Taxi 1.1 for SAPP

-- Taxi 1.1 for SAPP by H® Shaft 1/4/2016, updated 7/20/2016, edited 8/6/2016 corrected line 296

-- Allows walking players to hitch a ride in a teammates vehicle.
-- To activate, just crouch! Or, type "Taxi" in the chat.
-- Best used with team race gametypes.

-- do not touch --
api_version = "1.9.0.0"
taxi, hails, set_seat, enable_taxi, enable_passenger = {}, {}, {}, {}, {}
taxi_delay = 2
game_started = false

function OnScriptLoad()
    register_callback(cb['EVENT_TICK'],"OnTaxiCall")
    register_callback(cb['EVENT_DIE'], "OnPlayerDeath")
    register_callback(cb['EVENT_JOIN'],"OnPlayerJoin")
    register_callback(cb['EVENT_LEAVE'],"OnPlayerLeave")
    register_callback(cb['EVENT_GAME_START'],"OnNewGame")
    register_callback(cb['EVENT_GAME_END'],"OnGameEnd")
    register_callback(cb['EVENT_CHAT'], "OnPlayerChat")
    LoadDefaults()
    if get_var(0, "$gt") ~= "n/a" then
        game_started = true
        for i=1,16 do
            if player_present(i) then
                hails[i], set_seat[i] = 0, {}
                local player_object = get_dynamic_player(i)
                if (player_object ~= 0) then
                    if isinvehicle(i) then
                        if read_byte(player_object + 0x2A0) == 0 then -- << driver
                            set_seat[i].seat = 0
                            set_seat[i].vehicle = read_dword(player_object + 0x11C)
                        elseif read_byte(player_object + 0x2A0) == 1 then -- << passenger
                            set_seat[i].seat = 1
                            set_seat[i].vehicle = read_dword(player_object + 0x11C)
                        elseif read_byte(player_object + 0x2A0) == 2 then -- << gunner
                            set_seat[i].seat = 2
                            set_seat[i].vehicle = read_dword(player_object + 0x11C)
                        end
                    end
                end
            end
        end
        map_name = get_var(1,"$map")
        enable_taxi[map_name] = enable_taxi[map_name] or false
        enable_passenger[map_name] = enable_passenger[map_name] or false
    end
end

function OnScriptUnload()
    taxi, hails, set_seat, enable_taxi = {}, {}, {}, {}
end

function OnPlayerJoin(PlayerIndex)
    if player_present(PlayerIndex) then
        hails[PlayerIndex], set_seat[PlayerIndex] = 0, {}
    end
end

function OnPlayerLeave(PlayerIndex)
    if player_present(PlayerIndex) then
        if set_seat[PlayerIndex].vehicle then
            if set_seat[PlayerIndex].seat == 1 then write_dword(set_seat[PlayerIndex].vehicle + 0x32C, 0xFFFFFFFF) end
        end
        set_seat[PlayerIndex] = {}
        set_seat[PlayerIndex] = nil
    end
end

function OnPlayerDeath(PlayerIndex, KillerIndex)
    if player_present(PlayerIndex) then
        if (game_started == true) then
            if set_seat[PlayerIndex].seat == 1 then
                write_dword(set_seat[PlayerIndex].vehicle + 0x32C, 0xFFFFFFFF)
            end
            set_seat[PlayerIndex] = {}
            set_seat[PlayerIndex].seat = nil
        end
    end
end

function OnVehicleEnter(PlayerIndex, Seat)
    if (game_started == true) then
        if player_present(PlayerIndex) then
            local player_object = get_dynamic_player(PlayerIndex)
            if (player_object ~= 0) then
                local player_object_id = read_dword(get_player(PlayerIndex) + 0x34)
                local vehicleId = read_dword(player_object + 0x11C)
                local veh_obj = get_object_memory(vehicleId)
                set_seat[PlayerIndex].seat = Seat
                set_seat[PlayerIndex].vehicle = read_dword(player_object + 0x11C)
                if Seat == "1" then
                    timer(0, "assignpassenger", {player_obj_id, veh_obj})
                end
            end
        end
    end
end

function OnVehicleEject(PlayerIndex)
    if (game_started == true) then
        if player_present(PlayerIndex) then
            local player_object = get_dynamic_player(PlayerIndex)
            local player_object_id = read_dword(get_player(PlayerIndex) + 0x34)
            if (player_object ~= 0) then
                if set_seat[PlayerIndex].seat == 1 then resetpassenger(PlayerIndex) end
                set_seat[PlayerIndex] = {}
                set_seat[PlayerIndex].seat = nil
            end
        end
    end
end

function OnNewGame()
    map_name = get_var(1,"$map")
    LoadDefaults()
    game_started = true
    enable_taxi[map_name] = enable_taxi[map_name] or false
    enable_passenger[map_name] = enable_passenger[map_name] or false
end

