"""
知你客服 Agent 代理 API（方式一：App 后端代理）
"""
from flask import Blueprint, request, jsonify
from flask_jwt_extended import jwt_required, get_jwt_identity
from app.services.agent_proxy import chat_with_agent
from flask import current_app

agent_bp = Blueprint("agent", __name__)


@agent_bp.route("/chat", methods=["POST"])
@jwt_required()
def agent_chat():
    """
    请求体: { "message": "用户输入", "user_id": "可选，App 侧用户唯一 ID，用于多轮记忆" }
    响应:   { "reply": "知你客服回复文本" }
    """
    data = request.get_json() or {}
    message = (data.get("message") or data.get("query") or "").strip()
    if not message:
        return jsonify({"error": "message 不能为空"}), 400
    user_id = data.get("user_id") or get_jwt_identity()
    base_url = current_app.config.get("PLATFORM_BASE_URL", "")
    username = current_app.config.get("PLATFORM_USERNAME", "")
    password = current_app.config.get("PLATFORM_PASSWORD", "")
    agent_id = current_app.config.get("PLATFORM_AGENT_ID", "")
    if not all([base_url, username, password, agent_id]):
        return jsonify({"error": "未配置知你客服代理（PLATFORM_BASE_URL/USERNAME/PASSWORD/AGENT_ID）"}), 503
    try:
        reply = chat_with_agent(base_url, username, password, agent_id, message, user_id)
        return jsonify({"reply": reply or ""})
    except ValueError as e:
        err = str(e)
        if "401" in err or "登录失败" in err:
            return jsonify({"error": err}), 503
        return jsonify({"error": err}), 502
    except Exception as e:
        err = str(e)
        # 任何包含 401/Unauthorized 的异常都视为平台认证失败，返回友好提示
        if "401" in err or "Unauthorized" in err:
            return jsonify({
                "error": "知你客服平台登录失败(401)，请确认 8037 服务已启动且 PLATFORM_USERNAME/PLATFORM_PASSWORD 正确"
            }), 503
        return jsonify({"error": err}), 502