/**
 * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

CKEDITOR.plugins.add( 'floatpanel', {
	requires: 'panel'
} );

( function() {
	var panels = {};

	function getPanel( editor, doc, parentElement, definition, level ) {
		// Generates the panel key: docId-eleId-skinName-langDir[-uiColor][-CSSs][-level]
		var key = CKEDITOR.tools.genKey( doc.getUniqueId(), parentElement.getUniqueId(), editor.lang.dir, editor.uiColor || '', definition.css || '', level || '' ),
			panel = panels[ key ];

		if ( !panel ) {
			panel = panels[ key ] = new CKEDITOR.ui.panel( doc, definition );
			panel.element = parentElement.append( CKEDITOR.dom.element.createFromHtml( panel.render( editor ), doc ) );

			panel.element.setStyles( {
				display: 'none',
				position: 'absolute'
			} );
		}

		return panel;
	}

	/**
	 * Represents a floating panel UI element.
	 *
	 * It is reused by rich combos, color combos, menus, etc.
	 * and it renders its content using {@link CKEDITOR.ui.panel}.
	 *
	 * @class
	 * @todo
	 */
	CKEDITOR.ui.floatPanel = CKEDITOR.tools.createClass( {
		/**
		 * Creates a floatPanel class instance.
		 *
		 * @constructor
		 * @param {CKEDITOR.editor} editor
		 * @param {CKEDITOR.dom.element} parentElement
		 * @param {Object} definition Definition of the panel that will be floating.
		 * @param {Number} level
		 */
		$: function( editor, parentElement, definition, level ) {
			definition.forceIFrame = 1;

			// In case of editor with floating toolbar append panels that should float
			// to the main UI element.
			if ( definition.toolbarRelated && editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE )
				parentElement = CKEDITOR.document.getById( 'cke_' + editor.name );

			var doc = parentElement.getDocument(),
				panel = getPanel( editor, doc, parentElement, definition, level || 0 ),
				element = panel.element,
				iframe = element.getFirst(),
				that = this;

			// Disable native browser menu. (https://dev.ckeditor.com/ticket/4825)
			element.disableContextMenu();

			this.element = element;

			this._ = {
				editor: editor,
				// The panel that will be floating.
				panel: panel,
				parentElement: parentElement,
				definition: definition,
				document: doc,
				iframe: iframe,
				children: [],
				dir: editor.lang.dir,
				showBlockParams: null
			};

			editor.on( 'mode', hide );
			editor.on( 'resize', hide );

			// When resize of the window is triggered floatpanel should be repositioned according to new dimensions.
			// https://dev.ckeditor.com/ticket/11724. Fixes issue with undesired panel hiding on Android and iOS.
			doc.getWindow().on( 'resize', function() {
				this.reposition();
			}, this );

			// We need a wrapper because events implementation doesn't allow to attach
			// one listener more than once for the same event on the same object.
			// Remember that floatPanel#hide is shared between all instances.
			function hide() {
				that.hide();
			}
		},

		proto: {
			/**
			 * @todo
			 */
			addBlock: function( name, block ) {
				return this._.panel.addBlock( name, block );
			},

			/**
			 * @todo
			 */
			addListBlock: function( name, multiSelect ) {
				return this._.panel.addListBlock( name, multiSelect );
			},

			/**
			 * @todo
			 */
			getBlock: function( name ) {
				return this._.panel.getBlock( name );
			},

			/**
			 * Shows the panel block.
			 *
			 * @param {String} name
			 * @param {CKEDITOR.dom.element} offsetParent Positioned parent.
			 * @param {Number} corner
			 *
			 * * For LTR (left to right) oriented editor:
			 *      * `1` = top-left
			 *      * `2` = top-right
			 *      * `3` = bottom-right
			 *      * `4` = bottom-left
			 * * For RTL (right to left):
			 *      * `1` = top-right
			 *      * `2` = top-left
			 *      * `3` = bottom-left
			 *      * `4` = bottom-right
			 *
			 * @param {Number} [offsetX=0]
			 * @param {Number} [offsetY=0]
			 * @param {Function} [callback] A callback function executed when block positioning is done.
			 * @todo what do exactly these params mean (especially corner)?
			 */
			showBlock: function( name, offsetParent, corner, offsetX, offsetY, callback ) {
				var panel = this._.panel,
					block = panel.showBlock( name );

				this._.showBlockParams = [].slice.call( arguments );
				this.allowBlur( false );

