// winmm.c - Win32 multimedia: waveform audio, timer
// Stubs only; no audio hardware access at this stage.
#include <stdint.h>
#include <stddef.h>

// ---------------------------------------------------------------------------
// Types
// ---------------------------------------------------------------------------
typedef unsigned int  MMRESULT;
typedef void*         HWAVEOUT;

#define MMSYSERR_NOERROR      0
#define MMSYSERR_NOTSUPPORTED 8
#define WAVERR_STILLPLAYING   33

// WAVEFORMATEX - standard PCM audio format descriptor.
typedef struct {
    unsigned short wFormatTag;
    unsigned short nChannels;
    unsigned int   nSamplesPerSec;
    unsigned int   nAvgBytesPerSec;
    unsigned short nBlockAlign;
    unsigned short wBitsPerSample;
    unsigned short cbSize;
} WAVEFORMATEX;

// WAVEHDR - buffer header submitted to waveOutWrite.
typedef struct _WAVEHDR {
    char*          lpData;
    unsigned int   dwBufferLength;
    unsigned int   dwBytesRecorded;
    uintptr_t      dwUser;
    unsigned int   dwFlags;
    unsigned int   dwLoops;
    struct _WAVEHDR* lpNext;
    uintptr_t      reserved;
} WAVEHDR;

// MMTIME - used by waveOutGetPosition.
typedef struct {
    unsigned int wType;
    union {
        unsigned int ms;
        unsigned int sample;
        unsigned int cb;
        unsigned int ticks;
    } u;
} MMTIME;

// ---------------------------------------------------------------------------
// Timer
// ---------------------------------------------------------------------------

// timeGetTime is the lightweight alternative to GetTickCount; both return
// milliseconds since system start.  We forward to the kernel tick counter.
extern uint64_t SysGetTick(void);

__declspec(dllexport) unsigned long timeGetTime(void) {
    return (unsigned long)SysGetTick();
}

// ---------------------------------------------------------------------------
// Waveform audio (stubs - no audio hardware at this stage)
// ---------------------------------------------------------------------------

__declspec(dllexport) MMRESULT waveOutOpen(HWAVEOUT* phwo, unsigned int deviceId,
                                            const WAVEFORMATEX* fmt, uintptr_t callback,
                                            uintptr_t callbackInstance, unsigned long flags) {
    (void)deviceId; (void)fmt; (void)callback; (void)callbackInstance; (void)flags;
    if (phwo) *phwo = (void*)0;
    return MMSYSERR_NOTSUPPORTED;
}

__declspec(dllexport) MMRESULT waveOutClose(HWAVEOUT hwo) {
    (void)hwo; return MMSYSERR_NOERROR;
}

__declspec(dllexport) MMRESULT waveOutPrepareHeader(HWAVEOUT hwo, WAVEHDR* hdr,
                                                     unsigned int size) {
    (void)hwo; (void)hdr; (void)size; return MMSYSERR_NOERROR;
}

__declspec(dllexport) MMRESULT waveOutUnprepareHeader(HWAVEOUT hwo, WAVEHDR* hdr,
                                                       unsigned int size) {
    (void)hwo; (void)hdr; (void)size; return MMSYSERR_NOERROR;
}

__declspec(dllexport) MMRESULT waveOutWrite(HWAVEOUT hwo, WAVEHDR* hdr, unsigned int size) {
    (void)hwo; (void)hdr; (void)size; return MMSYSERR_NOTSUPPORTED;
}

__declspec(dllexport) MMRESULT waveOutPause(HWAVEOUT hwo) {
    (void)hwo; return MMSYSERR_NOERROR;
}

__declspec(dllexport) MMRESULT waveOutRestart(HWAVEOUT hwo) {
    (void)hwo; return MMSYSERR_NOERROR;
}

__declspec(dllexport) MMRESULT waveOutReset(HWAVEOUT hwo) {
    (void)hwo; return MMSYSERR_NOERROR;
}

__declspec(dllexport) MMRESULT waveOutSetVolume(HWAVEOUT hwo, unsigned long volume) {
    (void)hwo; (void)volume; return MMSYSERR_NOTSUPPORTED;
}

__declspec(dllexport) MMRESULT waveOutGetPosition(HWAVEOUT hwo, MMTIME* mmt,
                                                   unsigned int size) {
    (void)hwo; (void)size;
    if (mmt) { mmt->wType = 0; mmt->u.ms = 0; }
    return MMSYSERR_NOERROR;
}

// ---------------------------------------------------------------------------
// Timer resolution control
// No hardware timer reprogramming at this stage; pretend success so callers
// that wrap their audio/game loop in timeBeginPeriod(1) don't bail out.
// ---------------------------------------------------------------------------
__declspec(dllexport) MMRESULT timeBeginPeriod(unsigned int uPeriod) {
    (void)uPeriod;
    return MMSYSERR_NOERROR;
}

__declspec(dllexport) MMRESULT timeEndPeriod(unsigned int uPeriod) {
    (void)uPeriod;
    return MMSYSERR_NOERROR;
}