"""Microsoft Teams Proactive Send + Context Revoked 回退。

Conversation Reference 持久化存储，支持主动消息发送。
当 Live Context 过期时自动切换 Proactive Send。
"""

from __future__ import annotations

import abc
import json
import time
from pathlib import Path
from typing import Any, TYPE_CHECKING

from yuxi.channels.models import DeliveryResult
from yuxi.utils.logging_config import logger

if TYPE_CHECKING:
    from .send import MessageSender

CONV_STORE_FILENAME = "msteams-conversations.json"
CONV_STORE_MAX_ENTRIES = 5000


class MSTeamsConversationStore(abc.ABC):
    """Conversation Reference 存储接口抽象。

    支持 FS 和 Memory 两种实现，可通过接口注入切换。
    """

    @abc.abstractmethod
    def store(self, channel_chat_id: str, conversation_ref: dict[str, Any]) -> None: ...

    @abc.abstractmethod
    def get(self, channel_chat_id: str) -> dict[str, Any] | None: ...

    @abc.abstractmethod
    def remove(self, channel_chat_id: str) -> None: ...

    @abc.abstractmethod
    def list_keys(self) -> list[str]: ...

    @property
    @abc.abstractmethod
    def count(self) -> int: ...


class ConversationStore(MSTeamsConversationStore):
    def __init__(self, storage_dir: str | None = None):
        self._storage_dir = Path(storage_dir or str(Path.home() / ".yuxi" / "msteams"))
        self._storage_dir.mkdir(parents=True, exist_ok=True)
        self._entries: dict[str, dict[str, Any]] = {}
        self._load()

    @property
    def file_path(self) -> Path:
        return self._storage_dir / CONV_STORE_FILENAME

    def _load(self) -> None:
        if not self.file_path.exists():
            return
        try:
            data = json.loads(self.file_path.read_text(encoding="utf-8"))
        except (json.JSONDecodeError, OSError):
            return
        self._entries = data.get("entries", {})

    def _save(self) -> None:
        try:
            self.file_path.write_text(
                json.dumps({"entries": self._entries}, ensure_ascii=False, indent=2),
                encoding="utf-8",
            )
        except OSError as e:
            logger.error(f"MSTeams conv_store: failed to save: {e}")

    def store(
        self,
        channel_chat_id: str,
        conversation_ref: dict[str, Any],
    ) -> None:
        self._entries[channel_chat_id] = {
            "ref": conversation_ref,
            "stored_at": time.time(),
        }
        if len(self._entries) > CONV_STORE_MAX_ENTRIES:
            oldest = min(
                self._entries.keys(),
                key=lambda k: self._entries[k].get("stored_at", 0),
                default="",
            )
            if oldest:
                self._entries.pop(oldest, None)
        self._save()

    def get(self, channel_chat_id: str) -> dict[str, Any] | None:
        entry = self._entries.get(channel_chat_id)
        if entry:
            return entry["ref"]
        return None

    def remove(self, channel_chat_id: str) -> None:
        self._entries.pop(channel_chat_id, None)
        self._save()

    def list_keys(self) -> list[str]:
        return list(self._entries.keys())

    @property
    def count(self) -> int:
        return len(self._entries)


class MemoryConversationStore(MSTeamsConversationStore):
    """内存实现的 Conversation Reference 存储，适用于测试或无状态场景。"""

    def __init__(self):
        self._entries: dict[str, dict[str, Any]] = {}

    def store(self, channel_chat_id: str, conversation_ref: dict[str, Any]) -> None:
        self._entries[channel_chat_id] = {
            "ref": conversation_ref,
            "stored_at": time.time(),
        }

    def get(self, channel_chat_id: str) -> dict[str, Any] | None:
        entry = self._entries.get(channel_chat_id)
        if entry:
            return entry["ref"]
        return None

    def remove(self, channel_chat_id: str) -> None:
        self._entries.pop(channel_chat_id, None)

    def list_keys(self) -> list[str]:
        return list(self._entries.keys())

    @property
    def count(self) -> int:
        return len(self._entries)


def extract_conversation_ref(activity: dict[str, Any]) -> dict[str, Any]:
    conversation = activity.get("conversation", {}) or {}
    channel_data = activity.get("channelData") or {}
    tenant_info = channel_data.get("tenant", {}) or {}

    return {
        "activityId": activity.get("id", ""),
        "user": activity.get("from", {}),
        "bot": activity.get("recipient", {}),
        "conversation": conversation,
        "channelId": activity.get("channelId", "msteams"),
        "serviceUrl": activity.get("serviceUrl", ""),
        "locale": activity.get("locale", ""),
        "graphChatId": conversation.get("id", ""),
        "threadId": "",
        "timezone": channel_data.get("timezone", ""),
        "tenantId": tenant_info.get("id", ""),
    }


async def proactive_send(
    sender: MessageSender,
    conv_store: ConversationStore,
    channel_chat_id: str,
    text: str,
) -> DeliveryResult:
    conv_ref = conv_store.get(channel_chat_id)
    if not conv_ref:
        logger.warning(f"MSTeams proactive: no conversation ref for {channel_chat_id}")
        return DeliveryResult(success=False, error="No conversation reference")

    activity: dict[str, Any] = {
        "type": "message",
        "text": text[:4000],
        "textFormat": "markdown",
    }
    return await sender.send_activity(channel_chat_id, activity)


async def send_with_revoked_fallback(
    sender: MessageSender,
    conv_store: ConversationStore,
    channel_chat_id: str,
    text: str,
) -> DeliveryResult:
    result = await sender.send_activity(
        channel_chat_id,
        {"type": "message", "text": text[:4000], "textFormat": "markdown"},
    )
    if result.success:
        return result
    if "403" in (result.error or ""):
        conv_store.remove(channel_chat_id)
    return result