import java.util.*;
import java.io.*;

public class Scheduler {
    //Address of File name relative to code. Replace with request for filename?
    String fileName = "datafiles/datafile1.txt";
    
    //Initialise Processes. Assumes max of 10.
    Process[] p = new Process[10];
    private int processCount = -1;

    //Initialise Array for Random numbers. Assumes max of 50.
    int[] randomNum = new int[50];
    int randomNumLength = -1;

    /**
     * Main. Runs the program
     */
    public static void main(String[] args){
        Scheduler system = new Scheduler();
        system.run();
    }

    /**
     * Run. Most of the program starts from here.
     */
    public void run()
    {
        readFile(fileName); //Read the file

        //Test Print
        System.out.println("Begin Process List:");
        for (int i = 0; i <= processCount; i++)
        {
            System.out.print("ID: ");
            System.out.println(p[i].getId());

            System.out.print("Arrive: ");
            System.out.println(p[i].getArrive());
            
            System.out.print("ExecSize: ");
            System.out.println(p[i].getExecSize());
            
            System.out.print("Tickets: ");
            System.out.println(p[i].getTickets());      
            
            System.out.println();      
        }
        System.out.println("End Process List.");

        System.out.println("Begin Random:");
        for (int i = 0; i <= randomNumLength; i++)
        {
            System.out.println(randomNum[i]);
        }
        System.out.println("End Random.");

    }

    /**
     * readFile. Reads the file given, creating processes as needed to save details.
     * @param fileNameInput address of the file to be read in.
     */
    public void readFile(String fileNameInput)
    {
        Scanner fileReader; //Scanner to read the file.
        File dataSet = new File(fileNameInput);
        
        
        //Try and open file. If it works, procede.
        try {
            fileReader = new Scanner(dataSet);
            System.out.println("File Opened.");

            //Progress through each line in the text file
            while(fileReader.hasNextLine()){
                String line = fileReader.nextLine();
                
                //If the line has "EOF" written, stop reading lines.
                if(line.equals("EOF"))
                {
                    System.out.println("End of File Reached");
                    break;
                }
                
                //If the Line starts with "ID:", create a new process
                if(line.startsWith("ID:"))
                {
                    //Create new proccess
                    processCount++; //Increment the number of processes.
                    p[processCount] = new Process();

                    p[processCount].setId(line.substring(4));   //Set the id of the proccess to whatever remains of the line after the "ID: "

                    //As we've read in the ID, we shall assume the following lines (until "END") are all part of the process definition.
                    while(fileReader.hasNextLine())
                    {
                        line = fileReader.nextLine();

                        if(line.equals("END"))
                        {
                            break;
                        }
                        
                        else if(line.startsWith("Arrive:"))
                        {   
                            p[processCount].setArrive(Integer.parseInt(line.substring(8))); 
                        }

                        else if(line.startsWith("ExecSize:"))
                        {   
                            
                            p[processCount].setSize(Integer.parseInt(line.substring(10))); 
                        }                        
                        
                        else if(line.startsWith("Tickets:"))
                        {   
                            p[processCount].setTickets(Integer.parseInt(line.substring(9))); 
                        }    

                        else 
                        {
                            //Delete process?
                        }
                    }
                }
                
                //If we read the line "BEGINRANDOM", we've started the random numbers section. Until the "ENDRANDOM" line,
                //we'll just keep reading in each number (and it is assumed each line is a single number) and adding it 
                //to the random number array.
                else if(line.equals("BEGINRANDOM"))
                {
                    while(fileReader.hasNextLine())
                    {
                        line = fileReader.nextLine();

                        if(line.equals("ENDRANDOM"))
                        {
                            break;
                        }
                        else
                        {
                            randomNumLength++;
                            randomNum[randomNumLength] = Integer.parseInt(line);
                        }
                    }
                }
            }
            fileReader.close();
        } 
        
        //If the file isn't found, throw a hissy fit.
        catch (FileNotFoundException e) {
            System.out.println("File not found.");
            //e.printStackTrace();  //Optional, shows more data.
        }
    }
}