"""Self-correction: on failure, run reflection and optionally prepare retry with feedback."""

from typing import Any, Protocol

from fusionagi.schemas.task import TaskState
from fusionagi.schemas.recommendation import Recommendation, RecommendationKind
from fusionagi._logger import logger


class StateManagerLike(Protocol):
    """Protocol for state manager: get task state, trace, task."""

    def get_task_state(self, task_id: str) -> TaskState | None: ...
    def get_trace(self, task_id: str) -> list[dict[str, Any]]: ...
    def get_task(self, task_id: str) -> Any: ...


class OrchestratorLike(Protocol):
    """Protocol for orchestrator: get plan, set state (for retry)."""

    def get_task_plan(self, task_id: str) -> dict[str, Any] | None: ...
    def set_task_state(self, task_id: str, state: TaskState, force: bool = False) -> None: ...
    def set_task_plan(self, task_id: str, plan: dict[str, Any]) -> None: ...


class CriticLike(Protocol):
    """Protocol for critic: handle_message with evaluate_request -> evaluation_ready."""

    identity: str

    def handle_message(self, envelope: Any) -> Any | None: ...


def run_reflection_on_failure(
    critic_agent: CriticLike,
    task_id: str,
    state_manager: StateManagerLike,
    orchestrator: OrchestratorLike,
) -> dict[str, Any] | None:
    """
    Run reflection (Critic evaluation) for a failed task.
    Returns evaluation dict or None.
    """
    from fusionagi.schemas.messages import AgentMessage, AgentMessageEnvelope

    trace = state_manager.get_trace(task_id)
    plan = orchestrator.get_task_plan(task_id)
    envelope = AgentMessageEnvelope(
        message=AgentMessage(
            sender="self_correction",
            recipient=critic_agent.identity,
            intent="evaluate_request",
            payload={
                "outcome": "failed",
                "trace": trace,
                "plan": plan,
            },
        ),
        task_id=task_id,
    )
    response = critic_agent.handle_message(envelope)
    if not response or response.message.intent != "evaluation_ready":
        return None
    return response.message.payload.get("evaluation", {})


class SelfCorrectionLoop:
    """
    Self-correction: on failed tasks, run Critic reflection and optionally
    prepare retry by transitioning FAILED -> PENDING and storing correction context.
    """

    def __init__(
        self,
        state_manager: StateManagerLike,
        orchestrator: OrchestratorLike,
        critic_agent: CriticLike,
        max_retries_per_task: int = 2,
    ) -> None:
        """
        Initialize the self-correction loop.

        Args:
            state_manager: State manager for task state and traces.
            orchestrator: Orchestrator for plan and state transitions.
            critic_agent: Critic agent for evaluate_request -> evaluation_ready.
            max_retries_per_task: Maximum retries to suggest per task (default 2).
        """
        self._state = state_manager
        self._orchestrator = orchestrator
        self._critic = critic_agent
        self._max_retries = max_retries_per_task
        self._retry_counts: dict[str, int] = {}

    def suggest_retry(self, task_id: str) -> tuple[bool, dict[str, Any]]:
        """
        For a failed task, run reflection and decide whether to suggest retry.
        Returns (should_retry, correction_context).
        """
        state = self._state.get_task_state(task_id)
        if state != TaskState.FAILED:
            return False, {}
        retries = self._retry_counts.get(task_id, 0)
        if retries >= self._max_retries:
            logger.info(
                "Self-correction: max retries reached",
                extra={"task_id": task_id, "retries": retries},
            )
            return False, {}
        evaluation = run_reflection_on_failure(
            self._critic, task_id, self._state, self._orchestrator,
        )
        if not evaluation:
            return False, {}
        suggestions = evaluation.get("suggestions", [])
        error_analysis = evaluation.get("error_analysis", [])
        should_retry = bool(suggestions or evaluation.get("score", 0) < 0.5)
        context = {
            "evaluation": evaluation,
            "suggestions": suggestions,
            "error_analysis": error_analysis,
            "retry_count": retries + 1,
        }
        return should_retry, context

    def prepare_retry(self, task_id: str, correction_context: dict[str, Any] | None = None) -> None:
        """
        Transition task from FAILED to PENDING and store correction context in plan.
        If correction_context is None, runs suggest_retry to obtain it.
        """
        state = self._state.get_task_state(task_id)
        if state != TaskState.FAILED:
            logger.warning("Self-correction: prepare_retry called for non-failed task", extra={"task_id": task_id})
            return
        if correction_context is None:
            ok, correction_context = self.suggest_retry(task_id)
            if not ok:
                return
        plan = self._orchestrator.get_task_plan(task_id) or {}
        plan = dict(plan)
        plan["_correction_context"] = correction_context
        self._orchestrator.set_task_plan(task_id, plan)
        self._orchestrator.set_task_state(task_id, TaskState.PENDING, force=True)
        self._retry_counts[task_id] = self._retry_counts.get(task_id, 0) + 1
        logger.info("Self-correction: prepared retry", extra={"task_id": task_id, "retry_count": self._retry_counts[task_id]})

    def correction_recommendations(self, task_id: str) -> list[Recommendation]:
        """For a failed task, run reflection and return structured recommendations."""
        evaluation = run_reflection_on_failure(
            self._critic, task_id, self._state, self._orchestrator,
        )
        if not evaluation:
            return []
        suggestions = evaluation.get("suggestions", [])
        error_analysis = evaluation.get("error_analysis", [])
        recs: list[Recommendation] = []
        for i, s in enumerate(suggestions[:10]):
            recs.append(
                Recommendation(
                    kind=RecommendationKind.NEXT_ACTION,
                    title=f"Correction suggestion {i + 1}",
                    description=s if isinstance(s, str) else str(s),
                    payload={"raw": s, "error_analysis": error_analysis},
                    source_task_id=task_id,
                    priority=7,
                )
            )
        return recs