namespace services.concept
{
	
	/**
	 */
	export type type_bloated =
	{
		id : int;
		description : string;
		type :
		{
			id : int;
			value : string;
		};
		tags : Array<
			{
				id : int;
				value : string;
			}
		>;
		expressions : Array<
			{
				id : int;
				language :
				{
					id : int;
					value : string;
				};
				value : string;
			}
		>;
	};
	
	
	/**
	 */
	export type type_exposal =
	{
		id : int;
		description : string;
		type : string;
		tags : Array<string>;
		expressions : {[language : string] : Array<string>};
	};
	
	
	/**
	 */
	function parse_tags(
		tags_raw : string
	) : Array<string>
	{
		return (
			(tags_raw === null)
			? []
			: tags_raw.split(",")
		);
	}
	
	
	/**
	 */
	function parse_expressions
	(
		expressions_raw : string
	) : {[language : string] : Array<string>}
	{
		let result : {[language : string] : Array<string>} = {};
		const parts : Array<string> = expressions_raw.split(",");
		parts.forEach
		(
			(part) =>
			{
				const [language, value] : Array<string> = part.split(":", 2);
				if (! result.hasOwnProperty(language)) result[language] = [];
				result[language].push(value);
			}
		);
		return result;
	}
	
	
	/**
	 */
	export async function bloat
	(
		concept_id : int
	) : Promise<type_bloated>
	{
		const concept_entity : entities.concept = await repositories.concept.read(concept_id);
		const type_value : string = (await repositories.type.read(concept_entity.type_id))["value"];
		let result : type_bloated =
		{
			"id": concept_id,
			"description": concept_entity.description,
			"type":
			{
				"id": concept_entity.type_id,
				"value": type_value,
			},
			"tags": [],
			"expressions": [],
		};
		for await (const tag_id of concept_entity.tags)
		{
			const tag_value : string = (await repositories.tag.read(tag_id))["value"];
			result.tags.push({"id": tag_id, "value": tag_value});
		}
		for await (const expression_id of concept_entity.expressions)
		{
			const expression_row : type_row = await repositories.expression.read(expression_id);
			const language_id : int = expression_row["language_id"];
			const language_row : type_row = (await repositories.language.read(expression_row["language_id"]));
			result.expressions.push
			(
				{
					"id": expression_id,
					"language":
					{
						"id": language_id,
						"value": language_row["value"]
					},
					"value": expression_row["value"]
				}
			);
		}
		return Promise.resolve<type_bloated>(result);
	}
	
	
	/**
	 */
	export async function expose
	(
		concept_id : int
	) : Promise<type_exposal>
	{
		const bloated : type_bloated = await bloat(concept_id);
		return Promise.resolve<type_exposal>
		(
			{
				"id": bloated.id,
				"description": bloated.description,
				"type": bloated.type.value,
				"tags": bloated.tags.map(tag_entry => tag_entry.value),
				"expressions": (
					() =>
					{
						let expressions : {[language : string] : Array<string>} = {};
						bloated.expressions.forEach
						(
							expression_entry =>
							{
								const language : string = expression_entry.language.value;
								if (! expressions.hasOwnProperty(language))
								{
									expressions[language] = [];
								}
								expressions[language].push(expression_entry.value);
							}
						);
						return expressions;
					}
				) (),
			}
		);
	}
	
	
	/**
	 */
	export async function export_
	(
	) : Promise<Array<type_exposal>>
	{
		const rows : Array<type_row> = await repositories.concept.export();
		return Promise.resolve<Array<type_exposal>>
		(
			rows.map
			(
				(row) => (
					{
						"id": row["id"],
						"type": row["type"],
						"description": row["description"],
						"tags": parse_tags(row["tags"]),
						"expressions": parse_expressions(row["expressions"]),
					}
				)
			)
		);
	}

	
	/**
	 */
	export async function search
	(
		part : string
	) : Promise<Array<type_exposal>>
	{
		const concept_ids : Array<int> = await repositories.concept.search(part);
		let result : Array<type_exposal> = [];
		for await (const concept_id of concept_ids)
		{
			result.push(await expose(concept_id));
		}
		return Promise.resolve<Array<type_exposal>>(result);
	}
	
	
	/**
	 */
	export function get_translations
	(
		language_from : string,
		language_to : string,
		part : string
	) : Promise<Array<type_row>>
	{
		return repositories.concept.get_translations
		(
			language_from,
			language_to,
			part
		);
	}
	
	
	/**
	 */
	export async function suck
	(
		concept_thing : any
	) : Promise<int>
	{
		const type_id : int = await services.type.give(concept_thing["type"]);
		const concept_id : int = await repositories.concept_core.create
		(
			{
				"type_id": type_id,
				"description": concept_thing["description"],
			}
		);
		for await (const tag_value of concept_thing["tags"])
		{
			const tag_id : int = await services.tag.give(tag_value);
			const concept_tag_id : int = await repositories.concept_tags.create
			(
				{
					"concept_id": concept_id,
					"tag_id": tag_id,
				}
			);
		}
		for await (const [language_value, expression_values] of Object.entries(concept_thing["expressions"]))
		{
			const language_id : int = await services.language.give(language_value);
			for await (const expression_value of <Array<string>>(expression_values))
			{
				const expression_id : int = await services.expression.give(language_id, expression_value);
				const concept_expression_id : int = await repositories.concept_expressions.create
				(
					{
						"concept_id": concept_id,
						"expression_id": expression_id,
					}
				);
			}
		}
		return concept_id;
	}
	
}