// 独立 D3D11 测试 - 不依赖引擎框架
#include <windows.h>
#include <d3d11.h>
#include <dxgi.h>
#include <stdio.h>

#pragma comment(lib, "d3d11.lib")
#pragma comment(lib, "dxgi.lib")

static ID3D11Device* device = NULL;
static ID3D11DeviceContext* context = NULL;
static IDXGISwapChain* swap_chain = NULL;
static ID3D11RenderTargetView* rtv = NULL;

static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    if (msg == WM_DESTROY) { PostQuitMessage(0); return 0; }
    return DefWindowProcW(hwnd, msg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    (void)hPrevInstance; (void)lpCmdLine; (void)nCmdShow;

    // 注册窗口类
    WNDCLASSEXW wc = {0};
    wc.cbSize = sizeof(WNDCLASSEXW);
    wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = L"D3D11Test";
    RegisterClassExW(&wc);

    // 创建窗口
    HWND hwnd = CreateWindowExW(0, L"D3D11Test", L"D3D11 Test",
        WS_OVERLAPPEDWINDOW, 100, 100, 800, 600,
        NULL, NULL, hInstance, NULL);
    ShowWindow(hwnd, SW_SHOW);
    UpdateWindow(hwnd);

    // 创建 D3D11 设备和交换链
    DXGI_SWAP_CHAIN_DESC scd = {0};
    scd.BufferCount = 1;
    scd.BufferDesc.Width = 800;
    scd.BufferDesc.Height = 600;
    scd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
    scd.BufferDesc.RefreshRate.Numerator = 60;
    scd.BufferDesc.RefreshRate.Denominator = 1;
    scd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
    scd.OutputWindow = hwnd;
    scd.SampleDesc.Count = 1;
    scd.Windowed = TRUE;
    scd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;

    D3D_FEATURE_LEVEL levels[] = {D3D_FEATURE_LEVEL_11_0};
    HRESULT hr = D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL, 0, levels, 1, D3D11_SDK_VERSION, &scd, &swap_chain, &device, NULL, &context);

    if (FAILED(hr)) {
        MessageBoxW(hwnd, L"D3D11 CreateDevice Failed!", L"Error", MB_OK);
        return -1;
    }

    // 创建渲染目标
    ID3D11Texture2D* back_buffer = NULL;
    swap_chain->lpVtbl->GetBuffer(swap_chain, 0, &IID_ID3D11Texture2D, (void**)&back_buffer);
    device->lpVtbl->CreateRenderTargetView(device, (ID3D11Resource*)back_buffer, NULL, &rtv);
    back_buffer->lpVtbl->Release(back_buffer);

    // 设置渲染目标
    context->lpVtbl->OMSetRenderTargets(context, 1, &rtv, NULL);

    // 主循环
    MSG msg = {0};
    while (msg.message != WM_QUIT) {
        while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
            if (msg.message == WM_QUIT) break;
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

        // 清屏 - 蓝色
        float color[4] = {0.2f, 0.5f, 0.8f, 1.0f};
        context->lpVtbl->ClearRenderTargetView(context, rtv, color);

        // 呈现
        swap_chain->lpVtbl->Present(swap_chain, 0, 0);
    }

    // 清理
    rtv->lpVtbl->Release(rtv);
    swap_chain->lpVtbl->Release(swap_chain);
    context->lpVtbl->Release(context);
    device->lpVtbl->Release(device);

    return 0;
}