import React from 'react';
import { withRouter } from 'react-router-dom';
import Dropzone from 'containers/Dropzone';
import PublishTitleInput from 'containers/PublishTitleInput';
import PublishUrlInput from 'containers/PublishUrlInput';
import PublishThumbnailInput from 'containers/PublishThumbnailInput';
import PublishMetadataInputs from 'containers/PublishMetadataInputs';
import ChannelSelect from 'containers/ChannelSelect';
import * as publishStates from 'constants/publish_claim_states';

class PublishForm extends React.Component {
  constructor (props) {
    super(props);
    // this.makePublishRequest = this.makePublishRequest.bind(this);
    this.publish = this.publish.bind(this);
  }
  validateChannelSelection () {
    console.log('validating channel selection');
    // make sure all required data is provided
    return new Promise((resolve, reject) => {
      // if publishInChannel is true, is a channel selected & logged in?
      if (this.props.publishInChannel && (this.props.selectedChannel !== this.props.loggedInChannel.name)) {
        // update state with error
        this.props.onChannelSelectionError('Log in to a channel or select Anonymous"');
        // reject this promise
        return reject(new Error('Fix the channel'));
      }
      resolve();
    });
  }
  validatePublishParams () {
    console.log('validating publish params');
    // make sure all required data is provided
    return new Promise((resolve, reject) => {
      // is there a file?
      if (!this.props.file) {
        return reject(new Error('Please choose a file'));
      }
      // is there a claim chosen?
      if (!this.props.claim) {
        return reject(new Error('Please enter a URL'));
      }
      if (this.props.urlError) {
        return reject(new Error('Fix the url'));
      }
      resolve();
    });
  }
  makePublishRequest (file, metadata) {
    console.log('making publish request');
    const uri = '/api/claim/publish';
    const xhr = new XMLHttpRequest();
    const fd = this.appendDataToFormData(file, metadata);
    xhr.upload.addEventListener('loadstart', () => {
      this.props.onPublishStatusChange(publishStates.LOAD_START, 'upload started');
    });
    xhr.upload.addEventListener('progress', (e) => {
      if (e.lengthComputable) {
        const percentage = Math.round((e.loaded * 100) / e.total);
        console.log('progress:', percentage);
        this.props.onPublishStatusChange(publishStates.LOADING, `${percentage}%`);
      }
    }, false);
    xhr.upload.addEventListener('load', () => {
      console.log('loaded 100%');
      this.props.onPublishStatusChange(publishStates.PUBLISHING, null);
    }, false);
    xhr.open('POST', uri, true);
    xhr.onreadystatechange = () => {
      if (xhr.readyState === 4) {
        const response = JSON.parse(xhr.response);
        console.log('publish response:', response);
        if ((xhr.status === 200) && response.success) {
          this.props.history.push(`/${response.data.claimId}/${response.data.name}`);
          this.props.onFileClear();
        } else {
          this.props.onPublishStatusChange(publishStates.FAILED, response.message);
        }
      }
    };
    // Initiate a multipart/form-data upload
    xhr.send(fd);
  }
  createMetadata () {
    console.log('creating metadata');
    let metadata = {
      name       : this.props.claim,
      title      : this.props.title,
      description: this.props.description,
      license    : this.props.license,
      nsfw       : this.props.nsfw,
      type       : this.props.file.type,
      thumbnail  : this.props.thumbnail,
    };
    if (this.props.publishInChannel) {
      metadata['channelName'] = this.props.selectedChannel;
    }
    return metadata;
  }
  appendDataToFormData (file, metadata) {
    var fd = new FormData();
    fd.append('file', file);
    for (var key in metadata) {
      if (metadata.hasOwnProperty(key)) {
        fd.append(key, metadata[key]);
      }
    }
    return fd;
  }
  publish () {
    console.log('publishing file');
    // publish the asset
    this.validateChannelSelection()
      .then(() => {
        return this.validatePublishParams();
      })
      .then(() => {
        const metadata = this.createMetadata();
        // publish the claim
        return this.makePublishRequest(this.props.file, metadata);
      })
      .catch((error) => {
        this.props.onPublishSubmitError(error.message);
      });
  }
  render () {
    return (
      <div className='row row--no-bottom'>
        <div className='column column--10'>
          <PublishTitleInput />
        </div>
        {/* left column */}
        <div className='column column--5 column--sml-10' >
          <div className='row row--padded'>
            <Dropzone />
          </div>
        </div>
        {/* right column */}
        <div className='column column--5 column--sml-10 align-content-top'>
          <div id='publish-active-area' className='row row--padded'>
            <div className='row row--padded row--no-top row--wide'>
              <PublishUrlInput />
            </div>
            <div className='row row--padded row--no-top row--wide'>
              <ChannelSelect />
            </div>
            { (this.props.file.type === 'video/mp4') && (
              <div className='row row--padded row--no-top row--wide '>
                <PublishThumbnailInput />
              </div>
            )}
            <div className='row row--padded row--no-top row--no-bottom row--wide'>
              <PublishMetadataInputs />
            </div>
            <div className='row row--wide align-content-center'>
              <button id='publish-submit' className='button--primary button--large' onClick={this.publish}>Publish</button>
            </div>
            <div className='row row--padded row--no-bottom align-content-center'>
              <button className='button--cancel' onClick={this.props.onFileClear}>Cancel</button>
            </div>
            <div className='row row--short align-content-center'>
              <p className='fine-print'>By clicking 'Publish', you affirm that you have the rights to publish this content to the LBRY network, and that you understand the properties of publishing it to a decentralized, user-controlled network. <a className='link--primary' target='_blank' href='https://lbry.io/learn'>Read more.</a></p>
            </div>
          </div>
        </div>
      </div>
    );
  }
};

export default withRouter(PublishForm);