import React, { Component } from 'react';

import { connect } from 'react-redux';

import { bindActionCreators } from 'redux';

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

import '../App.css';

import Navbar from './Navbar';

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

class Login extends Component {

  login = () => {

    this.props.authActions.loginSubmit(username, password);

  }

  submit = (e) => {

    e.preventDefault();

    this.login();

  }

  onClickRegister = (e) => {

    e.preventDefault();

    this.props.history.push('/register');

  }

  renderErrorMessage(errorMessages, fieldname) {

    if (errorMessages && errorMessages.has(fieldname)) {

      return errorMessages.get(fieldname).map((message, key) =>

        <HelpBlock key={ key }>{ message }</HelpBlock>

      );

    }

  }

  renderNonFieldErrors(errorMessages) {

    if (errorMessages && errorMessages.has('non_field_errors')) {

      const errors = errorMessages.get('non_field_errors');

      return (

        <Alert bsStyle="danger">

        { errors.map((message, key) =>

          <p key={ key }>{ message }</p>

        ) }

        </Alert>

      )

    }

  }

  render() {

    const panelHeader = (

      <h4 className="text-uppercase text-center">Login</h4>

    )

    const errorMessages = this.props.login.get('errorMessages');

    return (

      <div>

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

        <Grid fluid>

          <Row>

            <Col md={6} mdOffset={3}>

              <Panel header={ panelHeader } className="panel-login">

                <form onSubmit={this.submit}>

                  <FormGroup validationState={ errorMessages && errorMessages.has('username') ? 'error' : null }>

                    <ControlLabel>Username</ControlLabel>

                    { this.renderErrorMessage(errorMessages, 'username') }

                  </FormGroup>

                  <FormGroup validationState={ errorMessages && errorMessages.has('password') ? 'error' : null }>

                    <ControlLabel>Password</ControlLabel>

                    { this.renderErrorMessage(errorMessages, 'password') }

                  </FormGroup>

                  { this.renderNonFieldErrors(errorMessages) }

                  <Button type="submit" block bsStyle="primary" onClick={this.login}>Login</Button>

                </form>

              </Panel>

              <p className="text-center">

                <a className="text-muted" href="/register" onClick={ this.onClickRegister }>Not registered yet? Create an account.</a>

              </p>

            </Col>

          </Row>

        </Grid>

      </div>

    );

  }

}

function mapStateToProps(state, props) {

  return {

    login: state.get('login')

  };

}

function mapDispatchToProps(dispatch) {

  return {

    authActions: bindActionCreators(authActions, dispatch)

  }

}

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