/**
 * @file llchiclet.h
 * @brief LLChiclet class header file
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLCHICLET_H
#define LL_LLCHICLET_H

#include "llavatariconctrl.h"
#include "llbutton.h"
#include "llnotifications.h"
#include "lltextbox.h"

class LLMenuGL;
class LLFloaterIMSession;

/**
 * Class for displaying amount of messages/notifications(unread).
 */
class LLChicletNotificationCounterCtrl : public LLTextBox
{
public:

    struct Params : public LLInitParam::Block<Params, LLTextBox::Params>
    {
        /**
         * Contains maximum displayed count of unread messages. Default value is 9.
         *
         * If count is less than "max_unread_count" will be displayed as is.
         * Otherwise 9+ will be shown (for default value).
         */
        Optional<S32> max_displayed_count;

        Params();
    };

    /**
     * Sets number of notifications
     */
    virtual void setCounter(S32 counter);

    /**
     * Returns number of notifications
     */
    virtual S32 getCounter() const { return mCounter; }

    /**
     * Returns width, required to display amount of notifications in text form.
     * Width is the only valid value.
     */
    /*virtual*/ LLRect getRequiredRect();

    /**
     * Sets number of notifications using LLSD
     */
    /*virtual*/ void setValue(const LLSD& value);

    /**
     * Returns number of notifications wrapped in LLSD
     */
    /*virtual*/ LLSD getValue() const;

protected:

    LLChicletNotificationCounterCtrl(const Params& p);
    friend class LLUICtrlFactory;

private:

    S32 mCounter;
    S32 mInitialWidth;
    S32 mMaxDisplayedCount;
};

/**
 * Class for displaying avatar's icon in P2P chiclet.
 */
class LLChicletAvatarIconCtrl : public LLAvatarIconCtrl
{
public:

    struct Params : public LLInitParam::Block<Params, LLAvatarIconCtrl::Params>
    {
        Params()
        {
            changeDefault(draw_tooltip, false);
            changeDefault(mouse_opaque, false);
            changeDefault(default_icon_name, "Generic_Person");
        };
    };

protected:

    LLChicletAvatarIconCtrl(const Params& p);
    friend class LLUICtrlFactory;
};

/**
 * Class for displaying icon in inventory offer chiclet.
 */
class LLChicletInvOfferIconCtrl : public LLChicletAvatarIconCtrl
{
public:

    struct Params :
        public LLInitParam::Block<Params, LLChicletAvatarIconCtrl::Params>
    {
        Optional<std::string> default_icon;

        Params()
        :   default_icon("default_icon", "Generic_Object_Small")
        {
            changeDefault(avatar_id, LLUUID::null);
        };
    };

    /**
     * Sets icon, if value is LLUUID::null - default icon will be set.
     */
    virtual void setValue(const LLSD& value );

protected:

    LLChicletInvOfferIconCtrl(const Params& p);
    friend class LLUICtrlFactory;

private:
    std::string mDefaultIcon;
};

/**
 * Base class for all chiclets.
 */
class LLChiclet : public LLUICtrl
{
public:

    struct Params : public LLInitParam::Block<Params, LLUICtrl::Params>
    {
        Optional<bool> show_counter,
                       enable_counter;

        Params();
    };

    virtual ~LLChiclet() {}

    /**
     * Associates chat session id with chiclet.
     */
    virtual void setSessionId(const LLUUID& session_id) { mSessionId = session_id; }

    /**
     * Returns associated chat session.
     */
    virtual const LLUUID& getSessionId() const { return mSessionId; }

    /**
     * Sets show counter state.
     */
    virtual void setShowCounter(bool show) { mShowCounter = show; }

    /**
     * Connects chiclet clicked event with callback.
     */
    /*virtual*/ boost::signals2::connection setLeftButtonClickCallback(
        const commit_callback_t& cb);

    typedef boost::function<void (LLChiclet* ctrl, const LLSD& param)>
        chiclet_size_changed_callback_t;

    /**
     * Connects chiclets size changed event with callback.
     */
    virtual boost::signals2::connection setChicletSizeChangedCallback(
        const chiclet_size_changed_callback_t& cb);

    /**
     * Sets IM Session id using LLSD
     */
    /*virtual*/ LLSD getValue() const;

    /**
     * Returns IM Session id using LLSD
     */
    /*virtual*/ void setValue(const LLSD& value);

protected:

    friend class LLUICtrlFactory;
    LLChiclet(const Params& p);

