#pragma once

#include "etl/InitialLoadObserverInterface.hpp"
#include "etl/LoadBalancerInterface.hpp"
#include "etl/NetworkValidatedLedgersInterface.hpp"
#include "etl/Source.hpp"
#include "feed/SubscriptionManagerInterface.hpp"
#include "rpc/Errors.hpp"
#include "util/config/ObjectView.hpp"

#include <boost/asio/io_context.hpp>
#include <boost/asio/spawn.hpp>
#include <boost/json/object.hpp>
#include <boost/uuid/uuid.hpp>
#include <gmock/gmock.h>
#include <grpcpp/support/status.h>
#include <gtest/gtest.h>
#include <org/xrpl/rpc/v1/get_ledger.pb.h>

#include <algorithm>
#include <chrono>
#include <cstddef>
#include <cstdint>
#include <expected>
#include <memory>
#include <optional>
#include <string>
#include <string_view>
#include <utility>
#include <vector>

struct MockSource : etl::SourceBase {
    MOCK_METHOD(void, run, (), (override));
    MOCK_METHOD(void, stop, (boost::asio::yield_context), (override));
    MOCK_METHOD(bool, isConnected, (), (const, override));
    MOCK_METHOD(void, setForwarding, (bool), (override));
    MOCK_METHOD(boost::json::object, toJson, (), (const, override));
    MOCK_METHOD(std::string, toString, (), (const, override));
    MOCK_METHOD(bool, hasLedger, (uint32_t), (const, override));
    MOCK_METHOD(
        (std::pair<grpc::Status, org::xrpl::rpc::v1::GetLedgerResponse>),
        fetchLedger,
        (uint32_t, bool, bool),
        (override)
    );
    MOCK_METHOD(
        etl::InitialLedgerLoadResult,
        loadInitialLedger,
        (uint32_t, uint32_t, etl::InitialLoadObserverInterface&),
        (override)
    );

    using ForwardToRippledReturnType = std::expected<boost::json::object, rpc::ClioError>;
    MOCK_METHOD(
        ForwardToRippledReturnType,
        forwardToRippled,
        (boost::json::object const&,
         std::optional<std::string> const&,
         std::string_view,
         boost::asio::yield_context),
        (const, override)
    );
};

template <template <typename> typename MockType>
using MockSourcePtr = std::shared_ptr<MockType<MockSource>>;

template <template <typename> typename MockType>
class MockSourceWrapper : public etl::SourceBase {
    MockSourcePtr<MockType> mock_;

public:
    MockSourceWrapper(MockSourcePtr<MockType> mockData) : mock_(std::move(mockData))
    {
    }

    void
    run() override
    {
        mock_->run();
    }

    void
    stop(boost::asio::yield_context yield) override
    {
        mock_->stop(yield);
    }

    bool
    isConnected() const override
    {
        return mock_->isConnected();
    }

    void
    setForwarding(bool isForwarding) override
    {
        mock_->setForwarding(isForwarding);
    }

    boost::json::object
    toJson() const override
    {
        return mock_->toJson();
    }

    std::string
    toString() const override
    {
        return mock_->toString();
    }

    bool
    hasLedger(uint32_t sequence) const override
    {
        return mock_->hasLedger(sequence);
    }

    std::pair<grpc::Status, org::xrpl::rpc::v1::GetLedgerResponse>
    fetchLedger(uint32_t sequence, bool getObjects, bool getObjectNeighbors) override
    {
        return mock_->fetchLedger(sequence, getObjects, getObjectNeighbors);
    }

    etl::InitialLedgerLoadResult
    loadInitialLedger(
        uint32_t sequence,
        uint32_t maxLedger,
        etl::InitialLoadObserverInterface& observer
    ) override
    {
        return mock_->loadInitialLedger(sequence, maxLedger, observer);
    }

    std::expected<boost::json::object, rpc::ClioError>
    forwardToRippled(
        boost::json::object const& request,
        std::optional<std::string> const& forwardToRippledClientIp,
        std::string_view xUserValue,
        boost::asio::yield_context yield
    ) const override
    {
        return mock_->forwardToRippled(request, forwardToRippledClientIp, xUserValue, yield);
    }
};

struct MockSourceCallbacks {
    etl::SourceBase::OnDisconnectHook onDisconnect;
    etl::SourceBase::OnConnectHook onConnect;
    etl::SourceBase::OnLedgerClosedHook onLedgerClosed;
};

template <template <typename> typename MockType>
struct MockSourceData {
    MockSourcePtr<MockType> source = std::make_shared<MockType<MockSource>>();
    std::optional<MockSourceCallbacks> callbacks;
};

template <template <typename> typename MockType = testing::NiceMock>
class MockSourceFactoryImpl {
    std::vector<MockSourceData<MockType>> mockData_;

public:
    MockSourceFactoryImpl(size_t numSources)
    {
        setSourcesNumber(numSources);

        ON_CALL(*this, makeSource)
            .WillByDefault([this](
                               util::config::ObjectView const&,
                               boost::asio::io_context&,
                               std::shared_ptr<feed::SubscriptionManagerInterface>,
                               std::shared_ptr<etl::NetworkValidatedLedgersInterface>,
                               std::chrono::steady_clock::duration,
                               etl::SourceBase::OnConnectHook onConnect,
                               etl::SourceBase::OnDisconnectHook onDisconnect,
                               etl::SourceBase::OnLedgerClosedHook onLedgerClosed
                           ) {
                auto it = std::ranges::find_if(mockData_, [](auto const& d) {
                    return not d.callbacks.has_value();
                });
                [&]() {
                    ASSERT_NE(it, mockData_.end()) << "Make source called more than expected";
                }();
                it->callbacks = MockSourceCallbacks{
                    .onDisconnect = std::move(onDisconnect),
                    .onConnect = std::move(onConnect),
                    .onLedgerClosed = std::move(onLedgerClosed)
                };

                return std::make_unique<MockSourceWrapper<MockType>>(it->source);
            });
    }

    void
    setSourcesNumber(size_t numSources)
    {
        mockData_.clear();
        mockData_.reserve(numSources);
        std::ranges::generate_n(std::back_inserter(mockData_), numSources, [] {
            return MockSourceData<MockType>{};
        });
    }

    template <typename... Args>
    etl::SourcePtr
    operator()(Args&&... args)
    {
        return makeSource(std::forward<Args>(args)...);
    }

    MOCK_METHOD(
        etl::SourcePtr,
        makeSource,
        (util::config::ObjectView const&,
         boost::asio::io_context&,
         std::shared_ptr<feed::SubscriptionManagerInterface>,
         std::shared_ptr<etl::NetworkValidatedLedgersInterface>,
         std::chrono::steady_clock::duration,
         etl::SourceBase::OnConnectHook,
         etl::SourceBase::OnDisconnectHook,
         etl::SourceBase::OnLedgerClosedHook)
    );

    MockType<MockSource>&
    sourceAt(size_t index)
    {
        return *mockData_.at(index).source;
    }

    MockSourceCallbacks&
    callbacksAt(size_t index)
    {
        auto& callbacks = mockData_.at(index).callbacks;
        [&]() { ASSERT_TRUE(callbacks.has_value()) << "Callbacks not set"; }();
        return *callbacks;
    }
};

using MockSourceFactory = testing::NiceMock<MockSourceFactoryImpl<>>;
using StrictMockSourceFactory = testing::StrictMock<MockSourceFactoryImpl<testing::StrictMock>>;