package domain

import (
	"database/sql"
	"time"

	"github.com/google/uuid"
)

type TodoStatus string

const (
	StatusPending    TodoStatus = "pending"
	StatusInProgress TodoStatus = "in-progress"
	StatusCompleted  TodoStatus = "completed"
)

type Todo struct {
	ID          uuid.UUID   `json:"id"`
	UserID      uuid.UUID   `json:"userId"`
	Title       string      `json:"title"`
	Description *string     `json:"description"` // Nullable
	Status      TodoStatus  `json:"status"`
	Deadline    *time.Time  `json:"deadline"`    // Nullable
	TagIDs      []uuid.UUID `json:"tagIds"`      // Populated after fetching
	Tags        []Tag       `json:"-"`           // Can hold full tag objects if needed, loaded separately
	Attachments []string    `json:"attachments"` // Stores identifiers (e.g., file IDs or URLs)
	Subtasks    []Subtask   `json:"subtasks"`    // Populated after fetching
	CreatedAt   time.Time   `json:"createdAt"`
	UpdatedAt   time.Time   `json:"updatedAt"`
}

func NullStringToStringPtr(ns sql.NullString) *string {
	if ns.Valid {
		return &ns.String
	}
	return nil
}

func NullTimeToTimePtr(nt sql.NullTime) *time.Time {
	if nt.Valid {
		return &nt.Time
	}
	return nil
}