package cse1030;

import static org.junit.Assert.*;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;

import org.junit.BeforeClass;
import org.junit.Test;

public class PlayingCardTest {

  private static final String[] RANKS = { "2", "3", "4", "5", "6", "7", "8",
      "9", "10", "J", "Q", "K", "A" };
  private static final String[] SUITS = { "S", "C", "D", "H" };
  private static final List<PlayingCard> cards = new ArrayList<PlayingCard>();
  
  @BeforeClass
  public static void init() {
    // generate a 52 card deck in sorted order
    for (String r : RANKS) {
      for (String s : SUITS) {
        cards.add(new PlayingCard(r, s));
      }
    }
  }
  
  @Test
  public void testHashCode() {
    // count of the number of hash code collisions
    // oddly enough, 2 cards have hash codes that collide if
    // the eclipse generated hashCode method is used
    int collisions = 0;
    // compare each card to every other card
    for (int i = 0; i < cards.size(); i++) {
      PlayingCard ci = cards.get(i);
      // does hashCode always return the same value for a card?
      assertTrue(ci.hashCode() == ci.hashCode());
      for (int j = i + 1; j < cards.size(); j++) {
        PlayingCard cj = cards.get(j);
        // are hash codes different for different cards?
        if (ci.hashCode() == cj.hashCode()) {
          collisions++;
        }
      }
    }
    assertTrue(collisions < 3);
  }

  @Test
  public void testConstructor() {
    // does the constructor create cards from valid ranks and suits?
    for (String r : RANKS) {
      for (String s : SUITS) {
        new PlayingCard(r, s);
      }
    }
  }
  
  @Test
  public void testConstructorFailure() {
    // does constructor throw with invalid rank?
    try {
      new PlayingCard("1", "D");
      fail("Expected an IllegalArgumentException to be thrown!");
    }
    catch (IllegalArgumentException x) {
      // this is expected!
    }
    
    // does constructor throw with invalid suit?
    try {
      new PlayingCard("2", "d");
      fail("Expected an IllegalArgumentException to be thrown!");
    }
    catch (IllegalArgumentException x) {
      // this is expected!
    }
  }

  @Test
  public void testGetRank() {
    for (int i = 0; i < cards.size(); i++) {
      int idx = i / SUITS.length;
      String rank = RANKS[idx];
      PlayingCard c = cards.get(i);
      assertTrue(c.getRank().equals(rank));
    }
  }

  @Test
  public void testGetSuit() {
    for (int i = 0; i < cards.size(); i++) {
      int idx = i % SUITS.length;
      String suit = SUITS[idx];
      PlayingCard c = cards.get(i);
      assertTrue(c.getSuit().equals(suit));
    }
  }

  @Test
  public void testEqualsObject() {
    // compare each card to every other card
    for (int i = 0; i < cards.size(); i++) {
      PlayingCard ci = cards.get(i);
      // is a card always equal to itself?
      assertTrue(ci.equals(ci));
      for (int j = i + 1; j < cards.size(); j++) {
        PlayingCard cj = cards.get(j);
        // are different cards not equal?
        assertFalse(ci.equals(cj));
      }
    }
  }

  @Test
  public void testCompareTo() {
 // compare each card to every other card
    for (int i = 0; i < cards.size(); i++) {
      PlayingCard ci = cards.get(i);
      // is a card always equal to itself?
      assertTrue(ci.compareTo(ci) == 0);
      for (int j = i + 1; j < cards.size(); j++) {
        PlayingCard cj = cards.get(j);
        // is ci less than cj?
        assertTrue(ci.compareTo(cj) < 0);
        // is cj greater than ci?
        assertTrue(cj.compareTo(ci) > 0);
      }
    }
  }

  @Test
  public void testToString() {
    int i = 0;
    for (String r : RANKS) {
      for (String s : SUITS) {
        PlayingCard c = cards.get(i++);
        String expected = r + " of " + s;
        assertTrue(c.toString().equals(expected));
      }
    }
  }

  @Test
  public void testGetAllRanks() {
    Set<String> t = PlayingCard.getAllRanks();
    List<String> u = Arrays.asList(RANKS);
    assertTrue(t.containsAll(u));
    assertTrue(u.containsAll(t));
  }

  @Test
  public void testGetAllSuits() {
    Set<String> t = PlayingCard.getAllSuits();
    List<String> u = Arrays.asList(SUITS);
    assertTrue(t.containsAll(u));
    assertTrue(u.containsAll(t));
  }

}