function OnGameEnd()
    game_started = false
end

-- associated with a key press, not a player animation state
function OnTaxiCall()
    for i=1,16 do
        if player_present(i) then
            local player_object = get_dynamic_player(i)
            if (player_object ~= 0) then
                if hails[i] > 0 then hails[i] = hails[i] - 1 end
                if not isinvehicle(i) then
                    local player_crouch = bit.band(read_dword(player_object + 0x208),7)
                    local id = i
                    if player_crouch == 1 and taxi[id] == nil then
                        taxi[id] = OnPlayerCrouch(id)
                    elseif player_crouch ~= 1 and taxi[id] ~= nil then
                        taxi[id] = nil
                    end
                end
            end
        end
    end
end

function OnPlayerCrouch(PlayerIndex)
    if (game_started == true) then
        if hails[PlayerIndex] == 0 then
            getTaxi(PlayerIndex)
            hails[PlayerIndex] = (taxi_delay*30)
        end
        return true
    else
        return false
    end
end

function OnPlayerChat(PlayerIndex, Message)
    local response = nil
    local name = get_var(PlayerIndex,"$name")
    local Message = string.lower(Message)

    if (Message == "taxi") or (Message == "/taxi") or (Message == "taxo") or (Message == "taxci") then
        response = false
        if player_present(PlayerIndex) then
            if (game_started == true) then
                if player_alive(PlayerIndex) then
                    if (enable_taxi[map_name] == true) then
                        if isinvehicle(PlayerIndex) then
                            say(PlayerIndex, "**Taxi** You are already in a vehicle.")
                        else
                            getTaxi(PlayerIndex)
                        end
                    else
                        say(PlayerIndex, "**Taxi** Is not enabled for this map.")
                    end
                else
                    say(PlayerIndex, "**Taxi** You are dead. Try again after you respawn.")
                end
            else
                say(PlayerIndex, "**Taxi** Please wait until the next map begins.")
            end
        end
    end

    return response
end

function getTaxi(PlayerIndex)
    local player2
    local team = get_var(PlayerIndex,"$team")
    for i=0,15 do
        if PlayerIndex ~= i and get_var(i,"$team") == team and isinvehicle(i) and checkSpaces(i, get_var(i,"$team"), GetplayerVehicleId(i)) > 0 then
            player2 = i
            break
        end
    end
    if player2 then
        InjectPlayer(PlayerIndex, GetplayerVehicleId(player2), true)
    else
        if (enable_taxi[map_name] == true) then
            say(PlayerIndex, "**Taxi** Sorry no taxi available. Please try again later.")
        end
    end
end

-- inserts selected player into selected vehicle
function InjectPlayer(PlayerIndex, m_vehicleId, count)
    if (player_alive(PlayerIndex) ~= true) then return false end
    local bool = false
    if player_alive(PlayerIndex) then
        local name = get_var(PlayerIndex,"$name")
        if m_vehicleId ~= false then
            local veh_obj = get_object_memory(m_vehicleId)
            local driver = read_dword(veh_obj + 0x324)
            local gunner = read_dword(veh_obj + 0x328)
            local passenger = read_dword(veh_obj + 0x32C)
            if driver == 0xFFFFFFFF then
                enter_vehicle(m_vehicleId, PlayerIndex, 0)
                bool = true
            elseif gunner == 0xFFFFFFFF then
                enter_vehicle(m_vehicleId, PlayerIndex, 2)
                bool = true
            elseif enable_passenger and (passenger == 0xFFFFFFFF or passenger  == 0) then
                enter_vehicle(m_vehicleId, PlayerIndex, 1)
                bool = true
            end
            if bool and count then
                say(PlayerIndex, "**Taxi** Did you call a taxi? Welcome aboard!")
            end
        end
    end
end

-- returns the number of available seats in players vehicle, requires GetVehicleSeats function
function checkSpaces(PlayerIndex, m_vehicleId)
    if (player_alive(PlayerIndex) == false) then return 0 end
    local seats = GetVehicleSeats(PlayerIndex, m_vehicleId)
    local team = get_var(PlayerIndex,"$team")
    if (m_vehicleId ~= nil) then
        if seats > 0  then
            for i = 1,16 do
                if PlayerIndex ~= i and player_alive(i) and get_var(i,"$team") == team and isinvehicle(i) then
                    if GetplayerVehicleId(i) == m_vehicleId then
                        seats = seats - 1
                    end
                end
            end
        end
        return seats
    end
end

