/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2003 Simon Peter, <dn.tlp@gmx.net>, et al.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * sa2.cpp - SAdT2 Loader by Simon Peter <dn.tlp@gmx.net>
 *           SAdT Loader by Mamiya <mamiya@users.sourceforge.net>
 */

#include <stdio.h>

#include "sa2.h"
#include "debug.h"

CPlayer *Csa2Loader::factory(Copl *newopl)
{
  return new Csa2Loader(newopl);
}

bool Csa2Loader::load(const std::string &filename, const CFileProvider &fp)
{
        binistream *f = fp.open(filename); if(!f) return false;
	struct {
		unsigned char data[11],arpstart,arpspeed,arppos,arpspdcnt;
	} insts;
	unsigned char buf;
	int i,j, k, notedis = 0;
	const unsigned char convfx[16] = {0,1,2,3,4,5,6,255,8,255,10,11,12,13,255,15};
	unsigned char sat_type;
	enum SAT_TYPE {
		HAS_ARPEGIOLIST = (1 << 7),
		HAS_V7PATTERNS = (1 << 6),
		HAS_ACTIVECHANNELS = (1 << 5),
		HAS_TRACKORDER = (1 << 4),
		HAS_ARPEGIO = (1 << 3),
		HAS_OLDBPM = (1 << 2),
		HAS_OLDPATTERNS = (1 << 1),
		HAS_UNKNOWN127 = (1 << 0)
	};

	// read header
	f->readString(header.sadt, 4);
	header.version = f->readInt(1);

	// file validation section
	if(strncmp(header.sadt,"SAdT",4)) { fp.close(f); return false; }
	switch(header.version) {
	case 1:
		notedis = +0x18;
		sat_type = HAS_UNKNOWN127 | HAS_OLDPATTERNS | HAS_OLDBPM;
		break;
	case 2:
		notedis = +0x18;
		sat_type = HAS_OLDPATTERNS | HAS_OLDBPM;
		break;
	case 3:
		notedis = +0x0c;
		sat_type = HAS_OLDPATTERNS | HAS_OLDBPM;
		break;
	case 4:
		notedis = +0x0c;
		sat_type = HAS_ARPEGIO | HAS_OLDPATTERNS | HAS_OLDBPM;
		break;
	case 5:
		notedis = +0x0c;
		sat_type = HAS_ARPEGIO | HAS_ARPEGIOLIST | HAS_OLDPATTERNS | HAS_OLDBPM;
		break;
	case 6:
		sat_type = HAS_ARPEGIO | HAS_ARPEGIOLIST | HAS_OLDPATTERNS | HAS_OLDBPM;
		break;
	case 7:
		sat_type = HAS_ARPEGIO | HAS_ARPEGIOLIST | HAS_V7PATTERNS;
		break;
	case 8:
		sat_type = HAS_ARPEGIO | HAS_ARPEGIOLIST | HAS_TRACKORDER;
		break;
	case 9:
		sat_type = HAS_ARPEGIO | HAS_ARPEGIOLIST | HAS_TRACKORDER | HAS_ACTIVECHANNELS;
		break;
	default:	/* unknown */
	        fp.close(f);
		return false;
	}

	// load section
	// instruments
	for(i = 0; i < 31; i++) {
		if(sat_type & HAS_ARPEGIO) {
		        for(j = 0; j < 11; j++) insts.data[j] = f->readInt(1);
			insts.arpstart = f->readInt(1);
			insts.arpspeed = f->readInt(1);
			insts.arppos = f->readInt(1);
			insts.arpspdcnt = f->readInt(1);
			inst[i].arpstart = insts.arpstart;
			inst[i].arpspeed = insts.arpspeed;
			inst[i].arppos = insts.arppos;
			inst[i].arpspdcnt = insts.arpspdcnt;
		} else {
		        for(j = 0; j < 11; j++) insts.data[j] = f->readInt(1);
			inst[i].arpstart = 0;
			inst[i].arpspeed = 0;
			inst[i].arppos = 0;
			inst[i].arpspdcnt = 0;
		}
		for(j=0;j<11;j++)
			inst[i].data[j] = insts.data[j];
		inst[i].misc = 0;
		inst[i].slide = 0;
	}

	// instrument names
	for(i = 0; i < 29; i++) f->readString(instname[i], 17);

	f->ignore(3);		// dummy bytes
	for(i = 0; i < 128; i++) order[i] = f->readInt(1);	// pattern orders
	if(sat_type & HAS_UNKNOWN127) f->ignore(127);

