<?php

namespace Illuminate\Foundation\Testing;

use Mockery;
use PHPUnit_Framework_TestCase;

abstract class TestCase extends PHPUnit_Framework_TestCase
{
    use Concerns\InteractsWithContainer,
        Concerns\MakesHttpRequests,
        Concerns\ImpersonatesUsers,
        Concerns\InteractsWithConsole,
        Concerns\InteractsWithDatabase,
        Concerns\InteractsWithSession,
        Concerns\MocksApplicationServices;

    /**
     * The Illuminate application instance.
     *
     * @var \Illuminate\Foundation\Application
     */
    protected $app;

    /**
     * The callbacks that should be run after the application is created.
     *
     * @var array
     */
    protected $afterApplicationCreatedCallbacks = [];

    /**
     * The callbacks that should be run before the application is destroyed.
     *
     * @var array
     */
    protected $beforeApplicationDestroyedCallbacks = [];

    /**
     * Indicates if we have made it throught the base setUp function.
     *
     * @var bool
     */
    protected $setUpHasRun = false;

    /**
     * Creates the application.
     *
     * Needs to be implemented by subclasses.
     *
     * @return \Symfony\Component\HttpKernel\HttpKernelInterface
     */
    abstract public function createApplication();

    /**
     * Setup the test environment.
     *
     * @return void
     */
    public function setUp()
    {
        if (! $this->app) {
            $this->refreshApplication();
        }

        $this->setUpTraits();

        foreach ($this->afterApplicationCreatedCallbacks as $callback) {
            call_user_func($callback);
        }

        $this->setUpHasRun = true;
    }

    /**
     * Refresh the application instance.
     *
     * @return void
     */
    protected function refreshApplication()
    {
        putenv('APP_ENV=testing');

        $this->app = $this->createApplication();
    }

    /**
     * Boot the testing helper traits.
     *
     * @return void
     */
    protected function setUpTraits()
    {
        $uses = array_flip(class_uses_recursive(get_class($this)));

        if (isset($uses[DatabaseTransactions::class])) {
            $this->beginDatabaseTransaction();
        }

        if (isset($uses[DatabaseMigrations::class])) {
            $this->runDatabaseMigrations();
        }

        if (isset($uses[WithoutMiddleware::class])) {
            $this->disableMiddlewareForAllTests();
        }

        if (isset($uses[WithoutEvents::class])) {
            $this->disableEventsForAllTests();
        }
    }

    /**
     * Clean up the testing environment before the next test.
     *
     * @return void
     */
    public function tearDown()
    {
        if (class_exists('Mockery')) {
            Mockery::close();
        }

        if ($this->app) {
            foreach ($this->beforeApplicationDestroyedCallbacks as $callback) {
                call_user_func($callback);
            }

            $this->app->flush();

            $this->app = null;
        }

        $this->setUpHasRun = false;

        if (property_exists($this, 'serverVariables')) {
            $this->serverVariables = [];
        }

        $this->afterApplicationCreatedCallbacks = [];
        $this->beforeApplicationDestroyedCallbacks = [];
    }

    /**
     * Register a callback to be run after the application is created.
     *
     * @param  callable  $callback
     * @return void
     */
    protected function afterApplicationCreated(callable $callback)
    {
        $this->afterApplicationCreatedCallbacks[] = $callback;

        if ($this->setUpHasRun) {
            call_user_func($callback);
        }
    }

    /**
     * Register a callback to be run before the application is destroyed.
     *
     * @param  callable  $callback
     * @return void
     */
    protected function beforeApplicationDestroyed(callable $callback)
    {
        $this->beforeApplicationDestroyedCallbacks[] = $callback;
    }
}
