STUPID SHIT

/**********************************************************************************************
This is to certify that this project is my own work,
based on my personal efforts in studying and applying the concepts learned.
I have constructed the functions and their respective algorithms and corresponding code by myself.
The program was run, tested, and debugged by my own efforts.  I further certify that I have not
copied in part or whole or otherwise plagiarized the work of other students and/or persons.

    												PINEDA, Lucia Corazon L., DLSU ID# 11610697
***********************************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_CART 100
typedef char string15[16];
typedef char string20[21];
typedef char string50[51];
typedef char string8[9];
typedef struct{
		string20 first,
				 middle,
				 last;
} nameType;
typedef struct{
		nameType name;
		string50 address;
}userInfoType;
typedef struct{
		string8 code;
		int qty;
}prodBoughtType;
typedef prodBoughtType arrBought[MAX_CART];
struct userTag{
		string15 username,
				 password;
		userInfoType info;
		char type;
		float creditlimit,
			  outstanding;
		arrBought cart;
		int nItems,
			isLocked;
		struct userTag *pNext;
};
typedef struct userTag userType;
typedef userType * ptrUser;
struct productListTag{
		string15 supplier,
				 product;
		int qtyAvailable;
		float purPrice,
			  unitSellPrice,
			  discRate;
		int qtySold;
		string8 prodCode;
};

struct stockTag{
		string15 category;
		struct productListTag prodList;
		struct stockTag *pNext;
};
typedef struct stockTag stockType;
typedef stockType * ptrStock;

///////FUNCTIONS:
/*function numDigits counts the number of digits of an integer
@param: Number - input integer
@return: digits - number of of digits of the integer
*/
int numDigits(int number){
	int digits=0;
	if(number<0)
		digits=1;
	while(number){
		number/=10;
		digits++;
	}

	return digits;
}

/*Function freeAll frees all the User structures of their data and gets rid of all dangling pointers.
@param: *pFirst - structure with data of current user
*/
void freeAll(ptrUser *pFirst){
	ptrUser pDel;
	while(*pFirst!=NULL){
		pDel=*pFirst;
		*pFirst=(*pFirst)->pNext;
		free(pDel);
	}
}

/*Function freeAllStocks Frees all the Stock structures of their data and gets rid of all dangling pointers.
@param: *pFirst - structure with data of current stock
*/

void freeAllStocks(ptrStock *pFirst){
	ptrStock pDel;
	while(*pFirst!=NULL){
		pDel=*pFirst;
		*pFirst=(*pFirst)->pNext;
		free(pDel);
	}
}

/*Function getUserInfo asks user to input their information, which consists of name and address
@param: *pInfo - structure of “User Information” within the bigger structure with data of current user
*/
void getUserInfo(userInfoType *pInfo){
	getchar();
	printf("[Name]\n");
	printf("First name: ");
	fgets(pInfo->name.first, 21, stdin);
	printf("Middle name: ");
	fgets(pInfo->name.middle, 21, stdin);
	printf("Last name: ");
	fgets(pInfo->name.last, 21, stdin);
	printf("Enter address: ");
	fgets(pInfo->address, 51, stdin);

	//Removes the '\n' because fgets takes the enter key and adds it to the string
	pInfo->address[strlen(pInfo->address)-1]='\0';
	pInfo->name.first[strlen(pInfo->name.first)-1]='\0';
	pInfo->name.middle[strlen(pInfo->name.middle)-1]='\0';
	pInfo->name.last[strlen(pInfo->name.last)-1]='\0';

}

/*Function manageAccounts Displays the Manage Account Menu’s options (view locked accounts,
unlock specific account, unlock all locked accounts, unlock all locked accounts, view accounts
with outstanding balance, and return to administrator menu) and lets the user choose an option.
@param: *pUser - structure that holds the information of the current user
*/

void viewLocked(userType *pCurrent){
	printf("\n[LOCKED ACCOUNTS]\n");
		while(pCurrent!=NULL){
			if(pCurrent->isLocked==1)
				printf("%s\n", pCurrent->username);
			pCurrent=pCurrent->pNext;
		}
}
void manageAccounts(userType *pUser){
	userType *pCurrent;
	int opt=0;
	char cDump;
	string15 username;

	do{
		printf("\n------Manage Accounts Menu------\n");
		printf("1 - View Locked Accounts\n");
		printf("2 - Unlock Specific Account\n");
		printf("3 - Unlock All Locked Accounts\n");
		printf("4 - View Accounts with Outstanding Balance\n");
		printf("5 - Return to Administrator Menu\n\n");

		printf("Choose option: ");
		scanf("%d", &opt);

		switch(opt){
			case 1: viewLocked(pUser);
					break;
			case 2: viewLocked(pUser);
					printf("Input username of account to unlock: ");
					scanf("%s%c", username, &cDump);

					pCurrent=pUser;

					while(pCurrent!=NULL){
						if(pCurrent->isLocked==1 && strcmp(pCurrent->username, username)==0)
							pCurrent->isLocked=0;
						pCurrent=pCurrent->pNext;
					}

					printf("The account of %s has been unlocked.\n", username);
					break;
			case 3: viewLocked(pUser);

					pCurrent=pUser;

					while(pCurrent!=NULL){
						if(pCurrent->isLocked==1)
							pCurrent->isLocked=0;
						pCurrent=pCurrent->pNext;
					}

					printf("All locked accounts have been unlocked.\n");
					break;
			case 4: pCurrent=pUser;
					printf("\n[ACCOUNTS WITH OUTSTANDING BALANCE]\n");
					while(pCurrent!=NULL){
						if((pCurrent->type=='s' || pCurrent->type=='S') && pCurrent->outstanding>0.00){
							printf("username: %s\n", pCurrent->username);
							printf("full name: %s %s %s\n", pCurrent->info.name.first, pCurrent->info.name.middle, pCurrent->info.name.last);
							printf("Outstanding Balance: P %.2f\n", pCurrent->outstanding);
						}
						pCurrent=pCurrent->pNext;
					}
					break;
			case 5:	break;
		}
		printf("\n");
	}while(opt!=5);
}

