"""
Notification Manager
====================
Phase 6: leWOOOgo Output Plugins

管理所有 NotificationProvider，統一發送介面
"""

from src.core.logging import get_logger

from .base import (
    NotificationMessage,
    NotificationProvider,
    NotificationResult,
    NotificationStatus,
)
from .discord import DiscordWebhookProvider

logger = get_logger("awoooi.notifications.manager")


class NotificationManager:
    """
    通知管理器

    管理多個 NotificationProvider，支援:
    - 同時發送至多個頻道
    - 優雅降級 (單一 Provider 失敗不影響其他)
    - 結果追蹤
    """

    def __init__(self):
        self._providers: list[NotificationProvider] = []
        self._initialized = False

    def register(self, provider: NotificationProvider) -> None:
        """註冊 Provider"""
        if provider.enabled:
            self._providers.append(provider)
            logger.info(
                "notification_provider_registered",
                provider=provider.name,
                enabled=provider.enabled,
            )
        else:
            logger.warning(
                "notification_provider_disabled",
                provider=provider.name,
            )

    def initialize(self) -> None:
        """初始化所有 Provider"""
        if self._initialized:
            return

        # 註冊 Discord
        discord = DiscordWebhookProvider()
        self.register(discord)

        # TODO: 註冊其他 Provider
        # slack = SlackWebhookProvider()
        # self.register(slack)

        self._initialized = True
        logger.info(
            "notification_manager_initialized",
            provider_count=len(self._providers),
            providers=[p.name for p in self._providers],
        )

    async def send_all(self, message: NotificationMessage) -> list[NotificationResult]:
        """
        發送通知至所有已註冊的 Provider

        Returns:
            list[NotificationResult]: 各 Provider 的發送結果
        """
        if not self._initialized:
            self.initialize()

        if not self._providers:
            logger.warning("no_notification_providers_available")
            return [
                NotificationResult(
                    status=NotificationStatus.SKIPPED,
                    provider="none",
                    message="No notification providers configured",
                )
            ]

        results = []
        for provider in self._providers:
            try:
                result = await provider.send(message)
                results.append(result)
                logger.info(
                    "notification_sent",
                    provider=provider.name,
                    status=result.status.value,
                )
            except Exception as e:
                logger.exception(
                    "notification_send_failed",
                    provider=provider.name,
                    error=str(e),
                )
                results.append(
                    NotificationResult(
                        status=NotificationStatus.FAILED,
                        provider=provider.name,
                        message="Exception during send",
                        error=str(e),
                    )
                )

        return results

    async def test_all(self) -> dict[str, bool]:
        """
        測試所有 Provider 連線

        Returns:
            dict[str, bool]: Provider 名稱 → 連線狀態
        """
        if not self._initialized:
            self.initialize()

        results = {}
        for provider in self._providers:
            try:
                results[provider.name] = await provider.test_connection()
            except Exception as e:
                logger.error(
                    "notification_test_failed",
                    provider=provider.name,
                    error=str(e),
                )
                results[provider.name] = False

        return results

    async def close(self) -> None:
        """關閉所有 Provider"""
        for provider in self._providers:
            if hasattr(provider, "close"):
                await provider.close()


# =============================================================================
# Singleton Instance
# =============================================================================

_notification_manager: NotificationManager | None = None


def get_notification_manager() -> NotificationManager:
    """取得 NotificationManager 單例"""
    global _notification_manager
    if _notification_manager is None:
        _notification_manager = NotificationManager()
        _notification_manager.initialize()
    return _notification_manager


async def close_notification_manager() -> None:
    """關閉 NotificationManager"""
    global _notification_manager
    if _notification_manager:
        await _notification_manager.close()
        _notification_manager = None