import ApplicationConfig from "../config/ApplicationConfig";
const config = ApplicationConfig.loadDefault();

export default abstract class DBConnectionProvider<POOL_TYPE, CONNECTIONS> {
    public getDBConfig(value?:string) {
        if (!value) {
            value = 'JDBC.DRIVER.INFO';
        }
        const dbinfo = config.getArray(value);
        if (dbinfo.length != 5) {
            throw new Error('DB config property [${value}]가 올바르지 않습니다. **.env 환경설정을 확인하세요.');
        }
        const DB_CONFIG = {
            host:dbinfo[0],
            port:Number(dbinfo[1]),
            database:dbinfo[2],
            user:dbinfo[3],
            password:dbinfo[4],
            connectionLimit:30,
            waitForConnections:true
        };
        return DB_CONFIG;
    }
    public abstract createPool(envKey:string):POOL_TYPE;
    public abstract getConnection(pool:POOL_TYPE):Promise<CONNECTIONS>;
}