"""
db_introductions.py — tracks which characters a user has already met.

Used to give a one-line self-introduction the first time a user speaks with a
character (e.g. Camus greeting before his first reply). After the first turn the
character never re-introduces itself.

Storage: `user_profiles.met_characters text[]` (run characters/shared/users_met_characters.sql).
Keyed by id = user_id. It lives on user_profiles because that is the table that
actually exists and is keyed by the user id (there is no public.users — auth users
live in auth.users). It is deliberately kept OUT of TRACKED_FIELDS so the profile
classifier never reads or overwrites it; we access it with targeted queries here.
"""
from db_user import supabase


def _get_met(user_id: str) -> list:
    res = (
        supabase.table("user_profiles")
        .select("met_characters")
        .eq("id", user_id)
        .limit(1)
        .execute()
    )
    rows = res.data or []
    return (rows[0].get("met_characters") if rows else None) or []


def has_met(user_id: str, character_id: str) -> bool:
    """True if the user has already been introduced to this character.

    Fails safe to True: on any error we assume they've met, so we never crash a
    turn and never risk re-greeting on every message if the column is missing.
    """
    try:
        return character_id in _get_met(user_id)
    except Exception as e:
        print(f"[introductions] has_met failed for {user_id}/{character_id}: {e}")
        return True


def mark_met(user_id: str, character_id: str) -> None:
    """Record that the user has now been introduced to this character.

    Upsert (not update) so it also persists for a brand-new user whose
    user_profiles row does not exist yet — other columns are left untouched.
    """
    try:
        met = _get_met(user_id)
        if character_id in met:
            return
        supabase.table("user_profiles").upsert(
            {"id": user_id, "met_characters": met + [character_id]}
        ).execute()
    except Exception as e:
        print(f"[introductions] mark_met failed for {user_id}/{character_id}: {e}")