/*
 * barrier -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2002 Chris Schoeneman
 *
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 *
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include "barrier/DragInformation.h"
#include "barrier/clipboard_types.h"
#include "barrier/IScreen.h"
#include "barrier/key_types.h"
#include "barrier/mouse_types.h"
#include "barrier/option_types.h"
#include "base/String.h"

class IClipboard;
class IPlatformScreen;
class IEventQueue;

namespace barrier {

//! Platform independent screen
/*!
This is a platform independent screen.  It can work as either a
primary or secondary screen.
*/
class Screen : public IScreen {
public:
    Screen(IPlatformScreen* platformScreen, IEventQueue* events);
    virtual ~Screen();

#ifdef BARRIER_TEST_ENV
    Screen() : m_mock(true) { }
#endif

    //! @name manipulators
    //@{

    //! Activate screen
    /*!
    Activate the screen, preparing it to report system and user events.
    For a secondary screen it also means disabling the screen saver if
    synchronizing it and preparing to synthesize events.
    */
    virtual void        enable();

    //! Deactivate screen
    /*!
    Undoes the operations in activate() and events are no longer
    reported.  It also releases keys that are logically pressed.
    */
    virtual void        disable();

    //! Enter screen
    /*!
    Called when the user navigates to this screen.  \p toggleMask has the
    toggle keys that should be turned on on the secondary screen.
    */
    void                enter(KeyModifierMask toggleMask);

    //! Leave screen
    /*!
    Called when the user navigates off this screen.
    */
    bool                leave();

    //! Update configuration
    /*!
    This is called when the configuration has changed.  \c activeSides
    is a bitmask of EDirectionMask indicating which sides of the
    primary screen are linked to clients.
    */
    void                reconfigure(UInt32 activeSides);

    //! Warp cursor
    /*!
    Warps the cursor to the absolute coordinates \c x,y.  Also
    discards input events up to and including the warp before
    returning.
    */
    void                warpCursor(SInt32 x, SInt32 y);

    //! Set clipboard
    /*!
    Sets the system's clipboard contents.  This is usually called
    soon after an enter().
    */
    void                setClipboard(ClipboardID, const IClipboard*);

    //! Grab clipboard
    /*!
    Grabs (i.e. take ownership of) the system clipboard.
    */
    void                grabClipboard(ClipboardID);

    //! Activate/deactivate screen saver
    /*!
    Forcibly activates the screen saver if \c activate is true otherwise
    forcibly deactivates it.
    */
    void                screensaver(bool activate);

    //! Notify of key press
    /*!
    Synthesize key events to generate a press of key \c id.  If possible
    match the given modifier mask.  The KeyButton identifies the physical
    key on the server that generated this key down.  The client must
    ensure that a key up or key repeat that uses the same KeyButton will
    synthesize an up or repeat for the same client key synthesized by
    keyDown().
    */
    void                keyDown(KeyID id, KeyModifierMask, KeyButton);

    //! Notify of key repeat
    /*!
    Synthesize key events to generate a press and release of key \c id
    \c count times.  If possible match the given modifier mask.
    */
    void                keyRepeat(KeyID id, KeyModifierMask,
                            SInt32 count, KeyButton);

    //! Notify of key release
    /*!
    Synthesize key events to generate a release of key \c id.  If possible
    match the given modifier mask.
    */
    void                keyUp(KeyID id, KeyModifierMask, KeyButton);

    //! Notify of mouse press
    /*!
    Synthesize mouse events to generate a press of mouse button \c id.
    */
    void                mouseDown(ButtonID id);

    //! Notify of mouse release
    /*!
    Synthesize mouse events to generate a release of mouse button \c id.
    */
    void                mouseUp(ButtonID id);

    //! Notify of mouse motion
    /*!
    Synthesize mouse events to generate mouse motion to the absolute
    screen position \c xAbs,yAbs.
    */
    void                mouseMove(SInt32 xAbs, SInt32 yAbs);

    //! Notify of mouse motion
    /*!
    Synthesize mouse events to generate mouse motion by the relative
    amount \c xRel,yRel.
    */
    void                mouseRelativeMove(SInt32 xRel, SInt32 yRel);

    //! Notify of mouse wheel motion
    /*!
    Synthesize mouse events to generate mouse wheel motion of \c xDelta
    and \c yDelta.  Deltas are positive for motion away from the user or
    to the right and negative for motion towards the user or to the left.
    Each wheel click should generate a delta of +/-120.
    */
    void                mouseWheel(SInt32 xDelta, SInt32 yDelta);

