<?php

declare(strict_types=1);

namespace PHPUnit\Runner;

use function array_diff;
use function array_values;
use function basename;
use function class_exists;
use function get_declared_classes;
use function stripos;
use function strlen;
use function substr;
use PHPUnit\Framework\TestCase;
use ReflectionClass;
use ReflectionException;
use PHPUnit\Framework\WarningTestCase;

/**
 * Copyright (c) 2001-2021, Sebastian Bergmann <sebastian@phpunit.de>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 *  * Neither the name of Sebastian Bergmann nor the names of his
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

final class TestSuiteLoader
{
    /**
     * Loads the test suite.
     */
    public function load(string $suiteClassFile): ReflectionClass
    {
        $suiteClassName = basename($suiteClassFile, '.php');
        $loadedClasses  = get_declared_classes();

        if (!class_exists($suiteClassName, false)) {
            (static function () use ($suiteClassFile) {
                include_once $suiteClassFile;
            })();

            $loadedClasses = array_values(
                array_diff(get_declared_classes(), $loadedClasses)
            );

            if (empty($loadedClasses)) {
                return new ReflectionClass(WarningTestCase::class);
            }
        }

        if (!class_exists($suiteClassName, false)) {
            $offset = 0 - strlen($suiteClassName);

            foreach ($loadedClasses as $loadedClass) {

                if (stripos(substr($loadedClass, $offset - 1), '\\' . $suiteClassName) === 0) {
                    $suiteClassName = $loadedClass;

                    break;
                }
            }
        }

        if (!class_exists($suiteClassName, false)) {
            return new ReflectionClass(WarningTestCase::class);
        }

        try {
            $class = new ReflectionClass($suiteClassName);
        } catch (ReflectionException $e) {
            throw new Exception(
                $e->getMessage(),
                (int) $e->getCode(),
                $e
            );
        }

        if ($class->isSubclassOf(TestCase::class) && !$class->isAbstract()) {
            return $class;
        }

        if ($class->hasMethod('suite')) {
            try {
                $method = $class->getMethod('suite');
            } catch (ReflectionException $e) {
                throw new Exception(
                    $e->getMessage(),
                    (int) $e->getCode(),
                    $e
                );
            }

            if (!$method->isAbstract() && $method->isPublic() && $method->isStatic()) {
                return $class;
            }
        }

        return new ReflectionClass(WarningTestCase::class);
    }
}