/**
 * EGroupware eTemplate2 - Class which contains a factory method for rows
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package etemplate
 * @subpackage api
 * @link https://www.egroupware.org
 * @author Andreas Stöckel
 * @copyright EGroupware GmbH 2011-2021
 */

/*egw:uses
	/vendor/bower-asset/jquery/dist/jquery.js;
	et2_core_inheritance;
	et2_core_interfaces;
	et2_core_arrayMgr;
	et2_core_widget;
	et2_dataview_view_rowProvider;
*/

import {et2_widget} from "./et2_core_widget";
import {et2_arrayMgrs_expand} from "./et2_core_arrayMgr";
import {et2_dataview_grid} from "./et2_dataview_view_grid";
import {egw} from "../jsapi/egw_global";
import {et2_IDetachedDOM, et2_IDOMNode} from "./et2_core_interfaces";

/**
 * The row provider contains prototypes (full clonable dom-trees)
 * for all registered row types.
 *
 */
export class et2_nextmatch_rowProvider
{
	private _rowProvider : any;
	private _subgridCallback : any;
	private _context : any;
	private _rootWidget : any;
	private _template : any;
	private _dataRow : any;

	/**
	 * Creates the nextmatch row provider.
	 *
	 * @param {et2_nextmatch_rowProvider} _rowProvider
	 * @param {function} _subgridCallback
	 * @param {object} _context
	 * @memberOf et2_nextmatch_rowProvider
	 */
	constructor(_rowProvider, _subgridCallback, _context)
	{


		// Copy the arguments
		this._rowProvider = _rowProvider;
		this._subgridCallback = _subgridCallback;
		this._context = _context;

		this._createEmptyPrototype();
	}

	destroy()
	{
		this._rowProvider.destroy();
		this._subgridCallback = null;
		this._context = null;
		this._dataRow = null;
	}

	/**
	 * Creates the data row prototype.
	 *
	 * @param _widgets is an array containing the root widget for each column.
	 * @param _rowData contains the properties of the root "tr" (like its class)
	 * @param _rootWidget is the parent widget of the data rows (i.e.
	 * the nextmatch)
	 */
	setDataRowTemplate(_widgets, _rowData, _rootWidget)
	{
		// Copy the root widget
		this._rootWidget = _rootWidget;

		// Create the base row
		var row = this._rowProvider.getPrototype("default");

		// Copy the row template
		var rowTemplate = {
			"row": row[0],
			"rowData": _rowData,
			"widgets": _widgets,
			"root": _rootWidget,
			"seperated": null,
			"mgrs": _rootWidget.getArrayMgrs()
		};

		// Create the row widget and insert the given widgets into the row
		var rowWidget = new et2_nextmatch_rowWidget(rowTemplate.mgrs, row[0]);
		rowWidget._parent = _rootWidget;
		rowWidget.createWidgets(_widgets);

		// Get the set containing all variable attributes
		var variableAttributes = this._getVariableAttributeSet(rowWidget);

		// Filter out all widgets which do not implement the et2_IDetachedDOM
		// interface or do not support all attributes listed in the et2_IDetachedDOM
		// interface. A warning is issued for all those widgets as they heavily
		// degrade the performance of the dataview
		var seperated = rowTemplate.seperated =
			this._seperateWidgets(variableAttributes);

		// Remove all DOM-Nodes of all widgets inside the "remaining" slot from
		// the row-template, then build the access functions for the detachable
		// widgets
		this._stripTemplateRow(rowTemplate);
		this._buildNodeAccessFuncs(rowTemplate);

		// Create the DOM row template
		var tmpl = document.createDocumentFragment();
		row.children().each(function() { tmpl.appendChild(this); });

		this._dataRow = tmpl;
		this._template = rowTemplate;
	}

	getDataRow(_data : any, _row, _idx, _controller)
	{

		// Clone the row template
		var row = this._dataRow.cloneNode(true);

