// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Tests for arbitrary base conversion library baseconversion.js.
 */

goog.provide('goog.crypt.baseNTest');
goog.setTestOnly('goog.crypt.baseNTest');

goog.require('goog.crypt.baseN');
goog.require('goog.testing.jsunit');

function testDecToHex() {
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '0',
      goog.crypt.baseN.BASE_LOWERCASE_HEXADECIMAL, '0');
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '9',
      goog.crypt.baseN.BASE_UPPERCASE_HEXADECIMAL, '9');
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '13',
      goog.crypt.baseN.BASE_LOWERCASE_HEXADECIMAL, 'd');
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '255',
      goog.crypt.baseN.BASE_UPPERCASE_HEXADECIMAL, 'FF');
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '53425987345897',
      goog.crypt.baseN.BASE_LOWERCASE_HEXADECIMAL, '309734ff5de9');
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '987080888',
      goog.crypt.baseN.BASE_UPPERCASE_HEXADECIMAL, '3AD5A8B8');
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '009341587237',
      goog.crypt.baseN.BASE_LOWERCASE_HEXADECIMAL, '22ccd4f25');
}

function testBinToDec() {
  verifyConversion(
      goog.crypt.baseN.BASE_BINARY,
      '11101010101000100010010000010010010000111101000100110111000000100001' +
          '01100100111110110010000010110100111101000010010100001011111011111100' +
          '00000010000010000101010101000000000101100000000100011111011101111001' +
          '10000001000000000100101110001001001101101001101111010101111100010001' +
          '11011100000110111000000100111011100100010010011001111011001111001011' +
          '10001000101111001010011101101100110110011110010000011100101011110010' +
          '11010001001111110011000000001001011011111011010000110011010000010111' +
          '10111100000001100010111100000100000000110001011101011110100000011010' +
          '0110000100011111',
      goog.crypt.baseN.BASE_DECIMAL,
      '34589745906769047354795784390596748934723904739085568907689045723489' +
          '05745789789078907890789023447892365623589745678902348976234598723459' +
          '087523496723486089723459078349087');
}

function testDecToBin() {
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL,
      '00342589674590347859734908573490568347534805468907960579056785605496' +
          '83475873465859072390486756098742380573908572390463805745656623475234' +
          '82345670247851902784123897349486238502378940637925807378946358964328' +
          '57906148572346857346409823758034763928401296023947234784623765456367' +
          '764623627623574',
      goog.crypt.baseN.BASE_BINARY,
      '10010011011100101010001111100111001100110000110111111110010110101000' +
          '01010110110010000111000001100110100101010000101001100001011000101111' +
          '01011101111100101101010010000111011110011110010101111001110010100100' +
          '10111110000101111011010000000111111011110010011110101011100101000001' +
          '00011000101010011001101000011101001010001101011110101001011011100101' +
          '11100000101000010010101001011001100100101110111101010000011010001010' +
          '01011100100111110001100111100100011001001001100011011100100111011111' +
          '01000100101001000100110001011010010000011010111101111111111111110100' +
          '01100101001111001111100110101000001100100000111111100101110010111011' +
          '10110110001100100011101010110110100001001000101011001001100011010110' +
          '10110100000110000110010111110100000100110110010010010101111001001111' +
          '11100100000010101111110100011010011101011010001101110011100110111111' +
          '11000100001111010000000101011011000010010000000100111111010110111100' +
          '00101111010011011010011010010001000101100001111001110010010110');
}

function test7To9() {
  verifyConversion(
      '0123456',  // Base 7.
      '60625646056660665666066534602566346056634560665606666656465634265434' +
          '66563465664566346406366534664656650660665623456663456654360665',
      '012345678',  // Base 9.
      '11451222686557606458341381287142358175337801548087003804852781764284' +
          '273762357630423116743334671762638240652740158536');
}

function testZeros() {
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '0',
      goog.crypt.baseN.BASE_LOWERCASE_HEXADECIMAL, '0');
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '000',
      goog.crypt.baseN.BASE_LOWERCASE_HEXADECIMAL, '0');
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '0000007',
      goog.crypt.baseN.BASE_LOWERCASE_HEXADECIMAL, '7');
}

function testArbitraryBases() {
  verifyConversion(
      'X9(',  // Base 3.
      '9(XX((9X(XX9(9X9(X9(',
      'a:*o9',  // Base 5.
      ':oa**:9o9**9oo');
}

function testEmptyBases() {
  var e = assertThrows(function() {
    goog.crypt.baseN.recodeString('1230', '', '0123');
  });
  assertEquals(
      'Exception message', 'Number 1230 contains a character ' +
          'not found in base , which is 0',
      e.message);

  e = assertThrows(function() {
    goog.crypt.baseN.recodeString('1230', '0123', '');
  });
  assertEquals('Exception message', 'Empty output base', e.message);
}

function testInvalidDigits() {
  var e = assertThrows(function() {
    goog.crypt.baseN.recodeString('123x456', '01234567', '01234567');
  });
  assertEquals(
      'Exception message', 'Number 123x456 contains a character ' +
          'not found in base 01234567, which is x',
      e.message);
}

function makeHugeBase() {
  // Number of digits in the base.
  // Tests break if this is set to 200'000.  The reason for that is
  // String.fromCharCode(196609) == String.fromCharCode(1).
  var baseSize = 20000;
  var tab = [];
  for (var i = 0; i < baseSize; i++) {
    tab.push(String.fromCharCode(i));
  }
  return tab.join('');
}

function testHugeInputBase() {
  verifyConversion(
      makeHugeBase(), String.fromCharCode(12345), goog.crypt.baseN.BASE_DECIMAL,
      '12345');
}

function testHugeOutputBase() {
  verifyConversion(
      goog.crypt.baseN.BASE_DECIMAL, '12345', makeHugeBase(),
      String.fromCharCode(12345));
}

function verifyConversion(inputBase, inputNumber, outputBase, outputNumber) {
  assertEquals(
      outputNumber,
      goog.crypt.baseN.recodeString(inputNumber, inputBase, outputBase));
}