from __future__ import annotations

import asyncio
import json
import logging
import time
from collections.abc import AsyncIterator
from typing import Any

import httpx

from yuxi.channels.base import BaseChannelAdapter
from yuxi.channels.capabilities import ChannelCapabilities
from yuxi.channels.exceptions import ChannelAuthenticationError
from yuxi.channels.infra.circuit_breaker import CircuitBreaker, CircuitBreakerOpenError
from yuxi.channels.meta import ChannelMeta
from yuxi.channels.models import (
    ChannelAccountSnapshot,
    ChannelMessage,
    ChannelResponse,
    ChannelStatus,
    ChannelType,
    DeliveryResult,
    HealthStatus,
    TokenStatus,
)
from yuxi.channels.registry import register_builtin_adapter
from yuxi.utils.datetime_utils import utc_now_naive

from .cards import TEXT_CHUNK_LIMIT
from .dedup import DingDingDedupGuard
from .formatter import format_outbound
from .media import download_media as _download_media
from .media import send_media as _send_media
from .media import upload_media
from .normalizer import normalize_inbound
from .policy import DingDingPolicyMatcher
from .send import send_card, send_markdown, send_text
from .sign import verify_webhook_signature as verify_sign
from .stream import DingDingStreamManager
from .token import DingDingTokenManager

logger = logging.getLogger(__name__)

HAS_DINGTALK_STREAM = False
try:
    import dingtalk_stream

    HAS_DINGTALK_STREAM = True
except ImportError:
    dingtalk_stream = None  # type: ignore[assignment]

DINGDING_RATE_LIMIT_PER_MINUTE = 20
STREAM_RECONNECT_DELAY_S = 5
STREAM_MAX_RECONNECT_DELAY_S = 300


@register_builtin_adapter
class DingDingChannelAdapter(BaseChannelAdapter):
    channel_id = "dingding"
    channel_type = ChannelType.DINGDING

    text_chunk_limit = TEXT_CHUNK_LIMIT
    supports_markdown = True
    supports_streaming = True
    streaming_modes = ["off", "block", "partial"]
    max_media_size_mb = 10

    capabilities = ChannelCapabilities(
        chat_types=["direct", "group"],
        reactions=True,
        edit=True,
        unsend=True,
        reply=True,
        media=True,
        threads=True,
        typing=False,
        supports_markdown=True,
        supports_streaming=True,
        streaming_modes=["off", "block", "partial"],
        text_chunk_limit=TEXT_CHUNK_LIMIT,
        max_media_size_mb=10,
    )
    meta = ChannelMeta(
        id="dingding",
        label="DingDing",
        aliases=["dingtalk"],
        blurb="钉钉机器人，支持 Stream/Webhook 双模式、流式输出、互动卡片、Emotion 反应等",
        docs_path="/channels/dingding",
        docs_label="钉钉渠道配置",
        selection_docs_prefix="渠道 > 钉钉",
        system_image="dingding.png",
        markdown_capable=True,
        detail_label="钉钉",
        order=60,
    )

    webhook_path = "/api/channels/dingding/events"

    def __init__(self, config: dict[str, Any] | None = None):
        super().__init__(config)
        self._status = ChannelStatus.DISCONNECTED
        self._token_manager: DingDingTokenManager | None = None
        self._stream_client: object = None
        self._stream_task: asyncio.Task | None = None
        self._connected_at: float | None = None
        self._app_key: str = ""
        self._app_secret: str = ""
        self._http_client: httpx.AsyncClient | None = None
        self._send_semaphore = asyncio.Semaphore(DINGDING_RATE_LIMIT_PER_MINUTE)
        self._rate_reset_task: asyncio.Task | None = None
        self._session_webhooks: dict[str, str] = {}
        self._circuit_breaker = CircuitBreaker(failure_threshold=5, recovery_timeout=60, channel_id="dingding")
        self._dedup_guard = DingDingDedupGuard()
        self._policy_matcher = DingDingPolicyMatcher(self.config)
        self._stream_manager = DingDingStreamManager(self)

