local M = {}
local cbor = require("cbor");

-- Connection settings
local ip = "127.0.0.1"
local port = 4444
local udpSocket = nil

-- Car settings
local minOilTemp = 50
local maxOilTemp = 90
local coldOilRPMCoef = 0.5

local function sendPackage(ip, port, id)
    if not electrics.values.watertemp then
        -- vehicle not completly initialized, skip sending package
        return
    end

    local data = {
        app = "beamNG",
        car = {
            brand = "none", --FIXME: value
            model = "none" --FIXME: value
        },
        gear = electrics.values.gearIndex,
        speed = electrics.values.wheelspeed or electrics.values.airspeed,
        axis = {
            t = electrics.values.throttle,
            b = electrics.values.brake,
            c = electrics.values.clutch
        }
    }

    if electrics.values.rpm then
        data.rpm = {
            cur = electrics.values.rpm
        }

        if electrics.values.maxrpm then
            data.rpm.max = electrics.values.maxrpm
        
            local currentTempRedlineCoef = linearScale(electrics.values.oiltemp or 0, minOilTemp, maxOilTemp, coldOilRPMCoef, 1)
            data.rpm.rl = electrics.values.maxrpm * currentTempRedlineCoef
        end
    end

    if electrics.values.oiltemp then
        data.oil = {
            p = 0, --FIXME: value
            t = electrics.values.oiltemp
        }
    end

    if electrics.values.fuel then
        data.fuel = electrics.values.fuel
    end

    --TODO: lights
    --    lights = {
    --        dash = 0, --FIXME: value
    --        on = 0 --FIXME: value
    --    },

    --log("I", "ExtDash", "data: " .. tostring(data) )
    local packet = cbor.encode( data )
    udpSocket:sendto(packet, ip, port)
end

local function updateGFX(dt)
    if not playerInfo.firstPlayerSeated then
        return
    end
    sendPackage(ip, port, 0)
end

local function init(jbeamData)
    minOilTemp = jbeamData.minOilTemp or minOilTemp
    maxOilTemp = jbeamData.maxOilTemp or maxOilTemp
    coldOilRPMCoef = jbeamData.coldOilRPMCoef or coldOilRPMCoef
end

local function onExtensionLoaded()
    if not udpSocket then
        udpSocket = socket.udp()
    end

    ip = settings.getValue("outgaugeIP")
    port = tonumber(settings.getValue("outgaugePort"))

    log("I", "ExtDash", "Extension loaded, connecting to " .. tostring(ip) .. " (" .. tostring(port) .. ")" )
    return true
end

local function onExtensionUnloaded()
    if udpSocket then
        udpSocket:close()
    end
    udpSocket = nil
end

-- public interface
M.onExtensionLoaded = onExtensionLoaded
M.onExtensionUnloaded = onExtensionUnloaded
M.init = init
M.updateGFX = updateGFX

-- other functions
M.sendPackage = sendPackage

return M