Inventory Management System (Ignacio, OJ)

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

//define constant for item per page in display()
#define ITEM_PER_PAGE 10

typedef struct{
    char barcode[5];
    char name[20];
    int quantity;
    char price[10];
    char category[10];
}ITEM;

int main();
void menu();
void add();
void ded();
void display();
void search();
void update();
void login();
void error();

int main()
{
    system("cls");
    int log;
    printf("\n\n\n\t\t\t\tIgnacio's Storage\n");
    printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t [1] Login ");
    printf("\n\t\t\t\t [2] Exit Program ");
    printf("\n\t\t\t\t Enter your choice: ");
    scanf("%d", &log);
    switch(log)
    {
        case 1:
        login();
        break;
        case 2:
        exit(-1);
        break;
        default:
        system("cls");
        printf("\n Wrong input. Please try again.");
        main();

    }
    return 0;
}

void error()
{
    system("cls");
    int log;
    printf("\n\n\n\t\t\t\tIgnacio's Storage\n");
    printf("\n\n\n\n\n\n\t\t\tLogin Failed. Please try again...");
    printf("\n\n\n\n\n\n\t\t\t\t [1] Login ");
    printf("\n\t\t\t\t [2] Exit Program ");
    printf("\n\t\t\t\t Enter your choice: ");
    scanf("%d", &log);
    switch(log)
    {
        case 1:
        login();
        break;
        case 2:
        exit(-1);
        break;
        default:
        system("cls");
        printf("\n Wrong input. Please try again.");
        error();

    }
}


void login()
{
    char username[10];
    char password[10];
    system("cls");
    printf("\n\n\n\t\t\t\tIgnacio's Storage\n");
    printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t USERNAME : ");
    scanf("%s", &username);
    printf("\t\t\t\t PASSWORD : ");
    scanf("%s", &password);

    if(strcmp(username, "Omsss") == 0)
    {
        if(strcmp(password, "123456") == 0)
        {
            menu();
        }
        else
        {
        printf("\nPassword is Incorrect.");
        }
    }
    else
    {
        printf("\nUsername is Incorrect.");
    }
    error();
}

//add new item
void add() {
    system("cls");
    ITEM item;

    FILE *ptr;
    ptr  =  fopen("sample1.txt", "a");

    //file checking. Check if file existed or not
    if (!ptr) {
        printf("ERROR OPENING FILE\n");
        exit(-1);
    }

    printf("Enter Barcode: ");
    scanf(" %[^\n]", &item.barcode);
    printf("Enter item name:: ");
    scanf(" %[^\n]", &item.name);
    printf("Enter Quantity: ");
    scanf(" %d", &item.quantity);
    printf("Enter price: ");
    scanf(" %[^\n]", &item.price);
    printf("Enter category: ");
    scanf(" %[^\n]", &item.category);

    fprintf(ptr,"%s|%s|%d|%s|%s\n",
     item.barcode, item.name, item.quantity, item.price, item.category);
    fclose(ptr);

    printf("record added\n");
    system("pause");
}

//deduct item's quantity
void ded()
{
    char userInputBarcode[5];
    int i=0, arrCount=0, quantity=0;
    ITEM item[1000];
    FILE *ptr;
    ptr = fopen("sample1.txt","r");

    //file checking.Check if file existed or not
    if(!ptr) {
        printf("ERROR OPENING FILE\n");
        exit(-1);
    }

    //read the content of the file and store the content to the structure array
    while (!feof(ptr))
    {
        fscanf(ptr,"%[^|]|%[^|]|%d|%[^|]|%[^\n]\n",
            &item[i].barcode,&item[i].name,
            &item[i].quantity,&item[i].price,&item[i].category);
        i++;
        arrCount++;
    }
    fclose(ptr);

    printf("Enter barcode: ");
    scanf(" %[^\n]", &userInputBarcode);

    //read the content of the structure array
    for (i=0;i<arrCount;i++){
        //compare user input barcode with structure barcode
        //if is true then minus the quantity
        if(strcmp(userInputBarcode, item[i].barcode) == 0){
            //check if user input quantity is valid or not
            //if is not valid, it will loop for user to reenter the value

            do{
                printf("Enter quantity you wanted: ");
                scanf(" %d",&quantity);
            }while(quantity > item[i].quantity || quantity <= 0); //to prevent user for enter value bigger than item's quantity and negative value
            printf("record edited\n");
            system("pause");

            item[i].quantity=item[i].quantity-quantity;
            break;
        }
    }
    fclose(ptr);

