namespace mod_model.app
{
	
	/**
	 */
	export enum enum_condition
	{
		logged_out,
		logged_in,
	}
	
	
	/**
	 */
	export type type_subject =
	{
		condition : (null | enum_condition);
		loginkey : (null | string);
		rental_counter : int;
		rentals :
		{
			offer : Record<mod_model.rental.type_id, lib_mvc.type_model<mod_model.rental.type_subject>>;
			order : Array<mod_model.rental.type_id>;
		};
	};
	
	
	/**
	 */
	export function inital
	(
		loginkey : (null | string)
	) : type_subject
	{
		return {
			"condition": ((loginkey === null) ? enum_condition.logged_out : enum_condition.logged_in),
			"loginkey": loginkey,
			"rental_counter": 0,
			"rentals": {"offer": {}, "order": []},
		};
	}
	
	
	/**
	 */
	export async function login
	(
		model : lib_mvc.type_model<type_subject>,
		username : string,
		password : string
	) : Promise<void>
	{
		const result : any = await lib_nextbike.login(username, password);
		model.state.loginkey = result["user"]["loginkey"];
		model.state.condition = enum_condition.logged_in;
		lib_storage.write("nextbike_loginkey", model.state.loginkey);
		lib_mvc.model_notify<type_subject, {}>
		(
			model,
			{
				"type": "login",
				"data": {}
			}
		);
	}
	
	
	/**
	 * @todo end rentals?
	 */
	export async function logout
	(
		model : lib_mvc.type_model<type_subject>
	) : Promise<void>
	{
		const result : any = await lib_nextbike.logout(model.state.loginkey);
		lib_storage.kill("nextbike_loginkey");
		model.state.condition = enum_condition.logged_out;
		model.state.rentals = {"offer": {}, "order": []};
		lib_mvc.model_notify<type_subject, {}>
		(
			model,
			{
				"type": "logout",
				"data": {}
			}
		);
	}
	
	
	/**
	 */
	export async function prepare_rental
	(
		model : lib_mvc.type_model<type_subject>
	) : Promise<void>
	{
		model.state.rental_counter += 1;
		const rental_id : mod_model.rental.type_id = model.state.rental_counter.toFixed(0);
		const rental_subject : mod_model.rental.type_subject = mod_model.rental.initial(rental_id);
		const rental_model : lib_mvc.type_model<mod_model.rental.type_subject> = lib_mvc.model_make(rental_subject);
		lib_mvc.model_listen<mod_model.rental.type_subject, any>
		(
			rental_model,
			async (event) =>
			{
				switch (event.type)
				{
					default:
					{
						// do nothing
						break;
					}
					case "start":
					{
						await start_rental(model, rental_subject.bike_name);
						break;
					}
					case "pause":
					{
						await pause_rental(model, rental_subject.bike_name);
						break;
					}
					case "open":
					{
						await open_lock(model, rental_subject.bike_name);
						break;
					}
					case "end":
					{
						await end_rental(model, rental_subject.id);
						break;
					}
				}
			}
		);
		model.state.rentals.offer[rental_id] = lib_mvc.model_make<mod_model.rental.type_subject>(rental_subject);
		model.state.rentals.order.push(rental_id);
		lib_mvc.model_notify<type_subject, {rental_model : lib_mvc.type_model<mod_model.rental.type_subject>}>
		(
			model,
			{
				"type": "new_rental",
				"data": {"rental_model": rental_model}
			}
		);
	}
	
	
	/**
	 */
	async function start_rental
	(
		model : lib_mvc.type_model<type_subject>,
		bike_name : string
	) : Promise<void>
	{
		const result : any = await lib_nextbike.rental_begin(model.state.loginkey, bike_name);
		lib_mvc.model_notify<type_subject, {}>
		(
			model,
			{
				"type": "start_rental",
				"data": {}
			}
		);
	}
	
	
	/**
	 */
	async function pause_rental
	(
		model : lib_mvc.type_model<type_subject>,
		bike_name : string
	) : Promise<void>
	{
		const result : any = await lib_nextbike.rental_break(model.state.loginkey, bike_name);
		lib_mvc.model_notify<type_subject, {}>
		(
			model,
			{
				"type": "pause_rental",
				"data": {}
			}
		);
	}
	
	
	/**
	 */
	async function open_lock
	(
		model : lib_mvc.type_model<type_subject>,
		bike_name : string
	) : Promise<void>
	{
		const result : any = await lib_nextbike.open_lock(model.state.loginkey, bike_name);
		lib_mvc.model_notify<type_subject, {}>
		(
			model,
			{
				"type": "open_lock",
				"data": {}
			}
		);
	}
	
	
	/**
	 */
	function end_rental
	(
		model : lib_mvc.type_model<type_subject>,
		rental_id : mod_model.rental.type_id
	) : Promise<void>
	{
		lib_mvc.model_notify<type_subject, {}>
		(
			model,
			{
				"type": "end_rental",
				"data": {"id": rental_id}
			}
		);
		model.state.rentals.order = model.state.rentals.order.filter(x => (x !== rental_id));
		delete model.state.rentals.offer[rental_id];
		return Promise.resolve<void>(undefined);
	}
	
}