<?php
/**
 * CakePHP(tm) Tests <http://book.cakephp.org/2.0/en/development/testing.html>
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://book.cakephp.org/2.0/en/development/testing.html CakePHP(tm) Tests
 * @since         1.2.0
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Test\TestCase\Cache;

use Cake\Cache\Cache;
use Cake\Cache\Engine\FileEngine;
use Cake\Core\App;
use Cake\Core\Configure;
use Cake\Core\Plugin;
use Cake\TestSuite\TestCase;

/**
 * CacheTest class
 *
 */
class CacheTest extends TestCase
{

    /**
     * setUp method
     *
     * @return void
     */
    public function setUp()
    {
        parent::setUp();
        Cache::enable();
    }

    /**
     * tearDown method
     *
     * @return void
     */
    public function tearDown()
    {
        parent::tearDown();
        Cache::drop('tests');
        Cache::drop('test_trigger');
    }

    /**
     * Configure cache settings for test
     *
     * @return void
     */
    protected function _configCache()
    {
        Cache::config('tests', [
            'engine' => 'File',
            'path' => TMP,
            'prefix' => 'test_'
        ]);
    }

    /**
     * Check that no fatal errors are issued doing normal things when Cache.disable is true.
     *
     * @return void
     */
    public function testNonFatalErrorsWithCacheDisable()
    {
        Cache::disable();
        $this->_configCache();

        $this->assertNull(Cache::write('no_save', 'Noooo!', 'tests'));
        $this->assertFalse(Cache::read('no_save', 'tests'));
        $this->assertNull(Cache::delete('no_save', 'tests'));
    }

    /**
     * Check that a null instance is returned from engine() when caching is disabled.
     *
     * @return void
     */
    public function testNullEngineWhenCacheDisable()
    {
        $this->_configCache();
        Cache::disable();

        $result = Cache::engine('tests');
        $this->assertInstanceOf('Cake\Cache\Engine\NullEngine', $result);
    }

    /**
     * test configuring CacheEngines in App/libs
     *
     * @return void
     */
    public function testConfigWithLibAndPluginEngines()
    {
        Configure::write('App.namespace', 'TestApp');
        Plugin::load('TestPlugin');

        $config = ['engine' => 'TestAppCache', 'path' => TMP, 'prefix' => 'cake_test_'];
        Cache::config('libEngine', $config);
        $engine = Cache::engine('libEngine');
        $this->assertInstanceOf('TestApp\Cache\Engine\TestAppCacheEngine', $engine);

        $config = ['engine' => 'TestPlugin.TestPluginCache', 'path' => TMP, 'prefix' => 'cake_test_'];
        $result = Cache::config('pluginLibEngine', $config);
        $engine = Cache::engine('pluginLibEngine');
        $this->assertInstanceOf('TestPlugin\Cache\Engine\TestPluginCacheEngine', $engine);

        Cache::drop('libEngine');
        Cache::drop('pluginLibEngine');

        Plugin::unload();
    }

    /**
     * Test write from a config that is undefined.
     *
     * @expectedException \InvalidArgumentException
     * @return void
     */
    public function testWriteNonExistingConfig()
    {
        $this->assertFalse(Cache::write('key', 'value', 'totally fake'));
    }

    /**
     * Test write from a config that is undefined.
     *
     * @expectedException \InvalidArgumentException
     * @return void
     */
    public function testIncrementNonExistingConfig()
    {
        $this->assertFalse(Cache::increment('key', 1, 'totally fake'));
    }

    /**
     * Test write from a config that is undefined.
     *
     * @expectedException \InvalidArgumentException
     * @return void
     */
    public function testDecrementNonExistingConfig()
    {
        $this->assertFalse(Cache::decrement('key', 1, 'totally fake'));
    }

    /**
     * Data provider for valid config data sets.
     *
     * @return array
     */
    public static function configProvider()
    {
        return [
            'Array of data using engine key.' => [[
                'engine' => 'File',
                'path' => TMP . 'tests',
                'prefix' => 'cake_test_'
            ]],
            'Array of data using classname key.' => [[
                'className' => 'File',
                'path' => TMP . 'tests',
                'prefix' => 'cake_test_'
            ]],
            'Direct instance' => [new FileEngine()],
        ];
    }

    /**
     * testConfig method
     *
     * @dataProvider configProvider
     * @return void
     */
    public function testConfigVariants($config)
    {
        $this->assertNotContains('test', Cache::configured(), 'test config should not exist.');
        Cache::config('tests', $config);

        $engine = Cache::engine('tests');
        $this->assertInstanceOf('Cake\Cache\Engine\FileEngine', $engine);
        $this->assertContains('tests', Cache::configured());
    }

    /**
     * testConfigInvalidEngine method
     *
     * @expectedException \BadMethodCallException
     * @return void
     */
    public function testConfigInvalidEngine()
    {
        $config = ['engine' => 'Imaginary'];
        Cache::config('test', $config);
        Cache::engine('test');
    }

