Programming Project

/*
  This source code is written in Linux
  some syntax will not be recognized
  by Windows compiler. If you faced a
  problem, please review and fix the code
  yourself.

  SESSIONS VARIABLES
    - temporary and will be cleared after the session is over
  TRANSACTIONS VARIABLES
    - record sessions data
*/

#include <stdio.h>
#include <string.h>
#include <time.h>
#include <ctype.h>

#ifdef linux
#define CLS_NAME "clear"
#include <ncurses.h>
#else
#define CLS_NAME "cls"
#endif

// GLOBAL VARIABLES DECLARATIONS
/*
    itemQuantity[][0] = Item Qty in inventory
    itemQuantity[][1] = Item Qty in a session
    itemQuantity[][2] = Item Qty in all transactions
    item_Price_Profit[][0] = Item Price
    item_Price_Profit[][1] = Item Profit
*/
int totalItem=13,itemQuantity[100][3]={8,0,0,9,0,0,11,0,0,0,0,0,20,0,0,22,0,0,16,0,0,18,0,0,9,0,0,7,0,0,5,0,0,12,0,0,0,0,0},sessionQuantity,sessionNumber=1,hiddenItemQuantity[]={},itemId;
float item_Price_Profit[100][2]={1,0.5,2,0.2,3,0.2,4,0.2,5,0.5,6,0.8,7,0.5,8,0.2,9,0.2,10,0.2,11,0.5,12,0.8,13,0.9},sesionTotalPrice,transactionTotalProfit=0,transactionTotalPrice=0,sessionPayment;
char itemName[100][30]={"STABILO PENCIL 2B","STABILO PEN 0.5","STABILO ERASER","STABILO RULER","STABILO TEST PAD","STABILO BOOK","STABILO SCISSORS","STABILO SHARPENER","STABILO GLUE","STABILO CHALK","STABILO MARKER PEN","OXFORD DICTIONARY","STABILO HIGHLIGHTER"},dummy,str[3],customer[15];

// FUNCTIONS PROTOTYPES
void showTime();void menuSelection(int);void newTransaction();void allTransactions();void addItem();void reviewCart();void removeItem();void sessionReceipt();void gotoMenu();void calcQuantity(int);void allStocks();void addStock();void addStockItem();void editStockItem();void hideStockItem();void getItemId(int);void getItemQty();void getNewItemProfit(int);void getAuth();int validateNum();void validateItemName(int,int);

// DISPLAY MENU
main(){
    int choice;
    system(CLS_NAME);
    showTime();
    printf("Assalamualaikum\n\nMAIN MENU :\n\n    1 - New Transaction\n    2 - All Transactions\n    3 - Stocks (Manager ONLY)\n\nPlease select an option : ");
    scanf(" %s",str);
    if(validateNum(str)==1) choice = atoi(str);
    else main();
    if(choice>0&&choice<4) menuSelection(choice);
    else main();
}

// SHOW CURRENT DATE AND TIME
void showTime(){
    time_t mytime;
    mytime = time(NULL);
    printf("---------------------%24s\n",ctime(&mytime));
}

// MENU SELECTION
void menuSelection(int choice){
    if(choice!=6) system(CLS_NAME);
    switch(choice){
        case 1  :   sesionTotalPrice = 0;
                    system(CLS_NAME);
                    printf("CUSTOMER NAME : ");
                    scanf(" %15[^\n]",customer);
                    for(choice=0;choice<15;choice++) customer[choice] = toupper(customer[choice]);
                    newTransaction();break;
        case 2  :   allTransactions();break;
        case 3  :   getAuth(); break;
                    //allStocks(); break;
        case 4  :   addStock();break;
        case 5  :   addStockItem();break;
        case 6  :   getItemId(3);
                    editStockItem();break;
        case 7  :   getItemId(4);
                    hideStockItem();break;
        case 8  :   main();break;
        default :   main();break;
    }
}

// SHOWS AVAILABLE ITEMS LIST INCLUDING OUT OF STOCK ITEMS
void newTransaction(){
    int i;
    system(CLS_NAME); //system("cls");
    printf("INVENTORY           SESSION NO  :       %3d\n",sessionNumber);
    printf("CUSTOMER: %-15s TOTAL : RM %6.2f\n\n",customer,sesionTotalPrice);
    printf("ID  Item                        Qty   Price\n");
    printf("-------------------------------------------\n");
    for (i=0;i<totalItem;i++){
        if (itemQuantity[i][0]==-1) ;
        else if (itemQuantity[i][0]==0) printf("%-2d  %-27sOUT OF STOCK\n",i,itemName[i]);
        else printf("%-2d  %-28s%3d  %6.2f\n",i,itemName[i],itemQuantity[i][0],item_Price_Profit[i][0]);
    }
    printf("-------------------------------------------\n");
    printf("-1 VIEW CART\n99 CHECK OUT\n");
    addItem();
}

