namespace formgen.ioc
{

	/**
	 */
	type type_data = {
		manufacturer : string;
		power : float;
	};


	/**
	 */
	type type_value = {
		id : string;
		data : (null | type_data);
	};


	/**
	 */
	type type_retrieve_data = ((id : string) => Promise<type_data>);


	/**
	 */
	export class class_ioc_zerez implements interface_ioc<type_value>
	{

		/**
		 */
		private retrieve_data : type_retrieve_data;

		
		/**
		 */
		private hint : (null | string);
		

		/**
		 */
		private ioc_id : (null | interface_ioc<string>);


		/**
		 */
		private ioc_data : (null | interface_ioc<Record<string, any>>);


		/**
		 */
		public constructor(
			retrieve : type_retrieve_data,
			{
				"hint": hint = null,
			}
			:
			{
				hint ?: (null | string);
			}
			=
			{
			}
		)
		{
			this.retrieve_data = retrieve;
			this.hint = hint;
			this.ioc_id = null;
			this.ioc_data = null;
		}


		/**
		 */
		private data_encode(
			data : type_data
		) : Record<string, any>
		{
			return {
				"manufacturer": data.manufacturer,
				"power": data.power,
			};
		}


		/**
		 */
		private data_decode(
			data_raw : Record<string, any>
		) : type_data
		{
			return {
				"manufacturer": data_raw["manufacturer"],
				"power": data_raw["power"],
			};
		}


		/**
		 * [implementation]
		 */
		public async setup(
			element_target : Element
		) : Promise<void>
		{
			const element_container : Element = document.createElement("div");
			element_container.classList.add("formgen-ioc");
			element_container.classList.add("formgen-ioc-zerez");
			let dom_button_retrieve : HTMLButtonElement;
			{
				// hint
				{
					if (this.hint === null)
					{
						// do nothing
					}
					else
					{
						await (new formgen.info.class_info(this.hint)).setup(element_container);
					}
				}
				// id ioc
				{
					this.ioc_id = new class_ioc_text(
						{
							"label": "ID",
						}
					);
					await this.ioc_id.setup(element_container);
				}
				// retrieve button
				{
					dom_button_retrieve = document.createElement("button");
					dom_button_retrieve.textContent = "ermitteln";
					element_container.appendChild(dom_button_retrieve);
				}
				// data ioc
				{
					this.ioc_data = new class_ioc_group(
						[
							{
								"name": "manufacturer",
								"ioc": new class_ioc_text(
									{
										"label": "Hersteller",
									}
								),
								"marked": false,
							},
							{
								"name": "power",
								"ioc": new class_ioc_number(
									{
										"label": "Leistung",
									}
								),
								"marked": false,
							},
						]
					);
					await this.ioc_data.setup(element_container);
				}
			}
			// interaction
			{
				dom_button_retrieve.addEventListener(
					"click",
					async () => {
						if ((this.ioc_id === null) || (this.ioc_data == null))
						{
							// do nothing
						}
						else
						{
							const id : string = await this.ioc_id.read();
							const data : type_data = await this.retrieve_data(id);
							await this.ioc_data.write(this.data_encode(data));
						}
					}
				);
			}
			element_target.appendChild(element_container);
		}
		
		
		/**
		 * [implementation]
		 */
		public async read(
		) : Promise<type_value>
		{
			if (this.ioc_id === null)
			{
				throw (new Error("not properly initialized"));
			}
			else
			{
				return {
					"id": await this.ioc_id.read(),
					"data": this.data_decode(await this.ioc_data.read()),
				};
			}
		}
		
		
		/**
		 * [implementation]
		 */
		public async write(
			value : type_value
		) : Promise<void>
		{
			if (this.ioc_id === null)
			{
				throw (new Error("not properly initialized"));
			}
			else
			{
				if (value.data === null)
				{
					throw (new Error("invalid data"));
				}
				else
				{
					await this.ioc_id.write(value.id);
					await this.ioc_data.write(this.data_encode(value.data));
				}
			}
		}


		/**
		 * [implementation]
		 */
		public listen(
			handler : type_handler<type_value>
		) : void
		{
			this.ioc_id.listen(handler);
			this.ioc_data.listen(handler);
		}
		
	}

}