#ifndef ENGINE_H
#define ENGINE_H

#include <filesystem>

#include <components/compiler/extensions.hpp>
#include <components/esm/refid.hpp>
#include <components/files/collections.hpp>
#include <components/settings/settings.hpp>
#include <components/translation/translation.hpp>

#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>

#include "mwbase/environment.hpp"

namespace Resource
{
    class ResourceSystem;
}

namespace SceneUtil
{
    class WorkQueue;
    class AsyncScreenCaptureOperation;
    class UnrefQueue;
}

namespace VFS
{
    class Manager;
}

namespace Compiler
{
    class Context;
}

namespace MWLua
{
    class LuaManager;
    class Worker;
}

namespace Stereo
{
    class Manager;
}

namespace Files
{
    struct ConfigurationManager;
}

namespace osgViewer
{
    class ScreenCaptureHandler;
}

namespace SceneUtil
{
    class SelectDepthFormatOperation;

    namespace Color
    {
        class SelectColorFormatOperation;
    }
}

namespace MWState
{
    class StateManager;
}

namespace MWGui
{
    class WindowManager;
}

namespace MWInput
{
    class InputManager;
}

namespace MWSound
{
    class SoundManager;
}

namespace MWWorld
{
    class World;
}

namespace MWScript
{
    class ScriptManager;
}

namespace MWMechanics
{
    class MechanicsManager;
}

namespace MWDialogue
{
    class DialogueManager;
}

namespace MWDialogue
{
    class Journal;
}

namespace l10n
{
    class Manager;
}

struct SDL_Window;

namespace OMW
{
    /// \brief Main engine class, that brings together all the components of OpenMW
    class Engine
    {
        SDL_Window* mWindow;
        std::unique_ptr<VFS::Manager> mVFS;
        std::unique_ptr<Resource::ResourceSystem> mResourceSystem;
        osg::ref_ptr<SceneUtil::WorkQueue> mWorkQueue;
        std::unique_ptr<SceneUtil::UnrefQueue> mUnrefQueue;
        std::unique_ptr<MWWorld::World> mWorld;
        std::unique_ptr<MWSound::SoundManager> mSoundManager;
        std::unique_ptr<MWScript::ScriptManager> mScriptManager;
        std::unique_ptr<MWGui::WindowManager> mWindowManager;
        std::unique_ptr<MWMechanics::MechanicsManager> mMechanicsManager;
        std::unique_ptr<MWDialogue::DialogueManager> mDialogueManager;
        std::unique_ptr<MWDialogue::Journal> mJournal;
        std::unique_ptr<MWInput::InputManager> mInputManager;
        std::unique_ptr<MWState::StateManager> mStateManager;
        std::unique_ptr<MWLua::LuaManager> mLuaManager;
        std::unique_ptr<MWLua::Worker> mLuaWorker;
        std::unique_ptr<l10n::Manager> mL10nManager;
        MWBase::Environment mEnvironment;
        ToUTF8::FromType mEncoding;
        std::unique_ptr<ToUTF8::Utf8Encoder> mEncoder;
        Files::PathContainer mDataDirs;
        std::vector<std::string> mArchives;
        std::filesystem::path mResDir;
        osg::ref_ptr<osgViewer::Viewer> mViewer;
        osg::ref_ptr<osgViewer::ScreenCaptureHandler> mScreenCaptureHandler;
        osg::ref_ptr<SceneUtil::AsyncScreenCaptureOperation> mScreenCaptureOperation;
        osg::ref_ptr<SceneUtil::SelectDepthFormatOperation> mSelectDepthFormatOperation;
        osg::ref_ptr<SceneUtil::Color::SelectColorFormatOperation> mSelectColorFormatOperation;
        std::string mCellName;
        std::vector<std::string> mContentFiles;
        std::vector<std::string> mGroundcoverFiles;

        std::unique_ptr<Stereo::Manager> mStereoManager;

        bool mSkipMenu;
        bool mUseSound;
        bool mCompileAll;
        bool mCompileAllDialogue;
        int mWarningsMode;
        std::string mFocusName;
        bool mScriptConsoleMode;
        std::string mStartupScript;
        int mActivationDistanceOverride;
        std::filesystem::path mSaveGameFile;
        // Grab mouse?
        bool mGrab;

        unsigned int mRandomSeed;

        Compiler::Extensions mExtensions;
        std::unique_ptr<Compiler::Context> mScriptContext;

        Files::Collections mFileCollections;
        bool mFSStrict;
        Translation::Storage mTranslationDataStorage;
        std::vector<ESM::RefId> mScriptBlacklist;
        bool mScriptBlacklistUse;
        bool mNewGame;

        // not implemented
        Engine(const Engine&);
        Engine& operator=(const Engine&);

        void executeLocalScripts();

        bool frame(float dt);

        /// Prepare engine for game play
        void prepareEngine();

        void createWindow();
        void setWindowIcon();

    public:
        Engine(Files::ConfigurationManager& configurationManager);
        virtual ~Engine();

        /// Enable strict filesystem mode (do not fold case)
        ///
        /// \attention The strict mode must be specified before any path-related settings
        /// are given to the engine.
        void enableFSStrict(bool fsStrict);

        /// Set data dirs
        void setDataDirs(const Files::PathContainer& dataDirs);

        /// Add BSA archive
        void addArchive(const std::string& archive);

        /// Set resource dir
        void setResourceDir(const std::filesystem::path& parResDir);

        /// Set start cell name
        void setCell(const std::string& cellName);

        /**
         * @brief addContentFile - Adds content file (ie. esm/esp, or omwgame/omwaddon) to the content files container.
         * @param file - filename (extension is required)
         */
        void addContentFile(const std::string& file);
        void addGroundcoverFile(const std::string& file);

        /// Disable or enable all sounds
        void setSoundUsage(bool soundUsage);

        /// Skip main menu and go directly into the game
        ///
        /// \param newGame Start a new game instead off dumping the player into the game
        /// (ignored if !skipMenu).
        void setSkipMenu(bool skipMenu, bool newGame);

        void setGrabMouse(bool grab) { mGrab = grab; }

        /// Initialise and enter main loop.
        void go();

        /// Compile all scripts (excludign dialogue scripts) at startup?
        void setCompileAll(bool all);

        /// Compile all dialogue scripts at startup?
        void setCompileAllDialogue(bool all);

        /// Font encoding
        void setEncoding(const ToUTF8::FromType& encoding);

        /// Enable console-only script functionality
        void setScriptConsoleMode(bool enabled);

        /// Set path for a script that is run on startup in the console.
        void setStartupScript(const std::string& path);

        /// Override the game setting specified activation distance.
        void setActivationDistanceOverride(int distance);

        void setWarningsMode(int mode);

        void setScriptBlacklist(const std::vector<ESM::RefId>& list);

        void setScriptBlacklistUse(bool use);

        /// Set the save game file to load after initialising the engine.
        void setSaveGameFile(const std::filesystem::path& savegame);

        void setRandomSeed(unsigned int seed);

    private:
        Files::ConfigurationManager& mCfgMgr;
        int mGlMaxTextureImageUnits;
    };
}

#endif /* ENGINE_H */