// ADD ITEM TO CART
void addItem(){
    getItemId(1);
    if (itemId==-1) reviewCart();
    if (itemId==99) sessionReceipt();
    if (itemId>=totalItem) newTransaction();
    if (itemQuantity[itemId][0]==0||itemQuantity[itemId][0]==-1) {
        printf("--UNAVAILABLE--\n");
        sleep(1);
        newTransaction();
    }
    if (itemQuantity[itemId][0]==1) {
        itemQuantity[itemId][0] --;
        itemQuantity[itemId][1] ++;
        itemQuantity[itemId][2] ++;
        sesionTotalPrice += item_Price_Profit[itemId][0];
        newTransaction();
    }
    getItemQty();
    if (sessionQuantity<0){
        printf("--INVALID--\n");
        sleep(1);
        newTransaction();
    }
    if (sessionQuantity>itemQuantity[itemId][0]){
        printf("--INSUFFICIENT--\n");
        sleep(1);
        newTransaction();
    }
    calcQuantity(1);
    newTransaction();
}

// DISPLAY ALL ITEMS ADDED TO CART
void reviewCart(){
    int i;
    system(CLS_NAME); //system("cls");
    printf("INVENTORY           SESSION NO  :       %3d\n",sessionNumber);
    printf("CUSTOMER: %-15s TOTAL : RM %6.2f\n\n",customer,sesionTotalPrice);
    printf("ID  Item                       Price Amount\n");
    printf("-------------------------------------------\n");
    for (i=0;i<totalItem;i++){
        if (itemQuantity[i][1]!=0)
            printf("%-2d %2dx%-24s %5.2f %6.2f\n",i,itemQuantity[i][1],itemName[i],item_Price_Profit[i][0],item_Price_Profit[i][0]*itemQuantity[i][1]);
    }
    printf("                                     ------\n");
    printf("SUB TOTAL                            %6.2f\n",sesionTotalPrice);
    printf("-------------------------------------------\n");
    printf("-1 BROWSE INVENTORY\n99 CHECK OUT\n");
    removeItem();
}

// REMOVE ITEM FROM CART
void removeItem(){
    getItemId(2);
    if (itemId==-1) newTransaction();
    if (itemId==99) sessionReceipt();
    if (itemId>=totalItem) removeItem();
    if (itemQuantity[itemId][1]==1) {
        itemQuantity[itemId][0] ++;
        itemQuantity[itemId][1] --;
        itemQuantity[itemId][2] --;
        sesionTotalPrice -= item_Price_Profit[itemId][0];
        reviewCart();
    }
    if (itemQuantity[itemId][1]==0||itemQuantity[itemId][0]==-1) {
        printf("--ITEM INEXISTENT--\n");
        sleep(1);
        reviewCart();
    }
    getItemQty();
    if (sessionQuantity<0){
        printf("--INVALID--\n");
        sleep(1);
        reviewCart();
    }
    if (sessionQuantity>itemQuantity[itemId][1]){
        printf("--INSUFFICIENT--\n");
        sleep(1);
        reviewCart();
    }
    calcQuantity(-1);
    reviewCart();
}

/*GET TARGET ITEM ID :
    1=TO BE ADDED TO CART,
    2=TO BE REMOVED FROM CART,
    3=TO BE EDITED,
    4=TO BE REMOVED,*/
void getItemId(int i){
    switch(i){
        case 1 :    printf("\nPlease enter Item ID to add to cart : ");break;
        case 2 :    printf("\nPlease enter Item ID to hide from cart : ");break;
        case 3 :    printf("ID of item to be edited : ");break;
        case 4 :    printf("ID of item to be hide/unhide : ");break;
        case 5 :    printf("ID of item to be restocked : ");break;
    }
    scanf(" %s",str);
    if(validateNum(str)==1) itemId = atoi(str);
    else getItemId(i);
    if(i==3 && itemId>=totalItem) {
        printf("Item does not exist. Create? Y to confirm : ");
        scanf(" %c",&dummy);
        if(toupper(dummy)!='Y') allStocks();
        itemId = totalItem++;
    }
}

// GET TARGET ITEM QTY
void getItemQty(){
    printf("Please enter Item Quantity : ");
    scanf(" %s",str);
    if(validateNum(str)==1) sessionQuantity = atoi(str);
    else getItemQty();
}

