# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# Activity 2 — Smart Safe Logic
# Level 3 | First Month Recap
# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
from machine import Pin
import time

# ── Input switches ─────────────────────────────
# Using PULL_UP:
# Switch OFF/Open  -> GPIO reads 1 -> check is False
# Switch ON/GND    -> GPIO reads 0 -> check is True

master_key = Pin(12, Pin.IN, Pin.PULL_UP)     # M
pin_code   = Pin(13, Pin.IN, Pin.PULL_UP)     # P
finger     = Pin(14, Pin.IN, Pin.PULL_UP)     # F

# ── Output LEDs ────────────────────────────────
unlocked_led = Pin(2, Pin.OUT)   # Green LED: Safe Unlocked
locked_led   = Pin(4, Pin.OUT)   # Red LED: Safe Locked

last_state = None

while True:
    # Read switches
    # Because we use PULL_UP, pressed/active means GPIO value is 0
    M = master_key.value() == 0
    P = pin_code.value() == 0
    F = finger.value() == 0

    # Smart Safe Logic:
    # Unlock if any 2 security checks are true
    S = (M and F) or (P and F) or (M and P)

    # Count how many checks are active
    active_count = 0

    if M:
        active_count += 1

    if P:
        active_count += 1

    if F:
        active_count += 1

    # Control LEDs
    if S:
        unlocked_led.value(1)
        locked_led.value(0)
    else:
        unlocked_led.value(0)
        locked_led.value(1)

    # Print only when state changes to avoid too many messages
    current_state = (M, P, F, S)

    if current_state != last_state:
        print("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━")

        # Option A: Print active security checks
        print("Active Security Checks:")

        if M:
            print("- Master Key inserted")

        if P:
            print("- Correct PIN entered")

        if F:
            print("- Fingerprint matched")

        if active_count == 0:
            print("- None")

        # Print safe result
        if S:
            print("Safe Status: UNLOCKED")
        else:
            print("Safe Status: LOCKED")

        # Option C: Warning if only one check is true
        if active_count == 1:
            print("Warning: Only one security check is active!")
            print("The safe needs at least 2 checks to unlock.")

        last_state = current_state

    time.sleep(0.1)