/*Function checkStock checks if the input code was already used in a previous stock.
@param: category - input category
		*pStock - structure that holds all the stock information
*/
int checkStock(string15 category, stockType *pStock){
	int check=1;
	stockType *pOrig = pStock;

	while(pOrig!=NULL)
	{
		if(strcmp(category, pOrig->category)==0)
		{
			check=0;
			pOrig=NULL;
		}
		else
			pOrig=pOrig->pNext;
	}

	return check;
}

int checkProd(string15 product, stockType *pStock){
	int check=1;
	stockType *pOrig = pStock;

	while(pOrig!=NULL)
	{
		if(strcmp(product, pOrig->prodList.product)==0)
		{
			check=0;
			pOrig=NULL;
		}
		else
			pOrig=pOrig->pNext;
	}

	return check;
}


void displayAllStocks(ptrStock pStocks){
	while(pStocks!=NULL){
		printf("\n%s\n", pStocks->category);

		pStocks=pStocks->pNext;
	}
}

/*Function addNewStock will add a new stock to the current list of stocks by asking stock information
@param: *pStock - structure with information of current stock
		*pOriginal - structure with information of all stocks*/
 void addNewStock(stockType *pStock, stockType *pOriginal, int *categoryCtr){
	stockType *pCurrent=NULL,
			  *pNew;
	string15 category,
			 supplier,
			 product;
	int unique=0,
		unique1=0,
		unique2=0,
		i=0,
		newStock=0,
		randomNum=0,
		uniqueProd=0;
	char cDump;

	getchar();

	printf("[ADD NEW STOCK]\n");

	do{
		do{
			printf("Enter category: ");
			scanf("%s%c", &category, &cDump);
		}while(strlen(category)<3 || strlen(category)>15);

		if(strlen(category)>=3 && strlen(category)<=15){

			pCurrent=pOriginal;

			unique=checkStock(category, pOriginal);

			if(unique==1)
			{	//NEW CATEGORY!!!
				(*categoryCtr)++;
				printf("\nNew Category! Category number %d\n", *categoryCtr);
			}
			if(unique!=1)   //NOT A NEW CATEGORY
				printf("Category already exists.\n");

				strcpy(pStock->category, category);

				printf("[Product List]\n");

				do{
					do{
						printf("Enter supplier: ");
						fgets(supplier, 16, stdin);
						supplier[strlen(supplier)-1]='\0';
					}while(strlen(supplier)>15);

					do{
						printf("Enter product: ");
						fgets(product, 16, stdin);
						product[strlen(product)-1]='\0';
					}while(strlen(product)>15);

					if(strlen(product)<=15){

						uniqueProd=checkProd(product, pOriginal);

						if(uniqueProd==1)
						{
							strcpy(pStock->prodList.supplier, supplier);
							strcpy(pStock->prodList.product, product);
						}
						if(uniqueProd!=1)
						{
							printf("Product already exists.\n");
						}
					}
				}while(uniqueProd!=1);

				uniqueProd=0;

					printf("Enter quantity available: ");
					scanf("%d", &pStock->prodList.qtyAvailable);
					printf("Enter purchase price: ");
					scanf("%f", &pStock->prodList.purPrice);
					printf("Enter unit selling price: ");
					scanf("%f", &pStock->prodList.unitSellPrice);
					printf("Enter discount rate: ");
					scanf("%f", &pStock->prodList.discRate);

					pStock->prodList.qtySold=0;

					pStock->prodList.prodCode[0]=category[0];
					pStock->prodList.prodCode[1]=supplier[0];
					pStock->prodList.prodCode[2]=product[0];

					i=1;

					while(i<=5){
						randomNum = rand()%58;
						if(randomNum>47 && randomNum<58){
							pStock->prodList.prodCode[(i+2)]=randomNum;
							i++;
						}
					}

					pStock->prodList.prodCode[8]='\0';

					printf("CHEEEECK\n");
		}
	}while(strlen(category)<3 || strlen(category)>15);

	printf("CHECKING OUTSIDE DA LOOOOP\n");
}

/*Function viewStocks displays all the stock information for the administrator, and the products for the shoppers
@param: *pStocks - structure that holds all the stock information
		opt- number that shows if the user is a shopper or administrator
*/
void viewStocks(ptrStock pStocks, int opt){
	int i=0,
		page=1,
		length,
		stockNum;
	string15 categoryInput;
	char nextPage;
	stockType *pCurrent;
	string15 space="               ",
			 space2="               ",
			 space3="               ";
	char space4[10]="         ";
	char space5[5]="    ";
	char space6[9]="        ";
	char space7[8]="       ";

	stockNum=stockCount(pStocks);

	if(opt==1){
	printf("\n[VIEW STOCKS]\n");

	printf("Category       Supplier       Product  Product        Qty       Qty  Purchase Selling Discount\n");
	printf("                              Code                    Available Sold Price    Price   Rate\n");

	pCurrent=pStocks;
	i=1;

	pCurrent->prodList.supplier[strlen(pCurrent->prodList.supplier)-1]='\0';
	pCurrent->prodList.product[strlen(pCurrent->prodList.product)-1]='\0';

	while(i<20 && pCurrent!=NULL){

		printf("%s", pCurrent->category);
		space[(15-strlen(pCurrent->category))]='\0';
		printf("%s", space);

		printf("%s", pCurrent->prodList.supplier);
		space2[(15-strlen(pCurrent->prodList.supplier))]='\0';
		printf("%s", space2);

		printf("%s ", pCurrent->prodList.prodCode);

		printf("%s", pCurrent->prodList.product);
		space3[(15-strlen(pCurrent->prodList.product))]='\0';
		printf("%s", space3);

		printf("%d", pCurrent->prodList.qtyAvailable);
		space4[(9-numDigits(pCurrent->prodList.qtyAvailable))]='\0';
		printf("%s ", space4);

		printf("%d", pCurrent->prodList.qtySold);
		space5[(4-numDigits(pCurrent->prodList.qtySold))]='\0';
		printf("%s", space5);

		printf("%.2f", pCurrent->prodList.purPrice);
		space6[(6-numDigits(pCurrent->prodList.purPrice))]='\0';
		printf("%s", space6);

		printf("%.2f", pCurrent->prodList.unitSellPrice);
		space7[(5-numDigits(pCurrent->prodList.unitSellPrice))]='\0';
		printf("%s", space7);

		printf("%.1f\n\n", pCurrent->prodList.discRate);

		i++;
		pCurrent=pCurrent->pNext;
	}

	 printf("\n\npage %d of %d \n\n", page, stockNum);
	 page++;
	 scanf("%c", &nextPage);
	}

	if(opt==2){

	printf("Enter a category: ");
	scanf("%s", categoryInput);

	printf("\n[VIEW STOCKS BY CATEGORY]\n");

	printf("Category       Supplier       Product  Product        Qty       Qty  Purchase Selling Discount\n");
	printf("                              Code                    Available Sold Price    Price   Rate\n");

	pCurrent=pStocks;
	i=1;

	pCurrent->prodList.supplier[strlen(pCurrent->prodList.supplier)-1]='\0';
	pCurrent->prodList.product[strlen(pCurrent->prodList.product)-1]='\0';

	while(i<20 && pCurrent!=NULL){

		if(strcmp(categoryInput, pCurrent->category)==0){
			printf("%s", pCurrent->category);
			space[(15-strlen(pCurrent->category))]='\0';
			printf("%s", space);

			printf("%s", pCurrent->prodList.supplier);
			space2[(15-strlen(pCurrent->prodList.supplier))]='\0';
			printf("%s", space2);

			printf("%s ", pCurrent->prodList.prodCode);

			printf("%s", pCurrent->prodList.product);
			space3[(15-strlen(pCurrent->prodList.product))]='\0';
			printf("%s", space3);

			printf("%d", pCurrent->prodList.qtyAvailable);
			space4[(9-numDigits(pCurrent->prodList.qtyAvailable))]='\0';
			printf("%s ", space4);

