"""NoneBot OneBot V11 适配器：负责拉取群历史消息、群组/成员信息与发送。"""

from __future__ import annotations

import asyncio
from datetime import datetime, timedelta
from typing import Any

from . import history_store
from .core.domain.value_objects.unified_group import UnifiedGroup, UnifiedMember
from .core.domain.value_objects.unified_message import (
    MessageContent,
    MessageContentType,
    UnifiedMessage,
)
from .core.utils.logger import logger

# 分页锚点字段链（后端差异实测）：NapCat 的 message_seq 参数按 OB11
# message_id(shortId 短 ID 映射) 解析,传消息内的 message_seq(内核 msgSeq)
# 命中不了映射 → NapCat 抛"消息不存在",翻页断裂;go-cqhttp/LLOneBot 等
# 则识别 message_seq。优先 message_id,翻页无进度时依次回退。
ANCHOR_FIELDS = ("message_id", "message_seq", "seq", "real_id")


def _fmt_ts(ts: int) -> str:
    """时间戳转日志用的可读时间。"""
    try:
        return datetime.fromtimestamp(ts).strftime("%Y-%m-%d %H:%M")
    except (OSError, OverflowError, ValueError):
        return str(ts)


def _pick_anchor(raw: dict[str, Any], fields: tuple[str, ...], start: int):
    """从消息中按字段优先级提取分页锚点值"""
    for field in fields[start:]:
        val = raw.get(field)
        if val is not None:
            return val
    return None


class OneBotAdapter:
    """面向 NoneBot OneBot V11 的最小适配器。"""

    platform_name = "onebot"

    USER_AVATAR_TEMPLATE = "https://q1.qlogo.cn/g?b=qq&nk={user_id}&s=640"

    def __init__(self, bot: Any, config: dict | None = None):
        self.bot = bot
        self.config = config or {}
        self.platform_id = str(self.config.get("platform_id") or "onebot")
        self.bot_self_ids = [str(x) for x in self.config.get("bot_self_ids", [])]
        self.filter_bot_messages = bool(self.config.get("filter_bot_messages", True))
        # 优先读本地消息库（learning_chat 落库），取不到再回退接口分页
        self.use_local_history = bool(self.config.get("use_local_history", True))

    # —— 消息拉取 ——
    async def fetch_messages(
        self,
        group_id: str,
        days: int = 1,
        max_count: int = 1000,
        before_id: str | None = None,
        since_ts: int | None = None,
    ) -> list[UnifiedMessage]:
        try:
            chunk_size = 100
            all_raw = []
            seen_raw_ids: set[str] = set()

            if since_ts and since_ts > 0:
                start_ts = since_ts
            else:
                start_ts = int(
                    (datetime.now() - timedelta(days=days)).timestamp()
                )
            end_ts = int(datetime.now().timestamp())

            # 本地消息库优先（完整且毫秒级）；before_id 无法映射到时间戳，故跳过
            if self.use_local_history and not before_id:
                local = await self._fetch_from_local_store(
                    group_id, start_ts, end_ts, max_count
                )
                if local:
                    return local

            current_anchor = before_id
            anchor_idx = 0
            no_progress_pages = 0
            last_earliest: dict[str, Any] | None = None

            while len(all_raw) < max_count:
                fetch_count = min(chunk_size, max_count - len(all_raw))
                params: dict[str, Any] = {
                    "group_id": int(group_id),
                    "count": fetch_count,
                }
                if current_anchor:
                    params["message_seq"] = current_anchor
                params["reverseOrder"] = True