// DISPLAY SESSION RECEIPT - ONE TIME ONLY
void sessionReceipt(){
    int i;
    system(CLS_NAME); //system("cls");
    showTime();
    printf("                       Receipt number : %3d\n",sessionNumber);
    printf("---------------------------------------------\n");
    printf("ID  Item                        Price  Amount\n");
    for (i=0;i<totalItem;i++){
        if (itemQuantity[i][1]!=0)
            printf("%-2d %2dx%-24s %6.2f  %6.2f\n",i,itemQuantity[i][1],itemName[i],item_Price_Profit[i][0],item_Price_Profit[i][0]*itemQuantity[i][1]);
        if(sessionPayment!=0) itemQuantity[i][1]=0;
    }
    printf("                                      -------\n");
    printf("SUB TOTAL                             %7.2f\n",sesionTotalPrice);
    printf("                                      -------\n");
    if(sessionPayment==0){
        printf("CASH     : ");
        scanf(" %s",str);
        if(validateNum(str)==1) sessionPayment = atoi(str);
        else sessionReceipt();
        sessionReceipt();
    }else printf("CASH     : %.2f\n",sessionPayment);
    printf("CHANGE   : %.2f\n",sessionPayment-sesionTotalPrice);
    printf("\n---------------------------------------------\n");
    printf("-------------THANK YOU FOR COMING------------\n");
    printf("---------------------------------------------\n");
    transactionTotalPrice += sesionTotalPrice;
    sessionNumber++;
    sessionPayment=0;
    gotoMenu();
}

// DISPLAY TOTAL TRANSACTIONS
void allTransactions(){
    int i;
    system(CLS_NAME); //system("cls");
    showTime();
    printf("ALL TRANCTIONS\n\n");
    printf("ID  Item                        Price  Profit\n");
    printf("---------------------------------------------\n");
    for (i=0;i<totalItem;i++){
        if (itemQuantity[i][2]!=0)
            printf("%-2d %2dx%-24s%7.2f %7.2f\n",i,itemQuantity[i][2],itemName[i],item_Price_Profit[i][0]*itemQuantity[i][2],item_Price_Profit[i][1]*itemQuantity[i][2]);
        transactionTotalProfit += item_Price_Profit[i][1]*itemQuantity[i][2];
    }
    printf("                              ------- -------\n");
    printf("TOTAL                         %7.2f %7.2f\n",transactionTotalPrice,transactionTotalProfit);
    printf("                              ------- -------\n");
    printf("TOTAL TRANSACTIONS                    %7d\n",sessionNumber-1);
    printf("---------------------------------------------\n");
    transactionTotalProfit = 0;
    gotoMenu();
}

// PAUSE PROGRAM AND CONTINUE WITH ENTER
void gotoMenu(){
    printf("\n\nPress Enter to continue...");
    dummy = getchar();
    while (getchar() != '\n');
    main();
}

// CALCULATE QUANTITY IN SESSIONS AND TRANSACTIONS
void calcQuantity(int i){
    itemQuantity[itemId][1] += (i*sessionQuantity);
    itemQuantity[itemId][2] += (i*sessionQuantity);
    itemQuantity[itemId][0] -= (i*sessionQuantity);
    sesionTotalPrice += (i*sessionQuantity*item_Price_Profit[itemId][0]);
}

// DISPLAY ALL STOCKS TABLE
void allStocks(){
    int i,choice;
    system(CLS_NAME);
    printf("INVENTORY\n");
    printf("ID  Item                        Qty   Price   Profit\n");
    printf("+----------------------------------------------------+\n");
    for (i=0;i<totalItem;i++){
        if(itemQuantity[i][0]==-1) printf("|%-2d  %-31sITEM HAS BEEN HID|\n",i,itemName[i]);
        else printf("|%-2d  %-28s%3d   %5.2f   %6.2f|\n",i,itemName[i],itemQuantity[i][0],item_Price_Profit[i][0],item_Price_Profit[i][1]);
    }
    printf("+----------------------------------------------------+\n");
    printf("MENU :\n\n    1 - Add Stock\n    2 - New Item\n    3 - Edit Item\n    4 - Hide/Unhide Item\n    5 - Main Menu\n\nPlease select an option : ");
    scanf(" %s",str);
    if(validateNum(str)==1) choice = atoi(str);
    else allStocks();
    choice += 3;
    if(choice>3&&choice<9) menuSelection(choice);
    else allStocks();
}

// ADD STOCK
void addStock(){
    getItemId(5);
    if(itemQuantity[itemId][0]==-1){
        printf("UNHIDE ITEM BEFORE ADD STOCK\n");
        sleep(1);
        allStocks();
    }
    getItemQty();
    itemQuantity[itemId][0] += sessionQuantity;
    allStocks();
}

