/*
 * ============================================================================
 *
 *  Zombie:Reloaded
 *
 *  File:          zspawn.inc
 *  Type:          Module
 *  Description:   Handles zspawn command, spawns late-joining clients into the game.
 *
 *  Copyright (C) 2009  Greyscale, Richard Helgeby
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * ============================================================================
 */

/**
 * Global variable to store infect timer handle.
 */
new Handle:tZSpawn = INVALID_HANDLE;

/**
 * Global variable to store SteamID cache handle.
 */
new Handle:g_hZSpawnSteamIDCache = INVALID_HANDLE;

/**
 * Create commands specific to ZSpawn.
 */
ZSpawnOnCommandsCreate()
{
    // Register ZSpawn command.
    RegConsoleCmd(SAYHOOKS_KEYWORD_ZSPAWN, ZSpawnCommand, "Spawn into the game after joining late.");
    
    // Register admin command to force ZSpawn.
    RegAdminCmd("zr_zspawn_force", ZSpawnForceCommand, ADMFLAG_GENERIC, "Force ZSpawn on a client. Usage: zr_zspawn_force <client> ['0' = Spawn as human | '1' = Spawn as zombie]");
}

/**
 * Map is starting.
 */
ZSpawnOnMapStart()
{
    // Reset timer handle.
    tZSpawn = INVALID_HANDLE;
    
    // If SteamID cache hasn't been created yet, then create.
    if (g_hZSpawnSteamIDCache == INVALID_HANDLE)
    {
        g_hZSpawnSteamIDCache = SteamidCacheCreate();
    }
    
    // Reset the SteamID cache.
    SteamidCacheReset(g_hZSpawnSteamIDCache);
}

/**
 * Client is leaving the server.
 * 
 * @param client    The client index.
 */
ZSpawnOnClientDisconnect(client)
{
    // So people who are connecting that click "cancel" aren't added to the list.
    if (!IsClientInGame(client))
    {
        return;
    }
    
    // Check if client is a bot.
    if (IsFakeClient(client))
    {
        return;
    }
    
    // Add client to the SteamID cache.
    SteamidCacheAddClient(g_hZSpawnSteamIDCache, client);
}

/**
 * Client has been killed.
 * 
 * @param client    The client index.
 */
ZSpawnOnClientDeath(client)
{
    // Add client to the SteamID cache.
    SteamidCacheAddClient(g_hZSpawnSteamIDCache, client);
}

/**
 * The round is starting.
 */
ZSpawnOnRoundStart()
{
    // Reset the SteamID cache.
    SteamidCacheReset(g_hZSpawnSteamIDCache);
    
    // If zspawn timer is running, then kill it.
    if (tZSpawn != INVALID_HANDLE)
    {
        // Kill timer.
        KillTimer(tZSpawn);
        
        // Reset timer handle.
        tZSpawn = INVALID_HANDLE;
    }
}

/**
 * The freeze time is ending.
 */
ZSpawnOnRoundFreezeEnd()
{
    // If infect timer is running, then kill it.
    if (tZSpawn != INVALID_HANDLE)
    {
        // Kill timer.
        KillTimer(tZSpawn);
    }
    
    // If zspawn is disabled, then stop.
    new bool:zspawn = GetConVarBool(g_hCvarsList[CVAR_ZSPAWN]);
    if (!zspawn)
    {
        return;
    }
    
    // If timelimit is disabled, then stop.
    new bool:zspawntimelimit = GetConVarBool(g_hCvarsList[CVAR_ZSPAWN_TIMELIMIT]);
    if (!zspawntimelimit)
    {
        return;
    }
    
    // Get timelimit
    new Float:zspawntime = GetConVarFloat(g_hCvarsList[CVAR_ZSPAWN_TIMELIMIT_TIME]);
    
    // Start timer.
    tZSpawn = CreateTimer(zspawntime, ZSpawnTimer, _, TIMER_FLAG_NO_MAPCHANGE);
}

