//====== Copyright © 1996-2008, Valve Corporation, All rights reserved. =======
//
// Purpose: interface to both friends list data and general information about users
//
//=============================================================================

#ifndef ISTEAMFRIENDS_H
#define ISTEAMFRIENDS_H
#ifdef _WIN32
#pragma once
#endif

#include "isteamclient.h"

//-----------------------------------------------------------------------------
// Purpose: set of relationships to other users
//-----------------------------------------------------------------------------
enum EFriendRelationship
{
	k_EFriendRelationshipNone = 0,
	k_EFriendRelationshipBlocked = 1,
	k_EFriendRelationshipRequestRecipient = 2,
	k_EFriendRelationshipFriend = 3,
	k_EFriendRelationshipRequestInitiator = 4,
	k_EFriendRelationshipIgnored = 5,
	k_EFriendRelationshipIgnoredFriend = 6,
};


//-----------------------------------------------------------------------------
// Purpose: list of states a friend can be in
//-----------------------------------------------------------------------------
enum EPersonaState
{
	k_EPersonaStateOffline = 0,			// friend is not currently logged on
	k_EPersonaStateOnline = 1,			// friend is logged on
	k_EPersonaStateBusy = 2,			// user is on, but busy
	k_EPersonaStateAway = 3,			// auto-away feature
	k_EPersonaStateSnooze = 4,			// auto-away for a long time
	k_EPersonaStateMax,
};


//-----------------------------------------------------------------------------
// Purpose: flags for enumerating friends list, or quickly checking a the relationship between users
//-----------------------------------------------------------------------------
enum k_EFriendFlags
{
	k_EFriendFlagNone			= 0x00,
	k_EFriendFlagBlocked		= 0x01,
	k_EFriendFlagFriendshipRequested	= 0x02,
	k_EFriendFlagImmediate		= 0x04,			// "regular" friend
	k_EFriendFlagClanMember		= 0x08,
	k_EFriendFlagOnGameServer	= 0x10,	
	// k_EFriendFlagHasPlayedWith	= 0x20,	// not currently used
	// k_EFriendFlagFriendOfFriend	= 0x40, // not currently used
	k_EFriendFlagRequestingFriendship = 0x80,
	k_EFriendFlagRequestingInfo = 0x100,
	k_EFriendFlagIgnored		= 0x200,
	k_EFriendFlagIgnoredFriend	= 0x400,
	k_EFriendFlagAll			= 0xFFFF,
};

// maximum number of characters in a users name
enum { k_cchPersonaNameMax = 128 };

// size limit on chat room or member metadata
const uint32 k_cubChatMetadataMax = 4096;

//-----------------------------------------------------------------------------
// Purpose: interface to accessing information about individual users,
//			that can be a friend, in a group, on a game server or in a lobby with the local user
//-----------------------------------------------------------------------------
class ISteamFriends
{
public:
	// returns the local players name - guaranteed to not be NULL.
	// this is the same name as on the users community profile page
	// this is stored in UTF-8 format
	// like all the other interface functions that return a char *, it's important that this pointer is not saved
	// off; it will eventually be free'd or re-allocated
	virtual const char *GetPersonaName() = 0;
	
	// sets the player name, stores it on the server and publishes the changes to all friends who are online
	virtual void SetPersonaName( const char *pchPersonaName ) = 0;

	// gets the status of the current user
	virtual EPersonaState GetPersonaState() = 0;

	virtual void SetPersonaState( EPersonaState ePersonaState ) = 0;

	// friend iteration
	// takes a set of k_EFriendFlags, and returns the number of users the client knows about who meet that criteria
	// then GetFriendByIndex() can then be used to return the id's of each of those users
	virtual int GetFriendCount( int iFriendFlags ) = 0;

	// returns the steamID of a user
	// iFriend is a index of range [0, GetFriendCount())
	// iFriendsFlags must be the same value as used in GetFriendCount()
	// the returned CSteamID can then be used by all the functions below to access details about the user
	virtual CSteamID GetFriendByIndex( int iFriend, int iFriendFlags ) = 0;

	// returns a relationship to a user
	virtual EFriendRelationship GetFriendRelationship( CSteamID steamIDFriend ) = 0;

	// returns the current status of the specified user
	// this will only be known by the local user if steamIDFriend is in their friends list; on the same game server; in a chat room or lobby; or in a small group with the local user
	virtual EPersonaState GetFriendPersonaState( CSteamID steamIDFriend ) = 0;

	// returns the name another user - guaranteed to not be NULL.
	// same rules as GetFriendPersonaState() apply as to whether or not the user knowns the name of the other user
	// note that on first joining a lobby, chat room or game server the local user will not known the name of the other users automatically; that information will arrive asyncronously
	// 
	virtual const char *GetFriendPersonaName( CSteamID steamIDFriend ) = 0;

	virtual void SetFriendRegValue( CSteamID steamIDFriend, const char *pchKey, const char *pchValue ) = 0;
	virtual const char *GetFriendRegValue( CSteamID steamIDFriend, const char *pchKey ) = 0;

