#ifndef WINTYPES_H
#define WINTYPES_H

// ============================================================================
// wintypes.h - Windows 16-bit type definitions and constants
//
// Provides the fundamental types used by the Win16 API and DDI:
// basic integer types (WORD, DWORD, BOOL16), 16-bit handle types,
// far pointer (segment:offset) helpers, COLORREF, geometry types
// (Point16T, Rect16T), GetWinFlags constants, GlobalAlloc flags,
// and raster operation codes (ROP2 and ROP3).
//
// Uses stdint.h types for portability (DJGPP's uint32_t is unsigned
// long, not unsigned int).
// ============================================================================

#include <stdint.h>

// ============================================================================
// Windows 16-bit basic types
// ============================================================================

typedef uint16_t WORD;
typedef int16_t  SWORD;
typedef uint32_t DWORD;
typedef int32_t  LONG;
typedef uint8_t  BYTE;
typedef int16_t  BOOL16;

// 16-bit handle types
typedef uint16_t HANDLE16;
typedef uint16_t HWND16;
typedef uint16_t HDC16;
typedef uint16_t HMODULE16;
typedef uint16_t HINSTANCE16;
typedef uint16_t HGLOBAL16;
typedef uint16_t HBITMAP16;
typedef uint16_t HBRUSH16;
typedef uint16_t HPEN16;
typedef uint16_t HPALETTE16;
typedef uint16_t HRGN16;
typedef uint16_t HCURSOR16;
typedef uint16_t ATOM16;

// ============================================================================
// Far pointer types (16:16 segment:offset, stored little-endian)
// ============================================================================

typedef struct __attribute__((packed)) {
    uint16_t offset;
    uint16_t segment;
} FarPtr16T;

#define FARPTR16_NULL ((FarPtr16T){0, 0})

static inline FarPtr16T makeFarPtr16(uint16_t seg, uint16_t off)
{
    FarPtr16T fp;
    fp.segment = seg;
    fp.offset  = off;
    return fp;
}

static inline uint32_t farPtr16ToLinear(FarPtr16T fp)
{
    // For real-mode addresses only; PM addresses need descriptor lookup
    return ((uint32_t)fp.segment << 4) + fp.offset;
}

// ============================================================================
// Color types
// ============================================================================

typedef uint32_t ColorRefT;

#define RGB_RED(c)   ((uint8_t)(c))
#define RGB_GREEN(c) ((uint8_t)((c) >> 8))
#define RGB_BLUE(c)  ((uint8_t)((c) >> 16))
#define MAKE_RGB(r, g, b) ((ColorRefT)(((BYTE)(r)) | ((WORD)((BYTE)(g)) << 8) | ((DWORD)((BYTE)(b)) << 16)))

// Palette index color reference
#define PALETTEINDEX(i) ((ColorRefT)(0x01000000L | (DWORD)(WORD)(i)))

// ============================================================================
// Geometry types (16-bit, packed for compatibility with Win16 structures)
// ============================================================================

typedef struct __attribute__((packed)) {
    int16_t x;
    int16_t y;
} Point16T;

typedef struct __attribute__((packed)) {
    int16_t left;
    int16_t top;
    int16_t right;
    int16_t bottom;
} Rect16T;

// ============================================================================
// Windows constants
// ============================================================================

// GetWinFlags return values
#define WF_PMODE      0x0001
#define WF_CPU286     0x0002
#define WF_CPU386     0x0004
#define WF_CPU486     0x0008
#define WF_STANDARD   0x0010
#define WF_ENHANCED   0x0020
#define WF_80x87      0x0400

// GlobalAlloc flags
#define GMEM_FIXED      0x0000
#define GMEM_MOVEABLE   0x0002
#define GMEM_ZEROINIT   0x0040
#define GHND            (GMEM_MOVEABLE | GMEM_ZEROINIT)
#define GPTR            (GMEM_FIXED | GMEM_ZEROINIT)

// Boolean
#define WIN_FALSE  0
#define WIN_TRUE   1

// Null handle
#define NULL16  ((uint16_t)0)

// ============================================================================
// Raster operation codes (ROP2 and ROP3)
// ============================================================================

#define R2_BLACK       1
#define R2_NOTMERGEPEN 2
#define R2_MASKNOTPEN  3
#define R2_NOTCOPYPEN  4
#define R2_MASKPENNOT  5
#define R2_NOT         6
#define R2_XORPEN      7
#define R2_NOTMASKPEN  8
#define R2_MASKPEN     9
#define R2_NOTXORPEN   10
#define R2_NOP         11
#define R2_MERGENOTPEN 12
#define R2_COPYPEN     13
#define R2_MERGEPENNOT 14
#define R2_MERGEPEN    15
#define R2_WHITE       16

// Common ROP3 codes
#define SRCCOPY     0x00CC0020L
#define SRCPAINT    0x00EE0086L
#define SRCAND      0x008800C6L
#define SRCINVERT   0x00660046L
#define SRCERASE    0x00440328L
#define NOTSRCCOPY  0x00330008L
#define NOTSRCERASE 0x001100A6L
#define MERGECOPY   0x00C000CAL
#define MERGEPAINT  0x00BB0226L
#define PATCOPY     0x00F00021L
#define PATPAINT    0x00FB0A09L
#define PATINVERT   0x005A0049L
#define DSTINVERT   0x00550009L
#define BLACKNESS   0x00000042L
#define WHITENESS   0x00FF0062L

#endif // WINTYPES_H