    //clear the text file
    ptr = fopen("sample1.txt","w");
    fclose(ptr);

    ptr = fopen("sample1.txt","a");
    //write the text file (updated content)
    for (i=0;i<arrCount;i++){
        fprintf(ptr,"%s|%s|%d|%s|%s\n",
            item[i].barcode,item[i].name,
            item[i].quantity,item[i].price,item[i].category);
    }
    fclose(ptr);
}

//search for item's information by using barcode
void search()
{
    char userInputSearch[20];
    int i = 0, arrCount= 0, existed = 0;
    FILE *ptr;
    ITEM item[200];
    ptr = fopen("sample1.txt", "r");
    //file checking. Check if file existed or not
    if(!ptr){
        printf("ERROR OPENING FILE");
        exit(-1);
    }

    //read the file content and store inside structure array
    i = 0;
    while (!feof(ptr))
    {
        fscanf(ptr ,"%[^|]|%[^|]|%d|%[^|]|%[^\n]\n"
            ,&item[i].barcode
            ,&item[i].name
            ,&item[i].quantity
            ,&item[i].price, &item[i].category);
        i++;
        arrCount++;
    }
    fclose(ptr);

    printf("Please enter barcode: ");
    scanf(" %[^\n]", &userInputSearch);

    printf("SEARCH RESULT\n");

    for(i = 0; i < 62; i++)printf("=");
    printf("\n");
    printf("|%-7s |%-20s |%-8s |%-7s |%-10s|\n"
        ,"BARCODE"
        ,"NAME"
        ,"QUANTITY"
        ,"PRICE"
        ,"CATEGORY");

    for(i = 0; i < 62; i++)printf("=");
    printf("\n");

    for(i = 0; i < arrCount; i++){
        if(strcmp(userInputSearch, item[i].barcode) == 0){
            printf("|%-7s |%-20s |%-8d |%-7s |%-10s|\n"
                ,item[i].barcode
                ,item[i].name
                ,item[i].quantity
                ,item[i].price, item[i].category);
            existed = 1;
        }
    }
    if(!existed){
        printf("%-62s\n", "NO RESULT");
    }

    for(i = 0; i < 62; i++)printf("=");
    printf("\n");
    system("pause");
}

//display all the items information
void display(){
    ITEM item;
    int i = 0, count = 0, page = 1; //count for item count
    FILE *ptr;
    ptr = fopen("sample1.txt", "r");

    //file checking. Check file exist or not
    if(!ptr){
        printf("ERROR OPENING FILE");
        exit(-1);
    }
    printf("PAGE %d\n", page);

    for(i = 0; i < 62; i++)printf("=");
    printf("\n");
    printf("|%-7s |%-20s |%-8s |%-7s |%-10s|\n"
        ,"BARCODE"
        ,"NAME"
        ,"QUANTITY"
        ,"PRICE"
        ,"CATEGORY");

    for(i = 0; i < 62; i++)printf("=");
    printf("\n");

    while(!feof(ptr)){
        if (count == ITEM_PER_PAGE) {
            count = 0; //reset the value of count
            //output end of line
            for (i = 0; i < 62; i++)printf("=");
            printf("\n");
            //pause for user to enter any key to continue for next page
            system("pause");
            system("cls");
            page++;
            //output page number
            printf("PAGE %d\n", page);

            for (i = 0; i < 62; i++)printf("=");
            printf("\n");

            printf("|%-7s |%-20s |%-8s |%-7s |%-10s|\n"
                , "BARCODE"
                , "NAME"
                , "QUANTITY"
                , "PRICE"
                , "CATEGORY");

            for (i = 0; i < 62; i++)printf("=");
            printf("\n");

        }
        fscanf(ptr ,"%[^|]|%[^|]|%d|%[^|]|%[^\n]\n"
            ,&item.barcode
            ,&item.name
            ,&item.quantity
            ,&item.price, &item.category);
        printf("|%-7s |%-20s |%-8d |%-7s |%-10s|\n"
            ,item.barcode
            ,item.name
            ,item.quantity
            ,item.price, item.category);
        count++;
    }

    for(i = 0; i < 62; i++)printf("=");
    printf("\n");

    fclose(ptr);
    system("pause");
}

//update the item's quantity (adding)
void update() {
    char userInputBarcode[5];
    int i = 0, arrCount = 0, quantity = 0;
    ITEM item[1000];
    FILE *ptr;
    ptr = fopen("sample1.txt", "r");

