package storage

import (
	"errors"
	"fmt"

	"modernc.org/sqlite"
)

var (
	ErrInvalid       = errors.New("storage: invalid input")
	ErrNotFound      = errors.New("storage: not found")
	ErrConflict      = errors.New("storage: conflict")
	ErrUIDExhausted  = errors.New("storage: uid range exhausted")
	ErrGIDExhausted  = errors.New("storage: gid range exhausted")
	ErrSchemaTooNew  = errors.New("storage: schema newer than binary")
	ErrSchemaInvalid = errors.New("storage: schema invalid")
	ErrBusy          = errors.New("storage: database busy")
	ErrLocked        = errors.New("storage: database locked")
	ErrClosed        = errors.New("storage: closed")
)

func invalid(operation string, err error) error {
	return fmt.Errorf("%s: %w: %v", operation, ErrInvalid, err)
}

func classify(operation string, err error) error {
	if err == nil {
		return nil
	}
	var sqliteErr *sqlite.Error
	if errors.As(err, &sqliteErr) {
		switch sqliteErr.Code() & 0xff {
		case 5:
			return fmt.Errorf("%s: %w: %w", operation, ErrBusy, err)
		case 6:
			return fmt.Errorf("%s: %w: %w", operation, ErrLocked, err)
		case 19:
			return fmt.Errorf("%s: %w: %w", operation, ErrConflict, err)
		}
	}
	return fmt.Errorf("%s: %w", operation, err)
}