/**
 * @file llcallingcard.h
 * @brief Definition of the LLPreviewCallingCard class
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * 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_LLCALLINGCARD_H
#define LL_LLCALLINGCARD_H

#include <map>
#include <set>
#include <string>
#include <vector>
#include "lluserrelations.h"
#include "lluuid.h"
#include "v3dmath.h"

//class LLInventoryModel;
//class LLInventoryObserver;
class LLMessageSystem;
class LLTrackingData;

class LLFriendObserver
{
public:
    // This enumeration is a way to refer to what changed in a more
    // human readable format. You can mask the value provided by
    // changed() to see if the observer is interested in the change.
    enum
    {
        NONE = 0,
        ADD = 1,
        REMOVE = 2,
        ONLINE = 4,
        POWERS = 8,
        ALL = 0xffffffff
    };
    virtual ~LLFriendObserver() {}
    virtual void changed(U32 mask) = 0;
};

/*
struct LLBuddyInfo
{
    bool mIsOnline;
    bool mIsEmpowered;
    LLBuddyInfo() : mIsOnline(false), mIsEmpowered(false) {}
};
*/

// This is used as a base class for doing operations on all buddies.
class LLRelationshipFunctor
{
public:
    virtual ~LLRelationshipFunctor() {}
    virtual bool operator()(const LLUUID& buddy_id, LLRelationship* buddy) = 0;
};


class LLAvatarTracker
{
public:
    static LLAvatarTracker& instance() { return sInstance; }

    void track(const LLUUID& avatar_id, const std::string& name);
    void untrack(const LLUUID& avatar_id);
    bool isTrackedAgentValid() { return mTrackedAgentValid; }
    void setTrackedAgentValid(bool valid) { mTrackedAgentValid = valid; }
    void findAgent();

    // coarse update information
    void setTrackedCoarseLocation(const LLVector3d& global_pos);

    // dealing with the tracked agent location
    bool haveTrackingInfo();
    void getDegreesAndDist(F32& rot, F64& horiz_dist, F64& vert_dist);
    LLVector3d getGlobalPos();

    // Get the name passed in, returns null string if uninitialized.
    const std::string& getName();

    // Get the avatar being tracked, returns LLUUID::null if uninitialized
    const LLUUID& getAvatarID();

    // Deal with inventory
    //void observe(LLInventoryModel* model);
    //void inventoryChanged();

    // add or remove agents from buddy list. Each method takes a set
    // of buddies and returns how many were actually added or removed.
    typedef std::map<LLUUID, LLRelationship*> buddy_map_t;

    S32 addBuddyList(const buddy_map_t& buddies);
    //S32 removeBuddyList(const buddy_list_t& exes);
    void copyBuddyList(buddy_map_t& buddies) const;

    // deal with termination of friendhsip
    void terminateBuddy(const LLUUID& id);

    // get full info
    const LLRelationship* getBuddyInfo(const LLUUID& id) const;

    // Is this person a friend/buddy/calling card holder?
    bool isBuddy(const LLUUID& id) const;

    // online status
    void setBuddyOnline(const LLUUID& id, bool is_online);
    bool isBuddyOnline(const LLUUID& id) const;

    // simple empowered status
    void setBuddyEmpowered(const LLUUID& id, bool is_empowered);
    bool isBuddyEmpowered(const LLUUID& id) const;

    // set the empower bit & message the server.
    void empowerList(const buddy_map_t& list, bool grant);
    void empower(const LLUUID& id, bool grant); // wrapper for above

    // register callbacks
    void registerCallbacks(LLMessageSystem* msg);

    // Add/remove an observer. If the observer is destroyed, be sure
    // to remove it. On destruction of the tracker, it will delete any
    // observers left behind.
    void addObserver(LLFriendObserver* observer);
    void removeObserver(LLFriendObserver* observer);
    void idleNotifyObservers();
    void notifyObservers();

    // Observers interested in updates of a particular avatar.
    // On destruction these observers are NOT deleted.
    void addParticularFriendObserver(const LLUUID& buddy_id, LLFriendObserver* observer);
    void removeParticularFriendObserver(const LLUUID& buddy_id, LLFriendObserver* observer);
    void notifyParticularFriendObservers(const LLUUID& buddy_id);

