"""One curated, deterministic composition policy; all times are quarter-note beats."""
from __future__ import annotations

import dataclasses
import hashlib
import json

@dataclasses.dataclass(frozen=True)
class Policy:
  acoustic_activity: float = 1.125
  electric_activity: float = 1.375
  active_occupancy: float = 0.75
  arrival_occupancy: float = 0.9
  weights: tuple[tuple[str, float], ...] = (('activity', 4), ('occupancy', 4), ('fidelity', 3), ('landmarks', 3), ('register', 1), ('contour', 1), ('connection', 1), ('repetition', 1), ('movement', 0.5))
  beam_width: int = 64
  extensions: int = 32
  retrieval: int = 32
  alternatives: int = 4

DEFAULT = Policy()

def describe():
  values = dataclasses.asdict(DEFAULT)
  identity = hashlib.sha256(json.dumps(values, sort_keys=True).encode()).hexdigest()
  return {'fingerprint': identity, 'parameters': values}

def stable_rank(seed, value):
  return hashlib.sha256((seed + repr(value)).encode()).hexdigest()