#include "d3d9_monitor.h"

#include "d3d9_format.h"

namespace dxvk {

  uint32_t GetMonitorFormatBpp(D3D9Format Format) {
    switch (Format) {
    case D3D9Format::A8R8G8B8:
    case D3D9Format::X8R8G8B8: // This is still 32 bit even though the alpha is unspecified.
    case D3D9Format::A2R10G10B10:
      return 32;

    case D3D9Format::A1R5G5B5:
    case D3D9Format::X1R5G5B5:
    case D3D9Format::R5G6B5:
      return 16;

    default:
      Logger::warn(str::format(
        "GetMonitorFormatBpp: Unknown format: ",
        Format));
      return 32;
    }
  }


  bool IsSupportedAdapterFormat(
          D3D9Format Format,
          BOOL       Windowed) {
    return (Format == D3D9Format::A2R10G10B10 && !Windowed)
         || Format == D3D9Format::X8R8G8B8
         || Format == D3D9Format::X1R5G5B5
         || Format == D3D9Format::R5G6B5;
  }


  bool IsSupportedBackBufferFormat(
          D3D9Format AdapterFormat,
          D3D9Format BackBufferFormat,
          BOOL       Windowed) {
    if (!IsSupportedAdapterFormat(AdapterFormat, Windowed))
      return false;

    return AdapterFormat == BackBufferFormat
        || (AdapterFormat == D3D9Format::X8R8G8B8 && BackBufferFormat == D3D9Format::A8R8G8B8)
        || (AdapterFormat == D3D9Format::X1R5G5B5 && BackBufferFormat == D3D9Format::A1R5G5B5);
  }


  bool IsSupportedBackBufferFormat(
          D3D9Format BackBufferFormat,
          BOOL       Windowed) {
    return (BackBufferFormat == D3D9Format::A2R10G10B10 && !Windowed)
         || BackBufferFormat == D3D9Format::A8R8G8B8
         || BackBufferFormat == D3D9Format::X8R8G8B8
         || BackBufferFormat == D3D9Format::A1R5G5B5
         || BackBufferFormat == D3D9Format::X1R5G5B5
         || BackBufferFormat == D3D9Format::R5G6B5;
  }


  HRESULT SetMonitorDisplayMode(
          HMONITOR                hMonitor,
    const D3DDISPLAYMODEEX*       pMode) {
    ::MONITORINFOEXW monInfo;
    monInfo.cbSize = sizeof(monInfo);

    if (!::GetMonitorInfoW(hMonitor, reinterpret_cast<MONITORINFO*>(&monInfo))) {
      Logger::err("D3D9: Failed to query monitor info");
      return E_FAIL;
    }
    
    DEVMODEW devMode = { };
    devMode.dmSize       = sizeof(devMode);
    devMode.dmFields     = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;
    devMode.dmPelsWidth  = pMode->Width;
    devMode.dmPelsHeight = pMode->Height;
    devMode.dmBitsPerPel = GetMonitorFormatBpp(EnumerateFormat(pMode->Format));
    
    if (pMode->RefreshRate != 0)  {
      devMode.dmFields |= DM_DISPLAYFREQUENCY;
      devMode.dmDisplayFrequency = pMode->RefreshRate;
    }
    
    Logger::info(str::format("D3D9: Setting display mode: ",
      devMode.dmPelsWidth, "x", devMode.dmPelsHeight, "@",
      devMode.dmDisplayFrequency));
    
    LONG status = ::ChangeDisplaySettingsExW(
      monInfo.szDevice, &devMode, nullptr, CDS_FULLSCREEN, nullptr);

    if (status != DISP_CHANGE_SUCCESSFUL) {
      // Try again but without setting the frequency.
      devMode.dmFields &= ~DM_DISPLAYFREQUENCY;
      devMode.dmDisplayFrequency = 0;
      status = ::ChangeDisplaySettingsExW(
        monInfo.szDevice, &devMode, nullptr, CDS_FULLSCREEN, nullptr);
    }
    
    return status == DISP_CHANGE_SUCCESSFUL ? D3D_OK : D3DERR_NOTAVAILABLE;
  }

}