<?php

class Configuration {
    private static $instance = null;

    /**
     * ! WARNING !
     *
     * Those are default values, if you need to change them for a particular host,
     * please just create a file named 'configuration.local.php' in the same directory
     * and redefine the values there !
     *
     * This file must contain an array named $configuration containing the keys you
     * want to redefine. Then, those values will be used to replace those in the
     * array defined just below.
     *
     * @var array configuration values
     */
    private $values = array(
        'db' => array(
            'driver' => 'SQL Server Native Client 11.0',
            'server' => 'BSR2012\SQLEXPRESS',
            'port' => '1433',
            'username' => 'alcoda',
            'password' => 'alcodaonly',
            'name' => 'NetBiblio3',
        ),
        'solr' => array(
            'server' => '192.168.1.250',
            'port' => '8983',
            'username' => '',
            'password' => '',
            'result_count' => 10,
        ),
        'log' => array(
            'file' => 'C:\inetpub\wwwroot\WebService\logs\log.txt',
            // The greater the verbosity, the more is displayed
            // 0 : no log at all
            // 1 : log function calls and errors
            // 2 : log parameters and sent data
            'verbosity' => 0,
        ),
        'session' => array(
            'save_path' => ''
        ),

        'checkfile_url' => 'http://fichiers.bibliothequesonore.ch/checkfile.php?',

        'netbiblio_worker_id' => 45,
        'www_employee_id' => 45,
        'www_library_id' => 2,
    );

    private $custom_config = 'configuration.local.php';

    private function __construct() {
        // by default, set the session save path to the default value;
        $this->values['session']['save_path'] = session_save_path();

        if(file_exists($this->custom_config)) {
            require_once($this->custom_config);

            if(! isset($configuration) || ! is_array($configuration)) {
                throw new RuntimeException("You custom configuration in '{$this->custom_config}' must be in a variable named '\$configuration' and be an array.");
            }

            $this->values = array_replace_recursive($this->values, $configuration);
        }
    }

    private function dotNotationAccess($data, $key, $default=null)
    {
        $keys = explode('.', $key);
        foreach ($keys as $k) {
            if (!is_array($data)) {
                throw new Exception("Try to access non-array as array, key '$key''");
            }
            if (!isset($data[$k])) {
                return $default;
            }

            $data = $data[$k];
        }
        return $data;
    }

    private function value($name, $default) {
        return $this->dotNotationAccess($this->values, $name, $default);
    }

    /**
     * @param $name
     * @param mixed $default the default value for your configuration option
     * @return mixed return the configuration value if the key is find, the default otherwise
     */
    public static function get($name, $default = null) {
        if(is_null(self::$instance)) {
            self::$instance = new Configuration();
        }

        return self::$instance->value($name, $default);
    }
}