package tdb

import (
	"errors"
	"fmt"
	"strings"
)

var (
	ConstraintValidated ConstraintValidationStatus = true
	ConstraintViolation ConstraintValidationStatus = false
)

type ConstraintValidationStatus bool

type ConstraintOptions struct {
	Table   string
	Field   string
	Foreign string
	NotNull bool
}

type constraintish interface {
	validate(tx *Tx, val dbPtrValue) error
}

type constraints []constraintish

func (c constraints) validate(tx *Tx, val dbPtrValue) error {
	errs := make([]error, 0)
	for _, constraint := range c {
		if err := constraint.validate(tx, val); err != nil {
			errs = append(errs, err)
		}
	}

	errLen := len(errs)
	if errLen == 0 {
		return nil
	}

	sb := &strings.Builder{}
	sb.WriteString(fmt.Sprintf("%d constraint violation errors:", errLen))
	for _, e := range errs {
		sb.WriteString("\n")
		sb.WriteString(e.Error())
	}
	return errors.New(sb.String())
}