/*
**
** Server Hop (c) 2009, 2010 [GRAVE] rig0r
**       www.gravedigger-company.nl
**
*/

#include <sourcemod>
#include <socket>

#define PLUGIN_VERSION "0.8.1"
#define MAX_SERVERS 32
#define REFRESH_TIME 60.0
#define SERVER_TIMEOUT 10.0
#define MAX_STR_LEN 160
#define MAX_INFO_LEN 200
//#define DEBUG

new serverCount = 0;
new advertCount = 0;
new advertInterval = 1;
new String:serverName[MAX_SERVERS][MAX_STR_LEN];
new String:serverAddress[MAX_SERVERS][MAX_STR_LEN];
new serverPort[MAX_SERVERS];
new String:serverInfo[MAX_SERVERS][MAX_INFO_LEN];
new Handle:socket[MAX_SERVERS];
new bool:socketError[MAX_SERVERS];

new Handle:cv_hoptrigger = INVALID_HANDLE
new Handle:cv_serverformat = INVALID_HANDLE
new Handle:cv_broadcasthops = INVALID_HANDLE
new Handle:cv_advert = INVALID_HANDLE
new Handle:cv_advert_interval = INVALID_HANDLE

public Plugin:myinfo =
{
  name = "Server Hop",
  author = "[GRAVE] rig0r",
  description = "Provides live server info with join option",
  version = PLUGIN_VERSION,
  url = "http://www.gravedigger-company.nl"
};

public OnPluginStart()
{
  LoadTranslations( "serverhop.phrases" );

  // convar setup
  cv_hoptrigger = CreateConVar( "sm_hop_trigger",
                                "!servers",
                                "What players have to type in chat to activate the plugin (besides !hop)" );
  cv_serverformat = CreateConVar( "sm_hop_serverformat",
                                  "%name - %map (%numplayers/%maxplayers)",
                                  "Defines how the server info should be presented" );
  cv_broadcasthops = CreateConVar( "sm_hop_broadcasthops",
                                   "1",
                                   "Set to 1 if you want a broadcast message when a player hops to another server" );
  cv_advert = CreateConVar( "sm_hop_advertise",
                            "1",
                            "Set to 1 to enable server advertisements" );
  cv_advert_interval = CreateConVar( "sm_hop_advertisement_interval",
                                     "1",
                                     "Advertisement interval: advertise a server every x minute(s)" );

  AutoExecConfig( true, "plugin.serverhop" );
  
  new Handle:timer = CreateTimer( REFRESH_TIME, RefreshServerInfo, _, TIMER_REPEAT );

  RegConsoleCmd( "say", Command_Say );
  RegConsoleCmd( "say_team", Command_Say );

  new String:path[MAX_STR_LEN];
  new Handle:kv;

  BuildPath( Path_SM, path, sizeof( path ), "configs/serverhop.cfg" );
  kv = CreateKeyValues( "Servers" );

  if ( !FileToKeyValues( kv, path ) )
    LogToGame( "Error loading server list" );

  new i;
  KvRewind( kv );
  KvGotoFirstSubKey( kv );
  do {
    KvGetSectionName( kv, serverName[i], MAX_STR_LEN );
    KvGetString( kv, "address", serverAddress[i], MAX_STR_LEN );
    serverPort[i] = KvGetNum( kv, "port", 27015 );
    i++;
  } while ( KvGotoNextKey( kv ) );
  serverCount = i;

  TriggerTimer( timer );
}

public Action:Command_Say( client, args )
{
  new String:text[MAX_STR_LEN];
  new startidx = 0;

  if ( !GetCmdArgString( text, sizeof( text ) ) ) {
    return Plugin_Continue;
  }

  if ( text[strlen( text) - 1] == '"' ) {
    text[strlen( text )-1] = '\0';
    startidx = 1;
  }

  new String:trigger[MAX_STR_LEN];
  GetConVarString( cv_hoptrigger, trigger, sizeof( trigger ) );

  if ( strcmp( text[startidx], trigger, false ) == 0 || strcmp( text[startidx], "!hop", false ) == 0 ) {
    ServerMenu( client );
  }

  return Plugin_Continue;
}

public Action:ServerMenu( client )
{
  new Handle:menu = CreateMenu( MenuHandler );
  new String:serverNumStr[MAX_STR_LEN];
  new String:menuTitle[MAX_STR_LEN];
  Format( menuTitle, sizeof( menuTitle ), "%T", "SelectServer", client );
  SetMenuTitle( menu, menuTitle );

  for ( new i = 0; i < serverCount; i++ ) {
    if ( strlen( serverInfo[i] ) > 0 ) {
      #if defined DEBUG then
        PrintToConsole( client, serverInfo[i] );
      #endif
      IntToString( i, serverNumStr, sizeof( serverNumStr ) );
      AddMenuItem( menu, serverNumStr, serverInfo[i] );
    }
  } 
  DisplayMenu( menu, client, 20 );
}

public MenuHandler( Handle:menu, MenuAction:action, param1, param2 )
{
  if ( action == MenuAction_Select ) {
    new String:infobuf[MAX_STR_LEN];
    new String:address[MAX_STR_LEN];

    GetMenuItem( menu, param2, infobuf, sizeof( infobuf ) );
    new serverNum = StringToInt( infobuf );

    // header
    new Handle:kvheader = CreateKeyValues( "header" );
    new String:menuTitle[MAX_STR_LEN];
    Format( menuTitle, sizeof( menuTitle ), "%T", "AboutToJoinServer", param1 );
    KvSetString( kvheader, "title", menuTitle );
    KvSetNum( kvheader, "level", 1 );
    KvSetString( kvheader, "time", "10" );
    CreateDialog( param1, kvheader, DialogType_Msg );
    CloseHandle( kvheader );
    
