local port1 = Port:new( GridPoint:new(-1, 0), PortRotation.left, { 0.8, 0.8, 0, 1 } )
local port2 = Port:new( GridPoint:new(0, -1), PortRotation.up, { 0.8, 0, 0.8, 1 } )
local port3 = Port:new( GridPoint:new(3, 2), PortRotation.right, { 0.8, 0, 0, 1 } )
local port4 = Port:new( GridPoint:new(2, 3), PortRotation.down, { 0, 0, 0.8, 1 } )
local port5 = Port:new( GridPoint:new(2, 0), PortRotation.right, {0.8, 0.8, 0, 1} )
local port6 = Port:new( GridPoint:new(0, 2), PortRotation.down, { 0.8, 0.4, 0.4, 1 } )

local mecha1 = Mechanism:new( GridPoint:new(5, 5), GridPoint:new(3, 3), { port1:clone(), port2:clone(), port3:clone(), port4:clone() }, {0.5, 0.5, 0.5, 1} )

local mecha2 = Mechanism:new( GridPoint:new(10, 5), GridPoint:new(2, 2), { port1:clone(), port2:clone(), port5:clone(), port6:clone() }, {0.5, 1, 0.5, 1} )

local mecha3 = Mechanism:new( GridPoint:new(13, 5), GridPoint:new(2, 1), { port1:clone(), port2:clone(), port5:clone() }, {1, 0.5, 0.5, 1} )

local conveyorPortI1 = Port:new( GridPoint:new(-1, 0), PortRotation.left, Color.input )
local conveyorPortI2 = Port:new( GridPoint:new(0, -1), PortRotation.up, Color.input )
local conveyorPortI3 = Port:new( GridPoint:new(0, 1), PortRotation.down, Color.input )
local conveyorPortO = Port:new( GridPoint:new(1, 0), PortRotation.right, Color.output )
local conveyorMecha = Mechanism:new( GridPoint:new(0, 0), GridPoint:new(1, 1), {
    conveyorPortI1:clone(),
    conveyorPortI2:clone(),
    conveyorPortI3:clone(),
    conveyorPortO:clone()
}, Color.mechanism )

local mechs = { conveyorMecha, mecha2, mecha3 }
local actions = { 'none', 'first', 'second', 'third' }

local selected = 0

function selectorUpdate()
    for index, action in ipairs(actions) do
        if Input:actionReleased(action) then
            selected = index - 1
            break
        end
    end
end

---@return Mechanism|nil
function getSelected()
    if selected > 0 then
        return mechs[selected]
    else
        return nil
    end
end