<?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\Constraint\DependencyConstraint;
use FuzeWorks\Async\Handler;
use FuzeWorks\Async\Handler\DependentTaskHandler;
use FuzeWorks\Async\SuperVisor;
use FuzeWorks\Async\Task;
use FuzeWorks\Async\Tasks;
use FuzeWorks\Async\TaskStorage;
use FuzeWorks\Events;
use FuzeWorks\Factory;
use Mock\Handlers\ArgumentedHandler;
use Mock\Handlers\EmptyHandler;
use PHPUnit\Framework\TestCase;

class DependenciesTest extends TestCase
{

    /**
     * @var Tasks
     */
    private $tasks;

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

    public function setUp(): void
    {
        // Add TaskStorage
        /** @var Tasks $tasks */
        $this->tasks = Factory::getInstance('libraries')->get('async');
        $this->taskStorage = $this->tasks->getTaskStorage();
        $this->taskStorage->reset();

        // Reset events
        Events::$listeners = [];
    }

    /* ---------------------------------- Test the dependency constraint ------------------ */

    public function testHasConstrainedDeps()
    {
        // Create the dependent tasks
        $depTask1 = new Task('depTask1', new EmptyHandler());
        $depTask2 = new Task('depTask2', new EmptyHandler());

        // Write those dependencies to TaskStorage
        $this->taskStorage->addTask($depTask1);
        $this->taskStorage->addTask($depTask2);

        // Create the constraint
        $constraint = new DependencyConstraint(['depTask1', 'depTask2']);

        // And a dummyTask to accompany
        $dummyTask = new Task('dependentTask', new EmptyHandler());
        $dummyTask->addConstraint($constraint);

        // Test that the constraint is the same
        $this->assertSame([$constraint], $dummyTask->getConstraints());

        // And test the intervention
        $this->assertTrue($constraint->intervene($dummyTask));
        $this->assertEquals(Task::DELAYED, $constraint->blockCode());
        $this->assertEquals(time() + 3, $constraint->delayTime());
    }

    /**
     * @depends testHasConstrainedDeps
     */
    public function testDelayTimes()
    {
        // Create the dependent tasks
        $depTask1 = new Task('depTask1', new EmptyHandler());
        $depTask2 = new Task('depTask2', new EmptyHandler());

        // Write those dependencies to TaskStorage
        $this->taskStorage->addTask($depTask1);
        $this->taskStorage->addTask($depTask2);

        // Create some useless dummy task
        $dummyTask = new Task('dependentTask', new EmptyHandler());

        // Create the constraints
        // Default time
        $constraintDef = new DependencyConstraint(['depTask1', 'depTask2']);

        // Modified time (30)
        $constraintMod1 = new DependencyConstraint(['depTask1', 'depTask2'], 30);

        // And another (60)
        $constraintMod2 = new DependencyConstraint(['depTask1', 'depTask2'], 60);

        // And intervene all of them
        $this->assertTrue($constraintDef->intervene($dummyTask));
        $this->assertTrue($constraintMod1->intervene($dummyTask));
        $this->assertTrue($constraintMod2->intervene($dummyTask));

        // And check the results
        $this->assertEquals(Task::DELAYED, $constraintDef->blockCode());
        $this->assertEquals(Task::DELAYED, $constraintMod1->blockCode());
        $this->assertEquals(Task::DELAYED, $constraintMod2->blockCode());
        $this->assertEquals(time() + 3, $constraintDef->delayTime());
        $this->assertEquals(time() + 30, $constraintMod1->delayTime());
        $this->assertEquals(time() + 60, $constraintMod2->delayTime());
    }

    public function testHasFailedDeps()
    {
        // Create the dependent tasks
        $depTask1 = new Task('depTask1', new EmptyHandler());
        $depTask2 = new Task('depTask2', new EmptyHandler());

        // And set the first as completed, and second as failed
        $depTask1->setStatus(Task::COMPLETED);
        $depTask2->setStatus(Task::CANCELLED);

        // Write those dependencies to TaskStorage
        $this->taskStorage->addTask($depTask1);
        $this->taskStorage->addTask($depTask2);

        // Create the constraint
        $constraint = new DependencyConstraint(['depTask1', 'depTask2']);

        // And a dummyTask to accompany
        $dummyTask = new Task('dependentTask', new EmptyHandler());
        $dummyTask->addConstraint($constraint);

        // Test that the constraint is the same
        $this->assertSame([$constraint], $dummyTask->getConstraints());

