/*
//
// Copyright (C) 2006-2018 Jean-François DEL NERO
//
// This file is part of the HxCFloppyEmulator library
//
// HxCFloppyEmulator may be used and distributed without restriction provided
// that this copyright statement is not removed from the file and that any
// derivative work contains the original copyright notice and the associated
// disclaimer.
//
// HxCFloppyEmulator 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.
//
// HxCFloppyEmulator 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 HxCFloppyEmulator; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
//
*/
///////////////////////////////////////////////////////////////////////////////////
//-------------------------------------------------------------------------------//
//-------------------------------------------------------------------------------//
//-----------H----H--X----X-----CCCCC----22222----0000-----0000------11----------//
//----------H----H----X-X-----C--------------2---0----0---0----0--1--1-----------//
//---------HHHHHH-----X------C----------22222---0----0---0----0-----1------------//
//--------H----H----X--X----C----------2-------0----0---0----0-----1-------------//
//-------H----H---X-----X---CCCCC-----222222----0000-----0000----1111------------//
//-------------------------------------------------------------------------------//
//----------------------------------------------------- http://hxc2001.free.fr --//
///////////////////////////////////////////////////////////////////////////////////
// File : mgt_loader.c
// Contains: MGT floppy image loader
//
// Written by:	DEL NERO Jean Francois
//
// Change History (most recent first):
///////////////////////////////////////////////////////////////////////////////////

#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "types.h"

#include "internal_libhxcfe.h"
#include "tracks/track_generator.h"
#include "libhxcfe.h"

#include "floppy_loader.h"
#include "floppy_utils.h"

#include "mgt_loader.h"

#include "libhxcadaptor.h"

int MGT_libIsValidDiskFile(HXCFE_IMGLDR * imgldr_ctx,char * imgfile)
{
	int filesize;

	imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"MGT_libIsValidDiskFile");

	if( hxc_checkfileext(imgfile,"sad") ||
		hxc_checkfileext(imgfile,"mgt")
		)
	{

		filesize=hxc_getfilesize(imgfile);
		if(filesize<0)
		{
			imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"MGT_libIsValidDiskFile : Cannot open %s !",imgfile);
			return HXCFE_ACCESSERROR;
		}

		if(filesize&0x1FF)
		{
			imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"MGT_libIsValidDiskFile : non MGT file - bad file size !");
			return HXCFE_BADFILE;
		}

		imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"MGT_libIsValidDiskFile : MGT file !");

		return HXCFE_VALIDFILE;
	}
	else
	{
		imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"MGT_libIsValidDiskFile : non MGT file !");
		return HXCFE_BADFILE;
	}
}



int MGT_libLoad_DiskFile(HXCFE_IMGLDR * imgldr_ctx,HXCFE_FLOPPY * floppydisk,char * imgfile,void * parameters)
{

	FILE * f;
	unsigned int filesize;
	int i,j;
	unsigned int file_offset;
	unsigned char* trackdata;
	int  gap3len,interleave;
	int  sectorsize,rpm;
	int  skew,trackformat;

	HXCFE_CYLINDER* currentcylinder;


	imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"MGT_libLoad_DiskFile %s",imgfile);

	f=hxc_fopen(imgfile,"rb");
	if(f==NULL)
	{
		imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"Cannot open %s !",imgfile);
		return HXCFE_ACCESSERROR;
	}

	filesize = hxc_fgetsize(f);

	switch( filesize )
	{
	case 819200:
		floppydisk->floppyNumberOfTrack=80;
		floppydisk->floppyNumberOfSide=2;
		floppydisk->floppySectorPerTrack=10;
		gap3len=35;
		interleave=1;
		skew=0;

		break;

	default:

		hxc_fclose(f);
		imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"Bad file size:  %d bytes !",filesize);
		return HXCFE_BADFILE;
		break;

	}

	if(filesize!=0)
	{
		sectorsize=512; // st file support only 512bytes/sector floppies.

		// read the first sector
		floppydisk->floppyBitRate=250000;
		floppydisk->floppyiftype=GENERIC_SHUGART_DD_FLOPPYMODE;
		floppydisk->tracks=(HXCFE_CYLINDER**)malloc(sizeof(HXCFE_CYLINDER*)*floppydisk->floppyNumberOfTrack);
		trackformat=ISOFORMAT_DD;
		rpm=300; // normal rpm

		imgldr_ctx->hxcfe->hxc_printf(MSG_INFO_1,"filesize:%dkB, %d tracks, %d side(s), %d sectors/track, gap3:%d, interleave:%d,rpm:%d",filesize/1024,floppydisk->floppyNumberOfTrack,floppydisk->floppyNumberOfSide,floppydisk->floppySectorPerTrack,gap3len,interleave,rpm);

		trackdata=(unsigned char*)malloc(sectorsize*floppydisk->floppySectorPerTrack);

		for(j=0;j<floppydisk->floppyNumberOfTrack;j++)
		{
			floppydisk->tracks[j]=allocCylinderEntry(rpm,floppydisk->floppyNumberOfSide);
			currentcylinder=floppydisk->tracks[j];

			for(i=0;i<floppydisk->floppyNumberOfSide;i++)
			{
				hxcfe_imgCallProgressCallback(imgldr_ctx,(j<<1) + (i&1),floppydisk->floppyNumberOfTrack*2 );

				file_offset=(sectorsize*(j*floppydisk->floppySectorPerTrack*floppydisk->floppyNumberOfSide))+
							(sectorsize*(floppydisk->floppySectorPerTrack)*i);
				fseek (f , file_offset , SEEK_SET);
				hxc_fread(trackdata,sectorsize*floppydisk->floppySectorPerTrack,f);

				currentcylinder->sides[i]=tg_generateTrack(trackdata,sectorsize,floppydisk->floppySectorPerTrack,(unsigned char)j,(unsigned char)i,1,interleave,((j<<1)|(i&1))*skew,floppydisk->floppyBitRate,currentcylinder->floppyRPM,trackformat,gap3len,0,2500|NO_SECTOR_UNDER_INDEX,-2500);
			}
		}

		free(trackdata);

		imgldr_ctx->hxcfe->hxc_printf(MSG_INFO_1,"track file successfully loaded and encoded!");

		hxc_fclose(f);
		return HXCFE_NOERROR;
	}

	imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"file size=%d !?",filesize);
	hxc_fclose(f);
	return HXCFE_BADFILE;
}

int MGT_libGetPluginInfo(HXCFE_IMGLDR * imgldr_ctx,uint32_t infotype,void * returnvalue)
{

	static const char plug_id[]="SAMCOUPE_MGT";
	static const char plug_desc[]="SAM COUPE MGT Loader";
	static const char plug_ext[]="mgt";

	plugins_ptr plug_funcs=
	{
		(ISVALIDDISKFILE)	MGT_libIsValidDiskFile,
		(LOADDISKFILE)		MGT_libLoad_DiskFile,
		(WRITEDISKFILE)		0,
		(GETPLUGININFOS)	MGT_libGetPluginInfo
	};

	return libGetPluginInfo(
			imgldr_ctx,
			infotype,
			returnvalue,
			plug_id,
			plug_desc,
			&plug_funcs,
			plug_ext
			);
}