			printf("%d", pCurrent->prodList.qtySold);
			space5[(4-numDigits(pCurrent->prodList.qtySold))]='\0';
			printf("%s", space5);

			printf("%.2f", pCurrent->prodList.purPrice);
			space6[(6-numDigits(pCurrent->prodList.purPrice))]='\0';
			printf("%s", space6);

			printf("%.2f", pCurrent->prodList.unitSellPrice);
			space7[(5-numDigits(pCurrent->prodList.unitSellPrice))]='\0';
			printf("%s", space7);

			printf("%.1f\n\n", pCurrent->prodList.discRate);

			i++;
			}
			pCurrent=pCurrent->pNext;
		}

		 printf("\n\npage %d of %d \n\n", page, stockNum);
		 page++;
		 scanf("%c", &nextPage);
	}

	if(opt==3){

	printf("Enter a category: ");
	scanf("%s", categoryInput);

	printf("\n[VIEW STOCKS TO REORDER]\n");

	printf("Category       Supplier       Product  Product        Qty       Qty  Purchase Selling Discount\n");
	printf("                              Code                    Available Sold Price    Price   Rate\n");

	pCurrent=pStocks;
	i=1;

	pCurrent->prodList.supplier[strlen(pCurrent->prodList.supplier)-1]='\0';
	pCurrent->prodList.product[strlen(pCurrent->prodList.product)-1]='\0';

	while(i<20 && pCurrent!=NULL){

		if(pCurrent->prodList.qtyAvailable<=5){
			printf("%s", pCurrent->category);
			space[(15-strlen(pCurrent->category))]='\0';
			printf("%s", space);

			printf("%s", pCurrent->prodList.supplier);
			space2[(15-strlen(pCurrent->prodList.supplier))]='\0';
			printf("%s", space2);

			printf("%s ", pCurrent->prodList.prodCode);

			printf("%s", pCurrent->prodList.product);
			space3[(15-strlen(pCurrent->prodList.product))]='\0';
			printf("%s", space3);

			printf("%d", pCurrent->prodList.qtyAvailable);
			space4[(9-numDigits(pCurrent->prodList.qtyAvailable))]='\0';
			printf("%s ", space4);

			printf("%d", pCurrent->prodList.qtySold);
			space5[(4-numDigits(pCurrent->prodList.qtySold))]='\0';
			printf("%s", space5);

			printf("%.2f", pCurrent->prodList.purPrice);
			space6[(6-numDigits(pCurrent->prodList.purPrice))]='\0';
			printf("%s", space6);

			printf("%.2f", pCurrent->prodList.unitSellPrice);
			space7[(5-numDigits(pCurrent->prodList.unitSellPrice))]='\0';
			printf("%s", space7);

			printf("%.1f\n\n", pCurrent->prodList.discRate);

			i++;
			}
			pCurrent=pCurrent->pNext;
		}

		 printf("\n\npage %d of %d \n\n", page, stockNum);
		 page++;
		 scanf("%c", &nextPage);
	}

	if(opt==4){
		printf("\n[BROWSE ALL PRODUCTS]\n");

		printf("Category       Brand         Product  Product        Qty       Qty  Purchase Unit   Discount\n");
		printf("                             Code                    Available Sold Price            Rate\n");

		pCurrent=pStocks;
		i=1;

		pCurrent->prodList.supplier[strlen(pCurrent->prodList.supplier)-1]='\0';
		pCurrent->prodList.product[strlen(pCurrent->prodList.product)-1]='\0';


		while(i<20 && pCurrent!=NULL){
			if(pCurrent->prodList.qtyAvailable>0){
				printf("%s", pCurrent->category);
				space[(15-strlen(pCurrent->category))]='\0';
				printf("%s", space);

				printf("%s", pCurrent->prodList.supplier);
				space2[(15-strlen(pCurrent->prodList.supplier))]='\0';
				printf("%s", space2);

				printf("%s ", pCurrent->prodList.prodCode);

				printf("%s", pCurrent->prodList.product);
				space3[(15-strlen(pCurrent->prodList.product))]='\0';
				printf("%s", space3);

				printf("%d", pCurrent->prodList.qtyAvailable);
				space4[(9-numDigits(pCurrent->prodList.qtyAvailable))]='\0';
				printf("%s ", space4);

				printf("%d", pCurrent->prodList.qtySold);
				space5[(4-numDigits(pCurrent->prodList.qtySold))]='\0';
				printf("%s", space5);

				printf("%.2f", pCurrent->prodList.purPrice);
				space6[(6-numDigits(pCurrent->prodList.purPrice))]='\0';
				printf("%s", space6);

				printf("%.2f", pCurrent->prodList.unitSellPrice);
				space7[(5-numDigits(pCurrent->prodList.unitSellPrice))]='\0';
				printf("%s", space7);

				printf("%.1f\n\n", pCurrent->prodList.discRate);

				i++;
			}
			pCurrent=pCurrent->pNext;
	}

	 printf("\n\n page %d of %d \n\n", page, stockNum);
	 page++;
	 scanf("%c", &nextPage);

	}

	if(opt==5){
		printf("\n[BROWSE PRODUCTS BY CATEGORIES]\n");

		printf("Category       Brand         Product  Product        Qty       Qty  Purchase Unit   Discount\n");
		printf("                             Code                    Available Sold Price            Rate\n");

		pCurrent=pStocks;
		i=1;

		pCurrent->prodList.supplier[strlen(pCurrent->prodList.supplier)-1]='\0';
		pCurrent->prodList.product[strlen(pCurrent->prodList.product)-1]='\0';

		printf("Enter category: ");
		scanf("%s", categoryInput);

		while(i<20 && pCurrent!=NULL){
			if(pCurrent->prodList.qtyAvailable>0 && strcmp(categoryInput, pCurrent->category)==0){
				printf("%s", pCurrent->category);
				space[(15-strlen(pCurrent->category))]='\0';
				printf("%s", space);

				printf("%s", pCurrent->prodList.supplier);
				space2[(15-strlen(pCurrent->prodList.supplier))]='\0';
				printf("%s", space2);

				printf("%s ", pCurrent->prodList.prodCode);

				printf("%s", pCurrent->prodList.product);
				space3[(15-strlen(pCurrent->prodList.product))]='\0';
				printf("%s", space3);

				printf("%d", pCurrent->prodList.qtyAvailable);
				space4[(9-numDigits(pCurrent->prodList.qtyAvailable))]='\0';
				printf("%s ", space4);

				printf("%d", pCurrent->prodList.qtySold);
				space5[(4-numDigits(pCurrent->prodList.qtySold))]='\0';
				printf("%s", space5);

				printf("%.2f", pCurrent->prodList.purPrice);
				space6[(6-numDigits(pCurrent->prodList.purPrice))]='\0';
				printf("%s", space6);

				printf("%.2f", pCurrent->prodList.unitSellPrice);
				space7[(5-numDigits(pCurrent->prodList.unitSellPrice))]='\0';
				printf("%s", space7);

				printf("%.1f\n\n", pCurrent->prodList.discRate);

				i++;
			}
			pCurrent=pCurrent->pNext;
		}

		 printf("\n\n page %d of %d \n\n", page, stockNum);
		 page++;
		 scanf("%c", &nextPage);

