<?php
require_once 'PHPUnit/Framework.php';
require_once 'PHPUnit/TextUI/TestRunner.php';

require_once(dirname(__FILE__) . '/../../PHPSkills/Numerics/Matrix.php');

use \PHPUnit_Framework_TestCase;
use Moserware\Numerics\SquareMatrix;

class MatrixTest extends PHPUnit_Framework_TestCase
{
    public function testTwoByTwoDeterminant()
    {
        $a = new SquareMatrix(1, 2,
                              3, 4);

        $this->assertEquals(-2, $a->getDeterminant());

        $b = new SquareMatrix(3, 4,
                              5, 6);

        $this->assertEquals(-2, $b->getDeterminant());

        $c = new SquareMatrix(1, 1,
                              1, 1);

        $this->assertEquals(0, $c->getDeterminant());

        $d = new SquareMatrix(12, 15,
                              17, 21);

        $this->assertEquals(12 * 21 - 15 * 17, $d->getDeterminant());
    }

    public function testThreeByThreeDeterminant()
    {
        $a = new SquareMatrix(1, 2, 3,
                              4, 5, 6,
                              7, 8, 9);
        $this->assertEquals(0, $a->getDeterminant());

        $pi = new SquareMatrix(3, 1, 4,
                               1, 5, 9,
                               2, 6, 5);

        // Verified against http://www.wolframalpha.com/input/?i=determinant+%7B%7B3%2C1%2C4%7D%2C%7B1%2C5%2C9%7D%2C%7B2%2C6%2C5%7D%7D
        $this->assertEquals(-90, $pi->getDeterminant());
    }

    public function testFourByFourDeterminant()
    {
        $a = new SquareMatrix( 1,  2,  3,  4,
                               5,  6,  7,  8,
                               9, 10, 11, 12,
                              13, 14, 15, 16);

        $this->assertEquals(0, $a->getDeterminant());

        $pi = new SquareMatrix(3, 1, 4, 1,
                               5, 9, 2, 6,
                               5, 3, 5, 8,
                               9, 7, 9, 3);

        // Verified against http://www.wolframalpha.com/input/?i=determinant+%7B+%7B3%2C1%2C4%2C1%7D%2C+%7B5%2C9%2C2%2C6%7D%2C+%7B5%2C3%2C5%2C8%7D%2C+%7B9%2C7%2C9%2C3%7D%7D
        $this->assertEquals(98, $pi->getDeterminant());
    }
    
    public function testEightByEightDeterminant()
    {
        $a = new SquareMatrix( 1,  2,  3,  4,  5,  6,  7,  8,
                               9, 10, 11, 12, 13, 14, 15, 16,
                              17, 18, 19, 20, 21, 22, 23, 24,
                              25, 26, 27, 28, 29, 30, 31, 32,
                              33, 34, 35, 36, 37, 38, 39, 40,
                              41, 42, 32, 44, 45, 46, 47, 48,
                              49, 50, 51, 52, 53, 54, 55, 56,
                              57, 58, 59, 60, 61, 62, 63, 64);

        $this->assertEquals(0, $a->getDeterminant());

        $pi = new SquareMatrix(3, 1, 4, 1, 5, 9, 2, 6,
                               5, 3, 5, 8, 9, 7, 9, 3,
                               2, 3, 8, 4, 6, 2, 6, 4,
                               3, 3, 8, 3, 2, 7, 9, 5,
                               0, 2, 8, 8, 4, 1, 9, 7,
                               1, 6, 9, 3, 9, 9, 3, 7,
                               5, 1, 0, 5, 8, 2, 0, 9,
                               7, 4, 9, 4, 4, 5, 9, 2);

        // Verified against http://www.wolframalpha.com/input/?i=det+%7B%7B3%2C1%2C4%2C1%2C5%2C9%2C2%2C6%7D%2C%7B5%2C3%2C5%2C8%2C9%2C7%2C9%2C3%7D%2C%7B2%2C3%2C8%2C4%2C6%2C2%2C6%2C4%7D%2C%7B3%2C3%2C8%2C3%2C2%2C7%2C9%2C5%7D%2C%7B0%2C2%2C8%2C8%2C4%2C1%2C9%2C7%7D%2C%7B1%2C6%2C9%2C3%2C9%2C9%2C3%2C7%7D%2C%7B5%2C1%2C0%2C5%2C8%2C2%2C0%2C9%7D%2C%7B7%2C4%2C9%2C4%2C4%2C5%2C9%2C2%7D%7D
        $this->assertEquals(1378143, $pi->getDeterminant());
    }
}

$testSuite = new \PHPUnit_Framework_TestSuite();
$testSuite->addTest( new MatrixTest("testFourByFourDeterminant"));
$testSuite->addTest( new MatrixTest("testEightByEightDeterminant"));

\PHPUnit_TextUI_TestRunner::run($testSuite);

?>