		// Create array managers with the given data merged in
		var mgrs = et2_arrayMgrs_expand(rowWidget, this._template.mgrs,
			_data, _idx);

		// Insert the widgets into the row which do not provide the functions
		// to set the _data directly
		var rowWidget : et2_nextmatch_rowTemplateWidget = null;
		if(this._template.seperated.remaining.length > 0)
		{
			// Transform the variable attributes
			for(var i = 0; i < this._template.seperated.remaining.length; i++)
			{
				var entry = this._template.seperated.remaining[i];

				for(var j = 0; j < entry.data.length; j++)
				{
					var set = entry.data[j];
					if(typeof entry.widget.options != "undefined")
					{
						entry.widget.options[set.attribute] = mgrs["content"].expandName(set.expression);
					}
					else if(entry.widget.getAttributeNames().indexOf(set.attribute) >= 0)
					{
						entry.widget.setAttribute(set.attribute, mgrs["content"].expandName(set.expression));
					}
				}
			}

			// Create the row widget
			var rowWidget = new et2_nextmatch_rowTemplateWidget(this._rootWidget,
				row);

			// Let the row widget create the widgets
			rowWidget.createWidgets(mgrs, this._template.placeholders);
		}

		// Update the content of all other widgets
		for(var i = 0; i < this._template.seperated.detachable.length; i++)
		{
			var entry = this._template.seperated.detachable[i];
			let widget = entry.widget;

			// Parse the attribute expressions
			let data : any = {};
			let attributes = entry.data.map(attr => attr.attribute);
			for(var j = 0; j < entry.data.length; j++)
			{
				var set = entry.data[j];
				data[set.attribute] = mgrs["content"].expandName(set.expression);
			}
			// WebComponent IS the node, and we've already cloned it
			if(typeof window.customElements.get(widget.localName) != "undefined")
			{
				widget = this._cloneWebComponent(entry, row, data);
				if(!widget)
				{
					console.warn("Error cloning ", entry);
					continue;
				}
			}
			else
			{
				// Retrieve all DOM-Nodes (legacy widgets)
				var nodes = new Array(entry.nodeFuncs.length);
				for(var j = 0; j < nodes.length; j++)
				{
					// Use the previously compiled node function to get the node
					// from the entry
					try
					{
						nodes[j] = entry.nodeFuncs[j](row);
					}
					catch(e)
					{
						debugger;
						continue;
					}
				}
			}

			// Set the array managers first
			widget.setArrayMgrs(mgrs);
			if(typeof data.id != "undefined")
			{
				widget.id = data.id;
			}

			// Adjust data for that row
			widget.transformAttributes?.call(widget, data);

			// Make sure to only send detached attributes, filter out any deferredProperties
			let filtered = widget.deferredProperties ? Object.keys(data)
				.filter(key => attributes.includes(key))
				.reduce((obj, key) =>
				{
					obj[key] = data[key];
					return obj
				}, {}) : data;

			// Call the setDetachedAttributes function
			widget.setDetachedAttributes(nodes, filtered, _data);
		}

		// Insert the row into the tr
		var tr = _row.getDOMNode();
		tr.appendChild(row);

		// Make the row expandable
		if(typeof _data.content["is_parent"] !== "undefined"
			&& _data.content["is_parent"])
		{
			_row.makeExpandable(true, function()
			{
				return this._subgridCallback.call(this._context,
					_row, _data, _controller);
			}, this);

			// Check for kept expansion, and set the row up to be re-expanded
			// Only the top controller tracks expanded, including sub-grids
			var top_controller = _controller;
			while(top_controller._parentController != null)
			{
				top_controller = top_controller._parentController;
			}
			var expansion_index = top_controller.kept_expansion.indexOf(
				top_controller.dataStorePrefix + '::' + _data.content[this._context.settings.row_id]
			);
			if(top_controller.kept_expansion && expansion_index >= 0)
			{
				top_controller.kept_expansion.splice(expansion_index, 1);
				// Use a timeout since the DOM nodes might not be finished yet
				window.setTimeout(function()
				{
					_row.expansionButton.trigger('click');
				}, et2_dataview_grid.ET2_GRID_INVALIDATE_TIMEOUT);
			}
		}