				// Record from where the focus is when open panel.
				var editable = this._.editor.editable();
				this._.returnFocus = editable.hasFocus ? editable : new CKEDITOR.dom.element( CKEDITOR.document.$.activeElement );
				this._.hideTimeout = 0;

				var element = this.element,
					iframe = this._.iframe,
					// Edge prefers iframe's window to the iframe, just like the rest of the browsers (https://dev.ckeditor.com/ticket/13143).
					focused = CKEDITOR.env.ie && !CKEDITOR.env.edge ? iframe : new CKEDITOR.dom.window( iframe.$.contentWindow ),
					doc = element.getDocument(),
					positionedAncestor = this._.parentElement.getPositionedAncestor(),
					position = offsetParent.getDocumentPosition( doc ),
					positionedAncestorPosition = positionedAncestor ? positionedAncestor.getDocumentPosition( doc ) : { x: 0, y: 0 },
					rtl = this._.dir == 'rtl',
					left = position.x + ( offsetX || 0 ) - positionedAncestorPosition.x,
					top = position.y + ( offsetY || 0 ) - positionedAncestorPosition.y;

				// Floating panels are off by (-1px, 0px) in RTL mode. (https://dev.ckeditor.com/ticket/3438)
				if ( rtl && ( corner == 1 || corner == 4 ) )
					left += offsetParent.$.offsetWidth;
				else if ( !rtl && ( corner == 2 || corner == 3 ) )
					left += offsetParent.$.offsetWidth - 1;

				if ( corner == 3 || corner == 4 )
					top += offsetParent.$.offsetHeight - 1;

				// Memorize offsetParent by it's ID.
				this._.panel._.offsetParentId = offsetParent.getId();

				element.setStyles( {
					top: top + 'px',
					left: 0,
					display: ''
				} );

				// Don't use display or visibility style because we need to
				// calculate the rendering layout later and focus the element.
				element.setOpacity( 0 );

				// To allow the context menu to decrease back their width
				element.getFirst().removeStyle( 'width' );

				// Report to focus manager.
				this._.editor.focusManager.add( focused );

				// Configure the IFrame blur event. Do that only once.
				if ( !this._.blurSet ) {

					// With addEventListener compatible browsers, we must
					// useCapture when registering the focus/blur events to
					// guarantee they will be firing in all situations. (https://dev.ckeditor.com/ticket/3068, https://dev.ckeditor.com/ticket/3222 )
					CKEDITOR.event.useCapture = true;

					focused.on( 'blur', function( ev ) {
						// As we are using capture to register the listener,
						// the blur event may get fired even when focusing
						// inside the window itself, so we must ensure the
						// target is out of it.
						if ( !this.allowBlur() || ev.data.getPhase() != CKEDITOR.EVENT_PHASE_AT_TARGET )
							return;

						if ( this.visible && !this._.activeChild ) {
							// [iOS] Allow hide to be prevented if touch is bound
							// to any parent of the iframe blur happens before touch (https://dev.ckeditor.com/ticket/10714).
							if ( CKEDITOR.env.iOS ) {
								if ( !this._.hideTimeout )
									this._.hideTimeout = CKEDITOR.tools.setTimeout( doHide, 0, this );
							} else {
								doHide.call( this );
							}
						}

						function doHide() {
							// Panel close is caused by user's navigating away the focus, e.g. click outside the panel.
							// DO NOT restore focus in this case.
							delete this._.returnFocus;
							this.hide();
						}
					}, this );

					focused.on( 'focus', function() {
						this._.focused = true;
						this.hideChild();
						this.allowBlur( true );
					}, this );

					// [iOS] if touch is bound to any parent of the iframe blur
					// happens twice before touchstart and before touchend (https://dev.ckeditor.com/ticket/10714).
					if ( CKEDITOR.env.iOS ) {
						// Prevent false hiding on blur.
						// We don't need to return focus here because touchend will fire anyway.
						// If user scrolls and pointer gets out of the panel area touchend will also fire.
						focused.on( 'touchstart', function() {
							clearTimeout( this._.hideTimeout );
						}, this );

