<?php
# -- BEGIN LICENSE BLOCK ---------------------------------------
#
# This file is part of Dotclear 2.
#
# Copyright (c) 2003-2013 Olivier Meunier & Association Dotclear
# Licensed under the GPL version 2.0 license.
# See LICENSE file or
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
#
# -- END LICENSE BLOCK -----------------------------------------
if (!defined('DC_RC_PATH')) { return; }

/**
@ingroup DC_CORE
@brief Blog namespace for settings handler

*/
class dcNamespace
{
	protected $con;		///< <b>connection</b> Database connection object
	protected $table;		///< <b>string</b> Settings table name
	protected $blog_id;		///< <b>string</b> Blog ID

	protected $global_settings = array();	///< <b>array</b> Global settings array
	protected $local_settings = array();	///< <b>array</b> Local settings array
	protected $settings = array();		///< <b>array</b> Associative settings array
	protected $ns;			///< <b>string</b> Current namespace

	/**
	Object constructor. Retrieves blog settings and puts them in $settings
	array. Local (blog) settings have a highest priority than global settings.

	@param	name		<b>string</b>		ID for this namespace
	*/
	public function __construct(&$core, $blog_id, $name, $rs=null)
	{
		if (preg_match('/^[a-zA-Z][a-zA-Z0-9]+$/',$name)) {
			$this->ns = $name;
		} else {
			throw new Exception(sprintf(__('Invalid setting dcNamespace: %s'),$name));
		}

		$this->con =& $core->con;
		$this->table = $core->prefix.'setting';
		$this->blog_id =& $blog_id;

		$this->getSettings($rs);
	}

	private function getSettings($rs=null)
	{
		if ($rs == null) {
			$strReq = 'SELECT blog_id, setting_id, setting_value, '.
					'setting_type, setting_label, setting_ns '.
					'FROM '.$this->table.' '.
					"WHERE (blog_id = '".$this->con->escape($this->blog_id)."' ".
					'OR blog_id IS NULL) '.
					"AND setting_ns = '".$this->con->escape($this->ns)."' ".
					'ORDER BY setting_id DESC ';

			try {
				$rs = $this->con->select($strReq);
			} catch (Exception $e) {
				trigger_error(__('Unable to retrieve settings:').' '.$this->con->error(), E_USER_ERROR);
			}
		}
		while ($rs->fetch())
		{
			if ($rs->f('setting_ns') != $this->ns){
				break;
			}
			$id = trim($rs->f('setting_id'));
			$value = $rs->f('setting_value');
			$type = $rs->f('setting_type');

			if ($type == 'float' || $type == 'double') {
				$type = 'float';
			} elseif ($type != 'boolean' && $type != 'integer') {
				$type = 'string';
			}

			settype($value,$type);

			$array = $rs->blog_id ? 'local' : 'global';

			$this->{$array.'_settings'}[$id] = array(
				'ns' => $this->ns,
				'value' => $value,
				'type' => $type,
				'label' => (string) $rs->f('setting_label'),
				'global' => $rs->blog_id == ''
			);
		}

		$this->settings = $this->global_settings;

		foreach ($this->local_settings as $id => $v) {
			$this->settings[$id] = $v;
		}

		return true;
	}

	private function settingExists($id,$global=false)
	{
		$array = $global ? 'global' : 'local';
		return isset($this->{$array.'_settings'}[$id]);
	}

	/**
	Returns setting value if exists.

	@param	n		<b>string</b>		Setting name
	@return	<b>mixed</b>
	*/
	public function get($n)
	{
		if (isset($this->settings[$n]['value'])) {
			return $this->settings[$n]['value'];
		}

		return null;
	}

	/**
	Magic __get method.
	@copydoc ::get
	*/
	public function __get($n)
	{
		return $this->get($n);
	}

	/**
	Sets a setting in $settings property. This sets the setting for script
	execution time only and if setting exists.

	@param	n		<b>string</b>		Setting name
	@param	v		<b>mixed</b>		Setting value
	*/
	public function set($n,$v)
	{
		if (isset($this->settings[$n])) {
			$this->settings[$n]['value'] = $v;
		}
	}

	/**
	Magic __set method.
	@copydoc ::set
	*/
	public function __set($n,$v)
	{
		$this->set($n,$v);
	}

	/**
	Creates or updates a setting.

	$type could be 'string', 'integer', 'float', 'boolean' or null. If $type is
	null and setting exists, it will keep current setting type.

	$value_change allow you to not change setting. Useful if you need to change
	a setting label or type and don't want to change its value.

