"""
Trace 元数据以 Agent API（HTTP）为准；Gateway 在 Agent 返回 trace_id 后通过 ``bind_agent_trace`` 登记引用。

``get_trace`` / ``list_traces``：优先请求 Agent API，失败时返回本地登记信息。
"""

from __future__ import annotations

import logging
from typing import Any

import httpx

from utils.env_parse import env_float, env_str

from gateway.core.lifecycle.errors import LifecycleError
from gateway.core.lifecycle.workspace import WorkspaceManager

logger = logging.getLogger(__name__)


class TraceManager:
    def __init__(
        self,
        *,
        workspace_manager: WorkspaceManager,
        agent_api_base_url: str,
        http_timeout: float,
    ) -> None:
        self._wm = workspace_manager
        self._base = agent_api_base_url.rstrip("/")
        self._timeout = http_timeout
        self._local_meta: dict[str, dict[str, Any]] = {}

    @classmethod
    def from_env(cls, workspace_manager: WorkspaceManager) -> TraceManager:
        return cls(
            workspace_manager=workspace_manager,
            agent_api_base_url=env_str("GATEWAY_AGENT_API_BASE_URL", "http://127.0.0.1:8000"),
            http_timeout=env_float("GATEWAY_AGENT_API_TIMEOUT", 60.0),
        )

    async def prepare_workspace_session(self, workspace_id: str) -> None:
        await self._wm.ensure_session(workspace_id)

    async def bind_agent_trace(
        self,
        workspace_id: str,
        agent_trace_id: str,
        agent_type: str,
        metadata: dict[str, Any] | None = None,
    ) -> None:
        await self._wm.add_trace_ref(workspace_id, agent_trace_id)
        self._local_meta[agent_trace_id] = {
            "trace_id": agent_trace_id,
            "workspace_id": workspace_id,
            "agent_type": agent_type,
            "metadata": dict(metadata or {}),
            "agent_api_status": "bound",
        }

    async def release_agent_trace(self, workspace_id: str, agent_trace_id: str) -> None:
        """解除 Trace 与 Workspace 的绑定（Gateway 本地登记 + meta 引用）。"""
        await self._wm.remove_trace_ref(workspace_id, agent_trace_id)
        self._local_meta.pop(agent_trace_id, None)

    async def get_trace(self, trace_id: str) -> dict[str, Any]:
        async with httpx.AsyncClient(timeout=self._timeout) as client:
            try:
                r = await client.get(f"{self._base}/api/traces/{trace_id}")
                if r.status_code == 200:
                    body = r.json()
                    trace = body.get("trace")
                    if isinstance(trace, dict):
                        return {"source": "agent_api", **trace}
            except httpx.RequestError as e:
                logger.warning("TraceManager.get_trace HTTP 失败 trace_id=%s err=%s", trace_id, e)

        local = self._local_meta.get(trace_id)
        if local:
            return {"source": "gateway_local", **local}
        wid = self._wm.get_workspace_id_for_trace(trace_id)
        if wid:
            return {
                "source": "gateway_local",
                "trace_id": trace_id,
                "workspace_id": wid,
                "agent_api_status": "unknown",
            }
        raise LifecycleError(f"Trace 不存在: {trace_id}")

    async def list_traces(
        self,
        workspace_id: str | None = None,
        agent_type: str | None = None,
        *,
        limit: int = 50,
    ) -> list[dict[str, Any]]:
        params: dict[str, str | int] = {"limit": min(limit, 100)}
        if agent_type:
            params["agent_type"] = agent_type
        # Agent API 使用 uid 过滤；飞书侧 uid 常为裸 user_id，workspace_id 形如 feishu:<uid>
        if workspace_id and ":" in workspace_id:
            prefix, _, rest = workspace_id.partition(":")
            if prefix == "feishu" and rest:
                params["uid"] = rest

        async with httpx.AsyncClient(timeout=self._timeout) as client:
            try:
                r = await client.get(f"{self._base}/api/traces", params=params)
                if r.status_code == 200:
                    data = r.json()
                    traces = data.get("traces")
                    if isinstance(traces, list):
                        return traces
            except httpx.RequestError as e:
                logger.warning("TraceManager.list_traces HTTP 失败 err=%s", e)

        if workspace_id:
            return [m for m in self._local_meta.values() if m.get("workspace_id") == workspace_id]
        return list(self._local_meta.values())

    def get_workspace_id(self, trace_id: str) -> str:
        wid = self._wm.get_workspace_id_for_trace(trace_id)
        if wid:
            return wid
        m = self._local_meta.get(trace_id)
        if m and m.get("workspace_id"):
            return str(m["workspace_id"])
        raise LifecycleError(f"无法解析 Trace 的 workspace_id: {trace_id}")