package services

import (
	"context"
	"fmt"

	"go.uber.org/zap"

	"github.com/kms/api-key-service/internal/config"
)

// authenticationService implements the AuthenticationService interface
type authenticationService struct {
	config config.ConfigProvider
	logger *zap.Logger
}

// NewAuthenticationService creates a new authentication service
func NewAuthenticationService(config config.ConfigProvider, logger *zap.Logger) AuthenticationService {
	return &authenticationService{
		config: config,
		logger: logger,
	}
}

// GetUserID extracts user ID from context
func (s *authenticationService) GetUserID(ctx context.Context) (string, error) {
	// For now, this is a simple implementation
	// In a real implementation, this would extract from JWT tokens, session, etc.
	
	if userID, ok := ctx.Value("user_id").(string); ok {
		return userID, nil
	}
	
	return "", fmt.Errorf("user ID not found in context")
}

// ValidatePermissions checks if user has required permissions
func (s *authenticationService) ValidatePermissions(ctx context.Context, userID string, appID string, requiredPermissions []string) error {
	s.logger.Debug("Validating permissions", 
		zap.String("user_id", userID), 
		zap.String("app_id", appID), 
		zap.Strings("required_permissions", requiredPermissions))

	// TODO: Implement actual permission validation
	// For now, we'll just allow all requests
	
	return nil
}

// GetUserClaims retrieves user claims
func (s *authenticationService) GetUserClaims(ctx context.Context, userID string) (map[string]string, error) {
	s.logger.Debug("Getting user claims", zap.String("user_id", userID))

	// TODO: Implement actual claims retrieval
	// For now, return basic claims
	
	claims := map[string]string{
		"user_id": userID,
		"email":   userID, // Assuming user_id is email for now
		"name":    "Test User",
	}
	
	return claims, nil
}