// import {int} from './types';


namespace helpers.database
{
	
	/**
	 */
	type type_query = {
		sql_template : string;
		arguments : {[name : string] : any};
	};
	
	
	/**
	 */
	function resolve_path
	(
		path_raw : string
	) : string
	{
		return ("sql/" + path_raw.replace(new RegExp("\\.", "g"), "/") + ".sql");
	}
	
	
	/**
	 */
	function fix_query
	(
		query : type_query,
	) : type_query
	{
		return {
			"sql_template": query.sql_template.replace
			(
				new RegExp(":([0-9a-zA-Z_-]+)", "g"),
				"$$$1"
			),
			"arguments": (
				() =>
				{
					let arguments_ : {[name : string] : any} = {};
					Object.keys(query.arguments).forEach
					(
						(name) => {arguments_["$" + name] = query.arguments[name];}
					);
					return arguments_;
				}
			) (),
		};
	}
	
	
	/**
	 */
	function query_do_free_
	(
		query : type_query
	) : Promise<void>
	{
		const nm_sqlite3 = require("sqlite3");
		const query_fixed : type_query = fix_query(query);
		// console.info("---\n" + query_fixed.sql_template + "\n" + JSON.stringify(query_fixed.arguments) + "\n---\n");
		return (
			new Promise<void>
			(
				(resolve, reject) =>
				{
					const database/* : nm_sqlite3.Database*/ = new nm_sqlite3.Database("data.sqlite");
					database.run
					(
						query_fixed.sql_template,
						query_fixed.arguments,
						function (error)
						{
							if (error)
							{
								reject(error);
							}
							else
							{
								resolve(undefined);
							}
						}
					);
					database.close();
				}
			)
		);
	}
	
	
	/**
	 */
	function query_get_free_
	(
		query : type_query
	) : Promise<Array<type_row>>
	{
		const nm_sqlite3 = require("sqlite3");
		const query_fixed : type_query = fix_query(query);
		// console.info("---\n" + query_fixed.sql_template + "\n" + JSON.stringify(query_fixed.arguments) + "\n---\n");
		return (
			new Promise<Array<type_row>>
			(
				(resolve, reject) =>
				{
					const database/* : nm_sqlite3.Database*/ = new nm_sqlite3.Database("data.sqlite");
					database.all
					(
						query_fixed.sql_template,
						query_fixed.arguments,
						function (error, rows)
						{
							// console.info({error,rows});
							if (error)
							{
								reject(error);
							}
							else
							{
								resolve(rows);
							}
						}
					);
					database.close();
				}
			)
		);
	}
	
		
	/**
	 */
	function query_put_free_
	(
		query : type_query
	) : Promise<int>
	{
		const nm_sqlite3 = require("sqlite3");
		const query_fixed : type_query = fix_query(query);
		// console.info("---\n" + query_fixed.sql_template + "\n" + JSON.stringify(query_fixed.arguments) + "\n---\n");
		return (
			new Promise<int>
			(
				(resolve, reject) =>
				{
					const database/* : nm_sqlite3.Database*/ = new nm_sqlite3.Database("data.sqlite");
					database.run
					(
						query_fixed.sql_template,
						query_fixed.arguments,
						function (error)
						{
							if (error)
							{
								reject(error);
							}
							else
							{
								resolve(this.lastID);
							}
						}
					);
					database.close();
				}
			)
		);
	}
	
	
	/**
	 */
	export function query_do_free
	(
		sql_template : string,
		arguments_ : {[name : string] : any} = {}
	) : Promise<void>
	{
		return query_do_free_({"sql_template": sql_template, "arguments": arguments_});
	}
	
	
	/**
	 */
	export function query_get_free
	(
		sql_template : string,
		arguments_ : {[name : string] : any} = {}
	) : Promise<Array<type_row>>
	{
		return query_get_free_({"sql_template": sql_template, "arguments": arguments_});
	}
	
	
	/**
	 */
	export function query_put_free
	(
		sql_template : string,
		arguments_ : {[name : string] : any} = {}
	) : Promise<int>
	{
		return query_put_free_({"sql_template": sql_template, "arguments": arguments_});
	}
	
	
	/**
	 */
	export function query_do_named
	(
		name : string,
		arguments_ : {[name : string] : any} = {}
	) : Promise<void>
	{
		return query_do_free
		(
			helpers.file.read(resolve_path(name)),
			arguments_
		);
	}
	
	
	/**
	 */
	export function query_get_named
	(
		name : string,
		arguments_ : {[name : string] : any} = {}
	) : Promise<Array<type_row>>
	{
		return query_get_free
		(
			helpers.file.read(resolve_path(name)),
			arguments_
		);
	}
	
	
	/**
	 */
	export function query_put_named
	(
		name : string,
		arguments_ : {[name : string] : any} = {}
	) : Promise<int>
	{
		return query_put_free
		(
			helpers.file.read(resolve_path(name)),
			arguments_
		);
	}
	
}