"""审计日志 Hook - Phase 7.2

记录所有工具调用到审计日志。
"""

from typing import Any

from app.agents.tools.hooks.types import (
    ExecutionContext,
    HookResult,
    HookType,
)
from app.agents.tools.manifest import ToolCategory


class AuditLogHook:
    """审计日志 Hook

    记录所有工具调用的详细信息，包括：
    - 调用时间
    - 工具名称
    - 输入参数
    - 执行结果
    - 执行时长
    - 用户 ID
    """

    def __init__(self, log_path: str | None = None):
        """
        Args:
            log_path: 日志文件路径，None 则输出到 stdout
        """
        self.log_path = log_path
        self._logs: list[dict[str, Any]] = []

    async def pre_tool_use(self, context: ExecutionContext) -> HookResult:
        """工具执行前记录"""
        log_entry = {
            "event": "pre_tool",
            "tool_name": context.tool_name,
            "input": context.tool_input,
            "user_id": context.user_id,
            "session_id": context.session_id,
        }
        self._logs.append(log_entry)
        self._write_log(log_entry)
        return HookResult(
            hook_name="audit_log",
            success=True,
            continue_execution=True,
        )

    async def post_tool_use(self, context: ExecutionContext, result: Any) -> HookResult:
        """工具执行后记录"""
        log_entry = {
            "event": "post_tool",
            "tool_name": context.tool_name,
            "result": str(result)[:500] if result else None,
            "duration_ms": (
                (context.end_time - context.start_time) * 1000
                if context.start_time and context.end_time
                else None
            ),
        }
        self._logs.append(log_entry)
        self._write_log(log_entry)
        return HookResult(
            hook_name="audit_log",
            success=True,
            continue_execution=True,
            modified_output=result,
        )

    async def tool_error(self, context: ExecutionContext, error: Exception) -> HookResult:
        """工具出错时记录"""
        log_entry = {
            "event": "tool_error",
            "tool_name": context.tool_name,
            "error": str(error),
            "error_type": type(error).__name__,
        }
        self._logs.append(log_entry)
        self._write_log(log_entry)
        return HookResult(
            hook_name="audit_log",
            success=False,
            continue_execution=True,
            error=str(error),
        )

    def _write_log(self, entry: dict[str, Any]) -> None:
        """写入日志"""
        import json
        import datetime

        entry["timestamp"] = datetime.datetime.now().isoformat()

        if self.log_path:
            try:
                with open(self.log_path, "a", encoding="utf-8") as f:
                    f.write(json.dumps(entry, ensure_ascii=False) + "\n")
            except Exception:
                # 日志写入失败不影响主流程
                pass
        else:
            # 输出到 stdout
            print(f"[AUDIT] {json.dumps(entry, ensure_ascii=False)}")

    def get_logs(self) -> list[dict[str, Any]]:
        """获取所有日志"""
        return self._logs.copy()

    def clear_logs(self) -> None:
        """清空日志"""
        self._logs.clear()