/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2006 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
 *
 * amd.cpp - AMD Loader by Simon Peter <dn.tlp@gmx.net>
 */

#include <string.h>

#include "amd.h"
#include "debug.h"

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

bool CamdLoader::load(const std::string &filename, const CFileProvider &fp)
{
        binistream *f = fp.open(filename); if(!f) return false;
	struct {
		char id[9];
		unsigned char version;
	} header;
	int i, j, k, t, numtrax, maxi = 0;
	unsigned char buf, buf2, buf3;
	const unsigned char convfx[10] = {0,1,2,9,17,11,13,18,3,14};
  const unsigned char convvol[64] = {
    0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 9, 9, 0xa, 0xa, 0xb,
    0xc, 0xc, 0xd, 0xe, 0xe, 0xf, 0x10, 0x10, 0x11, 0x12, 0x13, 0x14, 0x14,
    0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x21,
    0x22, 0x23, 0x25, 0x26, 0x28, 0x29, 0x2b, 0x2d, 0x2e, 0x30, 0x32, 0x35,
    0x37, 0x3a, 0x3c, 0x3f
  };

	// file validation section
	if(fp.filesize(f) < 1072) { fp.close(f); return false; }
	f->seek(1062); f->readString(header.id, 9);
	header.version = f->readInt(1);
	if(strncmp(header.id, "<o\xefQU\xeeRoR", 9) &&
	   strncmp(header.id, "MaDoKaN96", 9)) { fp.close(f); return false; }

	// load section
	memset(inst, 0, sizeof(inst));
	f->seek(0);
	f->readString(songname, sizeof(songname));
	f->readString(author, sizeof(author));
	for(i = 0; i < 26; i++) {
		f->readString(instname[i], 23);
		for(j = 0; j < 11; j++) inst[i].data[j] = f->readInt(1);
	}
	length = f->readInt(1); nop = f->readInt(1) + 1;
	for(i=0;i<128;i++) order[i] = f->readInt(1);
	f->seek(10, binio::Add);
	if(header.version == 0x10) {	// unpacked module
	maxi = nop * 9;
		for(i=0;i<64*9;i++)
			trackord[i/9][i%9] = i+1;
		t = 0;
		while(!f->ateof()) {
			for(j=0;j<64;j++)
				for(i=t;i<t+9;i++) {
					buf = f->readInt(1);
					tracks[i][j].param2 = (buf&127) % 10;
					tracks[i][j].param1 = (buf&127) / 10;
					buf = f->readInt(1);
					tracks[i][j].inst = buf >> 4;
					tracks[i][j].command = buf & 0x0f;
					buf = f->readInt(1);
					if(buf >> 4)	// fix bug in AMD save routine
						tracks[i][j].note = ((buf & 14) >> 1) * 12 + (buf >> 4);
					else
						tracks[i][j].note = 0;
					tracks[i][j].inst += (buf & 1) << 4;
				}
			t += 9;
		}
	} else {						// packed module
		for(i=0;i<nop;i++)
		  for(j=0;j<9;j++)
		    trackord[i][j] = f->readInt(2) + 1;
		numtrax = f->readInt(2);
		for(k=0;k<numtrax;k++) {
			i = f->readInt(2);
			if(i > 575) i = 575;	// fix corrupted modules
			maxi = (i + 1 > maxi ? i + 1 : maxi);
			j = 0;
			do {
				buf = f->readInt(1);
				if(buf & 128) {
					for(t = j; t < j + (buf & 127) && t < 64; t++) {
						tracks[i][t].command = 0;
						tracks[i][t].inst = 0;
						tracks[i][t].note = 0;
						tracks[i][t].param1 = 0;
						tracks[i][t].param2 = 0;
					}
					j += buf & 127;
					continue;
				}
				tracks[i][j].param2 = buf % 10;
				tracks[i][j].param1 = buf / 10;
				buf = f->readInt(1);
				tracks[i][j].inst = buf >> 4;
				tracks[i][j].command = buf & 0x0f;
				buf = f->readInt(1);
				if(buf >> 4)	// fix bug in AMD save routine
					tracks[i][j].note = ((buf & 14) >> 1) * 12 + (buf >> 4);
				else
					tracks[i][j].note = 0;
				tracks[i][j].inst += (buf & 1) << 4;
				j++;
			} while(j<64);
		}
	}
	fp.close(f);

	// convert to protracker replay data
	bpm = 50; restartpos = 0; activechan = 0xffff; flags = Decimal;
	for(i=0;i<26;i++) {	// convert instruments
		buf = inst[i].data[0];
		buf2 = inst[i].data[1];
		inst[i].data[0] = inst[i].data[10];
		inst[i].data[1] = buf;
		buf = inst[i].data[2];
		inst[i].data[2] = inst[i].data[5];
		buf3 = inst[i].data[3];
		inst[i].data[3] = buf;
		buf = inst[i].data[4];
		inst[i].data[4] = inst[i].data[7];
		inst[i].data[5] = buf3;
		buf3 = inst[i].data[6];
		inst[i].data[6] = inst[i].data[8];
		inst[i].data[7] = buf;
		inst[i].data[8] = inst[i].data[9];
		inst[i].data[9] = buf2;
		inst[i].data[10] = buf3;
		for(j=0;j<23;j++)	// convert names
			if(instname[i][j] == '\xff')
				instname[i][j] = '\x20';
	}
  for(i=0;i<maxi;i++)	// convert patterns
		for(j=0;j<64;j++) {
			tracks[i][j].command = convfx[tracks[i][j].command];
			// extended command
			if(tracks[i][j].command == 14) {
				if(tracks[i][j].param1 == 2) {
					tracks[i][j].command = 10;
					tracks[i][j].param1 = tracks[i][j].param2;
					tracks[i][j].param2 = 0;
				}

				if(tracks[i][j].param1 == 3) {
					tracks[i][j].command = 10;
					tracks[i][j].param1 = 0;
				}
			}

      // fix volume
      if(tracks[i][j].command == 17) {
	int vol = convvol[tracks[i][j].param1 * 10 + tracks[i][j].param2];

	if(vol > 63) vol = 63;
	tracks[i][j].param1 = vol / 10;
	tracks[i][j].param2 = vol % 10;
      }
		}

	rewind(0);
	return true;
}

float CamdLoader::getrefresh()
{
	if(tempo)
		return (float) (tempo);
	else
		return 18.2f;
}
