"""IM Agent Tools — 供 Agent 在 tool-use loop 中调用的工具函数。

新架构：一个 Agent (contact_id) = 一个 IMClient 实例，该实例管理多个窗口 (chat_id)。

使用方式:
    1. 调用 setup(contact_id) 初始化 Agent 的 IMClient
    2. 调用 open_window(contact_id, chat_id) 打开窗口
    3. 在每轮 loop 中调用 check_notification(contact_id, chat_id) 检查该窗口的新消息
    4. 有通知时调用 receive_messages(contact_id, chat_id) 读取消息
    5. 发消息调用 send_message(contact_id, chat_id, receiver, content)
"""

import asyncio
import httpx

from client import IMClient
from notifier import AgentNotifier

# ── 全局状态 ──

_clients: dict[str, IMClient] = {}
_tasks: dict[str, asyncio.Task] = {}
_notifications: dict[tuple[str, str], dict] = {}  # (contact_id, chat_id) -> 通知


class _ToolNotifier(AgentNotifier):
    """内部通知器：按 (contact_id, chat_id) 分发通知。"""

    def __init__(self, contact_id: str, chat_id: str):
        self._key = (contact_id, chat_id)

    async def notify(self, count: int, from_contacts: list[str]):
        _notifications[self._key] = {"count": count, "from": from_contacts}


# ── Tool 1: 初始化 Agent ──

def setup(contact_id: str, server_url: str = "ws://localhost:8000", notify_interval: float = 10.0) -> str:
    """初始化一个 Agent 的 IMClient（一个实例管理多个窗口）。

    Args:
        contact_id: Agent 的身份 ID
        server_url: Server 地址
        notify_interval: 检查新消息的间隔秒数

    Returns:
        状态描述
    """
    if contact_id in _clients:
        return f"已连接: {contact_id}"

    client = IMClient(contact_id=contact_id, server_url=server_url, notify_interval=notify_interval)
    _clients[contact_id] = client

    loop = asyncio.get_event_loop()
    _tasks[contact_id] = loop.create_task(client.run())

    return f"已启动 IM Client: {contact_id}"


def teardown(contact_id: str) -> str:
    """停止并移除一个 Agent 的 IMClient。"""
    task = _tasks.pop(contact_id, None)
    if task:
        task.cancel()
    _clients.pop(contact_id, None)
    # 清理该 contact_id 的所有通知
    keys_to_remove = [k for k in _notifications if k[0] == contact_id]
    for k in keys_to_remove:
        _notifications.pop(k, None)
    return f"已停止: {contact_id}"


# ── Tool 2: 窗口管理 ──

def open_window(contact_id: str, chat_id: str | None = None) -> str:
    """为某个 Agent 打开一个新窗口。

    Args:
        contact_id: Agent ID
        chat_id: 窗口 ID（留空自动生成）

    Returns:
        窗口的 chat_id
    """
    client = _clients.get(contact_id)
    if client is None:
        return f"错误: {contact_id} 未初始化"

    actual_chat_id = client.open_window(chat_id=chat_id, notifier=_ToolNotifier(contact_id, chat_id or ""))
    # 更新 notifier 的 chat_id
    if chat_id is None:
        client._notifiers[actual_chat_id] = _ToolNotifier(contact_id, actual_chat_id)

    return actual_chat_id


def close_window(contact_id: str, chat_id: str) -> str:
    """关闭某个窗口。"""
    client = _clients.get(contact_id)
    if client is None:
        return f"错误: {contact_id} 未初始化"

    client.close_window(chat_id)
    _notifications.pop((contact_id, chat_id), None)
    return f"已关闭窗口: {chat_id}"


def list_windows(contact_id: str) -> list[str]:
    """列出某个 Agent 的所有窗口。"""
    client = _clients.get(contact_id)
    if client is None:
        return []
    return client.list_windows()


# ── Tool 3: 检查通知 ──

def check_notification(contact_id: str, chat_id: str) -> dict | None:
    """检查某个窗口是否有新消息通知。

    Returns:
        有新消息: {"count": 3, "from": ["alice", "bob"]}
        没有新消息: None
    """
    return _notifications.pop((contact_id, chat_id), None)


# ── Tool 4: 接收消息 ──

def receive_messages(contact_id: str, chat_id: str) -> list[dict]:
    """读取某个窗口的待处理消息，读取后自动清空。

    Returns:
        消息列表，每条格式:
        {
            "sender": "alice",
            "sender_chat_id": "...",
            "content": "你好",
            "msg_type": "chat"
        }
    """
    client = _clients.get(contact_id)
    if client is None:
        return []

    raw = client.read_pending(chat_id)
    return [
        {
            "sender": m.get("sender", "unknown"),
            "sender_chat_id": m.get("sender_chat_id"),
            "content": m.get("content", ""),
            "msg_type": m.get("msg_type", "chat"),
        }
        for m in raw
    ]


# ── Tool 5: 发送消息 ──

def send_message(
    contact_id: str,
    chat_id: str,
    receiver: str,
    content: str,
    msg_type: str = "chat",
    receiver_chat_id: str | None = None,
) -> str:
    """从某个窗口发送消息。

    Args:
        contact_id: 发送方 Agent ID
        chat_id: 发送方窗口 ID
        receiver: 接收方 contact_id
        content: 消息内容
        msg_type: 消息类型
        receiver_chat_id: 接收方窗口 ID（不指定则广播）

    Returns:
        状态描述
    """
    client = _clients.get(contact_id)
    if client is None:
        return f"错误: {contact_id} 未初始化"

    client.send_message(chat_id, receiver, content, msg_type, receiver_chat_id)
    target = f"{receiver}:{receiver_chat_id}" if receiver_chat_id else f"{receiver}:*"
    return f"[{contact_id}:{chat_id}] 已发送给 {target}: {content[:50]}"


# ── Tool 6: 查询联系人 ──

def get_contacts(contact_id: str, server_http_url: str = "http://localhost:8000") -> dict:
    """查询某个 Agent 的联系人列表和在线用户。"""
    if contact_id not in _clients:
        return {"error": f"{contact_id} 未初始化"}

    result = {}
    with httpx.Client() as http:
        try:
            r = http.get(f"{server_http_url}/contacts/{contact_id}")
            result["contacts"] = r.json().get("contacts", [])
        except Exception as e:
            result["contacts_error"] = str(e)

        try:
            r = http.get(f"{server_http_url}/health")
            result["online"] = r.json().get("online", {})
        except Exception as e:
            result["online_error"] = str(e)

    return result


# ── Tool 7: 查询聊天历史 ──

def get_chat_history(contact_id: str, chat_id: str, peer_id: str | None = None, limit: int = 20) -> list[dict]:
    """查询某个窗口的聊天历史。"""
    client = _clients.get(contact_id)
    if client is None:
        return []

    return client.get_chat_history(chat_id, peer_id, limit)