package oauth

import (
	"context"

	"github.com/yaoapp/yao/openapi/oauth/types"
)

// GenerateCodeChallenge generates a code challenge from a code verifier
// This is used for PKCE (Proof Key for Code Exchange) flow
func (s *Service) GenerateCodeChallenge(ctx context.Context, codeVerifier string, method string) (string, error) {
	// TODO: Implement code challenge generation
	return "", nil
}

// ValidateCodeChallenge validates a code verifier against a code challenge
// This verifies the PKCE code challenge during token exchange
func (s *Service) ValidateCodeChallenge(ctx context.Context, codeVerifier string, codeChallenge string, method string) error {
	// TODO: Implement code challenge validation
	return nil
}

// ValidateStateParameter validates OAuth state parameters
// This prevents CSRF attacks by verifying state parameters
func (s *Service) ValidateStateParameter(ctx context.Context, state string, clientID string) (*types.ValidationResult, error) {
	// TODO: Implement state parameter validation
	return nil, nil
}

// GenerateStateParameter generates a secure state parameter
// This creates cryptographically secure state values for CSRF protection
func (s *Service) GenerateStateParameter(ctx context.Context, clientID string) (*types.StateParameter, error) {
	// TODO: Implement state parameter generation
	return nil, nil
}

// ValidateRedirectURI validates redirect URIs against registered URIs
func (s *Service) ValidateRedirectURI(ctx context.Context, redirectURI string, registeredURIs []string) (*types.ValidationResult, error) {
	// This method signature doesn't match our ClientProvider interface
	// We need the clientID to validate, so let's assume we can extract it from context
	// or we need to modify the interface
	return &types.ValidationResult{Valid: true}, nil
}

// PushAuthorizationRequest processes a pushed authorization request
// This implements RFC 9126 for enhanced security
func (s *Service) PushAuthorizationRequest(ctx context.Context, request *types.PushedAuthorizationRequest) (*types.PushedAuthorizationResponse, error) {
	// TODO: Implement pushed authorization request
	return nil, nil
}