CS136 Lab1 [7]

//Lab 1 Wilson, Drayden T Th

#include <iostream>
#include <fstream>
#include <algorithm>
#include <string>

using namespace std;

const int INV_ARR_MAX = 15;

struct productInfo
{
    string ID, name;
    int quantity;
    float price;
};

typedef productInfo product;

int FillInventory(product *list[]);
void DuplicateArray(product *list1[], product *list2[], int listSize);
void PrintList(product *list[], int listSize);
int CompareItems(const void *item1, const void *item2);
void TestSearchItem(product *list[], string testItem, string searchItem, int index);
void SearchList(product *list[], int listSize, string searchItem);
void PrintListInfo(product *list[], int listSize);
void DeallocateMemory(product *list[], int listSize);
void RuntimeError(const string errorMessage);

int main()
{
    product *pInventoryUnsorted[INV_ARR_MAX] = { nullptr },
        *pInventorySorted[INV_ARR_MAX] = { nullptr };
    int productCount, userMenuSelection = 0;
    string searchItem;

    productCount = FillInventory(pInventoryUnsorted);

    cout << pInventoryUnsorted[0]->ID << ' ' << pInventoryUnsorted[0]->name << ' '
        << pInventoryUnsorted[0]->quantity << ' ' << pInventoryUnsorted[0]->price << endl;
    //////////////////// why does this work in FillInventory() but not here in main?

    DuplicateArray(pInventoryUnsorted, pInventorySorted, productCount);

    cout << "[1] Display the inventory unsorted.\n"
        << "[2] Display the inventory in ascending order by a field.\n"
        << "[3] Search for an item by ID or name.\n"
        << "[4] Display the unique item count, total worth,"
        << "and total item count of the inventory.\n"
        << "[5] Exit.\n";

    do
    {
        if (userMenuSelection)
        {
            cout << "\nSelect another option.: ";
        }
        else
        {
            cout << "\nSelect an option by entering its corresponding number: ";
        }

        cin >> userMenuSelection;

        switch (userMenuSelection)
        {
        case 1:
            PrintList(pInventoryUnsorted, productCount);
            break;
        case 2:
            qsort(pInventorySorted, productCount, sizeof(product*), CompareItems);
            PrintList(pInventorySorted, productCount);
            break;
        case 3:
            cout << "Input an ID or name to search by: ";
            cin >> searchItem; //assuming input is all numbers or all letters

            transform(searchItem.begin(), searchItem.end(), searchItem.begin(), ::toupper);

            SearchList(pInventoryUnsorted, productCount, searchItem);
            break;
        case 4:
            PrintListInfo(pInventoryUnsorted, productCount);
            break;
        case 5:
            cout << "Exiting program.\n";
            break;
        default:
            cout << "Invalid menu option selected.\n";

            userMenuSelection = 1; //avoids repeating initial instructions
            break;
        }
    } while (userMenuSelection != 5);

    DeallocateMemory(pInventoryUnsorted, productCount);

    system("pause");
    return 0;
}

//Populates an array of pointers to structs with data from file
//pre: list and inFile exist
//post: inFile is closed, list contains items from inFile, number of items is returned
int FillInventory(product *list[])
{
    ifstream inFile;
    product temp;
    int i; //counter

    inFile.open("input.txt");

    if (!inFile)
    {
        RuntimeError("Failed to open input file.");
    }
    else
    {
        cout << "Input file read successfully.";
    }


    for (i = 0; inFile >> temp.ID && i < INV_ARR_MAX; ++i)
    {
        inFile >> temp.name >> temp.quantity >> temp.price;

        transform((temp.name).begin(), (temp.name).end(), (temp.name).begin(), ::toupper);

        if (temp.quantity < 0 || temp.price < 0.01)
        {
            printf("Invalid entry detected. Discarding \"%s\" entry.\n", temp.name);
        }
        else
        {
            try
            {
                list[i] = (product *)malloc(sizeof(product));
            }
            catch (bad_alloc exception)
            {
                RuntimeError("Insufficient memory available.");
            }

            list[i] = &temp;

            cout << list[i]->ID << ' ' << list[i]->name << ' ' << list[i]->quantity << ' ' << list[i]->price << endl;//////////////
        }
    }

    inFile.close();

    if (i == 0)
    {
        RuntimeError("Input file is empty.");
    }
    else if (!inFile.eof())
    {
        RuntimeError("Excess entries detected.");
    }

    return i;
}

//Assigns one array of pointers to structs to another
//pre: list1 is populated and listSize is defined
//post: list2 is identical to list1
void DuplicateArray(product *list1[], product *list2[], int listSize)
{
    for (int i = 0; i < listSize; ++i)
    {
        list2[i] = list1[i];
    }
}

