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<?php

/**

 * @file

 * Contains \CtoolsMathExpressionTestCase.

 */

/**

 * Tests the MathExpression library of ctools.

 */

class CtoolsMathExpressionTestCase extends DrupalWebTestCase {

  public static function getInfo() {

    return array(

      'name' => 'CTools math expression tests',

      'description' => 'Test the math expression library of ctools.',

      'group' => 'ctools',

    );

  }

  public function setUp() {

    parent::setUp('ctools', 'ctools_plugin_test');

  }

  /**

   * Returns a random double between 0 and 1.

   */

  protected function rand01() {

    return rand(0, PHP_INT_MAX) / PHP_INT_MAX;

  }

  /**

   * A custom assertion with checks the values in a certain range.

   */

  protected function assertFloat($first, $second, $delta = 0.0000001, $message = '', $group = 'Other') {

    return $this->assert(abs($first - $second) <= $delta, $message ? $message : t('Value @first is equal to value @second.', array('@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE))), $group);

  }

  public function testArithmetic() {

    $math_expression = new ctools_math_expr();

    // Test constant expressions.

    $this->assertEqual($math_expression->e('2'), 2);

    $random_number = rand(0, 10);

    $this->assertEqual($random_number, $math_expression->e((string) $random_number));

    // Test simple arithmetic.

    $random_number_a = rand(5, 10);

    $random_number_b = rand(5, 10);

    $this->assertEqual($random_number_a + $random_number_b, $math_expression->e("$random_number_a + $random_number_b"));

    $this->assertEqual($random_number_a - $random_number_b, $math_expression->e("$random_number_a - $random_number_b"));

    $this->assertEqual($random_number_a * $random_number_b, $math_expression->e("$random_number_a * $random_number_b"));

    $this->assertEqual($random_number_a / $random_number_b, $math_expression->e("$random_number_a / $random_number_b"));

    // Test Associative property.

    $random_number_c = rand(5, 10);

    $this->assertEqual($math_expression->e("$random_number_a + ($random_number_b + $random_number_c)"), $math_expression->e("($random_number_a + $random_number_b) + $random_number_c"));

    $this->assertEqual($math_expression->e("$random_number_a * ($random_number_b * $random_number_c)"), $math_expression->e("($random_number_a * $random_number_b) * $random_number_c"));

    // Test Commutative property.

    $this->assertEqual($math_expression->e("$random_number_a + $random_number_b"), $math_expression->e("$random_number_b + $random_number_a"));

    $this->assertEqual($math_expression->e("$random_number_a * $random_number_b"), $math_expression->e("$random_number_b * $random_number_a"));

    // Test Distributive property.

    $this->assertEqual($math_expression->e("($random_number_a + $random_number_b) * $random_number_c"), $math_expression->e("($random_number_a * $random_number_c + $random_number_b * $random_number_c)"));

    $this->assertEqual(pow($random_number_a, $random_number_b), $math_expression->e("$random_number_a ^ $random_number_b"));

  }

  public function testBuildInFunctions() {

    $math_expression = new ctools_math_expr();

    // @todo: maybe run this code multiple times to test different values.

    $random_double = $this->rand01();

    $random_int = rand(5, 10);

    $this->assertFloat(sin($random_double), $math_expression->e("sin($random_double)"));

    $this->assertFloat(cos($random_double), $math_expression->e("cos($random_double)"));

    $this->assertFloat(tan($random_double), $math_expression->e("tan($random_double)"));

    $this->assertFloat(exp($random_double), $math_expression->e("exp($random_double)"));

    $this->assertFloat(sqrt($random_double), $math_expression->e("sqrt($random_double)"));

    $this->assertFloat(log($random_double), $math_expression->e("ln($random_double)"));

    $this->assertFloat(round($random_double), $math_expression->e("round($random_double)"));

    $this->assertFloat(abs($random_double + $random_int), $math_expression->e('abs(' . ($random_double + $random_int) . ')'));

    $this->assertEqual(round($random_double + $random_int), $math_expression->e('round(' . ($random_double + $random_int) . ')'));

    $this->assertEqual(ceil($random_double + $random_int), $math_expression->e('ceil(' . ($random_double + $random_int) . ')'));

    $this->assertEqual(floor($random_double + $random_int), $math_expression->e('floor(' . ($random_double + $random_int) . ')'));

    // @fixme: you can't run time without an argument.

    $this->assertFloat(time(), $math_expression->e('time(1)'));

    $random_double_a = $this->rand01();

    $random_double_b = $this->rand01();

    // @fixme: max/min don't work at the moment.

//    $this->assertFloat(max($random_double_a, $random_double_b), $math_expression->e("max($random_double_a, $random_double_b)"));

//    $this->assertFloat(min($random_double_a, $random_double_b), $math_expression->e("min($random_double_a, $random_double_b)"));

  }

  public function testVariables() {

    $math_expression = new ctools_math_expr();

    $random_number_a = rand(5, 10);

    $random_number_b = rand(5, 10);

    // Store the first random number and use it on calculations.

    $math_expression->e("var = $random_number_a");

    $this->assertEqual($random_number_a + $random_number_b, $math_expression->e("var + $random_number_b"));

    $this->assertEqual($random_number_a * $random_number_b, $math_expression->e("var * $random_number_b"));

    $this->assertEqual($random_number_a - $random_number_b, $math_expression->e("var - $random_number_b"));

    $this->assertEqual($random_number_a / $random_number_b, $math_expression->e("var / $random_number_b"));

  }

  public function testCustomFunctions() {

    $math_expression = new ctools_math_expr();

    $random_number_a = rand(5, 10);

    $random_number_b = rand(5, 10);

    // Create a one-argument function.

    $math_expression->e("f(x) = 2 * x");

    $this->assertEqual($random_number_a * 2, $math_expression->e("f($random_number_a)"));

    $this->assertEqual($random_number_b * 2, $math_expression->e("f($random_number_b)"));

    // Create a two-argument function.

    $math_expression->e("g(x, y) = 2 * x + y");

    $this->assertEqual($random_number_a * 2 + $random_number_b, $math_expression->e("g($random_number_a, $random_number_b)"));

    // Use a custom function in another function.

    $this->assertEqual(($random_number_a * 2 + $random_number_b) * 2, $math_expression->e("f(g($random_number_a, $random_number_b))"));

  }

}