/***************************************************************************
 camd-midi.c Copyright (C) 2005--08 Walter van Niftrik, Christoph Reichenbach


 This program may be modified and copied freely according to the terms of
 the GNU general public license (GPL), as long as the above copyright
 notice and the licensing information contained herein are preserved.

 Please refer to www.gnu.org for licensing details.

 This work is provided AS IS, without warranty of any kind, expressed or
 implied, including but not limited to the warranties of merchantibility,
 noninfringement, and fitness for a specific purpose. The author will not
 be held liable for any damage caused by this work or derivatives of it.

 By using this source code, you agree to the licensing terms as stated
 above.


 Please contact the maintainer for bug reports or inquiries.

 Current Maintainer:

    Walter van Niftrik <w.f.b.w.v.niftrik@stud.tue.nl>

***************************************************************************/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif
#ifdef HAVE_PROTO_CAMD_H

#include "sfx_engine.h"
#include "../device.h"

#include <proto/camd.h>
#include <proto/dos.h>
#include <proto/exec.h>
#include <proto/intuition.h>
#include <stdio.h>


#define SWAP_BYTES
#define FILL_BYTES

#define SCI_CAMD_MIDI_VERSION "0.1"
#define SYSEX_PREFIX 0xf0

static const char *devicename = "via686.out.0";

struct Library *CamdBase = NULL;
struct CamdIFace *ICamd = NULL;
static struct MidiLink *midi_link = NULL;
static struct MidiNode *midi_node = NULL;

#define ABORT(m) {						\
			if (CamdBase)				\
                   		IExec->CloseLibrary(CamdBase);	\
			sciprintf("[SFX] CAMD driver: ");	\
			sciprintf(m);				\
			sciprintf("\n");			\
			return SFX_ERROR;			\
	}

static int
camd_init(midi_writer_t *self) {
	sciprintf("[SFX] Initialising CAMD raw MIDI backend, v%s\n", SCI_CAMD_MIDI_VERSION);

	CamdBase = IExec->OpenLibrary("camd.library", 36L);
	if (!CamdBase)
		ABORT("Could not open 'camd.library'");

	ICamd = (struct CamdIFace *) IExec->GetInterface(CamdBase, "main", 1, NULL);
	if (!ICamd)
		ABORT("Error while retrieving CAMD interface\n");

	midi_node = ICamd->CreateMidi(MIDI_MsgQueue, 0L, MIDI_SysExSize, 4096L, MIDI_Name, "freesci", TAG_END);
	if (!midi_node)
		ABORT("Could not create CAMD MIDI node");

	midi_link = ICamd->AddMidiLink(midi_node, MLTYPE_Sender, MLINK_Location, devicename, TAG_END);
	if (!midi_link)
		ABORT(("Could not create CAMD MIDI link to '%s'", devicename));

	sciprintf("[SFX] CAMD initialisation completed\n");

	return SFX_OK;
}

static int
camd_set_option(midi_writer_t *self, char *name, char *value) {
	return SFX_ERROR;
}

#define MAX_MIDI_LEN 3

static int
camd_write(midi_writer_t *self, unsigned char *buffer, int len) {
	if (len == 0)
		return SFX_OK;

	if (buffer[0] == SYSEX_PREFIX) {
		/* Must send this as a SysEx */
		ICamd->PutSysEx(midi_link, buffer);
	} else {
		ULONG data = 0l;
		int i;
		int readlen = (len > MAX_MIDI_LEN) ? MAX_MIDI_LEN : len;

		for (i = 0; i < readlen; i++)
			if (len >= i) {
				data <<= 8;
				data |= buffer[i];
			}
		data <<= (8 * (sizeof(ULONG) - readlen));

		if (len > MAX_MIDI_LEN)
			sciprintf("[SFX] Warning: Truncated MIDI message to fit CAMD format (sent %d: %02x %02x %02x, real length %d)\n",
			          MAX_MIDI_LEN, buffer[0], buffer[1], buffer[2], len);

		ICamd->PutMidi(midi_link, data);
	}

	return SFX_OK;
}

static void
camd_delay(midi_writer_t *self, int ticks) {
}

static void
camd_reset_timer(midi_writer_t *self) {
}

static void
camd_close(midi_writer_t *self) {
#ifdef NO_OP
	return;
#endif
	if (CamdBase)
		IExec->CloseLibrary(CamdBase);
}

midi_writer_t sfx_device_midi_camd = {
	"camd-midi",
	&camd_init,
	&camd_set_option,
	&camd_write,
	&camd_delay,
	NULL,
	&camd_reset_timer,
	&camd_close
};

#endif /* HAVE_PROTO_CAMD_H */