        // And test the intervention
        $this->assertTrue($constraint->intervene($dummyTask));
        $this->assertEquals(Task::CANCELLED, $constraint->blockCode());
        $this->assertEquals('Task cancelled due to failed dependency.', $dummyTask->getErrors());
    }

    public function testHasCompletedDeps()
    {
        // Create the dependent tasks
        $depTask1 = new Task('depTask1', new EmptyHandler());
        $depTask2 = new Task('depTask2', new EmptyHandler());

        // And set the first as completed, and second as failed
        $depTask1->setStatus(Task::COMPLETED);
        $depTask2->setStatus(Task::COMPLETED);

        // Write those dependencies to TaskStorage
        $this->taskStorage->addTask($depTask1);
        $this->taskStorage->addTask($depTask2);

        // Create the constraint
        $constraint = new DependencyConstraint(['depTask1', 'depTask2']);

        // And a dummyTask to accompany
        $dummyTask = new Task('dependentTask', new EmptyHandler());
        $dummyTask->addConstraint($constraint);

        // Test that the constraint is the same
        $this->assertSame([$constraint], $dummyTask->getConstraints());

        // And test the intervention
        $this->assertFalse($constraint->intervene($dummyTask));
    }

    public function testGetDependencies()
    {
        $constraint = new DependencyConstraint(['someTask1', 'someTask2']);
        $this->assertEquals(['someTask1', 'someTask2'], $constraint->getDependencies());
    }

    /* ---------------------------------- Test the dependent task handler ----------------- */

    public function testAddedDependencies()
    {
        $handler = new DependentTaskHandler(['someTask1', 'someTask2']);
        $dummyTask = new Task('someTask', $handler);

        // Check that the constraints match expectations
        /** @var DependencyConstraint[] $constraints */
        $constraints = $dummyTask->getConstraints();
        $this->assertInstanceOf(DependencyConstraint::class, $constraints[0]);

        // And that the dependencies match
        $this->assertEquals(['someTask1', 'someTask2'], $constraints[0]->getDependencies());
    }

    public function testPassingOutput()
    {
        // Create the dependent tasks
        $depTask1 = new Task('someTask', new EmptyHandler());
        $depTask2 = new Task('someTask2', new EmptyHandler());

        // Give the dependencies some output
        $depTask1->setOutput('First Output', '');
        $depTask2->setOutput('Second Output', '');

        // Write those to TaskStorage
        $this->taskStorage->addTask($depTask1);
        $this->taskStorage->addTask($depTask2);

        // Create the task
        $handler = new DependentTaskHandler(['someTask', 'someTask2']);

        // Create a dummy Task
        $dummyTask = new Task('someTask3', $handler);

        // Assert that all is well
        $this->assertTrue($handler->primaryHandler($dummyTask));

        // And test the handler's output
        $this->assertEquals(json_encode([
            'someTask' => [
                'status' => Task::PENDING,
                'output' => 'First Output',
                'errors' => '',
                'post' => null,
                'postErrors' => null
            ],
            'someTask2' => [
                'status' => Task::PENDING,
                'output' => 'Second Output',
                'errors' => '',
                'post' => null,
                'postErrors' => null
            ]
        ]), $handler->getOutput());

        // And test the post handler
        $this->assertTrue($handler->postHandler($dummyTask));
        $this->assertEquals(json_encode([
            'someTask' => [
                'status' => Task::PENDING,
                'output' => 'First Output',
                'errors' => '',
                'post' => null,
                'postErrors' => null
            ],
            'someTask2' => [
                'status' => Task::PENDING,
                'output' => 'Second Output',
                'errors' => '',
                'post' => null,
                'postErrors' => null
            ]
        ]), $handler->getPostOutput());
    }

    /**
     * @depends testPassingOutput
     */
    public function testMissingDependency()
    {
        // Create the task
        $handler = new DependentTaskHandler(['someTask']);

        // Create a dummy Task
        $dummyTask = new Task('someTask2', $handler);

        // Assert that all is well
        $this->assertTrue($handler->primaryHandler($dummyTask));

        // And test the handler's output
        $this->assertEquals(json_encode([
            'someTask' => [
                'status' => Task::FAILED,
                'output' => null,
                'errors' => 'Task not found.',
                'post' => null,
                'postErrors' => null
            ],
        ]), $handler->getOutput());

        // And test the post handler
        $this->assertTrue($handler->postHandler($dummyTask));
        $this->assertEquals(json_encode([
            'someTask' => [
                'status' => Task::FAILED,
                'output' => null,
                'errors' => 'Task not found.',
                'post' => null,
                'postErrors' => null
            ],
        ]), $handler->getPostOutput());
    }

