<?php
namespace ZendDiagnosticsTest;

use ZendDiagnostics\Check\DiskFree;

/**
 * Bytes conversion tests borrowed from Jerity project:
 *     https://github.com/jerity/jerity/blob/master/tests/Util/NumberTest.php
 *     authors:   Dave Ingram <dave@dmi.me.uk>, Nick Pope <nick@nickpope.me.uk>
 *     license:   http://creativecommons.org/licenses/BSD/ CC-BSD
 *     copyright: Copyright (c) 2010, Dave Ingram, Nick Pope

 */
class DiskFreeTest extends \PHPUnit_Framework_TestCase
{
    public static function stringToBytesProvider()
    {
        $values = array(1, 10, 12.34);
        $prefix_symbol = array('', 'k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'K', 'M', 'G');
        $prefix_name = array(
            '', 'kilo', 'mega', 'giga', 'tera', 'peta', 'exa', 'zetta', 'kibi', 'mebi', 'gibi', 'tebi',
            'pebi', 'exbi', 'kilo', 'mega', 'giga'
        );
        $multiplier_base = array(10, 10, 10, 10, 10, 10, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2);
        $multiplier_exp = array(0, 3, 6, 9, 12, 15, 18, 21, 10, 20, 30, 40, 50, 60, 10, 20, 30);
        $data = array();
        foreach ($values as $value) {
            for ($i = 0; $i < count($prefix_symbol); $i++) {
                $v = $value * pow($multiplier_base[$i], $multiplier_exp[$i]);
                $jedec = ($i >= count($prefix_symbol) - 4);
                $data[] = array("{$value}{$prefix_symbol[$i]}B", $jedec, $v);
                $data[] = array("{$value}{$prefix_symbol[$i]}Bps", $jedec, $v);
                $data[] = array("{$value}{$prefix_symbol[$i]}b", $jedec, $v / 8);
                $data[] = array("{$value}{$prefix_symbol[$i]}bps", $jedec, $v / 8);
                $data[] = array("{$value} {$prefix_symbol[$i]}B", $jedec, $v);
                $data[] = array("{$value} {$prefix_symbol[$i]}Bps", $jedec, $v);
                $data[] = array("{$value} {$prefix_symbol[$i]}b", $jedec, $v / 8);
                $data[] = array("{$value} {$prefix_symbol[$i]}bps", $jedec, $v / 8);
                $postfix = ($value == 1 ? '' : 's');
                $data[] = array("{$value}{$prefix_name[$i]}byte{$postfix}", $jedec, $v);
                $data[] = array("{$value}{$prefix_name[$i]}bit{$postfix}", $jedec, $v / 8);
                $data[] = array("{$value} {$prefix_name[$i]}byte{$postfix}", $jedec, $v);
                $data[] = array("{$value} {$prefix_name[$i]}bit{$postfix}", $jedec, $v / 8);
            }
        }

        return $data;
    }

    public static function stringToBytesExceptionProvider()
    {
        return array(
            array('Not a size.', false, 'InvalidArgumentException'),
            array('Not a size.', true, 'InvalidArgumentException'),
            array('1 KB', false, 'InvalidArgumentException'),
            array('1 TB', true, 'InvalidArgumentException'),
        );
    }

    public static function bytesToStringProvider()
    {
        return array(
            array(1125899906842624, 5, '1 PiB'),
            array(1099511627776,    5, '1 TiB'),
            array(1073741824,       5, '1 GiB'),
            array(1048576,          5, '1 MiB'),
            array(1024,             5, '1 KiB'),
            array(999,              5, '999 B'),

            array(1351079888211148, 0, '1 PiB'),
            array(1319413953331,    0, '1 TiB'),
            array(1288490190,       0, '1 GiB'),
            array(1258291,          0, '1 MiB'),
            array(1228,             0, '1 KiB'),
            array(999,              0, '999 B'),

            array(1351079888211148, 1, '1.2 PiB'),
            array(1319413953331,    1, '1.2 TiB'),
            array(1288490190,       1, '1.2 GiB'),
            array(1258291,          1, '1.2 MiB'),
            array(1228,             1, '1.2 KiB'),
            array(999,              1, '999 B'),
        );
    }

    /**
     * @dataProvider  stringToBytesProvider
     */
    public function testStringToBytes($a, $b, $c)
    {
        $this->assertEquals(DiskFree::stringToBytes($a, $b), $c);
    }

    /**
     * @dataProvider  stringToBytesExceptionProvider
     */
    public function testStringToBytesException($a, $b, $c)
    {
        $this->setExpectedException($c);
        DiskFree::stringToBytes($a, $b);
    }

    /**
     * @dataProvider  bytesToStringProvider
     */
    public function testBytesToString($bytes, $precision, $string)
    {
        $this->assertEquals($string, DiskFree::bytesToString($bytes, $precision));
    }

    public function testJitFreeSpace()
    {
        $tmp = $this->getTempDir();
        $freeRightNow = disk_free_space($tmp);
        $check = new DiskFree($freeRightNow * 0.5, $tmp);
        $result = $check->check();

        $this->assertInstanceof('ZendDiagnostics\Result\SuccessInterface', $result);

        $freeRightNow = disk_free_space($tmp);
        $check = new DiskFree($freeRightNow + 1073741824, $tmp);
        $result = $check->check();

        $this->assertInstanceof('ZendDiagnostics\Result\FailureInterface', $result);
    }

    public function testSpaceWithStringConversion()
    {
        $tmp = $this->getTempDir();
        $freeRightNow = disk_free_space($tmp);
        if ($freeRightNow < 1024) {
            $this->markTestSkipped('There is less that 1024 bytes free in temp dir');
        }

        // give some margin of error
        $freeRightNow *= 0.9;
        $freeRightNowString = DiskFree::bytesToString($freeRightNow);
        $check = new DiskFree($freeRightNowString, $tmp);
        $result = $check->check();

        $this->assertInstanceof('ZendDiagnostics\Result\SuccessInterface', $result);
    }

    public function testInvalidPathShouldReturnWarning()
    {
        $check = new DiskFree(1024, __DIR__ . '/someImprobablePath99999999999999999');
        $result = $check->check();
        $this->assertInstanceof('ZendDiagnostics\Result\WarningInterface', $result);
    }

    public function testInvalidSizeParamThrowsException()
    {
        $this->setExpectedException('InvalidArgumentException');
        new DiskFree(-1, $this->getTempDir());
    }

    public function testInvalidSizeParamThrowsException2()
    {
        $this->setExpectedException('InvalidArgumentException');
        new DiskFree(-1, $this->getTempDir());
    }

    public function testInvalidSizeParamThrowsException3()
    {
        $this->setExpectedException('InvalidArgumentException');
        new DiskFree(array(), $this->getTempDir());
    }

    public function testInvalidPathParamThrowsException()
    {
        $this->setExpectedException('InvalidArgumentException');
        new DiskFree(1024, 100);
    }

    protected function getTempDir()
    {
        // try to retrieve tmp dir
        $tmp = sys_get_temp_dir();

        // make sure there is any space there
        if (!$tmp || !is_writable($tmp) || !disk_free_space($tmp)) {
            $this->markTestSkipped(
                'Cannot find a writable temporary directory with free disk space for Check\DiskFree tests'
            );
        }

        return $tmp;
    }

}