#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
 
// โครงสร้างข้อมูลสินค้า
struct Product {
    char name[50];
    int quantity;
    time_t expiryDate;
    int threshold; // จำนวนขั้นต่ำที่ต้องแจ้งเตือน
};
 
// ฟังก์ชันสำหรับตรวจสอบวันหมดอายุ
int isExpired(time_t expiryDate) {
    return difftime(expiryDate, time(0)) < 0;
}
 
// ฟังก์ชันสำหรับแสดงวันที่ในรูปแบบที่กำหนด
void formatDate(time_t date, char* buffer) {
    struct tm t;
    localtime_r(&date, &t);
    strftime(buffer, 20, "%Y-%m-%d", &t);
}
 
int main() {
    struct Product products[10]; // กำหนดขนาดสูงสุดของสินค้า
    int numProducts = 0;
 
    // เพิ่มข้อมูลสินค้า (สามารถเพิ่มได้มากกว่านี้)
    strcpy(products[numProducts].name, "นมสด");
    products[numProducts].quantity = 10;
    products[numProducts].expiryDate = time(0) + 30 * 24 * 60 * 60; // หมดอายุใน 30 วัน
    products[numProducts].threshold = 5;
    numProducts++;
 
    strcpy(products[numProducts].name, "ไข่ไก่");
    products[numProducts].quantity = 5;
    products[numProducts].expiryDate = time(0) + 14 * 24 * 60 * 60; // หมดอายุใน 14 วัน
    products[numProducts].threshold = 10;
    numProducts++;
 
    strcpy(products[numProducts].name, "ขนมปัง");
    products[numProducts].quantity = 20;
    products[numProducts].expiryDate = time(0) + 7 * 24 * 60 * 60; // หมดอายุใน 7 วัน
    products[numProducts].threshold = 15;
    numProducts++;
 
    // ตรวจสอบสินค้าแต่ละรายการ
    for (int i = 0; i < numProducts; i++) {
        char expiryDateStr[20];
        formatDate(products[i].expiryDate, expiryDateStr);
 
        printf("สินค้า: %s\n", products[i].name);
        printf("จำนวน: %d\n", products[i].quantity);
        printf("วันหมดอายุ: %s\n", expiryDateStr);
 
        if (products[i].quantity < products[i].threshold) {
            printf("คำเตือน: สินค้า %s เหลือน้อยกว่า %d หน่วย!\n", products[i].name, products[i].threshold);
        }
 
        if (isExpired(products[i].expiryDate)) {
            printf("คำเตือน: สินค้า %s หมดอายุแล้ว!\n", products[i].name);
        }
 
        printf("\n");
    }
 
    return 0;
}

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