import Ember from 'ember';
import hbs from 'htmlbars-inline-precompile';

const { computed } = Ember;

export default Ember.Component.extend({
  layout: hbs`{{#if hasBlock}} {{yield}} {{else}} {{actionText}} {{/if}}`,
  tagName: 'a',
  role: 'button',
  attributeBindings: ['role', 'download', 'href'],
  download: computed('filename', 'extension', function() {
    return `${this.get('filename')}-${new Date().toISOString()}.${this.get('extension')}`;
  }),

  fileLike: computed('data', 'mime', 'stringify', 'download', function() {
    let file;
    let data = this.get('data');
    let filename = this.get('download');
    let mime = this.get('mime');
    if (this.get('stringify')) {
      data = JSON.stringify(data, null, 2);
    }
    if (window.navigator.msSaveOrOpenBlob) {
      file = new Blob([data], { type: mime });
      file.name = filename;
    } else {
      file = new File([data], filename, { type: mime });
    }
    return file;
  }),

  href: computed('fileLike', function() {
    return window.URL.createObjectURL(this.get('fileLike'));
  }),

  click(event) {
    if (!window.navigator.msSaveOrOpenBlob) {
      return;
    }
    event.preventDefault();
    let file = this.get('fileLike');
    //lol whyyyy
    window.navigator.msSaveOrOpenBlob(file, file.name);
  },

  actionText: 'Download',
  data: null,
  filename: null,
  mime: 'text/plain',
  extension: 'txt',
  stringify: false,
});