		// Set the row data
		this._setRowData(this._template.rowData, tr, mgrs);

		return rowWidget;
	}

	/**
	 * Get the cloned web component
	 */
	_cloneWebComponent(entry, row, data)
	{
		// Widget was already cloned from original row, just get it
		let widget = entry.nodeFuncs[0](row);
		// Original widget
		let original = entry.nodeFuncs[0](this._dataRow);

		// N.B. cloneNode widget is missing its unreflected properties and we need to get them from original
		let widget_class = window.customElements.get(widget.localName);
		let properties = widget_class ? widget_class.properties : [];
		for(let key in properties)
		{
			widget[key] = original[key];
		}

		if(!widget || widget.localName !== entry.widget.localName)
		{
			return null;
		}

		// Need to set the parent to the nm or egw() (and probably others) will not be as expected, using window instead
		// of app.  arrayMgrs are fine without this though
		widget._parent = this._context;

		// Deal with the deferred properties like booleans with string values - we can't reflect them, and we don't want to lose them
		// No need to transform here, that happens later
		Object.assign(data, entry.widget.deferredProperties);

		return widget;
	}

	/**
	 * Placeholder for empty row
	 *
	 * The empty row placeholder is used when there are no results to display.
	 * This allows the user to still have a drop target, or use actions that
	 * do not require a row ID, such as 'Add new'.
	 */
	_createEmptyPrototype()
	{
		var label = this._context && this._context.options && this._context.options.settings.placeholder;

		var placeholder = jQuery(document.createElement("td"))
			.attr("colspan", this._rowProvider.getColumnCount())
			.css("height", "19px")
			.text(typeof label != "undefined" && label ? label : egw().lang("No matches found"));
		this._rowProvider._prototypes["empty"] = jQuery(document.createElement("tr"))
			.addClass("egwGridView_empty")
			.append(placeholder);
	}

	/** -- PRIVATE FUNCTIONS -- **/

	/**
	 * Returns an array containing objects which have variable attributes
	 *
	 * @param {et2_widget} _widget
	 */
	_getVariableAttributeSet(_widget)
	{
		let variableAttributes = [];

		const process = function(_widget)
		{
			// Create the attribtues
			var hasAttr = false;
			var widgetData = {
				"widget": _widget,
				"data": []
			};

			// Get all attribute values
			let attrs = [];
			if(_widget.getDetachedAttributes)
			{
				_widget.getDetachedAttributes(attrs);
				// Manually add in ID for consideration, value won't get pulled without it
				attrs.push("id");
			}
			for(let key of attrs)
			{
				let attr_name = key;
				let val = _widget[key];
				if(typeof val == "string" && val.indexOf("$") >= 0)
				{
					hasAttr = true;
					widgetData.data.push({
						"attribute": attr_name,
						"expression": val
					});
				}
			}

			// Legacy
			if(_widget.instanceOf(et2_widget))
			{
				for(const key in _widget.attributes)
				{
					if(typeof _widget.attributes[key] !== "object")
					{
						continue;
					}

					let attr_name = key;
					let val;
					if(!_widget.attributes[key].ignore &&
						typeof _widget.options != "undefined" &&
						typeof _widget.options[key] != "undefined")
					{
						val = _widget.options[key];
					}
					// TODO: Improve detection
					if(typeof val == "string" && val.indexOf("$") >= 0)
					{
						hasAttr = true;
						widgetData.data.push({
							"attribute": attr_name,
							"expression": val
						});
					}
				}
			}

			// Add the entry if there is any data in it
			if(hasAttr)
			{
				variableAttributes.push(widgetData);
			}
		};

