-- computercraft mine stairs program
-- options for Enderchest, torches, normal chests and loot-only
-- ########## NOT READY #############

local useEnderChest = false                                 -- place a enderchest, dump stuff in it and collect chest?
local enderChestSlot = 2                                -- slot to place enderchest
local useNormalChest = false                                -- place a chest, dump stuff in it and move on?
local normalChestSlot = 3                               -- slot to place chests
local lootOnly = true                                   -- discard dirt cobble etc?
local useTorch = false                                  -- place torches along path?
local torchSlot = 1                                 -- turtle slot to put torches
local torchInterval = 8                                 -- place torch every X blocks
local tdepth = 30                                   -- tunnels for 30 blocks

torchNeeded = math.floor(tdepth / torchInterval)                    -- calculating needed torches


shell.run("clear")
local temp1 = turtle.getItemDetail(enderChestSlot)
local temp2 = turtle.getItemDetail(normalChestSlot)

if temp1.name != "ender_chest" then
    print("no Enderchest found in slot ".. enderChestSlot)
    exit()
end

if temp2.name != "chest" then
    print("no chest found in slot ".. normalChestSlot)
    exit()
else
    print("Found " .. temp2.count .. "chests in slot " .. normalChestSlot)
end

if turtle.detectDown() then
    turtle.up()
end
for i=0,tdepth do
    turtle.digDown()
    turtle.down()
    while turtle.dig() do
        -- waiting for gravel or sand to fall down
        sleep(.2)
    end
    turtle.forward()
    turtle.digDown()
    if turtle.getItemCount(16) != 0 then
        if useEnderChest then
            turtle.select(enderChestSlot)
            turtle.placeUp()
            if lootOnly then
                for slot=4, 16 do
                    info = turtle.getItemDetail(slot)
                    if info.name != "cobblestone" or info.name != "dirt" or info.name != "gravel" or info.name != "sand" then
                        turtle.select(slot)
                        turtle.dropUp()
                    else
                        turtle.select(slot)
                        turtle.dropDown()
                    end
                end
            else
                for slot=4, 16 do
                    turtle.select(slot)
                    turtle.dropUp()
                end
            end
        else if useNormalChest then
            turtle.select(normalChestSlot)
            if lootOnly then
                for slot=4, 16 do
                    info = turtle.getItemDetail(slot)
                    if info.name != "cobblestone" or info.name != "dirt" or info.name != "gravel" or info.name != "sand" then
                        turtle.select(slot)
                        turtle.dropUp()
                    else
                        turtle.select(slot)
                        turtle.dropDown()
                    end
                end
            else
                for slot=4, 16 do
                    turtle.select(slot)
                    turtle.dropUp()
                end
            end
        end
    end
    if useTorch then
        if i == torchInterval then
            torchInterval = torchInterval+torchInterval
            turtle.select(torchSlot)
            if turtle.getItemCount(torchSlot) != 0 then
                turtle.placeDown()
            else
                turtle.down()
                while turtle.getItemCount(torchSlot) < torchNeeded do
                    shell.run("clear")
                    print("Torches needed, Will resume when replenished.")
                    print("Would need " .. torchNeeded .. "torches.")
                    sleep(3)
                end
                shell.run("clear")
                turtle.up()
                print("here we go again.")
            end
            turtle.select(4)
        end
    end
end