    /**
     * Notifies subscribers about click on chiclet.
     */
    /*virtual*/ bool handleMouseDown(S32 x, S32 y, MASK mask);

    /**
     * Notifies subscribers about chiclet size changed event.
     */
    virtual void onChicletSizeChanged();

private:

    LLUUID mSessionId;

    bool mShowCounter;

    typedef boost::signals2::signal<void (LLChiclet* ctrl, const LLSD& param)>
        chiclet_size_changed_signal_t;

    chiclet_size_changed_signal_t mChicletSizeChangedSignal;
};


/**
 * Base class for Instant Message chiclets.
 * IMChiclet displays icon, number of unread messages(optional)
 * and voice chat status(optional).
 */
class LLIMChiclet : public LLChiclet
{
public:
    enum EType {
        TYPE_UNKNOWN,
        TYPE_IM,
        TYPE_GROUP,
        TYPE_AD_HOC
    };
    struct Params : public LLInitParam::Block<Params, LLChiclet::Params>
    {};


    virtual ~LLIMChiclet();

    /**
     * It is used for default setting up of chicklet:click handler, etc.
     */
    bool postBuild();

    /**
     * Sets IM session name. This name will be displayed in chiclet tooltip.
     */
    virtual void setIMSessionName(const std::string& name) { setToolTip(name); }

    /**
     * Sets id of person/group user is chatting with.
     * Session id should be set before calling this
     */
    virtual void setOtherParticipantId(const LLUUID& other_participant_id) { mOtherParticipantId = other_participant_id; }

    /**
     * Enables/disables the counter control for a chiclet.
     */
    virtual void enableCounterControl(bool enable);

    /**
    * Sets required width for a chiclet according to visible controls.
    */
    virtual void setRequiredWidth();

    /**
     * Shows/hides overlay icon concerning new unread messages.
     */
    virtual void setShowNewMessagesIcon(bool show);

    /**
     * Returns visibility of overlay icon concerning new unread messages.
     */
    virtual bool getShowNewMessagesIcon();

    /**
     * The action taken on mouse down event.
     *
     * Made public so that it can be triggered from outside
     * (more specifically, from the Active IM window).
     */
    virtual void onMouseDown();

    virtual void setToggleState(bool toggle);

    /**
     * Displays popup menu.
     */
    virtual bool handleRightMouseDown(S32 x, S32 y, MASK mask);

    void hidePopupMenu();

protected:

    LLIMChiclet(const LLIMChiclet::Params& p);

protected:

    /**
     * Creates chiclet popup menu.
     */
    virtual void createPopupMenu() = 0;

    /**
     * Enables/disables menus.
     */
    virtual void updateMenuItems() {};

    bool canCreateMenu();

    LLHandle<LLUICtrl> mPopupMenuHandle;

    bool mShowSpeaker;
    bool mCounterEnabled;
    /* initial width of chiclet, should not include counter or speaker width */
    S32 mDefaultWidth;

    LLIconCtrl* mNewMessagesIcon;
    LLButton* mChicletButton;

    /** the id of another participant, either an avatar id or a group id*/
    LLUUID mOtherParticipantId;

    template<typename Container>
    struct CollectChicletCombiner {
        typedef Container result_type;

        template<typename InputIterator>
        Container operator()(InputIterator first, InputIterator last) const {
            Container c = Container();
            for (InputIterator iter = first; iter != last; iter++) {
                if (*iter != NULL) {
                    c.push_back(*iter);
                }
            }
            return c;
        }
    };

public:
    static boost::signals2::signal<LLChiclet* (const LLUUID&),
            CollectChicletCombiner<std::list<LLChiclet*> > >
            sFindChicletsSignal;
};


/**
 * Chiclet for script floaters.
 */
class LLScriptChiclet : public LLIMChiclet
{
public:

    struct Params : public LLInitParam::Block<Params, LLIMChiclet::Params>
    {
        Optional<LLButton::Params> chiclet_button;

        Optional<LLIconCtrl::Params> icon;

        Optional<LLIconCtrl::Params> new_message_icon;

        Params();
    };

    /*virtual*/ void setSessionId(const LLUUID& session_id);

    /**
     * Toggle script floater
     */
    /*virtual*/ void onMouseDown();

protected:

    LLScriptChiclet(const Params&);
    friend class LLUICtrlFactory;

    /**
     * Creates chiclet popup menu.
     */
    virtual void createPopupMenu();

    /**
     * Processes clicks on chiclet popup menu.
     */
    virtual void onMenuItemClicked(const LLSD& user_data);

private:

