package algs24;
import stdlib.*;
import algs12.Transaction;
import algs13.Stack;
/* ***********************************************************************
 *  Compilation:  javac TopM.java
 *  Execution:    java TopM M < input.txt
 *  Dependencies: MinPQ.java Transaction.java StdIn.java StdOut.java
 *  Data files:   http://algs4.cs.princeton.edu/24pq/tinyBatch.txt
 *
 *  Given an integer M from the command line and an input stream where
 *  each line contains a String and a long value, this MinPQ client
 *  prints the M lines whose numbers are the highest.
 *
 *  % java TopM 5 < tinyBatch.txt
 *  Thompson    2/27/2000  4747.08
 *  vonNeumann  2/12/1994  4732.35
 *  vonNeumann  1/11/1999  4409.74
 *  Hoare       8/18/1992  4381.21
 *  vonNeumann  3/26/2002  4121.85
 *
 *************************************************************************/

public class TopM {

  // Print the top M lines in the input stream.
  public static void main(String[] args) {
    args = new String[] { "5" };
    StdIn.fromFile ("data/tinyBatch.txt");

    int M = Integer.parseInt(args[0]);
    MinPQ<Transaction> pq = new MinPQ<>(M+1);

    while (StdIn.hasNextLine()) {
      // Create an entry from the next line and put on the PQ.
      String line = StdIn.readLine();
      Transaction transaction = new Transaction(line);
      pq.insert(transaction);

      // remove minimum if M+1 entries on the PQ
      if (pq.size() > M)
        pq.delMin();
    }   // top M entries are on the PQ

    // print entries on PQ in reverse order
    Stack<Transaction> stack = new Stack<>();
    for (Transaction transaction : pq)
      stack.push(transaction);
    for (Transaction transaction : stack)
      StdOut.println(transaction);
  }
}