//-----------------------------------------------------------------------------
//
// 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 NEDAP tag commands
//-----------------------------------------------------------------------------
#include <string.h>
#include <inttypes.h>
#include "cmdlfnedap.h"
static int CmdHelp(const char *Cmd);

int usage_lf_nedap_clone(void){
	PrintAndLog("clone a NEDAP tag to a T55x7 tag.");
	PrintAndLog("");
	PrintAndLog("Usage: lf nedap clone <Card-Number>");
	PrintAndLog("Options :");
	PrintAndLog("  <Card Number>   : 24-bit value card number");
//	PrintAndLog("  Q5              : optional - clone to Q5 (T5555) instead of T55x7 chip");
	PrintAndLog("");
	PrintAndLog("Sample  : lf nedap clone 112233");
	return 0;
}

int usage_lf_nedap_sim(void) {
	PrintAndLog("Enables simulation of NEDAP card with specified card number.");
	PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
	PrintAndLog("");
	PrintAndLog("Usage:  lf nedap sim <Card-Number>");
	PrintAndLog("Options :");
	PrintAndLog("  <Card Number>   : 24-bit value card number");
	PrintAndLog("");
	PrintAndLog("Sample  : lf nedap sim 112233");
	return 0;
}

int GetNedapBits(uint32_t cn, uint8_t *nedapBits) {

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

	// preamble  1111 1111 10 = 0XF8
	num_to_bytebits(0xF8, 10, pre);

	// fixed tagtype code?  0010 1101 = 0x2D
	num_to_bytebits(0x2D, 8, pre+10);
	
	// 46 encrypted bits - UNKNOWN ALGO
	//    -- 16 bits checksum. Should be 4x4 checksum,  based on UID and 2 constant values.
	//    -- 30 bits undocumented?  
	num_to_bytebits(cn, 46, pre+18);

	//----from this part, the UID in clear text, with a 1bit ZERO as separator between bytes.
	pre[64] = 0;

	// cardnumber
	num_to_bytebits(cn, 24, pre+64);

	pre[73] = 0;
	pre[82] = 0;
	pre[91] = 0;
	pre[100] = 0;
	pre[109] = 0;
	pre[118] = 0;
	
	// add paritybits	(bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
	addParity(pre+64, pre+64, 128, 8, 1);
//1111111110001011010000010110100011001001000010110101001101011001000110011010010000000000100001110001001000000001000101011100111
	return 1;
}

//NEDAP demod - ASK/Biphase,  RF/64 with preamble of 1111111110  (always a 128 bit data stream)
//print NEDAP Prox ID, encoding, encrypted ID, 
int CmdFSKdemodNedap(const char *Cmd) {
	//raw ask demod no start bit finding just get binary from wave
	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
	size_t size = getFromGraphBuf(BitStream);
	if (size==0) return 0;

	//get binary from ask wave
	if (!ASKbiphaseDemod("0 64 1 0", FALSE)) {
		if (g_debugMode) PrintAndLog("Error NEDAP: ASKbiphaseDemod failed");
		return 0;
	}
	size_t size = DemodBufferLen;

	int idx = NedapDemod(BitStream, &size);
	if (idx < 0){
		if (g_debugMode){
			if (idx == -5)
				PrintAndLog("DEBUG: Error - not enough samples");
			else if (idx == -1)
				PrintAndLog("DEBUG: Error - only noise found");
			else if (idx == -2)
				PrintAndLog("DEBUG: Error - problem during ASK/Biphase demod");
			else if (idx == -3)
				PrintAndLog("DEBUG: Error - Size not correct: %d", size);
			else if (idx == -4)
				PrintAndLog("DEBUG: Error - NEDAP preamble not found");
			else
				PrintAndLog("DEBUG: Error - idx: %d",idx);
		}
		return 0;
	}

