Autofurnace

local times_swapped
local counter = 120

function run()
    while(true) do
        print("Getting buckets")
        turtle.turnRight()
        for i=1,16 do
            turtle.select(i)
            turtle.suck(1)
        end
        turtle.turnRight()
        print("Filling buckets")
        for i=1,16 do
            turtle.select(i)
            turtle.place()
        end
        turtle.turnRight()
        print("Returning buckets")
        for i=1,16 do
            turtle.select(i)
            item_data = turtle.getItemDetail(i)
            if(item_data ~= nil) then
                if(string.find(item_data.name, "lava_bucket")) then
                    turtle.drop(1)
                    times_swapped = times_swapped + 1
                end
            end

            local h = fs.open("autofurnace/times_lavaswapped", "w")
            h.writeLine(times_swapped)
            h.close()
        end
        turtle.turnRight()
        repeat
            print("Swapped empty buckets with full buckets " .. times_swapped .. " times.")
            print("")
            print("Waiting " .. counter .. " seconds.")
            sleep(1)
            term.clear()
            counter = counter - 1
        until counter == 0
        counter = 120
    end
end

function start()
    if fs.exists("autofurnace") then
        print("Furnace folder exists, probably a crash")
        crashReport()
        checkDirection()
        crashed_checkInv()
        term.clear()
        run()
    else
        print("making folder")
        fs.makeDir("autofurnace")
        local h = fs.open("autofurnace/times_lavaswapped", "w")
        h.writeLine(0)
        h.close()
        local h = fs.open("autofurnace/times_crashed", "w")
        h.writeLine(0)
        h.close()
        checkDirection()
        term.clear()
        times_swapped = 0
        run()
    end
end

function crashReport()
    print("Making crash report")
    local times_crashed
    local h = fs.open("autofurnace/times_crashed", "r")
    times_crashed = tonumber(h.readLine())
    h.close()
    times_crashed = times_crashed + 1
    local h = fs.open("autofurnace/times_crashed", "w")
    h.writeLine(times_crashed)
    h.close()

    local h = fs.open("autofurnace/times_lavaswapped", "r")
    times_swapped = tonumber(h.readLine())
    h.close()

end

function checkDirection()
    print("Getting right direction")
    if turtle.forward() == false then
        repeat
            turtle.turnLeft()
        until turtle.forward() == true
    end
    turtle.back()
end

function crashed_checkInv()
    print("Empty inventory after crash")
    local item_data
    for i=1,16 do
        turtle.select(i)
        item_data = turtle.getItemDetail(i)
        if(item_data ~= nil) then
            if(string.find(item_data.name, "bucket")) then
                if(item_data.count > 1) then
                    turtle.turnRight()
                    turtle.drop(item_data.count - 1)
                    turtle.turnLeft()
                end
            elseif(string.find(item_data.name, "lava_bucket")) then
                turtle.turnLeft()
                turtle.drop()
                turtle.turnRight()
            else
                turtle.dropDown(item_data.count)
            end
        end
    end
end

start()