// ADD NEW ITEM
void addStockItem(){
    int i;
    system(CLS_NAME);
    printf("New Item\n\n");
    printf("New Item Name   : ");
    scanf(" %30[^\n]", itemName[totalItem]);
    for (i=0;i<30;i++) itemName[totalItem][i] = toupper(itemName[totalItem][i]);
    printf("New Item Price  : ");
    scanf(" %f",&item_Price_Profit[totalItem][0]);
    getNewItemProfit(totalItem);
    printf("New Item Qty    : ");
    scanf(" %d",&itemQuantity[totalItem][0]);
    itemQuantity[totalItem][1]=0;
    itemQuantity[totalItem][2]=0;
    validateItemName(1,totalItem);
    ++totalItem;
    allStocks();
}

// EDIT ITEM
void editStockItem(){
    int i;
    system(CLS_NAME);
    printf("Name   : %s\n",itemName[itemId]);
    printf("Price  : %.2f\n",item_Price_Profit[itemId][0]);
    printf("Profit : %.2f\n",item_Price_Profit[itemId][1]);
    printf("Qty    : %d\n",itemQuantity[itemId][0]);
    printf("\nEdit \n\n    1 - Name\n    2 - Price\n    3 - Profit\n    4 - Quantity\n    5 - Back to Stocks\n\nPlease select what to edit: ");
    scanf(" %s",str);
    if(validateNum(str)==1) i = atoi(str);
    else editStockItem();
    switch(i){
        case 1  :   printf("New Item Name   : ");
                    strcpy(itemName[99],itemName[itemId]);
                    scanf(" %30[^\n]", itemName[itemId]);
                    for (i=0;i<30;i++) itemName[itemId][i] = toupper(itemName[itemId][i]);
                    break;
        case 2  :   printf("New Item Price  : ");
                    scanf(" %f",&item_Price_Profit[itemId][0]);break;
        case 3  :   getNewItemProfit(itemId);break;
        case 4  :   printf("New Item Qty    : ");
                    scanf(" %d",&itemQuantity[itemId][0]);break;
        case 5  :   allStocks();break;
        default :   break;
    }
    validateItemName(0,itemId);
    editStockItem();
}

// MAKE SURE PROFIT NOT MORE THAN HALF PRICE
void getNewItemProfit(int i){
    printf("New Item Profit : ");
    scanf(" %f",&item_Price_Profit[i][1]);
    while(item_Price_Profit[i][1]>item_Price_Profit[i][0]/2){
        printf("Profit more than half of item's price. Please reduce!\n    New Item Profit : ");
        scanf(" %f",&item_Price_Profit[i][1]);
    }
}

// HIDE ITEM FROM MENU
void hideStockItem(){
    if(itemQuantity[itemId][0]!=-1) {
        hiddenItemQuantity[itemId]=itemQuantity[itemId][0];
        itemQuantity[itemId][0]=-1;
    }
    else itemQuantity[itemId][0]=hiddenItemQuantity[itemId];
    allStocks();
}

// ONLY AUTHORIZED USER CAN VIEW ALL STOCKS
void getAuth(){
    int i;
    char user[][10]={"manager","134562"},authdummy[10]={};
    system(CLS_NAME);
    printf("USER : ");
    scanf(" %s",&*authdummy);
    for(i=0;i<10;i++){
        if(authdummy[i]!=user[0][i]){
            printf("ONLY A MANAGER CAN VIEW THIS PAGE\n");
            sleep(1);
            main();
        }
    }
    printf("PASS : ");
    fflush(stdin); // experimental
    for(i=0;i<6;i++){
        authdummy[i] = getch();
        if(authdummy[i]=='\n') break;
        printf("*");
    }
    for(i=0;i<6;i++){
        if(authdummy[i]!=user[1][i]){
            printf("\nWRONG PASSWORD\n");
            sleep(1);
            main();
        }
    }
    allStocks();
}

// MAKE SURE ITEM NAMES' ARE UNIQUE
void validateItemName(int add,int id){
    int i;
    for (i = 0; i < totalItem; ++i)
    {
        if (!strcmp(itemName[id],itemName[i]) && id!=i){
            if(add==1){
                item_Price_Profit[i][0] = item_Price_Profit[id][0];
                item_Price_Profit[i][1] = item_Price_Profit[id][1];
                itemQuantity[i][0] += itemQuantity[id][0];
                for (i = 0; i < 30; ++i)itemName[id][i] = '\0';
                item_Price_Profit[id][0] = 0;
                item_Price_Profit[id][1] = 0;
                itemQuantity[id][0] = 0;
                --totalItem;
            }else{
                printf("Item Exists\n");
                sleep(1);
                strcpy(itemName[id],itemName[99]);
                editStockItem();
            }
        }
    }
}

// MAKE SURE INPUTS ARE FOOLPROOF
int validateNum(char *p){
    if (*p) {
        char c;
        while ((c=*p++)) if (!isdigit(c)&&c!='-') return 0;
        return 1;
    }
    return 0;
}