package ope.football;

import java.util.ArrayList;

/**
 * The class <CODE>Match</CODE> represents match results in a 
 * football match statistics program. A match is played
 * between teams from two clubs: a home club and an away club. 
 * Goals scored by players from either team can be added
 * to the match object with the method <CODE>addGoal</CODE>.
 * The class is expected to be used so that a match object is
 * initially creates as a real-life match starts and goals are
 * added incrementally as the match progresses.
 */
public class Match {

  private Club homeClub;                    // fixed value
  private ArrayList<Player> homeScorers;    // container: players who have scored for the home team
  private Club awayClub;                    // fixed value
  private ArrayList<Player> awayScorers;    // container: players who have scored for the away team

  
  /**
   * Constructs a match between teams of the given clubs,
   * with no goals scored (yet).
   * 
   * @param homeClub the club whose team plays at home in the match
   * @param awayClub the club whose team plays away in the match
   */
  public Match(Club homeClub, Club awayClub) {
  	this.homeClub = homeClub;
  	this.awayClub = awayClub;
  	this.homeScorers = new ArrayList<Player>();
  	this.awayScorers = new ArrayList<Player>();  	
  }
  

  /**
   * Returns the club who hosts the match.
   * 
   * @return home club
   */
  public Club getHomeClub() {
    return this.homeClub;
  }
  
  
  /**
   * Returns the club who is visiting the home club to play the match.
   * 
   * @return away club
   */
  public Club getAwayClub() {
    return this.awayClub;
  }
  
  
  /**
   * Records a goal as having been scored in the match.
   * Whether the goal is a home goal or an away goal is
   * determined by checking the employer of the given
   * goalscorer. (If the given scorer is not employed by
   * either club, the method does nothing.)
   * 
   * @param scorer the player who scored the goal
   */
  public void addGoal(Player scorer) {
    if(scorer.getEmployer() == this.awayClub) 
    	this.awayScorers.add(scorer);
    if (scorer.getEmployer() == this.homeClub)
    	this.homeScorers.add(scorer);
  }

  
  /**
   * Returns the number of goals scored by the home team.
   * 
   * @return home team's goal count
   */
  public int getHomeGoals() {
    return this.homeScorers.size();
  }
  

  /**
   * Returns the number of goals scored by the away team.
   * 
   * @return away team's goal count
   */
  public int getAwayGoals() {
    return this.awayScorers.size();
  }
  

  /**
   * Returns the total number of goals scored by 
   * the two teams.
   * 
   * @return total goal count
   */
  public int getTotalGoals() {
  	return this.getHomeGoals() + this.getAwayGoals();
  }
  

  /**
   * Returns the goal difference of the match. If the home
   * team won, a positive integer indicating the win margin
   * is returned. Similarly, a negative integer indicates an
   * away win. A tied match has a goal difference of zero.
   * 
   * @return goal difference 
   */
  public int getGoalDifference() {
    return this.getHomeGoals() - this.getAwayGoals();
  }


  /**
   * Returns the club whose team won the match (or is about to
   * win it, assuming the current result stands). That is,
   * returns the club who has scored more goals than the other
   * one.
   * 
   * @return winning team or <CODE>null</CODE> if the game is tied
   */
  public Club getWinner() {
    if (this.getHomeGoals() < this.getAwayGoals())
    	return this.awayClub;
    else if 
    (this.getHomeGoals() > this.getAwayGoals())
    	return this.homeClub;
    else 
    	return null;
  }
  

  /**
   * Returns the player who scored the so-called "winning goal".
   * The winning goal of a match is the first goal for the winning
   * team scoring which was "necessary" in light of the match scoreline.
   * For instance, if the score is 4-2 to the home team, then the
   * third goal scored by the home team is the "winning goal". 
   * A tied match has no winning goal or winning goal scorer.
   * 
   * @return winning goal scorer, or <CODE>null</CODE> in case of a tie
   */
  public Player getWinningGoalScorer() {
    int goalDifference = this.getGoalDifference();
    
    if (goalDifference < 0) 
      
    return this.awayScorers.get(this.homeScorers.size());
    
    else if 
    (goalDifference > 0) 
    
      return this.homeScorers.get(this.awayScorers.size());
    else 
    
      return null;
   
  }
  
  
}