                result = None
                for attempt in range(1, 4):
                    try:
                        result = await self.bot.call_api(
                            "get_group_msg_history", **params
                        )
                        break
                    except Exception as exc:
                        if attempt < 3:
                            logger.warning(
                                f"OneBot 分页拉取失败(第{attempt}次): {exc}"
                            )
                            await asyncio.sleep(attempt)
                        else:
                            logger.warning(
                                f"OneBot 分页拉取重试耗尽: {exc}"
                            )
                if not result or "messages" not in result:
                    break
                messages = result.get("messages", [])
                if not messages:
                    # 空页可能意味着当前锚点字段不被后端识别(如 NapCat 外的
                    # 实现收到 message_id),换下一字段重试一次,仍空则结束。
                    if current_anchor is None or last_earliest is None:
                        break
                    if no_progress_pages >= 1 or anchor_idx >= len(ANCHOR_FIELDS) - 1:
                        logger.warning(
                            "OneBot 分页拉取: 返回空页且锚点字段已耗尽,停止回溯"
                        )
                        break
                    no_progress_pages += 1
                    anchor_idx += 1
                    current_anchor = _pick_anchor(
                        last_earliest, ANCHOR_FIELDS, anchor_idx
                    )
                    if current_anchor is None:
                        break
                    logger.warning(
                        f"OneBot 分页拉取: 空页,锚点字段切换为 {ANCHOR_FIELDS[anchor_idx]}"
                    )
                    continue

                first = messages[0]
                last = messages[-1]
                earliest = first if first.get("time", 0) <= last.get("time", 0) else last
                last_earliest = earliest
                chunk_earliest_ts = earliest.get("time", 0)

                prev_len = len(all_raw)
                for raw in messages:
                    msg_time = raw.get("time", 0)
                    msg_id = str(raw.get("message_id", ""))
                    if not msg_id or msg_id in seen_raw_ids:
                        continue
                    if start_ts <= msg_time <= int(datetime.now().timestamp()):
                        all_raw.append(raw)
                        seen_raw_ids.add(msg_id)
                added = len(all_raw) - prev_len

                if chunk_earliest_ts <= start_ts:
                    logger.info(
                        f"OneBot 分页拉取: 已到达起始时间,共 {len(all_raw)} 条"
                    )
                    break

                if added == 0:
                    # 本页没有新增消息:锚点不生效(后端不支持该字段)或数据已取尽。
                    # 先切换锚点字段再试一次,仍无新增则结束。
                    no_progress_pages += 1
                    if no_progress_pages >= 2:
                        logger.warning(
                            "OneBot 分页拉取: 连续 2 页无新增,停止回溯"
                        )
                        break
                    if anchor_idx < len(ANCHOR_FIELDS) - 1:
                        anchor_idx += 1
                        logger.warning(
                            f"OneBot 分页拉取: 锚点字段切换为 {ANCHOR_FIELDS[anchor_idx]}"
                        )
                else:
                    no_progress_pages = 0

                new_anchor = _pick_anchor(earliest, ANCHOR_FIELDS, anchor_idx)
                if new_anchor is None:
                    break
                if current_anchor and str(new_anchor) == str(current_anchor):
                    logger.info("OneBot 分页拉取: 锚点未位移,历史已取尽")
                    break
                current_anchor = new_anchor
                logger.info(
                    f"OneBot 分页拉取进度: {len(all_raw)} 条,"
                    f"锚点({ANCHOR_FIELDS[anchor_idx]}): {new_anchor}"
                )
                await asyncio.sleep(0.05)

            unified: list[UnifiedMessage] = []
            seen: set[str] = set()
            for raw in all_raw:
                mid = str(raw.get("message_id", ""))
                if not mid or mid in seen:
                    continue
                u = self._convert_message(raw, group_id)
                if u:
                    unified.append(u)
                    seen.add(mid)
            unified.sort(key=lambda m: m.timestamp)
            return unified
        except Exception as e:
            logger.warning(f"OneBot 分页获取消息失败: {e}")
            return []

