package boil

import (
	"database/sql"
	"os"
)

type Executor interface {
	Exec(query string, args ...interface{}) (sql.Result, error)
	Query(query string, args ...interface{}) (*sql.Rows, error)
	QueryRow(query string, args ...interface{}) *sql.Row
}

type Transactor interface {
	Commit() error
	Rollback() error

	Executor
}

type Creator interface {
	Begin() (*sql.Tx, error)
}

var currentDB Executor

// DebugMode is a flag controlling whether generated sql statements and
// debug information is outputted to the DebugWriter handle
//
// NOTE: This should be disabled in production to avoid leaking sensitive data
var DebugMode = false

// DebugWriter is where the debug output will be sent if DebugMode is true
var DebugWriter = os.Stdout

func Begin() (Transactor, error) {
	creator, ok := currentDB.(Creator)
	if !ok {
		panic("Your database does not support transactions.")
	}

	return creator.Begin()
}

// SetDB initializes the database handle for all template db interactions
func SetDB(db Executor) {
	currentDB = db
}

// GetDB retrieves the global state database handle
func GetDB() Executor {
	return currentDB
}