-- Dropper Controller: Runs on Computer 1 (next to dropper_0)
-- Watches the dropper and pulses redstone until it's empty.

local REDSTONE_SIDE = "back"     -- side facing dropper_0
local PULSE_TIME    = 0.3        -- redstone pulse duration in seconds
local POLL_INTERVAL = 0.5        -- how often to check the dropper
local DROPPER_SIDE  = "back"     -- side where the dropper is (as peripheral)

-------------------------------------------------
-- Helpers
-------------------------------------------------

-- Send a redstone pulse to trigger the dropper
local function pulseRedstone()
    redstone.setOutput(REDSTONE_SIDE, true)
    sleep(PULSE_TIME)
    redstone.setOutput(REDSTONE_SIDE, false)
end

-- Check if the dropper has any items
local function dropperHasItems()
    local dropper = peripheral.wrap(DROPPER_SIDE)
    if not dropper then return false end
    local contents = dropper.list()
    if not contents then return false end
    return next(contents) ~= nil
end

-------------------------------------------------
-- Main
-------------------------------------------------

print("=================================")
print("  Dropper Controller (ID " .. os.getComputerID() .. ")")
print("=================================")
print("")
print("Redstone side: " .. REDSTONE_SIDE)
print("Watching dropper for items...")
print("")

while true do
    if dropperHasItems() then
        print("[DISPENSE] Items detected, firing dropper...")

        -- Keep pulsing until the dropper is empty
        while dropperHasItems() do
            pulseRedstone()
            sleep(0.1)
        end

        print("[OK] Dropper empty.")
    end

    sleep(POLL_INTERVAL)
end