/*
Copyright (c) 2003-2009, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

/**
 * @fileOverview Defines the {@link CKEDITOR.env} object, which constains
 *		environment and browser information.
 */

if ( !CKEDITOR.env )
{
	/**
	 * Environment and browser information.
	 * @namespace
	 * @example
	 */
	CKEDITOR.env = (function()
	{
		var agent = navigator.userAgent.toLowerCase();
		var opera = window.opera;

		var env =
		/** @lends CKEDITOR.env */
		{
			/**
			 * Indicates that CKEditor is running on Internet Explorer.
			 * @type Boolean
			 * @example
			 * if ( CKEDITOR.env.ie )
			 *     alert( "I'm on IE!" );
			 */
			ie		: /*@cc_on!@*/false,

			/**
			 * Indicates that CKEditor is running on Opera.
			 * @type Boolean
			 * @example
			 * if ( CKEDITOR.env.opera )
			 *     alert( "I'm on Opera!" );
			 */
			opera	: ( !!opera && opera.version ),

			/**
			 * Indicates that CKEditor is running on a WebKit based browser, like
			 * Safari.
			 * @type Boolean
			 * @example
			 * if ( CKEDITOR.env.webkit )
			 *     alert( "I'm on WebKit!" );
			 */
			webkit	: ( agent.indexOf( ' applewebkit/' ) > -1 ),

			/**
			 * Indicates that CKEditor is running on Adobe AIR.
			 * @type Boolean
			 * @example
			 * if ( CKEDITOR.env.air )
			 *     alert( "I'm on AIR!" );
			 */
			air		: ( agent.indexOf( ' adobeair/' ) > -1 ),

			/**
			 * Indicates that CKEditor is running on Macintosh.
			 * @type Boolean
			 * @example
			 * if ( CKEDITOR.env.mac )
			 *     alert( "I love apples!" );
			 */
			mac	: ( agent.indexOf( 'macintosh' ) > -1 ),

			quirks : ( document.compatMode == 'BackCompat' ),

			isCustomDomain : function()
			{
				return this.ie && document.domain != window.location.hostname;
			}
		};

		/**
		 * Indicates that CKEditor is running on a Gecko based browser, like
		 * Firefox.
		 * @name CKEDITOR.env.gecko
		 * @type Boolean
		 * @example
		 * if ( CKEDITOR.env.gecko )
		 *     alert( "I'm riding a gecko!" );
		 */
		env.gecko = ( navigator.product == 'Gecko' && !env.webkit && !env.opera );

		var version = 0;

		// Internet Explorer 6.0+
		if ( env.ie )
		{
			version = parseFloat( agent.match( /msie (\d+)/ )[1] );

			/**
			 *  Indicate IE8 browser.
			 */
			env.ie8 = !!document.documentMode;

			/**
			 * Indicte IE8 document mode.
			 */
			env.ie8Compat = document.documentMode == 8;

			/**
			 * Indicates that CKEditor is running on an IE7-like environment, which
			 * includes IE7 itself and IE8's IE7 document mode.
			 * @type Boolean
			 */
			env.ie7Compat = ( ( version == 7 && !document.documentMode )
					|| document.documentMode == 7 );

			/**
			 * Indicates that CKEditor is running on an IE6-like environment, which
			 * includes IE6 itself and IE7 and IE8 quirks mode.
			 * @type Boolean
			 * @example
			 * if ( CKEDITOR.env.ie6Compat )
			 *     alert( "I'm on IE6 or quirks mode!" );
			 */
			env.ie6Compat = ( version < 7 || env.quirks );

		}

		// Gecko.
		if ( env.gecko )
		{
			var geckoRelease = agent.match( /rv:([\d\.]+)/ );
			if ( geckoRelease )
			{
				geckoRelease = geckoRelease[1].split( '.' );
				version = geckoRelease[0] * 10000 + ( geckoRelease[1] || 0 ) * 100 + ( geckoRelease[2] || 0 ) * 1;
			}
		}

		// Opera 9.50+
		if ( env.opera )
			version = parseFloat( opera.version() );

		// Adobe AIR 1.0+
		// Checked before Safari because AIR have the WebKit rich text editor
		// features from Safari 3.0.4, but the version reported is 420.
		if ( env.air )
			version = parseFloat( agent.match( / adobeair\/(\d+)/ )[1] );

		// WebKit 522+ (Safari 3+)
		if ( env.webkit )
			version = parseFloat( agent.match( / applewebkit\/(\d+)/ )[1] );

		/**
		 * Contains the browser version.
		 *
		 * For gecko based browsers (like Firefox) it contains the revision
		 * number with first three parts concatenated with a padding zero
		 * (e.g. for revision 1.9.0.2 we have 10900).
		 *
		 * For webkit based browser (like Safari and Chrome) it contains the
		 * WebKit build version (e.g. 522).
		 * @name CKEDITOR.env.version
		 * @type Boolean
		 * @example
		 * if ( CKEDITOR.env.ie && <b>CKEDITOR.env.version</b> <= 6 )
		 *     alert( "Ouch!" );
		 */
		env.version = version;

		/**
		 * Indicates that CKEditor is running on a compatible browser.
		 * @name CKEDITOR.env.isCompatible
		 * @type Boolean
		 * @example
		 * if ( CKEDITOR.env.isCompatible )
		 *     alert( "Your browser is pretty cool!" );
		 */
		env.isCompatible =
			( env.ie && version >= 6 ) ||
			( env.gecko && version >= 10801 ) ||
			( env.opera && version >= 9.5 ) ||
			( env.air && version >= 1 ) ||
			( env.webkit && version >= 522 ) ||
			false;

		// The CSS class to be appended on the main UI containers, making it
		// easy to apply browser specific styles to it.
		env.cssClass =
			'cke_browser_' + (
				env.ie ? 'ie' :
				env.gecko ? 'gecko' :
				env.opera ? 'opera' :
				env.air ? 'air' :
				env.webkit ? 'webkit' :
				'unknown' );

		if ( env.quirks )
			env.cssClass += ' cke_browser_quirks';

		if ( env.ie )
		{
			env.cssClass += ' cke_browser_ie' + (
				env.version < 7 ? '6' :
				env.version >= 8 ? '8' :
				'7' );

			if ( env.quirks )
				env.cssClass += ' cke_browser_iequirks';
		}

		if ( env.gecko && version < 10900 )
			env.cssClass += ' cke_browser_gecko18';

		return env;
	})();
}

// PACKAGER_RENAME( CKEDITOR.env )
// PACKAGER_RENAME( CKEDITOR.env.ie )