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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h> // Include this for access() function.

// Structure to store item information.
struct Item {
    int id;
    char name[100];
    char model[100];
    char config[100];
    char hash[100];
};

// Function to create a directory in the user's Documents folder.
void createCustomDirectory(const char *directoryName) {
    char documentsPath[200];
    const char *homeDirectory = getenv("HOME");

    if (homeDirectory == NULL) {
        fprintf(stderr, "ERROR: -(Unable to get user's home directory)-\n");
        exit(1);
    }

    snprintf(documentsPath, sizeof(documentsPath), "%s/Documents", homeDirectory);

    char customDirPath[250];
    snprintf(customDirPath, sizeof(customDirPath), "%s/%s", documentsPath, directoryName);

    // Split the path and create parent directories if they don't exist.
    char *dir = customDirPath;
    while ((dir = strchr(dir + 1, '/')) != NULL) {
        *dir = '\0';
        if (access(customDirPath, F_OK) == -1) {
            if (mkdir(customDirPath, 0700) == -1) {
                fprintf(stderr, "ERROR: -(Unable to create custom directory)-\n");
                exit(1);
            }
        }
        *dir = '/';
    }

    // Create the final directory.
    if (access(customDirPath, F_OK) == -1) {
        if (mkdir(customDirPath, 0700) == -1) {
            fprintf(stderr, "ERROR: -(Unable to create custom directory)-\n");
            exit(1);
        }
    }
}

// Function to display the menu.
void displayMenu() {
    printf("Menu:\n");
    printf("1. Add Item\n");
    printf("2. View Items\n");
    printf("3. Search Item by ID\n");
    printf("4. Save Items to .snet File\n");
    printf("5. Exit Program\n");
}

// Function to add an item.
void addItem(struct Item **items, int *itemCount) {
    struct Item item;
    printf("Enter Item ID: ");
    scanf("%d", &item.id);

    printf("Enter Item Name: ");
    scanf("%s", item.name);

    printf("Enter Item Model: ");
    scanf("%s", item.model);

    printf("Enter Item Config: ");
    scanf("%s", item.config);

    printf("Enter Item Hash: ");
    scanf("%s", item.hash);

    (*itemCount)++;
    *items = (struct Item *)realloc(*items, (*itemCount) * sizeof(struct Item));
    if (*items == NULL) {
        fprintf(stderr, "ERROR: -(Unable to allocate memory)-\n");
        exit(1);
    }
    (*items)[(*itemCount) - 1] = item;
    printf("SUCCESS: -(Item added)-.\n");
}

// Function to compare items for sorting by ID.
int compareItems(const void *a, const void *b) {
    return ((struct Item *)a)->id - ((struct Item *)b)->id;
}

// Function to view all items sorted by ID.
void viewItems(struct Item *items, int itemCount) {
    if (itemCount == 0) {
        printf("ERROR: -(No items to display)-\n");
        return;
    }
    qsort(items, itemCount, sizeof(struct Item), compareItems);

    printf("Items:\n");
    printf("ID\tName\tModel\tConfig\tHash\n");
    for (int i = 0; i < itemCount; i++) {
        printf("%d\t%s\t%s\t%s\t%s\n", items[i].id, items[i].name, items[i].model, items[i].config, items[i].hash);
    }
}

// Function to search for an item by ID
void searchItemByID(struct Item *items, int itemCount, int searchID) {
    for (int i = 0; i < itemCount; i++) {
        if (items[i].id == searchID) {
            printf("SUCCESS: -(Item Found)-\n");
            printf("ID\tName\tModel\tConfig\tHash\n");
            printf("%d\t%s\t%s\t%s\t%s\n", items[i].id, items[i].name, items[i].model, items[i].config, items[i].hash);
            return;
        }
    }
    printf("ERROR: -(Item with ID %d not found)-\n", searchID);
}

// Function to save items to a custom .snet file.
void saveItemsToFile(struct Item *items, int itemCount, const char *fileName) {
    FILE *file = fopen(fileName, "w");
    if (file == NULL) {
        fprintf(stderr, "ERROR: -(Unable to open file for writing: %s)-\n", fileName);
        return;
    }

    for (int i = 0; i < itemCount; i++) {
        fprintf(file, "%d\t%s\t%s\t%s\t%s\n", items[i].id, items[i].name, items[i].model, items[i].config, items[i].hash);
    }

    fclose(file);
    printf("SUCCESS: -(Items have been saved to %s)-\n", fileName);
}

int main() {
    // Specify the custom directory name
    const char *customDirectoryName = "Documents/Projects/bcs1_c_l_hello_world_1";

    // Creates a custom directory in the user's Documents folder.
    createCustomDirectory(customDirectoryName);

    // Pointer to store items.
    struct Item *items = NULL;

    // Counter for the number of items.
    int itemCount = 0;

    int choice;

    // To store the filename for saving items.
    char fileName[110];

    do {
        displayMenu();
        printf("Enter choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addItem(&items, &itemCount);
                break;
            case 2:
                viewItems(items, itemCount);
                break;
            case 3:
                printf("Enter ID to search: ");
                int searchID;
                scanf("%d", &searchID);
                searchItemByID(items, itemCount, searchID);
                break;
            case 4:
                printf("Enter file name to save (.snet extension will be added): ");
                scanf("%s", fileName);
                strcat(fileName, ".snet");
                saveItemsToFile(items, itemCount, fileName);
                break;
            case 5:
                printf("Exiting program...\n");
                break;
            default:
                printf("ERROR: -(Invalid choice)-\n");
                break;
        }
    } while (choice != 5);

    free(items); // Free dynamically allocated memory before exiting.

    return 0;
}