//-----------------------------------------------------------------------------
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Low frequency ioProx commands
// FSK2a, rf/64, 64 bits (complete)
//-----------------------------------------------------------------------------

#include "cmdlfio.h"

static int CmdHelp(const char *Cmd);

int usage_lf_io_read(void) {
	PrintAndLog("Enables IOProx compatible reader mode printing details of scanned tags.");
	PrintAndLog("By default, values are printed and logged until the button is pressed or another USB command is issued.");
	PrintAndLog("If the [1] option is provided, reader mode is exited after reading a single card.");
	PrintAndLog("");
	PrintAndLog("Usage:  lf io read [h] [1]");
	PrintAndLog("Options :");
	PrintAndLog("      h :  This help");
	PrintAndLog("      1 : (optional) stop after reading a single card");
	PrintAndLog("");
	PrintAndLog("Samples");
	PrintAndLog("        lf io read");
	PrintAndLog("        lf io read 1");
	return 0;
}

int usage_lf_io_sim(void) {
	PrintAndLog("Enables simulation of IOProx card with specified facility-code and card number.");
	PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
	PrintAndLog("");
	PrintAndLog("Usage:  lf io sim [h] <version> <facility-code> <card-number>");
	PrintAndLog("Options :");
	PrintAndLog("                h :  This help");	
	PrintAndLog("        <version> :  8bit version");
	PrintAndLog("  <facility-code> :  8bit value facility code");
	PrintAndLog("    <card number> :  16bit value card number");
	PrintAndLog("");
	PrintAndLog("Samples");
	PrintAndLog("       lf io sim 26 101 1337");
	return 0;
}

int usage_lf_io_clone(void) {
	PrintAndLog("Enables cloning of IOProx card with specified facility-code and card number onto T55x7.");
	PrintAndLog("The T55x7 must be on the antenna when issuing this command.  T55x7 blocks are calculated and printed in the process.");
	PrintAndLog("");
	PrintAndLog("Usage:  lf io clone [h] <version> <facility-code> <card-number> [Q5]");
	PrintAndLog("Options :");
	PrintAndLog("                h :  This help");	
	PrintAndLog("        <version> :  8bit version");
	PrintAndLog("  <facility-code> :  8bit value facility code");
	PrintAndLog("    <card number> :  16bit value card number");
	PrintAndLog("               Q5 :  optional - clone to Q5 (T5555) instead of T55x7 chip");
	PrintAndLog("");
	PrintAndLog("Samples");
	PrintAndLog("       lf io clone 26 101 1337");
	return 0;
}

// this read is the "normal" read,  which download lf signal and tries to demod here.
int CmdIOProxRead(const char *Cmd) {
	lf_read(true, 12000);
	return CmdIOProxDemod(Cmd);
}
// this read loops on device side.
// uses the demod in lfops.c
int CmdIOProxRead_device(const char *Cmd) {
	if (Cmd[0] == 'h' || Cmd[0] == 'H') return usage_lf_io_read();
	int findone = (Cmd[0]=='1') ? 1 : 0;
	UsbCommand c = {CMD_IO_DEMOD_FSK, {findone, 0, 0}};
	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}

//by marshmellow
//IO-Prox demod - FSK RF/64 with preamble of 000000001
//print ioprox ID and some format details
int CmdIOProxDemod(const char *Cmd) {
	int retval = 0;
	int idx = 0;
	char crcStr[20];
	memset(crcStr, 0x00, sizeof(crcStr) );

