  onSave = () => {
    // if (this.props.title.length === 0) {
    //   alert("Please add a title before saving (hint: Write a markdown header)");
    //   return
    // }
    if (this.store.newDocument || this.store.newChildDocument) {
      this.store.saveDocument();
    } else {
      this.store.updateDocument();
    }
  }

  onCancel = () => {
    browserHistory.goBack();
  }

  onScroll = (scrollTop) => {
    this.setState({
      scrollTop,
    });
  }

  render() {
    let title = (
      <Title
        truncate={ 60 }
        placeholder={ !this.store.isFetching && 'Untitled document' }
      >
        { this.store.title }
      </Title>
    );

    let titleText = this.store.title;

    const actions = (
      <Flex>
        <HeaderAction>
          <SaveAction
            onClick={ this.onSave }
            disabled={ this.store.isSaving }
          />
        </HeaderAction>
        <DropdownMenu label={ <MoreIcon /> }>
          <MenuItem onClick={ this.store.togglePreview }>
            Preview <Switch checked={ this.store.preview } />
          </MenuItem>
          <MenuItem onClick={ this.onCancel }>
            Cancel
          </MenuItem>
        </DropdownMenu>
      </Flex>
    );

    return (
      <Layout
        actions={ actions }
        title={ title }
        titleText={ titleText }
        fixed
        loading={ this.store.isSaving }
        search={ false }
      >
        { (this.store.isFetching || !('Editor' in this.state)) ? (
          <CenteredContent>
            <AtlasPreviewLoading />
          </CenteredContent>
        ) : (
          <this.state.Editor
            store={ this.store }
            scrollTop={ this.state.scrollTop }
            onScroll={ this.onScroll }
            onSave={ this.onSave }
            onCancel={ this.onCancel }
            togglePreview={ this.togglePreview }
          />
        ) }
      </Layout>
    );
  }
}

export default DocumentEdit;