"""Structured audit log for AGI — full transparency layer.

Every material decision, tool call, self-improvement action, advisory
override, and ethical learning event is captured here.  The audit log
is the system's conscience: it doesn't prevent action, but ensures
every action is visible and traceable.  Trust is earned through
transparency.
"""

from __future__ import annotations

import uuid
from typing import Any

from fusionagi._logger import logger
from fusionagi.schemas.audit import AuditEntry, AuditEventType


class AuditLog:
    """Append-only audit log with indexed retrieval.

    All governance decisions, self-improvement iterations, ethical
    learning events, and advisory overrides are recorded here.

    Args:
        max_entries: Maximum entries to retain in memory (FIFO eviction).
    """

    def __init__(self, max_entries: int = 100_000) -> None:
        self._entries: list[AuditEntry] = []
        self._max_entries = max_entries
        self._by_task: dict[str | None, list[int]] = {}
        self._by_type: dict[str, list[int]] = {}
        self._by_actor: dict[str, list[int]] = {}

    def append(
        self,
        event_type: AuditEventType,
        actor: str,
        action: str = "",
        task_id: str | None = None,
        payload: dict[str, Any] | None = None,
        outcome: str = "",
    ) -> str:
        """Record an audit event with full context.

        Args:
            event_type: Category of event.
            actor: Agent or system component responsible.
            action: Specific action taken.
            task_id: Associated task (if any).
            payload: Arbitrary structured data.
            outcome: Result description.

        Returns:
            The generated entry ID.
        """
        entry_id = str(uuid.uuid4())
        entry = AuditEntry(
            entry_id=entry_id,
            event_type=event_type,
            actor=actor,
            task_id=task_id,
            action=action,
            payload=payload or {},
            outcome=outcome,
        )
        if len(self._entries) >= self._max_entries:
            self._entries.pop(0)
        idx = len(self._entries)
        self._entries.append(entry)
        if entry.task_id:
            self._by_task.setdefault(entry.task_id, []).append(idx)
        self._by_type.setdefault(entry.event_type.value, []).append(idx)
        self._by_actor.setdefault(entry.actor, []).append(idx)

        logger.debug(
            "Audit: event recorded",
            extra={
                "entry_id": entry_id,
                "event_type": event_type.value,
                "actor": actor,
                "action": action,
                "outcome": outcome,
            },
        )
        return entry_id

    def get_by_task(self, task_id: str, limit: int = 100) -> list[AuditEntry]:
        """Return recent audit entries for a specific task."""
        indices = self._by_task.get(task_id, [])[-limit:]
        return [self._entries[i] for i in indices if i < len(self._entries)]

    def get_by_type(self, event_type: AuditEventType, limit: int = 100) -> list[AuditEntry]:
        """Return recent audit entries of a specific type."""
        indices = self._by_type.get(event_type.value, [])[-limit:]
        return [self._entries[i] for i in indices if i < len(self._entries)]

    def get_by_actor(self, actor: str, limit: int = 100) -> list[AuditEntry]:
        """Return recent audit entries by a specific actor."""
        indices = self._by_actor.get(actor, [])[-limit:]
        return [self._entries[i] for i in indices if i < len(self._entries)]

    def get_advisories(self, limit: int = 100) -> list[AuditEntry]:
        """Return recent advisory events (governance overrides in advisory mode)."""
        return self.get_by_type(AuditEventType.ADVISORY, limit=limit)

    def get_self_improvements(self, limit: int = 100) -> list[AuditEntry]:
        """Return recent self-improvement events."""
        return self.get_by_type(AuditEventType.SELF_IMPROVEMENT, limit=limit)

    def get_ethical_learning(self, limit: int = 100) -> list[AuditEntry]:
        """Return recent ethical learning events."""
        return self.get_by_type(AuditEventType.ETHICAL_LEARNING, limit=limit)

    def get_recent(self, limit: int = 100) -> list[AuditEntry]:
        """Return the most recent entries regardless of type."""
        return list(self._entries[-limit:])

    @property
    def total_entries(self) -> int:
        """Total number of entries in the log."""
        return len(self._entries)