package domain

import "errors"

var (
	ErrNotFound = errors.New("resource not found")
	ErrLastList = errors.New("the last remaining list cannot be deleted")
)

// ValidationError represents a user-correctable domain validation failure.
type ValidationError struct{ Message string }

func (e ValidationError) Error() string { return e.Message }

type List struct {
	ID        int64   `json:"id"`
	Name      string  `json:"name"`
	Position  float64 `json:"position"`
	CardCount int     `json:"card_count,omitempty"`
}

type Card struct {
	ID          int64   `json:"id"`
	ListID      int64   `json:"list_id"`
	Title       string  `json:"title"`
	Description string  `json:"description"`
	Position    float64 `json:"position"`
	CreatedAt   string  `json:"created_at"`
	UpdatedAt   string  `json:"updated_at"`
}

type ListWithCards struct {
	ID       int64   `json:"id"`
	Name     string  `json:"name"`
	Position float64 `json:"position"`
	Cards    []Card  `json:"cards"`
}

type Snapshot struct {
	Lists []ListWithCards `json:"lists"`
}