    /**
     * @depends testPassingOutput
     */
    public function testNoDepedencies()
    {
        // Create the task
        $handler = new DependentTaskHandler([]);

        // Create a dummy Task
        $dummyTask = new Task('someTask', $handler);

        // Assert that all is well
        $this->assertTrue($handler->primaryHandler($dummyTask));
        $this->assertEquals(json_encode([]), $handler->getOutput());

        // And test the post handler
        $this->assertTrue($handler->postHandler($dummyTask));
        $this->assertEquals(json_encode([]), $handler->getPostOutput());
    }

    public function testParentHandler()
    {
        // Test pass output
        $handler = new DependentTaskHandler([]);
        $handler->setParentInput('Passed Input');
        $this->assertEquals('Passed Input', $handler->getOutput());

        // Test passing a handler
        $handler = new DependentTaskHandler([]);
        $parentHandler = $this->createMock(Handler::class);
        $handler->setParentHandler($parentHandler);
        $this->assertSame($parentHandler, $handler->getParentHandler());
    }

    public function testPassDependencyOutput()
    {
        // Build all systems for this test
        $superVisor = $this->tasks->getSuperVisor();

        // Create the dependency
        $dependency = new Task('dependency', new ArgumentedHandler(0, 'Prepared Output'));

        // Write the task to TaskStorage
        $this->taskStorage->addTask($dependency);

        // Now create the dependent task
        $dependent = new Task('dependent', new DependentTaskHandler(['dependency'], 2));

        // And write that task to TaskStorage
        $this->taskStorage->addTask($dependent);

        // Now we make the SuperVisor cycle, to start the dependency and set the dependent to WAIT
        $this->assertEquals(SuperVisor::RUNNING, $superVisor->cycle());

        // Assert that everything is running
        $this->assertEquals(Task::RUNNING,
            $this->taskStorage->getTaskById($dependency->getId())->getStatus()
        );
        $this->assertEquals(Task::DELAYED,
            $this->taskStorage->getTaskById($dependent->getId())->getStatus()
        );

        // Give the task some time to finish
        usleep(500000);

        // And re-run the SuperVisor
        $this->assertEquals(SuperVisor::RUNNING, $superVisor->cycle());

        // Now check the tasks again. Dependency should be finished and have output,
        // whereas dependent should still be delayed
        $this->assertEquals(Task::SUCCESS,
            $this->taskStorage->getTaskById($dependency->getId())->getStatus()
        );
        $this->assertEquals(Task::DELAYED,
            $this->taskStorage->getTaskById($dependent->getId())->getStatus()
        );

        // Cycle again and see the dependency be completed, and dependent still delayed
        $this->assertEquals(SuperVisor::RUNNING, $superVisor->cycle());
        $this->assertEquals(Task::COMPLETED,
            $this->taskStorage->getTaskById($dependency->getId())->getStatus()
        );
        $this->assertEquals(Task::DELAYED,
            $this->taskStorage->getTaskById($dependent->getId())->getStatus()
        );

        // Also check that output is correct
        $this->assertEquals('Prepared Output',
            $this->taskStorage->getTaskById($dependency->getId())->getOutput()
        );

        // Now wait long enough for the delay to be finished
        usleep(2500000);

        // Now cycle again, and expect the task to be pending
        $this->assertEquals(SuperVisor::RUNNING, $superVisor->cycle());
        $this->assertEquals(Task::PENDING,
            $this->taskStorage->getTaskById($dependent->getId())->getStatus()
        );

        // Cycle again and expect it to be running
        $this->assertEquals(SuperVisor::RUNNING, $superVisor->cycle());
        $this->assertEquals(Task::RUNNING,
            $this->taskStorage->getTaskById($dependent->getId())->getStatus()
        );

        // Give the task some time to finish
        usleep(500000);

        // And cycle again and expect the task to have succeeded
        $this->assertEquals(SuperVisor::RUNNING, $superVisor->cycle());
        $this->assertEquals(Task::SUCCESS,
            $this->taskStorage->getTaskById($dependent->getId())->getStatus()
        );

        // Cycle again and expect the task to have completed, and test its output
        $this->assertEquals(SuperVisor::FINISHED, $superVisor->cycle());
        $this->assertEquals(Task::COMPLETED,
            $this->taskStorage->getTaskById($dependent->getId())->getStatus()
        );
        $this->assertEquals(
            json_encode(['dependency' => [
                'status' => Task::COMPLETED,
                'output' => 'Prepared Output',
                'errors' => '',
                'post' => null,
                'postErrors' => null
            ]]),
            $this->taskStorage->getTaskById($dependent->getId())->getOutput()
        );
    }
}