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use crate::status::Status;

#[derive(Copy, Clone, Debug)]
#[repr(C)]
pub struct GraphicsBltPixel {
    pub Blue: u8,
    pub Green: u8,
    pub Red: u8,
    pub Reserved: u8
}

#[derive(Copy, Clone, Debug)]
#[repr(C)]
pub enum GraphicsBltOp {
    // Write data from the first buffer pixel to every pixel of the display
    VideoFill,
    // Copy from the display to the buffer
    VideoToBuffer,
    // Copy from the buffer to the display
    BufferToVideo,
    // Copy from the display to the display
    VideoToVideo
}

#[derive(Copy, Clone, Debug)]
#[repr(C)]
pub enum GraphicsPixelFormat {
  ///
  /// A pixel is 32-bits and byte zero represents red, byte one represents green,
  /// byte two represents blue, and byte three is reserved. This is the definition
  /// for the physical frame buffer. The byte values for the red, green, and blue
  /// components represent the color intensity. This color intensity value range
  /// from a minimum intensity of 0 to maximum intensity of 255.
  ///
  PixelRedGreenBlueReserved8BitPerColor,
  ///
  /// A pixel is 32-bits and byte zero represents blue, byte one represents green,
  /// byte two represents red, and byte three is reserved. This is the definition
  /// for the physical frame buffer. The byte values for the red, green, and blue
  /// components represent the color intensity. This color intensity value range
  /// from a minimum intensity of 0 to maximum intensity of 255.
  ///
  PixelBlueGreenRedReserved8BitPerColor,
  ///
  /// The Pixel definition of the physical frame buffer.
  ///
  PixelBitMask,
  ///
  /// This mode does not support a physical frame buffer.
  ///
  PixelBltOnly,
  ///
  /// Valid EFI_GRAPHICS_PIXEL_FORMAT enum values are less than this value.
  ///
  PixelFormatMax
}

#[derive(Copy, Clone, Debug)]
#[repr(C)]
pub struct GraphicsPixelBitmask {
  pub RedMask: u32,
  pub GreenMask: u32,
  pub BlueMask: u32,
  pub ReservedMask: u32,
}

#[derive(Copy, Clone, Debug)]
#[repr(C)]
pub struct GraphicsOutputModeInfo {
  /// The version of this data structure. A value of zero represents the
  /// EFI_GRAPHICS_OUTPUT_MODE_INFORMATION structure as defined in this specification.
  pub Version: u32,
  /// The size of video screen in pixels in the X dimension.
  pub HorizontalResolution: u32,
  /// The size of video screen in pixels in the Y dimension.
  pub VerticalResolution: u32,
  /// Enumeration that defines the physical format of the pixel. A value of PixelBltOnly
  /// implies that a linear frame buffer is not available for this mode.
  pub PixelFormat: GraphicsPixelFormat,
  /// This bit-mask is only valid if PixelFormat is set to PixelPixelBitMask.
  /// A bit being set defines what bits are used for what purpose such as Red, Green, Blue, or Reserved.
  pub PixelInformation: GraphicsPixelBitmask,
  /// Defines the number of pixel elements per video memory line.
  pub PixelsPerScanLine: u32,
}

#[derive(Debug)]
#[repr(C)]
pub struct GraphicsOutputMode {
  /// The number of modes supported by QueryMode() and SetMode().
  pub MaxMode: u32,
  /// Current Mode of the graphics device. Valid mode numbers are 0 to MaxMode -1.
  pub Mode: u32,
  /// Pointer to read-only EFI_GRAPHICS_OUTPUT_MODE_INFORMATION data.
  pub Info: &'static GraphicsOutputModeInfo,
  /// Size of Info structure in bytes.
  pub SizeOfInfo: usize,
  /// Base address of graphics linear frame buffer.
  /// Offset zero in FrameBufferBase represents the upper left pixel of the display.
  pub FrameBufferBase: usize,
  /// Amount of frame buffer needed to support the active mode as defined by
  /// PixelsPerScanLine xVerticalResolution x PixelElementSize.
  pub FrameBufferSize: usize,
}

#[repr(C)]
pub struct GraphicsOutput {
    pub QueryMode: extern "win64" fn (&mut GraphicsOutput, u32, &mut usize, &mut *mut GraphicsOutputModeInfo) -> Status,
    pub SetMode: extern "win64" fn (&mut GraphicsOutput, u32) -> Status,
    pub Blt: extern "win64" fn (&mut GraphicsOutput, *mut GraphicsBltPixel, GraphicsBltOp, usize, usize, usize, usize, usize, usize, usize) -> Status,
    pub Mode: &'static mut GraphicsOutputMode
}