CobbleGenerator

local T

local function checkFuelNeeded(quantity)
    local fuelNeeded = quantity - turtle.getFuelLevel() -- eg 600
    if fuelNeeded > 0 then
        T:checkInventoryForItem({"minecraft:lava_bucket", "coal", "planks"}, {1, math.ceil(fuelNeeded / 60), math.ceil(fuelNeeded / 15)}) -- 0 if not present
        T:refuel(quantity, true)
    end
end

local function getSupplies()
    T:clear()
    T:checkInventoryForItem({"minecraft:chest"}, {4}, true)
    T:checkInventoryForItem({"stairs"}, {16}, true)
    T:checkInventoryForItem({"minecraft:lava_bucket"}, {1}, true)
    T:checkInventoryForItem({"minecraft:water_bucket"}, {1}, true)
end

local function createGenerator()
    local function placeStairs(path, direction)
        T:go(path)
        T:place("minecraft:cobblestone_stairs", 0, direction)
    end

    checkFuelNeeded(250)
    getSupplies()
    T:up(2)
    T:place("minecraft:chest", 0, "forward")

    placeStairs("U1", "forward")        -- first stairs, facing inwards, to hold water
    placeStairs("U1B1","down")          -- stairs on opposite side, centre of back edge
    placeStairs("R1F1L1","down")        -- stairs on back left corner
    placeStairs("F1L1","down")          -- centre left
    placeStairs("R1F1L1","down")        -- front left corner

    placeStairs("F2L2","down")          -- front centre
    placeStairs("R1F1L1","down")        -- front right corner
    placeStairs("R1F1L1","down")        -- right side centre

    placeStairs("B1","forward")         -- right back corner, top layer
    for i = 1, 3 do                     -- back, left and front top layer
        placeStairs("R1F1L1F2L1","forward")
        placeStairs("R1F1L1","forward")
    end
    placeStairs("R1F1L1F2L1","forward") -- right centre top layer
    T:go("U1F2L1F1R2x2")                -- move above water source step and dig out covering stair
    T:place("minecraft:water_bucket", 0, "down")
    placeStairs("D1B1","forward")       -- replace stairs removed to allow water access
    T:go("U1F2L2D2")                    -- move to 1 above final position
    T:place("minecraft:lava_bucket", 0, "up")
    T:down(1)                           -- move to final position
    for i = 1, 3 do                     -- place remaining 3 chests
        T:turnRight(1)
        T:place("minecraft:chest", 0, "forward")
    end
end

function main()
    T = require("lib.clsTurtle"):new(true) -- true enables logfile to log.txt
    createGenerator()
end

main()