-- returns number of seats in selected vehicle, sets the number of seats (some vehicles have seats not correctly setup)
-- return the number of vehicle seats not including the driver
function GetVehicleSeats(PlayerIndex, m_vehicleId)
    if (player_alive(PlayerIndex) == false) then return false end
    if m_vehicleId ~= false then
        local avail_seats = 0
        local veh_name = GetPlayerVehicleTagName(PlayerIndex)
        if veh_name ~= nil then
            if string.find(veh_name, "ghost") or string.find(veh_name, "banshee") or string.find(veh_name, "turret") then
                avail_seats = 0
            elseif string.find(veh_name, "hog") then
                avail_seats = 2
            elseif string.find(veh_name, "scorpion") then
                avail_seats = 1
            else
                avail_seats = 0
            end
            local seats = avail_seats
            return tonumber(seats)
        end
    else
        return 0
    end
end

-- returns vehicle tag name of players vehicle
function GetPlayerVehicleTagName(PlayerIndex)
    if isinvehicle(PlayerIndex) then
        local player_object = get_dynamic_player(PlayerIndex)
        local vehicleId = read_dword(player_object + 0x11C)
        local vehicle_obj = get_object_memory(vehicleId)
        local veh_name = read_string(read_dword(read_word(vehicle_obj) * 32 + 0x40440038))
        if veh_name ~= nil then
            return veh_name
        else
            return nil
        end
    end
end

function resetpassenger(PlayerIndex)
    if set_seat[PlayerIndex].seat == nil then return end
    if set_seat[PlayerIndex].vehicle then
        write_dword(set_seat[PlayerIndex].vehicle + 0x32C, 0xFFFFFFFF)
        set_seat[PlayerIndex].seat = nil
    end
end

function getplayerobjectid(PlayerIndex)
    local playerindex = to_player_index(PlayerIndex)
    return read_dword(get_player(playerindex) + 0x34) or nil
end

-- assign passenger seat player to vehicle
-- overcomes defect in reliability of passenger seat reading for scripts
function assignpassenger(arg)
    if (game_started == true) then
        set_seat[objectidtoplayer(arg[1])].vehicle = arg[2]
        writedword(arg[2] + 0x32C, arg[1])
    end
    return false
end

-- returns PlayerIndex from an ObjectID
function objectidtoplayer(ObjectID)
    local object = get_object_memory(ObjectID)
    if object ~= 0 then
    local playerId = read_word(object + 0xC0)
    return to_player_index(playerId) ~= 0 or nil end
end

-- returns vehicle object id player is in, or false
function GetplayerVehicleId(PlayerIndex)
    if (player_alive(PlayerIndex) == false) then return false end
    local player_object = get_dynamic_player(PlayerIndex)
    local vehicleId = read_dword(player_object + 0x11C)
    if (vehicleId ~= 0xFFFFFFFF) then return vehicleId else return false end
end

-- returns true if player is in a vehicle, or false if not
function isinvehicle(PlayerIndex)  -- edited 7/20/2016
    local player_object = get_dynamic_player(PlayerIndex)
    if player_object ~= 0 then
        local vehicleId = read_dword(player_object + 0x11C)
        if vehicleId == 0xFFFFFFFF then
            return false
        else
            return true
        end
    else
        return false
    end
end

-- set defaults on a per map basis, entire map name should be within quotes, even when map name has
-- square brackets, parenthesis, periods; example: ["[h3] core"]
function LoadDefaults()
    -- default enable/disable TAXI for the specified map: true = enable, false = disable
    enable_taxi = {
        ["beavercreek"] = false,
        ["bloodgulch"] = true,
        ["boardingaction"] = true,
        ["carousel"] = false,
        ["chillout"] = false,
        ["damnation"] = false,
        ["dangercanyon"] = true,
        ["deathisland"] = true,
        ["gephyrophobia"] = true,
        ["hangemhigh"] = false,
        ["icefields"] = true,
        ["infinity"] = true,
        ["longest"] = false,
        ["prisoner"] = false,
        ["putput"] = false,
        ["ratrace"] = false,
        ["sidewinder"] = true,
        ["timberland"] = true,
        ["wizard"] = false
        }
    -- default enable/disable taxi to PASSENGER seat for the specified map: true = enable, false = disable
    -- ignored if taxi is disabled for the map
    enable_passenger = {
        ["beavercreek"] = false,
        ["bloodgulch"] = true,
        ["boardingaction"] = false,
        ["carousel"] = false,
        ["chillout"] = false,
        ["damnation"] = false,
        ["dangercanyon"] = true,
        ["deathisland"] = true,
        ["gephyrophobia"] = true,
        ["hangemhigh"] = false,
        ["icefields"] = true,
        ["infinity"] = true,
        ["longest"] = false,
        ["prisoner"] = false,
        ["putput"] = false,
        ["ratrace"] = false,
        ["sidewinder"] = true,
        ["timberland"] = true,
        ["wizard"] = false
        }
end

function OnError(Message)
    print(debug.traceback())
end

-- Created by H® Shaft
-- Visit http://halorace.org/forum/index.php