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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#define MAX_ITEMS 100
#define MAX_STRING_LENGTH 100
#define MAX_CUSTOM_DIR_PATH (MAX_STRING_LENGTH * 3) // Increased size to accommodate longer paths

struct Item {
    int id;
    char name[MAX_STRING_LENGTH];
    char model[MAX_STRING_LENGTH];
    char config[MAX_STRING_LENGTH];
    char hash[MAX_STRING_LENGTH];
};

void createCustomDirectory(const char *directoryName) {
    char documentsPath[MAX_STRING_LENGTH * 2];
    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[MAX_CUSTOM_DIR_PATH];
    snprintf(customDirPath, MAX_CUSTOM_DIR_PATH, "%s/%s", documentsPath, directoryName);

    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 = '/';
    }

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

void displayMenu() {
    printf("----------------------Menu----------------------\n");
    printf("1. Add Item\n");
    printf("2. View Items\n");
    printf("3. Search Item by ID\n");
    printf("4. Load Items from File\n");
    printf("5. Save Items to .snet File\n");
    printf("6. Exit Program\n");
    printf("------------------------------------------------\n");
    printf("\n");
}

void addItem(struct Item *items, int *itemCount) {
    if (*itemCount >= MAX_ITEMS) {
        printf("ERROR: Maximum item count reached.\n");
        return;
    }

    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);

    items[*itemCount] = item;
    (*itemCount)++;
    printf("SUCCESS: Item added.\n");
}

int compareItems(const void *a, const void *b) {
    return ((struct Item *)a)->id - ((struct Item *)b)->id;
}

void viewItems(const struct Item *items, int itemCount) {
    if (itemCount == 0) {
        printf("ERROR: No items to display\n");
        return;
    }

    struct Item sortedItems[itemCount];
    memcpy(sortedItems, items, itemCount * sizeof(struct Item));
    qsort(sortedItems, 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", sortedItems[i].id, sortedItems[i].name, sortedItems[i].model,
               sortedItems[i].config, sortedItems[i].hash);
    }
}

void searchItemByID(const 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);
}

void saveItemsToFile(const 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);
}

// Function to append items from a .snet file to the existing array.
void loadItemsFromFile(struct Item *items, int *itemCount, const char *fileName) {
    FILE *file = fopen(fileName, "r");
    if (file == NULL) {
        fprintf(stderr, "ERROR: Unable to open file for reading: %s\n", fileName);
        return;
    }

    int loadedItemCount = 0; // Track the number of items loaded from the file.

    while (!feof(file) && loadedItemCount < MAX_ITEMS) {
        struct Item item;

        // Read item data from file.
        if (fscanf(file, "%d %99s %99s %99s %99s", &item.id, item.name, item.model, item.config, item.hash) == 5) {
            if (*itemCount < MAX_ITEMS) {
                items[*itemCount] = item; // Append the loaded item to the existing items array.
                (*itemCount)++;
                loadedItemCount++;
            } else {
                printf("WARNING: Maximum item count reached. Loaded items beyond the limit will be discarded.\n");
                break;
            }
        }
    }

    fclose(file);
    printf("SUCCESS: %d items have been loaded from %s\n", loadedItemCount, fileName);
}

int main() {
    const char *customDirectoryName = "Documents/Projects/bcs1_c_l_hello_world_1";
    createCustomDirectory(customDirectoryName);

    struct Item items[MAX_ITEMS];
    int itemCount = 0;
    int choice;
    char fileName[MAX_STRING_LENGTH + 5]; // +5 for ".snet"

    // Prompt the user for the .snet file to load at the start.
    printf("Enter .snet file name to load (or press Enter to skip): ");
    if (fgets(fileName, sizeof(fileName), stdin)) {
        fileName[strcspn(fileName, "\n")] = '\0'; // Remove trailing newline if present

        // Load items from the specified .snet file.
        loadItemsFromFile(items, &itemCount, fileName);
    }

    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 load: ");
                scanf("%s", fileName);
                loadItemsFromFile(items, &itemCount, fileName);
                break;
            case 5:
                printf("Enter file name to save (.snet extension will be added): ");
                scanf("%s", fileName);
                strcat(fileName, ".snet");
                saveItemsToFile(items, itemCount, fileName);
                break;
            case 6:
                printf("Exiting program...\n");
                break;
            default:
                printf("ERROR: Invalid choice\n");
                break;
        }
    } while (choice != 6); // Keep the menu running until choice is 6 (Exit).

    return 0; // Properly exit the program.
}