						// Set focus back to handle blur and hide panel when needed.
						focused.on( 'touchend', function() {
							this._.hideTimeout = 0;
							this.focus();
						}, this );
					}

					CKEDITOR.event.useCapture = false;

					this._.blurSet = 1;
				}

				panel.onEscape = CKEDITOR.tools.bind( function( keystroke ) {
					if ( this.onEscape && this.onEscape( keystroke ) === false )
						return false;
				}, this );

				CKEDITOR.tools.setTimeout( function() {
					var panelLoad = CKEDITOR.tools.bind( function() {
						var target = element;

						// Reset panel width as the new content can be narrower
						// than the old one. (https://dev.ckeditor.com/ticket/9355)
						target.removeStyle( 'width' );

						if ( block.autoSize ) {
							var panelDoc = block.element.getDocument(),
								width = ( ( CKEDITOR.env.webkit || CKEDITOR.env.edge ) ? block.element : panelDoc.getBody() ).$.scrollWidth;

							// Account for extra height needed due to IE quirks box model bug:
							// http://en.wikipedia.org/wiki/Internet_Explorer_box_model_bug
							// (https://dev.ckeditor.com/ticket/3426)
							if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && width > 0 )
								width += ( target.$.offsetWidth || 0 ) - ( target.$.clientWidth || 0 ) + 3;

							// Add some extra pixels to improve the appearance.
							width += 10;

							target.setStyle( 'width', width + 'px' );

							var height = block.element.$.scrollHeight;

							// Account for extra height needed due to IE quirks box model bug:
							// http://en.wikipedia.org/wiki/Internet_Explorer_box_model_bug
							// (https://dev.ckeditor.com/ticket/3426)
							if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && height > 0 )
								height += ( target.$.offsetHeight || 0 ) - ( target.$.clientHeight || 0 ) + 3;

							target.setStyle( 'height', height + 'px' );

							// Fix IE < 8 visibility.
							panel._.currentBlock.element.setStyle( 'display', 'none' ).removeStyle( 'display' );
						} else {
							target.removeStyle( 'height' );
						}

						// Flip panel layout horizontally in RTL with known width.
						if ( rtl )
							left -= element.$.offsetWidth;

						// Pop the style now for measurement.
						element.setStyle( 'left', left + 'px' );

						/* panel layout smartly fit the viewport size. */
						var panelElement = panel.element,
							panelWindow = panelElement.getWindow(),
							rect = element.$.getBoundingClientRect(),
							viewportSize = panelWindow.getViewPaneSize();

						// Compensation for browsers that dont support "width" and "height".
						var rectWidth = rect.width || rect.right - rect.left,
							rectHeight = rect.height || rect.bottom - rect.top;

						// Check if default horizontal layout is impossible.
						var spaceAfter = rtl ? rect.right : viewportSize.width - rect.left,
							spaceBefore = rtl ? viewportSize.width - rect.right : rect.left;

						if ( rtl ) {
							if ( spaceAfter < rectWidth ) {
								// Flip to show on right.
								if ( spaceBefore > rectWidth )
									left += rectWidth;
								// Align to window left.
								else if ( viewportSize.width > rectWidth )
									left = left - rect.left;
								// Align to window right, never cutting the panel at right.
								else
									left = left - rect.right + viewportSize.width;
							}
						} else if ( spaceAfter < rectWidth ) {
							// Flip to show on left.
							if ( spaceBefore > rectWidth )
								left -= rectWidth;
							// Align to window right.
							else if ( viewportSize.width > rectWidth )
								left = left - rect.right + viewportSize.width;
							// Align to window left, never cutting the panel at left.
							else
								left = left - rect.left;
						}


						// Check if the default vertical layout is possible.
						var spaceBelow = viewportSize.height - rect.top,
							spaceAbove = rect.top;

						if ( spaceBelow < rectHeight ) {
							// Flip to show above.
							if ( spaceAbove > rectHeight )
								top -= rectHeight;
							// Align to window bottom.
							else if ( viewportSize.height > rectHeight )
								top = top - rect.bottom + viewportSize.height;
							// Align to top, never cutting the panel at top.
							else
								top = top - rect.top;
						}

