import logging
import json

from api_v1.utils.wecom_webhook import send_wecom_webhook_message
from notifier.jpush import send_jpush_payload
from notifier.models import NotifierChannelEnum
from notifier.message_api import send_message_api_news_to_agents, send_message_api_text_message
from notifier.serializers import (
    MessageNewsRequestSerializer,
    MessageTemplatePayloadSerializer,
    MessageTextRequestSerializer,
)

logger = logging.getLogger(__name__)


class BaseNotifierBackend:
    channel = ""

    def notify(self, *, notifier, content: str, context: dict) -> dict:
        raise NotImplementedError


class WeComWebhookNotifierBackend(BaseNotifierBackend):
    channel = NotifierChannelEnum.WECOM_WEBHOOK

    def notify(self, *, notifier, content: str, context: dict) -> dict:
        content = (content or "").strip()
        if not content:
            raise ValueError("企业微信机器人消息 content 不能为空")
        msgtype = str(notifier.get_config_value("msgtype", "markdown") or "markdown").strip().lower()
        timeout_seconds = float(notifier.get_config_value("timeout_seconds", 10.0) or 10.0)
        key = str(notifier.get_config_value("key", "") or "").strip()
        response = send_wecom_webhook_message(
            content=content,
            msgtype=msgtype,
            key=key or None,
            timeout_seconds=timeout_seconds,
        )
        if not response.ok:
            raise RuntimeError(f"WeCom webhook 返回失败: errcode={response.errcode}, errmsg={response.errmsg}")
        result = {
            "channel": self.channel,
            "msgtype": msgtype,
            "errcode": response.errcode,
            "errmsg": response.errmsg,
        }
        logger.info("[notifier.backends] wecom webhook sent: notifier_id=%s result=%s", notifier.id, result)
        return result


class MessageAPINotifierBackend(BaseNotifierBackend):
    channel = NotifierChannelEnum.MESSAGE_API

    def _load_rendered_payload(self, *, content: str) -> dict:
        content = (content or "").strip()
        if not content:
            raise ValueError("消息发送 API 模板渲染结果不能为空")
        try:
            payload = json.loads(content)
        except json.JSONDecodeError as exc:
            raise ValueError(f"消息发送 API 模板渲染结果不是合法 JSON: {exc}") from exc
        if not isinstance(payload, dict):
            raise ValueError("消息发送 API 模板渲染结果必须是 JSON 对象")

        serializer = MessageTemplatePayloadSerializer(data=payload)
        serializer.is_valid(raise_exception=True)
        return serializer.validated_data

    def notify(self, *, notifier, content: str, context: dict) -> dict:
        rendered_payload = self._load_rendered_payload(content=content)
        msgtype = rendered_payload["msgtype"]

        if msgtype == "text":
            payload = {
                "agent_id": rendered_payload.get("agent_id", notifier.get_config_value("agent_id")),
                "content": rendered_payload["content"],
            }
            resolved_user_ids = rendered_payload.get("user_ids") or notifier.get_config_value("user_ids")
            if resolved_user_ids:
                payload["user_ids"] = resolved_user_ids
            serializer = MessageTextRequestSerializer(data=payload)
            serializer.is_valid(raise_exception=True)
            data = serializer.validated_data
            response = send_message_api_text_message(
                agent_id=data["agent_id"],
                content=data["content"],
                user_ids=data.get("user_ids"),
                timeout_seconds=float(notifier.get_config_value("timeout_seconds", 10.0) or 10.0),
            )
            result = {
                "channel": self.channel,
                "msgtype": "text",
                "agent_id": data["agent_id"],
                "errcode": response.errcode,
                "errmsg": response.errmsg,
            }
            logger.info("[notifier.backends] message api text sent: notifier_id=%s result=%s", notifier.id, result)
            return result

        payload = {
            "agent_ids": rendered_payload.get("agent_ids", notifier.get_config_value("agent_ids")),
            "title": rendered_payload["title"],
            "description": rendered_payload["description"],
            "url": rendered_payload["url"],
            "image_url": rendered_payload["image_url"],
        }
        resolved_user_ids = rendered_payload.get("user_ids") or notifier.get_config_value("user_ids")
        if resolved_user_ids:
            payload["user_ids"] = resolved_user_ids
        serializer = MessageNewsRequestSerializer(data=payload)
        serializer.is_valid(raise_exception=True)
        data = serializer.validated_data
        results = send_message_api_news_to_agents(
            agent_ids=data["agent_ids"],
            title=data["title"],
            description=data["description"],
            url=data["url"],
            image_url=data["image_url"],
            user_ids=data.get("user_ids"),
            timeout_seconds=float(notifier.get_config_value("timeout_seconds", 10.0) or 10.0),
        )
        if not any(item.get("ok") for item in results):
            raise RuntimeError("All agent sends failed")

        result = {
            "channel": self.channel,
            "msgtype": "news",
            "agent_ids": data["agent_ids"],
            "ok_count": sum(1 for item in results if item.get("ok")),
            "total_count": len(results),
            "results": results,
        }
        logger.info("[notifier.backends] message api news sent: notifier_id=%s result=%s", notifier.id, result)
        return result


class JPushNotifierBackend(BaseNotifierBackend):
    channel = NotifierChannelEnum.JPUSH

