import json
from typing import Dict, List
from fastapi import WebSocket

class GlobalConnectionManager:
    def __init__(self):
        self.active_connections: Dict[int, List[WebSocket]] = {}
        self.user_roles: Dict[int, str] = {}
        
    async def connect(self, websocket: WebSocket, user_id: int, role: str):
        await websocket.accept()
        if user_id not in self.active_connections:
            self.active_connections[user_id] = []
        self.active_connections[user_id].append(websocket)
        self.user_roles[user_id] = role

    def disconnect(self, websocket: WebSocket, user_id: int):
        if user_id in self.active_connections:
            self.active_connections[user_id] = [ws for ws in self.active_connections[user_id] if ws != websocket]
            if not self.active_connections[user_id]:
                del self.active_connections[user_id]
                if user_id in self.user_roles:
                    del self.user_roles[user_id]

    async def send_unread_count(self, user_id: int, count: int):
        if user_id in self.active_connections:
            payload = json.dumps({"type": "unread_count", "count": count})
            for ws in self.active_connections[user_id]:
                try:
                    await ws.send_text(payload)
                except:
                    pass

    async def notify_user(self, user_id: int):
        import db
        row = db.execute_query(
            "SELECT count(*) as cnt FROM order_messages om JOIN orders o ON om.order_id = o.id WHERE o.user_id = %s AND om.is_from_admin = TRUE AND om.is_read = FALSE",
            (user_id,)
        )
        count = row[0]['cnt'] if row else 0
        await self.send_unread_count(user_id, count)

    async def broadcast_to_role(self, role_name: str, payload: str):
        for uid, role in self.user_roles.items():
            if role == role_name and uid in self.active_connections:
                for ws in self.active_connections[uid]:
                    try:
                        await ws.send_text(payload)
                    except:
                        pass

    async def notify_admins(self):
        import db
        row = db.execute_query("SELECT count(*) as cnt FROM order_messages WHERE is_from_admin = FALSE AND is_read = FALSE")
        count = row[0]['cnt'] if row else 0
        payload = json.dumps({"type": "unread_count", "count": count})
        await self.broadcast_to_role('admin', payload)

    async def notify_admins_new_message(self, order_id: int, message_text: str):
        hint = (message_text[:50] + '...') if len(message_text) > 50 else message_text
        payload = json.dumps({
            "type": "new_chat_message",
            "order_id": order_id,
            "text": hint
        })
        await self.broadcast_to_role('admin', payload)

    async def notify_order_read(self, order_id: int):
        payload = json.dumps({
            "type": "order_read",
            "order_id": order_id
        })
        await self.broadcast_to_role('admin', payload)

    async def kick_user(self, user_id: int):
        if user_id in self.active_connections:
            payload = json.dumps({"type": "account_suspended"})
            for ws in self.active_connections[user_id]:
                try:
                    await ws.send_text(payload)
                    await ws.close(code=4003) # Custom code for kick
                except:
                    pass
            # Connections will be removed via disconnect() called on close

global_manager = GlobalConnectionManager()