	//something in graphbuffer?
	if (GraphTraceLen < 65) {
		if (g_debugMode)PrintAndLog("DEBUG: Error - IO prox not enough samples in GraphBuffer");
		return retval;
	}
	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
	size_t bitlen = getFromGraphBuf(BitStream);
	if (bitlen == 0) return retval;

	int waveIdx = 0;
	//get binary from fsk wave
	idx = detectIOProx(BitStream, &bitlen, &waveIdx);
	if (idx < 0){
		if (g_debugMode){
			if (idx == -1){
				PrintAndLog("DEBUG: Error - IO prox not enough samples");				
			} else if (idx == -2) {
				PrintAndLog("DEBUG: Error - IO prox just noise detected");
			} else if (idx == -3) {
				PrintAndLog("DEBUG: Error - IO prox error during fskdemod");        
			} else if (idx == -4) {
				PrintAndLog("DEBUG: Error - IO prox preamble not found");
			} else if (idx == -5) {
				PrintAndLog("DEBUG: Error - IO prox separator bits not found");
			} else {
				PrintAndLog("DEBUG: Error - IO prox error demoding fsk %d", idx);
			}
		}
		return retval;
	}
	if (idx==0){
		if (g_debugMode){
			PrintAndLog("DEBUG: Error - IO prox data not found - FSK Bits: %d", bitlen);
			if (bitlen > 92) PrintAndLog("%s", sprint_bin_break(BitStream,92,16));
		} 
		return retval;
	}
	//Index map
	//0           10          20          30          40          50          60
	//|           |           |           |           |           |           |
	//01234567 8 90123456 7 89012345 6 78901234 5 67890123 4 56789012 3 45678901 23
	//-----------------------------------------------------------------------------
	//00000000 0 11110000 1 facility 1 version* 1 code*one 1 code*two 1 ???????? 11
	//
	//XSF(version)facility:codeone+codetwo (raw)
	
	if (g_debugMode) {
		PrintAndLog("%d%d%d%d%d%d%d%d %d", BitStream[idx], BitStream[idx+1], BitStream[idx+2], BitStream[idx+3], BitStream[idx+4], BitStream[idx+5], BitStream[idx+6], BitStream[idx+7], BitStream[idx+8]);
		PrintAndLog("%d%d%d%d%d%d%d%d %d", BitStream[idx+9], BitStream[idx+10], BitStream[idx+11],BitStream[idx+12],BitStream[idx+13],BitStream[idx+14],BitStream[idx+15],BitStream[idx+16],BitStream[idx+17]);
		PrintAndLog("%d%d%d%d%d%d%d%d %d facility", BitStream[idx+18], BitStream[idx+19], BitStream[idx+20],BitStream[idx+21],BitStream[idx+22],BitStream[idx+23],BitStream[idx+24],BitStream[idx+25],BitStream[idx+26]);
		PrintAndLog("%d%d%d%d%d%d%d%d %d version", BitStream[idx+27], BitStream[idx+28], BitStream[idx+29],BitStream[idx+30],BitStream[idx+31],BitStream[idx+32],BitStream[idx+33],BitStream[idx+34],BitStream[idx+35]);
		PrintAndLog("%d%d%d%d%d%d%d%d %d code1", BitStream[idx+36], BitStream[idx+37], BitStream[idx+38],BitStream[idx+39],BitStream[idx+40],BitStream[idx+41],BitStream[idx+42],BitStream[idx+43],BitStream[idx+44]);
		PrintAndLog("%d%d%d%d%d%d%d%d %d code2", BitStream[idx+45], BitStream[idx+46], BitStream[idx+47],BitStream[idx+48],BitStream[idx+49],BitStream[idx+50],BitStream[idx+51],BitStream[idx+52],BitStream[idx+53]);
		PrintAndLog("%d%d%d%d%d%d%d%d %d%d checksum", BitStream[idx+54],BitStream[idx+55],BitStream[idx+56],BitStream[idx+57],BitStream[idx+58],BitStream[idx+59],BitStream[idx+60],BitStream[idx+61],BitStream[idx+62],BitStream[idx+63]);
	}
	
