//--------------------------------------------------------------------
// CS215-401 PROJECT 2
//--------------------------------------------------------------------
// Author: Ash Rule
// Date: 10/11/19
// Description: 2nd project using arrays and functions.
//--------------------------------------------------------------------

#include <iostream>
#include <iomanip>
#include <string>
#include <ctype.h>
#include <fstream>

using namespace std;

const int READ_ERROR = -1;
const int MAX_INV_ITEMS = 10;
const int MAX_ORDERS = 7;
const int MAX_ORDER_ITEMS = 5;
//int numberOfInvItems = 0;
//int lastOrderNum = 0;
//int totalOrder = 0;
//int selectItemNum;
//int numOfOrders = 0;
//int numBasket = 0;

ifstream fin;
ofstream fout;

	// describes a single item in the inventory, and on an order
	struct item {
		string prodCode;		// product code: length 12, no spaces
		string description;		// product description: max length 28, has spaces
		double price = 0;			// price of the product, max 999.99
	};

	// describes a customer order or "basket"
	struct order {
		long   orderNumber = 0;		// unique order number for this order
		string custName;		// customer name
		double totalPrice = 0;		// price of all items purchased
		item items[MAX_ORDER_ITEMS];	// list of items purchased
		int numItems = 0;			// number of items purchased
	};

	//----------------------------------------------------------------------------
	//                                  readInventory
	//----------------------------------------------------------------------------
	// Modifies: inventory list (sets numberOfItems to -1 on READ ERROR)
	//           lastOrderNum
	// Reads inventory data from a file into an array of inventory items
	//----------------------------------------------------------------------------
	void readInventory(item inv[], int& numberOfInvItems, int& lastOrderNum) {
		ifstream f;

		// open the inventory file
		f.open("inventory.txt");
		if (f.fail()) {
			cout << "readFile:: error opening inventory.txt\n";
			numberOfInvItems = READ_ERROR;
			return;
		}

		// read number of items from first line
		f >> numberOfInvItems >> lastOrderNum;

		// for each item, read the data for the item
		for (int i = 0; i < numberOfInvItems; i++) {
			f >> inv[i].prodCode >> inv[i].price;
			f.ignore(); // finished reading integer, getline() on string is next
			getline(f, inv[i].description);
		}
		f.close();
	} // readInventory()



	/*bool isValidOption(char option, string validOptions) {
		for (int i = 0; i < validOptions.length(); i++)
		return true;
		*/


	bool isValidOption(char option, string validOptions) {
			for (int i = 0; i < validOptions.length(); i++)
				if (validOptions[i] == option) {
					return true;
				}
			return false;
		}


	char getMainOption() {
		string userInput, validOptions = "IOLX";
		char option;


		cout << "+--------------------------------------------------+" << endl;
		cout << "+                    AMZN.COM                      +" << endl;
		cout << "+                  by Ash Rule                     +" << endl;
		cout << "+--------------------------------------------------+" << endl;
		cout << "I - List our Inventory" << endl;
		cout << "O - Make an order" << endl;
		cout << "L - List all Orders made" << endl;
		cout << "X - Exit" << endl;

		cout << "Enter an option: ";
		cin >> userInput;
		option = toupper(userInput[0]);

		while (!isValidOption(option, validOptions)) {
			cout << "Invalid option, enter I, O, L, or X!" << endl;
			cout << "Enter an option: ";
			cin >> userInput;
			option = toupper(userInput[0]);
		}

		return option;
	}

	void displayList(item inventory[], int numberOfInvItems) {
		for (int i = 0; i < numberOfInvItems; i++)
			cout << fixed << setw(3) << right << i << "  " << setw(12) << left << inventory[i].prodCode << "  $" << setw(6) << right << setprecision(2) << inventory[i].price << "  " << inventory[i].description << endl;

	}

	void displayInventory(item inventory[], int numberOfInvItems) {
		cout << "+--------------------------------------------------+" << endl;
		cout << "+                      Products                    +" << endl;
		cout << "+--------------------------------------------------+" << endl;
		cout << " #   PRODUCT CODE   PRICE   PRODUCT DESCRIPTION     " << endl;
		cout << "---  ------------  -------  ------------------------" << endl;

		displayList(inventory, numberOfInvItems);

		cout << "Number of items in inventory: " << numberOfInvItems << endl << endl;

