"""Trust scoring. Append events, recompute score + tier.

Phase 1 wiring: email verification grants trust. Listing-survival and flag
penalties hook in during Phase 2/3. Thresholds are intentionally simple here.
"""
from app.extensions import db
from app.models.trust import TrustEvent
from app.models.enums import TrustEventType, TrustTier

# tier thresholds by cumulative score
_TIER_THRESHOLDS = [
    (50, TrustTier.verified),
    (20, TrustTier.trusted),
    (5, TrustTier.basic),
    (0, TrustTier.new),
]


def record_event(user, event_type: TrustEventType, delta: int):
    """Append a trust event, bump score, recompute tier. Caller commits."""
    db.session.add(TrustEvent(user_id=user.id, type=event_type, delta=delta))
    user.trust_score = max(0, (user.trust_score or 0) + delta)
    user.trust_tier = _tier_for(user.trust_score)
    return user


def _tier_for(score: int) -> TrustTier:
    for threshold, tier in _TIER_THRESHOLDS:
        if score >= threshold:
            return tier
    return TrustTier.new