    LLIconCtrl* mChicletIconCtrl;
};

/**
 * Chiclet for inventory offer script floaters.
 */
class LLInvOfferChiclet: public LLIMChiclet
{
public:

    struct Params : public LLInitParam::Block<Params, LLIMChiclet::Params>
    {
        Optional<LLButton::Params> chiclet_button;

        Optional<LLChicletInvOfferIconCtrl::Params> icon;

        Optional<LLIconCtrl::Params> new_message_icon;

        Params();
    };

    /*virtual*/ void setSessionId(const LLUUID& session_id);

    /**
     * Toggle script floater
     */
    /*virtual*/ void onMouseDown();

protected:
    LLInvOfferChiclet(const Params&);
    friend class LLUICtrlFactory;

    /**
     * Creates chiclet popup menu.
     */
    virtual void createPopupMenu();

    /**
     * Processes clicks on chiclet popup menu.
     */
    virtual void onMenuItemClicked(const LLSD& user_data);

private:
    LLChicletInvOfferIconCtrl* mChicletIconCtrl;
};

/**
 * Implements notification chiclet. Used to display total amount of unread messages
 * across all IM sessions, total amount of system notifications. See EXT-3147 for details
 */
class LLSysWellChiclet : public LLChiclet
{
public:

    struct Params : public LLInitParam::Block<Params, LLChiclet::Params>
    {
        Optional<LLButton::Params> button;

        Optional<LLChicletNotificationCounterCtrl::Params> unread_notifications;

        /**
         * Contains maximum displayed count of unread messages. Default value is 9.
         *
         * If count is less than "max_unread_count" will be displayed as is.
         * Otherwise 9+ will be shown (for default value).
         */
        Optional<S32> max_displayed_count;

        Params();
    };

    /*virtual*/ void setCounter(S32 counter);

    // *TODO: mantipov: seems getCounter is not necessary for LLNotificationChiclet
    // but inherited interface requires it to implement.
    // Probably it can be safe removed.
    /*virtual*/S32 getCounter() { return mCounter; }

    boost::signals2::connection setClickCallback(const commit_callback_t& cb);

    /*virtual*/ ~LLSysWellChiclet();

    void setToggleState(bool toggled);

    void setNewMessagesState(bool new_messages);
    //this method should change a widget according to state of the SysWellWindow
    virtual void updateWidget(bool is_window_empty);

protected:

    LLSysWellChiclet(const Params& p);
    friend class LLUICtrlFactory;

    /**
     * Change Well 'Lit' state from 'Lit' to 'Unlit' and vice-versa.
     *
     * There is an assumption that it will be called 2*N times to do not change its start state.
     * @see FlashToLitTimer
     */
    void changeLitState(bool blink);

    /**
     * Displays menu.
     */
    virtual bool handleRightMouseDown(S32 x, S32 y, MASK mask);

    virtual void createMenu() = 0;

protected:
    class FlashToLitTimer;
    LLButton* mButton;
    S32 mCounter;
    S32 mMaxDisplayedCount;
    bool mIsNewMessagesState;

    LLFlashTimer* mFlashToLitTimer;
    LLHandle<LLContextMenu> mContextMenuHandle;
};

class LLNotificationChiclet : public LLSysWellChiclet
{
    LOG_CLASS(LLNotificationChiclet);

    friend class LLUICtrlFactory;
public:
    struct Params : public LLInitParam::Block<Params, LLSysWellChiclet::Params>{};

protected:
    class ChicletNotificationChannel : public LLNotificationChannel
    {
    public:
        ChicletNotificationChannel(LLNotificationChiclet* chiclet)
            : LLNotificationChannel(LLNotificationChannel::Params().filter(filterNotification).name(chiclet->getSessionId().asString()))
            , mChiclet(chiclet)
        {
            // connect counter handlers to the signals
            connectToChannel("Group Notifications");
            connectToChannel("Offer");
            connectToChannel("Notifications");
        }
        virtual ~ChicletNotificationChannel() {}

        static bool filterNotification(LLNotificationPtr notify);
        // connect counter updaters to the corresponding signals
        /*virtual*/ void onAdd(LLNotificationPtr p) { mChiclet->setCounter(++mChiclet->mUreadSystemNotifications); }
        /*virtual*/ void onLoad(LLNotificationPtr p) { mChiclet->setCounter(++mChiclet->mUreadSystemNotifications); }
        /*virtual*/ void onDelete(LLNotificationPtr p) { mChiclet->setCounter(--mChiclet->mUreadSystemNotifications); }

