<?php
/**
 * This source file is part of the open source project
 * ExpressionEngine (https://expressionengine.com)
 *
 * @link      https://expressionengine.com/
 * @copyright Copyright (c) 2003-2022, Packet Tide, LLC (https://www.packettide.com)
 * @license   https://expressionengine.com/license Licensed under Apache License, Version 2.0
 */

namespace ExpressionEngine\Service\Database;

use ExpressionEngine\Service\Config\ConfigWithDefaults;
use ExpressionEngine\Service\Config\File as ConfigFile;

/**
 * Database Config
 */
class DBConfig extends ConfigWithDefaults
{
    protected $delegate;
    protected $active_group;
    protected $defaults = array(
        'port' => 3306,
        'hostname' => '127.0.0.1',
        'username' => 'root',
        'password' => '',
        'database' => '',
        'dbdriver' => 'mysqli',
        'pconnect' => false,
        'dbprefix' => 'exp_',
        'swap_pre' => 'exp_',
        'db_debug' => true,
        'cache_on' => false,
        'autoinit' => false,
        'char_set' => 'utf8',
        'dbcollat' => 'utf8_unicode_ci',
        'cachedir' => '', // Set in constructor
    );

    /**
     * Create new Database Config object
     *
     * @param ConfigFile $config Config\File object
     */
    public function __construct(ConfigFile $config)
    {
        $this->delegate = $config;
        $this->active_group = $this->delegate->get(
            'database.active_group',
            'expressionengine'
        );

        $this->defaults['cachedir'] = rtrim(APPPATH, '/') . '/user/cache/db_cache/';
    }

    /**
     * Get an item from the database config, you can use
     * "expressionengine.hostname" to drill down in the config
     *
     * @param  string $item    The config item to get
     * @param  mixed  $default The value to return if $item can not be found
     * @return mixed           The value found for $item, otherwise $default
     */
    public function get($item = '', $default = null)
    {
        $default = $this->getDefaultFor($item, $default);

        $result = $this->delegate->get(
            rtrim("database.{$this->active_group}.{$item}", '.'),
            $default
        );

        if (is_array($result)) {
            return array_merge($default, $result);
        }

        return $result;
    }

    /**
     * Set the value of a database configuration item
     *
     * @param  string $item  The config item to set
     * @param  mixed  $value The new value of the config item
     * @return void
     */
    public function set($item, $value)
    {
        if ($value == $this->getDefaultFor($item)) {
            $value = null;
        }

        $this->delegate->set(
            "database.{$this->active_group}." . $item,
            $value
        );
    }

    /**
     * Get the active group's database configuration information for
     * CI_DB_driver
     *
     * @param  string $group Optionally pass in a group name to override
     *                       active_group
     *
     * @throws Exception If the $group specified or the active_group specified
     * in the config does not have related configuration details
     * @throws Exception If the $group specfiied or the active_group specified
     * in the config does not contain a username, hostname, and database
     *
     * @return array         The database configuration information consumable
     *                       directly by CI_DB_driver
     */
    public function getGroupConfig($group = '')
    {
        if (! empty($group)) {
            $this->active_group = $group;
        }

        $database_config = $this->get();

        if (empty($database_config)) {
            throw new \Exception('You have specified an invalid database connection group.');
        }

        // Check for required items
        $required = array('username', 'hostname', 'database');
        $missing = array();

        foreach ($required as $required_field) {
            if (empty($database_config[$required_field])) {
                $missing[] = $required_field;
            }
        }

        if (! empty($missing)) {
            throw new \Exception('You must define the following database parameters: ' . implode(', ', $missing));
        }

        return $database_config;
    }

    /**
     * Get the default values
     *
     * @return array Default values for config
     */
    public function getDefaults()
    {
        return $this->defaults;
    }

    /**
     * Get the name of the active group
     *
     * @return string Name of the active database group
     */
    public function getActiveGroup()
    {
        return $this->active_group;
    }
}

// EOF
