<?php

namespace SilverStripe\Core\Tests;

use SilverStripe\Dev\SapphireTest;

class MemoryLimitTest extends SapphireTest
{

    public function testIncreaseMemoryLimitTo()
    {
        if (!$this->canChangeMemory()) {
            return;
        }

        ini_set('memory_limit', '64M');

        // It can go up
        increase_memory_limit_to('128M');
        $this->assertEquals('128M', ini_get('memory_limit'));

        // But not down
        increase_memory_limit_to('64M');
        $this->assertEquals('128M', ini_get('memory_limit'));

        // Test the different kinds of syntaxes
        increase_memory_limit_to(1024*1024*200);
        $this->assertEquals(1024*1024*200, ini_get('memory_limit'));

        increase_memory_limit_to('409600K');
        $this->assertEquals('409600K', ini_get('memory_limit'));

        increase_memory_limit_to('1G');

        // If memory limit was left at 409600K, that means that the current testbox doesn't have
        // 1G of memory available.  That's okay; let's not report a failure for that.
        if (ini_get('memory_limit') != '409600K') {
            $this->assertEquals('1G', ini_get('memory_limit'));
        }

        // No argument means unlimited
        increase_memory_limit_to();
        $this->assertEquals(-1, ini_get('memory_limit'));
    }

    public function testIncreaseTimeLimitTo()
    {
        if (!$this->canChangeMemory()) {
            return;
        }

        // Can't change time limit
        if (!set_time_limit(6000)) {
            return;
        }

        // It can go up
        $this->assertTrue(increase_time_limit_to(7000));
        $this->assertEquals(7000, ini_get('max_execution_time'));

        // But not down
        $this->assertTrue(increase_time_limit_to(5000));
        $this->assertEquals(7000, ini_get('max_execution_time'));

        // 0/nothing means infinity
        $this->assertTrue(increase_time_limit_to());
        $this->assertEquals(0, ini_get('max_execution_time'));

        // Can't go down from there
        $this->assertTrue(increase_time_limit_to(10000));
        $this->assertEquals(0, ini_get('max_execution_time'));
    }


    ///////////////////

    private $origMemLimit, $origTimeLimit;

    public function setUp()
    {
        $this->origMemLimit = ini_get('memory_limit');
        $this->origTimeLimit = ini_get('max_execution_time');
        $this->origMemLimitMax = get_increase_memory_limit_max();
        $this->origTimeLimitMax = get_increase_time_limit_max();
        set_increase_memory_limit_max(-1);
        set_increase_time_limit_max(-1);
    }

    public function tearDown()
    {
        ini_set('memory_limit', $this->origMemLimit);
        set_time_limit($this->origTimeLimit);
        set_increase_memory_limit_max($this->origMemLimitMax);
        set_increase_time_limit_max($this->origTimeLimitMax);
    }

    /**
     * Determines wether the environment generally allows
     * to change the memory limits, which is not always the case.
     *
     * @return Boolean
     */
    protected function canChangeMemory()
    {
        $exts = get_loaded_extensions();
        // see http://www.hardened-php.net/suhosin/configuration.html#suhosin.memory_limit
        if (in_array('suhosin', $exts)) {
            return false;
        }

        // We can't change memory limit in safe mode
        if (ini_get('safe_mode')) {
            return false;
        }

        return true;
    }
}