import re
import random
from collections import Counter, defaultdict

def parse_chat(file_path):
    pattern = r"(\d{1,2}/\d{1,2}/\d{2,4}), (\d{1,2}:\d{2}) - ([^:]+): (.*)"
    messages = []

    with open(file_path, "r", encoding="utf-8") as f:
        for line in f:
            match = re.match(pattern, line)
            if match:
                date, time, sender, text = match.groups()
                
                # Normalize names
                if sender == "ak":
                    sender = "Aman"
                elif sender == "Sarah con H":
                    sender = "Sarah"
                
                messages.append({
                    "date": date,
                    "time": time,
                    "sender": sender,
                    "text": text.strip()
                })
    return messages


def extract_inside_jokes(messages):
    funny_candidates = []
    cute_candidates = []
    memory_candidates = []
    phrase_counter = Counter()

    funny_keywords = ["lol", "😂", "🤣", "lmao", "funny", "haha", "hehe","hahaha"]
    cute_keywords = ["miss", "thank", "sweet", "cute", "proud", "happy","aww","glad"]

    for msg in messages:
        text = msg["text"].lower()

        # Funny moments
        if any(k in text for k in funny_keywords):
            funny_candidates.append(msg["text"])

        # Cute/emotional moments
        if any(k in text for k in cute_keywords):
            cute_candidates.append(msg["text"])

        # Memorable random moments
        if len(msg["text"].split()) > 4:  # skip too short
            memory_candidates.append(msg["text"])

        # Count repeated words
        phrase_counter.update(text.split())

    top_words = [w for w, c in phrase_counter.most_common(40)]

    return {
        "funny": funny_candidates,
        "cute": cute_candidates,
        "memories": memory_candidates,
        "top_words": top_words
    }


def random_memory(messages):
    """Returns a random meaningful moment."""
    long_messages = [m["text"] for m in messages if len(m["text"]) > 10]
    if not long_messages:
        return "One of your old conversations ❤️"
    return random.choice(long_messages)