#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#define MAX_PRODUCTS 100
#define FILENAME "products.txt"
 
// Struct for storing product information
typedef struct {
    int id;
    char name[50];
    float price;
    int stock;
} Product;
 
// Function declarations
void addProduct(Product products[], int *productCount);
void displayProducts(Product products[], int productCount);
void editProduct(Product products[], int productCount);
void deleteProduct(Product products[], int *productCount);
void sellProduct(Product products[], int *productCount);
void saveToFile(Product products[], int productCount);
void loadFromFile(Product products[], int *productCount);
 
int main() {
    Product products[MAX_PRODUCTS];
    int productCount = 0;
    int choice;
 
    // Load data from file
    loadFromFile(products, &productCount);
 
    while (1) {
        printf("\n===== Shop Management System =====\n");
        printf("1. Add New Product\n");
        printf("2. Display Products\n");
        printf("3. Edit Product Information\n");
        printf("4. Delete Product\n");
        printf("5. Sell Product\n");
        printf("6. Save Data to File\n");
        printf("7. Exit Program\n");
        printf("Select an option: ");
        scanf("%d", &choice);
 
        switch (choice) {
            case 1:
                addProduct(products, &productCount);
                break;
            case 2:
                displayProducts(products, productCount);
                break;
            case 3:
                editProduct(products, productCount);
                break;
            case 4:
                deleteProduct(products, &productCount);
                break;
            case 5:
                sellProduct(products, &productCount);
                break;
            case 6:
                saveToFile(products, productCount);
                break;
            case 7:
                printf("Saving data and exiting the program\n");
                saveToFile(products, productCount);
                return 0;
            default:
                printf("Invalid option!\n");
        }
    }
}
 
void addProduct(Product products[], int *productCount) {
    if (*productCount >= MAX_PRODUCTS) {
        printf("Cannot add more products\n");
        return;
    }
 
    Product newProduct;
    newProduct.id = *productCount + 1;
 
    printf("Product Name: ");
    scanf(" %[^
]", newProduct.name);
 
    printf("Price: ");
    scanf("%f", &newProduct.price);
 
    printf("Stock Quantity: ");
    scanf("%d", &newProduct.stock);
 
    products[*productCount] = newProduct;
    (*productCount)++;
 
    printf("Product added successfully!\n");
}
 
void displayProducts(Product products[], int productCount) {
    if (productCount == 0) {
        printf("No products available\n");
        return;
    }
 
    printf("\nProduct List\n");
    printf("====================\n");
    for (int i = 0; i < productCount; i++) {
        printf("ID: %d | Name: %s | Price: %.2f | Stock: %d\n", 
               products[i].id, products[i].name, products[i].price, products[i].stock);
    }
}
 
void editProduct(Product products[], int productCount) {
    int id;
    printf("Enter the product ID to edit: ");
    scanf("%d", &id);
 
    for (int i = 0; i < productCount; i++) {
        if (products[i].id == id) {
            printf("New Product Name: ");
            scanf(" %[^
]", products[i].name);
 
            printf("New Price: ");
            scanf("%f", &products[i].price);
 
            printf("New Stock Quantity: ");
            scanf("%d", &products[i].stock);
 
            printf("Product information updated successfully!\n");
            return;
        }
    }
    printf("Product with ID %d not found\n", id);
}
 
void deleteProduct(Product products[], int *productCount) {
    int id;
    printf("Enter the product ID to delete: ");
    scanf("%d", &id);
 
    for (int i = 0; i < *productCount; i++) {
        if (products[i].id == id) {
            for (int j = i; j < *productCount - 1; j++) {
                products[j] = products[j + 1];
            }
            (*productCount)--;
            printf("Product deleted successfully!\n");
            return;
        }
    }
    printf("Product with ID %d not found\n", id);
}
 
void sellProduct(Product products[], int *productCount) {
    int id, quantity;
    printf("Enter the product ID to sell: ");
    scanf("%d", &id);
 
    for (int i = 0; i < *productCount; i++) {
        if (products[i].id == id) {
            printf("Quantity to sell: ");
            scanf("%d", &quantity);
 
            if (quantity > products[i].stock) {
                printf("Not enough stock!\n");
            } else {
                products[i].stock -= quantity;
                printf("Product sold successfully. Total: %.2f\n", products[i].price * quantity);
            }
            return;
        }
    }
    printf("Product with ID %d not found\n", id);
}
 
void saveToFile(Product products[], int productCount) {
    FILE *file = fopen(FILENAME, "w");
    if (file == NULL) {
        printf("Unable to save data to file\n");
        return;
    }
 
    for (int i = 0; i < productCount; i++) {
        fprintf(file, "%d,%s,%.2f,%d\n", products[i].id, products[i].name, products[i].price, products[i].stock);
    }
 
    fclose(file);
    printf("Data saved successfully!\n");
}
 
void loadFromFile(Product products[], int *productCount) {
    FILE *file = fopen(FILENAME, "r");
    if (file == NULL) {
        printf("No data file found. Starting with an empty system\n");
        return;
    }
 
    *productCount = 0;
    while (fscanf(file, "%d,%49[^,],%f,%d\n", &products[*productCount].id, products[*productCount].name, &products[*productCount].price, &products[*productCount].stock) != EOF) {
        (*productCount)++;
    }
 
    fclose(file);
    printf("Data loaded successfully!\n");
}
 

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