/*
 * Copyright (c) 2014, Google Inc. All rights reserved.
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 *     * Redistributions of source code must retain the above copyright
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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#include "config.h"
#include "core/dom/Document.h"

#include "core/html/HTMLLinkElement.h"
#include "core/testing/DummyPageHolder.h"
#include "platform/heap/Handle.h"
#include <gmock/gmock.h>
#include <gtest/gtest.h>

using namespace blink;

namespace {

class DocumentTest : public ::testing::Test {
protected:
    virtual void SetUp() override;

    Document& document() const { return m_dummyPageHolder->document(); }
    Page& page() const { return m_dummyPageHolder->page(); }

private:
    OwnPtr<DummyPageHolder> m_dummyPageHolder;
};

void DocumentTest::SetUp()
{
    m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
}

class MockDocumentVisibilityObserver
    : public DummyBase<MockDocumentVisibilityObserver>
    , public DocumentVisibilityObserver {
    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MockDocumentVisibilityObserver);
public:
    static PassOwnPtr<MockDocumentVisibilityObserver> create(Document& document)
    {
        return adoptPtr(new MockDocumentVisibilityObserver(document));
    }

    virtual void trace(Visitor*) { }

    MOCK_METHOD1(didChangeVisibilityState, void(PageVisibilityState));

private:
    MockDocumentVisibilityObserver(Document& document) : DocumentVisibilityObserver(document) { }
};

TEST_F(DocumentTest, VisibilityOberver)
{
    page().setVisibilityState(PageVisibilityStateVisible, true); // initial state
    OwnPtr<MockDocumentVisibilityObserver> observer1 = MockDocumentVisibilityObserver::create(document());

    {
        OwnPtr<MockDocumentVisibilityObserver> observer2 = MockDocumentVisibilityObserver::create(document());
        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateHidden)).Times(0);
        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateHidden)).Times(0);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        ::testing::Mock::VerifyAndClearExpectations(observer1.get());
        ::testing::Mock::VerifyAndClearExpectations(observer2.get());

        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateHidden)).Times(1);
        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateHidden)).Times(1);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        page().setVisibilityState(PageVisibilityStateHidden, false);
        ::testing::Mock::VerifyAndClearExpectations(observer1.get());
        ::testing::Mock::VerifyAndClearExpectations(observer2.get());

        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateHidden)).Times(0);
        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateHidden)).Times(0);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        page().setVisibilityState(PageVisibilityStateHidden, false);
        ::testing::Mock::VerifyAndClearExpectations(observer1.get());
        ::testing::Mock::VerifyAndClearExpectations(observer2.get());

        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateHidden)).Times(0);
        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateVisible)).Times(1);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateHidden)).Times(0);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        OwnPtr<DummyPageHolder> alternatePage = DummyPageHolder::create(IntSize(800, 600));
        Document& alternateDocument = alternatePage->document();
        observer2->setObservedDocument(alternateDocument);
        page().setVisibilityState(PageVisibilityStateVisible, false);
        ::testing::Mock::VerifyAndClearExpectations(observer1.get());
        ::testing::Mock::VerifyAndClearExpectations(observer2.get());

        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateHidden)).Times(1);
        EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateHidden)).Times(1);
        EXPECT_CALL(*observer2, didChangeVisibilityState(PageVisibilityStateVisible)).Times(0);
        observer2->setObservedDocument(document());
        page().setVisibilityState(PageVisibilityStateHidden, false);
        ::testing::Mock::VerifyAndClearExpectations(observer1.get());
        ::testing::Mock::VerifyAndClearExpectations(observer2.get());
    }

    // observer2 destroyed
    EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateHidden)).Times(0);
    EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateVisible)).Times(1);
    page().setVisibilityState(PageVisibilityStateVisible, false);
}

} // unnamed namespace