    // join confirmation dialog
    new Handle:kv = CreateKeyValues( "menu" );
    KvSetString( kv, "time", "10" );
    Format( address, MAX_STR_LEN, "%s:%i", serverAddress[serverNum], serverPort[serverNum] );
    KvSetString( kv, "title", address );
    CreateDialog( param1, kv, DialogType_AskConnect );
    CloseHandle( kv );

    // broadcast to all
    if ( GetConVarBool( cv_broadcasthops ) ) {
      new String:clientName[MAX_NAME_LENGTH];
      GetClientName( param1, clientName, sizeof( clientName ) );
      PrintToChatAll( "\x04[\x03hop\x04]\x01 %t", "HopNotification", clientName, serverInfo[serverNum] );
    }
  }
}

public Action:RefreshServerInfo( Handle:timer )
{
  for ( new i = 0; i < serverCount; i++ ) {
    serverInfo[i] = "";
    socketError[i] = false;
    socket[i] = SocketCreate( SOCKET_UDP, OnSocketError );
    SocketSetArg( socket[i], i );
    SocketConnect( socket[i], OnSocketConnected, OnSocketReceive, OnSocketDisconnected, serverAddress[i], serverPort[i] );
  }

  CreateTimer( SERVER_TIMEOUT, CleanUp );
}

public Action:CleanUp( Handle:timer )
{
  for ( new i = 0; i < serverCount; i++ ) {
    if ( strlen( serverInfo[i] ) == 0 && !socketError[i] ) {
      LogError( "Server %s:%i is down: no timely reply received", serverAddress[i], serverPort[i] );
      CloseHandle( socket[i] );
    }
  }

  // all server info is up to date: advertise
  if ( GetConVarBool( cv_advert ) ) {
    if ( advertInterval == GetConVarFloat( cv_advert_interval ) ) {
      Advertise();
    }
    advertInterval++;
    if ( advertInterval > GetConVarFloat( cv_advert_interval ) ) {
      advertInterval = 1;
    }
  }
}

public Action:Advertise()
{
  new String:trigger[MAX_STR_LEN];
  GetConVarString( cv_hoptrigger, trigger, sizeof( trigger ) );

  // skip servers being marked as down
  while ( strlen( serverInfo[advertCount] ) == 0 ) {
    #if defined DEBUG then
      LogError( "Not advertising down server %i", advertCount );
    #endif
    advertCount++;
    if ( advertCount >= serverCount ) {
      advertCount = 0;
      break;
    }
  }

  if ( strlen( serverInfo[advertCount] ) > 0 ) {
    PrintToChatAll( "\x04[\x03hop\x04]\x01 %t", "Advert", serverInfo[advertCount], trigger );
    #if defined DEBUG then
      LogError( "Advertising server %i (%s)", advertCount, serverInfo[advertCount] );
    #endif

    advertCount++;
    if ( advertCount >= serverCount ) {
      advertCount = 0;
    }
  }
}

public OnSocketConnected( Handle:sock, any:i )
{
  decl String:requestStr[ 25 ];
  Format( requestStr, sizeof( requestStr ), "%s", "\xFF\xFF\xFF\xFF\x54Source Engine Query" );
  SocketSend( sock, requestStr, 25 );
}

GetByte( String:receiveData[], offset )
{
  return receiveData[offset];
}

String:GetString( String:receiveData[], dataSize, offset )
{
  decl String:serverStr[MAX_STR_LEN] = "";
  new j = 0;
  for ( new i = offset; i < dataSize; i++ ) {
    serverStr[j] = receiveData[i];
    j++;
    if ( receiveData[i] == '\x0' ) {
      break;
    }
  }
  return serverStr;
}

public OnSocketReceive( Handle:sock, String:receiveData[], const dataSize, any:i )
{
  new String:srvName[MAX_STR_LEN];
  new String:mapName[MAX_STR_LEN];
  new String:gameDir[MAX_STR_LEN];
  new String:gameDesc[MAX_STR_LEN];
  new String:numPlayers[MAX_STR_LEN];
  new String:maxPlayers[MAX_STR_LEN];

  // parse server info
  new offset = 2;
  srvName = GetString( receiveData, dataSize, offset );
  offset += strlen( srvName ) + 1;
  mapName = GetString( receiveData, dataSize, offset );
  offset += strlen( mapName ) + 1;
  gameDir = GetString( receiveData, dataSize, offset );
  offset += strlen( gameDir ) + 1;
  gameDesc = GetString( receiveData, dataSize, offset );
  offset += strlen( gameDesc ) + 1;
  offset += 2;
  IntToString( GetByte( receiveData, offset ), numPlayers, sizeof( numPlayers ) );
  offset++;
  IntToString( GetByte( receiveData, offset ), maxPlayers, sizeof( maxPlayers ) );

  new String:format[MAX_STR_LEN];
  GetConVarString( cv_serverformat, format, sizeof( format ) );
  ReplaceString( format, strlen( format ), "%name", serverName[i], false );
  ReplaceString( format, strlen( format ), "%map", mapName, false );
  ReplaceString( format, strlen( format ), "%numplayers", numPlayers, false );
  ReplaceString( format, strlen( format ), "%maxplayers", maxPlayers, false );

  serverInfo[i] = format;

  #if defined DEBUG then
    LogError( serverInfo[i] );
  #endif

  CloseHandle( sock );
}

public OnSocketDisconnected( Handle:sock, any:i )
{
  CloseHandle( sock );
}

public OnSocketError( Handle:sock, const errorType, const errorNum, any:i )
{
  LogError( "Server %s:%i is down: socket error %d (errno %d)", serverAddress[i], serverPort[i], errorType, errorNum );
  socketError[i] = true;
  CloseHandle( sock );
}