--------------------------------------wind----------------
---   https://www.geogebra.org/m/GDgua6HK
---    y = sin(3x/2)/3+sin(2x/2+2)/3+sin(3x/2-3)/2-sin(4x/2+1)/3-sin(5x/2+3)/4-sin(6x/2+4)/2+sin(x/3)+2.5

script.on_nth_tick(6000, function(event)
    if global.wind >= 1800 then
        global.wind = 0
    end
end)

script.on_nth_tick(60, function(event)
    global.wind = global.wind + 0.02
    local x = global.wind
    local y = (math.sin(3*x/2)/3)+(math.sin(2*x/2+2)/3)+(math.sin(3*x/2-3)/2)-(math.sin(4*x/2+1)/3)-(math.sin(5*x/2+3)/4)-(math.sin(6*x/2+4)/2)+math.sin(x/3)+5

    for _, wind_turbine in pairs(global.wind_turbines) do
        wind_turbine = wind_turbine[1]
        if wind_turbine.valid then
            wind_turbine.fluidbox[1] = {name="steam", amount=200, temperature=14*y}
        end
    end
end)

local function create_varibles()
    global.wind = global.wind or 0
    global.wind_turbines = global.wind_turbines or {}
end

script.on_init(create_varibles)
script.on_configuration_changed(create_varibles)

-------------------------------------------------------------------------------------------------------------------
------------------------------------------hidden poles---------------------------------------------

local turbine_map = {
    ["texugo-wind-turbine"] = "twt-electric-pole",
    ["texugo-wind-turbine2"] = "twt-electric-pole2",
    ["texugo-wind-turbine3"] = "twt-electric-pole3",
    ["texugo-wind-turbine4"] = "twt-electric-pole4",
}

script.on_event({defines.events.on_built_entity, defines.events.on_robot_built_entity, defines.events.script_raised_revive}, function(event)
    local entity = event.created_entity or event.entity
    if turbine_map[entity.name] then
        local registration_number = script.register_on_entity_destroyed(entity)
        global.wind_turbines[registration_number] = {entity, entity.name, entity.position, entity.surface}

        local hidden_pole = entity.surface.create_entity{name=turbine_map[entity.name], position=entity.position, force=entity.force}
        hidden_pole.minable = false
        hidden_pole.destructible = false
    end
end)

script.on_event(defines.events.on_entity_destroyed, function(event)
    local entity = global.wind_turbines[event.registration_number]
    if entity and turbine_map[entity[2]] then
        local center = entity[3]
        for _, hidden_pole in pairs(entity[4].find_entities_filtered{
            area = {{center.x-0.5, center.y-0.5}, {center.x+0.5, center.y+0.5}},
            name = turbine_map[entity.name]
        }) do
            hidden_pole.destroy()
        end
    end
    global.wind_turbines[event.registration_number] = nil
end)