// Adopted and converted to typescript from https://github.com/6pac/SlickGrid/blob/master/plugins/slick.rowdetailview.js
// heavily modified
import { mixin } from 'vs/base/common/objects';
import * as nls from 'vs/nls';

export class RowDetailView {

	public onAsyncResponse = new Slick.Event<any>();
	public onAsyncEndUpdate = new Slick.Event<any>();
	public onAfterRowDetailToggle = new Slick.Event<any>();
	public onBeforeRowDetailToggle = new Slick.Event<any>();

	private _grid: any;
	private _expandedRows: any = [];
	private _handler = new Slick.EventHandler();
	private _defaults: any = {
		columnId: '_detail_selector',
		cssClass: null,
		toolTip: '',
		width: 30
	};

	private _dataView: any;
	private _options: any;

	constructor(options) {
		this._options = mixin(options, this._defaults, false);
	}

	public init(grid: any): void {
		this._grid = grid;
		this._dataView = this._grid.getData();

		// Update the minRowBuffer so that the view doesn't disappear when it's at top of screen + the original default 3
		this._grid.getOptions().minRowBuffer = this._options.panelRows + 3;

		this._handler
			.subscribe(this._grid.onClick, (e, args) => this.handleClick(e, args))
			.subscribe(this._grid.onSort, (e, args) => this.handleSort(e, args))
			.subscribe(this._grid.onScroll, (e, args) => this.handleScroll(e, args));

		this._grid.getData().onRowCountChanged.subscribe(() => { this._grid.updateRowCount(); this._grid.render(); });
		this._grid.getData().onRowsChanged.subscribe((e, a) => { this._grid.invalidateRows(a.rows); this._grid.render(); });

		// subscribe to the onAsyncResponse so that the plugin knows when the user server side calls finished
		this.subscribeToOnAsyncResponse();
	}

	public destroy() {
		this._handler.unsubscribeAll();
		this.onAsyncResponse.unsubscribe(undefined);
		this.onAsyncEndUpdate.unsubscribe(undefined);
		this.onAfterRowDetailToggle.unsubscribe(undefined);
		this.onBeforeRowDetailToggle.unsubscribe(undefined);
	}

	public getOptions(options: any) {
		return this._options;
	}

	public setOptions(options: any) {
		this._options = $.extend(true, {}, this._options, options);
	}

	public handleClick(e: any, args: any): void {
		// clicking on a row select checkbox
		if (this._options.useRowClick || this._grid.getColumns()[args.cell].id === this._options.columnId && $(e.target).hasClass('detailView-toggle')) {
			// if editing, try to commit
			if (this._grid.getEditorLock().isActive() && !this._grid.getEditorLock().commitCurrentEdit()) {
				e.preventDefault();
				e.stopImmediatePropagation();
				return;
			}

			let item = this._dataView.getItem(args.row);

			// trigger an event before toggling
			this.onBeforeRowDetailToggle.notify({
				grid: this._grid,
				item: item
			}, e, this);

			this.toggleRowSelection(item);

			// trigger an event after toggling
			this.onAfterRowDetailToggle.notify({
				grid: this._grid,
				item: item
			}, e, this);

			e.stopPropagation();
			e.stopImmediatePropagation();
		}
	}

	// Sort will just collapse all of the open items
	public handleSort(e, args) {
		this.collapseAll();
	}

	// If we scroll save detail views that go out of cache range
	public handleScroll(e, args) {

		let range = this._grid.getRenderedRange();

		let start: number = (range.top > 0 ? range.top : 0);
		let end: number = (range.bottom > this._dataView.getLength() ? range.bottom : this._dataView.getLength());
		if (end <= 0) {
			return;
		}

		// Get the item at the top of the view
		let topMostItem = this._dataView.getItemByIdx(start);

		// Check it is a parent item
		if (topMostItem._parent === undefined) {
			// This is a standard row as we have no parent.
			let nextItem = this._dataView.getItemByIdx(start + 1);
			if (nextItem !== undefined && nextItem._parent !== undefined) {
				// This is likely the expanded Detail Row View
				// Check for safety
				if (nextItem._parent === topMostItem) {
					this.saveDetailView(topMostItem);
				}
			}
		}

		// Find the bottom most item that is likely to go off screen
		let bottomMostItem = this._dataView.getItemByIdx(end - 1);

		// If we are a detailView and we are about to go out of cache view
		if (bottomMostItem._parent !== undefined) {
			this.saveDetailView(bottomMostItem._parent);
		}
	}

	// Toggle between showing and hiding a row
	public toggleRowSelection(row) {
		this._grid.getData().beginUpdate();
		this.handleAccordionShowHide(row);
		this._grid.getData().endUpdate();
	}

