coalmover

local function left()
    turtle.turnLeft()
    if turtle.detect() then
        --turtle.dig()
    end
    turtle.forward()
    turtle.turnRight()
end

local function right()
    turtle.turnRight()
    if turtle.detect() then
        --turtle.dig()
    end
    turtle.forward()
    turtle.turnLeft()
end

local function forward()
    if turtle.detect() then
        turtle.dig()
    end
    turtle.forward()
end

local function back()
    turtle.back()
end

local function up()
    if turtle.detectUp() then
        turtle.digUp()
    end
    turtle.up()
end

local function down()
    turtle.down()
end

local atHopper = true

while true do
    -- take items from hopper
    if atHopper then
        for i=1,6 do
            turtle.suck()
            select(i+1)
        end
    end

    turtle.select(1)


    --get total amount of coal
    local count = 0
    for i=1, 16 do
        local item = turtle.getItemDetail(i)
        if item then
            count = count + item.count
        end
    end



    if count >= 32 then
        --refuel
        atHopper = false
        count = count -2
        turtle.select(1)
        turtle.refuel(1)


        -- go to chest to distribute
        left()
        left()
        left()
        up()
        forward()

        -- distribute to chest
        for i=1,6 do
            turtle.select(i)
            turtle.drop(64)
        end

        --go back to hopper
        back()
        down()
        right()
        right()
        right()
        sleep(120)
        atHopper = true
        select(1)
        turtle.drop(2)
    end
end