		// Check each column
		const columns = _widget._widgets;
		for(var i = 0; i < columns.length; i++)
		{
			// If column is hidden, don't process it
			if(typeof columns[i] === 'undefined' || this._context && this._context.columns && this._context.columns[i] && !this._context.columns[i].visible)
			{
				continue;
			}
			columns[i].iterateOver(process, this);
		}

		return variableAttributes;
	}

	_seperateWidgets(_varAttrs)
	{
		// The detachable array contains all widgets which implement the
		// et2_IDetachedDOM interface for all needed attributes
		var detachable = [];

		// The remaining array creates all widgets which have to be completely
		// cloned when the widget tree is created
		var remaining = [];

		// Iterate over the widgets
		for(var i = 0; i < _varAttrs.length; i++)
		{
			var widget = _varAttrs[i].widget;

			// Check whether the widget parents are not allready in the "remaining"
			// slot -  if this is the case do not include the widget at all.
			var insertWidget = true;
			var checkWidget = function(_widget)
			{
				if(_widget.parent != null)
				{
					for(var i = 0; i < remaining.length; i++)
					{
						if(remaining[i].widget == _widget.parent)
						{
							insertWidget = false;
							return;
						}
					}

					checkWidget(_widget.parent);
				}
			};
			checkWidget(widget);

			// Handle the next widget if this one should not be included.
			if(!insertWidget)
			{
				continue;
			}

			// Check whether the widget implements the et2_IDetachedDOM interface
			var isDetachable = false;
			if(widget.implements && widget.implements(et2_IDetachedDOM))
			{
				// Get all attributes the widgets supports to be set in the
				// "detached" mode
				var supportedAttrs = [];
				if(widget.getDetachedAttributes)
				{
					widget.getDetachedAttributes(supportedAttrs);
				}
				supportedAttrs.push("id");
				isDetachable = true;

				for(var j = 0; j < _varAttrs[i].data.length/* && isDetachable*/; j++)
				{
					var data = _varAttrs[i].data[j];

					var supportsAttr = supportedAttrs.indexOf(data.attribute) != -1;

					if(!supportsAttr)
					{
						egw.debug("warn", "et2_IDetachedDOM widget " +
							widget._type + " does not support " + data.attribute);
					}

					isDetachable = isDetachable && supportsAttr;
				}
			}

			// Insert the widget into the correct slot
			if(isDetachable)
			{
				detachable.push(_varAttrs[i]);
			}
			else
			{
				remaining.push(_varAttrs[i]);
			}
		}

		return {
			"detachable": detachable,
			"remaining": remaining
		};
	}

	/**
	 * Removes to DOM code for all widgets in the "remaining" slot
	 *
	 * @param {object} _rowTemplate
	 */
	_stripTemplateRow(_rowTemplate)
	{
		_rowTemplate.placeholders = [];

		for(var i = 0; i < _rowTemplate.seperated.remaining.length; i++)
		{
			var entry = _rowTemplate.seperated.remaining[i];

			// Issue a warning - widgets which do not implement et2_IDOMNode
			// are very slow
			egw.debug("warn", "Non-clonable widget '" + entry.widget._type + "' in dataview row - this " +
				"might be slow", entry);

			// Set the placeholder for the entry to null
			entry.placeholder = null;

			// Get the outer DOM-Node of the widget
			if(entry.widget.implements(et2_IDOMNode))
			{
				var node = entry.widget.getDOMNode(entry.widget);

				if(node && node.parentNode)
				{
					// Get the parent node and replace the node with a placeholder
					entry.placeholder = document.createElement("span");
					node.parentNode.replaceChild(entry.placeholder, node);
					_rowTemplate.placeholders.push({
						"widget": entry.widget,
						"func": this._compileDOMAccessFunc(_rowTemplate.row,
							entry.placeholder)
					});
				}
			}
		}
	}

