var bricks = window.bricks || {};
bricks.PageContent = class extends bricks.Layout {
	constructor(opts){
		super(opts);
	}
}

bricks.AccordionItem = class extends bricks.Layout {
	constructor(opts){
		super(opts);
		this.set_css('accordion-item');
	}
}

bricks.AccordionInfo = class extends bricks.Layout {
	constructor(opts){
		super(opts);
		this.set_css('accordion-item-info');
	}
}

bricks.DynamicAccordion = class extends bricks.VScrollPanel {
	/*
		{
			"data_url",
			"data_method",
			"cache_limit",
			"page_rows",
			"record_view"
			"content_rely_on"
			"content_rely_value"
			"editable"
			"fields":
			"record_toolbar",
			"record_toolbar_collapsable"
			"header"
			"content_view"
		}
	*/
	constructor(opts){
		super(opts);
		this.element = this.dom_element;
		this.loader = new bricks.PageDataLoader({
			url:this.opts.data_url,
			params:this.opts.data_params,
			pagerows:this.opts.page_rows,
			method:this.opts.data_method,
			cache_pages:this.opts.cache_limit
		});
		this.old_params = null;
		this.active_item = null;
		this.active_content = null;
		this.loading = false;
		schedule_once(this.build_all.bind(this), 0.1);
	}
	async build_all(){
		if (this.title){
			this.build_title();
		}
		if (this.description){
			this.build_description();
		}
		if (this.toolbar){
			await this.build_toolbar();
		}
		if (this.editable && this.fields){
			await this.build_new_form();
		}
		if (! this.noheader){
			await this.build_header();
		}
		var filler = new bricks.Filler();
		this.container = new bricks.VScrollPanel({ });
		filler.add_widget(this.container);
		this.add_widget(filler);
		this.container.bind('min_threshold', this.load_previous_page.bind(this));
		this.container.bind('max_threshold', this.load_next_page.bind(this));
		await this.render();
	}
	async build_header(){
		await this.build_info(this);
	}