        self._reconnect_attempts = 0
        self._last_message_at: float | None = None
        self._last_error: str | None = None
        self._busy = False
        self._active_runs = 0

    async def connect(self) -> None:
        if self._status == ChannelStatus.CONNECTED:
            return

        self._status = ChannelStatus.CONNECTING
        logger.info(f"[DingDing] Starting channel '{self.config.get('name', self.channel_id)}'")

        accounts = self.config.get("accounts", {})
        default_account = accounts.get("default", {})
        self._app_key = default_account.get("app_key", "")
        self._app_secret = default_account.get("app_secret", "")

        if not self._app_key or not self._app_secret:
            raise ChannelAuthenticationError()

        http_client = await self._get_http_client()
        self._token_manager = DingDingTokenManager(self._app_key, self._app_secret, http_client=http_client)

        try:
            await self._token_manager.get_token()
        except Exception as e:
            raise ChannelAuthenticationError() from e

        logger.info("[DingDing] Token acquired successfully")

        if self._rate_reset_task is None:
            self._rate_reset_task = asyncio.create_task(self._reset_rate_limit_loop())

        mode = self.config.get("mode", "stream")
        if mode == "stream":
            await self._connect_stream_mode()
        elif mode == "webhook":
            await self._connect_webhook_mode()

        self._status = ChannelStatus.CONNECTED
        self._connected_at = time.time()
        logger.info(f"[DingDing] Channel started, mode: {mode}")

    async def _connect_stream_mode(self) -> None:
        if not HAS_DINGTALK_STREAM:
            logger.warning("[DingDing] dingtalk-stream SDK not installed")
            return

        credential = dingtalk_stream.Credential(
            client_id=self._app_key,
            client_secret=self._app_secret,
        )

        self._stream_client = dingtalk_stream.DingTalkStreamClient(credential)

        from .stream_handler import DingDingCallbackHandler, DingDingChatbotHandler, DingDingEventHandler

        chatbot_handler = DingDingChatbotHandler(self)
        self._stream_client.register_callback_handler(dingtalk_stream.ChatbotMessage.TOPIC, chatbot_handler)

        callback_handler = DingDingCallbackHandler(self)
        self._stream_client.register_callback_handler(dingtalk_stream.CallbackHandler.TOPIC, callback_handler)

        if hasattr(dingtalk_stream, "EventHandler"):
            event_handler = DingDingEventHandler(self)
            event_topic = getattr(dingtalk_stream.EventHandler, "TOPIC", "event")
            self._stream_client.register_callback_handler(event_topic, event_handler)

        self._stream_task = asyncio.create_task(self._run_stream_with_reconnect())
        logger.info("[DingDing] Stream mode task started")

    async def _run_stream_with_reconnect(self) -> None:
        reconnect_delay = STREAM_RECONNECT_DELAY_S
        while self._status in (ChannelStatus.CONNECTED, ChannelStatus.CONNECTING):
            try:
                await self._stream_client.start_forever()
            except asyncio.CancelledError:
                break
            except Exception as e:
                self._reconnect_attempts += 1
                logger.warning(f"[DingDing] Stream disconnected: {e}, reconnecting in {reconnect_delay}s")
                await asyncio.sleep(reconnect_delay)
                reconnect_delay = min(reconnect_delay * 2, STREAM_MAX_RECONNECT_DELAY_S)
            else:
                reconnect_delay = STREAM_RECONNECT_DELAY_S
                self._reconnect_attempts = 0

    async def _connect_webhook_mode(self) -> None:
        logger.info("[DingDing] Webhook mode ready")

    async def disconnect(self) -> None:
        if self._status == ChannelStatus.DISCONNECTED:
            return

        logger.info(f"[DingDing] Stopping channel '{self.config.get('name', self.channel_id)}'")

        if self._rate_reset_task and not self._rate_reset_task.done():
            self._rate_reset_task.cancel()
            try:
                await self._rate_reset_task
            except asyncio.CancelledError:
                pass
            self._rate_reset_task = None