	// Collapse all of the open items
	public collapseAll() {
		for (let i = this._expandedRows.length - 1; i >= 0; i--) {
			this.collapseItem(this._expandedRows[i]);
		}
	}

	// Saves the current state of the detail view
	public saveDetailView(item) {
		let view = $('#innerDetailView_' + item.id);
		if (view) {
			let html = $('#innerDetailView_' + item.id).html();
			if (html !== undefined) {
				item._detailContent = html;
			}
		}
	}

	// Colapse an Item so it is notlonger seen
	public collapseItem(item) {

		// Save the details on the collapse assuming onetime loading
		if (this._options.loadOnce) {
			this.saveDetailView(item);
		}

		item._collapsed = true;
		for (let idx = 1; idx <= item._sizePadding; idx++) {
			this._dataView.deleteItem(item.id + '.' + idx);
		}
		item._sizePadding = 0;
		this._dataView.updateItem(item.id, item);

		// Remove the item from the expandedRows
		this._expandedRows = this._expandedRows.filter((r) => {
			return r.id !== item.id;
		});
	}

	// Expand a row given the dataview item that is to be expanded
	public expandItem(item) {
		item._collapsed = false;
		this._expandedRows.push(item);

		// In the case something went wrong loading it the first time such a scroll of screen before loaded
		if (!item._detailContent) {
			item._detailViewLoaded = false;
		}

		// display pre-loading template
		if (!item._detailViewLoaded || this._options.loadOnce !== true) {
			item._detailContent = this._options.preTemplate(item);
		} else {
			this.onAsyncResponse.notify({
				itemDetail: item,
				detailView: item._detailContent
			}, undefined, this);
			this.applyTemplateNewLineHeight(item);
			this._dataView.updateItem(item.id, item);

			return;
		}

		this.applyTemplateNewLineHeight(item);
		this._dataView.updateItem(item.id, item);

		// async server call
		this._options.process(item);
	}

	/**
	 * subscribe to the onAsyncResponse so that the plugin knows when the user server side calls finished
	 * the response has to be as "args.itemDetail" with it's data back
	 */
	public subscribeToOnAsyncResponse() {
		this.onAsyncResponse.subscribe((e, args) => {
			if (!args || !args.itemDetail) {
				throw 'Slick.RowDetailView plugin requires the onAsyncResponse() to supply "args.itemDetail" property.';
			}

			// If we just want to load in a view directly we can use detailView property to do so
			if (args.detailView) {
				args.itemDetail._detailContent = args.detailView;
			} else {
				args.itemDetail._detailContent = this._options.postTemplate(args.itemDetail);
			}

			args.itemDetail._detailViewLoaded = true;

			let idxParent = this._dataView.getIdxById(args.itemDetail.id);
			this._dataView.updateItem(args.itemDetail.id, args.itemDetail);

			// trigger an event once the post template is finished loading
			this.onAsyncEndUpdate.notify({
				grid: this._grid,
				itemDetail: args.itemDetail
			}, e, this);
		});
	}

	public handleAccordionShowHide(item) {
		if (item) {
			if (!item._collapsed) {
				this.collapseItem(item);
			} else {
				this.expandItem(item);
			}
		}
	}

	//////////////////////////////////////////////////////////////
	//////////////////////////////////////////////////////////////
	public getPaddingItem(parent, offset) {
		let item: any = {};

		for (let prop in this._grid.getData()) {
			item[prop] = null;
		}
		item.id = parent.id + '.' + offset;

		//additional hidden padding metadata fields
		item._collapsed = true;
		item._isPadding = true;
		item._parent = parent;
		item._offset = offset;

		return item;
	}

	public getErrorItem(parent, offset) {
		let item: any = {};
		item.id = parent.id + '.' + offset;
		item._collapsed = true;
		item._isPadding = false;
		item._parent = parent;
		item._offset = offset;
		item.jobId = parent.jobId;
		item.name = parent.message ? parent.message : nls.localize('rowDetailView.loadError','Loading Error...');
		return item;
	}

	//////////////////////////////////////////////////////////////
	//create the detail ctr node. this belongs to the dev & can be custom-styled as per
	//////////////////////////////////////////////////////////////
	public applyTemplateNewLineHeight(item, showError = false) {
		// the height seems to be calculated by the template row count (how many line of items does the template have)
		let rowCount = this._options.panelRows;

