'use strict';
const apiConfig = require( '../../../config/apiConfig.json' );
const Knex = require('knex');
const { Model } = require('objection');

const UNINIT = 0;
const INIT = 1;
const ONLINE = 2;
const OFFLINE = 3;

class SystemServices {
    constructor(){
        this.SystemServiceState = UNINIT;
    }

    async setup(){
        this.SystemServiceState = UNINIT;
    }

    async init(){
        this.SystemServiceState = INIT;
    }

    async connect(){
        const knex = Knex({
          client: 'mysql',
          useNullAsDefault: true,
          connection: {
                host: apiConfig.sql.host,
                port: apiConfig.sql.port,
                user: apiConfig.sql.user,
            password: apiConfig.sql.password,
            database: apiConfig.sql.database,
          }
        });
        Model.knex(knex);
        this.knex = knex;
        console.log("Connected to SQL");
        this.SystemServiceState = ONLINE;    
    }

    async disconnect(){
        this.knex.destroy();

        this.SystemServiceState = OFFLINE;
    }

    async deinit(){
        this.SystemServiceState = UNINIT;
    }

    async getState(){
        switch( this.SystemServiceState ){
            case UNINIT:
                return "UNINIT";
            case INIT:
                return "INIT";
            case ONLINE:
                return "ONLINE";
            case OFFLINE:
                return "OFFLINE";
            default:
                return "UNINIT";
        }
    }
}

module.exports = new SystemServices();