//-----------------------------------------------------------------------------
//
// 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 Farpoint / Pyramid tag commands
// FSK2a, rf/50, 128 bits (complete)
//-----------------------------------------------------------------------------
#include "cmdlfpyramid.h"

static int CmdHelp(const char *Cmd);

int usage_lf_pyramid_clone(void){
	PrintAndLog("clone a Farpointe/Pyramid tag to a T55x7 tag.");
	PrintAndLog("The facility-code is 8-bit and the card number is 16-bit.  Larger values are truncated. ");
	PrintAndLog("Currently only works on 26bit");
	PrintAndLog("");
	PrintAndLog("Usage: lf pyramid clone [h] <Facility-Code> <Card-Number> [Q5]");
	PrintAndLog("Options :");
	PrintAndLog("  h               : this help");
	PrintAndLog("  <Facility-Code> :  8-bit value facility code");
	PrintAndLog("  <Card Number>   : 16-bit value card number");
	PrintAndLog("  Q5              : optional - clone to Q5 (T5555) instead of T55x7 chip");
	PrintAndLog("");
	PrintAndLog("Sample  : lf pyramid clone 123 11223");
	return 0;
}

int usage_lf_pyramid_sim(void) {
	PrintAndLog("Enables simulation of Farpointe/Pyramid card with specified card number.");
	PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
	PrintAndLog("The facility-code is 8-bit and the card number is 16-bit.  Larger values are truncated.");
	PrintAndLog("Currently work only on 26bit");
	PrintAndLog("");
	PrintAndLog("Usage:  lf pyramid sim [h] <Facility-Code> <Card-Number>");
	PrintAndLog("Options :");
	PrintAndLog("  h               : this help");
	PrintAndLog("  <Facility-Code> :  8-bit value facility code");
	PrintAndLog("  <Card Number>   : 16-bit value card number");
	PrintAndLog("");
	PrintAndLog("Sample  : lf pyramid sim 123 11223");
	return 0;
}

// by marshmellow
// FSK Demod then try to locate a Farpointe Data (pyramid) ID
int detectPyramid(uint8_t *dest, size_t *size, int *waveStartIdx) {
	//make sure buffer has data
	if (*size < 128*50) return -1;

	//test samples are not just noise
	signal_t *sp = getSignalProperties();
	if (sp->isnoise) return -2;

	// FSK demodulator RF/50 FSK 10,8
	*size = fskdemod(dest, *size, 50, 0, 10, 8, waveStartIdx);  // pyramid fsk2

	//did we get a good demod?
	if (*size < 128) return -3;

	size_t startIdx = 0;
	uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1};
	if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
		return -4; //preamble not found

	// wrong size?  (between to preambles)
	if (*size != 128) return -5;

	return (int)startIdx;
}

// Works for 26bits.
int GetPyramidBits(uint32_t fc, uint32_t cn, uint8_t *pyramidBits) {

	uint8_t pre[128];
	memset(pre, 0x00, sizeof(pre));

	// format start bit
	pre[79] = 1;
	
	// Get 26 wiegand from FacilityCode, CardNumber	
	uint8_t wiegand[24];
	memset(wiegand, 0x00, sizeof(wiegand));
	num_to_bytebits(fc, 8, wiegand);
	num_to_bytebits(cn, 16, wiegand+8);

	// add wiegand parity bits (dest, source, len)
	wiegand_add_parity(pre+80, wiegand, 24);
	
	// add paritybits	(bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
	addParity(pre+8, pyramidBits+8, 102, 8, 1);

	// add checksum		
	uint8_t csBuff[13];
	for (uint8_t i = 0; i < 13; i++)
		csBuff[i] = bytebits_to_byte(pyramidBits + 16 + (i*8), 8);

	uint32_t crc = CRC8Maxim(csBuff, 13);
	num_to_bytebits(crc, 8, pyramidBits+120);
	return 1;
}

//by marshmellow
//Pyramid Prox demod - FSK RF/50 with preamble of 0000000000000001  (always a 128 bit data stream)
//print full Farpointe Data/Pyramid Prox ID and some bit format details if found
int CmdPyramidDemod(const char *Cmd) {
	//raw fsk demod no manchester decoding no start bit finding just get binary from wave
	uint8_t bits[MAX_GRAPH_TRACE_LEN]={0};
	size_t size = getFromGraphBuf(bits);
	if (size==0) {
		PrintAndLog("DEBUG: Error - Pyramid not enough samples");
		return 0;
	}
	//get binary from fsk wave
	int waveIdx=0;
	int idx = detectPyramid(bits, &size, &waveIdx);
	if (idx < 0){
		if (g_debugMode){
			if (idx == -1)
				PrintAndLog("DEBUG: Error - Pyramid: not enough samples");
			else if (idx == -2)
				PrintAndLog("DEBUG: Error - Pyramid: only noise found");
			else if (idx == -3)
				PrintAndLog("DEBUG: Error - Pyramid: problem during FSK demod");
			else if (idx == -4)
				PrintAndLog("DEBUG: Error - Pyramid: preamble not found");				
			else if (idx == -5)
				PrintAndLog("DEBUG: Error - Pyramid: size not correct: %d", size);
			else
				PrintAndLog("DEBUG: Error - Pyramid: error demoding fsk idx: %d",idx);
		}
		return 0;
	}
	setDemodBuf(bits, size, idx);
	setClockGrid(50, waveIdx + (idx*50));
	
