<?php

namespace ProcessMaker\Util;

use Propel;

/**
 * Class Cnn
 * @package ProcessMaker\Util
 */
class Cnn
{
    private $DBFile;
    private $Workspace;

    /**
     * Establishes connection for the workspace
     * @param string $Workspace Name workspace
     */
    public static function connect($Workspace)
    {
        $cnn = new static();
        $cnn->Workspace = $Workspace;
        Propel::initConfiguration($cnn->buildParams());
    }

    /**
     * Loads the parameters required to connect to each workspace database
     * @return array
     */
    public function buildParams()
    {
        if ($this->readFileDBWorkspace()) {
            return $this->prepareDataSources();
        }
        return [];
    }

    /**
     * Reads the workspace db.php file
     * @return bool
     */
    private function readFileDBWorkspace()
    {
        if (file_exists(PATH_DB . $this->Workspace . PATH_SEP . 'db.php')) {
            $this->DBFile = file_get_contents(PATH_DB . $this->Workspace . PATH_SEP . 'db.php');
            return true;
        }
        return false;
    }

    /**
     * Prepares data resources
     * @return array
     */
    private function prepareDataSources()
    {
        $phpCode = preg_replace(
            '/define\s*\(\s*[\x22\x27](.*)[\x22\x27]\s*,\s*(\x22.*\x22|\x27.*\x27)\s*\)\s*;/i',
            '$$1 = $2;',
            $this->DBFile
        );
        $phpCode = str_replace(['<?php', '<?', '?>'], '', $phpCode);

        eval($phpCode);

        $dataSources = [];
        $dataSources['datasources'] = array(
            'workflow' => array(
                'connection' => $this->buildDsnString(
                    $DB_ADAPTER,
                    $DB_HOST,
                    $DB_NAME,
                    $DB_USER,
                    urlencode($DB_PASS)
                ),
                'adapter' => "mysql"
            ),
            'rbac' => array(
                'connection' => $this->buildDsnString(
                    $DB_ADAPTER,
                    $DB_RBAC_HOST,
                    $DB_RBAC_NAME,
                    $DB_RBAC_USER,
                    urlencode($DB_RBAC_PASS)
                ),
                'adapter' => "mysql"
            ),
            'report' => array(
                'connection' => $this->buildDsnString(
                    $DB_ADAPTER,
                    $DB_REPORT_HOST,
                    $DB_REPORT_NAME,
                    $DB_REPORT_USER,
                    urlencode($DB_REPORT_PASS)
                ),
                'adapter' => "mysql"
            )
        );
        return $dataSources;
    }

    /**
     * Builds the DSN string to be used by PROPEL
     * @param string $Adapter
     * @param string $Host
     * @param string $Name
     * @param string $User
     * @param string $Pass
     * @return string
     */
    private function buildDsnString($Adapter, $Host, $Name, $User, $Pass)
    {
        $Dsn = $Adapter . "://" . $User . ":" . $Pass . "@" . $Host . "/" . $Name;
        switch ($Adapter) {
            case 'mysql':
                $Dsn .= '?encoding=utf8';
                break;
        }
        return $Dsn;
    }
}