#include "DrinkMachine.h" //necessary include to use the header file we made with all of its other details as well as link to main

//bool function which will create the array and its information stored by reading in the data
//from the file and putting it into their respective places
bool create(DrinkMachine &drinkMachine)
{
	ifstream file;
	file.open("drink_machine.txt"); //opens the file and verify it opens properly

	if (file)
	{
		file >> drinkMachine.dCurrent;
		for (unsigned int i = 0; i < drinkMachine.dCurrent; i++)
		{
			file >> drinkMachine.dItems[i].dName;
			file >> drinkMachine.dItems[i].dPrice; //for each current item, it reads in the Name Price and Stock
			file >> drinkMachine.dItems[i].dStock;
			drinkMachine.dItems[i].drinkId = (i + 1);
		}
		file.close(); //Close file
		return true;
	}
	else //Handle exception for file not opening
	{
		cout << "Unable to open file";
		return false;
	}
	drinkMachine.vNum = 1; //set the drinkmachine version number to 1
}

void destroy(DrinkMachine &drinkMachine) //Dump contnents of drink machine to file before exiting
{
	ofstream file;
	file.open("drink_machine.txt"); //open file

	if (file)
	{
		//file << "Writing this to a file.\n";
		file << drinkMachine.dCurrent << "\n";
		for (unsigned int i = 0; i < drinkMachine.dCurrent; i++)
		{
			file << drinkMachine.dItems[i].dName << "\t";
			file << drinkMachine.dItems[i].dPrice << " "; //output the items to the file
			file << drinkMachine.dItems[i].dStock << "\n";
		}
		file.close();
	}
	else
	{
		cout << "no file \n";
	}
	file.close();
}

DrinkItem & drink(DrinkMachine & drinkMachine, unsigned int drinkId)
{
	return drinkMachine.dItems[drinkId - 1];  //get item
}

unsigned int size(DrinkMachine & drinkMachine)
{
	return drinkMachine.dCurrent; //get size
}

bool available(DrinkMachine & drinkMachine, unsigned int drinkId)
{
	if (drinkMachine.dCurrent > drinkId)
	{
		return false;
	}
	else if (0 < drinkMachine.dItems[drinkId - 1].dStock)
	{
		return true;
	}
	return false;
}

double price(DrinkMachine & drinkMachine, unsigned int drinkId)
{
	if (drinkMachine.dCurrent > drinkId)
	{
		return drinkMachine.dItems[drinkId - 1].dPrice;
	}
	else
	{
		return -1.0;
	}
}

string name(DrinkMachine & drinkMachine, unsigned int drinkId)
{
	if (drinkMachine.dCurrent > drinkId)
	{
		return drinkMachine.dItems[drinkId - 1].dName;
	}
	else
	{
		return "Invalid";
	}
}

unsigned int quantity(DrinkMachine & drinkMachine, unsigned int drinkId)
{
	if (drinkMachine.dCurrent > drinkId)
	{
		return drinkMachine.dItems[drinkId - 1].dStock;
	}
	else
	{
		return 0;
	}
}

unsigned int sold(DrinkMachine & drinkMachine, unsigned int drinkId)
{
	if (drinkMachine.dCurrent > drinkId)
	{
		return drinkMachine.dItems[drinkId - 1].dPurchased;
	}
	else
	{
		return 0;
	}
}

bool purchase(DrinkMachine & drinkMachine, int unsigned drinkId, double amount, double & change)
{
	if (drinkMachine.dCurrent > drinkId)
	{
		if (drinkMachine.dItems[drinkId - 1].dStock > 0 && amount >= drinkMachine.dItems[drinkId - 1].dPrice)
		{
			drinkMachine.dItems[drinkId - 1].dPurchased++; //increment purchased and decrement
			drinkMachine.dItems[drinkId - 1].dStock--;	   //stock if item is purchased
		}
		if (drinkMachine.dItems[drinkId - 1].dPrice == amount)
		{
			change = 0.0; //Check if no change due
		}
		else
		{
			change = (amount - drinkMachine.dItems[drinkId - 1].dPrice); //get change due
		}
		return true;
	}
	else
	{
		return false;
	}
}

void dumpDrinkMachine(const DrinkMachine & drinkMachine) //dump contents of drink machine to the screen
{

	cout << "Drink Machine version " << drinkMachine.vNum << "\n" << "\n";
	cout << "Drink Id        \t" << "  Drink     " << " Cost  " << " Quantity     " << " Sold\n";
	for (unsigned int drinkid = 0; drinkid < drinkMachine.dCurrent; drinkid++)
	{
		cout << setw(8) << right << drinkMachine.dItems[drinkid].drinkId << "\t";
		cout << setw(15) << right << drinkMachine.dItems[drinkid].dName;
		cout << setw(10) << right << drinkMachine.dItems[drinkid].dPrice;
		cout << setw(11) << right << drinkMachine.dItems[drinkid].dStock;
		cout << setw(10) << right << drinkMachine.dItems[drinkid].dPurchased << endl;
	}
}