    def _load_rendered_payload(self, *, content: str) -> dict:
        content = (content or "").strip()
        if not content:
            raise ValueError("极光推送模板渲染结果不能为空")
        try:
            payload = json.loads(content)
        except json.JSONDecodeError as exc:
            raise ValueError(f"极光推送模板渲染结果不是合法 JSON: {exc}") from exc
        if not isinstance(payload, dict):
            raise ValueError("极光推送模板渲染结果必须是 JSON 对象")
        return payload

    def _resolve_aliases(self, *, notifier, rendered_payload: dict, context: dict) -> list[str]:
        aliases = rendered_payload.get("aliases") or notifier.get_config_value("aliases")
        if aliases:
            return self._normalize_aliases(aliases)

        recipient_source = str(
            rendered_payload.get("recipient_source")
            or notifier.get_config_value("recipient_source", "participants")
            or "participants"
        )
        employee_ids = []
        if recipient_source == "participants":
            employee_ids = context.get("participant_ids") or []
        elif recipient_source == "creator":
            employee_ids = [context.get("creator_id")]
        elif recipient_source == "participants_and_creator":
            employee_ids = [*(context.get("participant_ids") or []), context.get("creator_id")]
        else:
            raise ValueError(f"不支持的极光接收人来源: {recipient_source}")

        alias_prefix = str(notifier.get_config_value("alias_prefix", "emp_") or "emp_")
        resolved = []
        for employee_id in employee_ids:
            if employee_id is None or employee_id == "":
                continue
            resolved.append(f"{alias_prefix}{int(employee_id)}")
        return self._normalize_aliases(resolved)

    def _normalize_aliases(self, values) -> list[str]:
        aliases = []
        for value in values or []:
            alias = str(value or "").strip()
            if not alias:
                raise ValueError("极光 aliases 中不能包含空值")
            if len(alias.encode("utf-8")) > 40:
                raise ValueError(f"极光 alias 超过 40 字节限制: {alias}")
            aliases.append(alias)
        aliases = list(dict.fromkeys(aliases))
        if not aliases:
            raise ValueError("极光推送接收 alias 不能为空")
        if len(aliases) > 1000:
            raise ValueError("极光单次推送 alias 不能超过 1000 个")
        return aliases

    def _build_payload(self, *, notifier, rendered_payload: dict, context: dict) -> dict:
        aliases = self._resolve_aliases(
            notifier=notifier,
            rendered_payload=rendered_payload,
            context=context,
        )
        platform = rendered_payload.get("platform") or notifier.get_config_value("platform", "all")
        title = str(rendered_payload.get("title") or notifier.get_config_value("title", "任务提醒")).strip()
        alert = str(rendered_payload.get("alert") or rendered_payload.get("content") or "").strip()
        if not alert:
            raise ValueError("极光推送 alert 不能为空")

        extras = rendered_payload.get("extras") or {}
        if not isinstance(extras, dict):
            raise ValueError("极光推送 extras 必须是 JSON 对象")

        notification = {
            "alert": alert,
            "android": {
                "alert": alert,
                "title": title,
                "extras": extras,
            },
            "ios": {
                "alert": alert,
                "sound": rendered_payload.get("ios_sound") or notifier.get_config_value("ios_sound", "default"),
                "extras": extras,
            },
        }
        android_channel_id = rendered_payload.get("android_channel_id") or notifier.get_config_value("android_channel_id")
        if android_channel_id:
            notification["android"]["channel_id"] = str(android_channel_id)
        android_intent = rendered_payload.get("android_intent") or notifier.get_config_value("android_intent")
        if android_intent:
            notification["android"]["intent"] = {"url": str(android_intent)}
        android_category = rendered_payload.get("android_category") or notifier.get_config_value("android_category")
        if android_category:
            notification["android"]["category"] = str(android_category)

        payload = {
            "platform": platform,
            "audience": {"alias": aliases},
            "notification": notification,
            "options": {
                "apns_production": bool(notifier.get_config_value("apns_production", False)),
            },
        }
        time_to_live = rendered_payload.get("time_to_live", notifier.get_config_value("time_to_live"))
        if time_to_live is not None:
            payload["options"]["time_to_live"] = int(time_to_live)

        message = rendered_payload.get("message")
        if message:
            if not isinstance(message, dict):
                raise ValueError("极光推送 message 必须是 JSON 对象")
            payload["message"] = message
        return payload

    def notify(self, *, notifier, content: str, context: dict) -> dict:
        rendered_payload = self._load_rendered_payload(content=content)
        payload = self._build_payload(
            notifier=notifier,
            rendered_payload=rendered_payload,
            context=context,
        )
        response = send_jpush_payload(
            app_key=notifier.get_config_value("app_key"),
            master_secret=notifier.get_config_value("master_secret"),
            payload=payload,
            timeout_seconds=float(notifier.get_config_value("timeout_seconds", 10.0) or 10.0),
        )
        result = {
            "channel": self.channel,
            "aliases": payload["audience"]["alias"],
            "msg_id": response.raw.get("msg_id"),
            "sendno": response.raw.get("sendno"),
            "raw": response.raw,
        }
        logger.info("[notifier.backends] jpush sent: notifier_id=%s result=%s", notifier.id, result)
        return result