package entry

import (
	"errors"
	"time"
)

var (
	ErrEntryNotFound   = errors.New("entry not found")
	ErrInvalidEntry    = errors.New("invalid entry")
	ErrUniqueViolation = errors.New("a unique value is already used")
	ErrInvalidSort     = errors.New("invalid sort")
	ErrInvalidPage     = errors.New("invalid page")
)

const (
	MaxPage     = 1000000
	MaxPageSize = 100
)

func ValidatePage(page int, size int) error {
	if page > MaxPage || size > MaxPageSize {
		return ErrInvalidPage
	}
	return nil
}

const (
	RuleRequired     = "required"
	RuleUnknownField = "unknown_field"
	RuleUnique       = "unique"
)

type Entry struct {
	ID            uint32         `json:"id"`
	ContentTypeID uint32         `json:"content_type_id"`
	Data          map[string]any `json:"data"`
	CreatedBy     uint32         `json:"created_by"`
	UpdatedBy     uint32         `json:"updated_by"`
	CreatedAt     time.Time      `json:"created_at"`
	UpdatedAt     time.Time      `json:"updated_at"`
}

type FieldError struct {
	Key   string
	Rule  string
	Cause error
}

func (e FieldError) Error() string {
	return e.Key + ": " + e.Rule
}

func (e FieldError) Unwrap() error {
	return e.Cause
}

func invalidField(key string, rule string) error {
	return FieldError{Key: key, Rule: rule, Cause: ErrInvalidEntry}
}

func UniqueViolation(key string) error {
	return FieldError{Key: key, Rule: RuleUnique, Cause: ErrUniqueViolation}
}