import React, { Component } from 'react';

import { connect } from 'react-redux';

import { bindActionCreators } from 'redux';

import { Grid, Row, Col, Panel, FormGroup, ControlLabel, FormControl } from 'react-bootstrap';

import '../App.css';

import Navbar from './Navbar';

import NoteInput from './NoteInput';

import NotesList from './NotesList';

import * as sessionsActions from '../actions/sessionsActions';

import * as notesActions from '../actions/notesActions';

import _ from 'lodash';

class Session extends Component {

  onChange = (e) => {

    const { name, value } = e.target;

    const changes = { [name]: value }

    this.onChangeThrottle(changes);

  }

  onChangeThrottle = _.debounce((changes) => {

    this.props.sessionsActions.updateSession(this.props.currentSession, changes);

  }, 750)

  componentDidMount = () => {

    this.props.notesActions.loadNotesBySession({ _id: this.props.match.params.id });

  }

  renderForm() {

    if (!this.props.currentSession) {

      return (

        <form></form>

      )

    }

    return (

      <form>

        <FormGroup>

          <ControlLabel>Title</ControlLabel>

          <FormControl

            name="title"

            defaultValue={ this.props.currentSession.title }

            onChange={ this.onChange }

            type="text"

            placeholder="Enter a title for this session"

            inputRef={ ref => { this.title = ref; } }

          />

        </FormGroup>

        <FormGroup>

          <ControlLabel>Description</ControlLabel>

          <FormControl

            name="description"

            componentClass="textarea"

            defaultValue={ this.props.currentSession.description }

            onChange={ this.onChange }

            placeholder="Enter a description for this session"

            inputRef={ ref => { this.description = ref; } }

          />

        </FormGroup>

      </form>

    );

  }

  render() {

    return (

      <div>

        <Navbar history={this.props.history} />

        <Grid fluid>

          <Row>

            <Col md={3}>

              <Panel>

                { this.renderForm() }

              </Panel>

            </Col>

            <Col md={9}>

              <NotesList notes={this.props.notes} />

            </Col>

          </Row>

        </Grid>

      </div>

    );

  }

}

function mapStateToProps(state, props) {

  const sessionId = props.match.params.id;

  const sessions = state.get('sessions');

  const notes = state.get('notes');

  const currentSession = sessions.find(session => session._id === sessionId);

  return {

    currentSession,

    sessions,

    notes,

  };

}

function mapDispatchToProps(dispatch) {

  return {

    sessionsActions: bindActionCreators(sessionsActions, dispatch),

    notesActions: bindActionCreators(notesActions, dispatch),

  }

}

export default connect(mapStateToProps, mapDispatchToProps)(Session);