	// Index map
	// 0           10          20          30            40          50          60
	// |           |           |           |             |           |           |
	// 0123456 7 8901234 5 6789012 3 4567890 1 2345678 9 0123456 7 8901234 5 6789012 3
	// -----------------------------------------------------------------------------
	// 0000000 0 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1
	// premable  xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o

	// 64    70            80          90          100         110           120
	// |     |             |           |           |           |             |
	// 4567890 1 2345678 9 0123456 7 8901234 5 6789012 3 4567890 1 2345678 9 0123456 7
	// -----------------------------------------------------------------------------
	// 0000000 1 0000000 1 0000000 1 0110111 0 0011000 1 0000001 0 0001100 1 1001010 0
	// xxxxxxx o xxxxxxx o xxxxxxx o xswffff o ffffccc o ccccccc o ccccccw o ppppppp o
	//                                  |---115---||---------71---------|
	// s = format start bit, o = odd parity of last 7 bits
	// f = facility code, c = card number
	// w = wiegand parity, x = extra space for other formats
	// p = CRC8maxim checksum
	// (26 bit format shown)

	//get bytes for checksum calc
	uint8_t checksum = bytebits_to_byte(bits + idx + 120, 8);
	uint8_t csBuff[14] = {0x00};
	for (uint8_t i = 0; i < 13; i++){
		csBuff[i] = bytebits_to_byte(bits + idx + 16 + (i*8), 8);
	}
	//check checksum calc
	//checksum calc thanks to ICEMAN!!
	uint32_t checkCS =  CRC8Maxim(csBuff, 13);

	//get raw ID before removing parities
	uint32_t rawLo = bytebits_to_byte(bits+idx+96, 32);
	uint32_t rawHi = bytebits_to_byte(bits+idx+64, 32);
	uint32_t rawHi2 = bytebits_to_byte(bits+idx+32, 32);
	uint32_t rawHi3 = bytebits_to_byte(bits+idx, 32);

	size = removeParity(bits, idx+8, 8, 1, 120);
	if (size != 105){
		if (g_debugMode) {
			if ( size == 0)
				PrintAndLog("DEBUG: Error - Pyramid: parity check failed - IDX: %d, hi3: %08X", idx, rawHi3);
			else
				PrintAndLog("DEBUG: Error - Pyramid: at parity check - tag size does not match Pyramid format, SIZE: %d, IDX: %d, hi3: %08X", size, idx, rawHi3);
		}
		return 0;
	}

	// ok valid card found!

	// Index map
	// 0         10        20        30        40        50        60        70
	// |         |         |         |         |         |         |         |
	// 01234567890123456789012345678901234567890123456789012345678901234567890
	// -----------------------------------------------------------------------
	// 00000000000000000000000000000000000000000000000000000000000000000000000
	// xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

	// 71         80         90          100
	// |          |          |           |
	// 1 2 34567890 1234567890123456 7 8901234
	// ---------------------------------------
	// 1 1 01110011 0000000001000110 0 1001010
	// s w ffffffff cccccccccccccccc w ppppppp
	//     |--115-| |------71------|
	// s = format start bit, o = odd parity of last 7 bits
	// f = facility code, c = card number
	// w = wiegand parity, x = extra space for other formats
	// p = CRC8-Maxim checksum
	// (26 bit format shown)

	//find start bit to get fmtLen
	int j;
	for (j=0; j < size; ++j){
		if(bits[j]) break;
	}
	
	uint8_t fmtLen = size-j-8;
	uint32_t fc = 0;
	uint32_t cardnum = 0;
	uint32_t code1 = 0;
	