        if self._stream_task and not self._stream_task.done():
            self._stream_task.cancel()
            try:
                await self._stream_task
            except asyncio.CancelledError:
                pass
            self._stream_task = None

        if self._stream_client and hasattr(self._stream_client, "stop"):
            try:
                self._stream_client.stop()
            except Exception:
                pass
            self._stream_client = None

        if self._token_manager:
            self._token_manager.invalidate()
            self._token_manager = None

        self._stream_manager.cleanup()

        if self._http_client and not self._http_client.is_closed:
            await self._http_client.aclose()
            self._http_client = None

        self._session_webhooks.clear()
        self._connected_at = None
        self._status = ChannelStatus.DISCONNECTED

    def normalize_inbound(self, raw: dict[str, Any]) -> ChannelMessage:
        return normalize_inbound(self.channel_id, self.channel_type, raw)

    async def _handle_message(self, message: ChannelMessage) -> None:
        msg_id = message.identity.channel_message_id
        if msg_id and self._dedup_guard.has_processed(msg_id):
            logger.debug(f"[DingDing] Skipping duplicate message: {msg_id}")
            return

        chat_type_str = "group" if message.chat_type.value == "group" else "direct"
        allowed, deny_msg = self._policy_matcher.check_chat_access(message.identity.channel_chat_id, chat_type_str)
        if not allowed:
            logger.info(f"[DingDing] Access denied for {message.identity.channel_chat_id}: {deny_msg}")
            return

        if msg_id:
            self._dedup_guard.record_as_processed(msg_id)

        self._last_message_at = time.time()
        await super()._handle_message(message)

    def format_outbound(self, response: ChannelResponse) -> dict[str, Any]:
        metadata = response.metadata or {}
        chat_type = "group" if response.identity.channel_chat_id.startswith("group_") else "direct"

        return format_outbound(
            response.content,
            chat_type=chat_type,
            metadata={**metadata},
        )

    async def send(self, response: ChannelResponse) -> DeliveryResult:
        if not self._token_manager:
            return DeliveryResult(success=False, error="Not connected")

        payload = self.format_outbound(response)
        chat_id = response.identity.channel_chat_id
        chat_type = "group" if chat_id.startswith("group_") else "direct"

        open_conversation_id = chat_id.replace("group_", "").replace("dm_", "")
        accounts = self.config.get("accounts", {})
        robot_code = accounts.get("default", {}).get("robot_code", "")

        content = response.content
        msg_key = payload.get("msgKey", "sampleText")
        http_client = await self._get_http_client()

        thread_root_id = response.metadata.get("root_id") or response.metadata.get("thread_id")

        at_mobiles = response.metadata.get("at_mobiles") or response.metadata.get("atMobiles")
        at_user_ids = response.metadata.get("at_user_ids") or response.metadata.get("atUserIds")
        is_at_all = response.metadata.get("is_at_all", response.metadata.get("isAtAll", False))

        async def _do_send() -> DeliveryResult:
            async with self._send_semaphore:
                if msg_key == "sampleMarkdown":
                    return await send_markdown(
                        self._token_manager,
                        open_conversation_id,
                        robot_code,
                        "ForcePilot",
                        content,
                        chat_type=chat_type,
                        thread_root_id=thread_root_id,
                        at_mobiles=at_mobiles,
                        at_user_ids=at_user_ids,
                        is_at_all=is_at_all,
                        http_client=http_client,
                    )
                elif msg_key not in ("sampleText",):
                    msg_param_raw = payload.get("msgParam", "{}")
                    msg_param = json.loads(msg_param_raw) if isinstance(msg_param_raw, str) else msg_param_raw
                    return await send_card(
                        self._token_manager,
                        open_conversation_id,
                        robot_code,
                        msg_key,
                        msg_param,
                        chat_type=chat_type,
                        thread_root_id=thread_root_id,
                        http_client=http_client,
                    )
                return await send_text(
                    self._token_manager,
                    open_conversation_id,
                    robot_code,
                    content,
                    chat_type=chat_type,
                    thread_root_id=thread_root_id,
                    at_mobiles=at_mobiles,
                    at_user_ids=at_user_ids,
                    is_at_all=is_at_all,
                    http_client=http_client,
                )

