#include <gtest/gtest.h>
#include <memory>
#include "HTTPContext.h"
#include "Web.h"

// Note: These tests use mock implementations to avoid circular dependencies.
// In a real deployment, DashboardAuthService would be used instead.

// Mock implementation of token verification for testing
namespace {
	bool VerifyTokenMock(const std::string& token, std::string& outUsername, uint8_t& outGmLevel) {
		// For testing: valid tokens are prefixed with "valid_"
		if (token.substr(0, 6) == "valid_") {
			outUsername = "testuser";
			outGmLevel = 1;  // GM level 1
			return true;
		}
		if (token == "admin_token") {
			outUsername = "admin";
			outGmLevel = 9;  // GM level 9 (admin)
			return true;
		}
		return false;
	}
}

// Test HTTPContext functionality
class HTTPContextTest : public ::testing::Test {
protected:
	HTTPContext context;
};

TEST_F(HTTPContextTest, DefaultConstructorInitializesFields) {
	EXPECT_FALSE(context.isAuthenticated);
	EXPECT_EQ(context.authenticatedUser, "");
	EXPECT_EQ(context.gmLevel, 0);
	EXPECT_EQ(context.method, "");
	EXPECT_EQ(context.path, "");
	EXPECT_EQ(context.queryString, "");
	EXPECT_EQ(context.body, "");
	EXPECT_EQ(context.clientIP, "");
}

TEST_F(HTTPContextTest, SetHeaderAndGetHeaderCaseInsensitive) {
	context.SetHeader("Content-Type", "application/json");
	EXPECT_EQ(context.GetHeader("Content-Type"), "application/json");
	EXPECT_EQ(context.GetHeader("content-type"), "application/json");
	EXPECT_EQ(context.GetHeader("CONTENT-TYPE"), "application/json");
}

TEST_F(HTTPContextTest, GetHeaderReturnsEmptyStringForMissingHeader) {
	EXPECT_EQ(context.GetHeader("NonExistent"), "");
}

TEST_F(HTTPContextTest, SetHeaderMultipleHeaders) {
	context.SetHeader("Authorization", "Bearer token123");
	context.SetHeader("Cookie", "session=xyz");
	context.SetHeader("User-Agent", "TestClient/1.0");
	
	EXPECT_EQ(context.GetHeader("authorization"), "Bearer token123");
	EXPECT_EQ(context.GetHeader("cookie"), "session=xyz");
	EXPECT_EQ(context.GetHeader("user-agent"), "TestClient/1.0");
}

TEST_F(HTTPContextTest, AuthenticationFields) {
	context.isAuthenticated = true;
	context.authenticatedUser = "testuser";
	context.gmLevel = 5;
	
	EXPECT_TRUE(context.isAuthenticated);
	EXPECT_EQ(context.authenticatedUser, "testuser");
	EXPECT_EQ(context.gmLevel, 5);
}

TEST_F(HTTPContextTest, UserDataMap) {
	context.userData["key1"] = "value1";
	context.userData["key2"] = "value2";
	
	EXPECT_EQ(context.userData["key1"], "value1");
	EXPECT_EQ(context.userData["key2"], "value2");
	EXPECT_TRUE(context.userData.count("key1") > 0);
}

// Test token extraction utilities
namespace TokenExtraction {
	static std::string ExtractTokenFromQueryString(const std::string& queryString) {
		if (queryString.empty()) {
			return "";
		}
		std::string tokenPrefix = "token=";
		size_t tokenPos = queryString.find(tokenPrefix);
		
		if (tokenPos == std::string::npos) {
			return "";
		}
		
		size_t valueStart = tokenPos + tokenPrefix.length();
		size_t valueEnd = queryString.find("&", valueStart);
		
		if (valueEnd == std::string::npos) {
			valueEnd = queryString.length();
		}
		
		return queryString.substr(valueStart, valueEnd - valueStart);
	}
	
	static std::string ExtractTokenFromAuthHeader(const std::string& authHeader) {
		if (authHeader.empty()) {
			return "";
		}
		
		if (authHeader.substr(0, 7) == "Bearer ") {
			return authHeader.substr(7);
		}
		
		if (authHeader.substr(0, 6) == "Token ") {
			return authHeader.substr(6);
		}
		
		return authHeader;
	}
}

// Test token extraction utilities
class TokenExtractionTest : public ::testing::Test {
};