    /**
     * test that trying to configure classes that don't extend CacheEngine fail.
     *
     * @expectedException \BadMethodCallException
     * @return void
     */
    public function testConfigInvalidObject()
    {
        $this->getMock('\StdClass', [], [], 'RubbishEngine');
        Cache::config('test', [
            'engine' => '\RubbishEngine'
        ]);
        Cache::engine('tests');
    }

    /**
     * Ensure you cannot reconfigure a cache adapter.
     *
     * @expectedException \BadMethodCallException
     * @return void
     */
    public function testConfigErrorOnReconfigure()
    {
        Cache::config('tests', ['engine' => 'File', 'path' => TMP]);
        Cache::config('tests', ['engine' => 'Apc']);
    }

    /**
     * Test reading configuration.
     *
     * @return void
     */
    public function testConfigRead()
    {
        $config = [
            'engine' => 'File',
            'path' => TMP,
            'prefix' => 'cake_'
        ];
        Cache::config('tests', $config);
        $expected = $config;
        $expected['className'] = $config['engine'];
        unset($expected['engine']);
        $this->assertEquals($expected, Cache::config('tests'));
    }

    /**
     * testGroupConfigs method
     */
    public function testGroupConfigs()
    {
        Cache::config('latest', [
            'duration' => 300,
            'engine' => 'File',
            'groups' => ['posts', 'comments'],
        ]);

        $expected = [
            'posts' => ['latest'],
            'comments' => ['latest'],
        ];
        $engine = Cache::engine('latest');
        $result = Cache::groupConfigs();
        $this->assertEquals($expected, $result);

        $result = Cache::groupConfigs('posts');
        $this->assertEquals(['posts' => ['latest']], $result);

        Cache::config('page', [
            'duration' => 86400,
            'engine' => 'File',
            'groups' => ['posts', 'archive'],
        ]);

        $engine = Cache::engine('page');
        $result = Cache::groupConfigs();
        $expected = [
            'posts' => ['latest', 'page'],
            'comments' => ['latest'],
            'archive' => ['page']
        ];
        $this->assertEquals($expected, $result);

        $result = Cache::groupConfigs('archive');
        $this->assertEquals(['archive' => ['page']], $result);

        Cache::config('archive', [
            'duration' => 86400 * 30,
            'engine' => 'File',
            'groups' => ['posts', 'archive', 'comments'],
        ]);

        $engine = Cache::engine('archive');
        $result = Cache::groupConfigs('archive');
        $this->assertEquals(['archive' => ['archive', 'page']], $result);
    }

    /**
     * testGroupConfigsThrowsException method
     * @expectedException \InvalidArgumentException
     */
    public function testGroupConfigsThrowsException()
    {
        Cache::groupConfigs('bogus');
    }

    /**
     * test that configured returns an array of the currently configured cache
     * config
     *
     * @return void
     */
    public function testConfigured()
    {
        Cache::drop('default');
        $result = Cache::configured();
        $this->assertContains('_cake_core_', $result);
        $this->assertNotContains('default', $result, 'Unconnected engines should not display.');
    }

    /**
     * test that drop removes cache configs, and that further attempts to use that config
     * do not work.
     *
     * @return void
     */
    public function testDrop()
    {
        Configure::write('App.namespace', 'TestApp');

        $result = Cache::drop('some_config_that_does_not_exist');
        $this->assertFalse($result, 'Drop should not succeed when config is missing.');

        Cache::config('unconfigTest', [
            'engine' => 'TestAppCache'
        ]);
        $this->assertInstanceOf(
            'TestApp\Cache\Engine\TestAppCacheEngine',
            Cache::engine('unconfigTest')
        );
        $this->assertTrue(Cache::drop('unconfigTest'));
    }

    /**
     * testWriteEmptyValues method
     *
     * @return void
     */
    public function testWriteEmptyValues()
    {
        $this->_configCache();
        Cache::write('App.falseTest', false, 'tests');
        $this->assertSame(Cache::read('App.falseTest', 'tests'), false);

        Cache::write('App.trueTest', true, 'tests');
        $this->assertSame(Cache::read('App.trueTest', 'tests'), true);

        Cache::write('App.nullTest', null, 'tests');
        $this->assertSame(Cache::read('App.nullTest', 'tests'), null);

        Cache::write('App.zeroTest', 0, 'tests');
        $this->assertSame(Cache::read('App.zeroTest', 'tests'), 0);

        Cache::write('App.zeroTest2', '0', 'tests');
        $this->assertSame(Cache::read('App.zeroTest2', 'tests'), '0');
    }

    /**
     * testWriteEmptyValues method
     *
     * @expectedException \InvalidArgumentException
     * @expectedExceptionMessage An empty value is not valid as a cache key
     * @return void
     */
    public function testWriteEmptyKey()
    {
        $this->_configCache();
        Cache::write(null, 'not null', 'tests');
    }

