// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.


#if PLATFORM_SDL && PLATFORM_WINDOWS

#include "SDLPlatform.h"
#include "Engine/Core/Collections/Array.h"
#include "Engine/Platform/WindowsManager.h"
#include "Engine/Platform/Win32/IncludeWindowsHeaders.h"
#include "Engine/Input/Mouse.h"

#include <SDL3/SDL_hints.h>
#include <SDL3/SDL_init.h>
#include <SDL3/SDL_system.h>
#include <SDL3/SDL_timer.h>
#include "SDLInput.h"
#include <Engine/Core/Log.h>

#if true

extern Window* draggedWindow;
Float2 draggedWindowStartPosition = Float2::Zero;
Float2 draggedWindowMousePosition = Float2::Zero;

// The events for releasing the mouse during window dragging are missing, handle the mouse release event here
bool SDLCALL SDLPlatform::EventMessageHook(void* userdata, MSG* msg)
{
#define GET_WINDOW_WITH_HWND(window, hwnd) \
    do { \
        (window) = nullptr; \
        WindowsManager::WindowsLocker.Lock(); \
        for (int32 i = 0; i < WindowsManager::Windows.Count(); i++) \
        { \
            if (WindowsManager::Windows[i]->GetNativePtr() == (hwnd)) \
            { \
                (window) = WindowsManager::Windows[i]; \
                break; \
            } \
        } \
        WindowsManager::WindowsLocker.Unlock(); \
        ASSERT((window) != nullptr); \
    } while (false)

    if (draggedWindow != nullptr)
    {
        LOG(Info, "event hook message: {}", msg->message);
    }

    if (msg->message == WM_NCLBUTTONDOWN)
    {
        Window* window;
        GET_WINDOW_WITH_HWND(window, msg->hwnd);
        draggedWindow = window;

        draggedWindowStartPosition = draggedWindow->GetClientPosition();
        Float2 mousePos(static_cast<float>(static_cast<LONG>(WINDOWS_GET_X_LPARAM(msg->lParam))), static_cast<float>(static_cast<LONG>(WINDOWS_GET_Y_LPARAM(msg->lParam))));
        draggedWindowMousePosition = mousePos;
        draggedWindowMousePosition -= draggedWindowStartPosition;

        bool result = false;
        WindowHitCodes hit = static_cast<WindowHitCodes>(msg->wParam);
        window->OnHitTest(mousePos, hit, result);
        //if (result && hit != WindowHitCodes::Caption)
        //    return false;

        if (hit == WindowHitCodes::Caption)
        {
            SDL_Event event{ 0 };
            event.button.type = SDL_EVENT_MOUSE_BUTTON_DOWN;
            event.button.down = true;
            event.button.timestamp = SDL_GetTicksNS();
            event.button.windowID = SDL_GetWindowID(window->GetSDLWindow());
            event.button.button = SDL_BUTTON_LEFT;
            event.button.clicks = 1;
            event.button.x = draggedWindowMousePosition.X;
            event.button.y = draggedWindowMousePosition.Y;

            SDL_PushEvent(&event);
        }
    }
    /*else if (msg->message == WM_NCLBUTTONUP || msg->message == WM_CAPTURECHANGED)
    {
        windowDragging = false;
        Window* window;
        GET_WINDOW_WITH_HWND(window, msg->hwnd);

        SDL_Event event{ 0 };
        event.button.type = SDL_EVENT_MOUSE_BUTTON_UP;
        event.button.down = false;
        event.button.timestamp = SDL_GetTicksNS();
        event.button.windowID = SDL_GetWindowID(window->GetSDLWindow());
        event.button.button = SDL_BUTTON_LEFT;
        event.button.clicks = 1;
        event.button.x = static_cast<float>(static_cast<LONG>(WINDOWS_GET_X_LPARAM(msg->lParam)));
        event.button.y = static_cast<float>(static_cast<LONG>(WINDOWS_GET_Y_LPARAM(msg->lParam)));

        SDL_PushEvent(&event);
    }*/
    return true;
#undef GET_WINDOW_WITH_HWND
}
#endif

bool SDLPlatform::InitPlatform()
{
#if true
    // Workaround required for handling window dragging events properly for DockHintWindow
    SDL_SetWindowsMessageHook(&EventMessageHook, nullptr);
#endif

    if (WindowsPlatform::Init())
        return true;

    return false;
}

bool SDLPlatform::UsesWindows()
{
    return true;
}

bool SDLPlatform::UsesWayland()
{
    return false;
}

bool SDLPlatform::UsesXWayland()
{
    return false;
}

bool SDLPlatform::UsesX11()
{
    return false;
}

void SDLPlatform::SetHighDpiAwarenessEnabled(bool enable)
{
    // Other supported values: "permonitor", "permonitorv2"
    SDL_SetHint("SDL_WINDOWS_DPI_AWARENESS", enable ? "system" : "unaware");
}

#endif