	// infos
	nop = f->readInt(2); length = f->readInt(1); restartpos = f->readInt(1);

	// bpm
	bpm = f->readInt(2);
	if(sat_type & HAS_OLDBPM) {
		bpm = bpm * 125 / 50;		// cps -> bpm
	}

	if(sat_type & HAS_ARPEGIOLIST) {
	  init_specialarp();
	  for(i = 0; i < 256; i++) arplist[i] = f->readInt(1);	// arpeggio list
	  for(i = 0; i < 256; i++) arpcmd[i] = f->readInt(1);	// arpeggio commands
	}

	for(i=0;i<64;i++) {				// track orders
	  for(j=0;j<9;j++) {
	    if(sat_type & HAS_TRACKORDER)
	      trackord[i][j] = f->readInt(1);
	    else
	      {
		trackord[i][j] = i * 9 + j;
	      }
	  }
	}

	if(sat_type & HAS_ACTIVECHANNELS)
	        activechan = f->readInt(2);		// active channels
	else
		activechan = 0xffff;

        AdPlug_LogWrite("Csa2Loader::load(\"%s\"): sat_type = %x, nop = %d, "
		 "length = %d, restartpos = %d, activechan = %x, bpm = %d\n",
		 filename.c_str(), sat_type, nop, length, restartpos, activechan, bpm);

	// track data
	if(sat_type & HAS_OLDPATTERNS) {
		i = 0;
		while(!f->ateof()) {
			for(j=0;j<64;j++) {
				for(k=0;k<9;k++) {
					buf = f->readInt(1);
					tracks[i+k][j].note = buf ? (buf + notedis) : 0;
					tracks[i+k][j].inst = f->readInt(1);
					tracks[i+k][j].command = convfx[f->readInt(1) & 0xf];
					tracks[i+k][j].param1 = f->readInt(1);
					tracks[i+k][j].param2 = f->readInt(1);
				}
			}
			i+=9;
		}
	} else
	  if(sat_type & HAS_V7PATTERNS) {
		i = 0;
		while(!f->ateof()) {
			for(j=0;j<64;j++) {
				for(k=0;k<9;k++) {
					buf = f->readInt(1);
					tracks[i+k][j].note = buf >> 1;
					tracks[i+k][j].inst = (buf & 1) << 4;
					buf = f->readInt(1);
					tracks[i+k][j].inst += buf >> 4;
					tracks[i+k][j].command = convfx[buf & 0x0f];
					buf = f->readInt(1);
					tracks[i+k][j].param1 = buf >> 4;
					tracks[i+k][j].param2 = buf & 0x0f;
				}
			}
			i+=9;
		}
	  } else {
		i = 0;
		while(!f->ateof()) {
			for(j=0;j<64;j++) {
				buf = f->readInt(1);
				tracks[i][j].note = buf >> 1;
				tracks[i][j].inst = (buf & 1) << 4;
				buf = f->readInt(1);
				tracks[i][j].inst += buf >> 4;
				tracks[i][j].command = convfx[buf & 0x0f];
				buf = f->readInt(1);
				tracks[i][j].param1 = buf >> 4;
				tracks[i][j].param2 = buf & 0x0f;
			}
			i++;
		}
	  }
	fp.close(f);

	// fix instrument names
	for(i=0;i<29;i++)
		for(j=0;j<17;j++)
			if(!instname[i][j])
				instname[i][j] = ' ';

	rewind(0);		// rewind module
	return true;
}

std::string Csa2Loader::gettype()
{
	char tmpstr[40];

	sprintf(tmpstr,"Surprise! Adlib Tracker 2 (version %d)",header.version);
	return std::string(tmpstr);
}

std::string Csa2Loader::gettitle()
{
	char bufinst[29*17],buf[18];
	int i,ptr;

	// parse instrument names for song name
	memset(bufinst,'\0',29*17);
	for(i=0;i<29;i++) {
		buf[16] = ' '; buf[17] = '\0';
		memcpy(buf,instname[i]+1,16);
		for(ptr=16;ptr>0;ptr--)
			if(buf[ptr] == ' ')
				buf[ptr] = '\0';
			else {
				if(ptr<16)
					buf[ptr+1] = ' ';
				break;
			}
		strcat(bufinst,buf);
	}

	if(strchr(bufinst,'"'))
		return std::string(bufinst,strchr(bufinst,'"')-bufinst+1,strrchr(bufinst,'"')-strchr(bufinst,'"')-1);
	else
		return std::string();
}