						// If IE is in RTL, we have troubles with absolute
						// position and horizontal scrolls. Here we have a
						// series of hacks to workaround it. (https://dev.ckeditor.com/ticket/6146)
						if ( CKEDITOR.env.ie ) {
							var offsetParent = new CKEDITOR.dom.element( element.$.offsetParent ),
								scrollParent = offsetParent;

							// Quirks returns <body>, but standards returns <html>.
							if ( scrollParent.getName() == 'html' )
								scrollParent = scrollParent.getDocument().getBody();

							if ( scrollParent.getComputedStyle( 'direction' ) == 'rtl' ) {
								// For IE8, there is not much logic on this, but it works.
								if ( CKEDITOR.env.ie8Compat )
									left -= element.getDocument().getDocumentElement().$.scrollLeft * 2;
								else
									left -= ( offsetParent.$.scrollWidth - offsetParent.$.clientWidth );
							}
						}

						// Trigger the onHide event of the previously active panel to prevent
						// incorrect styles from being applied (https://dev.ckeditor.com/ticket/6170)
						var innerElement = element.getFirst(),
							activePanel;
						if ( ( activePanel = innerElement.getCustomData( 'activePanel' ) ) )
							activePanel.onHide && activePanel.onHide.call( this, 1 );
						innerElement.setCustomData( 'activePanel', this );

						element.setStyles( {
							top: top + 'px',
							left: left + 'px'
						} );
						element.setOpacity( 1 );

						callback && callback();
					}, this );

					panel.isLoaded ? panelLoad() : panel.onLoad = panelLoad;

					CKEDITOR.tools.setTimeout( function() {
						var scrollTop = CKEDITOR.env.webkit && CKEDITOR.document.getWindow().getScrollPosition().y;

						// Focus the panel frame first, so blur gets fired.
						this.focus();

						// Focus the block now.
						block.element.focus();

						// https://dev.ckeditor.com/ticket/10623, https://dev.ckeditor.com/ticket/10951 - restore the viewport's scroll position after focusing list element.
						if ( CKEDITOR.env.webkit )
							CKEDITOR.document.getBody().$.scrollTop = scrollTop;

						// We need this get fired manually because of unfired focus() function.
						this.allowBlur( true );

						// Ensure that the first item is focused (https://dev.ckeditor.com/ticket/16804).
						if ( CKEDITOR.env.ie ) {
							CKEDITOR.tools.setTimeout( function() {
								block.markFirstDisplayed ? block.markFirstDisplayed() : block._.markFirstDisplayed();
							}, 0 );
						} else {
							block.markFirstDisplayed ? block.markFirstDisplayed() : block._.markFirstDisplayed();
						}

						this._.editor.fire( 'panelShow', this );
					}, 0, this );
				}, CKEDITOR.env.air ? 200 : 0, this );
				this.visible = 1;

				if ( this.onShow )
					this.onShow.call( this );
			},

			/**
			 * Repositions the panel with the same parameters that were used in the last {@link #showBlock} call.
			 *
			 * @since 4.5.4
			 */
			reposition: function() {
				var blockParams = this._.showBlockParams;

				if ( this.visible && this._.showBlockParams ) {
					this.hide();
					this.showBlock.apply( this, blockParams );
				}
			},

			/**
			 * Restores the last focused element or simply focuses the panel window.
			 */
			focus: function() {
				// Webkit requires to blur any previous focused page element, in
				// order to properly fire the "focus" event.
				if ( CKEDITOR.env.webkit ) {
					var active = CKEDITOR.document.getActive();
					active && !active.equals( this._.iframe ) && active.$.blur();
				}

				// Restore last focused element or simply focus panel window.
				var focus = this._.lastFocused || this._.iframe.getFrameDocument().getWindow();
				focus.focus();
			},

