/*
Program Name: Inventory
Process: Write a program that dynamically manages an inventory system for a roleplaying
         game. The inventory should be a dynamic array of the following items {“Sword”,
         “Health”, “Shield”, “Food”}. Each item in this array should have a quantity
         quantity. The quantity should indicate how many of such items exist, for example
         the inventory could have 3 swords, 2 healths, 1 shield and 0 food. The array is
         dynamic since there is no requirement that all items have to be present in the array.
         Starting empty, allow your user to pick the following options:
        ● Add an item to the inventory and continue adding till you have at least one
          of each item.
        ● Display the inventory
        ● Use an item (reducing the quantity by 1)
        ● Delete an item from the inventory when the quantity is 0
        Hint: Use new and delete operators to allocate and deallocate memory for the
        array. Ensure that you handle the memory properly to avoid any memory leaks.
Function Input/Parameters: ???
Function Output/Parameters: ???
Function Output/Returned: ???
Device Input/Device: ???
Device Output/Monitor: ???
Dependencies: ???
*/

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <vector>
#include <random>
#include <algorithm>
#include <time.h>

using namespace std;

typedef enum
{
    QUIT_INVENTORY = -1,
    START_INVENTORY_MANAGEMENT,
    KEEP_INVENTORY_MANAGING,
    DISPLAY_INVENTORY
} MENU_OPTIONS;

// class definitions
class Inventory
{
private:
    vector<string> inv;

public:
    Inventory()
    {
        // default constructor
    }
    ~Inventory()
    {
        // default destructor
    }
    // accessor functions
    // need a find function (use vector find?)
    int findItem(string itemFind)
    {
        // use the find function, then compare each raw value
        auto vecIterator = find(inv.begin(), inv.end(), itemFind);
        if(vecIterator != inv.end())
        {
            // return the index if found
            return vecIterator - inv.begin();
        }
        // otherwise, return 'not found'
        return -1;
    }
    // need a display function, iterate and print each?
    void displayInventory()
    {
        // print out the entire inventory using a for loop.
        int inventorySize = inv.size();
        cout << "Inventory Items:" << endl;
        for(int vecIterator = 0; vecIterator < inventorySize - 1; vecIterator++)
        {
            cout << "\tItem " << vecIterator + 1 << ": " << inv[vecIterator] << endl;
        }
        cout << endl;
    }
    // mutator functions
    // need a use function (finds and removes the item)
    void useItem()
    {
        // ask user which item they want to use.
        int pickedItem;
        bool validItem = false;
        string itemToFind;
        int foundItemIndex = 0;
        // ask user which item they want to add.
        cout << "Please pick an item to add to the inventory: " << endl;
        cout << "\t1: Sword" << endl;
        cout << "\t2: Health" << endl;
        cout << "\t3: Shield" << endl;
        cout << "\t4: Food" << endl;
        cout << "Item Number: ";
        while(!validItem)
        {
            cin >> pickedItem;
            cin.ignore();
            if(pickedItem == 1)
            {
                validItem = true;
                itemToFind = "Sword";
            }
            else if(pickedItem == 2)
            {
                validItem = true;
                itemToFind = "Health";
            }
            else if(pickedItem == 3)
            {
                validItem = true;
                itemToFind = "Shield";
            }
            else if(pickedItem == 4)
            {
                validItem = true;
                itemToFind = "Food";
            }
            else
            {
                cout << "Invalid Item. Please enter again:" << endl;
                cout << "Item Number: ";
            }
        }
        cout << endl;
        // use the itemToFind with the find function
        foundItemIndex = findItem(itemToFind);
        // remove said item at index if found.
        if(foundItemIndex > -1)
        {
            // remove item at index
            inv.erase(inv.begin() + foundItemIndex);
        }
    }
    // need an add function (prompts user to add an item, get num input to ask)
    void addItem()
    {
        int pickedItem;
        bool validItem = false;
        // ask user which item they want to add.
        cout << "Please pick an item to add to the inventory: " << endl;
        cout << "\t1: Sword" << endl;
        cout << "\t2: Health" << endl;
        cout << "\t3: Shield" << endl;
        cout << "\t4: Food" << endl;
        cout << "Item Number: ";
        while(!validItem)
        {
            cin >> pickedItem;
            cin.ignore();
            if(pickedItem == 1)
            {
                validItem = true;
                inv.push_back("Sword");
            }
            else if(pickedItem == 2)
            {
                validItem = true;
                inv.push_back("Health");
            }
            else if(pickedItem == 3)
            {
                validItem = true;
                inv.push_back("Shield");
            }
            else if(pickedItem == 4)
            {
                validItem = true;
                inv.push_back("Food");
            }
            else
            {
                cout << "Invalid Item. Please enter again:" << endl;
                cout << "Item Number: ";
            }
        }
        cout << endl;
    }
};

// function definitions

// main function
int main()
{
    int menuSelInt = 4;
    int iterateCount = 0;
    MENU_OPTIONS menuFunction = START_INVENTORY_MANAGEMENT;
    Inventory currentInventory;
    // menu functionality
    do
    {
        // print out the menu with all of the options available.
        printf("Inventory Manager Program\n");
        printf("  Menu Options:\n");
        printf("    1: Add Item to Inventory\n");
        printf("    2: Display Items in Inventory\n");
        printf("    3: Use Item in Inventory\n");
        printf("    4: Quit Inventory Manager\n");
        printf("Select a menu option: ");
        // ask for the menu selection
        scanf("%d", &menuSelInt);
        // print a new line
        printf("\n");
        if(menuSelInt == 1)
        {
            if(iterateCount == 0)
            {
                menuFunction = START_INVENTORY_MANAGEMENT;
            }
            else
            {
                menuFunction = KEEP_INVENTORY_MANAGING;
            }
            iterateCount = iterateCount + 1;
        }
        else if(menuSelInt == 2)
        {
            // use the display function defined, increase the iterateCount
            menuFunction = DISPLAY_INVENTORY;
            iterateCount = iterateCount + 1;
            currentInventory.displayInventory();
        }
        else if(menuSelInt == 3)
        {
            // use the 'useItem' function defined. increase the iterateCount, 
            // use the DISPLAY_INVENTORY code since I can't be bothered to make another one.
            menuFunction = DISPLAY_INVENTORY;
            iterateCount = iterateCount + 1;
            currentInventory.useItem();
        }
        else
        {
            // decide to quit the inventory manager if all else fails.
            menuFunction = QUIT_INVENTORY;
        }
        switch (menuFunction)
        {
        case START_INVENTORY_MANAGEMENT:
            cout << "Starting Inventory Management." << endl;
            // add item to inventory.
            currentInventory.addItem();
            break;
        case KEEP_INVENTORY_MANAGING:
            cout << "Continuing Inventory Management." << endl;
            // add item to inventory.
            currentInventory.addItem();
            break;

        default:
            break;
        }
    } while (menuFunction != QUIT_INVENTORY);
    
    return 0;
}