from machine import Pin, PWM
import time

# ----------------------------
# HARDWARE SETUP (WOKWI PICO)
# ----------------------------

# Onboard LED (GPIO 25)
onboard_led = Pin(25, Pin.OUT)

# External LED using PWM (connected to GP15 in Wokwi)
pwm_led = PWM(Pin(15))
pwm_led.freq(1000)

# Button (connected to GP14, uses pull-up)
button = Pin(14, Pin.IN, Pin.PULL_UP)

# ----------------------------
# STATE VARIABLES
# ----------------------------

mode = 0
last_button_state = 1
brightness = 0
direction = 1

print("Wokwi MicroPython Pico Demo Started")

# ----------------------------
# MAIN LOOP
# ----------------------------

while True:

    # ------------------------
    # BUTTON EDGE DETECTION
    # ------------------------
    current_button_state = button.value()

    if last_button_state == 1 and current_button_state == 0:
        mode = 1 - mode
        print("Mode changed to:", mode)
        time.sleep(0.2)  # debounce

    last_button_state = current_button_state

    # ------------------------
    # MODE 0: PWM FADE
    # ------------------------
    if mode == 0:
        brightness += direction * 2000

        if brightness >= 65535:
            brightness = 65535
            direction = -1
        elif brightness <= 0:
            brightness = 0
            direction = 1

        pwm_led.duty_u16(brightness)

        onboard_led.value(1)

    # ------------------------
    # MODE 1: BLINK
    # ------------------------
    else:
        pwm_led.duty_u16(0)
        onboard_led.toggle()
        time.sleep(0.3)

    # ------------------------
    # DEBUG OUTPUT
    # ------------------------
    print("Mode:", mode,
          "Button:", button.value(),
          "Brightness:", brightness)

    time.sleep(0.05)