/**
 * @file Configuration helper plugin for CKEditor
 * Copyright (C) 2012 Alfonso Martínez de Lizarrondo
 *
 */
/* global CKEDITOR */
(function() {
	'use strict';

	// Check if the browser supports the placeholder attribute on textareas natively.
	var supportsPlaceholder = 'placeholder' in document.createElement( 'textarea' );

	// If the data is "empty" (BR, P) or the placeholder then return an empty string.
	// Otherwise return the original data
	function dataIsEmpty( data ) {
		if ( !data)
			return true;

		if ( data.length > 20 )
			return false;

		var value = data.replace( /[\n|\t]*/g, '' ).toLowerCase();
		if ( !value || value == '<br>' || value == '<p>&nbsp;<br></p>' || value == '<p><br></p>' || value == '<div><br></div>' || value == '<p>&nbsp;</p>' || value == '&nbsp;' || value == ' ' || value == '&nbsp;<br>' || value == ' <br>' )
			return true;

		return false;
	}

	function addPlaceholder(ev) {
		var editor = ev.editor;

		// do not add placeholder in readOnly mode
		if (editor.readOnly)
			return;

		var root = editor.editable();
		var placeholder = ev.listenerData;
		if (!root)
			return;

		if (editor.mode == 'wysiwyg') {
			// If the blur is due to a dialog, don't apply the placeholder
			if ( CKEDITOR.dialog._.currentTop )
				return;

			if ( !root )
				return;

			if ( dataIsEmpty( root.getHtml() ) ) {
				root.setHtml( placeholder );
				root.addClass( 'placeholder' );
			}
		}

		if (editor.mode == 'source') {
			if ( supportsPlaceholder ) {
				if (ev.name == 'mode') {
					root.setAttribute( 'placeholder', placeholder );
				}
				return;
			}

			if ( dataIsEmpty( root.getValue() ) ) {
				root.setValue( placeholder );
				root.addClass( 'placeholder' );
			}
		}
	}

	function removePlaceholder(ev) {
		var editor = ev.editor;
		var root = editor.editable();
		if (!root)
			return;

		if (editor.mode == 'wysiwyg' ) {
			if (!root.hasClass( 'placeholder' ))
				return;

			root.removeClass( 'placeholder' );
			// fill it properly
			if (CKEDITOR.dtd[ root.getName() ]['p']) {
				var value = '';
				if ( editor.enterMode === CKEDITOR.ENTER_P ) {
					value = '<p><br/></p>';
				} else if (editor.enterMode === CKEDITOR.ENTER_DIV) {
					value = '<div><br/><\/div>';
				} else {
					// This is for CKEDITOR.ENTER_BR
					value = '<br/>';
					// FireFox prepends an additional line
					if (CKEDITOR.env.gecko || CKEDITOR.env.ie) {
						value = ' ';
					}
				}
				root.setHtml(value);
				// Set caret in position
				var range = new CKEDITOR.dom.range(editor.document);
				range.moveToElementEditablePosition(root.getFirst(), true);
				editor.getSelection().selectRanges([ range ]);
			} else {
				root.setHtml(' ');
			}
		}

		if (editor.mode == 'source') {
			if ( !root.hasClass( 'placeholder' ) )
				return;

			root.removeClass( 'placeholder' );
			root.setValue( '' );
		}
	}

	function handleReadOnlyChange(ev) {
		var editor = ev.editor;
		if (editor.readOnly) {
			removePlaceholder(ev);
		} else {
			addPlaceholder(ev);
		}
	}

	function getLang( element ) {
		if (!element)
			return null;

		return element.getAttribute( 'lang' ) || getLang( element.getParent() );
	}

	CKEDITOR.plugins.add( 'confighelper', {
		getPlaceholderCss : function() {
			return '.placeholder{ color: #999; }';
		},

		onLoad : function() {
			CKEDITOR.addCss( this.getPlaceholderCss() );
		},

		init : function( editor ) {

			// correct focus status after switch mode
			editor.on( 'mode', function( ev ) {
				// Let's update to match reality
				ev.editor.focusManager.hasFocus = false;
				// Now focus it:
			});

