<?php

/**
 * Sitewide configuration.
 *
 * @property string Title Title of the website.
 * @property string Tagline Tagline of the website.
 * @property string Theme Current theme.
 * @property string CanViewType Type of restriction used for view permissions.
 * @property string CanEditType Type of restriction used for edit permissions.
 * @property string CanCreateTopLevelType Type of restriction used for creation of root-level pages.
 *
 * @method ManyManyList ViewerGroups() List of groups that can view SiteConfig.
 * @method ManyManyList EditorGroups() List of groups that can edit SiteConfig.
 * @method ManyManyList CreateTopLevelGroups() List of groups that can create root-level pages.
 *
 * @author Tom Rix
 * @package cms
 */
class SiteConfig extends DataObject implements PermissionProvider, TemplateGlobalProvider {
	private static $db = array(
		"Title" => "Varchar(255)",
		"Tagline" => "Varchar(255)",
		"Theme" => "Varchar(255)",
		"CanViewType" => "Enum('Anyone, LoggedInUsers, OnlyTheseUsers', 'Anyone')",
		"CanEditType" => "Enum('LoggedInUsers, OnlyTheseUsers', 'LoggedInUsers')",
		"CanCreateTopLevelType" => "Enum('LoggedInUsers, OnlyTheseUsers', 'LoggedInUsers')",
	);
	
	private static $many_many = array(
		"ViewerGroups" => "Group",
		"EditorGroups" => "Group",
		"CreateTopLevelGroups" => "Group"
	);

	private static $defaults = array(
		"CanViewType" => "Anyone",
		"CanEditType" => "LoggedInUsers",
		"CanCreateTopLevelType" => "LoggedInUsers",
	);
	
	/**
	 * @config
	 * @var array
	 */
	private static $disabled_themes = array();

	/**
	 * Default permission to check for 'LoggedInUsers' to create or edit pages
	 *
	 * @var array
	 * @config
	 */
	private static $required_permission = array('CMS_ACCESS_CMSMain', 'CMS_ACCESS_LeftAndMain');
	
	/**
	 * @deprecated 3.2 Use the "SiteConfig.disabled_themes" config setting instead
	 */
	static public function disable_theme($theme) {
		Deprecation::notice('3.2', 'Use the "SiteConfig.disabled_themes" config setting instead');
		Config::inst()->update('SiteConfig', 'disabled_themes', array($theme));
	}

	public function populateDefaults()
	{
		$this->Title = _t('SiteConfig.SITENAMEDEFAULT', "Your Site Name");
		$this->Tagline = _t('SiteConfig.TAGLINEDEFAULT', "your tagline here");
		
		// Allow these defaults to be overridden
		parent::populateDefaults();
	}

	/**
	 * Get the fields that are sent to the CMS. In
	 * your extensions: updateCMSFields($fields)
	 *
	 * @return FieldList
	 */
	public function getCMSFields() {

		$groupsMap = array();
		foreach(Group::get() as $group) {
			// Listboxfield values are escaped, use ASCII char instead of &raquo;
			$groupsMap[$group->ID] = $group->getBreadcrumbs(' > ');
		}
		asort($groupsMap);

		$fields = new FieldList(
			new TabSet("Root",
				$tabMain = new Tab('Main',
					$titleField = new TextField("Title", _t('SiteConfig.SITETITLE', "Site title")),
					$taglineField = new TextField("Tagline", _t('SiteConfig.SITETAGLINE', "Site Tagline/Slogan")),
					$themeDropdownField = new DropdownField("Theme", _t('SiteConfig.THEME', 'Theme'), $this->getAvailableThemes())
				),
				$tabAccess = new Tab('Access',
					$viewersOptionsField = new OptionsetField("CanViewType", _t('SiteConfig.VIEWHEADER', "Who can view pages on this site?")),
					$viewerGroupsField = ListboxField::create("ViewerGroups", _t('SiteTree.VIEWERGROUPS', "Viewer Groups"))
						->setMultiple(true)
						->setSource($groupsMap)
						->setAttribute(
							'data-placeholder', 
							_t('SiteTree.GroupPlaceholder', 'Click to select group')
						),
					$editorsOptionsField = new OptionsetField("CanEditType", _t('SiteConfig.EDITHEADER', "Who can edit pages on this site?")),
					$editorGroupsField = ListboxField::create("EditorGroups", _t('SiteTree.EDITORGROUPS', "Editor Groups"))
						->setMultiple(true)
						->setSource($groupsMap)
						->setAttribute(
							'data-placeholder', 
							_t('SiteTree.GroupPlaceholder', 'Click to select group')
						),
					$topLevelCreatorsOptionsField = new OptionsetField("CanCreateTopLevelType", _t('SiteConfig.TOPLEVELCREATE', "Who can create pages in the root of the site?")),
					$topLevelCreatorsGroupsField = ListboxField::create("CreateTopLevelGroups", _t('SiteTree.TOPLEVELCREATORGROUPS', "Top level creators"))
						->setMultiple(true)
						->setSource($groupsMap)
						->setAttribute(
							'data-placeholder', 
							_t('SiteTree.GroupPlaceholder', 'Click to select group')
						)
				)
			),
			new HiddenField('ID')
		);