	uint32_t code = bytebits_to_byte(BitStream+idx,32);
	uint32_t code2 = bytebits_to_byte(BitStream+idx+32,32);
	uint8_t version = bytebits_to_byte(BitStream+idx+27,8); //14,4
	uint8_t facilitycode = bytebits_to_byte(BitStream+idx+18,8) ;
	uint16_t number = (bytebits_to_byte(BitStream+idx+36,8)<<8)|(bytebits_to_byte(BitStream+idx+45,8)); //36,9
	uint8_t crc = bytebits_to_byte(BitStream+idx+54,8);
	uint16_t calccrc = 0;

	for (uint8_t i = 1; i < 6; ++i){
		calccrc += bytebits_to_byte(BitStream + idx + 9 * i ,8);
	}
	calccrc &= 0xff;
	calccrc = 0xff - calccrc;

	if  (crc == calccrc) {
		snprintf(crcStr, 3, "ok");
		retval = 1;
	} else {
		if (g_debugMode) PrintAndLog("DEBUG: Error - IO prox crc failed");
			
		snprintf(crcStr, 20, "failed 0x%02X != 0x%02X", crc, calccrc);
		retval = 0;
	}

	PrintAndLog("IO Prox XSF(%02d)%02x:%05d (%08x%08x) [crc %s]", version, facilitycode, number, code, code2, crcStr);
	setDemodBuf(BitStream, 64, idx);
	if (g_debugMode){
		PrintAndLog("DEBUG: IO prox idx: %d, Len: %d, Printing demod buffer:", idx, 64);
		printDemodBuff();
	}	
	return retval;
}

//Index map
//0           10          20          30          40          50          60
//|           |           |           |           |           |           |
//01234567 8 90123456 7 89012345 6 78901234 5 67890123 4 56789012 3 45678901 23
//-----------------------------------------------------------------------------
//00000000 0 11110000 1 facility 1 version* 1 code*one 1 code*two 1 ???????? 11
//XSF(version)facility:codeone+codetwo (raw)
int getIOProxBits(uint8_t version, uint8_t fc, uint16_t cn, uint8_t *bits) {
	#define SEPARATOR 1	
	uint8_t pos=0;
	// the return bits, preamble 0000 0000 0
	uint8_t pre[64];
	memset(pre, 0, sizeof(pre));

	// skip 9 zeros as preamble
	pos = 9;
	
	// another fixed byte 11110000 = 0xF0
	num_to_bytebits(0xF0, 8, pre+pos);
	pos += 8;
	pre[pos] = SEPARATOR;
	pos++;	
	
	// add facilitycode
	num_to_bytebits(fc, 8, pre+pos);
	pos += 8;
	pre[pos] = SEPARATOR;
	pos++;
	
	// add version
	num_to_bytebits(version, 8, pre+pos);
	pos += 8;
	pre[pos] = SEPARATOR;
	pos++;
	
	// cardnumber high byte
	num_to_bytebits( ((cn & 0xFF00)>>8), 8, pre+pos);
	pos += 8;
	pre[pos] = SEPARATOR;
	pos++;
	
	// cardnumber low byte
	num_to_bytebits( (cn & 0xFF), 8, pre+pos);
	pos += 8;
	pre[pos] = SEPARATOR;
	pos++;

	// calculate and add CRC
	uint16_t crc = 0;
	for (uint8_t i=1; i<6; ++i)
		crc += bytebits_to_byte(pre+9*i, 8);
	
	crc &= 0xFF;
	crc = 0xff - crc;
	num_to_bytebits(crc, 8, pre+pos);
	pos += 8;
		
	// Final two ONES
	pre[pos] = SEPARATOR;
	pre[++pos] = SEPARATOR;

	memcpy(bits, pre, sizeof(pre));
	return 1;
}

int CmdIOProxSim(const char *Cmd) {
	uint16_t cn = 0;
	uint8_t version = 0, fc = 0;
	uint8_t bits[64];
	size_t size = sizeof(bits);
	memset(bits, 0x00, size);
 
