namespace _lixer_event_reminder
{
	
	/**
	 */
	export async function main(
		args_raw : Array<string>
	): Promise<void>
	{
		// args
		const arg_handler : lib_plankton.args.class_handler = new lib_plankton.args.class_handler(
			{
				"action": lib_plankton.args.class_argument.positional({
					"index": 0,
					"type": lib_plankton.args.enum_type.string,
					"mode": lib_plankton.args.enum_mode.replace,
					"default": "run",
					"info": "what to do : help | fetch | send | run",
					"name": "action",
				}),
				"conf_path": lib_plankton.args.class_argument.volatile({
					"indicators_long": ["conf-path"],
					"indicators_short": ["c"],
					"type": lib_plankton.args.enum_type.string,
					"mode": lib_plankton.args.enum_mode.replace,
					"default": "conf.json",
					"info": "path to configuration file",
					"name": "conf-path",
				}),
				"message": lib_plankton.args.class_argument.volatile({
					"indicators_long": ["message"],
					"indicators_short": ["m"],
					"type": lib_plankton.args.enum_type.string,
					"mode": lib_plankton.args.enum_mode.replace,
					"default": "test",
					"info": "message to send",
					"name": "message",
				}),
				"help": lib_plankton.args.class_argument.volatile({
					"indicators_long": ["help"],
					"indicators_short": ["h"],
					"type": lib_plankton.args.enum_type.boolean,
					"mode": lib_plankton.args.enum_mode.replace,
					"default": false,
					"info": "alias for action 'help'",
					"name": "help",
				}),
			}
		);
		const args : Record<string, any> = arg_handler.read(
			lib_plankton.args.enum_environment.cli,
			args_raw.join(" ")
		);
		
		// init
		const conf : _lixer_event_reminder.conf.type_conf = await lib_plankton.conf.load<_lixer_event_reminder.conf.type_conf>(
			_lixer_event_reminder.conf.schema,
			args.conf_path
		);
		
		// exec
		if (args.help || (args.action === "help")) {
			process.stdout.write(
				arg_handler.generate_help(
					{
						"programname": "lixer-event-reminder",
						"description": "a telegram bot, which sends reminders about upcoming events",
						"executable": "node build/event-reminder",
					}
				)
			);
		}
		else {
			switch (args.action) {
				default: {
					throw (new Error("unhandled action: " + args.action));
					break;
				}
				case "fetch": {
					const updates : Array<any> = await lib_plankton.telegram.bot_call_get_updates(
						conf.bot_token
					);
					process.stdout.write(JSON.stringify(updates, undefined, "\t") + "\n");
					break;
				}
				case "send": {
					for (const target of conf.targets) {
						const message = await lib_plankton.telegram.bot_call_send_message(
							conf.bot_token,
							target.chat_id,
							args.message
						);
					}
					break;
				}
				case "run": {
					const sources : Array<_lixer_event_reminder.type_source> = conf.sources.map(
						source_raw => _lixer_event_reminder.sources.factory(source_raw)
					);
					const targets : Array<_lixer_event_reminder.type_target> = conf.targets.map(
						target_raw => target_raw
					);
					const now : lib_plankton.pit.type_pit = lib_plankton.pit.now();
					
					const events : Array<_lixer_event_reminder.type_event> = (
						(await Promise.all(sources.map(source => source.fetch())))
						.reduce((x, y) => x.concat(y), [])
					);
					for (const event of events) {
						const begin : lib_plankton.pit.type_pit = lib_plankton.pit.from_datetime(event.begin);
						for (const target of targets) {
							for (const hours of target.interval) {
								const remind : boolean = lib_plankton.pit.is_between(
									lib_plankton.pit.shift_hour(begin, hours),
									now,
									/**
									 * @todo parametrize window
									 */
									lib_plankton.pit.shift_hour(now, +24)
								);
								if (remind) {
									lib_plankton.log._info(
										"remind",
										{
											"details": {
												"event": event,
												"target": target,
											}
										}
									);
									/**
									 * @todo activate
									 * @todo format better
									 */
									const message = await lib_plankton.telegram.bot_call_send_message(
										conf.bot_token,
										target.chat_id,
										lib_plankton.string.coin(
											"{{title}} | {{begin}}",
											{
												"title": event.title,
												"begin": lib_plankton.pit.datetime_format(event.begin),
											}
										)
									);
								}
							}
						}
					}
					
					break;
				}
			}
		}

		return Promise.resolve<void>(undefined);
	}
}

_lixer_event_reminder.main(process.argv.slice(2))
	.then(() => {})
	.catch((reason) => {process.stderr.write(String(reason) + "\n");})
;