    async def _fetch_from_local_store(
        self, group_id: str, start_ts: int, end_ts: int, max_count: int
    ) -> list[UnifiedMessage]:
        """从本地消息库（learning_chat 落库）取群历史；不可用时返回空以回退分页。"""
        try:
            result = await asyncio.to_thread(
                history_store.fetch_group_messages,
                group_id,
                start_ts,
                end_ts,
                max_count,
            )
        except Exception as e:
            logger.warning(f"本地历史读取失败，回退接口分页: {e}")
            return []

        if not result:
            logger.info(
                f"本地历史无数据({result.error or '窗口内无消息'})，"
                "回退 OneBot 分页拉取"
            )
            return []

        logger.info(
            f"本地历史记录拉取: group={group_id}, source={history_store.MESSAGE_TABLE}, "
            f"count={len(result.messages)}, "
            f"窗口=[{_fmt_ts(start_ts)}..{_fmt_ts(end_ts)}], "
            f"名称覆盖={result.names_resolved}/{len(result.messages)}, "
            f"去重={result.duplicates}"
        )
        if result.truncated:
            window_total = (
                result.window_total if result.window_total is not None else "?"
            )
            earliest = result.messages[0]["time"] if result.messages else end_ts
            logger.warning(
                f"本地历史截断: group={group_id}, max_messages={max_count}, "
                f"窗口内共 {window_total} 条, 实际取最近 {len(result.messages)} 条, "
                f"最早={_fmt_ts(earliest)}, 窗口起点={_fmt_ts(start_ts)}"
            )

        unified: list[UnifiedMessage] = []
        for raw in result.messages:
            converted = self._convert_message(raw, group_id)
            if converted:
                unified.append(converted)
        return unified

    def _convert_message(self, raw: dict, group_id: str) -> UnifiedMessage | None:
        try:
            sender = raw.get("sender", {})
            chain = raw.get("message", [])
            if isinstance(chain, str):
                chain = [{"type": "text", "data": {"text": chain}}]
            contents: list[MessageContent] = []
            text_parts: list[str] = []
            for seg in chain:
                seg_t = seg.get("type", "")
                seg_d = seg.get("data", {})
                if seg_t == "text":
                    text = seg_d.get("text", "")
                    text_parts.append(text)
                    contents.append(MessageContent(type=MessageContentType.TEXT, text=text))
                elif seg_t == "image":
                    sub_type = seg_d.get("subType", seg_d.get("sub_type"))
                    try:
                        is_sticker = int(sub_type) == 1
                    except (TypeError, ValueError):
                        is_sticker = False
                    raw_data: dict[str, Any] = {"summary": seg_d.get("summary", "")}
                    if sub_type is not None:
                        try:
                            raw_data["sub_type"] = int(sub_type)
                        except (TypeError, ValueError):
                            pass
                    contents.append(
                        MessageContent(
                            type=MessageContentType.EMOJI if is_sticker else MessageContentType.IMAGE,
                            url=seg_d.get("url", seg_d.get("file", "")),
                            raw_data=raw_data,
                        )
                    )
                elif seg_t == "at":
                    contents.append(
                        MessageContent(type=MessageContentType.AT, at_user_id=str(seg_d.get("qq", "")))
                    )
                elif seg_t in ("face", "mface", "bface", "sface"):
                    contents.append(
                        MessageContent(
                            type=MessageContentType.EMOJI,
                            emoji_id=str(seg_d.get("id", "")),
                            raw_data={"face_type": seg_t},
                        )
                    )
                elif seg_t == "reply":
                    contents.append(
                        MessageContent(type=MessageContentType.REPLY, raw_data={"reply_id": seg_d.get("id", "")})
                    )
                else:
                    contents.append(MessageContent(type=MessageContentType.UNKNOWN, raw_data=seg))

            reply_to = None
            for c in contents:
                if c.type == MessageContentType.REPLY and c.raw_data:
                    reply_to = str(c.raw_data.get("reply_id", ""))
                    break

            return UnifiedMessage(
                message_id=str(raw.get("message_id", "")),
                sender_id=str(sender.get("user_id", "")),
                sender_name=sender.get("nickname", ""),
                sender_card=sender.get("card", "") or None,
                group_id=group_id,
                text_content="".join(text_parts),
                contents=tuple(contents),
                timestamp=raw.get("time", 0),
                platform="onebot",
                reply_to_id=reply_to,
            )
        except Exception as e:
            logger.debug(f"OneBot _convert_message error: {e}")
            return None

