package question

import "time"

// Difficulty represents the question difficulty level.
type Difficulty string

const (
	DifficultyEasy   Difficulty = "easy"
	DifficultyMedium Difficulty = "medium"
	DifficultyHard   Difficulty = "hard"
)

// Question represents a question aggregate root.
type Question struct {
	ID         string
	Theme      string
	Text       string
	Answer     string
	Hint       string
	Difficulty Difficulty
	IsActive   bool
	CreatedAt  time.Time
	UpdatedAt  time.Time
}

// RandomFilter defines supported filters for random question retrieval.
type RandomFilter struct {
	ExcludeQuestionIDs []string
	Theme              string
	Difficulty         Difficulty
}

// IsValidDifficulty checks whether difficulty is supported.
func IsValidDifficulty(d Difficulty) bool {
	switch d {
	case DifficultyEasy, DifficultyMedium, DifficultyHard:
		return true
	default:
		return false
	}
}