package blossom

import (
	"net/http"
)

// PaymentChecker handles payment requirements (BUD-07)
type PaymentChecker struct {
	// Payment configuration would go here
	// For now, this is a placeholder
}

// NewPaymentChecker creates a new payment checker
func NewPaymentChecker() *PaymentChecker {
	return &PaymentChecker{}
}

// CheckPaymentRequired checks if payment is required for an endpoint
// Returns payment method headers if payment is required
func (pc *PaymentChecker) CheckPaymentRequired(
	endpoint string,
) (required bool, paymentHeaders map[string]string) {
	// Placeholder implementation - always returns false
	// In a real implementation, this would check:
	// - Per-endpoint payment requirements
	// - User payment status
	// - Blob size/cost thresholds
	// etc.
	
	return false, nil
}

// ValidatePayment validates a payment proof
func (pc *PaymentChecker) ValidatePayment(
	paymentMethod, proof string,
) (valid bool, err error) {
	// Placeholder implementation
	// In a real implementation, this would validate:
	// - Cashu tokens (NUT-24)
	// - Lightning payment preimages (BOLT-11)
	// etc.
	
	return true, nil
}

// SetPaymentRequired sets a 402 Payment Required response with payment headers
func SetPaymentRequired(w http.ResponseWriter, paymentHeaders map[string]string) {
	for header, value := range paymentHeaders {
		w.Header().Set(header, value)
	}
	w.WriteHeader(http.StatusPaymentRequired)
}