/**
 * The round is ending.
 */
ZSpawnOnRoundEnd()
{
    // If zspawn timer is running, then kill it.
    if (tZSpawn != INVALID_HANDLE)
    {
        // Kill timer.
        KillTimer(tZSpawn);
        
        // Reset timer handle.
        tZSpawn = INVALID_HANDLE;
    }
}

/**
 * Spawns a late-joining client into the game.
 * 
 * @param client    The client index.
 * @param force     (Optional) True to force spawning of the client, false to follow rules.
 * @param zombie    (Optional) If you are forcing spawn, you must override the team here.
 * @return          True if successful, false otherwise.
 */
bool:ZSpawnClient(client, bool:force = false, bool:zombie = false)
{
    // If zspawn is disabled, then stop.
    new bool:zspawn = GetConVarBool(g_hCvarsList[CVAR_ZSPAWN]);
    if (!force && !zspawn)
    {
        TranslationPrintToChat(client, "Feature is disabled");
        return false;
    }
    
    // If client isn't on a team, then stop.
    if (!ZRIsClientOnTeam(client))
    {
        if (!force)
        {
            // Tell client the command may only be used when on a team.
            TranslationPrintToChat(client, "Must be on team");
        }
        
        return false;
    }
    
    // If client is alive, then stop.
    if (IsPlayerAlive(client))
    {
        if (!force)
        {
            // Tell client the command may only be used when dead.
            TranslationPrintToChat(client, "Must be dead");
        }
        
        return false;
    }
    
    // Block if client has already played during this round.
    if (!force && SteamidCacheClientExists(g_hZSpawnSteamIDCache, client))
    {
        // Tell client the command may only be used when joining late.
        TranslationPrintToChat(client, "ZSpawn double spawn");
        return false;
    }
    
    new bool:teamzombie;
    
    if (!force)
    {
        // Check if zspawn override is enabled, and if so get overidden value.
        new bool:teamoverride = GetConVarBool(g_hCvarsList[CVAR_ZSPAWN_TEAM_OVERRIDE]);
        teamzombie = teamoverride ? GetConVarBool(g_hCvarsList[CVAR_ZSPAWN_TEAM_ZOMBIE]) : GetConVarBool(g_hCvarsList[CVAR_RESPAWN_TEAM_ZOMBIE]);
        
        // Block is the time limit is up.
        new bool:zspawntimelimit = GetConVarBool(g_hCvarsList[CVAR_ZSPAWN_TIMELIMIT]);
        if (zspawntimelimit)
        {
            if (tZSpawn == INVALID_HANDLE)
            {
                new zspawntimelimitzombie = GetConVarInt(g_hCvarsList[CVAR_ZSPAWN_TIMELIMIT_ZOMBIE]);
                switch(zspawntimelimitzombie)
                {
                    case -1:
                    {
                        // Get timelimit
                        new Float:zspawntime = GetConVarFloat(g_hCvarsList[CVAR_ZSPAWN_TIMELIMIT_TIME]);
                        
                        // Tell client the timelimit for this command has expired.
                        TranslationPrintToChat(client, "ZSpawn timelimit", RoundToNearest(zspawntime));
                        return false;
                    }
                    case 0:
                    {
                        teamzombie = false;
                    }
                    case 1:
                    {
                        teamzombie = true;
                    }
                }
            }
        }
    }
    else
    {
        // Use the override team in the function if were forcing the spawn.
         teamzombie = zombie;
    }
    
    // Tell respawn module to respawn client.
    RespawnSpawnClient(client, teamzombie);
    
    return true;
}

/**
 * Menu callback (zspawn_force)
 * Forces ZSpawn on a client.
 * 
 * @param menu      The menu handle.
 * @param action    Action client is doing in menu.
 * @param client    The client index.
 * @param slot      The menu slot selected. (starting from 0)
 */
public ZSpawnForceHandle(Handle:menu_zspawn_force, MenuAction:action, client, slot)
{
    // Client selected an option.
    if (action == MenuAction_Select)
    {
        // Get the client index of the selected client.
        new target = MenuGetClientIndex(menu_zspawn_force, slot);
        
