collectLava

bucketList = {"minecraft:bucket", "minecraft:lava_bucket"}

-- selects slot with bucket
local function selectBucket()
    local item = turtle.getItemDetail()
    if item then
        if (item.name == bucketList[1]) then
            return true
        end
        if (item.name == bucketList[2]) then
            return true
        end
    end

    for i=1, 16, 1 do
        turtle.select(i)
        item = turtle.getItemDetail()
        if item then
            if (item.name == bucketList[1]) then
                return true
            end
            if (item.name == bucketList[2]) then
                return true
            end
        end
    end
    return false
end

--Returns bool bFullTank and bBucketIsEmpty (if fuel is maximum and if bucket contains nothing)
local function getBucketAndFuelData()
    local fuelLevel = turtle.getFuelLevel()
    local maxFuelLevel = turtle.getFuelLimit()
    local bFullTank = (fuelLevel == maxFuelLevel)

    local bBucketIsEmpty = true
    local item = turtle.getItemDetail()

    if item then
        if (item.name == bucketList[1]) then
            bBucketIsEmpty = true
        end
        if (item.name == bucketList[2]) then
            bBucketIsEmpty = false
        end
    end
    return bFullTank, bBucketIsEmpty
end

--collects lava in this direction (tries to use it)
local function Front(lavaCnt)
    local bFullTank, bEmptyBucket = getBucketAndFuelData()
    local bRefueld = false

    if bEmptyBucket then
        turtle.place()
    end
    if not bFullTank then
        turtle.refuel()
        bRefueld = true
    end
    if not bEmptyBucket then
        turtle.place()
        if not bRefueld then
            turtle.place()
        end
    end
    lavaCnt[1] = lavaCnt[1] + 1
end

local function Top(lavaCnt)
    local bFullTank, bEmptyBucket = getBucketAndFuelData()
    local bRefueld = false

    if bEmptyBucket then
        turtle.placeUp()
    end
    if not bFullTank then
        turtle.refuel()
        bRefueld = true
    end
    if not bEmptyBucket then
        turtle.placeUp()
        if not bRefueld then
            turtle.placeUp()
        end
    end
    lavaCnt[1] = lavaCnt[1] + 1
end

local function Bottom(lavaCnt)
    local bFullTank, bEmptyBucket = getBucketAndFuelData()
    local bRefueld = false

    if bEmptyBucket then
        turtle.placeDown()
    end
    if not bFullTank then
        turtle.refuel()
        bRefueld = true
    end
    if not bEmptyBucket then
        turtle.placeDown()
        if not bRefueld then
            turtle.placeDown()
        end
    end
    lavaCnt[1] = lavaCnt[1] + 1
end

return { selectBucket = selectBucket, Front = Front, Top = Top, Bottom = Bottom}