--[[Stone Brick Factory program by Al Sweigart
Gets stone from furnace to craft stone bricks, turtle 2 of 2]]

print('Starting stone brick crafting program')

local NUM_FURNACES = 5
local brickCount = 0
while true do
    -- check turtle's fuel
    if turtle.getFuelLevel() < (2 * NUM_FURNACES) then
        error('Turtle needs more fuel!')
    end

    turtle.select(1) -- put stone in slot 1

    -- start collecting stone from furnaces
    for i = 1, NUM_FURNACES do
        turtle.suckUp(64 - turtle.getItemCount(1)) -- get stone from furnace
        if turtle.getItemCount(1) == 64 then
            break -- stop once there are 64 stone blocks
        end
        if i ~= NUM_FURNACES then
            turtle.back() -- move to next furnace
        end
    end

    -- craft stone bricks
    if turtle.getItemCount(1) == 64 then
        turtle.transferTo(2, 16) -- put in slot 2
        turtle.transferTo(5, 16) -- put in slot 5
        turtle.transferTo(6, 16) -- put in slot 6
        turtle.select(16) -- stone brick to go in slot 16
        turtle.craft() -- craft stone bricks
        brick.Count = brickCount + 64
        print('Total stone bricks: ' .. brickCount)
    else
        print('Not enough stones yet. Sleeping...')
        os.sleep(120) -- wait for 2 minutes
    end

    -- move back to chest (by first furnace)
    for i = 1, NUM_FURNACES - 1 do
        turtle.forward()
    end
    turtle.turnLeft() -- face chest
    turtle.select(16) -- select stone bricks
    turtle.drop() -- put stone bricks into chest
    turtle.turnRight() -- face generator again
end