class PhpHandler

final 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)) {
                $value = (string) constant($value);
            }
            ini_set($iniSetting->name(), $value);
        }
    }
    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 $variables) : void {
        foreach ($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 = $variable->force();
            if ($force || getenv($name) === false) {
                putenv("{$name}={$value}");
            }
            $value = getenv($name);
            if ($force || !isset($_ENV[$name])) {
                $_ENV[$name] = $value;
            }
        }
    }

}