namespace _zeitbild.api
{
	
	/**
	 */
	export function register_events(
		rest_subject : lib_plankton.rest.type_rest
	) : void
	{
		register<
			{
				from : int;
				to : int;
				calendar_ids : (
					null
					|
					Array<_zeitbild.type.calendar_id>
				);
			},
			Array<
				{
					calendar_id : int;
					calendar_name : string;
					event : _zeitbild.type.event_object;
				}
			>
		>(
			rest_subject,
			lib_plankton.http.enum_method.get,
			"/events",
			{
				"description": "stellt Veranstaltungen aus verschiedenen Kalendern zusammen",
				"query_parameters": [
					{
						"name": "from",
						"required": true,
						"description": "UNIX timestamp",
					},
					{
						"name": "to",
						"required": true,
						"description": "UNIX timestamp",
					},
					{
						"name": "calendar_ids",
						"required": false,
						"description": "comma separated",
					},
				],
				"output_schema": () => ({
					"type": "array",
					"items": {
						"type": "object",
						"nullable": false,
						"additionalProperties": false,
						"properties": {
							"calendar_id": {
								"type": "number",
								"nullable": false,
							},
							"event": {
								"type": "object",
								"additionalProperties": false,
								"properties": {
									"name": {
										"type": "string",
										"nullable": false,
									},
									"begin": {
										"type": "int",
										"nullable": false,
									},
									"end": {
										"type": "int",
										"nullable": true,
									},
									"location": {
										"type": "string",
										"nullable": true,
									},
									"description": {
										"type": "string",
										"nullable": true,
									},
								},
								"required": [
									"name",
									"begin",
									"end",
									"location",
									"description",
								]
							}
						},
						"required": [
							"calendar_ids",
							"calendar_name",
							"event",
						],
					}
				}),
				"restriction": restriction_none, // TODO
				"execution": async (stuff) => {
					const session : {key : string; value : lib_plankton.session.type_session;} = await session_from_stuff(stuff);
					const user_id : _zeitbild.type.user_id = await _zeitbild.service.user.identify(session.value.name);
					
					const from : _zeitbild.helpers.type_pit = parseInt(stuff.query_parameters["from"]);
					const to : _zeitbild.helpers.type_pit = parseInt(stuff.query_parameters["to"]);
					const calendar_ids_wanted : Array<_zeitbild.type.calendar_id> = (
						(
							("calendar_ids" in stuff.query_parameters)
							&&
							(stuff.query_parameters["calendar_ids"] !== null)
						)
						?
						lib_plankton.call.convey(
							stuff.query_parameters["calendar_ids"],
							[
								(x : string) => x.split(","),
								(x : Array<string>) => x.map(parseInt),
								(x : Array<int>) => x.filter(y => (! isNaN(y)))
							]
						)
						:
						null
					);
					const calendar_ids_allowed : Array<_zeitbild.type.calendar_id> = (
						(await _zeitbild.service.calendar.overview(user_id))
						.map((x : any) => x.id)
					);
					const calendar_ids : Array<_zeitbild.type.calendar_id> = (
						(calendar_ids_wanted === null)
						?
						calendar_ids_allowed
						:
						(
							calendar_ids_wanted
							.filter(
								(calendar_id) => calendar_ids_allowed.includes(calendar_id)
							)
						)
					);
					const data = await _zeitbild.service.calendar.gather_events(
						calendar_ids,
						from,
						to
					);
					return Promise.resolve({
						"status_code": 200,
						"data": data,
					});
				}
			}
		);
	}
	
}