    # —— 群/成员信息 ——
    async def get_group_info(self, group_id: str) -> UnifiedGroup | None:
        try:
            gid = int(group_id)
            data = await self.bot.call_api("get_group_info", group_id=gid)
            if isinstance(data, list):
                data = next((d for d in data if str(d.get("group_id")) == str(gid)), data[0] if data else {})
            return UnifiedGroup(
                group_id=str(gid),
                group_name=data.get("group_name", ""),
                member_count=int(data.get("member_count", 0) or 0),
                platform="onebot",
            )
        except Exception as e:
            logger.debug(f"get_group_info({group_id}) 失败: {e}")
            return None

    async def get_user_avatar_url(self, user_id: str) -> str | None:
        return self.USER_AVATAR_TEMPLATE.format(user_id=user_id)

    async def get_member_info(self, group_id: str, user_id: str) -> UnifiedMember | None:
        try:
            data = await self.bot.call_api(
                "get_group_member_info",
                group_id=int(group_id),
                user_id=int(user_id),
            )
            return UnifiedMember(
                user_id=str(user_id),
                nickname=data.get("nickname", ""),
                card=data.get("card", "") or None,
                role=str(data.get("role", "member")),
            )
        except Exception as e:
            logger.debug(f"get_member_info({group_id},{user_id}) 失败: {e}")
            return None

    async def is_group_muted(self, group_id: str) -> bool:
        return False

    def get_platform_name(self) -> str:
        return self.platform_name

    # —— 发送（在手动/自动报告中可用；手动指令会走 SAA 发送） ——
    async def send_text(self, group_id: str, text: str) -> bool:
        try:
            await self.bot.call_api("send_group_msg", group_id=int(group_id), message=str(text))
            return True
        except Exception as e:
            logger.warning(f"send_text 失败: {e}")
            return False

    async def send_image(self, group_id: str, image_url: str, caption: str = "") -> bool:
        try:
            if image_url.startswith("base64://"):
                b64 = image_url.split("base64://", 1)[1]
                from nonebot.adapters.onebot.v11 import MessageSegment
                msg = MessageSegment.image(file=f"base64://{b64}")
            else:
                from nonebot.adapters.onebot.v11 import MessageSegment
                msg = MessageSegment.image(file=image_url)
            await self.bot.call_api("send_group_msg", group_id=int(group_id), message=msg)
            return True
        except Exception as e:
            logger.warning(f"send_image 失败: {e}")
            return False

    async def send_file(self, group_id: str, file_path: str, caption: str = "") -> bool:
        return False

    async def send_forward_msg(self, group_id: str, nodes: list[dict]) -> bool:
        """发送 OneBot v11 合并转发消息 (send_forward_msg)。"""
        try:
            from nonebot.adapters.onebot.v11 import MessageSegment

            normalized = []
            for n in nodes:
                data = dict(n.get("data", {}))
                content = data.get("content")
                if isinstance(content, str):
                    content = [MessageSegment.text(content)]
                elif content is None:
                    content = []
                data["content"] = content
                normalized.append({"type": "node", "data": data})

            await self.bot.call_api(
                "send_forward_msg", group_id=int(group_id), messages=normalized
            )
            return True
        except Exception as e:
            logger.warning(f"send_forward_msg 失败: {e}")
            return False

    async def set_reaction(self, group_id: str, message_id: str, emoji: str | int, is_add: bool = True) -> bool:
        return False

    async def prepare_group_member_cache(self, group_id: str):
        return True, None