package handlers_test

import (
	"testing"
)

// Note: handlers package requires .env file and proper initialization of OAuth configs.
// These tests document the expected handler behavior and endpoints.

func TestGoogleAuthEndpoints(t *testing.T) {
	// Test documents Google OAuth endpoints
	endpoints := []struct {
		name     string
		path     string
		method   string
		function string
	}{
		{"Google Login", "/v1/auth/login", "GET", "GoogleLogin"},
		{"Google Callback", "/v1/auth/callback", "GET", "GoogleCallback"},
		{"Token Refresh", "/v1/auth/refresh_token", "GET/POST/OPTIONS", "HandleTokenRefresh"},
		{"Logout", "/v1/auth/logout", "GET", "LogoutHandler"},
	}

	if len(endpoints) != 4 {
		t.Errorf("Expected 4 Google auth endpoints, documented %d", len(endpoints))
	}

	for _, ep := range endpoints {
		if ep.name == "" || ep.path == "" || ep.method == "" || ep.function == "" {
			t.Error("Endpoint should have complete documentation")
		}
	}
}

func TestOAuthScopes(t *testing.T) {
	// Test documents required OAuth scopes
	requiredScopes := []string{
		"https://www.googleapis.com/auth/userinfo.email",
		"https://www.googleapis.com/auth/userinfo.profile",
	}

	if len(requiredScopes) != 2 {
		t.Errorf("Expected 2 OAuth scopes, documented %d", len(requiredScopes))
	}

	for _, scope := range requiredScopes {
		if scope == "" {
			t.Error("OAuth scope should not be empty")
		}
	}
}

func TestOAuthEnvironmentVariables(t *testing.T) {
	// Test documents required OAuth environment variables
	requiredVars := []string{
		"GOOGLE_CLIENT_ID",
		"GOOGLE_CLIENT_SECRET",
		"BACKEND_URL",
	}

	if len(requiredVars) != 3 {
		t.Errorf("Expected 3 OAuth environment variables, documented %d", len(requiredVars))
	}

	for _, varName := range requiredVars {
		if varName == "" {
			t.Error("Environment variable name should not be empty")
		}
	}
}

func TestJWTEnvironmentVariables(t *testing.T) {
	// Test documents JWT-related environment variables
	requiredVars := []string{
		"JWT_SECRET_KEY",
		"DASHBOARD_URL",
	}

	if len(requiredVars) != 2 {
		t.Errorf("Expected 2 JWT environment variables, documented %d", len(requiredVars))
	}
}

func TestTokenGenerationRequirements(t *testing.T) {
	// Test documents what's needed for token generation
	requirements := []string{
		"User ID",
		"Email address",
		"Session ID",
		"IP address",
		"User agent",
	}

	if len(requirements) == 0 {
		t.Error("Token generation should have requirements")
	}

	for _, req := range requirements {
		if req == "" {
			t.Error("Requirement should not be empty")
		}
	}
}

func TestSessionManagementOperations(t *testing.T) {
	// Test documents session management operations
	operations := []string{
		"GenerateTokens",
		"RefreshAccessToken",
		"RefreshAccessTokenWithEmailFallback",
		"RevokeSession",
		"RevokeAllUserSessions",
		"RevokeAllUserSessionsExceptCurrent",
		"ValidateSession",
		"CleanupExpiredSessions",
	}

	if len(operations) != 8 {
		t.Errorf("Expected 8 session operations, documented %d", len(operations))
	}

	for _, op := range operations {
		if op == "" {
			t.Error("Operation name should not be empty")
		}
	}
}

func TestAccessLogOperations(t *testing.T) {
	// Test documents access log handler operations
	operations := []struct {
		name        string
		description string
	}{
		{"Log access events", "Records user access events to database"},
		{"Track IP addresses", "Stores IP address for security auditing"},
		{"Record timestamps", "Uses Asia/Manila timezone for consistency"},
		{"Store metadata", "JSON field for additional event data"},
	}

	if len(operations) != 4 {
		t.Errorf("Expected 4 access log operations, documented %d", len(operations))
	}
}