		$themeDropdownField->setEmptyString(_t('SiteConfig.DEFAULTTHEME', '(Use default theme)'));

		$viewersOptionsSource = array();
		$viewersOptionsSource["Anyone"] = _t('SiteTree.ACCESSANYONE', "Anyone");
		$viewersOptionsSource["LoggedInUsers"] = _t('SiteTree.ACCESSLOGGEDIN', "Logged-in users");
		$viewersOptionsSource["OnlyTheseUsers"] = _t('SiteTree.ACCESSONLYTHESE', "Only these people (choose from list)");
		$viewersOptionsField->setSource($viewersOptionsSource);
		
		$editorsOptionsSource = array();
		$editorsOptionsSource["LoggedInUsers"] = _t('SiteTree.EDITANYONE', "Anyone who can log-in to the CMS");
		$editorsOptionsSource["OnlyTheseUsers"] = _t('SiteTree.EDITONLYTHESE', "Only these people (choose from list)");
		$editorsOptionsField->setSource($editorsOptionsSource);
		
		$topLevelCreatorsOptionsField->setSource($editorsOptionsSource);
		
		if (!Permission::check('EDIT_SITECONFIG')) {
			$fields->makeFieldReadonly($viewersOptionsField);
			$fields->makeFieldReadonly($viewerGroupsField);
			$fields->makeFieldReadonly($editorsOptionsField);
			$fields->makeFieldReadonly($editorGroupsField);
			$fields->makeFieldReadonly($topLevelCreatorsOptionsField);
			$fields->makeFieldReadonly($topLevelCreatorsGroupsField);
			$fields->makeFieldReadonly($taglineField);
			$fields->makeFieldReadonly($titleField);
		}

		if(file_exists(BASE_PATH . '/install.php')) {
			$fields->addFieldToTab("Root.Main", new LiteralField("InstallWarningHeader", 
				"<p class=\"message warning\">" . _t("SiteTree.REMOVE_INSTALL_WARNING", 
				"Warning: You should remove install.php from this SilverStripe install for security reasons.")
				. "</p>"), "Title");
		}
		
		$tabMain->setTitle(_t('SiteConfig.TABMAIN', "Main"));
		$tabAccess->setTitle(_t('SiteConfig.TABACCESS', "Access"));
		$this->extend('updateCMSFields', $fields);
		
		return $fields;
	}

	/**
	 * Get all available themes that haven't been marked as disabled.
	 * @param string $baseDir Optional alternative theme base directory for testing
	 * @return array of theme directory names
	 */
	public function getAvailableThemes($baseDir = null) {
		$themes = SSViewer::get_themes($baseDir);
		$disabled = (array)$this->config()->disabled_themes;
		foreach($disabled as $theme) {
			if(isset($themes[$theme])) unset($themes[$theme]);
		}
		return $themes;
	}
	
	/**
	 * Get the actions that are sent to the CMS. In
	 * your extensions: updateEditFormActions($actions)
	 *
	 * @return Fieldset
	 */
	public function getCMSActions() {
		if (Permission::check('ADMIN') || Permission::check('EDIT_SITECONFIG')) {
			$actions = new FieldList(
				FormAction::create('save_siteconfig', _t('CMSMain.SAVE','Save'))
					->addExtraClass('ss-ui-action-constructive')->setAttribute('data-icon', 'accept')
			);
		} else {
			$actions = new FieldList();
		}
		
		$this->extend('updateCMSActions', $actions);
		
		return $actions;
	}

	/**
	 * @return String
	 */
	public function CMSEditLink() {
		return singleton('CMSSettingsController')->Link();
	}
	
	/**
	 * Get the current sites SiteConfig, and creates a new one
	 * through {@link make_site_config()} if none is found.
	 *
	 * @return SiteConfig
	 */
	static public function current_site_config() {
		if ($siteConfig = DataObject::get_one('SiteConfig')) return $siteConfig;
		
		return self::make_site_config();
	}

	/**
	 * Setup a default SiteConfig record if none exists
	 */
	public function requireDefaultRecords() {
		parent::requireDefaultRecords();
		$siteConfig = DataObject::get_one('SiteConfig');
		if(!$siteConfig) {
			self::make_site_config();
			DB::alteration_message("Added default site config","created");
		}
	}
	
