package sqldb

import (
	"database/sql"
	"fmt"
	"officeHours/config"

	_ "github.com/go-sql-driver/mysql"
	_ "github.com/mattn/go-sqlite3"
)

// Connect to a database using or throw an error
func Connect(config config.Config) (*sql.DB, error) {
	switch config.SQL.Type {
	case "SQLite":
		return connectSQLite(config.SQL.SQLiteFile)
	case "Mysql":
		return connectMysql(config.SQL.MysqlUser,
			config.SQL.MysqlPassword,
			config.SQL.MysqlHost,
			config.SQL.MysqlPort,
			config.SQL.MysqlDatabase)
	default:
		return nil, fmt.Errorf("Type of database not recognised: %s", config.SQL.Type)
	}
}

// Connect to a SQLite database and check the connection.
func connectSQLite(file string) (*sql.DB, error) {
	db, err := sql.Open("sqlite3", file)
	if err != nil {
		return db, fmt.Errorf("Error opening SQLite database: %w", err)
	}
	return db, nil
}

// Connect to a Mysql database and check the connection.
func connectMysql(user string, password string, address string, port int, database string) (*sql.DB, error) {
	db, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s:%d)/%s", user, password, address, port, database))
	if err != nil {
		return db, fmt.Errorf("Error connecting to Mysql database: %w", err)
	}

	err = db.Ping()
	if err != nil {
		return db, fmt.Errorf("Error pinging Mysql database: %w", err)
	}
	return db, nil
}