		//calculate padding requirements based on detail-content..
		//ie. worst-case: create an invisible dom node now &find it's height.
		let lineHeight = 13; //we know cuz we wrote the custom css innit ;)
		item._sizePadding = Math.ceil(((rowCount * 2) * lineHeight) / this._grid.getOptions().rowHeight);
		item._height = (item._sizePadding * this._grid.getOptions().rowHeight);

		let idxParent = this._dataView.getIdxById(item.id);
		for (let idx = 1; idx <= item._sizePadding; idx++) {
			if (showError) {
				this._dataView.insertItem(idxParent + idx, this.getErrorItem(item, 'error'));
			} else {
				this._dataView.insertItem(idxParent + idx, this.getPaddingItem(item, idx));
			}
		}
	}

	public getColumnDefinition() {
		return {
			id: this._options.columnId,
			name: '',
			toolTip: this._options.toolTip,
			field: 'sel',
			width: this._options.width,
			resizable: false,
			sortable: false,
			cssClass: this._options.cssClass,
			formatter: (row, cell, value, columnDef, dataContext) => this.detailSelectionFormatter(row, cell, value, columnDef, dataContext)
		};
	}

	public detailSelectionFormatter(row, cell, value, columnDef, dataContext) {

		if (dataContext._collapsed === undefined) {
			dataContext._collapsed = true;
			dataContext._sizePadding = 0;	//the required number of pading rows
			dataContext._height = 0;	//the actual height in pixels of the detail field
			dataContext._isPadding = false;
			dataContext._parent = undefined;
			dataContext._offset = 0;
		}

		if (dataContext._isPadding === true) {
			//render nothing
		} else if (dataContext._collapsed) {
			return '<div class=\'detailView-toggle expand\'></div>';
		} else {
			let html = [];
			let rowHeight = this._grid.getOptions().rowHeight;
			let bottomMargin = 5;

			//V313HAX:
			//putting in an extra closing div after the closing toggle div and ommiting a
			//final closing div for the detail ctr div causes the slickgrid renderer to
			//insert our detail div as a new column ;) ~since it wraps whatever we provide
			//in a generic div column container. so our detail becomes a child directly of
			//the row not the cell. nice =)  ~no need to apply a css change to the parent
			//slick-cell to escape the cell overflow clipping.

			//sneaky extra </div> inserted here-----------------v
			html.push("<div class='detailView-toggle collapse'></div></div>");

			html.push("<div id='cellDetailView_", dataContext.id, "' class='dynamic-cell-detail' ");   //apply custom css to detail
			html.push("style='height:", dataContext._height, "px;"); //set total height of padding
			html.push("top:", rowHeight, "px'>");             //shift detail below 1st row
			html.push("<div id='detailViewContainer_", dataContext.id, "'  class='detail-container' style='max-height:" + (dataContext._height - rowHeight + bottomMargin) + "px'>"); //sub ctr for custom styling
			html.push("<div id='innerDetailView_", dataContext.id, "'>", dataContext._detailContent, "</div></div>");
			//&omit a final closing detail container </div> that would come next

			return html.join('');
		}
		return null;
	}

	public resizeDetailView(item) {
		if (!item) return;

		// Grad each of the dom items
		let mainContainer = document.getElementById('detailViewContainer_' + item.id);
		let cellItem = document.getElementById('cellDetailView_' + item.id);
		let inner = document.getElementById('innerDetailView_' + item.id);

		if (!mainContainer || !cellItem || !inner) return;

		for (let idx = 1; idx <= item._sizePadding; idx++) {
			this._dataView.deleteItem(item.id + "." + idx);
		}

		let rowHeight = this._grid.getOptions().rowHeight; // height of a row
		let lineHeight = 13; //we know cuz we wrote the custom css innit ;)

		// Get the inner Item height as this will be the actual size
		let itemHeight = inner.clientHeight;

		// Now work out how many rows
		let rowCount = Math.ceil(itemHeight / rowHeight) + 1;

		item._sizePadding = Math.ceil(((rowCount * 2) * lineHeight) / rowHeight);
		item._height = (item._sizePadding * rowHeight);

		// If the padding is now more than the original minRowBuff we need to increase it
		if (this._grid.getOptions().minRowBuffer < item._sizePadding) {
			// Update the minRowBuffer so that the view doesn't disappear when it's at top of screen + the original default 3
			this._grid.getOptions().minRowBuffer = item._sizePadding + 3;
		}

		mainContainer.setAttribute("style", "max-height: " + item._height + "px");
		if (cellItem) {
			cellItem.setAttribute("style", "height: " + item._height + "px;top:" + rowHeight + "px");
		}

		let idxParent = this._dataView.getIdxById(item.id);
		for (let idx = 1; idx <= item._sizePadding; idx++) {
			this._dataView.insertItem(idxParent + idx, this.getPaddingItem(item, idx));
		}
	}
}