	}

	void displayOrder(order basket) {
			cout << "ORDER: " << basket.orderNumber << "   " << basket.custName << endl;
			displayList(basket.items, basket.numItems);
			cout << "Total              $" << basket.totalPrice << endl;
			//cout << "Total Number of Orders = " << basket[numBasket] << endl << endl;
			//cout << "Total number of orders: " << basket.numItems << endl;
	}

	void startOrder(order basket[], int &numBasket, int &lastOrderNum) {
		lastOrderNum++;
		basket[numBasket].totalPrice = 0;
		basket[numBasket].numItems = 0;
		basket[numBasket].orderNumber = lastOrderNum;
		cout << "Order Number:        " << lastOrderNum << endl;
		cout << "Enter customer name: ";
		if (cin.peek() == '\n') cin.ignore();
		getline(cin, basket[numBasket].custName);

	}


	bool orderItem(item inventory[], order &basket, int numInvItems) {
		int selectItemNum;
		cout << "Enter item number (-1 to end): ";
		cin >> selectItemNum;

		while (selectItemNum >= numInvItems || selectItemNum < -1) {
			cout << "Invalid entry. Enter number -1 to " << numInvItems - 1 << endl;
			cout << "Enter item number (-1 to end): ";
			cin >> selectItemNum;
		}

		if (selectItemNum < numInvItems && selectItemNum > -1) {
			basket.items[basket.numItems].prodCode = inventory[selectItemNum].prodCode;
			basket.items[basket.numItems].description = inventory[selectItemNum].description;
			basket.items[basket.numItems].price = inventory[selectItemNum].price;
			basket.totalPrice = basket.totalPrice += basket.items[basket.numItems].price;

			cout << inventory[selectItemNum].description << " added to your basket. Current total is $ " << basket.totalPrice << endl;
			basket.numItems++;


			//return false;
		}

		else if (selectItemNum == -1) {
			cout << "Thank you for your order!" << endl;
			displayOrder(basket);

			system("pause");
			return true;
		}


	}


	void makeOrder(item inventory[], order basket[], int numberOfInvItems, int &numOfOrders, int &lastOrderNum){

		bool check = false;
		if (numOfOrders < MAX_ORDERS) {
			startOrder(basket, numOfOrders, lastOrderNum);
			displayInventory(inventory, numberOfInvItems);

			while (basket[numOfOrders].numItems < MAX_ORDER_ITEMS && check != true){
				check = orderItem(inventory, basket[numOfOrders], numberOfInvItems);

			}

			numOfOrders++;
		}

		else {
			cout << "Sorry, we can not take more orders today." << endl;
		}

	}


	void listOrders(order basket[], int& numBasket) {
		cout << "+--------------------------------------------------+" << endl;
		cout << "+                     Orders                       +" << endl;
		cout << "+--------------------------------------------------+" << endl;

		for (int i = 0; i < numBasket; i++) {
			displayOrder(basket[i]);
		}
		cout << endl;
		cout << "Total Number of Orders = " << numBasket << endl << endl;


	}

	/*void writeOrders(basket[]) {

		fin.open("orders.txt");
		if (fin.fail()) {
			cout << "File open failed." << endl;

			system("pause");
			return;
		}

		cout << totalOrder << endl;
		for (int i = 0; i < totalOrder; i++) {
			cout << basket[i].orderNumber <<  basket[i].custName;

		}

		fin.close();
	}*/




	int main(){
	order basket[MAX_ORDERS];
	item inventory[MAX_INV_ITEMS];
	int numberOfInvItems = 0;
	int lastOrderNum;    //moved some global variables here
	int numOfOrders = 0;
	int numBasket = 0;

	readInventory(inventory, numberOfInvItems, lastOrderNum);

	char option = getMainOption();


	while (option != 'X') {

		if (option == 'I') {
			displayInventory(inventory, numberOfInvItems); // added numberOfInvItems

		}
		else if (option == 'O') {
			makeOrder(inventory, basket, numberOfInvItems, numOfOrders, lastOrderNum);

		}
		else if (option == 'L') {
			listOrders(basket, numOfOrders);
		}
		option = getMainOption();
	}

		cout << "This is where the orders should be printed out to an output file." << endl;




	system("pause");
	return 0;
}