"""phase-memory bridge for ops-warden cross-runtime experiential memory."""

from __future__ import annotations

import os
from typing import Any, Mapping, Optional

_PHASE_MEMORY_ERROR = (
    "phase-memory is required for warden memory commands. "
    "From ~/ops-warden run: make install-memory (or make install-all). "
    "Dev fallback: PYTHONPATH=../phase-memory/src"
)

# In-process cache: implicit activation is default; no separate `warden memory activate`
# is required for normal route/access/worker/sign use within one CLI invocation tree.
_CONTEXT_CACHE: dict[str, Any] | None = None
_CONTEXT_CACHE_KEY: tuple[str, str] = ("", "")


def _invalidate_context_cache() -> None:
    global _CONTEXT_CACHE, _CONTEXT_CACHE_KEY
    _CONTEXT_CACHE = None
    _CONTEXT_CACHE_KEY = ("", "")


def _phase_memory():
    try:
        import phase_memory.ops_warden as pm

        return pm
    except ImportError as exc:  # pragma: no cover - exercised via tests with PYTHONPATH
        raise RuntimeError(_PHASE_MEMORY_ERROR) from exc


def memory_available() -> bool:
    try:
        _phase_memory()
        return True
    except RuntimeError:
        return False


def enabled(environ: Mapping[str, str] | None = None) -> bool:
    environ = environ or os.environ
    return str(environ.get("WARDEN_MEMORY", "1")).strip().lower() not in {"0", "false", "no", "off"}


def store_path(environ: Mapping[str, str] | None = None):
    return _phase_memory().default_memory_store_path(environ)


def session_kind(environ: Mapping[str, str] | None = None) -> str:
    return _phase_memory().resolve_session_kind(environ)


def status(environ: Mapping[str, str] | None = None) -> dict[str, Any]:
    pm = _phase_memory()
    return pm.OpsWardenMemoryStore.open(environ=environ).status()


def memory_context_summary(activation: dict[str, Any] | None) -> dict[str, Any]:
    if not activation:
        return {"enabled": False}
    return {
        "enabled": True,
        "implicit": bool(activation.get("implicit")),
        "session_kind": activation.get("session_kind", ""),
        "episode_count": activation.get("episode_count", 0),
        "stabilized_route_id": (activation.get("stabilized_route") or {}).get("route_id", ""),
        "llm_calls_avoided": bool(activation.get("llm_calls_avoided")),
        "selected_episode_count": len(activation.get("selected_episodes") or ()),
    }


def ensure_memory_context(
    need: str = "",
    *,
    agent: Optional[str] = None,
    session_id: str = "",
    environ: Mapping[str, str] | None = None,
    implicit: bool = True,
) -> dict[str, Any] | None:
    """Load coordination memory for the current session (default, no extra command)."""
    global _CONTEXT_CACHE, _CONTEXT_CACHE_KEY

    if not enabled(environ):
        return None
    if not memory_available():
        return None
    pm = _phase_memory()
    env = dict(environ or os.environ)
    if agent:
        env["WARDEN_AGENT_ID"] = agent
    kind = pm.resolve_session_kind(env)
    fingerprint = pm.need_fingerprint(need) if need else ""
    cache_key = (kind, fingerprint)
    if _CONTEXT_CACHE is not None and _CONTEXT_CACHE_KEY == cache_key:
        return _CONTEXT_CACHE
    try:
        activation = activate(need=need, agent=agent, session_id=session_id, environ=env)
    except RuntimeError:
        return None
    activation = {**activation, "implicit": implicit}
    _CONTEXT_CACHE = activation
    _CONTEXT_CACHE_KEY = cache_key
    return activation


def activate(
    *,
    need: str = "",
    agent: Optional[str] = None,
    session_id: str = "",
    environ: Mapping[str, str] | None = None,
    implicit: bool = False,
) -> dict[str, Any]:
    pm = _phase_memory()
    env = dict(environ or os.environ)
    if agent:
        env["WARDEN_AGENT_ID"] = agent
    kind = pm.resolve_session_kind(env)
    activation = pm.activate_ops_warden_memory(
        pm.OpsWardenMemoryStore.open(environ=env),
        session_kind=kind,
        need=need,
        session_id=session_id,
    )
    if implicit:
        activation = {**activation, "implicit": True}
    return activation


def record_command_episode(
    *,
    command: str,
    outcome: str,
    need: str = "",
    route_id: str = "",
    diagnostic_codes: Optional[list[str]] = None,
    metadata: Optional[dict[str, Any]] = None,
    environ: Mapping[str, str] | None = None,
) -> dict[str, Any]:
    if not enabled(environ):
        return {"valid": True, "skipped": True, "reason": "WARDEN_MEMORY=0"}
    pm = _phase_memory()
    env = dict(environ or os.environ)
    event = pm.build_session_event(
        command=command,
        session_kind=pm.resolve_session_kind(env),
        outcome=outcome,
        need=need,
        route_id=route_id,
        agent_id=str(env.get("WARDEN_AGENT_ID") or ""),
        session_id=str(env.get("WARDEN_SESSION_ID") or ""),
        diagnostic_codes=diagnostic_codes,
        metadata=metadata,
    )
    result = pm.record_session_event(pm.OpsWardenMemoryStore.open(environ=env), event)
    if result.get("valid"):
        _invalidate_context_cache()
    return result


def worker_activation_context(need: str = "", environ: Mapping[str, str] | None = None) -> dict[str, Any]:
    env = dict(environ or os.environ)
    env["WARDEN_SESSION_KIND"] = "warden.worker"
    return ensure_memory_context(need=need, environ=env, implicit=True) or activate(need=need, environ=env, implicit=True)


def stabilized_route_for_need(need: str, environ: Mapping[str, str] | None = None) -> Optional[dict[str, Any]]:
    pm = _phase_memory()
    store = pm.OpsWardenMemoryStore.open(environ=environ)
    return pm.stabilized_route_match(store.list_events(), need=need)


def format_activation_summary(activation: dict[str, Any]) -> str:
    lines = [
        f"store: {activation.get('episode_count', 0)} episodes",
        f"session_kind: {activation.get('session_kind', '')}",
        f"selected: {len(activation.get('selected_episodes', ()) )}",
    ]
    stabilized = activation.get("stabilized_route")
    if stabilized:
        lines.append(
            f"stabilized: {stabilized.get('route_id')} ({stabilized.get('confirmations')} confirmations)"
        )
    if activation.get("llm_calls_avoided"):
        lines.append("llm_calls_avoided: true")
    return "\n".join(lines)