/* medical.c - Handles 1 track and 2 track pharmacode and Codabar */

/*
    libzint - the open source barcode library
    Copyright (C) 2008 Robin Stuart <robin@zint.org.uk>
*/

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

extern int c39(struct zint_symbol *symbol, unsigned char source[], int length);
/* Codabar table checked against EN 798:1995 */

#define CALCIUM	"0123456789-$:/.+ABCD"

static const char *CodaTable[20] = {"11111221", "11112211", "11121121", "22111111", "11211211", "21111211",
	"12111121", "12112111", "12211111", "21121111", "11122111", "11221111", "21112121", "21211121",
	"21212111", "11212121", "11221211", "12121121", "11121221", "11122211"};

int pharma_one(struct zint_symbol *symbol, unsigned char source[], int length)
{
	/* "Pharmacode can represent only a single integer from 3 to 131070. Unlike other
	   commonly used one-dimensional barcode schemes, pharmacode does not store the data in a
	   form corresponding to the human-readable digits; the number is encoded in binary, rather
	   than decimal. Pharmacode is read from right to left: with n as the bar position starting
	   at 0 on the right, each narrow bar adds 2n to the value and each wide bar adds 2(2^n).
	   The minimum barcode is 2 bars and the maximum 16, so the smallest number that could
	   be encoded is 3 (2 narrow bars) and the biggest is 131070 (16 wide bars)."
	   - http://en.wikipedia.org/wiki/Pharmacode */

	/* This code uses the One Track Pharamacode calculating algorithm as recommended by
	   the specification at http://www.laetus.com/laetus.php?request=file&id=69 */

	unsigned long int tester;
	int counter, error_number, h;
	char inter[18] = { 0 }; /* 131070 -> 17 bits */
	char dest[64]; /* 17 * 2 + 1 */

	error_number = 0;

	if(length > 6) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(NEON, source, length);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}

	tester = atoi((char*)source);

	if((tester < 3) || (tester > 131070)) {
		strcpy(symbol->errtxt, "Data out of range");
		return ERROR_INVALID_DATA;
	}

	do
	{
		if(!(tester & 1)) {
			concat(inter, "W");
			tester = (tester - 2) / 2;
		} else {
			concat(inter, "N");
			tester = (tester - 1) / 2;
		}
	}
	while(tester != 0);

	h = strlen(inter) - 1;
	*dest = '\0';
	for(counter = h; counter >= 0; counter--) {
		if(inter[counter] == 'W') {
			concat(dest, "32");
		} else {
			concat(dest, "12");
		}
	}

	expand(symbol, dest);

	return error_number;
}

int pharma_two_calc(struct zint_symbol *symbol, unsigned char source[], char dest[])
{
	/* This code uses the Two Track Pharamacode defined in the document at
	   http://www.laetus.com/laetus.php?request=file&id=69 and using a modified
	   algorithm from the One Track system. This standard accepts integet values
	   from 4 to 64570080. */

	unsigned long int tester;
	int counter, h;
	char inter[17];
	int error_number;

	tester = atoi((char*)source);

	if((tester < 4) || (tester > 64570080))
	{
		strcpy(symbol->errtxt, "Data out of range");
		return ERROR_INVALID_DATA;
	}
	error_number = 0;
	strcpy(inter, "");
	do
	{
		switch(tester%3) {
			case 0:
			concat(inter, "3");
			tester = (tester - 3) / 3;
			break;
			case 1:
			concat(inter, "1");
			tester = (tester - 1) / 3;
			break;
			case 2:
			concat(inter, "2");
			tester = (tester - 2) / 3;
			break;
		}
	}
	while(tester != 0);

	h = strlen(inter) - 1;
	for(counter = h; counter >= 0; counter--)
	{
		dest[h - counter] = inter[counter];
	}
	dest[h + 1] = '\0';

	return error_number;
}

int pharma_two(struct zint_symbol *symbol, unsigned char source[], int length)
{
	/* Draws the patterns for two track pharmacode */
	char height_pattern[200];
	unsigned int loopey, h;
	int writer;
	int error_number = 0;
	strcpy(height_pattern, "");

