import httpx
import logging
import os

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_token() -> str | None:
    from config import settings
    try:
        resp = _get_client().post(
            f"{_INTERNAL_BASE}/auth/login",
            json={"username": "admin", "password": "admin123"},
        )
        data = resp.json()
        return data.get("access_token")
    except Exception:
        return None


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


def list_tasks(status: 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 status:
            tasks = [t for t in tasks if t.get("status") == status]
        if not tasks:
            return "当前没有任务。"
        lines = []
        for t in tasks:
            lines.append(
                f"- [{t.get('status', '?')}] {t.get('id', '')[:8]} | {t.get('title', '无标题')} "
                f"| 负责人: {t.get('assignee_name', t.get('assignee_id', '无人'))} "
                f"| 截止: {t.get('deadline', '无')} "
                f"| 优先级: {t.get('priority', '?')}"
            )
        return "\n".join(lines)
    except Exception as e:
        return f"查询任务列表失败: {e}"


def create_task(title: str, description: str = "", assignee_id: str = "", priority: str = "medium", deadline: str | None = None) -> str:
    try:
        body = {
            "title": title,
            "description": description,
            "assignee_id": assignee_id,
            "priority": priority,
            "deadline": deadline,
        }
        resp = _get_client().post(f"{_INTERNAL_BASE}/tasks", json=body, headers=_headers())
        task = resp.json()
        return f"任务创建成功: {task.get('title', title)} (ID: {task.get('id', '?')[:8]})"
    except Exception as e:
        return f"创建任务失败: {e}"


def get_task(task_id: str) -> str:
    try:
        resp = _get_client().get(f"{_INTERNAL_BASE}/tasks/{task_id}", headers=_headers())
        t = resp.json()
        return (
            f"任务: {t.get('title', '?')}\n"
            f"描述: {t.get('description', '无')}\n"
            f"负责人: {t.get('assignee_name', t.get('assignee_id', '无人'))}\n"
            f"状态: {t.get('status', '?')} | 优先级: {t.get('priority', '?')} | 截止: {t.get('deadline', '无')}"
        )
    except Exception as e:
        return f"查询任务失败: {e}"


def update_task(task_id: str, status: str | None = None, description: str | None = None) -> str:
    try:
        body = {}
        if status:
            body["status"] = status
        if description:
            body["description"] = description
        resp = _get_client().put(f"{_INTERNAL_BASE}/tasks/{task_id}", json=body, headers=_headers())
        return f"任务 {task_id[:8]} 已更新"
    except Exception as e:
        return f"更新任务失败: {e}"


def push_task_to_wecom(task_id: str) -> str:
    try:
        resp = _get_client().post(f"{_INTERNAL_BASE}/tasks/{task_id}/push", headers=_headers())
        data = resp.json() if hasattr(resp, 'json') else resp
        return f"任务 {task_id[:8]} 已推送至企业微信"
    except Exception as e:
        return f"推送任务失败: {e}"


__all__ = ["list_tasks", "create_task", "get_task", "update_task", "push_task_to_wecom"]