        LLNotificationChiclet* const mChiclet;
    };

    boost::scoped_ptr<ChicletNotificationChannel> mNotificationChannel;

    LLNotificationChiclet(const Params& p);
    ~LLNotificationChiclet();

    /**
     * Processes clicks on chiclet menu.
     */
    void onMenuItemClicked(const LLSD& user_data);

    /**
     * Enables chiclet menu items.
     */
    bool enableMenuItem(const LLSD& user_data);

    /**
     * Creates menu.
     */
    /*virtual*/ void createMenu();

    /*virtual*/ void setCounter(S32 counter);
    S32 mUreadSystemNotifications;
};

/**
 * Storage class for all IM chiclets. Provides mechanism to display,
 * scroll, create, remove chiclets.
 */
class LLChicletPanel : public LLPanel
{
public:

    struct Params : public LLInitParam::Block<Params, LLPanel::Params>
    {
        Optional<S32> chiclet_padding,
                      scrolling_offset,
                      scroll_button_hpad,
                      scroll_ratio;

        Optional<S32> min_width;

        Params();
    };

    virtual ~LLChicletPanel();

    /**
     * Creates chiclet and adds it to chiclet list at specified index.
     */
    template<class T> T* createChiclet(const LLUUID& session_id, S32 index);

    /**
     * Creates chiclet and adds it to chiclet list at right.
     */
    template<class T> T* createChiclet(const LLUUID& session_id);

    /**
     * Returns pointer to chiclet of specified type at specified index.
     */
    template<class T> T* getChiclet(S32 index);

    /**
     * Returns pointer to LLChiclet at specified index.
     */
    LLChiclet* getChiclet(S32 index) { return getChiclet<LLChiclet>(index); }

    /**
     * Searches a chiclet using IM session id.
     */
    template<class T> T* findChiclet(const LLUUID& im_session_id);

    /**
     * Returns number of hosted chiclets.
     */
    S32 getChicletCount() { return static_cast<S32>(mChicletList.size()); }

    /**
     * Returns index of chiclet in list.
     */
    S32 getChicletIndex(const LLChiclet* chiclet);

    /**
     * Removes chiclet by index.
     */
    void removeChiclet(S32 index);

    /**
     * Removes chiclet by pointer.
     */
    void removeChiclet(LLChiclet* chiclet);

    /**
     * Removes chiclet by IM session id.
     */
    void removeChiclet(const LLUUID& im_session_id);

    /**
     * Removes all chiclets.
     */
    void removeAll();

    /**
     * Scrolls the panel to the specified chiclet
     */
    void scrollToChiclet(const LLChiclet* chiclet);

    boost::signals2::connection setChicletClickedCallback(
        const commit_callback_t& cb);

    /*virtual*/ bool postBuild();

    /**
     * Handler for the Voice Client's signal. Finds a corresponding chiclet and toggles its SpeakerControl
     */
    void onCurrentVoiceChannelChanged(const LLUUID& session_id);

    /**
     * Reshapes controls and rearranges chiclets if needed.
     */
    /*virtual*/ void reshape(S32 width, S32 height, bool called_from_parent = true );

    /*virtual*/ void draw();

    S32 getMinWidth() const { return mMinWidth; }

    /*virtual*/ S32 notifyParent(const LLSD& info);

    /**
     * Toggle chiclet by session id ON and toggle OFF all other chiclets.
     */
    void setChicletToggleState(const LLUUID& session_id, bool toggle);

protected:
    LLChicletPanel(const Params&p);
    friend class LLUICtrlFactory;

    /**
     * Adds chiclet to list and rearranges all chiclets.
     * They should be right aligned, most recent right. See EXT-1293
     *
     * It calculates position of the first chiclet in the list. Other chiclets are placed in arrange().
     *
     * @see arrange()
     */
    bool addChiclet(LLChiclet*, S32 index);

    /**
     * Arranges chiclets to have them in correct positions.
     *
     * Method bases on assumption that first chiclet has correct rect and starts from the its position.
     *
     * @see addChiclet()
     */
    void arrange();

    /**
     * Returns true if chiclets can be scrolled right.
     */
    bool canScrollRight();

    /**
     * Returns true if we need to show scroll buttons
     */
    bool needShowScroll();

    /**
     * Returns true if chiclets can be scrolled left.
     */
    bool canScrollLeft();

    /**
     * Shows or hides chiclet scroll buttons if chiclets can or can not be scrolled.
     */
    void showScrollButtonsIfNeeded();