/* Index map
0        10        20          30            40          50        64
|        |         |           |             |           |         |
 preamble    enc tag type         encrypted uid                    d    33    d    90    p    04    d    71    d    40    d    45    d    E7    P
1111111110 00101101000001011 0100011001001000010110101001101011001 0 00110011 0 10010000 0 00000100 0 01110001 0 01000000 0 01000101 0 11100111 1
                                                                       uid2       uid1       uid0         I          I          R           R    
	 Tag ID is 049033 
	 I = Identical on all tags
	 R = Random ?
	 UID2, UID1, UID0 == card number
*/

	//get raw ID before removing parities
	uint32_t rawLo = bytebits_to_byte(BitStream+idx+96,32);
	uint32_t rawHi = bytebits_to_byte(BitStream+idx+64,32);
	uint32_t rawHi2 = bytebits_to_byte(BitStream+idx+32,32);
	uint32_t rawHi3 = bytebits_to_byte(BitStream+idx,32);
	setDemodBuf(BitStream,128,idx);

	// ok valid card found!
	uint32_t cardnum = bytebits_to_byte(BitStream+81, 16);
	PrintAndLog("NEDAP ID Found - Card: %d - Raw: %08x%08x%08x%08x", cardnum, rawHi3, rawHi2, rawHi, rawLo);
	
	if (g_debugMode){
		PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, 128);
		printDemodBuff();
	}
	return 1;
}


int CmdLFNedapRead(const char *Cmd) {
	CmdLFRead("s");
	getSamples("30000",false);
	return CmdFSKdemodNedap("");
}
/*
int CmdLFNedapClone(const char *Cmd) {

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

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

	if (sscanf(Cmd, "%u", &cn ) != 1) return usage_lf_nedap_clone();

	cardnumber = (cn & 0x00FFFFFF);
	
	if ( !GetNedapBits(cardnumber, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}	

	((ASK/biphase   data rawdemod ab 0 64 1 0
	//NEDAP - compat mode, ASK/Biphase, data rate 64, 4 data blocks
	blocks[0] = T55x7_MODULATION_BIPHASE | T55x7_BITRATE_RF_64 | 4<<T55x7_MAXBLOCK_SHIFT;

	if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
		blocks[0] = T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | 64<<T5555_BITRATE_SHIFT | 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 NEDAP to T55x7 with card number: %u", cardnumber);
	PrintAndLog("Blk | Data ");
	PrintAndLog("----+------------");
	for ( i = 0; i<5; ++i )
		PrintAndLog(" %02d | %08" PRIx32, i, blocks[i]);

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

	for ( i = 0; i<5; ++i ) {
		c.arg[0] = blocks[i];
		c.arg[1] = i;
		clearCommandBuffer();
		SendCommand(&c);
		if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
			PrintAndLog("Error occurred, device did not respond during write operation.");
			return -1;
		}
	}
    return 0;
}
*/

int CmdLFNedapSim(const char *Cmd) {

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

	uint32_t cardnumber = 0, cn = 0;
	
	uint8_t bs[128];
	size_t size = sizeof(bs);
	memset(bs, 0x00, size);
	
	// NEDAP,  Bihase = 2, clock 64, inverted, 
	uint8_t encoding = 2, separator = 0, clk=64, invert=1;
	uint16_t arg1, arg2;
	arg1 = clk << 8 | encoding;
	arg2 = invert << 8 | separator;

	if (sscanf(Cmd, "%u", &cn ) != 2) return usage_lf_nedap_sim();
	cardnumber = (cn & 0x00FFFFFF);
	
	if ( !GetNedapBits(cardnumber, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}	

	PrintAndLog("Simulating Nedap - CardNumber: %u", cardnumber );
	
	UsbCommand c = {CMD_ASK_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"},
	{"read",	CmdLFNedapRead,  0, "Attempt to read and extract tag data"},
//	{"clone",	CmdLFNedapClone, 0, "<Card Number>  clone nedap tag"},
	{"sim",		CmdLFNedapSim,   0, "<Card Number>  simulate nedap tag"},
    {NULL, NULL, 0, NULL}
};

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

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