/**
 */
namespace _zeitbild.frontend_web.helpers
{
	
	/**
	 */
	var _template_cache : Record<string, string> = {};

	
	/**
	 */
	export async function template_coin(
		group : string,
		name : string,
		data : Record<string, string>
	) : Promise<string>
	{
		let content : string;
		const key : string = lib_plankton.string.coin(
			"{{group}}/{{name}}",
			{
				"group": group,
				"name": name,
			}
		);
		if (! (key in _template_cache)) {
			content = (
				(
					await lib_plankton.file.read(
						lib_plankton.string.coin(
							"templates/{{group}}/{{name}}.html.tpl",
							{
								"group": group,
								"name": name,
							}
						)
					)
				)
				.toString()
			);
			_template_cache[key] = content;
		}
		else {
			content = _template_cache[key];
		}
		return Promise.resolve<string>(
			lib_plankton.string.coin(
				content,
				data
			)
		);
	}
	
	
	/**
	 * @todo outsource
	 */
	export async function promise_row<type_result>(
		members : Array<
			() => Promise<type_result>
		>
	) : Promise<
		Array<
			type_result
		>
	>
	{
		let results : Array<type_result> = [];
		for await (const member of members) {
			results.push(await member());
		}
		return Promise.resolve<Array<type_result>>(results);
	}
	
	
	/**
	 * @todo timezone
	 */
	export function datetime_format(
		datetime : (null | lib_plankton.pit.type_datetime)
	) : string
	{
		if (datetime === null) {
			return "-";
		}
		else {
			return lib_plankton.string.coin(
				"{{date}}{{macro_time}}",
				{
					"date": lib_plankton.string.coin(
						"{{year}}-{{month}}-{{day}}",
						{
							"year": datetime.date.year.toFixed(0).padStart(4, "0"),
							"month": datetime.date.month.toFixed(0).padStart(2, "0"),
							"day": datetime.date.day.toFixed(0).padStart(2, "0"),
						}
					),
					"macro_time": (
						(datetime.time === null)
						?
						""
						:
						lib_plankton.string.coin(
							",{{time}}",
							{
								"time": lib_plankton.string.coin(
									"{{hour}}:{{minute}}",
									{
										"hour": datetime.time.hour.toFixed(0).padStart(2, "0"),
										"minute": datetime.time.minute.toFixed(0).padStart(2, "0"),
										"second": datetime.time.second.toFixed(0).padStart(2, "0"),
									}
								),
							}
						)
					),
				}
			);
		}
	}
	
	
	/**
	 */
	export function timespan_format(
		from : lib_plankton.pit.type_datetime,
		to : (null | lib_plankton.pit.type_datetime)
	) : string
	{
		return lib_plankton.string.coin(
			"{{from}}{{macro_to}}",
			{
				"from": datetime_format(from),
				"macro_to": (
					(to === null)
					?
					""
					:
					lib_plankton.string.coin(
						" - {{to}}",
						{
							"to": datetime_format(to),
						}
					)
				),
			}
		);
	}
	
	/**
	 */
	export function input_access_level(
	) : lib_plankton.zoo_input.interface_input<_zeitbild.frontend_web.type.enum_access_level>
	{
		return (
			new lib_plankton.zoo_input.class_input_wrapped<
				/*("none" | "view" | "edit" | "admin")*/string,
				_zeitbild.frontend_web.type.enum_access_level
			>(
				new lib_plankton.zoo_input.class_input_selection(
					[
						{
							"value": "none",
							"label": lib_plankton.translate.get("access_level.none"),
						},
						{
							"value": "view",
							"label": lib_plankton.translate.get("access_level.view")
						},
						{
							"value": "edit",
							"label": lib_plankton.translate.get("access_level.edit")
						},
						{
							"value": "admin",
							"label": lib_plankton.translate.get("access_level.admin")
						},
					]
				),
				(raw) => {
					switch (raw) {
						case "none": return _zeitbild.frontend_web.type.enum_access_level.none;
						case "view": return _zeitbild.frontend_web.type.enum_access_level.view;
						case "edit": return _zeitbild.frontend_web.type.enum_access_level.edit;
						case "admin": return _zeitbild.frontend_web.type.enum_access_level.admin;
					}
				},
				(access_level) => {
					switch (access_level) {
						case _zeitbild.frontend_web.type.enum_access_level.none: return "none";
						case _zeitbild.frontend_web.type.enum_access_level.view: return "view";
						case _zeitbild.frontend_web.type.enum_access_level.edit: return "edit";
						case _zeitbild.frontend_web.type.enum_access_level.admin: return "admin";
					}
				},
			)
		);
	}
	
	
	/**
	 */
	export async function input_attributed_access(
	) : Promise<lib_plankton.zoo_input.class_input_hashmap<_zeitbild.frontend_web.type.user_id, _zeitbild.frontend_web.type.enum_access_level>>
	{
		const users : Array<{id : _zeitbild.frontend_web.type.user_id; name : string;}> = await _zeitbild.frontend_web.backend.user_list(
		);
		return Promise.resolve(
			new lib_plankton.zoo_input.class_input_hashmap<_zeitbild.frontend_web.type.user_id, _zeitbild.frontend_web.type.enum_access_level>(
				// hash_key
				(user_id) => user_id.toFixed(0),
				// key_input_factory
				() => new lib_plankton.zoo_input.class_input_wrapped<string, int>(
					new lib_plankton.zoo_input.class_input_selection(
						users
						.map(
							(user) => ({
								"value": user.id.toFixed(0),
								"label": user.name,
							})
						)
					),
					x => parseInt(x),
					x => x.toFixed(0)
				),
				// value_input_factory
				() => input_access_level()
			)
		);
	}
	
}