	if(length > 8) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(NEON, source, length);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}
	error_number = pharma_two_calc(symbol, source, height_pattern);
	if(error_number != 0) {
		return error_number;
	}

	writer = 0;
	h = strlen(height_pattern);
	for(loopey = 0; loopey < h; loopey++)
	{
		if((height_pattern[loopey] == '2') || (height_pattern[loopey] == '3'))
		{
			set_module(symbol, 0, writer);
		}
		if((height_pattern[loopey] == '1') || (height_pattern[loopey] == '3'))
		{
			set_module(symbol, 1, writer);
		}
		writer += 2;
	}
	symbol->rows = 2;
	symbol->width = writer - 1;


	return error_number;
}

int codabar(struct zint_symbol *symbol, unsigned char source[], int length)
{ /* The Codabar system consisting of simple substitution */

	int i, error_number;
	char dest[512];

	error_number = 0;
	strcpy(dest, "");

	if(length > 60) { /* No stack smashing please */
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	to_upper(source);
	error_number = is_sane(CALCIUM, source, length);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}
	/* Codabar must begin and end with the characters A, B, C or D */
	if((source[0] != 'A') && (source[0] != 'B') && (source[0] != 'C') && (source[0] != 'D'))
	{
		strcpy(symbol->errtxt, "Invalid characters in data");
		return ERROR_INVALID_DATA;
	}

	if((source[length - 1] != 'A') && (source[length - 1] != 'B') &&
		    (source[length - 1] != 'C') && (source[length - 1] != 'D'))
	{
		strcpy(symbol->errtxt, "Invalid characters in data");
		return ERROR_INVALID_DATA;
	}

	for(i = 0; i < length; i++)
	{
		lookup(CALCIUM, CodaTable, source[i], dest);
	}

	expand(symbol, dest);
	ustrcpy(symbol->text, source);
	return error_number;
}

int code32(struct zint_symbol *symbol, unsigned char source[], int length)
{ /* Italian Pharmacode */
	int i, zeroes, error_number, checksum, checkpart, checkdigit;
	char localstr[10], risultante[7];
	long int pharmacode, remainder, devisor;
	int codeword[6];
	char tabella[34];

	/* Validate the input */
	if(length > 8) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(NEON, source, length);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}

	/* Add leading zeros as required */
	zeroes = 8 - length;
	memset(localstr, '0', zeroes);
	strcpy(localstr + zeroes, (char*)source);

	/* Calculate the check digit */
	checksum = 0;
	checkpart = 0;
	for(i = 0; i < 4; i++) {
		checkpart = ctoi(localstr[i * 2]);
		checksum += checkpart;
		checkpart = 2 * (ctoi(localstr[(i * 2) + 1]));
		if(checkpart >= 10) {
			checksum += (checkpart - 10) + 1;
		} else {
			checksum += checkpart;
		}
	}

	/* Add check digit to data string */
	checkdigit = checksum % 10;
	localstr[8] = itoc(checkdigit);
	localstr[9] = '\0';

	/* Convert string into an integer value */
	pharmacode = atoi(localstr);

	/* Convert from decimal to base-32 */
	devisor = 33554432;
	for(i = 5; i >= 0; i--) {
		codeword[i] = pharmacode / devisor;
		remainder = pharmacode % devisor;
		pharmacode = remainder;
		devisor /= 32;
	}

	/* Look up values in 'Tabella di conversione' */
	strcpy(tabella, "0123456789BCDFGHJKLMNPQRSTUVWXYZ");
	for(i = 5; i >= 0; i--) {
		risultante[5 - i] = tabella[codeword[i]];
	}
	risultante[6] = '\0';
	/* Plot the barcode using Code 39 */
	error_number = c39(symbol, (unsigned char*)risultante, strlen(risultante));
	if(error_number != 0) { return error_number; }

	/* Override the normal text output with the Pharmacode number */
	ustrcpy(symbol->text, (unsigned char*)"A");
	uconcat(symbol->text, (unsigned char*)localstr);

	return error_number;
}