	}

	if(opt==6){
		printf("\n[BROWSE PRODUCTS ON SALE]\n");

		printf("Category       Brand         Product  Product        Qty       Qty  Purchase Unit   Discount\n");
		printf("                             Code                    Available Sold Price            Rate\n");

		pCurrent=pStocks;
		i=1;

		pCurrent->prodList.supplier[strlen(pCurrent->prodList.supplier)-1]='\0';
		pCurrent->prodList.product[strlen(pCurrent->prodList.product)-1]='\0';


		while(i<20 && pCurrent!=NULL){
			if(pCurrent->prodList.qtyAvailable>0 && pCurrent->prodList.discRate>0){
				printf("%s", pCurrent->category);
				space[(15-strlen(pCurrent->category))]='\0';
				printf("%s", space);

				printf("%s", pCurrent->prodList.supplier);
				space2[(15-strlen(pCurrent->prodList.supplier))]='\0';
				printf("%s", space2);

				printf("%s ", pCurrent->prodList.prodCode);

				printf("%s", pCurrent->prodList.product);
				space3[(15-strlen(pCurrent->prodList.product))]='\0';
				printf("%s", space3);

				printf("%d", pCurrent->prodList.qtyAvailable);
				space4[(9-numDigits(pCurrent->prodList.qtyAvailable))]='\0';
				printf("%s ", space4);

				printf("%d", pCurrent->prodList.qtySold);
				space5[(4-numDigits(pCurrent->prodList.qtySold))]='\0';
				printf("%s", space5);

				printf("%.2f", pCurrent->prodList.purPrice);
				space6[(6-numDigits(pCurrent->prodList.purPrice))]='\0';
				printf("%s", space6);

				printf("%.2f", pCurrent->prodList.unitSellPrice);
				space7[(5-numDigits(pCurrent->prodList.unitSellPrice))]='\0';
				printf("%s", space7);

				printf("%.1f\n\n", pCurrent->prodList.discRate);

				i++;
			}
			pCurrent=pCurrent->pNext;
		}

		 printf("\n\n page %d of %d \n\n", page, stockNum);
		 page++;
		 scanf("%c", &nextPage);

	}
}
/*Function checkProdCode checks if the input product code was already used in a previous stock.
@param: code - input product code
		*pStock - structure that holds all the stock information
@return: check- integer (0 if product code isn't unique, 1 if it is)
*/
int checkProdCode(string8 code, stockType *pStock){
	int check=1;
	stockType *pOrig = pStock;

	while(pOrig!=NULL)
	{
		if(strcmp(code, pOrig->prodList.prodCode)==0)
		{
			check=0;
			pOrig=NULL;
		}
		else
			pOrig=pOrig->pNext;
	}

	return check;
}



/*Function modifyStockInfo Asks the user if they want to change the stock information
@param: *pStock - structure that holds all the stocks
*/
void modifyStockInfo(stockType *pStock){  //first displays all && then if product code is not found, reurn to managestocksmenu
	string8 code,pTemp;
	stockType *pCurrent=NULL;

	int opt=0,
		i=0,
		j=0,
		k=0,
		randomNum=0,
		found=0;
	char cDump;

	viewStocks(pStock, 1);

	printf("\n\nEnter product code of item to be modified: ");
	scanf("%s%c", code, &cDump);

	pCurrent=pStock;

	while(pCurrent!=NULL && found==0){
		if(strcmp(pCurrent->prodList.prodCode, code)==0)
			found=1;
		if(found==0)
			pCurrent=pCurrent->pNext;
	}

	if(found==1){
		do{
			printf("\n[MODIFY STOCK INFO]\n");
			printf("1 - Modify Category\n");
			printf("2 - Modify Supplier\n");
			printf("3 - Modify Product\n");
			printf("4 - Modify Purchase Price\n");
			printf("5 - Modify Selling Price\n");
			printf("6 - Modify Discount\n");
			printf("7 - Finish Modification of Product <Product Code>\n\n");

			printf("Choose option: ");
			scanf("%d", &opt);

			switch(opt){
				case 1: do{
							printf("New category: ");
							scanf("%s%c", pCurrent->category, &cDump);
						}while(strlen(pCurrent->category)<3 || strlen(pCurrent->category)>15);
						break;
				case 2:	getchar();
						do{
							printf("New supplier: ");
							fgets(pCurrent->prodList.supplier, 16, stdin);
							pCurrent->prodList.supplier[strlen(pCurrent->prodList.supplier)-1]='\0';
						}while(strlen(pCurrent->prodList.supplier)>15);
						break;
				case 3:	getchar();
						do{
							printf("New product: ");
							fgets(pCurrent->prodList.product, 16, stdin);
							pCurrent->prodList.product[strlen(pCurrent->prodList.product)-1]='\0';
						}while(strlen(pCurrent->prodList.product)>15);
						break;
				case 4: printf("New purchase price: ");
						scanf("%f", &pCurrent->prodList.purPrice);
						break;
				case 5: printf("New unit selling price: ");
						scanf("%f", &pCurrent->prodList.unitSellPrice);
						break;
				case 6: printf("New discount rate: ");
						scanf("%f", &pCurrent->prodList.discRate);
						break;
				case 7: strcpy(pTemp,pCurrent->prodList.prodCode);
						if(pCurrent->prodList.prodCode[0]!=pCurrent->category[0])
							pTemp[0]=pCurrent->category[0];
						if(pCurrent->prodList.prodCode[1]!=pCurrent->prodList.supplier[0])
							pTemp[1]=pCurrent->prodList.supplier[0];
						if(pCurrent->prodList.prodCode[2]!=pCurrent->prodList.product[0])
							pTemp[2]=pCurrent->prodList.product[0];

						printf("CHECK PROD CODE: %d\n", checkProdCode(pTemp, pStock));

						if(checkProdCode(pTemp, pStock)!=1){

							i=1;

							while(i<=5){
								randomNum = rand()%58;
								if(randomNum>47 && randomNum<58){
									pTemp[(i+2)]=randomNum;
									i++;
								}
							}
							pTemp[8]='\0';
						}
						strcpy(pCurrent->prodList.prodCode,pTemp);
						printf("Product code is now %s\n", pCurrent->prodList.prodCode);
						break;
			}
		}while(opt!=7);
	}
	else
		printf("Invalid product code");
}