	if ( fmtLen == 26 ){
		fc = bytebits_to_byte(bits+73, 8);
		cardnum = bytebits_to_byte(bits+81, 16);
		code1 = bytebits_to_byte(bits+72,fmtLen);
		PrintAndLog("Pyramid ID Found - BitLength: %d, FC: %d, Card: %d - Wiegand: %x, Raw: %08x%08x%08x%08x", fmtLen, fc, cardnum, code1, rawHi3, rawHi2, rawHi, rawLo);
	} else if (fmtLen == 45) {
		fmtLen = 42; //end = 10 bits not 7 like 26 bit fmt
		fc = bytebits_to_byte(bits+53, 10);
		cardnum = bytebits_to_byte(bits+63, 32);
		PrintAndLog("Pyramid ID Found - BitLength: %d, FC: %d, Card: %d - Raw: %08x%08x%08x%08x", fmtLen, fc, cardnum, rawHi3, rawHi2, rawHi, rawLo);
	} else {
		cardnum = bytebits_to_byte(bits+81, 16);
		if (fmtLen>32){
			//code1 = bytebits_to_byte(bits+(size-fmtLen),fmtLen-32);
			//code2 = bytebits_to_byte(bits+(size-32),32);
		PrintAndLog("Pyramid ID Found - BitLength: %d -unknown BitLength- (%d), Raw: %08x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo);
		} else{
			//code1 = bytebits_to_byte(bits+(size-fmtLen),fmtLen);
			PrintAndLog("Pyramid ID Found - BitLength: %d -unknown BitLength- (%d), Raw: %08x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo);
		}
	}
	if (checksum == checkCS)
		PrintAndLog("Checksum %02x passed", checksum);
	else
		PrintAndLog("Checksum %02x failed - should have been %02x", checksum, checkCS);

	if (g_debugMode){
		PrintAndLog("DEBUG: Pyramid: idx: %d, Len: %d, Printing Demod Buffer:", idx, 128);
		printDemodBuff();
	}
	return 1;
}

int CmdPyramidRead(const char *Cmd) {
	lf_read(true, 15000);
	return CmdPyramidDemod(Cmd);
}

int CmdPyramidClone(const char *Cmd) {

	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_pyramid_clone();

	uint32_t facilitycode=0, cardnumber=0, fc = 0, cn = 0;
	uint32_t blocks[5];
	uint8_t bs[128];
	memset(bs, 0x00, sizeof(bs));

	if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_pyramid_clone();

	facilitycode = (fc & 0x000000FF);
	cardnumber = (cn & 0x0000FFFF);
	
	if ( !GetPyramidBits(facilitycode, cardnumber, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}	

	//Pyramid - compat mode, FSK2a, data rate 50, 4 data blocks
	blocks[0] = T55x7_MODULATION_FSK2a | T55x7_BITRATE_RF_50 | 4 << T55x7_MAXBLOCK_SHIFT;

	// Q5
	if (param_getchar(Cmd, 2) == 'Q' || param_getchar(Cmd, 2) == 'q')
		blocks[0] = T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | T5555_SET_BITRATE(50) | 4 << T5555_MAXBLOCK_SHIFT;

	blocks[1] = bytebits_to_byte(bs, 32);
	blocks[2] = bytebits_to_byte(bs + 32, 32);
	blocks[3] = bytebits_to_byte(bs + 64, 32);
	blocks[4] = bytebits_to_byte(bs + 96, 32);

	PrintAndLog("Preparing to clone Farpointe/Pyramid to T55x7 with Facility Code: %u, Card Number: %u", facilitycode, cardnumber);
	print_blocks(blocks, 5);

	UsbCommand resp;
	UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};

	for (uint8_t i = 0; i < 5; ++i ) {
		c.arg[0] = blocks[i];
		c.arg[1] = i;
		clearCommandBuffer();
		SendCommand(&c);
		if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
			PrintAndLog("Error occurred, device did not respond during write operation.");
			return -1;
		}
	}
    return 0;
}

int CmdPyramidSim(const char *Cmd) {

	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_pyramid_sim();

	uint32_t facilitycode = 0, cardnumber = 0, fc = 0, cn = 0;
	
	uint8_t bs[128];
	size_t size = sizeof(bs);
	memset(bs, 0x00, size);
	
	// Pyramid uses:  fcHigh: 10, fcLow: 8, clk: 50, invert: 0
	uint8_t clk = 50, invert = 0, high = 10, low = 8;
	uint16_t arg1, arg2;	
	arg1 = high << 8 | low;
	arg2 = invert << 8 | clk;
	
	if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_pyramid_sim();

	facilitycode = (fc & 0x000000FF);
	cardnumber = (cn & 0x0000FFFF);
	
	if ( !GetPyramidBits(facilitycode, cardnumber, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}	

	PrintAndLog("Simulating Farpointe/Pyramid - Facility Code: %u, CardNumber: %u", facilitycode, cardnumber );
	
	UsbCommand c = {CMD_FSK_SIM_TAG, {arg1, arg2, size}};
	memcpy(c.d.asBytes, bs, size);
	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}

static command_t CommandTable[] = {
    {"help",	CmdHelp,		1, "this help"},
	{"demod",	CmdPyramidDemod,0, "demodulate a Pyramid FSK tag from the GraphBuffer"},
	{"read",	CmdPyramidRead,	0, "attempt to read and extract tag data"},
	{"clone",	CmdPyramidClone,0, "clone pyramid tag"},
	{"sim",		CmdPyramidSim,	0, "simulate pyramid tag"},
    {NULL, NULL, 0, NULL}
};

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

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