/*
 * Schism Tracker - a cross-platform Impulse Tracker clone
 * copyright (c) 2003-2005 Storlek <storlek@rigelseven.com>
 * copyright (c) 2005-2008 Mrs. Brisby <mrs.brisby@nimh.org>
 * copyright (c) 2009 Storlek & Mrs. Brisby
 * copyright (c) 2010-2012 Storlek
 * URL: http://schismtracker.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "headers.h"
#include "sdlmain.h"

#include "log.h"
#include "midi.h"

#include "util.h"

#include <windows.h>
#include <mmsystem.h>
#include <stdio.h>

#ifndef WIN32
# error You have no winmm. Why are you trying to build this file?
#endif


struct win32mm_midi {
        DWORD id;

        HMIDIOUT out;
        HMIDIIN in;

        MIDIINCAPS icp;
        MIDIOUTCAPS ocp;

        MIDIHDR hh;
        LPMIDIHDR obuf;
        unsigned char sysx[1024];
};
static unsigned int mm_period = 0;
static unsigned int last_known_in_port = 0;
static unsigned int last_known_out_port = 0;

static MMRESULT (*XP_timeGetDevCaps)(LPTIMECAPS caps, UINT size) = 0;
static MMRESULT (*XP_timeBeginPeriod)(UINT period) = 0;
static MMRESULT (*XP_timeSetEvent)(UINT u,UINT r,LPTIMECALLBACK proc,
                        DWORD_PTR user, UINT flags) = 0;

static void _win32mm_sysex(LPMIDIHDR *q, const unsigned char *d, unsigned int len)
{
        char *z;
        LPMIDIHDR m;

        if (!d) len=0;
        z = mem_alloc(sizeof(MIDIHDR) + len);
        m = (LPMIDIHDR)z;

        memset(m, 0, sizeof(MIDIHDR));
        if (len) memcpy(z + sizeof(MIDIHDR), d, len);

        m->lpData = (z+sizeof(MIDIHDR));
        m->dwBufferLength = len;
        m->lpNext = *q;
        m->dwOffset = 0;
        (*q) = (m);
}
static void _win32mm_send(struct midi_port *p, const unsigned char *data,
                unsigned int len, UNUSED unsigned int delay)
{
        struct win32mm_midi *m;
        DWORD q;

        if (len == 0) return;

        m = p->userdata;
        if (len <= 4) {
                q = data[0];
                if (len > 1) q |= (data[1] << 8);
                if (len > 2) q |= (data[2] << 16);
                if (len > 3) q |= (data[3] << 24); /* eh... */
                (void)midiOutShortMsg(m->out, q);
        } else {
                /* SysEX */
                _win32mm_sysex(&m->obuf, data, len);
                if (midiOutPrepareHeader(m->out, m->obuf, sizeof(MIDIHDR)) == MMSYSERR_NOERROR) {
                        (void)midiOutLongMsg(m->out, m->obuf, sizeof(MIDIHDR));
                }
        }
}




struct curry {
        struct midi_port *p;
        unsigned char *d;
        unsigned int len;
};


static CALLBACK void _win32mm_xp_output(UNUSED UINT uTimerID,
                        UNUSED UINT uMsg,
                        DWORD_PTR dwUser,
                        UNUSED DWORD_PTR dw1,
                        UNUSED DWORD_PTR dw2)
{
        struct curry *c;
        c = (struct curry *)dwUser;
        _win32mm_send(c->p, c->d, c->len, 0);
        free(c);
}
static void _win32mm_send_xp(struct midi_port *p, const unsigned char *buf,
                unsigned int len, unsigned int delay)
{
        /* version for windows XP */
        struct curry *c;

        if (!delay) _win32mm_send(p,buf,len,0);
        if (len == 0) return;

        c = mem_alloc(sizeof(struct curry) + len);
        c->p = p;
        c->d = ((unsigned char*)c)+sizeof(struct curry);
        c->len = len;
        XP_timeSetEvent(delay, mm_period, _win32mm_xp_output, (DWORD_PTR)c,
                                        TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
}

static CALLBACK void  _win32mm_inputcb(UNUSED HMIDIIN in, UINT wmsg, DWORD inst,
                                                DWORD param1, UNUSED DWORD param2)
{
        struct midi_port *p = (struct midi_port *)inst;
        struct win32mm_midi *m;
        unsigned char c[4];

        switch (wmsg) {
        case MIM_OPEN:
                SDL_Delay(0); /* eh? */
        case MIM_CLOSE:
                break;
        case MIM_DATA:
                c[0] = param1 & 255;
                c[1] = (param1 >> 8) & 255;
                c[2] = (param1 >> 16) & 255;
                midi_received_cb(p, c, 3);
                break;
        case MIM_LONGDATA:
                /* long data */
                m = p->userdata;
                midi_received_cb(p, (unsigned char *) m->hh.lpData, m->hh.dwBytesRecorded);
                m->hh.dwBytesRecorded = 0;
                (void)midiInAddBuffer(m->in, &m->hh, sizeof(MIDIHDR));
                break;
        }
}


static int _win32mm_start(struct midi_port *p)
{
        struct win32mm_midi *m;
        UINT id;
        WORD r;

