#pragma once

// MassBuilderSaveTool
// Copyright (C) 2021 Guillaume Jacquemin
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

#include <thread>

#include <Corrade/Containers/Pointer.h>
#include <Corrade/Utility/Configuration.h>
#include <Corrade/Utility/Resource.h>

#include <Magnum/Platform/Sdl2Application.h>
#include <Magnum/ImGuiIntegration/Context.h>

#include <SDL2/SDL.h>

#include <imgui.h>
#include <imgui_internal.h>

#include <efsw/efsw.hpp>

#include "../ProfileManager/ProfileManager.h"
#include "../MassManager/MassManager.h"

using namespace Corrade;
using namespace Magnum;

class SaveTool: public Platform::Sdl2Application, public efsw::FileWatchListener {
    public:
        explicit SaveTool(const Arguments& arguments);

        ~SaveTool() override;

        void handleFileAction(efsw::WatchID watch_id,
                              const std::string& dir,
                              const std::string& filename,
                              efsw::Action action,
                              std::string old_filename = "") override;

    private:
        // Events
        void drawEvent() override;
        void viewportEvent(ViewportEvent& event) override;

        void keyPressEvent(KeyEvent& event) override;
        void keyReleaseEvent(KeyEvent& event) override;

        void mousePressEvent(MouseEvent& event) override;
        void mouseReleaseEvent(MouseEvent& event) override;
        void mouseMoveEvent(MouseMoveEvent& event) override;
        void mouseScrollEvent(MouseScrollEvent& event) override;
        void textInputEvent(TextInputEvent& event) override;

        void anyEvent(SDL_Event& event) override;

        enum InitStatus: Int {
            InitSuccess,
            ProfileManagerFailure
        };
        void initEvent(SDL_Event& event);
        void updateCheckEvent(SDL_Event& event);

        // Initialisation methods
        void initialiseConfiguration();
        void initialiseGui();
        void initialiseManager();
        auto findGameDataDirectory() -> bool;
        void initialiseMassManager();
        void initialiseFileWatcher();

        // GUI-related methods
        void drawImGui();
        void drawGui();
        void drawMainMenu();
        void drawDisclaimer();
        void drawInitialisation();
        void drawProfileManager();
        auto drawBackupListPopup() -> ImGuiID;
        auto drawBackupProfilePopup(std::size_t profile_index) -> ImGuiID;
        auto drawDeleteProfilePopup(std::size_t profile_index) -> ImGuiID;
        void drawManager();
        auto drawIntEditPopup(int* value_to_edit, int max) -> bool;
        auto drawRenamePopup(Containers::ArrayView<char> name_view) -> bool;
        void drawGeneralInfo();
        void drawResearchInventory();
        void drawMassManager();
        auto drawDeleteMassPopup(int mass_index) -> ImGuiID;
        auto drawDeleteStagedMassPopup(const std::string& filename) -> ImGuiID;
        void drawAbout();
        void drawGameState();

        // Convenience wrappers over ImGui stuff
        void drawHelpMarker(const char* text, Float wrap_pos = 0.0f);
        void drawTooltip(const char* text, Float wrap_pos = 0.0f);

        template<typename Functor, typename... Args>
        auto drawUnsafeWidget(Functor func, Args... args) -> bool {
            GameState game_state = _gameState; // Copying the value to reduce the risk of a data race.
            if(!_unsafeMode && game_state != GameState::NotRunning) {
                ImGui::PushItemFlag(ImGuiItemFlags_Disabled, true);
                ImGui::PushStyleVar(ImGuiStyleVar_Alpha, 0.5f);
            }

            bool result = func(std::forward<Args>(args)...);

            if(!_unsafeMode && game_state != GameState::NotRunning) {
                ImGui::PopItemFlag();
                ImGui::PopStyleVar();
            }

            return result;
        } // Obviously, should only be used with ImGui widgets that return a bool.
          // Also, func should be a lambda if there are any default arguments, like ImGui::Button(), etc...

        template<typename... Args>
        void drawUnsafeText(const char* text, Args... args) { // Alternative to the above, for ImGui::Text*() variants.
            if(!_unsafeMode && _gameState != GameState::NotRunning) {
                ImGui::TextDisabled(text, std::forward<Args>(args)...);
            }
            else {
                ImGui::Text(text, std::forward<Args>(args)...);
            }
        }

        void openUri(const std::string& uri);

        void checkGameState();

        void checkForUpdates();

        Utility::Configuration _conf{"MassBuilderSaveTool.ini"};
        Utility::Resource _rs{"assets"};

        // GUI-related members
        ImGuiIntegration::Context _imgui{NoCreate};

        enum class UiState: uint8_t {
            Disclaimer,
            Initialising,
            ProfileManager,
            MainManager
        } _uiState{UiState::Disclaimer};

        bool _aboutPopup{false};
#ifdef SAVETOOL_DEBUG_BUILD
        bool _demoWindow{false};
        bool _styleEditor{false};
        bool _metricsWindow{false};
#endif

        std::thread _thread; // used for threaded operations such as profile manager init or update checking.

        UnsignedInt _initEventId;
        UnsignedInt _updateEventId;

        std::string _lastError;

        std::string _gameDataDir;
        std::string _configDir;
        std::string _saveDir;
        std::string _screenshotsDir;

        std::string _backupsDir;
        std::string _stagingDir;

        enum class GameState : UnsignedByte {
                Unknown, NotRunning, Running
        } _gameState{GameState::Unknown};

        SDL_TimerID _gameCheckTimerId = 0;

        Containers::Pointer<ProfileManager> _profileManager;
        Profile* _currentProfile{nullptr};

        Containers::Pointer<MassManager> _massManager;

        Containers::Pointer<efsw::FileWatcher> _fileWatcher;
        enum watchID {
            SaveDir = 0,
            StagingDir = 1
        };
        Containers::StaticArray<2, efsw::WatchID> _watchIDs;

        bool _checkUpdatesOnStartup{true};
        bool _unsafeMode{false};
};