	_nodeIndex(_node)
	{
		if(_node.parentNode == null)
		{
			return 0;
		}
		for(var i = 0; i < _node.parentNode.childNodes.length; i++)
		{
			if(_node.parentNode.childNodes[i] == _node)
			{
				return i;
			}
		}

		return -1;
	}

	/**
	 * Returns a function which does a relative access on the given DOM-Node
	 *
	 * @param {DOMElement} _root
	 * @param {DOMElement} _target
	 */
	_compileDOMAccessFunc(_root, _target)
	{
		function recordPath(_root, _target, _path)
		{
			if(typeof _path == "undefined")
			{
				_path = [];
			}

			if(_root != _target && _target)
			{
				// Get the index of _target in its parent node
				var idx = this._nodeIndex(_target);
				if(idx >= 0)
				{
					// Add the access selector
					_path.unshift("childNodes[" + idx + "]");

					// Record the remaining path
					return recordPath.call(this, _root, _target.parentNode, _path);
				}

				throw("Internal error while compiling DOM access function.");
			}
			else
			{
				_path.unshift("_node");
				return "return " + _path.join(".") + ";";
			}
		}

		return new Function("_node", recordPath.call(this, _root, _target));
	}

	/**
	 * Builds relative paths to the DOM-Nodes and compiles fast-access functions
	 *
	 * @param {object} _rowTemplate
	 */
	_buildNodeAccessFuncs(_rowTemplate)
	{
		for(var i = 0; i < _rowTemplate.seperated.detachable.length; i++)
		{
			var entry = _rowTemplate.seperated.detachable[i];

			// Get all needed nodes from the widget
			var nodes = window.customElements.get(entry.widget.localName) ? [entry.widget] : entry.widget.getDetachedNodes();
			var nodeFuncs = entry.nodeFuncs = new Array(nodes.length);

			// Record the path to each DOM-Node
			for(var j = 0; j < nodes.length; j++)
			{
				nodeFuncs[j] = this._compileDOMAccessFunc(_rowTemplate.row,
					nodes[j]);
			}
		}
	}

	/**
	 * Match category-ids from class attribute eg. "cat_15" or "123,456,789 "
	 *
	 * Make sure to not match numbers inside other class-names.
	 *
	 * We can NOT use something like /(^| |,|cat_)([0-9]+)( |,|$)/g as it wont find all cats in "123,456,789 "!
	 */
	cat_regexp : RegExp = /(^| |,|cat_)([0-9]+)/g;
	/**
	 * Regular expression used to filter out non-nummerical chars from above matches
	 */
	cat_cleanup : RegExp = /[^0-9]/g;

	/**
	 * Applies additional row data (like the class) to the tr
	 *
	 * @param {object} _data
	 * @param {DOMElement} _tr
	 * @param {object} _mgrs
	 */
	_setRowData(_data, _tr, _mgrs)
	{
		// TODO: Implement other fields than "class"
		if(_data["class"])
		{
			var classes = _mgrs["content"].expandName(_data["class"]);

			// Get fancy with categories
			var cats = [];
			// Assume any numeric class is a category
			if(_data["class"].indexOf("cat") !== -1 || classes.match(/[0-9]+/))
			{
				// Accept either cat, cat_id or category as ID, and look there for category settings
				var category_location = _data["class"].match(/(cat(_id|egory)?)/);
				if(category_location)
				{
					category_location = category_location[0];
				}

				cats = classes.match(this.cat_regexp) || [];
				classes = classes.replace(this.cat_regexp, '');

				// Set category class
				for(var i = 0; i < cats.length; i++)
				{
					// Need cat_, classes can't start with a number
					var cat_id = cats[i].replace(this.cat_cleanup, '');
					var cat_class = 'cat_' + cat_id;

					classes += ' ' + cat_class;
				}
				classes += " row_category";
			}
			classes += " row";
			_tr.setAttribute("class", classes);
		}
		if(_data['valign'])
		{
			var align = _mgrs["content"].expandName(_data["valign"]);
			_tr.setAttribute("valign", align);
		}
	}
}

