/*
This file is part of »dali«.

Copyright 2025 'kcf' <fenris@folksprak.org>

»dali« is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

»dali« is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with »dali«. If not, see <http://www.gnu.org/licenses/>.
 */


namespace _dali.widgets.menu
{
	
	/**
	 */
	type type_entry_data = {
		label : string;
		groups : Array<string>;
		action : (() => void);
	}
	
	
	/**
	 */
	export class class_widget_menu implements lib_plankton.zoo_widget.interface_widget
	{
		
		/**
		 */
		private entries : Array<
			{
				data : type_entry_data;
				element : (null | HTMLElement);
			}
		>;
		
		
		/**
		 */
		private initial_groups : Array<string>;
		
		
		/**
		 */
		private label : (null | string);
		
		
		/**
		 */
		private container : (null | HTMLElement);
		
		
		/**
		 */
		public constructor(
			entry_data_list : Array<type_entry_data>,
			{
				"initial_groups": initial_groups = [],
				"initial_label": initial_label = "=",
			}
			:
			{
				initial_groups ?: Array<string>;
				initial_label ?: string;
			}
			=
			{
			}
		)
		{
			this.entries = entry_data_list.map(
				entry_data => (
					{
						"data": entry_data,
						"element": null,
					}
				)
			);
			this.initial_groups = initial_groups;
			this.label = initial_label;
			this.container = null;
		}
		
		
		/**
		 */
		public set_groups(
			groups : Array<string>
		)
		: void
		{
			this.entries.forEach(
				entry => {
					const active : boolean = groups.some(group => entry.data.groups.includes(group));
					entry.element.classList.toggle("widget-menu-entry-hidden", (! active));
				}
			);
		}
		
		/**
		 */
		public set_label(
			label ?: string
		)
		: void
		{
			this.label = label;
			this.container.querySelector(".widget-menu-button").textContent = (
				(this.label === null)
				?
				"[=]"
				:
				("[" + this.label + "]")
			);
		}
		
		
		/**
		 */
		private toggle_collapsed(
			{
				"mode": mode = null,
			}
			:
			{
				mode ?: (null | boolean);
			}
			=
			{
			}
		)
		: void
		{
			this.container.classList.toggle("widget-menu-collapsed", mode ?? undefined);
		}
		
		
		/**
		 * [implementation]
		 */
		public async load(
			target_element : Element
		)
		: Promise<void>
		{
			// container
			{
				const dom_container : HTMLElement = document.createElement("div");
				dom_container.classList.add("widget-menu");
				// button
				{
					const dom_button : HTMLElement = document.createElement("button");
					dom_button.textContent = "[" + this.label + "]";
					dom_button.classList.add("widget-menu-button");
					dom_button.addEventListener(
						"click",
						() => {
							this.toggle_collapsed();
						}
					);
					dom_container.classList.toggle("widget-menu-collapsed", true);
					dom_container.appendChild(dom_button);
				}
				// platform
				{
					const dom_platform : HTMLElement = document.createElement("div");
					dom_platform.classList.add("widget-menu-platform");
					{
						const dom_list : HTMLElement = document.createElement("ul");
						dom_list.classList.add("widget-menu-entries");
						this.entries.forEach(
							entry => {
								const dom_entry : HTMLElement = document.createElement("li");
								dom_entry.classList.add("widget-menu-entry");
								dom_entry.textContent = entry.data.label;
								dom_entry.addEventListener(
									"click",
									() => {
										this.toggle_collapsed({"mode": true});
										entry.data.action();
									}
								);
								dom_list.appendChild(dom_entry);
								entry.element = dom_entry;
							}
						);
						dom_platform.appendChild(dom_list);
					}
					dom_container.appendChild(dom_platform);
				}
				target_element.appendChild(dom_container);
				this.container = dom_container;
			}
			
			this.set_groups(this.initial_groups);
		}
		
	}
	
}