// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @fileoverview Tests for the liblouis Native Client wrapper, as seen from
 *    the JavaScript interface.
 */

// Include test fixture.
GEN_INCLUDE(['../testing/chromevox_e2e_test_base.js',
             '../testing/assert_additions.js']);

/**
 * @constructor
 * @extends {ChromeVoxE2ETest}
 */
function CvoxLibLouisTest() {}

CvoxLibLouisTest.prototype = {
  __proto__: ChromeVoxE2ETest.prototype,

  /** @override */
  setUp: function() {
    // Avoid loading a second liblouis instance and get the one that chromevox
    // is already creating.
    this.instance = cvox.ChromeVox.braille.getLibLouisForTest();
  },
};

function assertEqualsUint8Array(expected, actual) {
  var as_array = [];
  var uint8array = new Uint8Array(actual);
  for (var i = 0; i < uint8array.length; ++i) {
    as_array[i] = uint8array[i];
  }
  assertEqualsJSON(expected, as_array);
}

TEST_F('CvoxLibLouisTest', 'checkAllTables', function() {
  cvox.BrailleTable.getAll(function(all_tables) {
    var i = 0;
    var checkNextTable = function() {
      var table = all_tables[i++];
      if (table) {
        this.instance.getTranslator(table.fileNames, function(translator) {
          assertNotEquals(null, translator,
                             'Table ' + table + ' should be valid');
          checkNextTable();
        });
      } else {
        testDone();
      }
    }.bind(this);
    checkNextTable();
  }.bind(this));
});

TEST_F('CvoxLibLouisTest', 'testTranslateComputerBraille', function () {
  this.instance.getTranslator('en-us-comp8.ctb', function(translator) {
    translator.translate(
        'Hello!', function(cells, textToBraille, brailleToText) {
          assertEqualsUint8Array([0x53, 0x11, 0x07, 0x07, 0x15, 0x2e], cells);
          assertEqualsJSON([0, 1, 2, 3, 4, 5], textToBraille);
          assertEqualsJSON([0, 1, 2, 3, 4, 5], brailleToText);
          testDone();
        });
  });
});

TEST_F('CvoxLibLouisTest', 'testBackTranslateComputerBraille', function() {
  this.instance.getTranslator('en-us-comp8.ctb', function(translator) {
    var cells = new Uint8Array([0x53, 0x11, 0x07, 0x07, 0x15, 0x2e]);
    translator.backTranslate(cells.buffer, function(text) {
      assertEquals('Hello!', text);
      testDone();
    });
  });
});

TEST_F('CvoxLibLouisTest', 'testTranslateGermanGrade2Braille', function() {
  // This is one of the moderately large tables.
  this.instance.getTranslator('de-de-g2.ctb', function(translator) {
    translator.translate(
         'München', function(cells, textToBraille, brailleToText) {
           assertEqualsUint8Array([0x0d, 0x33, 0x1d, 0x39, 0x09], cells);
           assertEqualsJSON([0, 1, 2, 3, 3, 4, 4], textToBraille);
           assertEqualsJSON([0, 1, 2, 3, 5], brailleToText);
           testDone();
         });
  });
});

TEST_F('CvoxLibLouisTest', 'testBackTranslateGermanComputerBraille', function() {
  this.instance.getTranslator('de-de-comp8.ctb', function(translator) {
    var cells = new Uint8Array([0xb3]);
    translator.backTranslate(cells.buffer, function(text) {
      assertEquals('ü', text);
      testDone();
    });
  });
});

TEST_F('CvoxLibLouisTest', 'testBackTranslateEmptyCells', function() {
  this.instance.getTranslator('de-de-comp8.ctb', function(translator) {
    var cells = new Uint8Array();
    translator.backTranslate(cells.buffer, function(text) {
      assertNotEquals(null, text);
      assertEquals(0, text.length);
      testDone();
    });
  });
});

TEST_F('CvoxLibLouisTest', 'testGetTranslatorBeforeAttach', function() {
  this.instance.detach();
   assertFalse(this.instance.isAttached());
  this.instance.getTranslator('en-us-comp8.ctb', function(translator) {
    assertNotEquals(null, translator);
    testDone();
  });
  this.instance.attachToElement(document.body);
});

TEST_F('CvoxLibLouisTest', 'testGetInvalidTranslator', function() {
  this.instance.getTranslator('nonexistant-table', function(translator) {
    assertEquals(null, translator);
    testDone();
  });
});