/*
Espe | Ein schlichtes Werkzeug zur Mitglieder-Verwaltung | Backend
Copyright (C) 2024 Christian Fraß

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public 
License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later 
version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied 
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see 
<https://www.gnu.org/licenses/>. 
 */

namespace _espe.repository.group
{
	
	/**
	 */
	var _store : (
		null
		|
		lib_plankton.storage.type_store<
			_espe.type.group_id,
			Record<string, any>,
			{},
			lib_plankton.storage.type_sql_table_autokey_search_term,
			Record<string, any>
		>
	) = null;
	
	
	/**
	 */
	function get_store(
	) : lib_plankton.storage.type_store<
		_espe.type.group_id,
		Record<string, any>,
		{},
		lib_plankton.storage.type_sql_table_autokey_search_term,
		Record<string, any>
	>
	{
		if (_store === null)
		{
			_store = lib_plankton.storage.sql_table_autokey_store(
				{
					"database_implementation": _espe.helpers.database_implementation(),
					"table_name": "groups",
					"key_name": "id",
				}
			);
		}
		else
		{
			// do nothing
		}	
		return _store;
	}
	
	
	/**
	 */
	type type_dispersal = Record<string, any>;
	
	
	/**
	 */
	function encode(
		object : _espe.type.group_object
	) : type_dispersal
	{
		return {
			"name": object.name,
			"label": object.label,
		};
	}
	
	
	/**
	 */
	function decode(
		dispersal : type_dispersal
	) : _espe.type.group_object
	{
		return {
			"name": dispersal["name"],
			"label": dispersal["label"],
		};
	}
	
	
	/**
	 * @todo optimize
	 */
	export async function list(
		search_term : (null | string)
	) : Promise<
		Array<
			{
				id : _espe.type.group_id;
				preview : {
					name : string;
					label : string;
				};
			}
		>
	>
	{
		return (
			(await get_store().search(null))
			.filter(
				({"key": key, "preview": preview}) => (
					(
						(search_term === null)
						||
						(search_term.length <= 1)
					)
					?
					true
					:
					preview["name"].toLowerCase().includes(search_term.toLowerCase())
				)
			)
			.map(
				({"key": key, "preview": preview}) => ({
					"id": key,
					"preview": {
						"name": preview["name"],
						"label": preview["label"],
					},
				})
			)
		);
	}
	
	
	/**
	 */
	export async function read(
		id : _espe.type.group_id
	) : Promise<_espe.type.group_object>
	{
		const row : Record<string, any> = await get_store().read(id);
		
		const dispersal : type_dispersal = row;
		
		return decode(dispersal);
	}
	
	
	/**
	 */
	export async function create(
		value : _espe.type.group_object
	) : Promise<_espe.type.group_id>
	{
		const dispersal : type_dispersal = encode(value);
		
		// core
		const id : _espe.type.group_id = await get_store().create(dispersal);
		
		return id;
	}
	
	
	/**
	 * @todo replace groups smartly
	 */
	export async function update(
		id : _espe.type.group_id,
		value : _espe.type.group_object
	) : Promise<void>
	{
		const dispersal : type_dispersal = encode(value);
		
		// core
		await get_store().update(id, dispersal);		
	}
	
	
	/**
	 */
	export async function delete_(
		id : _espe.type.group_id
	) : Promise<void>
	{
		// core
		await get_store().delete(id);
	}
	
	
	/**
	 */
	export async function dump(
	) : Promise<
		Array<
			{
				id : _espe.type.group_id;
				object : _espe.type.group_object;
			}
		>
	>
	{
		return (
			Promise.all(
				(await get_store().search(null))
				.map(hit => hit.key)
				.map(
					id => (
						read(id)
						.then(
							(object) => ({
								"id": id,
								"object": object
							})
						)
					)
				)
			)
		);
	}
	
}