<?php
/**
 * FuzeWorks Async Library
 *
 * The FuzeWorks PHP FrameWork
 *
 * Copyright (C) 2013-2020 TechFuze
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * @author    TechFuze
 * @copyright Copyright (c) 2013 - 2020, TechFuze. (http://techfuze.net)
 * @license   https://opensource.org/licenses/MIT MIT License
 *
 * @link  http://techfuze.net/fuzeworks
 * @since Version 1.0.0
 *
 * @version Version 1.0.0
 */

use FuzeWorks\Async\Executors\ShellExecutor;
use FuzeWorks\Async\Task;
use FuzeWorks\Async\Tasks;
use FuzeWorks\Async\TasksException;
use FuzeWorks\Async\TaskStorage;
use PHPUnit\Framework\TestCase;

/**
 * Class ShellExecutorTest
 *
 * @coversDefaultClass \FuzeWorks\Async\Executors\ShellExecutor
 */
class ShellExecutorTest extends TestCase
{

    /**
     * @var ShellExecutor
     */
    private $executor;

    /**
     * @var TaskStorage
     */
    private $taskStorage;

    public function setUp(): void
    {
        // Load the TaskStorage so temporary tasks can be stored
        // Tasks shall NOT be reset between individual tests automatically
        $tasks = new Tasks();
        $this->taskStorage = $tasks->getTaskStorage();
        $this->taskStorage->reset();

        // And load the ShellExecutor using the execution settings
        $this->executor = new ShellExecutor([
            'bootstrapFile' => dirname(__DIR__) . DIRECTORY_SEPARATOR . 'bootstrap.php',
            'workerFile' => dirname(__DIR__, 2) . DIRECTORY_SEPARATOR . 'bin' . DIRECTORY_SEPARATOR . 'worker'
        ]);
    }

    public function testClass()
    {
        $this->assertInstanceOf('FuzeWorks\Async\Executors\ShellExecutor', $this->executor);
    }

    /**
     * @depends testClass
     */
    public function testNoWorkerFile()
    {
        $this->expectException(TasksException::class);
        new ShellExecutor(['bootstrapFile' => dirname(__DIR__) . DIRECTORY_SEPARATOR . 'bootstrap.php']);
    }

    /**
     * @depends testClass
     */
    public function testNoBoostrapFile()
    {
        $this->expectException(TasksException::class);
        new ShellExecutor(['workerFile' => dirname(__DIR__, 2) . DIRECTORY_SEPARATOR . 'bin' . DIRECTORY_SEPARATOR . 'worker']);
    }

    /**
     * @depends testClass
     */
    public function testInvalidWorkerFile()
    {
        $this->expectException(TasksException::class);
        new ShellExecutor([
            'bootstrapFile' => dirname(__DIR__) . DIRECTORY_SEPARATOR . 'bootstrap.php',
            'workerFile' => 'not_found'
        ]);
    }

    /**
     * @depends testClass
     */
    public function testInvalidBootstrapFile()
    {
        $this->expectException(TasksException::class);
        new ShellExecutor([
            'bootstrapFile' => 'not_found',
            'workerFile' => dirname(__DIR__, 2) . DIRECTORY_SEPARATOR . 'bin' . DIRECTORY_SEPARATOR . 'worker'
        ]);
    }

    /* ---------------------------------- Writing and reading tasks ----------------------- */

    /**
     * @depends testClass
     * @covers ::startTask
     * @covers ::getTaskRunning
     */
    public function testStartAndReadTasks()
    {
        // First we create a dummy task
        $dummyTask = new Task('testStartAndReadTasks', 'Mock\Handlers\TestStartAndReadTasksHandler');

        // Then we write this task to the TaskStorage
        $this->taskStorage->addTask($dummyTask);

        // Assert that no PID exists yet
        $this->assertNull($dummyTask->attribute('pid'));

        // Then we fire the task
        $task = $this->executor->startTask($dummyTask);

        // Pause 1/10th of a second
        usleep(100000);

        // Assert that the output is the same
        $this->assertSame($dummyTask, $task);

        // Also assert that a PID has been added
        $this->assertIsInt($task->attribute('pid'));

        // Also assert that the task is currently running
        $this->assertTrue($this->executor->getTaskRunning($task));
    }

    /**
     * @depends testStartAndReadTasks
     */
    public function testGetStats()
    {
        // First we create a dummy task, using the previous handler since nothing changes
        $dummyTask = new Task('testGetStats', 'Mock\Handlers\TestStartAndReadTasksHandler');

        // Then we write this task to the TaskStorage
        $this->taskStorage->addTask($dummyTask);

        // Then we start the task
        $dummyTask = $this->executor->startTask($dummyTask);

        // Pause 1/10th of a second
        usleep(100000);

        // And we fetch some task statistics
        $stats = $this->executor->getTaskStats($dummyTask);

        // Assert some assumptions
        $this->assertNotNull($stats);
        $this->assertIsInt($stats['pid']);
        $this->assertIsFloat($stats['cpu']);
        $this->assertIsFloat($stats['mem']);
        $this->assertIsString($stats['state']);
        $this->assertIsString($stats['start']);
    }

    /**
     * @depends testGetStats
     */
    public function testGetStatsNotExist()
    {
        // First we create a dummy task, using the previous handler since nothing changes
        $dummyTask = new Task('testGetStatsNotExist', 'none');

        // And add a fake PID, since otherwise it will immediately fail
        $dummyTask->addAttribute('pid', 1005);

        // Then we fetch the process details
        $this->assertNull($this->executor->getTaskStats($dummyTask));
    }

    /**
     * @depends testStartAndReadTasks
     */
    public function testStopTask()
    {
        // First we create a dummy task
        $dummyTask = new Task('testStopTask', 'Mock\Handlers\TestStopTaskHandler');

        // Then we write this task to the TaskStorage
        $this->taskStorage->addTask($dummyTask);

        // First we start the task and confirm its running
        $dummyTask = $this->executor->startTask($dummyTask);

        // Pause 1/10th of a second
        usleep(100000);

        // Check if the task is running
        $this->assertTrue($this->executor->getTaskRunning($dummyTask));

        // But then we try and stop it
        $output = $this->executor->stopTask($dummyTask);

        // Pause 1/10th of a second
        usleep(100000);

        // We check that the output actually is the task
        $this->assertSame($dummyTask, $output);

        // And check if the Task has actually stopped now
        $this->assertFalse($this->executor->getTaskRunning($dummyTask));
    }

}