/*Function restock Asks the user which product’s number of items
to they want to modify, then allows them to add to it
@param: *pStock - structure that holds the information of all the stocks
*/
void restock(stockType *pStock){
	string8 code;
	stockType *pCurrent=NULL;
	int	add=0,
		found=0;
	char cDump;

	viewStocks(pStock, 1);

	printf("\n\nEnter product code of item to be modified: ");
	scanf("%s%c", code, &cDump);

	pCurrent=pStock;

	while(pCurrent!=NULL && found==0){
		if(strcmp(pCurrent->prodList.prodCode, code)==0)
			found=1;
		if(found==0)
			pCurrent=pCurrent->pNext;
	}

	if(found==1){
		printf("Additional quantity for this available items: ");
		scanf("%d", &add);
		pCurrent->prodList.qtyAvailable=pCurrent->prodList.qtyAvailable+add;
	}
	else
		printf("\nLast input product Code not found: Not restocked.\n");
}

/*Function stockCount counts the number of stocks
@param: pStocks - structure that holds all the stock information
@return: count - number of stocks
*/
int stockCount(ptrStock pStocks){
	int count=0;

	while(pStocks!=NULL){
		count++;
		pStocks=pStocks->pNext;
	}

	return count;
}

void saveStocksToTextFile(ptrStock pFirst){
	FILE *pText;
	string20 strName;

	if(pFirst == NULL)
		printf("Nothing to save.\n");
	else{
		printf("Enter filename: ");
		scanf("%s", strName);

		pText=fopen(strName, "wt");

		if(pText!=NULL){
			while(pFirst!=NULL){
				fprintf(pText, "%s %s %s\n%d %.2f %s\n%.2f&%.1f %d\n\n",
				pFirst->category, pFirst->prodList.prodCode, pFirst->prodList.product, pFirst->prodList.qtyAvailable,
				pFirst->prodList.purPrice, pFirst->prodList.supplier, pFirst->prodList.unitSellPrice, pFirst->prodList.discRate,
				pFirst->prodList.qtySold);
				pFirst=pFirst->pNext;
		    }
			fclose(pText);
		}
		else
			printf("Error creating file.\n");
	}
}

/*Function manageStocks Displays the Manage Stocks Menu’s
Options (add new stock, view all stocks, view stocks by category, view stocks to reorder, modify stock info,
restock, save inventory, update inventory from file)
and lets the user choose an option.
@param: *pStocks - structure that holds the information of all stocks
		*categoryCtr - number of unique categories
*/
void manageStocks(ptrStock pStocks, int *categoryCtr){
	int opt=0,
	    choose=0;
	char cDump;
	ptrStock pNew=NULL,
			 pRun=NULL,
			 pTrail=NULL;
	string15 category;

	do{
		printf("\n------MANAGE STOCKS MENU------\n");
		printf("1 - Add New Stock\n");
		printf("2 - View All Stocks\n");
		printf("3 - View Stocks by Category\n");
		printf("4 - View Stocks to Reorder\n");
		printf("5 - Modify Stock Info\n");
		printf("6 - Restock\n");
		printf("7 - Save Inventory\n");
		printf("8 - Update Inventory from File\n");
		printf("9 - Return to Admin Menu\n");

		printf("\nCHECK: \n\n\n");
		displayAllStocks(pStocks);

		printf("\nCHECK: New Category! Category number %d\n", *categoryCtr);

		printf("Choose option: ");
			scanf("%d", &opt);

			switch(opt){
				case 1: if(*categoryCtr<10){				//counts the number of categories (max. 10)
						    pNew=malloc(sizeof(stockType));
							pNew->pNext=NULL;

							if(pStocks==NULL){

								addNewStock(pNew, NULL, categoryCtr);
								pStocks=pNew;

							}
							else if(strcmp(pStocks->category, pNew->category)<0){  //connect at first node

									addNewStock(pNew, pStocks, categoryCtr);
									pNew->pNext=pStocks;
									pStocks=pNew;

								  }
								 else{

									addNewStock(pNew, pStocks, categoryCtr);
									pRun=pStocks;

									while(pRun != NULL && strcmp(pRun->category, pNew->category)>0){  //modifying middle of the list

										pTrail=pRun;
										pRun=pRun->pNext;
									}

									pTrail->pNext=pNew;
									pNew->pNext=pRun;

								}
						}
						else
							printf("\nMAXIMUM AMOUNT OF CATEGORIES REACHED. Cannot add any more.\n");

						break;

				case 2: viewStocks(pStocks, 1);
						break;
				case 3: viewStocks(pStocks, 2);
						break;
				case 4: viewStocks(pStocks, 3);
						break;
				case 5: modifyStockInfo(pStocks);
						break;
				case 6: restock(pStocks);
						break;
				case 7: saveStocksToTextFile(pStocks);
						break;

			}
	}while(opt!=9);


}

void saveReceiptToTextFile(ptrUser pFirst, ptrStock pStock){
	FILE *pText;
	string20 strName;
	int items=0,
		i=0;


	items=pFirst->nItems;

	if(pFirst == NULL)
		printf("Nothing to save.\n");
	else{
		printf("Enter filename: ");
		scanf("%s", strName);

		pText=fopen(strName, "wt");

		if(pText!=NULL){
			while(pFirst!=NULL){
				fprintf(pText, "%s %d\n", pFirst->username, pFirst->nItems);
				 	while(items>0){
				 		fprintf(pText, "%d %s ", pFirst->cart[i].qty, pFirst->cart[i].code);
				 		while(pStock!=NULL){
							if(strcmp(pFirst->cart[i].code, pStock->prodList.prodCode)==0)
								fprintf(pText, "%s\n", pStock->prodList.product);
							else
								pStock=pStock->pNext;
						}
						fprintf(pText, "@%.2f&%.1f\n", pStock->prodList.unitSellPrice, pStock->prodList.discRate);

						i++;
						items--;
					 }
				pFirst=pFirst->pNext;
		    }
			fclose(pText);
		}
		else
			printf("Error creating file.\n");
	}
}



void receipt(userType *pUser, stockType *pStock){
	int items=0,
		i=0,
		itemNum=0;
	float itemSubtotal=0.0,
		  totalDisc=0.0,
		  billAmt=0.0;

	items=pUser->nItems;

	printf("DELIVERY RECEIPT:\n");
	printf("User ID: %s\n", pUser->username);
	printf("Customer Name: %s, %s %s\n", pUser->info.name.last, pUser->info.name.first, pUser->info.name.middle);
	printf("Delivery Address: %s\n", pUser->info.address);
	printf("Product     Product    Quantity    Unit Price    Total Price            Item\n");
	printf("Code                                                                    Subtotal\n");

	while(items>0){

		printf("%s", pUser->cart[i].code);
		while(pStock!=NULL){
			if(strcmp(pUser->cart[i].code, pStock->prodList.prodCode)==0)
				printf("%s", pStock->prodList.product);
			else
				pStock=pStock->pNext;
		}
		printf("%d", pUser->cart[i].qty);

		printf("P %.2f", pStock->prodList.unitSellPrice);
		printf("P %.2f", (pStock->prodList.unitSellPrice)*(pUser->cart[i].qty));
		printf("- %.1f", pStock->prodList.discRate);
		itemSubtotal=pStock->prodList.unitSellPrice - (((pStock->prodList.discRate)/100)*pUser->cart[i].qty);
		printf("P %.2f", itemSubtotal);

