"""
DeepSeek A 调用壳：组装 messages + route_decision tool，解析为 RouteDecision。

本文件职责：Worker 槽内跑 A 路由；默认不打外网（需 LLM_DATA_USAGE_CONFIRMED）。
禁止：在企微回调线程同步调用本模块的网络路径。
"""

from __future__ import annotations

import hashlib
import logging
from dataclasses import dataclass
from typing import Any, Optional

from agent.config import Settings, get_settings
from agent.llm.http_client import LlmHttpClient, LlmHttpResult
from agent.llm.modes import LlmMode
from agent.routing.decision import RouteDecision
from agent.routing.ordered_actions import (
    ORDERED_ACTIONS_TOOL_NAME,
    OrderedActionsError,
    extract_tool_arguments_from_chat_raw,
    ordered_actions_tool_definition,
    parse_ordered_actions_arguments,
)

logger = logging.getLogger(__name__)

_SYSTEM = (
    "You are DeepSeek-A for inquiry routing. "
    "You must call the function tool route_decision exactly once. "
    "Do not write user-facing text. Do not extract business fields."
)


def _digest_text(text: str) -> str:
    return hashlib.sha256(text.encode("utf-8")).hexdigest()


@dataclass
class DeepSeekARouter:
    """
    DeepSeek A 路由器。

    allow_network：是否允许真 HTTP；仍受 settings.llm_data_usage_confirmed 约束。
    """

    settings: Settings
    http: LlmHttpClient
    allow_network: bool = False

    @classmethod
    def from_settings(
        cls,
        settings: Optional[Settings] = None,
        *,
        allow_network: bool = False,
    ) -> "DeepSeekARouter":
        cfg = settings or get_settings()
        return cls(
            settings=cfg,
            http=LlmHttpClient.from_settings(cfg),
            allow_network=allow_network,
        )

    def build_messages(self, *, text: str, sender_id: str) -> list[dict[str, Any]]:
        """构造仅含 inbound_facts 的 messages（不做字段抽取）。"""
        facts = {
            "sender_id": sender_id,
            "text": text,
            "text_sha256": _digest_text(text or ""),
        }
        return [
            {"role": "system", "content": _SYSTEM},
            {
                "role": "user",
                "content": (
                    "inbound_facts (JSON-like):\n"
                    f"sender_id={facts['sender_id']}\n"
                    f"text_sha256={facts['text_sha256']}\n"
                    f"text={facts['text']}\n"
                    "Call route_decision once."
                ),
            },
        ]

    def route_from_tool_args(self, args: dict[str, Any] | str) -> RouteDecision:
        """仅解析已有 tool 参数（单测 / stub / 回放）。"""
        return parse_ordered_actions_arguments(args).to_route_decision()

    def route_stub_fixture(self, *, text: str, sender_id: str) -> RouteDecision:
        """
        无外网固定夹具：把非空文本标成 ordinary_text_inquiry。

        仅骨架联调；正式生产必须走模型或已落库的 tool 回放。
        """
        if not sender_id:
            return RouteDecision(intent="reject_no_sender", confidence=1.0)
        content = (text or "").strip()
        if not content:
            return RouteDecision(intent="ignore_empty", confidence=1.0)
        digest = _digest_text(content)
        args = {
            "decision_id": f"STUB-{digest[:16]}",
            "intent": "ordinary_text_inquiry",
            "ordered_action": {
                "action_type": "ORDINARY_TEXT_INQUIRY",
                "order": 1,
                "target": {"work_order_no": ""},
                "evidence": {
                    "source_ref": f"inbound:{sender_id}",
                    "content_digest": digest,
                },
            },
        }
        logger.info("DeepSeekA stub fixture sender=%s", sender_id)
        return self.route_from_tool_args(args)

    def route(self, *, text: str, sender_id: str) -> RouteDecision:
        """
        执行 A 路由。

        无 sender_id → reject；未开网络或未确认数据用途 → stub fixture；
        开网络 → tool_choice 强制 route_decision。
        """
        if not sender_id:
            return RouteDecision(intent="reject_no_sender", confidence=1.0)
        if not self.allow_network or not self.settings.llm_data_usage_confirmed:
            if self.allow_network and not self.settings.llm_data_usage_confirmed:
                logger.warning(
                    "LLM_DATA_USAGE_CONFIRMED 未确认，拒绝打真实 DeepSeek A，改用 stub"
                )
            return self.route_stub_fixture(text=text, sender_id=sender_id)

        messages = self.build_messages(text=text, sender_id=sender_id)
        tools = [ordered_actions_tool_definition()]
        result: LlmHttpResult = self.http.chat(
            mode=LlmMode.ORDERED_ACTIONS,
            messages=messages,
            tools=tools,
            tool_choice={"type": "function", "function": {"name": ORDERED_ACTIONS_TOOL_NAME}},
        )
        if not result.ok:
            logger.warning("DeepSeek A HTTP 失败 err=%s", result.error)
            return RouteDecision(
                intent="route_model_failed",
                confidence=0.0,
                raw={"error": result.error, "provider": result.provider},
            )
        try:
            args = extract_tool_arguments_from_chat_raw(result.raw)
            return self.route_from_tool_args(args)
        except OrderedActionsError as exc:
            logger.warning("DeepSeek A 解析失败: %s", exc)
            return RouteDecision(
                intent="route_parse_failed",
                confidence=0.0,
                raw={"error": str(exc)},
            )