/*
//
// Copyright (C) 2006-2026 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 : jvc_loader.c
// Contains: JVC floppy image loader
//
// Written by: Jean-François DEL NERO
//
// Change History (most recent first):
///////////////////////////////////////////////////////////////////////////////////

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

#include "types.h"

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

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

#include "jvc_loader.h"

#include "libhxcadaptor.h"

int JVC_libIsValidDiskFile( HXCFE_IMGLDR * imgldr_ctx, HXCFE_IMGLDR_FILEINFOS * imgfile )
{
	return hxcfe_imgCheckFileCompatibility( imgldr_ctx, imgfile, "JVC_libIsValidDiskFile", "jvc", 0);
}

#pragma pack(1)

typedef struct jvc_header_
{
  uint8_t Setors_per_track;
  uint8_t Side_count;
  uint8_t Sector_size_code;
  uint8_t First_sector_ID;
  uint8_t Sector_attribute_flag;
}jvc_header;

#pragma pack()

int JVC_libLoad_DiskFile(HXCFE_IMGLDR * imgldr_ctx,HXCFE_FLOPPY * floppydisk,char * imgfile,void * parameters)
{
	FILE * f;
	unsigned int filesize;
	int i,j,k,skew;
	int file_offset;
	unsigned char* trackdata = NULL;
	int headerSize;
	int gap3len,interleave;
	int sectorsize,rpm;
	jvc_header jvc_h;
	unsigned char Sector_attribute_flag;
	HXCFE_CYLINDER* currentcylinder = NULL;
	unsigned char trackformat;

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

	if( filesize )
	{
		headerSize = filesize % 256;

		// default values
		jvc_h.Setors_per_track=18;
		jvc_h.Side_count=1;
		jvc_h.Sector_size_code=1;
		jvc_h.First_sector_ID=1;
		jvc_h.Sector_attribute_flag=0;

		hxc_fread(&jvc_h, headerSize,f);

		sectorsize=128<<jvc_h.Sector_size_code;

		floppydisk->floppySectorPerTrack=jvc_h.Setors_per_track;
		floppydisk->floppyNumberOfSide= jvc_h.Side_count;

		if( jvc_h.Sector_attribute_flag)
		{
			floppydisk->floppyNumberOfTrack=(filesize - headerSize) / (jvc_h.Setors_per_track * ((128 << jvc_h.Sector_size_code) + 1) ) / jvc_h.Side_count;
		}
		else
		{
			floppydisk->floppyNumberOfTrack=(filesize - headerSize) / (jvc_h.Setors_per_track * (128 << jvc_h.Sector_size_code)) / jvc_h.Side_count;
		}

		floppydisk->floppyBitRate=DEFAULT_DD_BITRATE;
		floppydisk->floppyiftype=GENERIC_SHUGART_DD_FLOPPYMODE;

		trackformat=ISOFORMAT_DD;
		skew=0;
		interleave=1;
		gap3len=255;

		floppydisk->tracks = (HXCFE_CYLINDER**)malloc(sizeof(HXCFE_CYLINDER*)*floppydisk->floppyNumberOfTrack);
		if( !floppydisk->tracks )
			goto alloc_error;

		rpm=300; // normal rpm

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

		trackdata = (unsigned char*)malloc(sectorsize*floppydisk->floppySectorPerTrack);
		if( !trackdata )
			goto alloc_error;

		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);

				if(jvc_h.Sector_attribute_flag)
					file_offset=((sectorsize+1)*(j*floppydisk->floppySectorPerTrack*floppydisk->floppyNumberOfSide))+
						((sectorsize+1)*(floppydisk->floppySectorPerTrack)*i);
				else
					file_offset=(sectorsize*(j*floppydisk->floppySectorPerTrack*floppydisk->floppyNumberOfSide))+
						(sectorsize*(floppydisk->floppySectorPerTrack)*i);

				fseek (f , file_offset , SEEK_SET);

				Sector_attribute_flag=0;
				for(k=0;k<jvc_h.Setors_per_track;k++)
				{
					if(jvc_h.Sector_attribute_flag)
					{
						hxc_fread(&Sector_attribute_flag,1,f);
					}

					hxc_fread(&trackdata[k*sectorsize],sectorsize,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;

alloc_error:

	if ( f )
		hxc_fclose( f );

	free( trackdata );

	hxcfe_freeFloppy(imgldr_ctx->hxcfe, floppydisk );

	return HXCFE_INTERNALERROR;
}

int JVC_libGetPluginInfo(HXCFE_IMGLDR * imgldr_ctx,uint32_t infotype,void * returnvalue)
{
	static const char plug_id[]="TRS80_JVC";
	static const char plug_desc[]="TRS80 JVC Loader";
	static const char plug_ext[]="jvc";

	plugins_ptr plug_funcs=
	{
		(ISVALIDDISKFILE)   JVC_libIsValidDiskFile,
		(LOADDISKFILE)      JVC_libLoad_DiskFile,
		(WRITEDISKFILE)     0,
		(GETPLUGININFOS)    JVC_libGetPluginInfo
	};

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