import React from 'react';
import ProgressBar from 'components/ProgressBar';
import request from 'utils/request';

class ChannelCreateForm extends React.Component {
  constructor (props) {
    super(props);
    this.state = {
      error   : null,
      channel : '',
      password: '',
      status  : null,
    };
    this.handleChannelInput = this.handleChannelInput.bind(this);
    this.handleInput = this.handleInput.bind(this);
    this.createChannel = this.createChannel.bind(this);
  }
  cleanseChannelInput (input) {
    input = input.replace(/\s+/g, '-'); // replace spaces with dashes
    input = input.replace(/[^A-Za-z0-9-]/g, '');  // remove all characters that are not A-Z, a-z, 0-9, or '-'
    return input;
  }
  handleChannelInput (event) {
    let value = event.target.value;
    value = this.cleanseChannelInput(value);
    this.setState({channel: value});
    if (value) {
      this.updateIsChannelAvailable(value);
    } else {
      this.setState({error: 'Please enter a channel name'});
    }
  }
  handleInput (event) {
    const name = event.target.name;
    const value = event.target.value;
    this.setState({[name]: value});
  }
  updateIsChannelAvailable (channel) {
    const channelWithAtSymbol = `@${channel}`;
    request(`/api/channel/availability/${channelWithAtSymbol}`)
      .then(() => {
        this.setState({'error': null});
      })
      .catch((error) => {
        this.setState({'error': error.message});
      });
  }
  checkIsChannelAvailable (channel) {
    const channelWithAtSymbol = `@${channel}`;
    return request(`/api/channel/availability/${channelWithAtSymbol}`);
  }
  checkIsPasswordProvided (password) {
    return new Promise((resolve, reject) => {
      if (!password || password.length < 1) {
        return reject(new Error('Please provide a password'));
      }
      resolve();
    });
  }
  makePublishChannelRequest (username, password) {
    const params = {
      method : 'POST',
      body   : JSON.stringify({username, password}),
      headers: new Headers({
        'Content-Type': 'application/json',
      }),
      credentials: 'include',
    };
    return new Promise((resolve, reject) => {
      request('/signup', params)
        .then(result => {
          return resolve(result);
        })
        .catch(error => {
          reject(new Error(`Unfortunately, we encountered an error while creating your channel. Please let us know in Discord! ${error.message}`));
        });
    });
  }
  createChannel (event) {
    event.preventDefault();
    this.checkIsPasswordProvided(this.state.password)
      .then(() => {
        return this.checkIsChannelAvailable(this.state.channel);
      })
      .then(() => {
        this.setState({status: 'We are publishing your new channel.  Sit tight...'});
        return this.makePublishChannelRequest(this.state.channel, this.state.password);
      })
      .then(result => {
        this.setState({status: null});
        this.props.onChannelLogin(result.channelName, result.shortChannelId, result.channelClaimId);
      })
      .catch((error) => {
        if (error.message) {
          this.setState({'error': error.message, status: null});
        } else {
          this.setState({'error': error, status: null});
        };
      });
  }
  render () {
    return (
      <div>
        { !this.state.status ? (
          <form id='publish-channel-form'>
            <div className='row row--wide row--short'>
              <div className='column column--3 column--sml-10'>
                <label className='label' htmlFor='new-channel-name'>Name:</label>
              </div><div className='column column--6 column--sml-10'>
                <div className='input-text--primary flex-container--row flex-container--left-bottom span--relative'>
                  <span>@</span>
                  <input type='text' name='channel' id='new-channel-name' className='input-text' placeholder='exampleChannelName' value={this.state.channel} onChange={this.handleChannelInput} />
                  { (this.state.channel && !this.state.error) && <span id='input-success-channel-name' className='info-message--success span--absolute'>{'\u2713'}</span> }
                  { this.state.error && <span id='input-success-channel-name' className='info-message--failure span--absolute'>{'\u2716'}</span> }
                </div>
              </div>
            </div>
            <div className='row row--wide row--short'>
              <div className='column column--3 column--sml-10'>
                <label className='label' htmlFor='new-channel-password'>Password:</label>
              </div><div className='column column--6 column--sml-10'>
                <div className='input-text--primary'>
                  <input type='password' name='password' id='new-channel-password' className='input-text'  placeholder='' value={this.state.password} onChange={this.handleInput} />
                </div>
              </div>
            </div>
            {this.state.error ? (
              <p className='info-message--failure'>{this.state.error}</p>
            ) : (
              <p className='info-message'>Choose a name and password for your channel</p>
            )}
            <div className='row row--wide'>
              <button className='button--primary' onClick={this.createChannel}>Create Channel</button>
            </div>
          </form>
        ) : (
          <div>
            <p className='fine-print'>{this.state.status}</p>
            <ProgressBar size={12} />
          </div>
        )}
      </div>
    );
  }
}

export default ChannelCreateForm;