server.lua

local syncing = true

Citizen.CreateThread(function()
    updated = false
    while true do

        if not updated then
            if syncing then
                local hour, minute = os.date("%H"), os.date("%M")

                for i=1, #Config.Updates, 1 do
                    local time = Config.Updates[i]
                    if tonumber(hour) == tonumber(string.sub(time, 1, 2)) then
                        if tonumber(minute) == tonumber(string.sub(time, 4, 5)) then
                            Update()
                            updated = true
                        end
                    end
                end
            end
        else
            Wait(65000)
            updated = false
        end
        Citizen.Wait(1000)
    end
end)

function Update()
    local link = 'http://api.weatherapi.com/v1/current.json?key=' .. Config.APIkey .. '&q=' .. Config.City
    PerformHttpRequest(link, function(err, result, headers)
        if checkErrorCode(err) then
            local r = '[ ' .. result .. ' ]'
            local rt = json.decode(r)
            local hour = tonumber(string.sub(rt[1].current.last_updated, 12, 13))
            for i=1, #Config.Weathers, 1 do
                if Config.Weathers[i].code == rt[1].current.condition.code then
                    if hour >= Config.NightStart or hour <= Config.NightEnd then
                        TriggerClientEvent('some_weathersync:UpdateWeather', -1, Config.Weathers[i].night)
                    else
                        TriggerClientEvent('some_weathersync:UpdateWeather', -1, Config.Weathers[i].day)
                    end
                end
            end
        end
    end)
end

function checkErrorCode(err)
    if err == 401 then
        print('Your api key is wrong! Please fix it')
        return false
    elseif err == 400 then
        print('City name is wrong! Please fix it')
        return false
    elseif err == 403 then
        print('Your api key has exceeded calls per month quota')
        return false
    elseif err == 403 then
        print('Your api key has been disabled!')
        return false
    else
        return true
    end
end

RegisterCommand('syncWeather', function(source, args, raw)
    if checkPermissions(source) then
        Update()
        print('weather synced')
    end
end)

RegisterCommand('stopWeatherSync', function(source, args, raw)
    if checkPermissions(source) then
        syncing = false
        print('syncing stopped')
    end
end)

RegisterCommand('resumeWeatherSync', function(source, args, raw)
    if checkPermissions(source) then
        syncing = true
        Update()
        print('syncing resumed')
    end
end)

RegisterCommand('setSyncingCity', function(source, args, raw)
    if checkPermissions(source) then
        if args[1] then
            local cityName = ''
            if #args == 1 then
                cityName = args[1]
            else
                for i=1, #args-1, 1 do
                    cityName = cityName .. args[i] .. '_'
                end
                cityName = cityName .. args[#args]
            end
            Config.City = cityName
            Update()
            print('New city is - ' .. Config.City)
        else
            print('City name is incorrect. Skipped')
        end
    end
end)

function checkPermissions(src)
    return IsPlayerAceAllowed(src, "weatherSyncSettings")
end

RegisterServerEvent('some_weathersync:beginUpdate')
AddEventHandler('some_weathersync:beginUpdate', function(source)
    Update()
end)