/**
* Html5 File Selector
*
* This source code is licensed under the MIT license found in the
* LICENSE.txt file in the root directory of this source tree.
 */

import { expect } from 'chai';
import * as Html5FileSelector from '../src/Html5FileSelector';
require('babel-polyfill');

const MOCK_MEDIA_FILES = [
  { type: 'image/jpg', name: 'monkey_see.jpg' },
  { type: 'video/mp4', name: 'monkey_pod.mp4' },
  { type: 'image/jpg', name: 'cat1.jpg' },
  { type: 'video/mp4', name: 'cat_pile.mp4' },
  { type: 'image/jpg', name: 'dog.jpg' },
  { type: 'video/mp4', name: 'dog_barking.mp4' },
  { type: 'image/jpg', name: 'giraffe.jpg' },
  { type: 'video/mp4', name: 'giraffe_eats.mp4' },
  { type: 'image/jpg', name: 'rabbit.jpg' },
  { type: 'video/mp4', name: 'white_rabbit_song.mp4' }
];
const MOCK_INDEX_FILES = [
  { type: '', name: '.DS_Store' },
  { type: '', name: 'Thumbs.db' }
];

function fileComparator(a, b) {
    var textA = a.name;
    var textB = b.name;
    return (textA < textB) ? -1 : (textA > textB) ? 1 : 0;
}

function createDataTransferItemFile(file) {
  return {
    isDirectory: false,
    isFile: true,
    file: (callback) => { return callback(file); }
  };
}

function createDataTransferItemFolder(containedFiles) {
  return {
    isDirectory: true,
    isFile: false,
    createReader: () => {
      return {
        sentEntries: false, // not part of the actual API, just used for real API behavior mimicking
        readEntries: function(callback) {
          if (!this.sentEntries) {
            this.sentEntries = true;
            callback(containedFiles);
          } else {
            callback([]);
          }
        }
      };
    }
  };
}

function topLevelEntry(entry) {
  return {
    webkitGetAsEntry: () => {
      return entry;
    }
  }
}

describe('Html5FileSelector', () => {

  describe('.getDroppedOrSelectedFiles', () => {
    it('handles files manually selected through a HTML file picker', (done) => {
      const mockSelectedFiles = MOCK_MEDIA_FILES.slice(0,2);
      const filesSelectedEvent = {
        target: {
          files: mockSelectedFiles
        }
      };

      Html5FileSelector.getDroppedOrSelectedFiles(filesSelectedEvent).then((selectedFiles) => {
        expect(selectedFiles.map(file => file.name).join(',')).to.equal(
          mockSelectedFiles.map(file => file.name).join(',')
        );
        done();
      });
    });

    it('handles individual files dropped to a drop zone', (done) => {
      const mockDataTransferItems = [
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[0])),
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[1])),
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[2])),
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[3])),
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[4]))
      ];
      const mockFilesDroppedEvent = {
        dataTransfer: {
          items: mockDataTransferItems
        }
      };
      Html5FileSelector.getDroppedOrSelectedFiles(mockFilesDroppedEvent).then((selectedFiles) => {
        const sortedFiles = selectedFiles.sort(fileComparator);
        expect(sortedFiles.map(file => file.name).join(',')).to.equal(
          MOCK_MEDIA_FILES.slice(0,5).sort(fileComparator).map(file => file.name).join(',')
        );
        done();
      }).catch(error => {
        done(error);
      });
    });

    it('returns flattened files dropped from a mix of files and multi-nested folders dropped to a drop zone', (done) => {
      const mockDataTransferItems = [
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[0])),
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[1])),
        topLevelEntry(createDataTransferItemFolder([
          createDataTransferItemFolder([
            createDataTransferItemFile(MOCK_MEDIA_FILES[2]),
            createDataTransferItemFile(MOCK_MEDIA_FILES[3]),
            createDataTransferItemFile(MOCK_MEDIA_FILES[4])
          ]),
          createDataTransferItemFile(MOCK_MEDIA_FILES[5]),
          createDataTransferItemFile(MOCK_MEDIA_FILES[6])
        ])),
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[7])),
        topLevelEntry(createDataTransferItemFolder([
          createDataTransferItemFile(MOCK_MEDIA_FILES[8]),
          createDataTransferItemFile(MOCK_MEDIA_FILES[9])
        ]))
      ];
      const mockFilesDroppedEvent = {
        dataTransfer: {
          items: mockDataTransferItems
        }
      };
      Html5FileSelector.getDroppedOrSelectedFiles(mockFilesDroppedEvent).then((selectedFiles) => {
        const sortedFiles = selectedFiles.sort(fileComparator);
        expect(sortedFiles.map(file => file.name).join(',')).to.equal(
          MOCK_MEDIA_FILES.sort(fileComparator).map(file => file.name).join(',')
        );
        done();
      }).catch(error => {
        done(error);
      });
    });

    it('ignores OS-specific indexing files', (done) => {
      const mockDataTransferItems = [
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[0])),
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[1])),
        topLevelEntry(createDataTransferItemFolder([
          createDataTransferItemFolder([
            createDataTransferItemFile(MOCK_INDEX_FILES[0]),
            createDataTransferItemFile(MOCK_INDEX_FILES[1]),
            createDataTransferItemFile(MOCK_MEDIA_FILES[2])
          ]),
          createDataTransferItemFile(MOCK_INDEX_FILES[0]),
          createDataTransferItemFile(MOCK_MEDIA_FILES[3])
        ])),
        topLevelEntry(createDataTransferItemFile(MOCK_MEDIA_FILES[4])),
        topLevelEntry(createDataTransferItemFolder([
          createDataTransferItemFile(MOCK_INDEX_FILES[1]),
          createDataTransferItemFile(MOCK_MEDIA_FILES[5])
        ]))
      ];
      const mockFilesDroppedEvent = {
        dataTransfer: {
          items: mockDataTransferItems
        }
      };
      Html5FileSelector.getDroppedOrSelectedFiles(mockFilesDroppedEvent).then((selectedFiles) => {
        const sortedFiles = selectedFiles.sort(fileComparator);
        expect(sortedFiles.map(file => file.name).join(',')).to.equal(
          MOCK_MEDIA_FILES.slice(0,6).sort(fileComparator).map(file => file.name).join(',')
        );
        done();
      }).catch(error => {
        done(error);
      });
    });
  });
});