        m = p->userdata;
        id = m->id;
        if (p->io == MIDI_INPUT) {
                m->in = NULL;
                r = midiInOpen(&m->in,
                                (UINT_PTR)id,
                                (DWORD_PTR)_win32mm_inputcb,
                                (DWORD_PTR)p,
                                CALLBACK_FUNCTION);
                if (r != MMSYSERR_NOERROR) return 0;
                memset(&m->hh, 0, sizeof(m->hh));
                m->hh.lpData = (LPSTR)m->sysx;
                m->hh.dwBufferLength = sizeof(m->sysx);
                m->hh.dwFlags = 0;
                r = midiInPrepareHeader(m->in, &m->hh, sizeof(MIDIHDR));
                if (r != MMSYSERR_NOERROR) return 0;
                r = midiInAddBuffer(m->in, &m->hh, sizeof(MIDIHDR));
                if (r != MMSYSERR_NOERROR) return 0;
                if (midiInStart(m->in) != MMSYSERR_NOERROR) return 0;

        }
        if (p->io & MIDI_OUTPUT) {
                m->out = NULL;
                if (midiOutOpen(&m->out,
                                (UINT_PTR)id,
                                0, 0,
                                CALLBACK_NULL) != MMSYSERR_NOERROR) return 0;
        }
        return 1;
}
static int _win32mm_stop(struct midi_port *p)
{
        struct win32mm_midi *m;
        LPMIDIHDR ptr;

        m = p->userdata;
        if (p->io & MIDI_INPUT) {
                /* portmidi appears to (essentially) ignore the error codes
                for these guys */
                (void)midiInStop(m->in);
                (void)midiInReset(m->in);
                (void)midiInClose(m->in);
        }
        if (p->io & MIDI_OUTPUT) {
                (void)midiOutReset(m->out);
                (void)midiOutClose(m->out);
                /* free output chain */
                ptr = m->obuf;
                while (ptr) {
                        m->obuf = m->obuf->lpNext;
                        (void)free(m->obuf);
                        ptr = m->obuf;
                }
        }
        return 1;
}


static void _win32mm_poll(struct midi_provider *p)
{
        struct win32mm_midi *data;

        UINT i;
        UINT mmin, mmout;
        WORD r;

        mmin = midiInGetNumDevs();
        for (i = last_known_in_port; i < mmin; i++) {
                data = mem_alloc(sizeof(struct win32mm_midi));
                memset(data,0,sizeof(struct win32mm_midi));
                r = midiInGetDevCaps(i, (LPMIDIINCAPS)&data->icp,
                                        sizeof(MIDIINCAPS));
                if (r != MMSYSERR_NOERROR) {
                        free(data);
                        continue;
                }
                data->id = i;
                midi_port_register(p, MIDI_INPUT, data->icp.szPname, data, 1);
        }
        last_known_in_port = mmin;

        mmout = midiOutGetNumDevs();
        for (i = last_known_out_port; i < mmout; i++) {
                data = mem_alloc(sizeof(struct win32mm_midi));
                memset(data,0,sizeof(struct win32mm_midi));
                r = midiOutGetDevCaps(i, (LPMIDIOUTCAPS)&data->ocp,
                                        sizeof(MIDIOUTCAPS));
                if (r != MMSYSERR_NOERROR) {
                        if (data) free(data);
                        continue;
                }
                data->id = i;
                midi_port_register(p, MIDI_OUTPUT, data->ocp.szPname, data, 1);
        }
        last_known_out_port = mmout;
}

int win32mm_midi_setup(void)
{
        static struct midi_driver driver;
        HINSTANCE winmm;
        TIMECAPS caps;

        memset(&driver, 0, sizeof(driver));

        driver.flags = 0;
        driver.poll = _win32mm_poll;
        driver.thread = NULL;
        driver.enable = _win32mm_start;
        driver.disable = _win32mm_stop;

        // FIXME: explanation required
        winmm = GetModuleHandle("WINMM.DLL");
        if (!winmm) winmm = LoadLibrary("WINMM.DLL");
        if (!winmm) winmm = GetModuleHandle("WINMM.DLL");
        if (winmm) {
                XP_timeGetDevCaps = (void*)GetProcAddress(winmm,"timeGetDevCaps");
                XP_timeBeginPeriod = (void*)GetProcAddress(winmm,"timeBeginPeriod");
                XP_timeSetEvent = (void*)GetProcAddress(winmm,"timeSetEvent");

                if (XP_timeSetEvent && XP_timeBeginPeriod && XP_timeSetEvent) {
                        if (XP_timeGetDevCaps(&caps, sizeof(caps)) == 0) {
                                mm_period = caps.wPeriodMin;
                                if (XP_timeBeginPeriod(mm_period) == 0) {
                                        driver.send = _win32mm_send_xp;
                                        driver.flags |= MIDI_PORT_CAN_SCHEDULE;
                                } else {
                                        driver.send = _win32mm_send;
                                        log_appendf(4, "Cannot install WINMM timer (midi output will skip)");
                                }
                        } else {
                                driver.send = _win32mm_send;
                                log_appendf(4, "Cannot get WINMM timer capabilities (midi output will skip)");
                        }
                } else {
                        driver.send = _win32mm_send;
                        log_appendf(4, "WINMM is too old a version (midi output will skip)");
                }
        } else {
                driver.send = _win32mm_send;
                log_appendf(4, "WINMM is not installed (midi output will skip)");
        }

        if (!midi_provider_register("Win32MM", &driver)) return 0;

        return 1;
}