	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_io_sim();
	
  	version = param_get8(Cmd, 0);
	fc = param_get8(Cmd, 1);
	cn = param_get32ex(Cmd, 2, 0, 10);

	if ( !version | !fc || !cn) return usage_lf_io_sim();
	
	if ((cn & 0xFFFF) != cn) {
		cn &= 0xFFFF;
		PrintAndLog("Card Number Truncated to 16-bits (IOProx): %u", cn);
	}
	
	// clock 64, FSK2a fcHIGH 10 | fcLOW 8
	uint8_t clk = 64, invert = 1, high = 10, low = 8;
	uint16_t arg1, arg2;	
	arg1 = high << 8 | low;
	arg2 = invert << 8 | clk;

	PrintAndLog("Emulating IOProx Version: %u FC: %u; CN: %u\n", version, fc, cn);
	PrintAndLog("Press pm3-button to abort simulation or run another command");
	
	if ( !getIOProxBits(version, fc, cn, bits)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}
	// IOProx uses: fcHigh: 10, fcLow: 8, clk: 64, invert: 1
	// arg1 --- fcHigh<<8 + fcLow
	// arg2 --- Invert and clk setting
	// size --- 64 bits == 8 bytes
	UsbCommand c = {CMD_FSK_SIM_TAG, {arg1, arg2, size}};  
	memcpy(c.d.asBytes, bits, size);
	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}

int CmdIOProxClone(const char *Cmd) {
	
	uint32_t blocks[3] = {T55x7_MODULATION_FSK2a | T55x7_BITRATE_RF_64 | 2 << T55x7_MAXBLOCK_SHIFT, 0, 0};
	uint16_t cn = 0;
	uint8_t version = 0, fc = 0;
	uint8_t bits[64];
	uint8_t *bs=bits;
	memset(bs,0,sizeof(bits));
	
	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_io_clone();

  	version = param_get8(Cmd, 0);
	fc = param_get8(Cmd, 1);
	cn = param_get32ex(Cmd, 2, 0, 10);

	if ( !version | !fc || !cn) return usage_lf_io_clone();
	
	if ((cn & 0xFFFF) != cn) {
		cn &= 0xFFFF;
		PrintAndLog("Card Number Truncated to 16-bits (IOProx): %u", cn);
	}
	
	if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
		blocks[0] = T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | T5555_SET_BITRATE(64) | 2 << T5555_MAXBLOCK_SHIFT;

	if ( !getIOProxBits(version, fc, cn, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}	

	blocks[1] = bytebits_to_byte(bs,32);
	blocks[2] = bytebits_to_byte(bs+32,32);

	PrintAndLog("Preparing to clone IOProx to T55x7 with Version: %u FC: %u, CN: %u", version, fc, cn);
	PrintAndLog("Blk | Data ");
	PrintAndLog("----+------------");
	PrintAndLog(" 00 | 0x%08x", blocks[0]);
	PrintAndLog(" 01 | 0x%08x", blocks[1]);
	PrintAndLog(" 02 | 0x%08x", blocks[2]);
	//UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
	UsbCommand c = {CMD_IO_CLONE_TAG, {blocks[1],blocks[2],0}};
	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}

static command_t CommandTable[] = {
	{"help",	CmdHelp,		1, "this help"},
	{"demod",	CmdIOProxDemod,	1, "demodulate an IOProx tag from the GraphBuffer"},
	{"read",	CmdIOProxRead,	1, "attempt to read and extract tag data"},
	{"clone",	CmdIOProxClone,	0, "clone IOProx to T55x7"},
	{"sim",		CmdIOProxSim,	0, "simulate IOProx tag"},
	{NULL, NULL, 0, NULL}
};

int CmdLFIO(const char *Cmd){
	clearCommandBuffer();
	CmdsParse(CommandTable, Cmd);
	return 0; 
}

int CmdHelp(const char *Cmd) {
	CmdsHelp(CommandTable);
	return 0;
}