	// returns true if the friend is actually in a game
	virtual bool GetFriendGamePlayed( CSteamID steamIDFriend, uint64 *pulGameID, uint32 *punGameIP, uint16 *pusGamePort, uint16 *pusQueryPort ) = 0;
	// accesses old friends names - returns an empty string when their are no more items in the history
	virtual const char *GetFriendPersonaNameHistory( CSteamID steamIDFriend, int iPersonaName ) = 0;

	// returns true if the specified user meets any of the criteria specified in iFriendFlags
	// iFriendFlags can be the union (binary or, |) of one or more k_EFriendFlags values
	virtual bool AddFriend( CSteamID steamIDFriend ) = 0;
	virtual bool RemoveFriend( CSteamID steamIDFriend ) = 0;
	virtual bool HasFriend( CSteamID steamIDFriend, int iFriendFlags ) = 0;

	virtual int32 AddFriendByName( const char *pchEmailOrAccountName ) = 0;
	virtual bool InviteFriendByEmail( const char *pchEmailAccount ) = 0;
	virtual int GetChatMessage( CSteamID steamIDFriend, int iChatID, void *pvData, int cubData, EChatEntryType *peChatEntryType ) = 0;
	virtual bool SendMsgToFriend( CSteamID steamIDFriend, EChatEntryType eChatEntryType, const void *pvMsgBody, int cubMsgBody ) = 0;
	virtual int GetChatIDOfChatHistoryStart( CSteamID steamIDFriend ) = 0;
	virtual void SetChatHistoryStart( CSteamID steamIDFriend, int iChatID ) = 0;
	virtual void ClearChatHistory( CSteamID steamIDFriend ) = 0;

	// clan (group) iteration and access functions
	virtual int GetClanCount() = 0;
	virtual CSteamID GetClanByIndex( int iClan ) = 0;
	virtual const char *GetClanName( CSteamID steamIDClan ) = 0;

	virtual bool InviteFriendToClan( CSteamID steamIDFriend, CSteamID steamIDClan ) = 0;
	virtual bool AcknowledgeInviteToClan( CSteamID steamIDClan, bool bAcceptOrDenyClanInvite ) = 0;

	// iterators for getting users in a chat room, lobby, game server or clan
	// note that large clans that cannot be iterated by the local user
	// steamIDSource can be the steamID of a group, game server, lobby or chat room
	virtual int GetFriendCountFromSource( CSteamID steamIDSource ) = 0;
	virtual CSteamID GetFriendFromSourceByIndex( CSteamID steamIDSource, int iFriend ) = 0;
};

#define STEAMFRIENDS_INTERFACE_VERSION "SteamFriends002"

//-----------------------------------------------------------------------------
// Purpose: called when a friends' status changes
//-----------------------------------------------------------------------------
struct PersonaStateChange_t
{
	enum { k_iCallback = k_iSteamFriendsCallbacks + 4 };
	
	uint64 m_ulSteamID;		// steamID of the friend who changed
	int m_nChangeFlags;		// what's changed
};


// used in PersonaStateChange_t::m_nChangeFlags to describe what's changed about a user
// these flags describe what the client has learned has changed recently, so on startup you'll see a name, avatar & relationship change for every friend
enum EPersonaChange
{
	k_EPersonaChangeName		= 0x001,
	k_EPersonaChangeStatus		= 0x002,
	k_EPersonaChangeComeOnline	= 0x004,
	k_EPersonaChangeGoneOffline	= 0x008,
	k_EPersonaChangeGamePlayed	= 0x010,
	k_EPersonaChangeGameServer	= 0x020,
	k_EPersonaChangeAvatar		= 0x040,
	k_EPersonaChangeJoinedSource= 0x080,
	k_EPersonaChangeLeftSource	= 0x100,
	k_EPersonaChangeRelationshipChanged = 0x200,
	k_EPersonaChangeNameFirstSet = 0x400,
};


//-----------------------------------------------------------------------------
// Purpose: posted when game overlay activates or deactivates
//			the game can use this to be pause or resume single player games
//-----------------------------------------------------------------------------
struct GameOverlayActivated_t
{
	enum { k_iCallback = k_iSteamFriendsCallbacks + 31 };
	uint8 m_bActive;	// true if it's just been activated, false otherwise
};


//-----------------------------------------------------------------------------
// Purpose: called when the user tries to join a different game server from their friends list
//			game client should attempt to connect to specified server when this is received
//-----------------------------------------------------------------------------
struct GameServerChangeRequested_t
{
	enum { k_iCallback = k_iSteamFriendsCallbacks + 32 };
	char m_rgchServer[64];		// server address ("127.0.0.1:27015", "tf2.valvesoftware.com")
	char m_rgchPassword[64];	// server password, if any
};

#endif // ISTEAMFRIENDS_H