	@param	id			<b>string</b>		Setting ID
	@param	value		<b>mixed</b>		Setting value
	@param	type			<b>string</b>		Setting type
	@param	label		<b>string</b>		Setting label
	@param	value_change	<b>boolean</b>		Change setting value or not
	@param	global		<b>boolean</b>		Setting is global
	*/
	public function put($id,$value,$type=null,$label=null,$value_change=true,$global=false)
	{
		if (!preg_match('/^[a-zA-Z][a-zA-Z0-9_]+$/',$id)) {
			throw new Exception(sprintf(__('%s is not a valid setting id'),$id));
		}

		# We don't want to change setting value
		if (!$value_change)
		{
			if (!$global && $this->settingExists($id,false)) {
				$value = $this->local_settings[$id]['value'];
			} elseif ($this->settingExists($id,true)) {
				$value = $this->global_settings[$id]['value'];
			}
		}

		# Setting type
		if ($type == 'double')
		{
			$type = 'float';
		}
		elseif ($type === null)
		{
			if (!$global && $this->settingExists($id,false)) {
				$type = $this->local_settings[$id]['type'];
			} elseif ($this->settingExists($id,true)) {
				$type = $this->global_settings[$id]['type'];
			} else {
				$type = 'string';
			}
		}
		elseif ($type != 'boolean' && $type != 'integer' && $type != 'float')
		{
			$type = 'string';
		}

		# We don't change label
		if ($label == null)
		{
			if (!$global && $this->settingExists($id,false)) {
				$label = $this->local_settings[$id]['label'];
			} elseif ($this->settingExists($id,true)) {
				$label = $this->global_settings[$id]['label'];
			}
		}

		settype($value,$type);

		$cur = $this->con->openCursor($this->table);
		$cur->setting_value = ($type == 'boolean') ? (string) (integer) $value : (string) $value;
		$cur->setting_type = $type;
		$cur->setting_label = $label;

		#If we are local, compare to global value
		if (!$global && $this->settingExists($id,true))
		{
			$g = $this->global_settings[$id];
			$same_setting = $g['ns'] == $this->ns && $g['value'] == $value
			&& $g['type'] == $type && $g['label'] == $label;

			# Drop setting if same value as global
			if ($same_setting && $this->settingExists($id,false)) {
				$this->drop($id);
			} elseif ($same_setting) {
				return;
			}
		}

		if ($this->settingExists($id,$global) && $this->ns == $this->settings[$id]['ns'])
		{
			if ($global) {
				$where = 'WHERE blog_id IS NULL ';
			} else {
				$where = "WHERE blog_id = '".$this->con->escape($this->blog_id)."' ";
			}

			$cur->update($where."AND setting_id = '".$this->con->escape($id)."' AND setting_ns = '".$this->con->escape($this->ns)."' ");
		}
		else
		{
			$cur->setting_id = $id;
			$cur->blog_id = $global ? null : $this->blog_id;
			$cur->setting_ns = $this->ns;

			$cur->insert();
		}
	}

	/**
	Rename an existing setting in a Namespace

	@param 	$oldId 	<b>string</b> 	Current setting name
	@param 	$newId 	<b>string</b> 	New setting name
	@return 	<b>boolean</b>
	*/
	public function rename($oldId,$newId)
	{
		if (!$this->ns) {
			throw new Exception(__('No namespace specified'));
		}

		if (!array_key_exists($oldId,$this->settings) || array_key_exists($newId,$this->settings)) {
			return false;
		}

		// Rename the setting in the settings array
		$this->settings[$newId] = $this->settings[$oldId];
		unset($this->settings[$oldId]);

		// Rename the setting in the database
		$strReq = 'UPDATE '.$this->table.
			" SET setting_id = '".$this->con->escape($newId)."' ".
			" WHERE setting_ns = '".$this->con->escape($this->ns)."' ".
			" AND setting_id = '".$this->con->escape($oldId)."' ";
		$this->con->execute($strReq);
		return true;
	}

	/**
	Removes an existing setting in a Namespace

	@param	id		<b>string</b>		Setting ID
	*/
	public function drop($id)
	{
		if (!$this->ns) {
			throw new Exception(__('No namespace specified'));
		}

		$strReq =	'DELETE FROM '.$this->table.' ';

		if ($this->blog_id === null) {
			$strReq .= 'WHERE blog_id IS NULL ';
		} else {
			$strReq .= "WHERE blog_id = '".$this->con->escape($this->blog_id)."' ";
		}

		$strReq .= "AND setting_id = '".$this->con->escape($id)."' ";
		$strReq .= "AND setting_ns = '".$this->con->escape($this->ns)."' ";

		$this->con->execute($strReq);
	}

	/**
	Removes all existing settings in a Namespace

	@param	force_global	<b>boolean</b>	Force global pref drop
	*/
	public function dropAll($force_global=false)
	{
		if (!$this->ns) {
			throw new Exception(__('No namespace specified'));
		}

		$strReq =	'DELETE FROM '.$this->table.' ';

		if (($force_global) || ($this->blog_id === null)) {
			$strReq .= 'WHERE blog_id IS NULL ';
			$global = true;
		} else {
			$strReq .= "WHERE blog_id = '".$this->con->escape($this->blog_id)."' ";
			$global = false;
		}

		$strReq .= "AND setting_ns = '".$this->con->escape($this->ns)."' ";

		$this->con->execute($strReq);

		$array = $global ? 'global' : 'local';
		unset($this->{$array.'_settings'});
		$this->{$array.'_settings'} = array();

		$array = $global ? 'local' : 'global';
		$this->settings = $this->{$array.'_settings'};
	}

	/**
	Returns $settings property content.

	@return	<b>array</b>
	*/
	public function dumpSettings()
	{
		return $this->settings;
	}

	/**
	Returns $global_settings property content.

	@return	<b>array</b>
	*/
	public function dumpGlobalSettings()
	{
		return $this->global_settings;
	}

}