    /**
     * Stores flag for change and id of object change applies to
     *
     * This allows outsiders to tell the AvatarTracker if something has
     * been changed 'under the hood',
     * and next notification will have exact avatar IDs have been changed.
     */
    void addChangedMask(U32 mask, const LLUUID& referent);

    const std::set<LLUUID>& getChangedIDs() { return mChangedBuddyIDs; }

    // Apply the functor to every buddy. Do not actually modify the
    // buddy list in the functor or bad things will happen.
    void applyFunctor(LLRelationshipFunctor& f);

    static void formFriendship(const LLUUID& friend_id);

protected:
    void deleteTrackingData();
    void agentFound(const LLUUID& prey,
                    const LLVector3d& estimated_global_pos);

    // Message system functionality
    static void processAgentFound(LLMessageSystem* msg, void**);
    static void processOnlineNotification(LLMessageSystem* msg, void**);
    static void processOfflineNotification(LLMessageSystem* msg, void**);
    //static void processGrantedProxies(LLMessageSystem* msg, void**);
    static void processTerminateFriendship(LLMessageSystem* msg, void**);
    static void processChangeUserRights(LLMessageSystem* msg, void**);

    void processNotify(LLMessageSystem* msg, bool online);
    void processChange(LLMessageSystem* msg);

protected:
    static LLAvatarTracker sInstance;
    LLTrackingData* mTrackingData;
    bool mTrackedAgentValid;
    U32 mModifyMask;
    //LLInventoryModel* mInventory;
    //LLInventoryObserver* mInventoryObserver;

    buddy_map_t mBuddyInfo;

    typedef std::set<LLUUID> changed_buddy_t;
    changed_buddy_t mChangedBuddyIDs;

    typedef std::vector<LLFriendObserver*> observer_list_t;
    observer_list_t mObservers;

    typedef std::set<LLFriendObserver*> observer_set_t;
    typedef std::map<LLUUID, observer_set_t> observer_map_t;
    observer_map_t mParticularFriendObserverMap;

private:
    // do not implement
    LLAvatarTracker(const LLAvatarTracker&);
    bool operator==(const LLAvatarTracker&);

    bool mIsNotifyObservers;

public:
    // don't you dare create or delete this object
    LLAvatarTracker();
    ~LLAvatarTracker();
};

// collect set of LLUUIDs we're a proxy for
class LLCollectProxyBuddies : public LLRelationshipFunctor
{
public:
    LLCollectProxyBuddies() {}
    virtual ~LLCollectProxyBuddies() {}
    virtual bool operator()(const LLUUID& buddy_id, LLRelationship* buddy);
    typedef std::set<LLUUID> buddy_list_t;
    buddy_list_t mProxy;
};

// collect dictionary sorted map of name -> agent_id for every online buddy
class LLCollectMappableBuddies : public LLRelationshipFunctor
{
public:
    LLCollectMappableBuddies() {}
    virtual ~LLCollectMappableBuddies() {}
    virtual bool operator()(const LLUUID& buddy_id, LLRelationship* buddy);
    typedef std::map<LLUUID, std::string> buddy_map_t;
    buddy_map_t mMappable;
    std::string mFullName;
};

// collect dictionary sorted map of name -> agent_id for every online buddy
class LLCollectOnlineBuddies : public LLRelationshipFunctor
{
public:
    LLCollectOnlineBuddies() {}
    virtual ~LLCollectOnlineBuddies() {}
    virtual bool operator()(const LLUUID& buddy_id, LLRelationship* buddy);
    typedef std::map<LLUUID, std::string> buddy_map_t;
    buddy_map_t mOnline;
    std::string mFullName;
};

// collect dictionary sorted map of name -> agent_id for every buddy,
// one map is offline and the other map is online.
class LLCollectAllBuddies : public LLRelationshipFunctor
{
public:
    LLCollectAllBuddies() {}
    virtual ~LLCollectAllBuddies() {}
    virtual bool operator()(const LLUUID& buddy_id, LLRelationship* buddy);
    typedef std::map<LLUUID, std::string> buddy_map_t;
    buddy_map_t mOnline;
    buddy_map_t mOffline;
    std::string mFullName;
};

#endif // LL_LLCALLINGCARD_H