public class Lab7 
{

  // Methods to be completed for Lab 7

  public static void countEven()
  {
    int[] data = getData();
    int numEvens = 0;
    for (int i = 0; i < 10; i++) 
    {
      if (data[i] % 2 == 0)
      {
        numEvens = numEvens + 1;
      }
    }
    System.out.println("The number of evens is " + numEvens);
  }

  public static void countAboveAverage()
  {
    int[] data = getData();
    int numAboveAvg = 0;
    double average = getAverage(data); 
    System.out.println("The average is " + average);
    for (int i = 0; i < 10; i++) 
    {
      if (data[i] > average)
      {
        numAboveAvg = numAboveAvg + 1;
      }
    }
    System.out.println("The number above the average is " + numAboveAvg);
  }

  public static int[] getData()
  {
    int[] data = new int[10];
    for (int i = 0; i < 10; i++)
    {
      System.out.println("Input a data value: ");
      String userInput = Util.input();
      data[i] = Integer.parseInt(userInput);
    }
    return data;
  }
  
  public static double getAverage(int[] data)
  {
     int sum = 0;
     for (int i = 0; i < 10; i++)
     {
       sum = sum + data[i];
     }
     return sum/10.0;
  }
  
  public static void plotFunction()
  {
    Draw.window(500,500);
    Draw.setColor(0,0,255);
    int[] f = new int[500];
    for (int x = 0; x < 500; x++)
    {
      f[x] = x*x/200 - x + 200;
    }
    for (int x = 1; x < 500; x++)   // note that we start from 1, not 0
    {
      Draw.line(x-1, 500-f[x-1], x, 500-f[x]);
    }
  }

  public static void colorgram()
  {
    int[] data = getDataFromFile();
    // Determine window width
    int width = 0;
    int red;
    int green;
    int blue;
    int total;
    
    for (int i = 0; i < 8; i++)
    {
      width = width + data[i];
    }
    Draw.window(width, 200);
    Draw.setFill(true);
    // Draw each bar with the corresponding width and color
    total = 0;  // running total of previous bar widths
    for (int i = 0; i < 8; i++)
    {
      red = computeRed(i);
      green = computeGreen(i);
      blue = computeBlue(i);
      Draw.setColor(red, green, blue);
      Draw.rectangle(total, 0, data[i], 200);
      total = total + data[i];      
    }
  }
  
  public static int[] getDataFromFile()
  {
    int[] data = new int[8];
    for (int i = 0; i < 8; i++)
    {
      String userInput = Util.readLine("mydata.txt");
      data[i] = Integer.parseInt(userInput);
    }
    return data;
  }

  public static int computeRed(int i)
  {
      if (i / 4 == 0)
      {
        return 0;
      }
      else
      {
        return 255;
      }
  }
  
  public static int computeGreen(int i)
  {
      if ((i / 2) % 2 == 0)
      {
        return 0;
      }
      else 
      {
        return 255;
      }
  }
  
  public static int computeBlue(int i)
  {
      if (i % 2 == 0)
      {
        return 0;
      }
      else 
      {
        return 255;
      }
  }
    
}