			// Placeholder - Start
			// Get the placeholder from the replaced element or from the configuration
			var placeholder = editor.element.getAttribute( 'placeholder' ) || editor.config.placeholder;

			if (placeholder) {
				// CSS for textarea mode
				var node = CKEDITOR.document.getHead().append( 'style' );
				node.setAttribute( 'type', 'text/css' );
				var content = 'textarea.placeholder { color: #999; font-style: italic; }';

				if ( CKEDITOR.env.ie && CKEDITOR.env.version < 11)
					node.$.styleSheet.cssText = content;
				else
					node.$.innerHTML = content;

				// Watch for the calls to getData to remove the placeholder
				editor.on( 'getData', function( ev ) {
					var element = editor.editable();

					if ( element && element.hasClass( 'placeholder' ) )
						ev.data.dataValue = '';
				});

				// Watch for setData to remove placeholder class
				editor.on('setData', function(ev) {
					if ( CKEDITOR.dialog._.currentTop )
						return;

					if ( editor.mode == 'source' && supportsPlaceholder )
						return;

					var root = editor.editable();

					if ( !root )
						return;

					if ( !dataIsEmpty( ev.data.dataValue ) ) {
						// Remove the class if new data is not empty
						if ( root.hasClass( 'placeholder' ) )
							root.removeClass( 'placeholder' );
					} else {
						// if data is empty, set it to the placeholder
						addPlaceholder(ev);
					}
				});

				editor.on('blur', addPlaceholder, null, placeholder);
				editor.on('mode', addPlaceholder, null, placeholder);
				editor.on('contentDom', addPlaceholder, null, placeholder);

				editor.on('focus', removePlaceholder);
				editor.on('key', removePlaceholder);
				editor.on('beforeModeUnload', removePlaceholder);

				editor.on('readOnly', handleReadOnlyChange, null, placeholder);
			} // Placeholder - End


			// SCAYT lang from element lang:
			var lang = editor.config.contentsLanguage || getLang( editor.element );
			if ( lang && editor.plugins.scayt && !editor.config.scayt_sLang ) {
				try {
					// Remove the stored language
					if (localStorage)
						localStorage.removeItem( 'scayt_0_lang' );
				} catch (e) { /* */}

				// Convert from HTML5 Lang to spellchecker.net values
				var map = {
					'en'   : 'en_US',
					'en-us': 'en_US',
					'en-gb': 'en_GB',
					'pt-br': 'pt_BR',
					'da'   : 'da_DK',
					'da-dk': 'da_DK',
					'nl-nl': 'nl_NL',
					'en-ca': 'en_CA',
					'fi-fi': 'fi_FI',
					'fr'   : 'fr_FR',
					'fr-fr': 'fr_FR',
					'fr-ca': 'fr_CA',
					'de'   : 'de_DE',
					'de-de': 'de_DE',
					'el-gr': 'el_GR',
					'it'   : 'it_IT',
					'it-it': 'it_IT',
					'nb-no': 'nb_NO',
					'pt'   : 'pt_PT',
					'pt-pt': 'pt_PT',
					'es'   : 'es_ES',
					'es-es': 'es_ES',
					'sv-se': 'sv_SE'
				};
				editor.config.scayt_sLang = map[ lang.toLowerCase() ];
			}