    //! Notify of options changes
    /*!
    Resets all options to their default values.
    */
    virtual void        resetOptions();

    //! Notify of options changes
    /*!
    Set options to given values.  Ignores unknown options and doesn't
    modify options that aren't given in \c options.
    */
    virtual void        setOptions(const OptionsList& options);

    //! Set clipboard sequence number
    /*!
    Sets the sequence number to use in subsequent clipboard events.
    */
    void                setSequenceNumber(UInt32);

    //! Register a system hotkey
    /*!
    Registers a system-wide hotkey for key \p key with modifiers \p mask.
    Returns an id used to unregister the hotkey.
    */
    UInt32                registerHotKey(KeyID key, KeyModifierMask mask);

    //! Unregister a system hotkey
    /*!
    Unregisters a previously registered hot key.
    */
    void                unregisterHotKey(UInt32 id);

    //! Prepare to synthesize input on primary screen
    /*!
    Prepares the primary screen to receive synthesized input.  We do not
    want to receive this synthesized input as user input so this method
    ensures that we ignore it.  Calls to \c fakeInputBegin() may not be
    nested.
    */
    void                fakeInputBegin();

    //! Done synthesizing input on primary screen
    /*!
    Undoes whatever \c fakeInputBegin() did.
    */
    void                fakeInputEnd();

    //! Change dragging status
    void                setDraggingStarted(bool started);

    //! Fake a files dragging operation
    void                startDraggingFiles(DragFileList& fileList);

    void                setEnableDragDrop(bool enabled);
    //@}
    //! @name accessors
    //@{

    //! Test if cursor on screen
    /*!
    Returns true iff the cursor is on the screen.
    */
    bool                isOnScreen() const;

    //! Get screen lock state
    /*!
    Returns true if there's any reason that the user should not be
    allowed to leave the screen (usually because a button or key is
    pressed).  If this method returns true it logs a message as to
    why at the CLOG_DEBUG level.
    */
    bool                isLockedToScreen() const;

    //! Get jump zone size
    /*!
    Return the jump zone size, the size of the regions on the edges of
    the screen that cause the cursor to jump to another screen.
    */
    SInt32                getJumpZoneSize() const;

    //! Get cursor center position
    /*!
    Return the cursor center position which is where we park the
    cursor to compute cursor motion deltas and should be far from
    the edges of the screen, typically the center.
    */
    void                getCursorCenter(SInt32& x, SInt32& y) const;

    //! Get the active modifiers
    /*!
    Returns the modifiers that are currently active according to our
    shadowed state.
    */
    KeyModifierMask        getActiveModifiers() const;

    //! Get the active modifiers from OS
    /*!
    Returns the modifiers that are currently active according to the
    operating system.
    */
    KeyModifierMask        pollActiveModifiers() const;

    //! Test if file is dragged on primary screen
    bool                isDraggingStarted() const;

    //! Test if file is dragged on secondary screen
    bool                isFakeDraggingStarted() const;

    //! Get the filename of the file being dragged
    String&            getDraggingFilename() const;

    //! Clear the filename of the file that was dragged
    void                clearDraggingFilename();

    //! Get the drop target directory
    const String&        getDropTarget() const;
    //! Set the drop target directory
    void                 setDropTarget(const String&);

    //@}

    // IScreen overrides
    virtual void*        getEventTarget() const;
    virtual bool        getClipboard(ClipboardID id, IClipboard*) const;
    virtual void        getShape(SInt32& x, SInt32& y,
                            SInt32& width, SInt32& height) const;
    virtual void        getCursorPos(SInt32& x, SInt32& y) const;

    IPlatformScreen*    getPlatformScreen() { return m_screen; }

protected:
    void                enablePrimary();
    void                enableSecondary();
    void                disablePrimary();
    void                disableSecondary();

    void                enterPrimary();
    void                enterSecondary(KeyModifierMask toggleMask);
    void                leavePrimary();
    void                leaveSecondary();

private:
    // our platform dependent screen
    IPlatformScreen*    m_screen;

    // true if screen is being used as a primary screen, false otherwise
    bool                m_isPrimary;

    // true if screen is enabled
    bool                m_enabled;

    // true if the cursor is on this screen
    bool                m_entered;

    // true if screen saver should be synchronized to server
    bool                m_screenSaverSync;

    // note toggle keys that toggles on up/down (false) or on
    // transition (true)
    KeyModifierMask        m_halfDuplex;

    // true if we're faking input on a primary screen
    bool                m_fakeInput;

    IEventQueue*        m_events;

    bool                m_mock;
    bool                m_enableDragDrop;
};

}