        try:
            result = await self._circuit_breaker.call(_do_send)
            if not result.success and result.error:
                self._last_error = result.error
            return result
        except CircuitBreakerOpenError:
            self._last_error = "Circuit breaker open"
            return DeliveryResult(success=False, error="Circuit breaker open")
        except Exception as e:
            self._last_error = str(e)
            return DeliveryResult(success=False, error=str(e))

    async def send_media(self, chat_id: str, media_type: str, data: Any) -> DeliveryResult:
        if not self._token_manager:
            return DeliveryResult(success=False, error="Not connected")

        accounts = self.config.get("accounts", {})
        robot_code = accounts.get("default", {}).get("robot_code", "")
        open_conversation_id = chat_id.replace("group_", "").replace("dm_", "")
        chat_type = "group" if chat_id.startswith("group_") else "direct"
        http_client = await self._get_http_client()

        async with self._send_semaphore:
            try:
                filename = f"media_{int(time.time())}"
                upload_resp = await upload_media(
                    self._token_manager, media_type, data, filename=filename, http_client=http_client
                )
                media_id = upload_resp.get("media_id", upload_resp.get("mediaId", ""))
                if not media_id:
                    return DeliveryResult(success=False, error="Failed to get media_id from upload")
                return await _send_media(
                    self._token_manager,
                    open_conversation_id,
                    robot_code,
                    media_id,
                    media_type,
                    chat_type=chat_type,
                    http_client=http_client,
                )
            except Exception as e:
                logger.error(f"[DingDing] send_media failed: {e}")
                return DeliveryResult(success=False, error=str(e))

    async def send_stream_chunk(self, chat_id: str, msg_id: str, chunk: str, finished: bool) -> DeliveryResult:
        if not self._token_manager:
            return DeliveryResult(success=False, error="Not connected")

        return await self._stream_manager.send_chunk(chat_id, msg_id, chunk, finished)

    @property
    def block_streaming(self) -> bool:
        return True

    async def send_typing_indicator(self, chat_id: str, active: bool) -> DeliveryResult:
        return DeliveryResult(success=True)

    async def edit_message(self, chat_id: str, msg_id: str, content: str) -> DeliveryResult:
        if not self._token_manager:
            return DeliveryResult(success=False, error="Not connected")

        try:
            token = await self._token_manager.get_token()
            http_client = await self._get_http_client()
            url = f"https://api.dingtalk.com/v1.0/robot/messages/{msg_id}"

            headers = {
                "x-acs-dingtalk-access-token": token,
                "Content-Type": "application/json",
            }

            accounts = self.config.get("accounts", {})
            default_account = accounts.get("default", {})

            payload = {
                "msgParam": json.dumps({"content": content}, ensure_ascii=False),
                "msgKey": "sampleMarkdown",
                "openConversationId": chat_id.replace("group_", "").replace("dm_", ""),
                "robotCode": default_account.get("robot_code", ""),
            }

            resp = await http_client.put(url, json=payload, headers=headers)
            if resp.status_code != 200:
                return DeliveryResult(success=False, error=f"DingDing API HTTP {resp.status_code}")

            data = resp.json()
            return DeliveryResult(success=True, message_id=data.get("processQueryKey", msg_id))
        except Exception as e:
            logger.error(f"[DingDing] edit_message failed: {e}")
            return DeliveryResult(success=False, error=str(e))

    async def delete_message(self, chat_id: str, msg_id: str) -> DeliveryResult:
        if not self._token_manager:
            return DeliveryResult(success=False, error="Not connected")

        try:
            token = await self._token_manager.get_token()
            http_client = await self._get_http_client()

            accounts = self.config.get("accounts", {})
            robot_code = accounts.get("default", {}).get("robot_code", "")
            open_conversation_id = chat_id.replace("group_", "").replace("dm_", "")