		itemNum=itemNum+pUser->cart[i].qty;
		totalDisc=totalDisc+pStock->prodList.discRate;
		billAmt=billAmt+itemSubtotal;

		i++;
		items--;
	}

	printf("Number of items: %d\n", itemNum);
	printf("Total Discount: Php %.1f\n", totalDisc);
	printf("Bill Amount: Php %.2f\n", billAmt);
	printf("Total Outstanding: Php %.2f\n", billAmt+pUser->outstanding);

	saveReceiptToTextFile(pUser, pStock);
}

/*Function adminMenu displays the administrator menu and its options once an administrator has logged in
Allows the user to choose an option.
@param: *pUser - structure with information of current user
		*shutdown - option to shutdown (initialized to 0 originally)
		pStock - structure that holds all stock information
		*categoryCtr - number of unique categories
*/
void adminMenu(userType *pUser, int *shutdown, ptrStock pStock, int *categoryCtr){
	int opt;

	do{
		printf("\n------ADMINISTRATOR MENU------\n");
		printf("1 - Manage Accounts Menu\n");
		printf("2 - Manage Stocks Menu\n");
		printf("3 - Prepare Delivery Receipt\n");
		printf("4 - Shutdown Kiosk\n");
		printf("5 - Log Out\n\n");

		printf("Choose option: ");
		scanf("%d", &opt);

		switch(opt){
			case 1: manageAccounts(pUser);
					break;
			case 2: manageStocks(pStock, categoryCtr);
					break;
			case 3:
					break;
			case 4: *shutdown=1;
					break;
			case 5: break;
		}
	}while(opt!=5 && *shutdown==0);
}

/*Function modifyUserInfo Asks the user if they want to change the user info (either name, address, or password).
@param: *pUser - structure that holds all the users
*/
void modifyUserInfo(userType *pUser){
	int opt=0,
		choose=0,
		check=0,
		i;
	char cDump;
	do{
		printf("\n[MODIFY USER INFO]\n");
		printf("1 - Change name\n");
		printf("2 - Change address\n");
		printf("3 - Change password\n");
		printf("4 - Exit\n\n");

		printf("Choose option: ");
		scanf("%d", &opt);


		switch(opt){
			case 1: printf("\n[Editing Options]\n");
					printf("1 - First name\n");
					printf("2 - Middle name\n");
					printf("3 - Last name\n\n");

					do{
						printf("Enter option to edit: ");
						scanf("%d", &choose);
					}while(choose!=1 && choose!=2 && choose!=3);

					getchar();

					switch(choose){
						case 1: printf("New first name: ");
								fgets(pUser->info.name.first, 21, stdin);
								pUser->info.name.first[strlen(pUser->info.name.first)-1]='\0';
								break;
						case 2: printf("New middle name: ");
								fgets(pUser->info.name.middle, 21, stdin);
								pUser->info.name.middle[strlen(pUser->info.name.middle)-1]='\0';
								break;
						case 3: printf("New last name: ");
								fgets(pUser->info.name.last, 21, stdin);
								pUser->info.name.last[strlen(pUser->info.name.last)-1]='\0';
								break;
					}

					printf("New name: %s %s %s\n", pUser->info.name.first, pUser->info.name.middle, pUser->info.name.last);

					break;
			case 2: getchar();
					printf("Enter new address: ");
					fgets(pUser->info.address, 51, stdin);

					//Removes the '\n' because fgets takes the enter key and adds it to the string
					pUser->info.address[strlen(pUser->info.address)-1]='\0';

					printf("New address: %s\n", pUser->info.address);
					break;
			case 3: do{
						printf("Enter new password (6-15 characters, at least one must not be a letter): ");
						scanf("%s%c", pUser->password, &cDump);
						for(i=0; i<strlen(pUser->password); i++){
							if(!(pUser->password[i]>='a' && pUser->password[i]<='z'|| pUser->password[i]>='a' && pUser->password[i]<='z'))
								check=1;
						}
					} while(check==0|| strlen(pUser->password)<6 || strlen(pUser->password)>15);
					break;
			case 4: break;
		}
	}while(opt!=4);

}

/*Function shopperMenu Shows the user the Shopper Menu’s options (modify user info, browse all products, browse products by category, browse products on sale,
add to cart, view cart, check out, edit cart items settle outstanding balance, log out) and allows the user to choose an option.
@param: *pUser - structure that holds the information of all users
		*pStock - structure that holds the information of all stocks
*/
void shopperMenu(userType *pUser, ptrStock pStock){
	int opt=0,
		quantity=0,
		count=1,
		check=0,
		choice=1,
		i=0,
		choice2=0,
		choice3=0,
		newQty=0,
		items=0,
		itemNum=0,
		checkout=0,
		j=0,
		securityCode=0;
	float itemSubtotal=0.0,
		  totalDisc=0.0,
		  cartAmt=0.0,
		  settle=0.0;
	char cDump;
	string8 code,
			prodCode;
	string20 cardNum;
	stockType *pOrig;

	items=pUser->nItems;

	do{
		printf("\n------SHOPPER MENU------\n");
		printf("1 - Modify User Info\n");
		printf("2 - Browse All Products\n");
		printf("3 - Browse Products by Category\n");
		printf("4 - Browse Products on Sale\n");
		if(checkout==0)
			printf("5 - Add to Cart\n");
		printf("6 - View Cart\n");
		printf("7 - Settle Outstanding Balance\n");
		printf("8 - Log Out\n\n");

		printf("Choose option: ");
		scanf("%d", &opt);

		switch(opt){
			case 1:	modifyUserInfo(pUser);
					break;
			case 2: printf("CHECK!!!! %s\n", pStock->category);
					viewStocks(pStock, 4);
					break;
			case 3: viewStocks(pStock, 5);
					break;
			case 4: viewStocks(pStock, 6);
					break;
			case 5: if(pUser->outstanding<pUser->creditlimit && checkout==0){
						do{
							if(check>0){
								printf("Add another item to your cart?(1 for yes, 0 for no): ");
								scanf("%d", &choice);
							}

							if(choice==1){
								printf("Input the ff. details of product you wish to purchase:\n");
								printf("Product code: ");
								scanf("%s%c", code, &cDump);
								printf("Quantity: ");
								scanf("%d", &quantity);

								if(checkProdCode(code, pStock)==1){      //if product code is valid
									pOrig=pStock;
									while(pOrig!=NULL)                  //if quantity is valid
										{
											if(strcmp(code, pOrig->prodList.prodCode)==0)
											{
												if(pOrig->prodList.qtyAvailable>=quantity){

													strcpy(pUser->cart[count].code, code);
													pUser->cart[count].qty=quantity;
													count++;
													check++;