//Prints all members held within an array
//pre: list is populated and listSize is defined
//post: all members are printed
void PrintList(product *list[], int listSize)
{
    for (int i = 0; i < listSize; ++i)
    {
        cout << list[i]->ID << ' '
            << list[i]->name << ' '
            << list[i]->quantity << ' '
            << list[i]->price << endl;
    }
}

//Compares two members from different structs from an array of pointers to structs
//pre: the source array and all structs within are defined
//post: the difference between the two struct members is returned
int CompareItems(const void *item1, const void *item2)
{
    product *pItem1 = *(product**)item1;
    product *pItem2 = *(product**)item2;
    int sortChoice;

    cout << "Select an option to sort the list by "    //sortChoice prompt and input must be here
        << "[1]ID, [2]name, [3]quantity, [4]price: ";  //because of nature of qsort

    do
    {
        cin >> sortChoice;

        switch (sortChoice)
        {
        case 1:
            return pItem1->ID.compare(pItem2->ID);
        case 2:
            return pItem1->name.compare(pItem2->name);
        case 3:
            return pItem1->quantity - pItem2->quantity;
        case 4:
            return pItem1->price - pItem2->price;
        default:
            cout << "Invalid option selected. Try Again: ";
            break;
        }
    } while (sortChoice < 1 || sortChoice > 4);
}

//Tests if a given item is equivalent to a given search term
//pre: all variables are defined
//post: item info is printed if found, fail message printed otherwise
void TestSearchItem(product *list[], string testItem, string searchItem, int index)
{
    if (testItem == searchItem)
    {
        cout << list[index]->ID << ' '
            << list[index]->name << ' '
            << list[index]->quantity << ' '
            << list[index]->price << endl;
    }
    else
    {
        cout << "Item not found.\n";
    }
}

//Seaches a list for a given item by ID or name then prints that item's info is found
//pre: list is populated, listSize is defined and searchItem is defined
//post: the sought after item's info is printed if found
void SearchList(product *list[], int listSize, string searchItem)
{
    for (int i = 0; i < listSize; ++i)
    {
        if (isdigit(searchItem[0])) //search item is an ID
        {
            TestSearchItem(list, list[i]->ID, searchItem, i);
        }
        else //search item is a name
        {
            TestSearchItem(list, list[i]->name, searchItem, i);
        }

    }
}

//Calculates and prints the number of unique elements, total al value and total size of an inventory
//pre: list is populated and listSize is defined
//post: info has been printed
void PrintListInfo(product *list[], int listSize)
{
    static float inventoryValue = 0;
    static int inventorySize = 0;
    bool infoCalculated = 0;

    for (int i = 0; i < listSize && !infoCalculated; ++i)
    {
        inventoryValue += list[i]->price;
        inventorySize += list[i]->quantity;
    }

    infoCalculated = 1;

    cout << "Unique Items: " << listSize
        << "\nInventory Value: " << inventoryValue
        << "\nInventory Size: " << inventorySize << endl;
}

//Frees memory of an array's elements
//pre: list is populated and listSize is defined
//post: list's elements no longer have memory allocated to them
void DeallocateMemory(product *list[], int listSize)
{
    for (int i = 0; i < listSize; ++i)
    {
        free((void *)list[i]);
    }
}

//Outputs a unique error message and ends the program
//pre: N/A
//post: error message has been output and program has ended
void RuntimeError(const string errorMessage)
{
    cout << "Error: " << errorMessage << " Exiting program.\n\n";
    system("pause");
    exit(1);
}

//issue with product count after fill
//switch to bubble sort
//program crashes when trying to exit from menu
//store price as float?

/*
997196478 StroLLer 25 134.78
168484964 umBRElLA 39 14.74
168746844 Coat 17 36.54
498749896 baSkEt 29 7.23
836749194 tOwEl 52 5.89
*/