    /**
     * testReadWriteMany method
     *
     * @return void
     */
    public function testReadWriteMany()
    {
        $this->_configCache();
        $data = [
            'App.falseTest' => false,
            'App.trueTest' => true,
            'App.nullTest' => null,
            'App.zeroTest' => 0,
            'App.zeroTest2' => '0'
        ];
        Cache::writeMany($data, 'tests');

        $read = Cache::readMany(array_keys($data), 'tests');

        $this->assertSame($read['App.falseTest'], false);
        $this->assertSame($read['App.trueTest'], true);
        $this->assertSame($read['App.nullTest'], null);
        $this->assertSame($read['App.zeroTest'], 0);
        $this->assertSame($read['App.zeroTest2'], '0');
    }

    /**
     * testDeleteMany method
     *
     * @return void
     */
    public function testDeleteMany()
    {
        $this->_configCache();
        $data = [
            'App.falseTest' => false,
            'App.trueTest' => true,
            'App.nullTest' => null,
            'App.zeroTest' => 0,
            'App.zeroTest2' => '0'
        ];
        Cache::writeMany(array_merge($data, ['App.keepTest' => 'keepMe']), 'tests');

        Cache::deleteMany(array_keys($data), 'tests');
        $read = Cache::readMany(array_merge(array_keys($data), ['App.keepTest']), 'tests');

        $this->assertSame($read['App.falseTest'], false);
        $this->assertSame($read['App.trueTest'], false);
        $this->assertSame($read['App.nullTest'], false);
        $this->assertSame($read['App.zeroTest'], false);
        $this->assertSame($read['App.zeroTest2'], false);
        $this->assertSame($read['App.keepTest'], 'keepMe');
    }

    /**
     * Test that failed writes cause errors to be triggered.
     *
     * @expectedException \PHPUnit_Framework_Error
     * @return void
     */
    public function testWriteTriggerError()
    {
        Configure::write('App.namespace', 'TestApp');
        Cache::config('test_trigger', [
            'engine' => 'TestAppCache',
            'prefix' => ''
        ]);

        Cache::write('fail', 'value', 'test_trigger');
    }

    /**
     * testCacheDisable method
     *
     * Check that the "Cache.disable" configuration and a change to it
     * (even after a cache config has been setup) is taken into account.
     *
     * @return void
     */
    public function testCacheDisable()
    {
        Cache::enable();
        Cache::config('test_cache_disable_1', [
            'engine' => 'File',
            'path' => TMP . 'tests'
        ]);

        $this->assertTrue(Cache::write('key_1', 'hello', 'test_cache_disable_1'));
        $this->assertSame(Cache::read('key_1', 'test_cache_disable_1'), 'hello');

        Cache::disable();

        $this->assertNull(Cache::write('key_2', 'hello', 'test_cache_disable_1'));
        $this->assertFalse(Cache::read('key_2', 'test_cache_disable_1'));

        Cache::enable();

        $this->assertTrue(Cache::write('key_3', 'hello', 'test_cache_disable_1'));
        $this->assertSame('hello', Cache::read('key_3', 'test_cache_disable_1'));
        Cache::clear(false, 'test_cache_disable_1');

        Cache::disable();
        Cache::config('test_cache_disable_2', [
            'engine' => 'File',
            'path' => TMP . 'tests'
        ]);

        $this->assertNull(Cache::write('key_4', 'hello', 'test_cache_disable_2'));
        $this->assertFalse(Cache::read('key_4', 'test_cache_disable_2'));

        Cache::enable();

        $this->assertTrue(Cache::write('key_5', 'hello', 'test_cache_disable_2'));
        $this->assertSame(Cache::read('key_5', 'test_cache_disable_2'), 'hello');

        Cache::disable();
        $this->assertNull(Cache::write('key_6', 'hello', 'test_cache_disable_2'));
        $this->assertFalse(Cache::read('key_6', 'test_cache_disable_2'));

        Cache::enable();
        Cache::clear(false, 'test_cache_disable_2');
    }

    /**
     * Test toggling enabled state of cache.
     *
     * @return void
     */
    public function testEnableDisableEnabled()
    {
        $this->assertNull(Cache::enable());
        $this->assertTrue(Cache::enabled(), 'Should be on');
        $this->assertNull(Cache::disable());
        $this->assertFalse(Cache::enabled(), 'Should be off');
    }

    /**
     * test remember method.
     *
     * @return void
     */
    public function testRemember()
    {
        $this->_configCache();
        $counter = 0;
        $cacher = function () use ($counter) {
            return 'This is some data ' . $counter;
        };

        $expected = 'This is some data 0';
        $result = Cache::remember('test_key', $cacher, 'tests');
        $this->assertEquals($expected, $result);

        $counter = 1;
        $result = Cache::remember('test_key', $cacher, 'tests');
        $this->assertEquals($expected, $result);
    }
}