/**
 * @augments et2_widget
 */
export class et2_nextmatch_rowWidget extends et2_widget implements et2_IDOMNode
{
	private _widgets : any[];
	private _row : any;

	/**
	 * Constructor
	 *
	 * @param _mgrs
	 * @param _row
	 * @memberOf et2_nextmatch_rowWidget
	 */
	constructor(_mgrs, _row)
	{
		// Call the parent constructor with some dummy attributes
		super(null, {"id": "", "type": "rowWidget"});

		// Initialize some variables
		this._widgets = [];

		// Copy the given DOM node and the content arrays
		this._mgrs = _mgrs;
		this._row = _row;
	}

	/**
	 * Copies the given array manager and clones the given widgets and inserts
	 * them into the row which has been passed in the constructor.
	 *
	 * @param {array} _widgets
	 */
	createWidgets(_widgets)
	{
		// Clone the given the widgets with this element as parent
		this._widgets = [];
		let row_id = 0;
		for(var i = 0; i < _widgets.length; i++)
		{
			// Disabled columns might be missing widget - skip it
			if(!_widgets[i])
			{
				continue;
			}

			this._widgets[i] = _widgets[i].clone(this);
			this._widgets[i].loadingFinished();
			// Set column alignment from widget
			if(this._widgets[i].align && this._row.childNodes[row_id])
			{
				this._row.childNodes[row_id].align = this._widgets[i].align;
			}
			row_id++;
		}
	}

	/**
	 * Returns the column node for the given sender
	 *
	 * @param {et2_widget} _sender
	 * @return {DOMElement}
	 */
	getDOMNode(_sender)
	{
		var row_id = 0;
		for(var i = 0; i < this._widgets.length; i++)
		{
			// Disabled columns might be missing widget - skip it
			if(!this._widgets[i])
			{
				continue;
			}
			if(this._widgets[i] == _sender && this._row.childNodes[row_id])
			{
				return this._row.childNodes[row_id].childNodes[0]; // Return the i-th td tag
			}
			row_id++;
		}

		return null;
	}

}

/**
 * @augments et2_widget
 */
export class et2_nextmatch_rowTemplateWidget extends et2_widget implements et2_IDOMNode
{
	private _root : any;
	private _row : any;
	private _widgets : any[];

	/**
	 * Constructor
	 *
	 * @param _root
	 * @param _row
	 * @memberOf et2_nextmatch_rowTemplateWidget
	 */
	constructor(_root, _row)
	{
		// Call the parent constructor with some dummy attributes
		super(null, {"id": "", "type": "rowTemplateWidget"});

		this._root = _root;
		this._mgrs = {};
		this._row = _row;

		// Set parent to root widget, so sub-widget calls still work
		this._parent = _root;

		// Clone the widgets inside the placeholders array
		this._widgets = [];
	}

	createWidgets(_mgrs, _widgets : { widget : et2_widget, func(_row : any) : any; }[])
	{
		// Set the array managers - don't use setArrayMgrs here as this creates
		// an unnecessary copy of the object
		this._mgrs = _mgrs;

		this._widgets = new Array(_widgets.length);
		for(var i = 0; i < _widgets.length; i++)
		{
			this._row.childNodes[0].childNodes[0];

			this._widgets[i] = {
				"widget": _widgets[i].widget.clone(this),
				"node": _widgets[i].func(this._row)
			};
			this._widgets[i].widget.loadingFinished();
		}
	}

	/**
	 * Returns the column node for the given sender
	 *
	 * @param {et2_widget} _sender
	 * @return {DOMElement}
	 */
	getDOMNode(_sender : et2_widget) : HTMLElement
	{

		for(var i = 0; i < this._widgets.length; i++)
		{
			if(this._widgets[i].widget == _sender)
			{
				return this._widgets[i].node;
			}
		}

		return null;
	}

}