//Jonathan Kovach
//ITK 177, Secton 7, Dr. Vila
//Program 8, Reading and Writing an object array

import java.io.*;//Import throws exceptions
import java.util.Scanner;//Imports Scanner class
import java.text.NumberFormat;;//Imports numberformat


public class Inventory { //Creates Inventory class
	private Item[] items;; //Creates a single object array
	
public Inventory(String fileName) throws FileNotFoundException { //Creates Inventory constructor and accepts fileName as argument
	Scanner scan = new Scanner(new File(fileName)); //Initializes keyboard Scanner as scan
	items = new Item[scan.nextInt()]; //initializes the length of the items array
	for(int i = 0; i < items.length; i++){ //for loop to cycle through all of the items arrays
		items[i] = new Item(); //initializes an item class for each items array varible 
		items[i].setQuantity(scan.nextInt()); //sets quantity 
		items[i].setCost(scan.nextDouble()); //sets cost
		items[i].setName(scan.nextLine()); //sets name
		}
}	

public void increase(int number, int incr){ // creates an increase method and accepts the items number and the incriment number to the quantity
	items[number].setQuantity(items[number].getQuantity() + incr);
}

public void decrease(int number, int decre){ // creates a decrease method identical to the increase except decriments the number to the quantity
	items[number].setQuantity(items[number].getQuantity() - decre);
}

public void displayInventory() { // creates a displayInventory method that displays all information of inventory
	NumberFormat format = NumberFormat.getCurrencyInstance(); //initializes the numberformat as format
	int totalNum = 0; //initializes a total number variable to totalNum and sets to 0
	double totalCost = 0; //initializes a total cost varible to totalCost and sets to 0
		System.out.println("\t\tInventory Report");
		System.out.println("\nPart#\tQOH\tCost\tTotal Cost\t Name"); //proper line formatting
		
	for(int i = 0; i < items.length; i++){ //for loop to access all data in the items arrays
		totalNum = items[i].getQuantity() + totalNum; //incriments totalNum with the quantity of the items
		totalCost =(items[i].getCost() * items[i].getQuantity()) + totalCost; //imcrements totalCost by multiplying the items cost by quantity and adds to totalCost
		System.out.println(i + "\t" + items[i].getQuantity() + "\t" + items[i].getCost() + "\t" + format.format((items[i].getCost()) * items[i].getQuantity()) + "\t\t" + items[i].getName());
		 //proper line formatting and display of information
	}
	
		System.out.println("\t______\t\t______"); //Line Formatting
		System.out.println("\t" + totalNum + "\t\t" + format.format(totalCost)); //formats the total cost and line formatted correctly
		System.out.println(); //extra space
		System.out.println(); //estra space
}

public void displayHighest() { //creates method for displaying the highest quantity
	int highest = 0; //intitializes highest to 0
		System.out.println("The Part with the Highest QOH is:");
		
for(int i = 0; i < items.length; i++){
	if(items[i].getQuantity() > highest) // simple if statement to replace highest if it less than the quantity of a certain item
		highest = items[i].getQuantity();
}

for(int i = 0; i < items.length; i++){ // another for statement to display the highest items data
	NumberFormat format = NumberFormat.getCurrencyInstance();
	if(highest == items[i].getQuantity())
		System.out.println(i + "\t" + items[i].getQuantity() + "\t" + items[i].getCost() + "\t" + format.format((items[i].getCost() * items[i].getQuantity())) + "\t" + items[i].getName());
}
		System.out.println(); //extra space
		System.out.println(); //extra space
}

public void reordering() { // creates a method to display the items number and name if the quantity is equal to 0
		System.out.println("Parts that Need Reordering");
	for(int i = 0; i < items.length; i++){
		if(items[i].getQuantity() == 0)
			System.out.println(i + "\t" + items[i].getName());
	}
}

public void writeInventory(String fileName) throws IOException { //creates a method to write data to a new file
	FileWriter fwriter = new FileWriter(fileName); //initializes the file writer to accept fileName as the file name
	PrintWriter outputFile = new PrintWriter(fwriter); //initializes the printWriter to write the data to the file writer
		outputFile.println(items.length); // writes the length of the array (OUT SIDE OF LOOP)
		
			for(int i = 0; i< items.length; i++){ // for loop to write in ONE line the quantity, cost, and name with a space between each
				outputFile.print(items[i].getQuantity() + " ");
				outputFile.print(items[i].getCost() + " ");
				outputFile.print(items[i].getName() + " ");
				outputFile.println();
	}
	outputFile.close(); // close print writer
}





}