Auto-Balance v2 for Phasor v2+

--[[ ###  Team Balance and Auto-Balance v2  ###]]--
--[[ ###     by H® Shaft for Phasor v2+     ###]]--

-- EDITED 7/19/2014 corrected small error. If you downloaded before this date, you need to download it again.
-- autobalances teams during team games if there are 4 or more players
-- occurs automatically on player leave and join
-- any player may type 'balance' to balance the teams if not willing to wait

-- edit --
autobal_delay = 15  --| Time in seconds to delay balancing teams during the game and when players join or leave
                    --| you should not go lower than 10 seconds, to allow admins to switch players manually if they choose

-- don't edit --
cur_players = 0
team_change = {}
team_play = false
game_started = false
game_autobal = nil
map_reset = false

function GetRequiredVersion()
    return 200
end

function OnScriptLoad(process, game, persistent)
    if game == "PC" then
        gametype_base = 0x671340
        network_base = 0x745BA8
    else
        gametype_base = 0x5F5498
        network_base = 0x6C7988
    end

    GAME = game
    team_play = getteamplay()
    cur_players = readword(network_base, 0x1A0)
    ScriptLoad()

    if not game_started and cur_players > 0 then game_started = true end

    if team_play and game_autobal == nil then
        game_autobal = registertimer(autobal_delay * 1000, "AutoBalance")
    end

end

function ScriptLoad()
    if map_reset == true then
        map_reset = false
        team_play = getteamplay()

        for i = 0,15 do
            if getplayer(i) then
                cur_players = cur_players + 1
                team_change[i] = false
            end
        end

        if not game_started and cur_players > 0 then game_started = true end

        if team_play and game_autobal == nil then
            game_autobal = registertimer(autobal_delay * 1000, "AutoBalance")
        end
    end
end

function OnNewGame(map)
    if game == "PC" or GAME == "PC" then
        gametype_base = 0x671340
        network_base = 0x745BA8
    else
        gametype_base = 0x5F5498
        network_base = 0x6C7988
    end

    team_play = getteamplay()
    cur_players = readword(network_base, 0x1A0)
    game_started = true

    if not game_started and cur_players > 0 then game_started = true end

    if team_play and game_autobal == nil then
        game_autobal = registertimer(autobal_delay * 1000, "AutoBalance")
    end
end

function OnPlayerJoin(player)
    if getplayer(player) then
        cur_players = cur_players + 1
        team_change[player] = false
        if game_started and team_play and cur_players > 3 then
            join_autobal = registertimer(autobal_delay * 1000, "AutoBalance")
        end
        if team_play and cur_players > 3 and game_autobal == nil then
            game_autobal = registertimer(autobal_delay * 1000, "AutoBalance")
        end
    end
end

function OnPlayerLeave(player)
    if getplayer(player) then
        cur_players = cur_players - 1
        team_change[player] = {}
        if game_started and team_play and cur_players > 3 then
            leave_autobal = registertimer(autobal_delay * 1000, "AutoBalance")
        end
        if team_play and cur_players < 4 and game_autobal then
            game_autobal = nil
        elseif team_play and cur_players > 3 and game_autobal == nil then
            game_autobal = registertimer(autobal_delay * 1000, "AutoBalance")
        end
    end
end

function getteamplay()
    if readbyte(gametype_base + 0x34) == 1 then
        return true
    else
        return false
    end
end

function OnServerChat(player, type, message)
    local response = nil

    if player then
        if string.lower(message) == "balance" then
            Balance_Teams()
            response = false
        end
    end

    return response
end

function OnPlayerKill(killer, victim, mode)
    local response = nil

    if game_started then
        if mode == 1 then -- player was killed by falling or team-change
            if getplayer(victim) then
                if not team_change[victim] then
                    response = true  -- player fell and died, show death message
                else
                    team_change[victim] = false
                    response = false -- player changed teams, don't show death message
                end
            end
        end
    end

    return response
end

function AutoBalance(id, count)
    if game_started and team_play and cur_players > 3 then
        Balance_Teams()
        if join_autobal then join_autobal = nil end
        if leave_autobal then leave_autobal = nil end
        return true
    elseif game_started and team_play and cur_players < 4 then
        return false
    else
        return false
    end
end

