local x,y,z = ...
x,y,z = tonumber(x), tonumber(y), tonumber(z)

--better forward
local function forward()
    while not turtle.forward() do
        turtle.dig()
        turtle.attack()
    end
end

--better up
local function up()
    while not turtle.up() do
        turtle.digUp()
        turtle.attackUp()
    end
end

--main function to dig everything out
local function dig_out()
    local height = 1
    local opposite = false
    forward()
    turtle.turnRight()
    --doing everything per layer
    for j = 1, z do
        --mining out per height
        for i = 1, y do
            --mining out each horizontal layer
            for i = 1, x - 1 do
                --height checks to speed up process by digging up/down
                if height == 1 then
                    while turtle.detectUp() do
                        turtle.digUp()
                    end
                elseif height == y then
                    while turtle.detectDown() do
                        turtle.digDown()
                    end
                else
                    while turtle.detectUp() do
                        turtle.digUp()
                    end
                    while turtle.detectDown() do
                        turtle.digDown()
                    end
                end
                forward()
                if height == 1 then
                    while turtle.detectUp() do
                        turtle.digUp()
                    end
                elseif height == y then
                    while turtle.detectDown() do
                        turtle.digDown()
                    end
                else
                    while turtle.detectUp() do
                        turtle.digUp()
                    end
                    while turtle.detectDown() do
                        turtle.digDown()
                    end
                end
            end
            if not opposite then opposite = true else opposite = false end
            if height == y then
                if opposite then
                    turtle.turnRight()
                    turtle.turnRight()
                    for i = 1, x - 1 do
                        forward()
                    end
                    turtle.turnRight()
                else
                    turtle.turnRight()
                end
                for i = 1, y - 1 do
                    turtle.digDown()
                    turtle.down()
                end
                if j ~= z then
                    forward()
                    turtle.turnRight()
                end
                height = 1
                opposite = false
                break
            end
            --turning around
            turtle.turnRight()
            turtle.turnRight()
            -- going up
            for i = 1, 3 do
                if height == y then break end
                up()
                height = height + 1
            end
        end
    end
end

local function smart_fuel()
    local fuel_needed = (z + (z * (math.floor(y/3) * x))) * 1.4
    term.clear()
    if turtle.getFuelLevel() <= fuel_needed then
        while turtle.getFuelLevel() <= fuel_needed do
            term.clear()
            term.setCursorPos(1,1)
            print("Fuel needed:", fuel_needed)
            term.setCursorPos(1,2)
            print("Current fuel:", turtle.getFuelLevel())
            turtle.refuel()
        end
    end
    term.clear()
    term.setCursorPos(1,1)
    print("Success, beginning to dig.")
end

smart_fuel()
dig_out()