TEST_F(TokenExtractionTest, ExtractFromQueryString) {
	std::string query = "token=mytoken123&other=value";
	std::string token = TokenExtraction::ExtractTokenFromQueryString(query);
	EXPECT_EQ(token, "mytoken123");
}

TEST_F(TokenExtractionTest, ExtractFromQueryStringWithNoOtherParams) {
	std::string query = "token=simpletoken";
	std::string token = TokenExtraction::ExtractTokenFromQueryString(query);
	EXPECT_EQ(token, "simpletoken");
}

TEST_F(TokenExtractionTest, NoTokenInQueryString) {
	std::string query = "other=value&param=test";
	std::string token = TokenExtraction::ExtractTokenFromQueryString(query);
	EXPECT_EQ(token, "");
}

TEST_F(TokenExtractionTest, ExtractFromBearerHeader) {
	std::string header = "Bearer eyJhbGciOiJIUzI1NiJ9";
	std::string token = TokenExtraction::ExtractTokenFromAuthHeader(header);
	EXPECT_EQ(token, "eyJhbGciOiJIUzI1NiJ9");
}

TEST_F(TokenExtractionTest, ExtractFromTokenHeader) {
	std::string header = "Token abc123xyz";
	std::string token = TokenExtraction::ExtractTokenFromAuthHeader(header);
	EXPECT_EQ(token, "abc123xyz");
}

TEST_F(TokenExtractionTest, ExtractRawTokenFromHeader) {
	std::string header = "rawtoken123";
	std::string token = TokenExtraction::ExtractTokenFromAuthHeader(header);
	EXPECT_EQ(token, "rawtoken123");
}

// Test HTTPContext population scenarios
class HTTPContextPopulationTest : public ::testing::Test {
protected:
	HTTPContext context;
};

TEST_F(HTTPContextPopulationTest, PopulateFromRequest) {
	context.method = "POST";
	context.path = "/api/auth/login";
	context.queryString = "token=abc123";
	context.body = "{\"username\":\"test\"}";
	context.clientIP = "192.168.1.100";
	
	EXPECT_EQ(context.method, "POST");
	EXPECT_EQ(context.path, "/api/auth/login");
	EXPECT_EQ(context.queryString, "token=abc123");
	EXPECT_EQ(context.body, "{\"username\":\"test\"}");
	EXPECT_EQ(context.clientIP, "192.168.1.100");
}

TEST_F(HTTPContextPopulationTest, MultipleHeadersWithMixedCase) {
	context.SetHeader("Content-Type", "application/json");
	context.SetHeader("Authorization", "Bearer token");
	context.SetHeader("Accept", "application/json");
	context.SetHeader("User-Agent", "TestClient");
	
	// Verify all headers are accessible case-insensitively
	EXPECT_EQ(context.GetHeader("content-type"), "application/json");
	EXPECT_EQ(context.GetHeader("AUTHORIZATION"), "Bearer token");
	EXPECT_EQ(context.GetHeader("accept"), "application/json");
	EXPECT_EQ(context.GetHeader("USER-AGENT"), "TestClient");
}

// Integration tests for middleware chains
class MiddlewareAuthenticationFlow : public ::testing::Test {
protected:
	HTTPContext context;
	HTTPReply reply;
	
	void SetUp() override {
		reply.status = eHTTPStatusCode::OK;
		reply.contentType = eContentType::APPLICATION_JSON;
		context.path = "/api/test";
		context.clientIP = "127.0.0.1";
		context.method = "GET";
	}
	
	void SimulateTokenVerification(const std::string& token) {
		std::string username;
		uint8_t gmLevel;
		if (VerifyTokenMock(token, username, gmLevel)) {
			context.isAuthenticated = true;
			context.authenticatedUser = username;
			context.gmLevel = gmLevel;
		}
	}
};

TEST_F(MiddlewareAuthenticationFlow, SuccessfulAuthenticationWithQueryToken) {
	context.queryString = "token=valid_token123";
	
	// Extract token
	std::string token = TokenExtraction::ExtractTokenFromQueryString(context.queryString);
	EXPECT_EQ(token, "valid_token123");
	
	// Verify token
	SimulateTokenVerification(token);
	
	EXPECT_TRUE(context.isAuthenticated);
	EXPECT_EQ(context.authenticatedUser, "testuser");
	EXPECT_EQ(context.gmLevel, 1);
}

TEST_F(MiddlewareAuthenticationFlow, SuccessfulAuthenticationWithBearerToken) {
	context.SetHeader("Authorization", "Bearer admin_token");
	
