#!/usr/bin/env python3
"""
Catchphrase with LCD Output (Centered & Clean)
"""

import random
import time
import threading
import sys
from RPLCD.i2c import CharLCD

# ---------- CONFIG ----------
WORDS_FILE    = "words.txt"   # file with one word per line
TIMER_SECONDS = 30            # how long the timer runs
I2C_ADDRESS   = 0x27          # change if your LCD address is different
I2C_CHIP      = 'PCF8574'     # common backpack chip

# ---------- LCD ----------
lcd = CharLCD(I2C_CHIP, I2C_ADDRESS)

def lcd_print(text, line=0):
    """Print text centered on given LCD line (0 or 1), padded to clear leftovers."""
    lcd.cursor_pos = (line, 0)
    lcd.write_string(text.center(16))  # 16 chars wide

# ---------- HELPERS ----------
def load_words(path=WORDS_FILE):
    """Return a list of non-empty stripped lines from the given file."""
    try:
        with open(path, "r", encoding="utf-8") as f:
            words = [line.strip() for line in f if line.strip()]
        if not words:
            raise ValueError("Word file is empty.")
        return words
    except Exception as e:
        print(f"❌ Error loading words: {e}")
        sys.exit(1)

def pick_random(words):
    """Return a random word from the list."""
    return random.choice(words)

# ---------- TIMER THREAD ----------
class CountdownTimer(threading.Thread):
    def __init__(self, seconds=TIMER_SECONDS, on_finish=None):
        super().__init__()
        self.seconds = seconds
        self.on_finish = on_finish
        self._running = threading.Event()
        self._running.set()

    def run(self):
        for _ in range(self.seconds):
            if not self._running.is_set():
                break
            time.sleep(1)
        self._running.clear()
        if self.on_finish:
            self.on_finish()

    def stop(self):
        self._running.clear()

    @property
    def is_running(self):
        return self._running.is_set()

# ---------- MAIN LOOP ----------
def main():
    words = load_words()
    timer_thread = None

    print("=== Catchphrase, but Better (LCD) ===")
    print("Commands:")
    print("  start - begin the 30-second timer and show a word immediately")
    print("  next  - show another random word while the timer is running")
    print("  stop  - cancel the timer early")
    print("  exit / quit - leave the program")

    def announce_finish():
        print("\n⏰ Time is up! Returning to menu.")
        lcd_print("Time is up!", line=0)
        print("=== Catchphrase ===")
        print("Commands:")
        print("  start - begin the 30-second timer and show a word immediately")
        print("  next  - show another random word while the timer is running")
        print("  stop  - cancel the timer early")
        print("  exit / quit - leave the program")

    while True:
        try:
            cmd = input("\n> ").strip().lower()
        except EOFError:
            break

        if cmd in ("exit", "quit"):
            if timer_thread and timer_thread.is_running:
                timer_thread.stop()
                timer_thread.join()
            lcd_print("Goodbye!", line=0)
            print("👋 Goodbye!")
            break

        elif cmd == "start":
            if timer_thread and timer_thread.is_running:
                print("[!] Timer is already running.")
            else:
                timer_thread = CountdownTimer(on_finish=announce_finish)
                timer_thread.daemon = True
                timer_thread.start()

                word = pick_random(words)
                print(word)
                lcd_print(word, line=0)
                print(f"[+] 30-second timer started. ({TIMER_SECONDS}s)")

        elif cmd == "next":
            if not (timer_thread and timer_thread.is_running):
                print("[!] No active timer - use 'start' first.")
            else:
                word = pick_random(words)
                print(word)
                lcd_print(word, line=0)

        elif cmd == "stop":
            if timer_thread and timer_thread.is_running:
                timer_thread.stop()
                timer_thread.join()
                lcd_print("Stopped early", line=0)
                print("[+] Timer stopped early.")
            else:
                print("[!] There is no running timer to stop.")

        else:
            print(f"[!] Unknown command: {cmd}")

if __name__ == "__main__":
    main()