	/**
	 * Create SiteConfig with defaults from language file.
	 * 
	 * @return SiteConfig
	 */
	static public function make_site_config() {
		$config = SiteConfig::create();
		$config->write();
		return $config;
	}

	/**
	 * Can a user view this SiteConfig instance?
	 *
	 * @param Member $member
	 * @return boolean
	 */
	public function canView($member = null) {
		if(!$member) $member = Member::currentUserID();
 		if($member && is_numeric($member)) $member = DataObject::get_by_id('Member', $member);

		$extended = $this->extendedCan('canView', $member);
		if($extended !== null) return $extended;

		// Assuming all that can edit this object can also view it
		return $this->canEdit($member);
	}

	/**
	 * Can a user view pages on this site? This method is only
	 * called if a page is set to Inherit, but there is nothing
	 * to inherit from.
	 *
	 * @param Member $member
	 * @return boolean
	 */
	public function canViewPages($member = null) {
		if(!$member) $member = Member::currentUserID();
		if($member && is_numeric($member)) $member = DataObject::get_by_id('Member', $member);

		if ($member && Permission::checkMember($member, "ADMIN")) return true;

		$extended = $this->extendedCan('canViewPages', $member);
		if($extended !== null) return $extended;

		if (!$this->CanViewType || $this->CanViewType == 'Anyone') return true;
				
		// check for any logged-in users
		if($this->CanViewType === 'LoggedInUsers' && $member) return true;

		// check for specific groups
		if($this->CanViewType === 'OnlyTheseUsers' && $member && $member->inGroups($this->ViewerGroups())) return true;
		
		return false;
	}

	/**
	 * Can a user edit pages on this site? This method is only
	 * called if a page is set to Inherit, but there is nothing
	 * to inherit from, or on new records without a parent.
	 *
	 * @param Member $member
	 * @return boolean
	 */
	public function canEditPages($member = null) {
		if(!$member) $member = Member::currentUserID();
		if($member && is_numeric($member)) $member = DataObject::get_by_id('Member', $member);

		if ($member && Permission::checkMember($member, "ADMIN")) return true;

		$extended = $this->extendedCan('canEditPages', $member);
		if($extended !== null) return $extended;

		// check for any logged-in users with CMS access
		if( $this->CanEditType === 'LoggedInUsers'
			&& Permission::checkMember($member, $this->config()->required_permission)
		) {
			return true;
		}

		// check for specific groups
		if($this->CanEditType === 'OnlyTheseUsers' && $member && $member->inGroups($this->EditorGroups())) {
			return true;
		}
		
		return false;
	}

	public function canEdit($member = null) {
		if(!$member) $member = Member::currentUserID();
		if($member && is_numeric($member)) $member = DataObject::get_by_id('Member', $member);

		$extended = $this->extendedCan('canEdit', $member);
		if($extended !== null) return $extended;

		return Permission::checkMember($member, "EDIT_SITECONFIG");
	}
	
	public function providePermissions() {
		return array(
			'EDIT_SITECONFIG' => array(
				'name' => _t('SiteConfig.EDIT_PERMISSION', 'Manage site configuration'),
				'category' => _t('Permissions.PERMISSIONS_CATEGORY', 'Roles and access permissions'),
				'help' => _t('SiteConfig.EDIT_PERMISSION_HELP', 'Ability to edit global access settings/top-level page permissions.'),
				'sort' => 400
			)
		);
	}
	
	/**
	 * Can a user create pages in the root of this site?
	 *
	 * @param Member $member
	 * @return boolean
	 */
	public function canCreateTopLevel($member = null) {
		if(!$member) $member = Member::currentUserID();
		if($member && is_numeric($member)) $member = DataObject::get_by_id('Member', $member);

		if ($member && Permission::checkMember($member, "ADMIN")) return true;

		$extended = $this->extendedCan('canCreateTopLevel', $member);
		if($extended !== null) return $extended;
		
		// check for any logged-in users with CMS permission
		if( $this->CanCreateTopLevelType === 'LoggedInUsers'
			&& Permission::checkMember($member, $this->config()->required_permission)
		) {
			return true;
		}
		
		// check for specific groups
		if( $this->CanCreateTopLevelType === 'OnlyTheseUsers'
			&& $member
			&& $member->inGroups($this->CreateTopLevelGroups())
		) {
			return true;
		}

		return false;
	}

	/**
	 * Add $SiteConfig to all SSViewers
	 */
	public static function get_template_global_variables() {
		return array(
			'SiteConfig' => 'current_site_config',
		);
	}
	
}