import httpx
import logging
import os
import jwt
import time
from config import settings

logger = logging.getLogger(__name__)

_INTERNAL_BASE = os.getenv("INTERNAL_API_BASE", "http://127.0.0.1:8000/api")
_client: httpx.Client | None = None


def _get_client() -> httpx.Client:
    global _client
    if _client is None:
        _client = httpx.Client(timeout=30)
    return _client


def _get_service_token() -> str | None:
    try:
        payload = {"sub": "system_tool", "exp": int(time.time()) + 3600, "type": "service"}
        token = jwt.encode(payload, settings.JWT_SECRET, algorithm="HS256")
        return token
    except Exception:
        return None


def _headers(token: str | None = None) -> dict:
    t = token or _get_service_token()
    return {"Authorization": f"Bearer {t}"} if t else {}


SCHEMAS = {
    "list_subordinates": {
        "name": "list_subordinates",
        "description": "查询当前用户的下属员工列表",
        "parameters": {"type": "object", "properties": {}}
    },
    "get_employee_dashboard": {
        "name": "get_employee_dashboard",
        "description": "查询指定员工的工作看板数据",
        "parameters": {
            "type": "object",
            "properties": {"employee_id": {"type": "string", "description": "员工ID"}},
            "required": ["employee_id"]
        }
    },
    "generate_efficiency_report": {
        "name": "generate_efficiency_report",
        "description": "生成团队效率分析报告",
        "parameters": {
            "type": "object",
            "properties": {"department_id": {"type": "string", "description": "部门ID（可选）"}}
        }
    },
    "get_task_statistics": {
        "name": "get_task_statistics",
        "description": "查询任务统计数据",
        "parameters": {
            "type": "object",
            "properties": {"employee_id": {"type": "string", "description": "员工ID（可选）"}}
        }
    },
}


def list_subordinates() -> str:
    try:
        resp = _get_client().get(f"{_INTERNAL_BASE}/org/subordinates", headers=_headers())
        users = resp.json() if isinstance(resp.json(), list) else resp.json().get("data", [])
        if not users:
            return "当前没有下属员工数据。"
        lines = ["下属员工列表:"]
        for u in users:
            lines.append(f"- {u.get('display_name', u.get('username', '?'))} | 岗位: {u.get('position', '?')} | 部门: {u.get('department_name', '?')}")
        return "\n".join(lines)
    except Exception as e:
        return f"查询下属列表失败: {e}"


def get_employee_dashboard(employee_id: str) -> str:
    try:
        resp = _get_client().get(f"{_INTERNAL_BASE}/monitor/employee/{employee_id}/dashboard", headers=_headers())
        data = resp.json()
        return f"员工 {employee_id[:8]} 工作看板:\n- 任务完成率: {data.get('completion_rate', '?')}%\n- 平均响应时间: {data.get('avg_response_time', '?')} 分钟\n- 今日任务数: {data.get('today_tasks', 0)}\n- 本周完成: {data.get('weekly_completed', 0)}"
    except Exception as e:
        return f"查询员工看板失败: {e}"


def generate_efficiency_report(department_id: str | None = None) -> str:
    try:
        resp = _get_client().get(f"{_INTERNAL_BASE}/monitor/employees", headers=_headers())
        employees = resp.json() if isinstance(resp.json(), list) else resp.json().get("data", [])
        report = ["=== 团队效率报告 ===\n"]
        total_tasks = 0
        active_employees = 0
        for emp in employees:
            task_count = emp.get("task_count", 0)
            total_tasks += task_count
            if emp.get("status") == "active":
                active_employees += 1
            report.append(f"- {emp.get('display_name', emp.get('username', '?'))}: 任务数={task_count}, 完成率={emp.get('completion_rate', 0)}%")
        report.append(f"\n总结: 活跃员工 {active_employees}/{len(employees)} 人, 总任务 {total_tasks} 个")
        return "\n".join(report)
    except Exception as e:
        return f"生成报告失败: {e}"


def get_task_statistics(employee_id: str | None = None) -> str:
    try:
        resp = _get_client().get(f"{_INTERNAL_BASE}/tasks", headers=_headers())
        tasks = resp.json() if isinstance(resp.json(), list) else resp.json().get("data", [])
        if employee_id:
            tasks = [t for t in tasks if t.get("assignee_id") == employee_id]
        todo = sum(1 for t in tasks if t.get("status") == "todo")
        in_progress = sum(1 for t in tasks if t.get("status") == "in_progress")
        done = sum(1 for t in tasks if t.get("status") == "done")
        return f"任务统计:\n- 待办: {todo}\n- 进行中: {in_progress}\n- 已完成: {done}\n- 总计: {len(tasks)}"
    except Exception as e:
        return f"查询任务统计失败: {e}"


__all__ = ["list_subordinates", "get_employee_dashboard", "generate_efficiency_report", "get_task_statistics", "SCHEMAS"]