local prefix = "[Carlos 1.0a] "


-- Funcao printf
local function printf(...) print(string.format(...)) end


-- Funcao combustivel
local function combustivel()
    local restante = turtle.getFuelLevel() -- Combustivel restante
    local suficiente = false

    while true do
        if restante == 0 then
            suficiente = false
            printf("%sSem combustivel restante, tentando reabastecer.", prefix)
            for i = 1, 16 do
                turtle.select(i)
                if turtle.refuel(0) then
                    local halfStack = math.ceil(turtle.getItemCount(i)/2)
                    turtle.refuel(halfStack)
                    restante = turtle.getFuelLevel()
                    suficiente = true
                    break
                end
            end
        else
            printf("%sCombustivel restante: %s", prefix, restante)
            suficiente = true
            break
        end
    end
    return suficiente

end


-- Funcao minerar
local function minerar(a, b, c)
    local possivel = combustivel()


    while possivel do

        for i=1, c do

            for i=1, b do

                for i=1 , a-1 do
                    turtle.dig()
                    turtle.forward()
                    possivel = combustivel()
                end

                if (i % 2) == 1 then
                    turtle.turnRight()
                    turtle.dig()
                    turtle.forward()
                    possivel = combustivel()
                    turtle.turnRight()
                else
                    turtle.turnLeft()
                    turtle.dig()
                    turtle.forward()
                    possivel = combustivel()
                    turtle.turnLeft()
                end
            end

            if (c % 2) ~= 0 then
                turtle.turnRight()
                turtle.forward()
                possivel = combustivel()
                turtle.turnLeft()
                turtle.digDown()
                turtle.down()
                possivel = combustivel()
            end

            if (c % 2) == 0 then
                turtle.digDown()
                turtle.down()
                possivel = combustivel()
                turtle.turnLeft()

                for i=1, b do
                    turtle.dig()
                    turtle.forward()
                end
                turtle.turnRight()
            end

        end
        break

    end
end


-- Codigo
print(prefix .. "Digite a area para ser minerada: ")
local a = tonumber(read())
local b = tonumber(read())
local c = tonumber(read())

minerar(a, b, c)
print(prefix .. "A area foi minerada.")