/*
 * Copyright (C) 2018, 2019 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.
 */

#pragma once

#if ENABLE(WEBDRIVER_ACTIONS_API)

#include "WebEvent.h"
#include <WebCore/FrameIdentifier.h>
#include <wtf/CompletionHandler.h>
#include <wtf/HashSet.h>
#include <wtf/Optional.h>
#include <wtf/RefCounted.h>
#include <wtf/RunLoop.h>
#include <wtf/Seconds.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>

namespace Inspector { namespace Protocol { namespace Automation {
enum class ErrorMessage;
enum class KeyboardInteractionType;
enum class MouseButton;
enum class MouseInteraction;
enum class MouseMoveOrigin;
enum class VirtualKey;
} } }

namespace WebKit {

class AutomationCommandError;
using AutomationCompletionHandler = WTF::CompletionHandler<void(Optional<AutomationCommandError>)>;

class WebPageProxy;

using KeyboardInteraction = Inspector::Protocol::Automation::KeyboardInteractionType;
using VirtualKey = Inspector::Protocol::Automation::VirtualKey;
using VirtualKeySet = HashSet<VirtualKey, WTF::IntHash<VirtualKey>, WTF::StrongEnumHashTraits<VirtualKey>>;
using CharKey = char; // For WebDriver, this only needs to support ASCII characters on 102-key keyboard.
using MouseButton = Inspector::Protocol::Automation::MouseButton;
using MouseInteraction = Inspector::Protocol::Automation::MouseInteraction;
using MouseMoveOrigin = Inspector::Protocol::Automation::MouseMoveOrigin;

enum class SimulatedInputSourceType {
    Null, // Used to induce a minimum duration.
    Keyboard,
    Mouse,
    Touch,
};

enum class TouchInteraction {
    TouchDown,
    MoveTo,
    LiftUp,
};

struct SimulatedInputSourceState {
    Optional<CharKey> pressedCharKey;
    VirtualKeySet pressedVirtualKeys;
    Optional<MouseButton> pressedMouseButton;
    Optional<MouseMoveOrigin> origin;
    Optional<String> nodeHandle;
    Optional<WebCore::IntPoint> location;
    Optional<Seconds> duration;

    static SimulatedInputSourceState emptyStateForSourceType(SimulatedInputSourceType);
};

struct SimulatedInputSource : public RefCounted<SimulatedInputSource> {
public:
    SimulatedInputSourceType type;

    // The last state associated with this input source.
    SimulatedInputSourceState state;

    static Ref<SimulatedInputSource> create(SimulatedInputSourceType type)
    {
        return adoptRef(*new SimulatedInputSource(type));
    }

private:
    SimulatedInputSource(SimulatedInputSourceType type)
        : type(type)
        , state(SimulatedInputSourceState::emptyStateForSourceType(type))
    { }
};

struct SimulatedInputKeyFrame {
public:
    using StateEntry = std::pair<SimulatedInputSource&, SimulatedInputSourceState>;

    explicit SimulatedInputKeyFrame(Vector<StateEntry>&&);
    Seconds maximumDuration() const;

    static SimulatedInputKeyFrame keyFrameFromStateOfInputSources(HashSet<Ref<SimulatedInputSource>>&);
    static SimulatedInputKeyFrame keyFrameToResetInputSources(HashSet<Ref<SimulatedInputSource>>&);

    Vector<StateEntry> states;
};

class SimulatedInputDispatcher : public RefCounted<SimulatedInputDispatcher> {
    WTF_MAKE_NONCOPYABLE(SimulatedInputDispatcher);
public:
    class Client {
    public:
        virtual ~Client() { }
#if ENABLE(WEBDRIVER_MOUSE_INTERACTIONS)
        virtual void simulateMouseInteraction(WebPageProxy&, MouseInteraction, MouseButton, const WebCore::IntPoint& locationInView, AutomationCompletionHandler&&) = 0;
#endif
#if ENABLE(WEBDRIVER_TOUCH_INTERACTIONS)
        virtual void simulateTouchInteraction(WebPageProxy&, TouchInteraction, const WebCore::IntPoint& locationInView, Optional<Seconds> duration, AutomationCompletionHandler&&) = 0;
#endif
#if ENABLE(WEBDRIVER_KEYBOARD_INTERACTIONS)
        virtual void simulateKeyboardInteraction(WebPageProxy&, KeyboardInteraction, WTF::Variant<VirtualKey, CharKey>&&, AutomationCompletionHandler&&) = 0;
#endif
        virtual void viewportInViewCenterPointOfElement(WebPageProxy&, Optional<WebCore::FrameIdentifier>, const String& nodeHandle, Function<void (Optional<WebCore::IntPoint>, Optional<AutomationCommandError>)>&&) = 0;
    };

    static Ref<SimulatedInputDispatcher> create(WebPageProxy& page, SimulatedInputDispatcher::Client& client)
    {
        return adoptRef(*new SimulatedInputDispatcher(page, client));
    }

    ~SimulatedInputDispatcher();

    void run(Optional<WebCore::FrameIdentifier>, Vector<SimulatedInputKeyFrame>&& keyFrames, HashSet<Ref<SimulatedInputSource>>& inputSources, AutomationCompletionHandler&&);
    void cancel();

    bool isActive() const;

private:
    SimulatedInputDispatcher(WebPageProxy&, SimulatedInputDispatcher::Client&);

    void transitionToNextKeyFrame();
    void transitionBetweenKeyFrames(const SimulatedInputKeyFrame&, const SimulatedInputKeyFrame&, AutomationCompletionHandler&&);

    void transitionToNextInputSourceState();
    void transitionInputSourceToState(SimulatedInputSource&, SimulatedInputSourceState& newState, AutomationCompletionHandler&&);
    void finishDispatching(Optional<AutomationCommandError>);

    void keyFrameTransitionDurationTimerFired();
    bool isKeyFrameTransitionComplete() const;

    void resolveLocation(const WebCore::IntPoint& currentLocation, Optional<WebCore::IntPoint> location, MouseMoveOrigin, Optional<String> nodeHandle, Function<void (Optional<WebCore::IntPoint>, Optional<AutomationCommandError>)>&&);

    WebPageProxy& m_page;
    SimulatedInputDispatcher::Client& m_client;

    Optional<WebCore::FrameIdentifier> m_frameID;
    AutomationCompletionHandler m_runCompletionHandler;
    AutomationCompletionHandler m_keyFrameTransitionCompletionHandler;
    RunLoop::Timer<SimulatedInputDispatcher> m_keyFrameTransitionDurationTimer;

    Vector<SimulatedInputKeyFrame> m_keyframes;
    HashSet<Ref<SimulatedInputSource>> m_inputSources;

    // The position within m_keyframes.
    unsigned m_keyframeIndex { 0 };

    // The position within the input source state vector at m_keyframes[m_keyframeIndex].
    // Events that reflect input source state transitions are dispatched serially based on this order.
    unsigned m_inputSourceStateIndex { 0 };
};

} // namespace WebKit

#endif // ENABLE(WEBDRIVER_ACTIONS_API)