/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "sky/engine/config.h"

#include <gtest/gtest.h>
#include "sky/engine/wtf/HashSet.h"
#include "sky/engine/wtf/OwnPtr.h"
#include "sky/engine/wtf/PassOwnPtr.h"
#include "sky/engine/wtf/RefCounted.h"

namespace {

template<int initialCapacity>
    struct InitialCapacityTestHashTraits : public WTF::UnsignedWithZeroKeyHashTraits<int> {
    static const int minimumTableSize = initialCapacity;
};

template<unsigned size>
void testInitialCapacity()
{
    const unsigned initialCapacity = WTF::HashTableCapacityForSize<size>::value;
    HashSet<int, DefaultHash<int>::Hash, InitialCapacityTestHashTraits<initialCapacity> > testSet;

    // Initial capacity is null.
    EXPECT_EQ(0UL, testSet.capacity());

    // Adding items up to size should never change the capacity.
    for (size_t i = 0; i < size; ++i) {
        testSet.add(i);
        EXPECT_EQ(initialCapacity, testSet.capacity());
    }

    // Adding items up to less than half the capacity should not change the capacity.
    unsigned capacityLimit = initialCapacity / 2 - 1;
    for (size_t i = size; i < capacityLimit; ++i) {
        testSet.add(i);
        EXPECT_EQ(initialCapacity, testSet.capacity());
    }

    // Adding one more item increase the capacity.
    testSet.add(initialCapacity);
    EXPECT_GT(testSet.capacity(), initialCapacity);
}

template<unsigned size> void generateTestCapacityUpToSize();
template<> void generateTestCapacityUpToSize<0>()
{
}
template<unsigned size> void generateTestCapacityUpToSize()
{
    generateTestCapacityUpToSize<size - 1>();
    testInitialCapacity<size>();
}

TEST(HashSetTest, InitialCapacity)
{
    generateTestCapacityUpToSize<128>();
}

struct Dummy {
    Dummy(bool& deleted) : deleted(deleted) { }

    ~Dummy()
    {
        deleted = true;
    }

    bool& deleted;
};

TEST(HashSetTest, HashSetOwnPtr)
{
    bool deleted1 = false, deleted2 = false;

    typedef HashSet<OwnPtr<Dummy> > OwnPtrSet;
    OwnPtrSet set;

    Dummy* ptr1 = new Dummy(deleted1);
    {
        // AddResult in a separate scope to avoid assertion hit,
        // since we modify the container further.
        HashSet<OwnPtr<Dummy> >::AddResult res1 = set.add(adoptPtr(ptr1));
        EXPECT_EQ(ptr1, res1.storedValue->get());
    }

    EXPECT_FALSE(deleted1);
    EXPECT_EQ(1UL, set.size());
    OwnPtrSet::iterator it1 = set.find(ptr1);
    EXPECT_NE(set.end(), it1);
    EXPECT_EQ(ptr1, (*it1));

    Dummy* ptr2 = new Dummy(deleted2);
    {
        HashSet<OwnPtr<Dummy> >::AddResult res2 = set.add(adoptPtr(ptr2));
        EXPECT_EQ(res2.storedValue->get(), ptr2);
    }

    EXPECT_FALSE(deleted2);
    EXPECT_EQ(2UL, set.size());
    OwnPtrSet::iterator it2 = set.find(ptr2);
    EXPECT_NE(set.end(), it2);
    EXPECT_EQ(ptr2, (*it2));

    set.remove(ptr1);
    EXPECT_TRUE(deleted1);

    set.clear();
    EXPECT_TRUE(deleted2);
    EXPECT_TRUE(set.isEmpty());

    deleted1 = false;
    deleted2 = false;
    {
        OwnPtrSet set;
        set.add(adoptPtr(new Dummy(deleted1)));
        set.add(adoptPtr(new Dummy(deleted2)));
    }
    EXPECT_TRUE(deleted1);
    EXPECT_TRUE(deleted2);

    deleted1 = false;
    deleted2 = false;
    OwnPtr<Dummy> ownPtr1;
    OwnPtr<Dummy> ownPtr2;
    ptr1 = new Dummy(deleted1);
    ptr2 = new Dummy(deleted2);
    {
        OwnPtrSet set;
        set.add(adoptPtr(ptr1));
        set.add(adoptPtr(ptr2));
        ownPtr1 = set.take(ptr1);
        EXPECT_EQ(1UL, set.size());
        ownPtr2 = set.takeAny();
        EXPECT_TRUE(set.isEmpty());
    }
    EXPECT_FALSE(deleted1);
    EXPECT_FALSE(deleted2);

    EXPECT_EQ(ptr1, ownPtr1);
    EXPECT_EQ(ptr2, ownPtr2);
}

class DummyRefCounted: public WTF::RefCounted<DummyRefCounted> {
public:
    DummyRefCounted(bool& isDeleted) : m_isDeleted(isDeleted) { m_isDeleted = false; }
    ~DummyRefCounted() { m_isDeleted = true; }

    void ref()
    {
        WTF::RefCounted<DummyRefCounted>::ref();
        ++s_refInvokesCount;
    }

    static int s_refInvokesCount;

private:
    bool& m_isDeleted;
};

int DummyRefCounted::s_refInvokesCount = 0;

TEST(HashSetTest, HashSetRefPtr)
{
    bool isDeleted = false;
    RefPtr<DummyRefCounted> ptr = adoptRef(new DummyRefCounted(isDeleted));
    EXPECT_EQ(0, DummyRefCounted::s_refInvokesCount);
    HashSet<RefPtr<DummyRefCounted> > set;
    set.add(ptr);
    // Referenced only once (to store a copy in the container).
    EXPECT_EQ(1, DummyRefCounted::s_refInvokesCount);

    DummyRefCounted* rawPtr = ptr.get();

    EXPECT_TRUE(set.contains(rawPtr));
    EXPECT_NE(set.end(), set.find(rawPtr));
    EXPECT_TRUE(set.contains(ptr));
    EXPECT_NE(set.end(), set.find(ptr));

    ptr.clear();
    EXPECT_FALSE(isDeleted);

    set.remove(rawPtr);
    EXPECT_TRUE(isDeleted);
    EXPECT_TRUE(set.isEmpty());
    EXPECT_EQ(1, DummyRefCounted::s_refInvokesCount);
}


} // namespace