#include <main.h>

#include <Core/Application/ApplicationManager.h>
#include <Core/HAL/Display/Display.h>
#include <Core/HAL/DynLib/DynamicLibrary.h>
#include <Core/HAL/Event/SystemEvent.h>
#include <Core/HAL/Filesystem/Filesystem.h>
#include <Core/JulietInit.h>
#include <Core/Logging/LogManager.h>
#include <Core/Logging/LogTypes.h>
#include <Graphics/Graphics.h>
#include <Graphics/GraphicsConfig.h>
#include <Graphics/RenderPass.h>
#include <Windows.h>

#include <Core/Memory/Utils.h>
#include <cstdlib>

// TODO : Replace with message box from framework + call main and not winmain + subsystem
// TODO : Think how to do the draw pipeline.
// Ex: Expose a Draw method ?
// Store a graphics context ?
// For now. Put everything in Update down below.
// Should split update from draw, update should have a != timestep than graphics (60fps or more)

// TODO : Remove main.h. Useless
// May be remove that Application class, useless too.

using namespace Juliet;

namespace
{
    using GameInit_t     = void (*)(void);
    using GameShutdown_t = void (*)(void);
    using GameUpdate_t   = void (*)(float deltaTime);
    struct GameFunctionTable
    {
        GameInit_t     Init     = nullptr;
        GameShutdown_t Shutdown = nullptr;
        GameUpdate_t   Update   = nullptr;
    } Game;
    const char* GameFunctionTable[] = { "GameInit", "GameShutdown", "GameUpdate" };
} // namespace

void JulietApplication::Init()
{
    Log(LogLevel::Message, LogCategory::Editor, "Initializing Juliet Application...");

    Log(LogLevel::Message, LogCategory::Editor, "%s", GetBasePath());

    GraphicsConfig config;
    GraphicsDevice = CreateGraphicsDevice(config);

    MainWindow = CreatePlatformWindow("Juliet Editor", 1280, 720);

    Running = MainWindow != nullptr && GraphicsDevice != nullptr;

    if (Running)
    {
        AttachToWindow(GraphicsDevice, MainWindow);
        // Game = LoadDynamicLibrary("Game.dll");

        GameCode.Functions     = reinterpret_cast<void**>(&Game);
        GameCode.FunctionCount = ArraySize(GameFunctionTable);
        GameCode.FunctionNames = GameFunctionTable;
        InitHotReloadCode(GameCode, StringBufferParam("Game.dll"), StringBufferParam("Game_Temp.dll"), StringBufferParam("lock.tmp"));
        if ((Running = GameCode.IsValid))
        {
            Game.Init();
        }
    }
}

void JulietApplication::Shutdown()
{
    Log(LogLevel::Message, LogCategory::Editor, "Shutting down Juliet Application...");

    Game.Shutdown();
    ShutdownHotReloadCode(GameCode);

    if (MainWindow && GraphicsDevice)
    {
        DetachFromWindow(GraphicsDevice, MainWindow);
    }

    if (MainWindow)
    {
        DestroyPlatformWindow(MainWindow);
    }

    if (GraphicsDevice)
    {
        DestroyGraphicsDevice(GraphicsDevice);
    }

    Log(LogLevel::Message, LogCategory::Editor, "Juliet App shutdown Completed");
}

void JulietApplication::Update()
{
    SystemEvent evt;
    while (GetEvent(evt))
    {
        if (evt.Type == EventType::Window_Close_Request)
        {
            if (evt.Data.Window.AssociatedWindowID == GetWindowID(MainWindow))
            {
                Running = false;
            }
        }
    }

    Game.Update(0.0f);

    if (ShouldReloadCode(GameCode))
    {
        ReloadCode(GameCode);
    }

    // Draw here for now
    // 1) Acquire a Command Buffer
    CommandList* cmdList = AcquireCommandList(GraphicsDevice, QueueType::Graphics);
    if (cmdList == nullptr)
    {
        Log(LogLevel::Error, LogCategory::Editor, "Failed to acquire command list.");
        Running = false;
        return;
    }

    Texture* swapChainTexture = nullptr;
    if (!AcquireSwapChainTexture(cmdList, MainWindow, &swapChainTexture))
    {
        Log(LogLevel::Error, LogCategory::Editor, "Failed to acquire swapchain texture.");
        Running = false;
        return;
    }

    if (swapChainTexture)
    {
        ColorTargetInfo colorTargetInfo = {};
        colorTargetInfo.TargetTexture   = swapChainTexture;
        colorTargetInfo.ClearColor      = { .R = .5f, .G = .8f, .B = .0f, .A = 1.f };
        colorTargetInfo.LoadOperation   = LoadOperation::Clear;
        colorTargetInfo.StoreOperation  = StoreOperation::Store;

        RenderPass* renderPass = BeginRenderPass(cmdList, colorTargetInfo);
        EndRenderPass(renderPass);
    }

    // Submit Commands
    SubmitCommandLists(cmdList);
}

bool JulietApplication::IsRunning()
{
    return Running;
}

namespace
{
    JulietApplication EditorApplication;
}

JulietApplication& GetEditorApplication()
{
    return EditorApplication;
}

int main(int argc, char** argv)
{
    CreateMutex(0, false, L"Local\\Juliet.App");
    if (GetLastError() == ERROR_ALREADY_EXISTS)
    {
        MessageBox(nullptr, L"An instance of Juliet is already running.", L"Juliet", MB_OK | MB_ICONEXCLAMATION);
        return EXIT_FAILURE;
    }

    StartApplication(EditorApplication, JulietInit_Flags::Display);

    // Pause here to not close the console window immediatly on stop
    system("PAUSE");

    return EXIT_SUCCESS;
}