/*
 * Copyright © Microsoft Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include "d3d12_wgl_public.h"

#include <Windows.h>
#include <dxgi1_4.h>
#include <directx/d3d12.h>
#include <wrl.h>

#include "util/u_memory.h"
#include "util/u_inlines.h"
#include "frontend/api.h"
#include "frontend/winsys_handle.h"

#include "stw_device.h"
#include "stw_pixelformat.h"
#include "stw_winsys.h"

#include "d3d12/d3d12_format.h"
#include "d3d12/d3d12_resource.h"
#include "d3d12/d3d12_screen.h"

using Microsoft::WRL::ComPtr;
constexpr uint32_t num_buffers = 2;

struct d3d12_wgl_framebuffer {
   struct stw_winsys_framebuffer base;

   struct d3d12_screen *screen;
   enum pipe_format pformat;
   HWND window;
   ComPtr<IDXGISwapChain3> swapchain;
   struct pipe_resource *buffers[num_buffers];
};

static struct d3d12_wgl_framebuffer *
d3d12_wgl_framebuffer(struct stw_winsys_framebuffer *fb)
{
   return (struct d3d12_wgl_framebuffer *)fb;
}

static void
d3d12_wgl_framebuffer_destroy(struct stw_winsys_framebuffer *fb,
                              pipe_context *ctx)
{
   struct d3d12_wgl_framebuffer *framebuffer = d3d12_wgl_framebuffer(fb);
   struct pipe_fence_handle *fence = NULL;

   if (ctx) {
      /* Ensure all resources are flushed */
      ctx->flush(ctx, &fence, PIPE_FLUSH_HINT_FINISH);
      if (fence) {
         ctx->screen->fence_finish(ctx->screen, ctx, fence, PIPE_TIMEOUT_INFINITE);
         ctx->screen->fence_reference(ctx->screen, &fence, NULL);
      }
   }

   for (int i = 0; i < num_buffers; ++i) {
      if (framebuffer->buffers[i]) {
         d3d12_resource_release(d3d12_resource(framebuffer->buffers[i]));
         pipe_resource_reference(&framebuffer->buffers[i], NULL);
      }
   }

   delete framebuffer;
}

static void
d3d12_wgl_framebuffer_resize(stw_winsys_framebuffer *fb,
                             pipe_context *ctx,
                             pipe_resource *templ)
{
   struct d3d12_wgl_framebuffer *framebuffer = d3d12_wgl_framebuffer(fb);
   struct d3d12_dxgi_screen *screen = d3d12_dxgi_screen(framebuffer->screen);

   DXGI_SWAP_CHAIN_DESC1 desc = {};
   desc.BufferCount = num_buffers;
   desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT | DXGI_USAGE_SHADER_INPUT;
   desc.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING;
   desc.Format = d3d12_get_format(templ->format);
   desc.Width = templ->width0;
   desc.Height = templ->height0;
   desc.SampleDesc.Count = 1;
   desc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL;

   framebuffer->pformat = templ->format;

   if (!framebuffer->swapchain) {
      ComPtr<IDXGISwapChain1> swapchain1;
      if (FAILED(screen->factory->CreateSwapChainForHwnd(
         screen->base.cmdqueue,
         framebuffer->window,
         &desc,
         nullptr,
         nullptr,
         &swapchain1))) {
         debug_printf("D3D12: failed to create swapchain");
         return;
      }

      swapchain1.As(&framebuffer->swapchain);

      screen->factory->MakeWindowAssociation(framebuffer->window,
                                             DXGI_MWA_NO_WINDOW_CHANGES | DXGI_MWA_NO_ALT_ENTER | DXGI_MWA_NO_PRINT_SCREEN);
   }
   else {
      struct pipe_fence_handle *fence = NULL;