-- inspired by 002's team balance for Sapp
function Balance_Teams()
    if game_started and team_play then
        local redteam = getteamsize(0)
        local blueteam = getteamsize(1)
        if redteam > blueteam then
            while TeamsAreUneven() do
                while (getteamsize(0) > getteamsize(1)+1) do
                    local randomred = SelectPlayer(0)
                    if randomred ~= nil then
                        changeteam(randomred, true)
                    end
                end
            end
        elseif blueteam > redteam then
            while TeamsAreUneven() do
                while (getteamsize(1) > getteamsize(0)+1) do
                    local randomblu = SelectPlayer(1)
                    if randomblu ~= nil then
                        changeteam(randomblu, true)
                    end
                end
            end
        end
    end
end

-- inspired by 002's team balance for Sapp
function TeamsAreUneven()
    local red = getteamsize(0)
    local blue = getteamsize(1)
    if (red > blue + 1 or blue > red + 1) then return true end
    return false
end

function SelectPlayer(team)
    local t = {}
    for i=0,15 do
        if getplayer(i) and getteam(i) == team then
            table.insert(t, i)
        end
    end
    if #t > 0 then
        local r = getrandomnumber(1, #t+1)
        return t[r]
    end
    return nil
end

function OnTeamChange(player, old_team, new_team, relevant)
    -- prevent unbalancing teams by team change
    local response = nil
    if getplayer(player) then

        local newteam = "New Team"
        local oldteam = "Old Team"

        if not team_play then response = false return response end

        if new_team == 0 then
            newteam = "Red Team"
        elseif new_team == 1 then
            newteam = "Blue Team"
        end

        if relevant == true or relevant == 1 then
            if getteamsize(old_team) == getteamsize(new_team) then
                privatesay(player, "You cannot change teams.")
                response = false
            elseif getteamsize(old_team) + 1 == getteamsize(new_team) then
                privatesay(player, "You cannot change teams.")
                response = false
            elseif getteamsize(old_team) == getteamsize(new_team) + 1 then
                privatesay(player, "You cannot change teams.")
                response = false
            elseif getteamsize(old_team) > getteamsize(new_team) then
                team_change[player] = true
                say(getname(player) .. " switched to the "  .. newteam)
                response = true
            elseif getteamsize(old_team) < getteamsize(new_team) then
                team_change[player] = true
                say(getname(player) .. " switched to the "  .. newteam)
                response = true
            end
        elseif relevant == false or relevant == 0 then
            team_change[player] = true
            say(getname(player) .. " was team-switched to balance the teams.")
            response = true
        end

    end

    return response
end

function OnServerCommand(player, command)
    local allow = nil
    local cmd = tokenizecmdstring(command)
    local tokencount = #cmd
    if tokencount > 0 then

        if cmd[1] == "sv_map_reset" then
            map_reset = true
            ScriptLoad()
            allow = true

        elseif cmd[1] == "sv_script_reload" then
            map_reset = true
            ScriptLoad()
            allow = true
        end

    end
    return allow
end

function OnGameEnd(stage)
    if stage == 1 then
        game_started = false
        if game_autobal then
            game_autobal = nil
        end
        if join_autobal then
            join_autobal = nil
        end
        if leave_autobal then
            leave_autobal = nil
        end
    end
end

--[[ Created by H® Shaft.
Thanks to Oxide, AelitePrime, Nugget & Wizard -- and 002
Visit http://halorace.org/forum/index.php?topic=514.0 or
Visit http://pastebin.com/u/HR_Shaft for more phasor scripts
]]