        // Get the target's name for future use.
        decl String:targetname[MAX_NAME_LENGTH];
        GetClientName(target, targetname, sizeof(targetname));
        
        // Force ZSpawn on the target.
        new bool:success = ZSpawnClient(target, true);
        
        // Tell admin the outcome of the action.
        if (success)
        {
            TranslationReplyToCommand(client, "ZSpawn command force successful", targetname);
        }
        else
        {
            TranslationReplyToCommand(client, "ZSpawn command force unsuccessful", targetname);
        }
        
        // Re-send the menu.
        MenuClientList(client, ZSpawnForceHandle, "ZSpawn clients title");
    }
    // Client closed the menu.
    if (action == MenuAction_Cancel)
    {
        // Client hit "Back" button.
        if (slot == MenuCancel_ExitBack)
        {
            // Re-open admin menu.
            ZAdminMenu(client);
        }
    }
    // Client exited menu.
    if (action == MenuAction_End)
    {
        CloseHandle(menu_zspawn_force);
    }
}

/**
 * Command callback (zspawn)
 * Spawn into the game after joining late.
 * 
 * @param client    The client index.
 * @param argc      Argument count.
 */
public Action:ZSpawnCommand(client, argc)
{
    // If client is console, then stop and tell them this feature is for players only.
    if (ZRIsConsole(client))
    {
        TranslationPrintToServer("Must be player");
        return Plugin_Handled;
    }
    
    // Spawn client.
    ZSpawnClient(client);
    
    // This stops the "Unknown command" message in client's console.
    return Plugin_Handled;
}

/**
 * Command callback (zr_zspawn_force)
 * Force ZSpawn on a client.
 * 
 * @param client    The client index.
 * @param argc      Argument count.
 */
public Action:ZSpawnForceCommand(client, argc)
{
    // If not enough arguments given, then stop.
    if (argc < 1)
    {
        TranslationReplyToCommand(client, "ZSpawn command force syntax");
        return Plugin_Handled;
    }
    
    decl String:target[MAX_NAME_LENGTH], String:targetname[MAX_NAME_LENGTH];
    new targets[MAXPLAYERS], bool:tn_is_ml, result;
    
    // Get targetname.
    GetCmdArg(1, target, sizeof(target));
    
    // Find a target.
    result = ProcessTargetString(target, client, targets, sizeof(targets), COMMAND_FILTER_DEAD, targetname, sizeof(targetname), tn_is_ml);
        
    // Check if there was a problem finding a client.
    if (result <= 0)
    {
        ZRReplyToTargetError(client, result);
        return Plugin_Handled;
    }
    
    // Get item to give to client.
    decl String:strZombie[4];
    GetCmdArg(2, strZombie, sizeof(strZombie));
    
    // Copy value of second (optional) parameter to 'zombie'.
    // It will be false if the parameter wasn't specified.
    new bool:zombie = bool:StringToInt(strZombie);
    
    // x = Client index.
    for (new x = 0; x < result; x++)
    {
        // Give client the item.
        new bool:success = ZSpawnClient(targets[x], true, zombie);
        
        // Tell admin the outcome of the command if only 1 client was targetted.
        if (result == 1)
        {
            if (success)
            {
                TranslationReplyToCommand(client, "ZSpawn command force successful", targetname);
            }
            else
            {
                TranslationReplyToCommand(client, "ZSpawn command force unsuccessful", targetname);
            }
        }
    }
    
    // Log action to game events.
    LogEvent(false, LogType_Normal, LOG_GAME_EVENTS, LogModule_ZSpawn, "Force ZSpawn", "Admin \"%L\" forced player(s) to spawn. (zr_zspawn_force)", client);
    
    return Plugin_Handled;
}

/**
 * Timer callback, resets handle.
 * 
 * @param timer     The timer handle.
 */
public Action:ZSpawnTimer(Handle:timer)
{
    // Reset timer handle.
    tZSpawn = INVALID_HANDLE;
}