<?php

class Requirement {

    /**
     * Check for the server requirements.
     *
     * @param array $requirements
     * @return array
     */
    public function checkRequirements()
    {
        // Server Requirements
        $requirements =  [
            // 'requirements' => [
                'php' => [
                    'openssl',
                    'pdo',
                    'mbstring',
                    'tokenizer',
                    'JSON',
                    'cURL',
                ],
                'apache' => [
                    'mod_rewrite',
                ]
            // ]
        ];

        $results = [];

        foreach($requirements as $type => $requirement)
        {
            switch ($type) {
                // check php requirements
                case 'php':
                    foreach($requirements[$type] as $requirement)
                    {
                        $results['requirements'][$type][$requirement] = true;

                        if(!extension_loaded($requirement))
                        {
                            $results['requirements'][$type][$requirement] = false;

                            $results['errors'] = true;
                        }
                    }
                    break;
                // check apache requirements
                case 'apache':
                    foreach ($requirements[$type] as $requirement) {
                        // if function doesn't exist we can't check apache modules
                        if(function_exists('apache_get_modules'))
                        {
                            $results['requirements'][$type][$requirement] = true;

                            if(!in_array($requirement,apache_get_modules()))
                            {
                                $results['requirements'][$type][$requirement] = false;

                                $results['errors'] = true;
                            }
                        }
                    }
                    break;
            }
        }

        return $results;
    }

    /**
     * Check PHP version requirement.
     *
     * @return array
     */
    public function checkPHPversion()
    {
        /**
         * Minimum PHP Version Supported (Override is in installer.php config file).
         *
         * @var _minPhpVersion
         */
        $_minPhpVersion = '7.0.0';

        $currentPhpVersion = $this->getPhpVersionInfo();
        $supported = false;

        if (version_compare($currentPhpVersion['version'], $_minPhpVersion) >= 0) {
            $supported = true;
        }

        $phpStatus = [
            'full' => $currentPhpVersion['full'],
            'current' => $currentPhpVersion['version'],
            'minimum' => $_minPhpVersion,
            'supported' => $supported
        ];

        return $phpStatus;
    }

    /**
     * Get current Php version information
     *
     * @return array
     */
    private static function getPhpVersionInfo()
    {
        $currentVersionFull = PHP_VERSION;
        preg_match("#^\d+(\.\d+)*#", $currentVersionFull, $filtered);
        $currentVersion = $filtered[0];

        return [
            'full' => $currentVersionFull,
            'version' => $currentVersion
        ];
    }

    /**
     * check installation for composer
     * @return boolean
    */
    private static function composerInstall()
    {
        putenv('COMPOSER_HOME=' . __DIR__ . '/vendor/bin/composer');
        $command = 'composer -v 2>&1';
        exec($command, $data['composer'], $data['composer_install']);

        return $data['composer_install'];
    }

    /**
     * check installation for composer
     * @return boolean
    */
    private static function nodeInstall()
    {
        $command = 'npm -v 2>&1';
        exec($command, $data['npm'], $data['npm_install']);

        return $data['npm_install'];
    }

    /**
     * Render view for class.
     *
     */
    public function render()
    {
        $requirements = $this->checkRequirements();

        $phpVersion = $this->checkPHPversion();

        $composerInstall = $this->composerInstall();

        $nodeInstall = $this->nodeInstall();

        ob_start();

        include __DIR__ . '/../Views/requirements.blade.php';

        return ob_get_clean();
    }
}