from django.db.models import Q

from apps.epic.models import Room, RoomInvite


# ── Game-wide constants ────────────────────────────────────────────────────
# Reversal probability applied to any card pulled from a stack, anywhere in
# the game (PICK SEA initially; future phases — gameplay draws etc. — will
# share this single source of truth). Stub for a future per-user profile
# override: callers MUST go through stack_reversal_probability(user, room)
# rather than referencing the constant directly so the user-config hookup is
# a one-line change inside the helper.
STACK_REVERSAL_PROBABILITY = 0.25


def stack_reversal_probability(user=None, room=None):
    """Reversal probability for a draw stack in this user's context.

    Current behavior: returns the module default for everyone. Plumbing point
    for a forthcoming per-user setting — when that lands, swap the body to
    something like `return getattr(user.profile, 'reversal_rate', STACK_REVERSAL_PROBABILITY)`
    and every call site picks up the per-user value automatically.
    """
    return STACK_REVERSAL_PROBABILITY



def _planet_house(degree, cusps):
    """Return 1-based house number for a planet at ecliptic degree.

    cusps is the 12-element list from PySwiss where cusps[i] is the start of
    house i+1. Handles the wrap-around case where a cusp crosses 0°/360°.
    """
    degree = degree % 360
    for i in range(12):
        start = cusps[i] % 360
        end   = cusps[(i + 1) % 12] % 360
        if start < end:
            if start <= degree < end:
                return i + 1
        else:  # wrap-around: e.g. cusp at 350° → next at 10°
            if degree >= start or degree < end:
                return i + 1
    return 1


def _compute_distinctions(planets, houses):
    """Return dict {house_number_str: planet_count} for all 12 houses."""
    cusps = houses['cusps']
    counts = {str(i): 0 for i in range(1, 13)}
    for planet_data in planets.values():
        h = _planet_house(planet_data['degree'], cusps)
        counts[str(h)] += 1
    return counts


def rooms_for_user(user):
    """Return a queryset of rooms the user owns, has a gate slot in, or is invited to."""
    return Room.objects.filter(
        Q(owner=user) |
        Q(gate_slots__gamer=user) |
        Q(invites__invitee_email=user.email, invites__status=RoomInvite.PENDING)
    ).distinct()