mineshaft

--Improvements to add:
--Make sure the turtle has enough fuel and torches to do a run
--Doesn't drop fuel in the chest

local function prerunCheck()

end

local function storeAll()
    for i = 1,16 do
        turtle.select(i)
        turtle.drop()
    end
end

local function store()
    for i =1,16 do
        details = turtle.getItemDetail(i)
        if details.name ~= "minecraft:torch" then
            turtle.select(i)
            turtle.drop()
        end
    end
end

local function home()
    lastPosX = movement.x
    lastPosY = movement.y
    lastPosZ = movement.z
    lastPhase = phase

    if phase == 3 then
        movement.gotoZXY(-length, 0, 1)
        movement.gotoZXY(0, 0, 0)
    else
        movement.gotoXZY(0, 0, 0)
    end

    movement.turnTo(0)
    store()

    if lastPhase == 3 then
        movement.gotoYZX(lastPosY, -length, lastPosX)
        movement.gotoYZX(lastPosY, lastPosZ, lastPosX)
    else
        movement.gotoYZX(lastPosY, lastPosZ, lastPosX)
    end
end

args = {...}
torchSpace = 9
phase = 1
gap = 3

if args[1] == nil then
    print("Usage: mineshaft (length)")
    return
end
length = tonumber(args[1])
os.loadAPI("movement")
os.loadAPI("util")
turtle.select(1)
movement.init()
movement.up()

local function digColumn()
    movement.digForward()
    turtle.digUp()
    turtle.digDown()
    if util.isFull() then
        home()
    end
end

for i = 1,length do
    digColumn()
    if i % torchSpace == 0 then
        util.select("torch")
        turtle.placeDown()
        turtle.select(1)
    end
end

phase = 2
movement.turnLeft()

for i = 0,gap do
    digColumn()
end

movement.turnLeft()

util.select("torch")
turtle.placeDown()

phase = 3
for i = 1,length do
    digColumn()
    if i % torchSpace == 0 then
        util.select("torch")
        turtle.placeDown()
        turtle.select(1)
    end
end

phase = 4
movement.gotoXZY(0, 0, 0)
movement.turnTo(0)
storeAll()
movement.turnTo(1)