from __future__ import annotations

# Grammatica JSON Schema (Phase 1, post S-expression refactor).
#
# Distinzione strutturale:
#   * Nodi OPERATORE  -> dict con chiave ``"op"``  (logici, comparatori, crossover)
#   * Nodi LEAF       -> dict con chiave ``"kind"`` (indicator, feature, literal)
# ``op`` e ``kind`` sono mutuamente esclusivi sullo stesso nodo.

LOGICAL_OPS: frozenset[str] = frozenset({"and", "or", "not"})
COMPARATOR_OPS: frozenset[str] = frozenset({"gt", "lt", "eq"})
CROSSOVER_OPS: frozenset[str] = frozenset({"crossover", "crossunder"})

ACTION_VALUES: frozenset[str] = frozenset(
    {"entry-long", "entry-short", "exit", "flat"}
)
KIND_VALUES: frozenset[str] = frozenset({"indicator", "feature", "literal"})

KNOWN_INDICATORS: frozenset[str] = frozenset(
    {"sma", "rsi", "atr", "macd", "realized_vol"}
)
KNOWN_FEATURES: frozenset[str] = frozenset(
    {"open", "high", "low", "close", "volume"}
)

# Convenience union (utile a validator / parser).
ALL_OPS: frozenset[str] = LOGICAL_OPS | COMPARATOR_OPS | CROSSOVER_OPS