<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\TextUI\Configuration;

use const PATH_SEPARATOR;
use function constant;
use function define;
use function defined;
use function getenv;
use function implode;
use function ini_get;
use function ini_set;
use function is_array;
use function is_scalar;
use function putenv;
use function restore_error_handler;
use function set_error_handler;
use function sprintf;
use PHPUnit\Event\Facade as EventFacade;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 *
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final readonly class PhpHandler
{
    public function handle(Php $configuration): void
    {
        $this->handleIncludePaths($configuration->includePaths());
        $this->handleIniSettings($configuration->iniSettings());
        $this->handleConstants($configuration->constants());
        $this->handleGlobalVariables($configuration->globalVariables());
        $this->handleServerVariables($configuration->serverVariables());
        $this->handleEnvVariables($configuration->envVariables());
        $this->handleVariables('_POST', $configuration->postVariables());
        $this->handleVariables('_GET', $configuration->getVariables());
        $this->handleVariables('_COOKIE', $configuration->cookieVariables());
        $this->handleVariables('_FILES', $configuration->filesVariables());
        $this->handleVariables('_REQUEST', $configuration->requestVariables());
    }

    private function handleIncludePaths(DirectoryCollection $includePaths): void
    {
        if (!$includePaths->isEmpty()) {
            $includePathsAsStrings = [];

            foreach ($includePaths as $includePath) {
                $includePathsAsStrings[] = $includePath->path();
            }

            ini_set(
                'include_path',
                implode(PATH_SEPARATOR, $includePathsAsStrings) .
                PATH_SEPARATOR .
                ini_get('include_path'),
            );
        }
    }

    private function handleIniSettings(IniSettingCollection $iniSettings): void
    {
        foreach ($iniSettings as $iniSetting) {
            $value = $iniSetting->value();

            if (defined($value)) {
                $constantValue = constant($value);

                if (is_scalar($constantValue) || $constantValue === null) {
                    $value = (string) $constantValue;
                }
            }

            $error = '';

            set_error_handler(
                static function (int $errno, string $errstr, string $errfile, int $errline) use (&$error): true
                {
                    $error = $errstr;

                    return true;
                },
            );

            $success = ini_set($iniSetting->name(), $value);

            restore_error_handler();

            if ($success === false) {
                EventFacade::emitter()->testRunnerTriggeredPhpunitWarning(
                    sprintf(
                        'Failed to set "%s=%s": %s',
                        $iniSetting->name(),
                        $value,
                        $error,
                    ),
                );
            }
        }
    }

    private function handleConstants(ConstantCollection $constants): void
    {
        foreach ($constants as $constant) {
            if (!defined($constant->name())) {
                define($constant->name(), $constant->value());
            }
        }
    }

    private function handleGlobalVariables(VariableCollection $variables): void
    {
        foreach ($variables as $variable) {
            $GLOBALS[$variable->name()] = $variable->value();
        }
    }

    private function handleServerVariables(VariableCollection $variables): void
    {
        foreach ($variables as $variable) {
            $_SERVER[$variable->name()] = $variable->value();
        }
    }

    private function handleVariables(string $target, VariableCollection $variables): void
    {
        if (!isset($GLOBALS[$target]) || !is_array($GLOBALS[$target])) {
            $GLOBALS[$target] = [];
        }

        foreach ($variables as $variable) {
            $GLOBALS[$target][$variable->name()] = $variable->value();
        }
    }

    private function handleEnvVariables(VariableCollection $variables): void
    {
        foreach ($variables as $variable) {
            $name  = $variable->name();
            $value = $variable->value();
            $force = $variable->force();

            if (!is_scalar($value) && $value !== null) {
                continue;
            }

            $valueAsString = (string) $value;

            if ($force || getenv($name) === false) {
                putenv("{$name}={$valueAsString}");
            }

            $valueAsString = getenv($name);

            if ($force || !isset($_ENV[$name])) {
                $_ENV[$name] = $valueAsString;
            }
        }
    }
}