            url = "https://api.dingtalk.com/v1.0/robot/groupMessages/recall"

            headers = {
                "x-acs-dingtalk-access-token": token,
                "Content-Type": "application/json",
            }
            payload = {
                "openConversationId": open_conversation_id,
                "robotCode": robot_code,
                "processQueryKeys": [msg_id],
            }

            resp = await http_client.post(url, json=payload, headers=headers)
            if resp.status_code != 200:
                return DeliveryResult(success=False, error=f"DingDing API HTTP {resp.status_code}: {resp.text[:200]}")

            return DeliveryResult(success=True)
        except Exception as e:
            logger.error(f"[DingDing] delete_message failed: {e}")
            return DeliveryResult(success=False, error=str(e))

    async def send_reaction(self, chat_id: str, msg_id: str, emoji: str) -> DeliveryResult:
        if not self._token_manager:
            return DeliveryResult(success=False, error="Not connected")

        from .reactions import send_reaction as _send_react

        accounts = self.config.get("accounts", {})
        robot_code = accounts.get("default", {}).get("robot_code", "")
        open_conversation_id = chat_id.replace("group_", "").replace("dm_", "")
        http_client = await self._get_http_client()

        return await _send_react(
            self._token_manager,
            open_conversation_id,
            robot_code,
            msg_id,
            emoji,
            http_client=http_client,
        )

    async def remove_reaction(self, chat_id: str, msg_id: str, emoji: str) -> DeliveryResult:
        if not self._token_manager:
            return DeliveryResult(success=False, error="Not connected")

        from .reactions import remove_reaction as _remove_react

        accounts = self.config.get("accounts", {})
        robot_code = accounts.get("default", {}).get("robot_code", "")
        open_conversation_id = chat_id.replace("group_", "").replace("dm_", "")
        http_client = await self._get_http_client()

        return await _remove_react(
            self._token_manager,
            open_conversation_id,
            robot_code,
            msg_id,
            emoji,
            http_client=http_client,
        )

    async def list_reactions(self, chat_id: str, msg_id: str) -> dict[str, Any]:
        if not self._token_manager:
            return {"reactions": [], "total": 0}

        from .reactions import list_reactions as _list_react

        accounts = self.config.get("accounts", {})
        robot_code = accounts.get("default", {}).get("robot_code", "")
        open_conversation_id = chat_id.replace("group_", "").replace("dm_", "")
        http_client = await self._get_http_client()

        return await _list_react(
            self._token_manager,
            open_conversation_id,
            robot_code,
            msg_id,
            http_client=http_client,
        )

    async def download_media(self, file_id: str) -> bytes:
        if not self._token_manager:
            raise RuntimeError("Not connected")

        http_client = await self._get_http_client()
        return await _download_media(self._token_manager, file_id, http_client=http_client)

    async def health_check(self) -> HealthStatus:
        if not self._token_manager:
            return HealthStatus(status="unhealthy", last_error="Not connected")

        try:
            token = await self._token_manager.get_token()
            return HealthStatus(
                status="healthy" if token else "degraded",
                metadata={
                    "mode": self.config.get("mode", "stream"),
                    "adapter_status": self._status.value,
                },
                last_connected_at=utc_now_naive() if token else None,
            )
        except Exception as e:
            return HealthStatus(status="unhealthy", last_error=str(e))

    async def verify_webhook_signature(self, headers: dict, body: bytes) -> bool:
        accounts = self.config.get("accounts", {})
        app_secret = accounts.get("default", {}).get("app_secret", "")
        if not app_secret:
            logger.error("[DingDing] Webhook signature verification failed: no app_secret configured")
            return False
        return verify_sign(headers, app_secret)

