package sqlite

import (
	"errors"

	sqlite3 "modernc.org/sqlite"
)

// SQLite extended result codes for the two constraint failures that mean
// "that row is already there". The driver reports them numerically and does
// not re-export the constants, so they are named here rather than left as
// magic numbers at the call site.
const (
	constraintUnique     = 2067 // SQLITE_CONSTRAINT_UNIQUE
	constraintPrimaryKey = 1555 // SQLITE_CONSTRAINT_PRIMARYKEY
)

// isUniqueViolation reports whether err is SQLite complaining about a
// duplicate key.
func isUniqueViolation(err error) bool {
	var sqlErr *sqlite3.Error
	if !errors.As(err, &sqlErr) {
		return false
	}
	switch sqlErr.Code() {
	case constraintUnique, constraintPrimaryKey:
		return true
	default:
		return false
	}
}