--[[
    How about no.
]]

local CHEST_SLOT = 16
local PIT_WIDTH = 3
local PIT_LENGTH = 3
local PIT_DEPTH = 45

local function log(str, ...)
    print(string.format(str, ...))
end

local function transfer_inventory()
    local move_above_chest = turtle.up()
    if move_above_chest then
        turtle.select(CHEST_SLOT)
        local chest_slot_info = turtle.getItemDetail()
        if chest_slot_info and chest_slot_info.name == 'enderstorage:ender_storage' then
            local place_chest_belove = turtle.placeDown(CHEST_SLOT)
            if place_chest_belove then
                for slot = 1, 15 do
                    turtle.select(slot)
                    local slot_items = turtle.getItemCount(slot)
                    if slot_items > 0 then
                        turtle.select(slot)
                        local transfered_item = turtle.dropDown(slot_items)
                        if transfered_item then
                            log('Transfered %i items from slot %i to ME system.', slot_items, slot)
                        end
                    end
                end
                turtle.select(16)
                turtle.digDown()
                for slot = 1, 16 do
                    turtle.select(slot)
                    local chest_info = turtle.getItemDetail()
                    if chest_info and chest_info.name == 'enderstorage:ender_storage' then
                        turtle.transferTo(CHEST_SLOT)
                        break
                    end
                end
            else
                log('Unable to place our Ender Chest below us, what happened?')
            end
        else
            log("Place an Ender Chest in slot 16!")
        end
        turtle.down()
    end
end

local function check_inventory()
    local total_slots = 15
    local used_slots = 0
    for slot = 1, total_slots do
        local count = turtle.getItemCount(slot)
        if count > 0 then
            used_slots = used_slots + 1
        end
    end
    if used_slots >= total_slots then
        log('Inventory full, transfering...')
        transfer_inventory()
    end
end


local function forward()
    local success = turtle.forward()
    if not success then
        turtle.dig()
        local second_try = turtle.forward()
        return second_try
    end
    return success
end

local function pit()
    local direction = 'forwards'
    local moving = 'right'
    local first = true
    local start_x, start_z, start_y = gps.locate(5)

    log('Starting at layer %i', start_y)
    log('Going to layer %i', PIT_DEPTH)

    for y = start_y, PIT_DEPTH, -1 do
        for x = 1, PIT_WIDTH do
            for z = 1, PIT_LENGTH - 1 do
                check_inventory()
                turtle.digDown()
                forward()
            end

            turtle.digDown()

            if x < PIT_WIDTH then
                if moving == 'right' then
                    if direction == 'forwards' then
                        turtle.turnRight()
                        forward()
                        turtle.digDown()
                        turtle.turnRight()
                        direction = 'backwards'
                    else
                        turtle.turnLeft()
                        forward()
                        turtle.digDown()
                        turtle.turnLeft()
                        direction = 'forwards'
                    end
                else
                    if direction == 'forwards' then
                        turtle.turnLeft()
                        forward()
                        turtle.digDown()
                        turtle.turnLeft()
                        direction = 'backwards'
                    else
                        turtle.turnRight()
                        forward()
                        turtle.digDown()
                        turtle.turnRight()
                        direction = 'forwards'
                    end
                end
            end
        end

        if moving == 'right' then
            if direction == 'forwards'then
                turtle.turnRight()
                turtle.turnRight()
                direction = 'backwards'
                moving = 'left'
            else
                turtle.turnLeft()
                turtle.turnLeft()
                direction = 'forwards'
                moving = 'right'
            end
        else
            if direction == 'forwards'then
                turtle.turnLeft()
                turtle.turnLeft()
                direction = 'backwards'
                moving = 'left'
            else
                turtle.turnRight()
                turtle.turnRight()
                direction = 'forwards'
                moving = 'right'
            end
        end

        if y > PIT_DEPTH then
            log('Moving down, starting layer %i', y - 1)
            turtle.down()
        end
    end

    local end_x, end_z, end_y = gps.locate(5)
    for z = end_y, start_y do
        if z > start_y then
            turtle.up()
        end
    end

    transfer_inventory()
end

pit()