#include "app/WebHandlers.hpp"
#include "rpc/Errors.hpp"
#include "rpc/WorkQueue.hpp"
#include "util/AsioContextTestFixture.hpp"
#include "util/MockLedgerCache.hpp"
#include "util/MockPrometheus.hpp"
#include "util/Taggable.hpp"
#include "util/config/ConfigDefinition.hpp"
#include "util/config/ConfigValue.hpp"
#include "util/config/Types.hpp"
#include "web/AdminVerificationStrategy.hpp"
#include "web/SubscriptionContextInterface.hpp"
#include "web/dosguard/DOSGuardMock.hpp"
#include "web/ng/Connection.hpp"
#include "web/ng/MockConnection.hpp"
#include "web/ng/Request.hpp"
#include "web/ng/Response.hpp"

#include <boost/asio/spawn.hpp>
#include <boost/beast/core/flat_buffer.hpp>
#include <boost/beast/http/message.hpp>
#include <boost/beast/http/status.hpp>
#include <boost/beast/http/string_body.hpp>
#include <boost/beast/http/verb.hpp>
#include <boost/json/parse.hpp>
#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include <memory>
#include <stdexcept>
#include <string>
#include <string_view>
#include <utility>

using namespace app;
namespace http = boost::beast::http;
using namespace util::config;

struct WebHandlersTest : virtual public ::testing::Test {
    DOSGuardStrictMock dosGuardMock;
    util::TagDecoratorFactory const tagFactory{ClioConfigDefinition{
        {"log.tag_style", ConfigValue{ConfigType::String}.defaultValue("uint")}
    }};
    std::string const ip = "some ip";
    StrictMockConnection connectionMock{ip, boost::beast::flat_buffer{}, tagFactory};

    struct AdminVerificationStrategyMock : web::AdminVerificationStrategy {
        MOCK_METHOD(bool, isAdmin, (RequestHeader const&, std::string_view), (const, override));
    };
    using AdminVerificationStrategyStrictMockPtr =
        std::shared_ptr<testing::StrictMock<AdminVerificationStrategyMock>>;
};

struct OnConnectCheckTests : WebHandlersTest {
    OnConnectCheck onConnectCheck{dosGuardMock};
};

TEST_F(OnConnectCheckTests, Ok)
{
    EXPECT_CALL(dosGuardMock, increment(ip));
    EXPECT_CALL(dosGuardMock, isOk(ip)).WillOnce(testing::Return(true));
    EXPECT_TRUE(onConnectCheck(connectionMock).has_value());
}

TEST_F(OnConnectCheckTests, RateLimited)
{
    EXPECT_CALL(dosGuardMock, increment(ip));
    EXPECT_CALL(dosGuardMock, isOk(ip)).WillOnce(testing::Return(false));
    EXPECT_CALL(connectionMock, wasUpgraded).WillOnce(testing::Return(false));

    auto response = onConnectCheck(connectionMock);
    ASSERT_FALSE(response.has_value());
    auto const httpResponse = std::move(response).error().intoHttpResponse();
    EXPECT_EQ(httpResponse.result(), boost::beast::http::status::too_many_requests);
    EXPECT_EQ(httpResponse.body(), "Too many requests");
}

struct IpChangeHookTests : WebHandlersTest {
    IpChangeHook ipChangeHook{dosGuardMock};
};

TEST_F(IpChangeHookTests, CallsDecrementAndIncrement)
{
    std::string const oldIp = "old ip";
    std::string const newIp = "new ip";

    EXPECT_CALL(dosGuardMock, decrement(oldIp));
    EXPECT_CALL(dosGuardMock, increment(newIp));

    ipChangeHook(oldIp, newIp);
}

struct DisconnectHookTests : WebHandlersTest {
    DisconnectHook disconnectHook{dosGuardMock};
};

TEST_F(DisconnectHookTests, CallsDecrement)
{
    EXPECT_CALL(dosGuardMock, decrement(ip));
    disconnectHook(connectionMock);
}

struct MetricsHandlerTests : util::prometheus::WithPrometheus,
                             SyncAsioContextTest,
                             WebHandlersTest {
    AdminVerificationStrategyStrictMockPtr adminVerifier{
        std::make_shared<testing::StrictMock<AdminVerificationStrategyMock>>()
    };

    rpc::WorkQueue workQueue{1};

    MetricsHandler metricsHandler{adminVerifier, workQueue};
    web::ng::Request request{http::request<http::string_body>{http::verb::get, "/metrics", 11}};
};

TEST_F(MetricsHandlerTests, Call)
{
    EXPECT_CALL(*adminVerifier, isAdmin).WillOnce(testing::Return(true));
    runSpawn([&](boost::asio::yield_context yield) {
        auto response = metricsHandler(request, connectionMock, nullptr, yield);
        auto const httpResponse = std::move(response).intoHttpResponse();
        EXPECT_EQ(httpResponse.result(), boost::beast::http::status::ok);
    });
}

struct HealthCheckHandlerTests : SyncAsioContextTest, WebHandlersTest {
    web::ng::Request request{http::request<http::string_body>{http::verb::get, "/", 11}};
    HealthCheckHandler healthCheckHandler;
};