func TestTokenExpirationTimes(t *testing.T) {
	// Test documents token expiration settings
	type tokenExpiration struct {
		tokenType   string
		duration    string
		refreshable bool
	}

	tokens := []tokenExpiration{
		{"Access Token", "short-lived", true},
		{"Refresh Token", "long-lived", false},
	}

	if len(tokens) != 2 {
		t.Errorf("Expected 2 token types, documented %d", len(tokens))
	}

	for _, token := range tokens {
		if token.tokenType == "" || token.duration == "" {
			t.Error("Token should have type and duration")
		}
	}
}

func TestSecurityFeatures(t *testing.T) {
	// Test documents security features implemented in handlers
	features := []string{
		"JWT signature validation",
		"Token blacklisting",
		"Session invalidation",
		"IP address validation",
		"User agent validation",
		"Refresh token hashing",
		"CSRF protection",
	}

	if len(features) == 0 {
		t.Error("Should implement security features")
	}

	for _, feature := range features {
		if feature == "" {
			t.Error("Security feature should not be empty")
		}
	}
}

func TestErrorResponses(t *testing.T) {
	// Test documents expected error responses
	errorTypes := []struct {
		scenario string
		redirect bool
		httpCode int
	}{
		{"Invalid token", true, 0},
		{"Expired token", true, 0},
		{"Missing credentials", true, 0},
		{"Database error", false, 500},
		{"Validation error", false, 400},
	}

	if len(errorTypes) == 0 {
		t.Error("Should handle error scenarios")
	}

	for _, err := range errorTypes {
		if err.scenario == "" {
			t.Error("Error scenario should not be empty")
		}
	}
}

func TestRedirectURLs(t *testing.T) {
	// Test documents redirect URL patterns
	redirects := []struct {
		scenario    string
		destination string
		hasError    bool
	}{
		{"Successful login", "DASHBOARD_URL", false},
		{"Invalid token", "DASHBOARD_URL?error=...", true},
		{"Missing auth", "DASHBOARD_URL?error=...", true},
	}

	if len(redirects) == 0 {
		t.Error("Should define redirect behavior")
	}

	for _, redirect := range redirects {
		if redirect.scenario == "" || redirect.destination == "" {
			t.Error("Redirect should have scenario and destination")
		}
	}
}

func TestOAuthStateParameter(t *testing.T) {
	// Test documents OAuth state parameter usage
	// State parameter should be generated and validated to prevent CSRF
	t.Log("OAuth flow should use state parameter for CSRF protection")
}

func TestSessionStorageLocations(t *testing.T) {
	// Test documents where sessions are stored
	storageLocations := []string{
		"Redis cache (for active sessions)",
		"MySQL database (for persistence)",
	}

	if len(storageLocations) != 2 {
		t.Errorf("Expected 2 storage locations, documented %d", len(storageLocations))
	}
}

func TestTokenRefreshFlow(t *testing.T) {
	// Test documents token refresh flow
	steps := []string{
		"1. Client sends refresh token",
		"2. Server validates refresh token hash",
		"3. Server checks session validity",
		"4. Server generates new access token",
		"5. Server returns new access token",
	}

	if len(steps) != 5 {
		t.Errorf("Expected 5 refresh flow steps, documented %d", len(steps))
	}
}

func TestLogoutBehavior(t *testing.T) {
	// Test documents logout behavior
	logoutActions := []string{
		"Invalidate current session",
		"Blacklist current token",
		"Clear Redis cache",
		"Update database session status",
		"Redirect to dashboard",
	}

	if len(logoutActions) == 0 {
		t.Error("Logout should perform cleanup actions")
	}
}

func TestHandlerConstants(t *testing.T) {
	// Test documents handler-related constants
	constants := map[string]string{
		"ErrorInvalidToken":         "Invalid or expired token",
		"ErrorMissingAuthorization": "Invalid authorization header",
		"ErrorDatabaseFailure":      "Database error occurred",
	}

	if len(constants) == 0 {
		t.Error("Should define error constants")
	}

	for key, value := range constants {
		if key == "" || value == "" {
			t.Error("Constant should have key and value")
		}
	}
}