"""Detect conversation boundaries so AIM threads stay isolated."""

from __future__ import annotations

import re

GOODBYE_RE = re.compile(
    r"\b(bye|later|gtg|g2g|gotta go|see ya|cya|ttyl|goodnight|g'?night|night night|signing off)\b",
    re.I,
)
GREET_RE = re.compile(
    r"^(hey|hi|hello|sup|yo|heyy+|wassup|what'?s up|whats up|hiya|mornin|evenin)\b",
    re.I,
)


def looks_like_goodbye(text: str) -> bool:
    return bool(GOODBYE_RE.search(text.strip()))


def looks_like_greeting(text: str) -> bool:
    t = text.strip()
    if not t:
        return False
    return bool(GREET_RE.match(t)) and len(t.split()) <= 8


def assistant_said_goodbye(history: list[dict]) -> bool:
    for msg in reversed(history):
        if msg.get("role") == "assistant":
            return looks_like_goodbye(msg.get("content", ""))
        if msg.get("role") == "user":
            break
    return False


def fresh_conversation_prefix(gap_sec: float) -> str:
    mins = max(1, int(gap_sec / 60))
    return (
        f"[New AIM conversation — you were away ~{mins} min. "
        f"This is a fresh window. Don't continue old threads unless Caleb brings them up.]"
    )