TEST_F(HealthCheckHandlerTests, Call)
{
    runSpawn([&](boost::asio::yield_context yield) {
        auto response = healthCheckHandler(request, connectionMock, nullptr, yield);
        auto const httpResponse = std::move(response).intoHttpResponse();
        EXPECT_EQ(httpResponse.result(), boost::beast::http::status::ok);
    });
}

struct CacheStateHandlerTests : SyncAsioContextTest, WebHandlersTest {
    web::ng::Request request{http::request<http::string_body>{http::verb::get, "/", 11}};
    MockLedgerCache cache;
    CacheStateHandler cacheStateHandler{cache};
};

TEST_F(CacheStateHandlerTests, CallWithCacheLoaded)
{
    EXPECT_CALL(cache, isFull()).WillRepeatedly(testing::Return(true));
    runSpawn([&](boost::asio::yield_context yield) {
        auto response = cacheStateHandler(request, connectionMock, nullptr, yield);
        auto const httpResponse = std::move(response).intoHttpResponse();
        EXPECT_EQ(httpResponse.result(), boost::beast::http::status::ok);
    });
}

TEST_F(CacheStateHandlerTests, CallWithoutCacheLoaded)
{
    EXPECT_CALL(cache, isFull()).WillRepeatedly(testing::Return(false));
    runSpawn([&](boost::asio::yield_context yield) {
        auto response = cacheStateHandler(request, connectionMock, nullptr, yield);
        auto const httpResponse = std::move(response).intoHttpResponse();
        EXPECT_EQ(httpResponse.result(), boost::beast::http::status::service_unavailable);
    });
}

struct RequestHandlerTest : SyncAsioContextTest, WebHandlersTest {
    AdminVerificationStrategyStrictMockPtr adminVerifier{
        std::make_shared<testing::StrictMock<AdminVerificationStrategyMock>>()
    };

    struct RpcHandlerMock {
        MOCK_METHOD(
            web::ng::Response,
            call,
            (web::ng::Request const&,
             web::ng::ConnectionMetadata const&,
             web::SubscriptionContextPtr,
             boost::asio::yield_context),
            ()
        );

        web::ng::Response
        operator()(
            web::ng::Request const& request,
            web::ng::ConnectionMetadata const& connectionMetadata,
            web::SubscriptionContextPtr subscriptionContext,
            boost::asio::yield_context yield
        )
        {
            return call(request, connectionMetadata, std::move(subscriptionContext), yield);
        }
    };

    testing::StrictMock<RpcHandlerMock> rpcHandler;
    StrictMockConnection connectionMock{ip, boost::beast::flat_buffer{}, tagFactory};
    RequestHandler<RpcHandlerMock> requestHandler{adminVerifier, rpcHandler};
};

TEST_F(RequestHandlerTest, RpcHandlerThrows)
{
    web::ng::Request const request{http::request<http::string_body>{http::verb::get, "/", 11}};

    EXPECT_CALL(*adminVerifier, isAdmin).WillOnce(testing::Return(true));
    EXPECT_CALL(rpcHandler, call).WillOnce(testing::Throw(std::runtime_error{"some error"}));

    runSpawn([&](boost::asio::yield_context yield) {
        auto response = requestHandler(request, connectionMock, nullptr, yield);

        auto const httpResponse = std::move(response).intoHttpResponse();

        EXPECT_EQ(httpResponse.result(), boost::beast::http::status::internal_server_error);

        auto const body = boost::json::parse(httpResponse.body()).as_object();
        EXPECT_EQ(body.at("error").as_string(), "internal");
        EXPECT_EQ(body.at("error_code").as_int64(), rpc::RippledError::rpcINTERNAL);
        EXPECT_EQ(body.at("status").as_string(), "error");
    });
}

TEST_F(RequestHandlerTest, NoErrors)
{
    web::ng::Request const request{http::request<http::string_body>{http::verb::get, "/", 11}};
    web::ng::Response const response{http::status::ok, "some response", request};
    auto const httpResponse = web::ng::Response{response}.intoHttpResponse();

    EXPECT_CALL(*adminVerifier, isAdmin).WillOnce(testing::Return(true));
    EXPECT_CALL(rpcHandler, call).WillOnce(testing::Return(response));

    runSpawn([&](boost::asio::yield_context yield) {
        auto actualResponse = requestHandler(request, connectionMock, nullptr, yield);

        auto const actualHttpResponse = std::move(actualResponse).intoHttpResponse();

        EXPECT_EQ(actualHttpResponse.result(), httpResponse.result());
        EXPECT_EQ(actualHttpResponse.body(), httpResponse.body());
        EXPECT_EQ(actualHttpResponse.version(), 11);
    });
}