    //file checking.Check if file existed or not
    if (!ptr) {
        printf("ERROR OPENING FILE\n");
        exit(-1);
    }

    //read the content of the file and store the content to the structure array
    while (!feof(ptr))
    {
        fscanf(ptr, "%[^|]|%[^|]|%d|%[^|]|%[^\n]\n",
            &item[i].barcode, &item[i].name,
            &item[i].quantity, &item[i].price, &item[i].category);
        i++;
        arrCount++;
    }
    fclose(ptr);

    printf("Enter barcode: ");
    scanf(" %[^\n]", &userInputBarcode);

    //read the content of the structure array
    for (i = 0; i<arrCount; i++) {
        //compare user input barcode with structure barcode
        //if is true then minus the quantity
        if (strcmp(userInputBarcode, item[i].barcode) == 0) {
            //check if user input quantity is valid or not
            //if is not valid, it will loop for user to reenter the value

            do {
                printf("Enter quantity you wanted: ");
                scanf(" %d", &quantity);
            } while (quantity <= 0); //to prevent user to enter negative value or 0
            printf("record edited\n");
            system("pause");

            item[i].quantity = item[i].quantity + quantity;
            break;
        }
    }
    fclose(ptr);

    //clear the text file
    ptr = fopen("sample1.txt", "w");
    fclose(ptr);

    ptr = fopen("sample1.txt", "a");
    //write the text file (updated content)
    for (i = 0; i<arrCount; i++) {
        fprintf(ptr, "%s|%s|%d|%s|%s\n",
            item[i].barcode, item[i].name,
            item[i].quantity, item[i].price, item[i].category);
    }
    fclose(ptr);

}

void del()
{
    system("cls");
    char userDelete[5];
    int i = 0, arrCount = 0, quantity = 0;
    ITEM item[1000];
    FILE *ptr, *pt2;
    ptr = fopen("sample1.txt", "r");

    //file checking.Check if file existed or not
    if (!ptr) {
        printf("ERROR OPENING FILE\n");
        exit(-1);
    }
    ptr = fopen("sample1.txt","a");
    if (!ptr)
    {
    printf("ERROR OPENING FILE\n");
    exit(-1);
    }
    rewind(ptr);
    printf("\n DELETE ITEM \n");
    printf("Please enter barcode: ");
    scanf(" %[^\n]", &userDelete);
    pt2 = fopen("temp.txt","wb");
    while (!feof(ptr))
    {
        fscanf(ptr, "%[^|]|%[^|]|%d|%[^|]|%[^\n]\n",
            &item[i].barcode, &item[i].name,
            &item[i].quantity, &item[i].price, &item[i].category);
        i++;
        arrCount++;
    }
    if (strcmp(userDelete, item[i].barcode) == 0)
    {
    fprintf(ptr, "%[^|]|%[^|]|%d|%[^|]|%[^\n]\n",
            &item[i].barcode, &item[i].name,
            &item[i].quantity, &item[i].price, &item[i].category);
    }
    fclose(ptr);
    fclose(pt2);
    remove("sample1.txt");
    rename("temp.txt","sample1.txt");
    ptr = fopen("sample1.txt","rb+");
}
void menu(){
    system("cls");
    int ad=0;

    printf("\nWhat would you like to do? \n");
    printf("\n [1] Display All Item");
    printf("\n [2] Search Item");
    printf("\n [3] Add New Item");
    printf("\n [4] Update/Deduct Item's Quantity");
    printf("\n [5] Delete Item");
    printf("\n [6] Exit\n");
    printf("\n Select your choice: ");
    scanf(" %d", &ad);
    switch(ad){
        case 1:
            system("cls");
            display();
            menu();
            break;

        case 2:
            system("cls");
            search();
            menu();
            break;

        case 3:
            system("cls");
            add();
            menu();
            break;

        case 4:
            system("cls");
            ad = 0; //reset the ad variable

            printf("\nUPDATE/DEDUCT QUANTITY FUNCTION\n");
            printf("\n [1] Update Quantity");
            printf("\n [2] Deduct Quantity");
            printf("\n [3] Back");
            printf("\n Select your choice: ");
            scanf(" %d", &ad);
            switch (ad)
            {
            case 1: update(); break;
            case 2: ded(); break;
            case 3: main(); break;
            default:
                printf("\n Wrong Choice. Please select again.");
                break;
            }
            menu();
            break;

        case 5:
            system("cls");
            del();
            break;
        case 6:
            main();
            break;
        default:
            system("cls");
            printf("\n Wrong Choice. Please select again.");
    }
}