												}
												pOrig=NULL;
											}
											else
												pOrig=pOrig->pNext;
										}
								}
								else
									choice=0;
							}
						}while(count>=1 && choice!=0);
					}
					break;
			case 6: if(pUser->cart[0].qty>0){
						do{
							printf("Product  Product  Quantity  Unit Price  Total Price        Item\n");
							printf("Code                                                       Subtotal\n");

							while(items>0){
								printf("%s", pUser->cart[i].code);
								while(pStock!=NULL){
									if(strcmp(pUser->cart[i].code, pStock->prodList.prodCode)==0)
										printf("%s", pStock->prodList.product);
									else
										pStock=pStock->pNext;
								}
								printf("%d", pUser->cart[i].qty);

								printf("P %.2f", pStock->prodList.unitSellPrice);
								printf("P %.2f", (pStock->prodList.unitSellPrice)*(pUser->cart[i].qty));
								printf("- %.1f", pStock->prodList.discRate);
								itemSubtotal=pStock->prodList.unitSellPrice - (((pStock->prodList.discRate)/100)*pUser->cart[i].qty);
								printf("P %.2f", itemSubtotal);

								itemNum=itemNum+pUser->cart[i].qty;
								totalDisc=totalDisc+pStock->prodList.discRate;
								cartAmt=cartAmt+itemSubtotal;

								i++;
								items--;
							}

							printf("Number of items: %d\n", itemNum);
							printf("Total Discount: Php %.1f\n", totalDisc);
							printf("Cart Amount: Php %.2f\n", cartAmt);


							///////after the display above:
							printf("\n[Options]\n");
							printf("1 - Check out\n");
							printf("2 - Edit Cart Items\n");
							printf("3 - Back to Shopper Menu\n");

							printf("Enter option: ");
							scanf("%d", &choice2);

							switch(choice2){
								case 1: //check out
										items=pUser->nItems;
										i=0;
										while(items>0){
											while(pStock!=NULL){
												if(strcmp(pUser->cart[i].code, pStock->prodList.prodCode)==0){
													pStock->prodList.qtySold=pStock->prodList.qtySold+pUser->cart[i].qty;
													pStock->prodList.qtyAvailable=pStock->prodList.qtyAvailable-pUser->cart[i].qty;
												}
												else
													pStock=pStock->pNext;
											}

											i++;
											items--;
										}

										checkout=1;

										break;
								case 2: do{
											printf("\n[Edit Cart Item Options]\n");
											printf("1 - Remove item\n");
											printf("2 - Update quantity\n");
											printf("3 - Back to View Cart Menu\n");

											printf("Enter option: ");
											scanf("%d", &choice3);

											switch(choice3){
												case 1: printf("Enter product code to remove from cart: ");
														scanf("%s%c", prodCode, &cDump);
														//delete product code input from the cart

														items=pUser->nItems;
														i=0;
														while(items>0){
															printf("%s", pUser->cart[i].code);
															while(pStock!=NULL){
																if(strcmp(pUser->cart[i].code, pStock->prodList.prodCode)==0){
																	j=i;
																	while(pUser->cart[j].qty>0){
																		strcpy(pUser->cart[j].code, pUser->cart[j+1].code);
																		pUser->cart[j].qty=pUser->cart[j+1].qty;

																		j++;
																	}
																}
																else
																	pStock=pStock->pNext;
															}
															items++;
															i++;
														}
														break;
												case 2: printf("Enter product code: ");
														scanf("%s%c", prodCode, &cDump);
														printf("Enter new quantity: ");
														scanf("%d", &newQty);
														//new quantity should be within limits of qty availalble
														//if new qty = 0, prod is removed from cart
														break;
												case 3: break;
											}
										}while(choice3!=3);
										break;
								case 3: break; //back to shopper menu
							}
						}while(choice2!=3);
					}
					break;
			case 7: if(pUser->outstanding>0.00){
						printf("Outstanding balance: P %.2f\n\n", pUser->outstanding);
						printf("[Credit Card Information]\n");
						printf("Card Number: ");
						scanf("%s", cardNum);
						printf("Security Code: ");
						scanf("%d", &securityCode);
						do{
						if(settle>pUser->outstanding)
							printf("Amount to settle must be at most equal to the outstanding balance, or less.\n");
						printf("Enter amount to settle:");
						scanf("%f", &settle);
						}while(settle>pUser->outstanding);
						printf("Payment successful!\n");
					}
					break;
			case 8: break;
		}
	}while(opt!=8);
}

/*Function checkUsername Checks if the input code was already used in a previous stock.
@param: category - input category
		*pStock = structure that holds all the stock information
*/
int checkUsername(string15 username, userType *pUser)
{
	int check=1;
	userType *pOrig = pUser;

	while(pOrig!=NULL)
	{
		if(strcmp(username, pOrig->username)==0)
		{
			check=0;
			pOrig=NULL;
		}
		else
			pOrig=pOrig->pNext;
	}

	return check;
}

/*Function signUp Adds a new user to the current list of users by asking for user information.
@param: *pUser - structure that holds the information of the current user
		*pOriginal - structure that holds the information of all the users
*/
void signUp(userType *pUser, userType *pOriginal){
	userType *pCurrent=NULL, *pTrail;
	string15 username;
	int unique=0;
	char cDump;
	int check, i;
	string8 authorization;

	printf("\n------SIGN UP------\n");

	do{
		printf("Enter username (3-15 characters): ");
		scanf("%s%c", username, &cDump);

			if(strlen(username)>=3 && strlen(username)<=15){
					pCurrent=pOriginal;
					unique=checkUsername(username, pOriginal);
					if(unique==1)
					{
						strcpy(pUser->username, username);
					}
					if(unique!=1)
					{
					printf("Username already exists.\n");

					}
			}

	}while(strlen(pUser->username)<3 || strlen(pUser->username)>15 || unique!=1);

	unique=0;

	do{
		printf("Enter password (6-15 characters, at least one must not be a letter): ");
		scanf("%s", pUser->password);
		for(i=0; i<strlen(pUser->password); i++){
			if(!(pUser->password[i]>='a' && pUser->password[i]<='z'|| pUser->password[i]>='a' && pUser->password[i]<='z'))
					check=1;
		}
	} while(check==0|| strlen(pUser->password)<6 || strlen(pUser->password)>15);

	getUserInfo(&pUser->info);

	do{
		printf("Account type ([S]hopper or [A]dministrator): ");
		scanf("%c%c", &pUser->type, &cDump);
		if(!(pUser->type=='s' || pUser->type=='S' || pUser->type=='a' || pUser->type=='A'))
			printf("Invalid input.\n");
	} while(!(pUser->type=='s' || pUser->type=='S' || pUser->type=='a' || pUser->type=='A'));

	if(pUser->type == 's' || pUser->type == 'S'){
		//shopper account is created
		pUser->creditlimit=5000.00;
		pUser->outstanding=0.00;
		pUser->nItems=0;
		printf("\nSHOPPER ACCOUNT CREATED.\n\n");
	}
	else if(pUser->type == 'a' || pUser->type == 'A'){
			//administrator account is created
			do{printf("Enter authorization code: ");
			scanf("%s", authorization);

			if(strcmp(authorization,"DLSU2017")==0)
				printf("\nADMINISTRATOR ACCOUNT CREATED.\n\n");
			else
				printf("Invalid authorization code.\n");