			/**
			 * @todo
			 */
			blur: function() {
				var doc = this._.iframe.getFrameDocument(),
					active = doc.getActive();

				active && active.is( 'a' ) && ( this._.lastFocused = active );
			},

			/**
			 * Hides the panel.
			 *
			 * @todo
			 */
			hide: function( returnFocus ) {
				if ( this.visible && ( !this.onHide || this.onHide.call( this ) !== true ) ) {
					this.hideChild();
					// Blur previously focused element. (https://dev.ckeditor.com/ticket/6671)
					CKEDITOR.env.gecko && this._.iframe.getFrameDocument().$.activeElement.blur();
					this.element.setStyle( 'display', 'none' );
					this.visible = 0;
					this.element.getFirst().removeCustomData( 'activePanel' );

					// Return focus properly. (https://dev.ckeditor.com/ticket/6247)
					var focusReturn = returnFocus && this._.returnFocus;
					if ( focusReturn ) {
						// Webkit requires focus moved out panel iframe first.
						if ( CKEDITOR.env.webkit && focusReturn.type )
							focusReturn.getWindow().$.focus();

						focusReturn.focus();
					}

					delete this._.lastFocused;
					this._.showBlockParams = null;

					this._.editor.fire( 'panelHide', this );
				}
			},

			/**
			 * @todo
			 */
			allowBlur: function( allow ) {
				// Prevent editor from hiding the panel. (https://dev.ckeditor.com/ticket/3222)
				var panel = this._.panel;
				if ( allow !== undefined )
					panel.allowBlur = allow;

				return panel.allowBlur;
			},

			/**
			 * Shows the specified panel as a child of one block of this one.
			 *
			 * @param {CKEDITOR.ui.floatPanel} panel
			 * @param {String} blockName
			 * @param {CKEDITOR.dom.element} offsetParent Positioned parent.
			 * @param {Number} corner
			 *
			 * * For LTR (left to right) oriented editor:
			 *      * `1` = top-left
			 *      * `2` = top-right
			 *      * `3` = bottom-right
			 *      * `4` = bottom-left
			 * * For RTL (right to left):
			 *      * `1` = top-right
			 *      * `2` = top-left
			 *      * `3` = bottom-left
			 *      * `4` = bottom-right
			 *
			 * @param {Number} [offsetX=0]
			 * @param {Number} [offsetY=0]
			 * @todo
			 */
			showAsChild: function( panel, blockName, offsetParent, corner, offsetX, offsetY ) {
				// Skip reshowing of child which is already visible.
				if ( this._.activeChild == panel && panel._.panel._.offsetParentId == offsetParent.getId() )
					return;

				this.hideChild();

				panel.onHide = CKEDITOR.tools.bind( function() {
					// Use a timeout, so we give time for this menu to get
					// potentially focused.
					CKEDITOR.tools.setTimeout( function() {
						if ( !this._.focused )
							this.hide();
					}, 0, this );
				}, this );

				this._.activeChild = panel;
				this._.focused = false;

				panel.showBlock( blockName, offsetParent, corner, offsetX, offsetY );
				this.blur();

				/* https://dev.ckeditor.com/ticket/3767 IE: Second level menu may not have borders */
				if ( CKEDITOR.env.ie7Compat || CKEDITOR.env.ie6Compat ) {
					setTimeout( function() {
						panel.element.getChild( 0 ).$.style.cssText += '';
					}, 100 );
				}
			},

			/**
			 * @todo
			 */
			hideChild: function( restoreFocus ) {
				var activeChild = this._.activeChild;

				if ( activeChild ) {
					delete activeChild.onHide;
					delete this._.activeChild;
					activeChild.hide();

					// At this point focus should be moved back to parent panel.
					restoreFocus && this.focus();
				}
			}
		}
	} );

	CKEDITOR.on( 'instanceDestroyed', function() {
		var isLastInstance = CKEDITOR.tools.isEmpty( CKEDITOR.instances );

		for ( var i in panels ) {
			var panel = panels[ i ];
			// Safe to destroy it since there're no more instances.(https://dev.ckeditor.com/ticket/4241)
			if ( isLastInstance )
				panel.destroy();
			// Panel might be used by other instances, just hide them.(https://dev.ckeditor.com/ticket/4552)
			else
				panel.element.hide();
		}
		// Remove the registration.
		isLastInstance && ( panels = {} );

	} );
} )();