	async build_info(item, record){
		if (! this.fields && !record){
			return;
		}
		var w;
		var tb = null;
		var info = new bricks.AccordionInfo({});
		info.data = record;
		item.add_widget(info);
		if (this.editable){
			tb = this.build_record_toolbar(info, record);
		}
		if (! record){
			record = {};
			for (var i=0;i<this.fields.length;i++){
				var f = this.fields[i];
				record[f.name] = f.label || f.name;
			}
		}
		w = await bricks.widgetBuild(this.record_view, info, record);
		if (w){
			if (tb){
			w.add_widget(tb, 0);
			}
			info.add_widget(w);
		} else {
			bricks.debug('bricks.widgetBuild(), tmpl=', this.record_view, 'record=', record);
		}       
		return info;
	}
	update_record(info, record){
		console.log('update_record():info=', info)
		var w = info.parent;
		var hided;
		var content = w.children[1];
		var hided = content.is_hide();
		var fields = [];
		for (var i=0; i< this.fields.length; i++){
			var f = bricks.extend({}, this.fields[i]);
			f.value = record[f.name];
			fields.push(f);
		}
		var f = new bricks.Form({
				"cheight":this.editable.form_cheight||7,
				"submit_url":this.editable.update_data_url+'?id=' + record.id,
				"fields":fields
		});
		content.add_widget(f, 0);
		if (hided){
			content.show();
		}
		f.bind('submited', this.update_record_finish.bind(this, info, content, hided, f));
	}
	async update_record_finish(info, content, hided, form){
		var d = form.getValue();
		content.remove_widget(form);
		if (hided){
			content.hide();
		}
		var record = bricks.extend(info.data, d);
		var w = info.children[0];
		info.clear_widgets();
		var rtb = w.children[0];
		var w = await bricks.widgetBuild(this.record_view, info, record);
		w.add_widget(rtb, 0);
		info.add_widget(w);
	}
	delete_record(info, record){
	}
	async build_new_form(){
		var desc = {
			"widgettype":"VBox",
			"options":{
				"height":"auto",
			},
			"subwidgets":[
				{
					"id":"new",
					"widgettype":"IconBar",
					"options":{
						"tools":[
							{
								"name":"add",
								"tip":"add a new record",
								"icon":this.editable.add_icon || bricks_resource('imgs/add.png')
							}
						]
					}
				},
				{
					"widgettype":"Form",
					"options":{
						"cheight":this.editable.form_cheight||7,
						"submit_url":this.editable.new_data_url,
						"fields":this.fields
					}
				}
			]
		};
		var w = await bricks.widgetBuild(desc, this);
		w.children[1].hide();
		w.children[0].bind('add',function(){ w.children[1].toggle_hide()})
		this.new_form = w.children[1];
		this.new_form.bind('submited', this.render.bind(this));
		this.add_widget(w);
	}
	async render(params) {
		params = params || {};
		if (params == this.old_params){
			return;
		}
		this.old_params = params;
		bricks.debug('params=', params, 'render() called');
		var d = await this.loader.loadData(params);
		if (d){
			this.container.clear_widgets();
			await this.dataHandle(d);
		} else {
			bricks.debug(params, 'load data return null');
		}
	}
	async dataHandle(d){
		var data = d.rows;
		var page = d.add_page;
		await this.renderAccordionItems(data, page);
		if (d.delete_page){
			this.delete_page(d.delete_page);
		}
	}
	build_record_toolbar(info, record){
		var c = new bricks.Layout({cwidth:2.5, height:'auto'})
		if (! record){
			c.set_style('height', '20px');
			return c;
		}
		var desc = {
			cwidth:2.5,
			tools:[
				{
					name:"update",
					tip:"update record in this line",
					icon:this.editable.update_icon || bricks_resource('imgs/update.png')
				},
				{
					name:'delete',
					tip:"delete record in this line",
					icon:this.editable.delete_icon || bricks_resource('imgs/delete.png')
				}
			]
		}
		var w = new bricks.IconBar(desc);
		w.bind('update', this.update_record.bind(this, info, record));
		w.bind('delete', this.delete_record.bind(this, info, record));
		c.add_widget(w);
		return c;
	}
	async renderAccordionItems(data, page) {
		var pos;
		for (var i=0;i<data.length;i++){
			if (this.loader.is_max_page(page)){
				pos = -1;
			} else {
				pos = i;
			}
			var record = data[i];
			var item = new bricks.AccordionItem({});
			var info = await this.build_info(item, record);
			this.content_rely_value = this.content_rely_value || true;
			var build_content = true;
			if (this.content_rely_on){
				var v = this.content_rely_value || true;
				if(record[this.content_rely_on] != v){
					build_content = false;
				}
			}
			content = null;
			var content = new bricks.VBox({
				height:'auto',
				display:'none'
			});
			content.set_css('accordion-item-content');
			content.hide();
			if ( build_content ){
				info.bind('click', this.toggle_content.bind(this, info, content, record));
			}
			item.add_widget(content);
			item.set_attribute('data-page', page);
			this.container.add_widget(item, pos);
		};
	}
	delete_page(page){
		var items = this.dom_element.querySelectorAll('[data-page="' + page + '"]');
		for (var i=0;i<items.length;i++) {
			var w = items[i].bricks_widget;
			this.container.remove_widget(w);
		}
	}
	async toggle_content(info, content, record, event){
		var h = this.container.dom_element.offsetHeight  - 3 * info.dom_element.offsetHeight;
		content.set_style('height', h + 'px');
		if (this.active_content){
			if (this.active_content != content){
				this.active_content.clear_widgets();
				this.active_content.hide();
				this.active_content = null;
			}
		}
		content.toggle_hide();
		if (content.dom_element.style.display == 'none'){
			bricks.debug('content just collapsed');
			content.clear_widgets();
			this.active_content = null;
			return;
		}
		
		var jc = new bricks.HttpJson();
		var w;
		w = await bricks.widgetBuild(this.content_view, content, record);
		if (w){
			content.add_widget(w);
			this.active_content = content;
		} else {
			this.active_content = null;
			content.hide();
		}
	}
	async load_previous_page(){
		if (this.loading){
			bricks.debug('this.loading is set, do not thing');
			return;
		}
		this.loading = true;
		try {
			var d = await this.loader.loadPreviousPage();
			if (d){
				this.dataHandle(d);
				var total = this.container.dom_element.scrollHeight - this.container.dom_element.clientHeight;
				this.container.dom_element.scrollTop = d.pos_rate * total;
			} else {
				bricks.debug(this.loader, 'load previous page error');
			}
		} catch (e) {
			bricks.debug('e=', e);
		}
		this.loading = false;
	}
	async load_next_page(){
		if (this.loading){
			bricks.debug('this.loading is set, do not thing');
			return;
		}
		this.loading = true;
		try {
			var d = await this.loader.loadNextPage();
			if (d){
				this.dataHandle(d);
				var total = this.container.dom_element.scrollHeight - this.container.dom_element.clientHeight;
				this.container.dom_element.scrollTop = d.pos_rate * total;
			} else {
				bricks.debug(this.loader, 'load next page error');
			}
		} catch (e){
			bricks.debug('error happened', e);
		}
		this.loading = false;
		bricks.debug('load_next_page() finished');
	}
}
bricks.Factory.register('DynamicAccordion', bricks.DynamicAccordion);