TUM.atc = {}

do
    function TUM.atc.requestNavAssistanceToObjective(index, delayRadioAnswer)
        local obj = TUM.objectives.getObjective(index)
        if not obj then return end

        local msgIDSuffix = ""
        if obj.preciseCoordinates then msgIDSuffix = "Precise" end

        local players = coalition.getPlayers(TUM.settings.getPlayerCoalition())
        for _,p in ipairs(players) do
            -- Give BRA to objective
            local navInfo = "- Fly "..DCSEx.dcs.getBRAA(obj.waypoint3, p:getPoint(), false).."\n"

            -- Give flight time and ETA
            local velocity = p:getVelocity()
            local speed = math.max(1, math.sqrt(velocity.x * velocity.x + velocity.y * velocity.y + velocity.z * velocity.z))
            local distance = DCSEx.math.getDistance2D(obj.waypoint2, DCSEx.math.vec3ToVec2(p:getPoint()))
            local timeInMinutes = math.max(1, math.floor(distance / (speed * 60)))
            local eta = DCSEx.string.getTimeString(timer.getAbsTime() + timeInMinutes * 60)
            if timeInMinutes > 600 then
                navInfo = navInfo.."- More than ten hours of flight time at current airspeed\n"
            elseif timeInMinutes > 120 then
                navInfo = navInfo.."- "..tostring(math.floor(timeInMinutes / 60)).." hours of flight time at current airspeed, ETA "..eta.."\n"
            else
                navInfo = navInfo.."- "..tostring(timeInMinutes).." minute(s) of flight time at current airspeed, ETA "..eta.."\n"
            end

            -- Give objective coordinates
            if obj.preciseCoordinates then
                navInfo = navInfo.."\nExact coordinates for objective are:\n"
            else
                navInfo = navInfo.."\nNo exact coordinates for objective. Approximate coordinates are:\n"
            end
            navInfo = navInfo..DCSEx.world.getCoordinatesAsString(obj.waypoint3, false)

            TUM.radio.playForUnit(DCSEx.dcs.getObjectIDAsNumber(p), "commandObjectiveCoordinates"..msgIDSuffix, { obj.name, navInfo }, "Command", delayRadioAnswer)
        end
    end

    function TUM.atc.requireNearestAirbase(delayRadioAnswer)
        local players = coalition.getPlayers(TUM.settings.getPlayerCoalition())
        for _,p in ipairs(players) do
            local airbaseInfo = "- No airbase available near you at the moment." -- TODO: proper "no airbase" message

            local validAirbaseTypes = { Airbase.Category.AIRDROME }
            if p:hasAttribute("Helicopters") then table.insert(validAirbaseTypes, Airbase.Category.HELIPAD) end
            local pDesc = p:getDesc()
            if pDesc.LandRWCategories and #pDesc.LandRWCategories > 0 then
                -- TODO: check player unit description to filter compatible carrier types
                table.insert(validAirbaseTypes, Airbase.Category.SHIP)
            end

            local allAirbases = coalition.getAirbases(TUM.settings.getPlayerCoalition())
            if allAirbases and #allAirbases > 0 then
                allAirbases = DCSEx.dcs.getNearestObjects(DCSEx.math.vec3ToVec2(p:getPoint()), allAirbases)

                for i=1,#allAirbases do
                    local abDesc = airbaseInfo[i]:getDesc()

                    if DCSEx.table.contains(validAirbaseTypes, abDesc.category) then
                        airbaseInfo = abDesc.displayName
                        break
                    end
                end
            end

            TUM.radio.playForUnit(DCSEx.dcs.getObjectIDAsNumber(p), "atcRequireNearestAirbase", { airbaseInfo }, "Control", delayRadioAnswer)
        end
    end

    function TUM.atc.requestWeatherUpdate(delayRadioAnswer)
        local weatherInfo = "- It is currenly "..DCSEx.string.getTimeString()
        if Library.environment.isItNightTime() then
            weatherInfo = weatherInfo.." (night, sunrise at "..DCSEx.string.getTimeString(Library.environment.getDayTime(nil, false))..")\n"
        else
            weatherInfo = weatherInfo.." (day, sunset at "..DCSEx.string.getTimeString(Library.environment.getDayTime(nil, true))..")\n"
        end

        weatherInfo = weatherInfo.."- Average windspeed is "..tostring(DCSEx.floor(Library.environment.getWindAverage())).."m/s\n"

        local players = coalition.getPlayers(TUM.settings.getPlayerCoalition())
        for _,p in ipairs(players) do
            TUM.radio.playForUnit(DCSEx.dcs.getObjectIDAsNumber(p), "atcWeatherUpdate", { weatherInfo }, "Control", delayRadioAnswer)
        end
    end
end