from typing import List, Optional
from app.notifications.base import NotificationProvider
from app.config import settings


class NotificationManager:
    _instance = None

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super().__new__(cls)
            cls._instance._initialized = False
        return cls._instance

    def __init__(self):
        if self._initialized:
            return
        self.providers: List[NotificationProvider] = []
        self._initialized = True

    def add_provider(self, provider: NotificationProvider):
        self.providers.append(provider)

    async def send_notification(self, title: str, content: str):
        for provider in self.providers:
            try:
                await provider.send(title, content)
            except Exception:
                pass

    def load_providers(self):
        from app.notifications.serverchan import ServerChanProvider
        from app.notifications.pushplus import PushPlusProvider

        if "serverchan" in settings.NOTIFICATION_PROVIDERS:
            provider = ServerChanProvider()
            if provider.validate_config():
                self.add_provider(provider)

        if "pushplus" in settings.NOTIFICATION_PROVIDERS:
            provider = PushPlusProvider()
            if provider.validate_config():
                self.add_provider(provider)


notification_manager = NotificationManager()