      /* Ensure all resources are flushed */
      ctx->flush(ctx, &fence, PIPE_FLUSH_HINT_FINISH);
      if (fence) {
         ctx->screen->fence_finish(ctx->screen, ctx, fence, PIPE_TIMEOUT_INFINITE);
         ctx->screen->fence_reference(ctx->screen, &fence, NULL);
      }

      for (int i = 0; i < num_buffers; ++i) {
         if (framebuffer->buffers[i]) {
            d3d12_resource_release(d3d12_resource(framebuffer->buffers[i]));
            pipe_resource_reference(&framebuffer->buffers[i], NULL);
         }
      }
      if (FAILED(framebuffer->swapchain->ResizeBuffers(num_buffers, desc.Width, desc.Height, desc.Format, desc.Flags))) {
         debug_printf("D3D12: failed to resize swapchain");
      }
   }
}

static boolean
d3d12_wgl_framebuffer_present(stw_winsys_framebuffer *fb)
{
   auto framebuffer = d3d12_wgl_framebuffer(fb);
   if (!framebuffer->swapchain) {
      debug_printf("D3D12: Cannot present; no swapchain");
      return false;
   }

   if (stw_dev->swap_interval < 1)
      return S_OK == framebuffer->swapchain->Present(0, DXGI_PRESENT_ALLOW_TEARING);
   else
       return S_OK == framebuffer->swapchain->Present(stw_dev->swap_interval, 0);
}

static struct pipe_resource *
d3d12_wgl_framebuffer_get_resource(struct stw_winsys_framebuffer *pframebuffer,
                                   st_attachment_type statt)
{
   auto framebuffer = d3d12_wgl_framebuffer(pframebuffer);
   auto pscreen = &framebuffer->screen->base;

   if (!framebuffer->swapchain)
      return nullptr;

   UINT index = framebuffer->swapchain->GetCurrentBackBufferIndex();
   if (statt == ST_ATTACHMENT_FRONT_LEFT)
      index = !index;

   if (framebuffer->buffers[index]) {
      pipe_reference(NULL, &framebuffer->buffers[index]->reference);
      return framebuffer->buffers[index];
   }

   ID3D12Resource *res;
   framebuffer->swapchain->GetBuffer(index, IID_PPV_ARGS(&res));
   if (!res)
      return nullptr;

   struct winsys_handle handle;
   memset(&handle, 0, sizeof(handle));
   handle.type = WINSYS_HANDLE_TYPE_D3D12_RES;
   handle.com_obj = res;

   D3D12_RESOURCE_DESC res_desc = res->GetDesc();

   struct pipe_resource templ;
   memset(&templ, 0, sizeof(templ));
   templ.target = PIPE_TEXTURE_2D;
   templ.format = framebuffer->pformat;
   templ.width0 = res_desc.Width;
   templ.height0 = res_desc.Height;
   templ.depth0 = 1;
   templ.array_size = res_desc.DepthOrArraySize;
   templ.nr_samples = res_desc.SampleDesc.Count;
   templ.last_level = res_desc.MipLevels - 1;
   templ.bind = PIPE_BIND_DISPLAY_TARGET | PIPE_BIND_RENDER_TARGET;
   templ.usage = PIPE_USAGE_DEFAULT;
   templ.flags = 0;

   pipe_resource_reference(&framebuffer->buffers[index],
                           pscreen->resource_from_handle(pscreen, &templ, &handle,
                                                         PIPE_HANDLE_USAGE_FRAMEBUFFER_WRITE));
   return framebuffer->buffers[index];
}

struct stw_winsys_framebuffer *
d3d12_wgl_create_framebuffer(struct pipe_screen *screen,
                             HWND hWnd,
                             int iPixelFormat)
{
   const struct stw_pixelformat_info *pfi =
      stw_pixelformat_get_info(iPixelFormat);
   if (!(pfi->pfd.dwFlags & PFD_DOUBLEBUFFER) ||
       (pfi->pfd.dwFlags & PFD_SUPPORT_GDI))
      return NULL;

   struct d3d12_wgl_framebuffer *fb = CALLOC_STRUCT(d3d12_wgl_framebuffer);
   if (!fb)
      return NULL;

   new (fb) struct d3d12_wgl_framebuffer();

   fb->window = hWnd;
   fb->screen = d3d12_screen(screen);
   fb->base.destroy = d3d12_wgl_framebuffer_destroy;
   fb->base.resize = d3d12_wgl_framebuffer_resize;
   fb->base.present = d3d12_wgl_framebuffer_present;
   fb->base.get_resource = d3d12_wgl_framebuffer_get_resource;

   return &fb->base;
}