---
--- Created by deathsgun.
--- DateTime: 2019-05-21 15:01
---

local arg1, arg2, arg3 = ...
local delay = 0.25

if arg1 == nil or arg2 == nil or arg3 == nil then
    print("Usage: miner <length> <height> <width>")
    return false
end
local length = tonumber(arg1)
local height = tonumber(arg2)
local width = tonumber(arg3)

X = 0;
Y = 0;
Z = 0;
ORIENTATION = 0;

function left()
    turtle.turnLeft()
    if ORIENTATION == 0 then
        ORIENTATION = 3
    else
        ORIENTATION = ORIENTATION - 1
    end
end

function right()
    turtle.turnRight()
    if ORIENTATION == 3 then
        ORIENTATION = 0
    else
        ORIENTATION = ORIENTATION + 1
    end
end

function up()
    while not turtle.up() do
        digUp()
        sleep(delay)
    end
    Y = Y + 1
end

function down(q)
    if q == nil then
        q = 1
    end
    for _ = 1, q do
        while not turtle.down() do
            digDown()
            sleep(delay)
        end
    end
    Y = Y - q
end

function forward(q)
    if q == nil then
        q = 1
    end
    for _ = 1, q do
        while not turtle.forward() do
            turtle.dig()
            turtle.attack()
            sleep(delay)
        end
    end
    if ORIENTATION == 0 then
        X = X + q
    elseif ORIENTATION == 1 then
        Z = Z + q
    elseif ORIENTATION == 2 then
        X = X - q
    elseif ORIENTATION == 3 then
        Z = Z - q
    end
end

function orient(orient)
    while orient ~= 0 do
        right()
    end
end

function dig()
    while turtle.detect() do
        turtle.dig()
        sleep(delay)
    end
end

function digUp()
    while turtle.detectUp() do
        turtle.digUp()
        sleep(delay)
    end
end

function digDown()
    while turtle.detectDown() do
        turtle.digDown()
        sleep(delay)
    end
end

function go(lx, ly, lz)
    print("going to " .. lx .. "/" .. ly .. "/" .. lz)
    if X < lx then
        orient(0)
        for _ = 1, (lx - X) do
            forward()
        end
    end

    if X > lx then
        orient(2)
        for _ = 1, X - lx do
            forward()
        end
    end

    if Y < ly then
        for _ = 1, ly - Y do
            up()
        end
    end

    if Y > ly then
        for _ = 1, Y - ly do
            down()
        end
    end

    if Z < lz then
        orient(1)
        for _ = 1, lz - Z do
            forward()
        end
    end

    if Z > lz then
        orient(3)
        for _ = 1, Z - lz do
            forward()
        end
    end
end

function deposit()
    for i = 2, 16 do
        turtle.select(i)
        while not turtle.drop() and turtle.getItemCount() ~= 0 do
            -- Waits until turtle can deposit item
            sleep(1)
        end
        turtle.drop()
    end
    turtle.select(1)
    return true
end

function check()
    return turtle.getItemCount(15) == 0
end

neededFuel = height*width*length;
neededCoal = neededFuel / 80
if neededCoal < 1 then
    neededCoal = 1
end
print("This operation takes " ..neededCoal .. "of Coal!")
if neededFuel < turtle.getFuelLevel() then
    turtle.select(1)
    print("Please put " .. neededCoal .. " piece(s) of coal into Slot 1!")
    while neededFuel < turtle.getFuelLevel() do
        turtle.refuel()
    end
end
turtle.select(2)

print("Creating a tunnel of " .. height .. "x" .. width .. "x" .. length)

lx = X
ly = Y
lz = Z
for _ = 1, length do
    lx = X
    ly = Y
    lz = Z
    term.write("=")
    for _ = 1, width do
        forward()
        for _ = 1, height do
            up()
        end
        down(height)
        if _ == 1 then
            right()
        elseif _ <= width then
            left()
            forward(width)
        end
    end
    go(lx, ly, lz)
end

go(0, 0, 0)
orient(2)
deposit()
orient(0)
print("Finished task!")