from __future__ import annotations

from yuxi.channels.base import BaseChannelAdapter

_BUILTIN_ADAPTERS: dict[str, type[BaseChannelAdapter]] = {}
_BUILTIN_ADAPTER_ALIASES: dict[str, str] = {}


def register_builtin_adapter(cls: type[BaseChannelAdapter] | None = None, *, aliases: list[str] | None = None):
    def _decorator(cls_inner: type[BaseChannelAdapter]) -> type[BaseChannelAdapter]:
        _BUILTIN_ADAPTERS[cls_inner.channel_id] = cls_inner
        if aliases:
            for alias in aliases:
                _BUILTIN_ADAPTER_ALIASES[alias] = cls_inner.channel_id
        return cls_inner

    if cls is None:
        return _decorator
    return _decorator(cls)


def _load_builtin_adapters():
    if _BUILTIN_ADAPTERS:
        return
    try:
        from yuxi.channels.adapters.webchat import WebChatAdapter

        _BUILTIN_ADAPTERS["webchat"] = WebChatAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.telegram import TelegramAdapter

        _BUILTIN_ADAPTERS["telegram"] = TelegramAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.slack import SlackAdapter

        _BUILTIN_ADAPTERS["slack"] = SlackAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.matrix import MatrixAdapter

        _BUILTIN_ADAPTERS["matrix"] = MatrixAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.mattermost import MattermostAdapter

        _BUILTIN_ADAPTERS["mattermost"] = MattermostAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.nostr import NostrAdapter

        _BUILTIN_ADAPTERS["nostr"] = NostrAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.twitch import TwitchAdapter

        _BUILTIN_ADAPTERS["twitch"] = TwitchAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.imessage import IMessageAdapter

        _BUILTIN_ADAPTERS["imessage"] = IMessageAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.whatsapp import WhatsAppAdapter

        _BUILTIN_ADAPTERS["whatsapp"] = WhatsAppAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.discord import DiscordAdapter

        _BUILTIN_ADAPTERS["discord"] = DiscordAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.irc import IRCAdapter

        _BUILTIN_ADAPTERS["irc"] = IRCAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.dingding import DingDingChannelAdapter

        _BUILTIN_ADAPTERS["dingding"] = DingDingChannelAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.feishu import FeishuAdapter

        _BUILTIN_ADAPTERS["feishu"] = FeishuAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.msteams import MSTeamsAdapter

        _BUILTIN_ADAPTERS["msteams"] = MSTeamsAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.bluebubbles import BlueBubblesAdapter

        _BUILTIN_ADAPTERS["bluebubbles"] = BlueBubblesAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.synologychat import SynologyChatAdapter

        _BUILTIN_ADAPTERS["synologychat"] = SynologyChatAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.nextcloudtalk import NextcloudTalkAdapter

        _BUILTIN_ADAPTERS["nextcloud-talk"] = NextcloudTalkAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.googlechat import GoogleChatAdapter

        _BUILTIN_ADAPTERS["googlechat"] = GoogleChatAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.line import LINEAdapter

        _BUILTIN_ADAPTERS["line"] = LINEAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.qqbot import QQBotAdapter

        _BUILTIN_ADAPTERS["qqbot"] = QQBotAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.signal.channel import SignalChannel

        _BUILTIN_ADAPTERS["signal"] = SignalChannel
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.zalo_user import ZaloUserAdapter

        _BUILTIN_ADAPTERS["zalo_user"] = ZaloUserAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.urbit import UrbitAdapter

        _BUILTIN_ADAPTERS["urbit"] = UrbitAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.zalo_oa import ZaloOAAdapter

        _BUILTIN_ADAPTERS["zalo_oa"] = ZaloOAAdapter
    except ImportError:
        pass
    try:
        from yuxi.channels.adapters.wechat import WeChatAdapter

        _BUILTIN_ADAPTERS["wechat"] = WeChatAdapter
    except ImportError:
        pass


class ChannelRegistry:
    def __init__(self):
        self._adapters: dict[str, type[BaseChannelAdapter]] = {}
        self._alias_map: dict[str, str] = {}

    def _build_alias_map(self) -> None:
        for alias, channel_id in _BUILTIN_ADAPTER_ALIASES.items():
            self._alias_map[alias] = channel_id
        for channel_id, adapter_cls in {**_BUILTIN_ADAPTERS, **self._adapters}.items():
            meta = getattr(adapter_cls, "meta", None)
            if meta and meta.aliases:
                for alias in meta.aliases:
                    self._alias_map[alias] = channel_id

    def get(self, channel_id: str) -> type[BaseChannelAdapter] | None:
        if channel_id in self._adapters:
            return self._adapters[channel_id]
        if channel_id in _BUILTIN_ADAPTERS:
            return _BUILTIN_ADAPTERS[channel_id]
        if not self._alias_map:
            self._build_alias_map()
        resolved = self._alias_map.get(channel_id)
        if resolved:
            return self._adapters.get(resolved) or _BUILTIN_ADAPTERS.get(resolved)
        return None

    def register(self, channel_id: str, adapter_cls: type[BaseChannelAdapter]) -> None:
        self._adapters[channel_id] = adapter_cls

    def list_channels(self) -> list[str]:
        return list({*self._adapters.keys(), *_BUILTIN_ADAPTERS.keys()})

    def unregister(self, channel_id: str) -> None:
        self._adapters.pop(channel_id, None)


BUILTIN_ADAPTERS = _BUILTIN_ADAPTERS