"""Spawn budget and regular attempt probabilities (R3)."""
from __future__ import annotations

from typing import Dict, Mapping

DEFAULT_BUDGET = {
    "PREP": 0.0,
    "MORNING": 2.5,
    "AFTERNOON": 3.5,
    "DUSK": 2.5,
    "CLOSING": 0.5,
    "NIGHT": 0.0,
}

DEFAULT_P_REGULAR = {
    "MORNING": 0.15,
    "AFTERNOON": 0.30,
    "DUSK": 0.50,
    "CLOSING": 0.10,
}

def spawn_budget(phase: str, table: Mapping[str, float] | None = None) -> float:
    t = table or DEFAULT_BUDGET
    return float(t.get(phase, 0.0) or 0.0)

def p_regular_attempt(phase: str, table: Mapping[str, float] | None = None) -> float:
    t = table or DEFAULT_P_REGULAR
    return float(t.get(phase, 0.0) or 0.0)

def arrival_interval(phase_limit: float, budget: float, jitter: float, rng) -> float:
    """Mean spacing with ±jitter factor already applied externally."""
    if budget <= 0 or phase_limit <= 0:
        return phase_limit
    base = phase_limit / max(budget, 0.01)
    return base * float(jitter)
# reseal-product R53