/**
 * @file llcachename.h
 * @brief A cache of names from UUIDs.
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * 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_LLCACHENAME_H
#define LL_LLCACHENAME_H

#include <boost/bind.hpp>
#include <boost/signals2.hpp>

class LLMessageSystem;
class LLHost;
class LLUUID;


typedef boost::signals2::signal<void (const LLUUID& id,
                                      const std::string& name,
                                      bool is_group)> LLCacheNameSignal;
typedef LLCacheNameSignal::slot_type LLCacheNameCallback;

// Old callback with user data for compatibility
typedef void (*old_callback_t)(const LLUUID&, const std::string&, bool, void*);

// Here's the theory:
// If you request a name that isn't in the cache, it returns "waiting"
// and requests the data.  After the data arrives, you get that on
// subsequent calls.
// If the data hasn't been updated in an hour, it requests it again,
// but keeps giving you the old value until new data arrives.
// If you haven't requested the data in an hour, it releases it.
class LLCacheName
{
public:
    LLCacheName(LLMessageSystem* msg);
    LLCacheName(LLMessageSystem* msg, const LLHost& upstream_host);
    ~LLCacheName();

    // registers the upstream host
    // for viewers, this is the currently connected simulator
    // for simulators, this is the data server
    void setUpstream(const LLHost& upstream_host);

    boost::signals2::connection addObserver(const LLCacheNameCallback& callback);

    // storing cache on disk; for viewer, in name.cache
    bool importFile(std::istream& istr);
    void exportFile(std::ostream& ostr);

    // If available, copies name ("bobsmith123" or "James Linden") into string
    // If not available, copies the string "waiting".
    // Returns true if available.
    bool getFullName(const LLUUID& id, std::string& full_name);

    // Reverse lookup of UUID from name
    bool getUUID(const std::string& first, const std::string& last, LLUUID& id);
    bool getUUID(const std::string& fullname, LLUUID& id);

    // IDEVO Temporary code
    // Clean up new-style "bobsmith123 Resident" names to "bobsmith123" for display
    static std::string buildFullName(const std::string& first, const std::string& last);

    // Clean up legacy "bobsmith123 Resident" to "bobsmith123"
    // If name does not contain "Resident" returns it unchanged.
    static std::string cleanFullName(const std::string& full_name);

    // Converts a standard legacy name to a username
    // "bobsmith123 Resident" -> "bobsmith"
    // "Random Linden" -> "random.linden"
    static std::string buildUsername(const std::string& name);

    // Converts a complete display name to a legacy name
    // if possible, otherwise returns the input
    // "Alias (random.linden)" -> "Random Linden"
    // "Something random" -> "Something random"
    static std::string buildLegacyName(const std::string& name);

    // If available, this method copies the group name into the string
    // provided. The caller must allocate at least
    // DB_GROUP_NAME_BUF_SIZE characters. If not available, this
    // method copies the string "waiting". Returns true if available.
    bool getGroupName(const LLUUID& id, std::string& group);

    // Call the callback with the group or avatar name.
    // If the data is currently available, may call the callback immediatly
    // otherwise, will request the data, and will call the callback when
    // available.  There is no garuntee the callback will ever be called.
    boost::signals2::connection get(const LLUUID& id, bool is_group, const LLCacheNameCallback& callback);

    // Convenience method for looking up a group name, so you can
    // tell the difference between avatar lookup and group lookup
    // in global searches
    boost::signals2::connection getGroup(const LLUUID& group_id, const LLCacheNameCallback& callback);

    // LEGACY
    boost::signals2::connection get(const LLUUID& id, bool is_group, old_callback_t callback, void* user_data);
    // This method needs to be called from time to time to send out
    // requests.
    void processPending();

    // Expire entries created more than "secs" seconds ago.
    void deleteEntriesOlderThan(S32 secs);

    // Debugging
    void dump();        // Dumps the contents of the cache
    void dumpStats();   // Dumps the sizes of the cache and associated queues.
    void clear();       // Deletes all entries from the cache

    std::string getDefaultName();

    // Returns "Resident", the default last name for SLID-based accounts
    // that have no last name.
    static std::string getDefaultLastName();

    void localizeCacheName(std::string key, std::string value);

private:
    std::map<std::string, std::string> mCacheName;

    class Impl;
    Impl& impl;
};



extern LLCacheName* gCacheName;

#endif