	// Extract token
	std::string authHeader = context.GetHeader("Authorization");
	std::string token = TokenExtraction::ExtractTokenFromAuthHeader(authHeader);
	EXPECT_EQ(token, "admin_token");
	
	// Verify token
	SimulateTokenVerification(token);
	
	EXPECT_TRUE(context.isAuthenticated);
	EXPECT_EQ(context.authenticatedUser, "admin");
	EXPECT_EQ(context.gmLevel, 9);
}

TEST_F(MiddlewareAuthenticationFlow, FailedAuthenticationInvalidToken) {
	context.queryString = "token=invalid_token";
	
	// Extract token
	std::string token = TokenExtraction::ExtractTokenFromQueryString(context.queryString);
	EXPECT_EQ(token, "invalid_token");
	
	// Verify token
	SimulateTokenVerification(token);
	
	EXPECT_FALSE(context.isAuthenticated);
	EXPECT_EQ(context.authenticatedUser, "");
	EXPECT_EQ(context.gmLevel, 0);
}

TEST_F(MiddlewareAuthenticationFlow, NoTokenProvided) {
	context.queryString = "";
	
	// Extract token (none provided)
	std::string token = TokenExtraction::ExtractTokenFromQueryString(context.queryString);
	EXPECT_EQ(token, "");
	
	// Should remain unauthenticated
	EXPECT_FALSE(context.isAuthenticated);
	EXPECT_EQ(context.authenticatedUser, "");
	EXPECT_EQ(context.gmLevel, 0);
}

// Test authorization level checking
class AuthorizationLevelTest : public ::testing::Test {
protected:
	uint8_t CheckMinimumGMLevel(uint8_t userLevel, uint8_t requiredLevel) {
		return userLevel >= requiredLevel ? 1 : 0;  // 1 = allowed, 0 = forbidden
	}
};

TEST_F(AuthorizationLevelTest, UserCanAccessWithSufficientLevel) {
	EXPECT_EQ(CheckMinimumGMLevel(9, 5), 1);  // Admin (9) can access level 5
	EXPECT_EQ(CheckMinimumGMLevel(5, 5), 1);  // Level 5 can access level 5
	EXPECT_EQ(CheckMinimumGMLevel(0, 0), 1);  // Level 0 can access level 0
}

TEST_F(AuthorizationLevelTest, UserCannotAccessWithInsufficientLevel) {
	EXPECT_EQ(CheckMinimumGMLevel(2, 5), 0);  // Level 2 cannot access level 5
	EXPECT_EQ(CheckMinimumGMLevel(0, 1), 0);  // Level 0 cannot access level 1
	EXPECT_EQ(CheckMinimumGMLevel(3, 9), 0);  // Level 3 cannot access admin (9)
}

// Test error response formatting
class ErrorResponseTest : public ::testing::Test {
protected:
	HTTPReply reply;
};

TEST_F(ErrorResponseTest, UnauthorizedResponse) {
	reply.status = eHTTPStatusCode::UNAUTHORIZED;
	reply.message = "{\"error\":\"Unauthorized - Authentication required\"}";
	reply.contentType = eContentType::APPLICATION_JSON;
	
	EXPECT_EQ(reply.status, eHTTPStatusCode::UNAUTHORIZED);
	EXPECT_NE(reply.message.find("Unauthorized"), std::string::npos);
	EXPECT_EQ(reply.contentType, eContentType::APPLICATION_JSON);
}

TEST_F(ErrorResponseTest, ForbiddenResponse) {
	reply.status = eHTTPStatusCode::FORBIDDEN;
	reply.message = "{\"error\":\"Forbidden - Insufficient permissions\"}";
	reply.contentType = eContentType::APPLICATION_JSON;
	
	EXPECT_EQ(reply.status, eHTTPStatusCode::FORBIDDEN);
	EXPECT_NE(reply.message.find("Forbidden"), std::string::npos);
	EXPECT_EQ(reply.contentType, eContentType::APPLICATION_JSON);
}

TEST_F(ErrorResponseTest, OkResponse) {
	reply.status = eHTTPStatusCode::OK;
	reply.message = "{\"status\":\"success\",\"data\":{}}";
	reply.contentType = eContentType::APPLICATION_JSON;
	
	EXPECT_EQ(reply.status, eHTTPStatusCode::OK);
	EXPECT_EQ(reply.contentType, eContentType::APPLICATION_JSON);
}