    async def get_user_info(self, channel_user_id: str) -> dict[str, Any]:
        if not self._token_manager:
            return {}
        try:
            token = await self._token_manager.get_token()
            http_client = await self._get_http_client()
            resp = await http_client.get(
                f"https://api.dingtalk.com/v1.0/contact/users/{channel_user_id}",
                headers={"x-acs-dingtalk-access-token": token},
            )
            if resp.status_code == 200:
                data = resp.json()
                return {
                    "user_id": data.get("openId", data.get("unionId", channel_user_id)),
                    "name": data.get("nick", data.get("name", "")),
                    "avatar_url": data.get("avatarUrl", data.get("avatar", "")),
                    "email": data.get("email", ""),
                    "mobile": data.get("mobile", ""),
                    "raw": data,
                }
        except Exception:
            logger.warning(f"[DingDing] Failed to get user info for {channel_user_id}", exc_info=True)
        return {}

    async def receive(self) -> AsyncIterator[ChannelMessage]:
        if False:
            yield

    async def _refresh_token_if_needed(self) -> bool:
        if not self._token_manager:
            return False
        try:
            await self._token_manager.get_token()
            return True
        except Exception:
            return False

    async def _get_http_client(self) -> httpx.AsyncClient:
        if self._http_client is None or self._http_client.is_closed:
            self._http_client = httpx.AsyncClient(
                timeout=httpx.Timeout(15),
                limits=httpx.Limits(max_keepalive_connections=5, max_connections=20),
            )
        return self._http_client

    async def _reset_rate_limit_loop(self) -> None:
        while True:
            await asyncio.sleep(60)
            old_sem, self._send_semaphore = self._send_semaphore, asyncio.Semaphore(DINGDING_RATE_LIMIT_PER_MINUTE)
            for _ in range(DINGDING_RATE_LIMIT_PER_MINUTE):
                try:
                    old_sem.release()
                except ValueError:
                    break

    def build_snapshot(self) -> ChannelAccountSnapshot:
        from yuxi.channels.models import build_snapshot_from_adapter

        snapshot = build_snapshot_from_adapter(self)

        snapshot.running = self._status == ChannelStatus.CONNECTED
        snapshot.connected = self._status == ChannelStatus.CONNECTED
        snapshot.status_state = str(self._status.value)

        accounts = self.config.get("accounts", {})
        default_account = accounts.get("default", {})
        snapshot.account_id = default_account.get("robot_code", "")
        snapshot.name = self.config.get("name", "DingDing")
        snapshot.configured = bool(self._app_key and self._app_secret)

        if self._token_manager:
            try:
                token_valid = time.time() < getattr(self._token_manager, "_token_expires_at", 0)
                snapshot.token_status = TokenStatus(status="valid" if token_valid else "expired")
            except Exception:
                pass

        snapshot.reconnect_attempts = self._reconnect_attempts
        snapshot.last_error = self._last_error
        snapshot.last_message_at = self._last_message_at
        snapshot.last_connected_at_s = self._connected_at
        snapshot.busy = self._busy
        snapshot.active_runs = self._active_runs

        snapshot.dm_policy = self.config.get("dm_policy", self.config.get("dmPolicy", "pairing"))
        snapshot.group_policy = self.config.get("group_policy", self.config.get("groupPolicy", "allowlist"))
        allowlist = self.config.get("allowFrom", self.config.get("allowlist", []))
        snapshot.allow_from_count = len(allowlist) if isinstance(allowlist, (list, set)) else 0
        snapshot.webhook_path = str(self.webhook_path)

        snapshot.bot = {
            "channel": "dingding",
            "mode": self.config.get("mode", "stream"),
            "robot_code": default_account.get("robot_code", ""),
            "stream_mode": self.config.get("streaming", {}).get("mode", "block"),
            "chat_types": ["direct", "group"],
            "capabilities": {
                "reactions": True,
                "edit": True,
                "unsend": True,
                "reply": True,
                "media": True,
                "streaming": True,
            },
        }

        dedup_stats = self._dedup_guard.stats()
        snapshot.audit = {
            "dedup_committed": dedup_stats.get("committed", 0),
            "dedup_pending": dedup_stats.get("pending", 0),
            "stream_sessions": len(getattr(self._stream_manager, "_sessions", {})),
            "rate_limit": DINGDING_RATE_LIMIT_PER_MINUTE,
        }

        return snapshot