package fr.umlv.queue;
 
import static org.junit.Assert.*;

import java.util.Iterator;
import java.util.NoSuchElementException;

import org.junit.Test;

public class ResizableFifoTest {
  @Test(expected=IllegalArgumentException.class)
  public void testFifoCapacity() {
    new ResizableFifo<String>(-3);
  }
  
  @Test(expected=IllegalArgumentException.class)
  public void testFifoCapacity2() {
    new ResizableFifo<Integer>(0);
  }

  @Test
  public void testEmpty() {
    ResizableFifo<Double> fifo = new ResizableFifo<>();
    assertNull(fifo.poll());
  }
  
  @Test
  public void testFull() {
    ResizableFifo<Integer> fifo = new ResizableFifo<>();
    for(int i=0; i<100000; i++) {
      assertTrue(fifo.offer(i));
    }
  }

  @Test
  public void testContract() {
    ResizableFifo<Integer> fifo = new ResizableFifo<>();
    for(int i=0; i<10000; i++) {
      fifo.offer(i);
    }
    for(int i=0; i<10000; i++) {
      assertEquals(i, (int)fifo.poll());
    }
  }

  @Test
  public void testSize() {
    ResizableFifo<String> fifo = new ResizableFifo<>();
    for(int i=0; i<10000; i++) {
      assertEquals(i, fifo.size());
      fifo.offer("foo");
    }
  }
  
  @Test
  public void testIsEmpty() {
    ResizableFifo<String> fifo = new ResizableFifo<>();
    assertTrue(fifo.isEmpty());
    fifo.offer("oof");
    assertFalse(fifo.isEmpty());
    fifo.offer("rab");
    assertFalse(fifo.isEmpty());
    fifo.poll();
    fifo.poll();
    assertTrue(fifo.isEmpty());
  }
  
  public void testPeek() {
    ResizableFifo<String> fifo = new ResizableFifo<>();
    assertNull(fifo.peek());
  }
  
  @Test
  public void testPeek2() {
    ResizableFifo<Integer> fifo = new ResizableFifo<>();
    fifo.offer(117);
    assertEquals(117, (int)fifo.peek());
    fifo.poll();
    fifo.offer(145);
    fifo.offer(541);
    assertEquals(145, (int)fifo.peek());
    fifo.poll();
    assertEquals(541, (int)fifo.peek());
  }
  
  @Test(expected=NoSuchElementException.class)
  public void testRemove() {
    ResizableFifo<Integer> fifo = new ResizableFifo<>();
    fifo.remove();
  }
  
  @Test(expected=NoSuchElementException.class)
  public void testElement() {
    ResizableFifo<Integer> fifo = new ResizableFifo<>();
    fifo.element();
  }
  
  public void testClear() {
    ResizableFifo<String> fifo = new ResizableFifo<>();
    for(int i = 0; i < 17; i++) {
      fifo.offer("baz");
    }
    fifo.clear();
    assertNull(fifo.peek());
  }
  
  @Test
  public void testIterator() {
    ResizableFifo<Integer> fifo = new ResizableFifo<>();
    for(int i=0; i<10000; i++) {
      fifo.offer(i);
    }
    
    int i = 0; 
    for(int value: fifo) {
      assertEquals(i++, value);
    }
    
    assertEquals(fifo.size(), 10000);
  }
  
  @Test
  public void testToString() {
    ResizableFifo<Integer> fifo = new ResizableFifo<>();
    for(int i=0; i<7537; i++) {
      fifo.offer(i);
    }
    
    StringBuilder builder = new StringBuilder().append('[');
    for(Iterator<Integer> it = fifo.iterator(); it.hasNext();) {
      builder.append(it.next());
      if (it.hasNext()) {
        builder.append(", ");
      }
    }
    String text = builder.append(']').toString();
    
    assertEquals(text, fifo.toString());
  }
  
  @Test
  public void testAddAll() {
    ResizableFifo<Integer> fifo = new ResizableFifo<>();
    for(int i=0; i<3; i++) {
      fifo.offer(i);
    }
    
    ResizableFifo<Object> fifo2 = new ResizableFifo<>();
    fifo2.addAll(fifo);
    
    assertEquals(fifo2, fifo);
  }
}