			}while(strcmp(authorization,"DLSU2017")!=0);

	      }
}

/*Function logIn Allows user to log in their account after signing up by asking for their username and password.
@param: *pUser - structure with information of current user
		accountCount - number of accounts
		*shutdown - shutdown option
		*pStock - structure with list of stocks
		*categoryCtr - number of unique categories
*/
 void logIn(userType *pUser, int accountCount, int *shutdown, ptrStock *pStock, int *categoryCtr){
	userType *pCurrent;
	char cDump;
	string15 username,
			 password;
	int found=0,
		i=0,
		correct=0,
		tries=1,
		exit=0;
	printf("\n------LOG IN------\n");
	//if(pStock!=NULL)
	//	viewStocks(pStock, 1);
	do{
		printf("Username: ");
		scanf("%s%c", username, &cDump);
		pCurrent=pUser;
		while(pCurrent!=NULL && i<=accountCount && found==0){
			if(strcmp(pCurrent->username, username)==0)
				found=1;
			else{
				pCurrent=pCurrent->pNext;
				i++;
			}
		}
		if(found==0)
			printf("Invalid username.\n");
	}while(found==0);

	do{
		printf("Password: ");
		scanf("%s%c", password, &cDump);
		if(strcmp(pCurrent->password, password)!=0){
			correct=0;
			tries++;
		}
		if(tries>3 || pCurrent->isLocked==1){
			pCurrent->isLocked=1;
			printf("\nYou have exceeded the amount of tries to log in.\n");
			printf("Your account is now locked.\n");
			printf("To unlock your account, please contact an administrator.\n\n");
			exit=1;
		}
		else{
			if(strcmp(pCurrent->password, password)==0)
				correct=1;

			if(correct==1)
				if(pCurrent->type=='S' || pCurrent->type=='s'){
					printf("\nGreetings shopper: %s %s %s!\n",
					pCurrent->info.name.first, pCurrent->info.name.middle, pCurrent->info.name.last);
					////SHOPPER MENU!
					shopperMenu(pUser, pStock);
				}
				else{
					printf("\nGreetings administrator: %s %s %s!\n",
					pCurrent->info.name.first, pCurrent->info.name.middle, pCurrent->info.name.last);
					/////ADMIN MENU!!!
					adminMenu(pUser, shutdown, pStock, categoryCtr);
				}
			else
				printf("Incorrect password. You have %d attempts left.\n", 4-tries);
		}
	}while((tries>=3 || correct==0) && exit==0);
}

/*Function main Shows the main menu’s options to the user and allows the user to choose which option (log in or sign up).
*/

/*
void saveToTextFile(ptrUser pFirst){
	FILE *pText;
	string20 strName;

	if(pFirst == NULL)
		printf("Nothing to save.\n");
	else{
		printf("Enter filename: ");
		scanf("%s", strName);

		pText=fopen(strName, "wt");

		if(pText!=NULL){
			while(pFirst!=NULL){
				fprintf(pText, "%s%s\n", pFirst->username, pFirst->password);
				pFirst=pFirst->pNext;
		    }
			fclose(pText);
		}
		else
			printf("Error creating file.\n");
	}
}

void saveStocksToTextFile(ptrStock pFirst){
	FILE *pText;
	string20 strName;

	if(pFirst == NULL)
		printf("Nothing to save.\n");
	else{
		printf("Enter filename: ");
		scanf("%s", strName);

		pText=fopen(strName, "wt");

		if(pText!=NULL){
			while(pFirst!=NULL){
				fprintf(pText, "%s %s %s\n%d %.2f %s\n%.2f&%.1f %d\n\n",
				pFirst->category, pFirst->prodList.prodCode, pFirst->prodList.product, pFirst->prodList.qtyAvailable,
				pFirst->prodList.purPrice, pFirst->prodList.supplier, pFirst->prodList.unitSellPrice, pFirst->prodList.discRate,
				pFirst->prodList.qtySold);
				pFirst=pFirst->pNext;
		    }
			fclose(pText);
		}
		else
			printf("Error creating file.\n");
	}
}

void loadFromText(string20 strFile, ptrUser *pFirst){
	FILE *pFile;
	string20 user,
			 pass;
	ptrUser pNew;

	if((pFile=fopen(strFile, "rt"))!=NULL){
		while(fscanf(pFile, "%s%s", user, pass) == 2){
			printf("%s%s\n", user, pass);
			//creation of the linked list
			pNew=malloc(sizeof(userType));
			strcpy(pNew->username, user);
			strcpy(pNew->password, pass);
			//always insert at head of list
			pNew->pNext=*pFirst;
			*pFirst=pNew;
		}
	fclose(pFile);
	}
	else
		printf("Error opening file.\n");
}
*/

int main(){
	int categoryCtr=0;
	ptrUser pUsers=NULL,
			pNew=NULL,
			pLast=NULL,
			pRun=NULL,
			pTrail=NULL;
	ptrStock pStocks=NULL;

	int opt=0,
	    choose=0,
	    accountCount=0,
	    shutdown=0,
	    check=0;
	char cDump;
	string20 strFile;

	do{
		printf("\n------[MAIN MENU]------\n");
		printf("1 - Log In\n");
		printf("2 - Sign Up\n");
		printf("3 - Shutdown\n\n");
		printf("Choose option: ");
		scanf("%d", &choose);

		if(choose==2){
			do{
				pNew=malloc(sizeof(userType));
				pNew->pNext=NULL;


				if(pUsers==NULL) {								 //list is empty
					signUp(pNew, NULL);
					pUsers=pNew;

				}
				else if(strcmp(pUsers->username, pNew->username)>0){ //connect at first node
					signUp(pNew, pUsers);
					pNew->pNext=pUsers;
					pUsers=pNew;
				}
				else{  												 //modifying middle of the list
					signUp(pNew, pUsers);
					pRun=pUsers;
					while(pRun != NULL && strcmp(pRun->username, pNew->username)<0){
						pTrail=pRun;
						pRun=pRun->pNext;
					}
					pTrail->pNext=pNew;
					pNew->pNext=pRun;
				}

				accountCount++;
				printf("Another user? (1 for yes, 0 for no): ");
				scanf("%d%c", &opt, &cDump);
			}while(opt==1);
		}

		if(choose==1)
			if(pUsers==NULL){
				printf("No accounts made yet.\n");
				check=1;
			}
			else
				logIn(pUsers, accountCount, &shutdown, &pStocks, &categoryCtr);

		if(choose==3)
			opt=1;
	}while((opt==0 && shutdown==0) && choose>2 || check==1);

	freeAll(&pUsers);
	freeAllStocks(&pStocks);

	/*printf("Enter filename: ");
	scanf("%s", strFile);

	saveToTextFile(pUsers);
	loadFromText(strFile, &pUsers);*/

	printf("\nShutting down Kiosk...");
	return 0;
}