    /**
     * Shifts chiclets left or right.
     */
    void shiftChiclets(S32 offset, S32 start_index = 0);

    /**
     * Removes gaps between first chiclet and scroll area left side,
     * last chiclet and scroll area right side.
     */
    void trimChiclets();

    /**
     * Scrolls chiclets to right or left.
     */
    void scroll(S32 offset);

    /**
     * Verifies that chiclets can be scrolled left, then calls scroll()
     */
    void scrollLeft();

    /**
     * Verifies that chiclets can be scrolled right, then calls scroll()
     */
    void scrollRight();

    /**
     * Callback for left scroll button clicked
     */
    void onLeftScrollClick();

    /**
     * Callback for right scroll button clicked
     */
    void onRightScrollClick();

    /**
     * Callback for right scroll button held down event
     */
    void onLeftScrollHeldDown();

    /**
     * Callback for left scroll button held down event
     */
    void onRightScrollHeldDown();

    /**
     * Callback for mouse wheel scrolled, calls scrollRight() or scrollLeft()
     */
    bool handleScrollWheel(S32 x, S32 y, S32 clicks);

    /**
     * Notifies subscribers about click on chiclet.
     * Do not place any code here, instead subscribe on event (see setChicletClickedCallback).
     */
    void onChicletClick(LLUICtrl*ctrl,const LLSD&param);

    /**
     * Callback for chiclet size changed event, rearranges chiclets.
     */
    void onChicletSizeChanged(LLChiclet* ctrl, const LLSD& param);

    void onMessageCountChanged(const LLSD& data);

    void objectChicletCallback(const LLSD& data);

    typedef std::vector<LLChiclet*> chiclet_list_t;

    /**
     * Removes chiclet from scroll area and chiclet list.
     */
    void removeChiclet(chiclet_list_t::iterator it);

    S32 getChicletPadding() { return mChicletPadding; }

    S32 getScrollingOffset() { return mScrollingOffset; }

    bool isAnyIMFloaterDoked();

protected:

    chiclet_list_t mChicletList;
    LLButton* mLeftScrollButton;
    LLButton* mRightScrollButton;
    LLPanel* mScrollArea;

    S32 mChicletPadding;
    S32 mScrollingOffset;
    S32 mScrollButtonHPad;
    S32 mScrollRatio;
    S32 mMinWidth;
    bool mShowControls;
    static const S32 s_scroll_ratio;

    boost::signals2::connection mVoiceChannelChanged;
};

template<class T>
T* LLChicletPanel::createChiclet(const LLUUID& session_id, S32 index)
{
    typename T::Params params;
    T* chiclet = LLUICtrlFactory::create<T>(params);
    if(!chiclet)
    {
        LL_WARNS() << "Could not create chiclet" << LL_ENDL;
        return NULL;
    }
    if(!addChiclet(chiclet, index))
    {
        delete chiclet;
        LL_WARNS() << "Could not add chiclet to chiclet panel" << LL_ENDL;
        return NULL;
    }

    if (!isAnyIMFloaterDoked())
    {
        scrollToChiclet(chiclet);
    }

    chiclet->setSessionId(session_id);

    return chiclet;
}

template<class T>
T* LLChicletPanel::createChiclet(const LLUUID& session_id)
{
    return createChiclet<T>(session_id, static_cast<S32>(mChicletList.size()));
}

template<class T>
T* LLChicletPanel::findChiclet(const LLUUID& im_session_id)
{
    if(im_session_id.isNull())
    {
        return NULL;
    }

    chiclet_list_t::const_iterator it = mChicletList.begin();
    for( ; mChicletList.end() != it; ++it)
    {
        LLChiclet* chiclet = *it;

        llassert(chiclet);
        if (!chiclet) continue;
        if(chiclet->getSessionId() == im_session_id)
        {
            T* result = dynamic_cast<T*>(chiclet);
            if(!result)
            {
                LL_WARNS() << "Found chiclet but of wrong type " << LL_ENDL;
                continue;
            }
            return result;
        }
    }
    return NULL;
}

template<class T> T* LLChicletPanel::getChiclet(S32 index)
{
    if(index < 0 || index >= getChicletCount())
    {
        return NULL;
    }

    LLChiclet* chiclet = mChicletList[index];
    T*result = dynamic_cast<T*>(chiclet);
    if(!result && chiclet)
    {
        LL_WARNS() << "Found chiclet but of wrong type " << LL_ENDL;
    }
    return result;
}

#endif // LL_LLCHICLET_H