-- vi: ft=lua
-- Goal: collect lava using buckets in the nether, deposit the buckets into a fluid transposer that extracts the lava and sends it to a power generator

local function compareItemName(target)
    local itemDetail = turtle.getItemDetail()
    if itemDetail == nil then
        return nil
    end
    return itemDetail.name == target
end

local function isEmptyBucket()
    return compareItemName("minecraft:bucket")
end

local function isLavaBucket()
    return compareItemName("minecraft:lava_bucket")
end

local function findFirstEmptyBucket()
    for i=1,16 do
        if isEmptyBucket() then
            print('Found an empty bucket in slot ' .. i)
            return i
        end
    end
    return nil
end

local function findFirstLavaBucket()
    for i=1,16 do
        turtle.select(i)
        if isLavaBucket() then
            print('Found a lava bucket in slot ' .. i)
            return i
        end
    end
    return nil
end

local function returnToBase()
    print(ForwardCounter)
end

local function despositRefill()
end

local function refuel()
    local lava_bucket = findFirstLavaBucket()
    if lava_bucket == nil then
        return false
    end

    turtle.select(lava_bucket)
    turtle.refuel()
    return true
end


ForwardCounter = 0

while true do
    if turtle.getFuelLevel() < 1000 then
        if not refuel() then
            print('refulling failed. probably the end of the lava lake. returning to base')
            returnToBase()
            break
        end
    end

    local bucket = findFirstEmptyBucket()

    if bucket == nil then
        print('could not find any empty buckets. returning and refilling')
        returnToBase()
        despositRefill()

    else
        turtle.select(bucket)
        -- try to fill it
        turtle.placeDown()
        if isEmptyBucket() then
            if turtle.forward() then
                ForwardCounter = ForwardCounter + 1
            end
        end
    end
end