// Package valueobjects provides domain value objects for the KnowFoolery application.
package valueobjects

// Scoring constants
const (
	// MaxScorePerQuestion is the maximum score for a correct answer without hint.
	MaxScorePerQuestion = 2
	// ScoreWithHint is the score for a correct answer with hint.
	ScoreWithHint = 1
	// ScoreIncorrect is the score for an incorrect answer.
	ScoreIncorrect = 0
	// MaxAttempts is the maximum number of attempts per question.
	MaxAttempts = 3
)

// Score represents a game score value.
type Score struct {
	value int
}

// NewScore creates a new Score with validation.
func NewScore(value int) Score {
	if value < 0 {
		value = 0
	}
	return Score{value: value}
}

// Zero returns a zero score.
func Zero() Score {
	return Score{value: 0}
}

// Value returns the score value.
func (s Score) Value() int {
	return s.value
}

// Add adds points to the score and returns a new Score.
func (s Score) Add(points int) Score {
	newValue := s.value + points
	if newValue < 0 {
		newValue = 0
	}
	return Score{value: newValue}
}

// CalculateQuestionScore calculates the score for a question based on correctness and hint usage.
func CalculateQuestionScore(isCorrect bool, usedHint bool) int {
	if !isCorrect {
		return ScoreIncorrect
	}
	if usedHint {
		return ScoreWithHint
	}
	return MaxScorePerQuestion
}

// Attempt represents an attempt at answering a question.
type Attempt struct {
	Number   int
	Answer   string
	Correct  bool
	UsedHint bool
	Score    int
}

// NewAttempt creates a new Attempt.
func NewAttempt(number int, answer string, correct bool, usedHint bool) Attempt {
	return Attempt{
		Number:   number,
		Answer:   answer,
		Correct:  correct,
		UsedHint: usedHint,
		Score:    CalculateQuestionScore(correct, usedHint),
	}
}

// CanRetry checks if another attempt is allowed.
func CanRetry(attemptNumber int) bool {
	return attemptNumber < MaxAttempts
}

// RemainingAttempts returns the number of remaining attempts.
func RemainingAttempts(attemptNumber int) int {
	remaining := MaxAttempts - attemptNumber
	if remaining < 0 {
		return 0
	}
	return remaining
}