			// Parse the config to turn it into a js object
			// format= dialogName:tabName:fieldName
			var parseDefinitionToObject = function( value ) {
				// Allow JSON definitions
				if (typeof value == 'object')
					return value;

				var contents = value.split( ';' ),
					tabsToProcess = {},
					i;

				for ( i = 0; i < contents.length; i++ ) {
					var parts = contents[ i ].split( ':' );
					if ( parts.length == 3 ) {
						var dialogName = parts[ 0 ],
							tabName = parts[ 1 ],
							fieldName = parts[ 2 ];

						if ( !tabsToProcess[ dialogName ] )
							tabsToProcess[ dialogName ] = {};
						if ( !tabsToProcess[ dialogName ][ tabName ] )
							tabsToProcess[ dialogName ][ tabName ] = [];

						tabsToProcess[ dialogName ][ tabName ].push( fieldName );
					}
				}
				return tabsToProcess;
			};

			// Customize dialogs:
			function customizeDialogs( ev ) {
				if ( editor != ev.editor )
					return;

				var dialogName = ev.data.name,
					dialogDefinition = ev.data.definition,
					tabsToProcess,
					i, name, fields, tab;

				if (dialogName == 'tableProperties')
					dialogName = 'table';

				// Parse the config to turn it into a js object
				if ( !( 'removeDialogFields' in editor._ ) && editor.config.removeDialogFields )
					editor._.removeDialogFields = parseDefinitionToObject( editor.config.removeDialogFields );

				// Remove fields of this dialog.
				if ( editor._.removeDialogFields && ( tabsToProcess = editor._.removeDialogFields[ dialogName ] ) ) {
					for ( name in tabsToProcess ) {
						fields = tabsToProcess[ name ];
						tab = dialogDefinition.getContents( name );
						if (!tab)
							continue;

						for ( i = 0; i < fields.length ; i++ )
							tab.remove( fields[ i ] );
					}
				}


				if ( !( 'hideDialogFields' in editor._ ) && editor.config.hideDialogFields )
					editor._.hideDialogFields = parseDefinitionToObject( editor.config.hideDialogFields );

				// Remove fields of this dialog.
				if ( editor._.hideDialogFields && ( tabsToProcess = editor._.hideDialogFields[ dialogName ] ) ) {
					for ( name in tabsToProcess ) {
						fields = tabsToProcess[ name ];
						tab = dialogDefinition.getContents( name );
						if (!tab)
							continue;

						for ( i = 0; i < fields.length ; i++ )
							tab.get( fields[ i ] ).hidden = true;
					}
				}

				// Set default values.
				if ( editor.config.dialogFieldsDefaultValues && ( tabsToProcess = editor.config.dialogFieldsDefaultValues[ dialogName ] ) ) {
					for ( name in tabsToProcess ) {
						fields = tabsToProcess[ name ];
						tab = dialogDefinition.getContents( name );
						if (!tab)
							continue;

						for ( var fieldName in fields ) {
							var dialogField = tab.get( fieldName );
							if ( dialogField )
								dialogField[ 'default' ] = fields[ fieldName ];
						}
					}
				}


			}

			CKEDITOR.on( 'dialogDefinition', customizeDialogs );
			editor.once( 'beforeDestroy', function() {
				CKEDITOR.removeListener( 'dialogDefinition', customizeDialogs );
			});

		}
	} );

})();

 /**
  * Allows to define which dialog fiels must be removed
  * @name CKEDITOR.config.removeDialogFields
  * @type {String}
  * @example
  *	editor.config.removeDialogFields = "image:info:txtBorder;image:info:txtHSpace";
  */

 /**
  * Allows to define which dialog fiels must be hidden
  * @name CKEDITOR.config.hideDialogFields
  * @type {String}
  * @example
  *	editor.config.hideDialogFields = "image:info:htmlPreview";
  */

 /**
  * Allows to define default values for dialog fields
  * @name CKEDITOR.config.dialogFieldsDefaultValues
  * @type {Object}
  * @example
	config.dialogFieldsDefaultValues =
	{
		image:
			{
				advanced:
					{
						txtGenClass : 'myClass',
						txtGenTitle : 'Image title'
					}
			}
	};
  */


 /**
  * Placeholder text for empty editor
  * @name CKEDITOR.config.placeholder
  * @type {String}
  * @example
  *	editor.config.placeholder = "Please, type here...";
  */
