"""命令监听处理器：匹配 #命令名+空格 格式的消息，转发到外部回调 URL 并自动回复。"""

import re

import aiohttp

from ..config import COMMAND_CALLBACK_URL, COMMAND_LENGTH, COMMAND_PREFIX


def build_command_pattern() -> re.Pattern:
    """构建命令匹配正则：# + N个中文字 + 空格。"""
    return re.compile(
        rf"^{re.escape(COMMAND_PREFIX)}([\u4e00-\u9fff]{{{COMMAND_LENGTH}}})\s+(.+)",
        re.DOTALL,
    )


COMMAND_PATTERN = build_command_pattern()


def parse_command(raw_message: str) -> dict | None:
    """解析消息，匹配命令模式。返回 {command, content, raw_message} 或 None。"""
    match = COMMAND_PATTERN.match(raw_message.strip())
    if not match:
        return None
    return {
        "command": match.group(1),
        "content": match.group(2).strip(),
        "raw_message": raw_message.strip(),
    }


async def send_command_callback(data: dict, event, api, logger) -> None:
    """将命令数据 POST 到外部回调 URL，根据响应自动回复到 QQ。

    回调服务器返回格式：
    {
        "reply": "回复文本",                    // 纯文本回复
        "messages": [                          // 批量回复（可选，优先于 reply）
            {"type": "text", "msg": "..."},
            {"type": "image", "url": "..."},
            {"type": "file", "url": "..."},
            {"type": "video", "url": "..."}
        ]
    }

    所有字段均为可选，无回复内容时返回空 JSON 即可。
    """
    if not COMMAND_CALLBACK_URL:
        logger.warning("COMMAND_CALLBACK_URL 未配置，跳过命令回调")
        return

    try:
        async with aiohttp.ClientSession() as session:
            async with session.post(
                COMMAND_CALLBACK_URL,
                json=data,
                timeout=aiohttp.ClientTimeout(total=10),
            ) as resp:
                if resp.status >= 400:
                    body = await resp.text()
                    logger.error(
                        "命令回调失败: status=%d url=%s body=%s",
                        resp.status, COMMAND_CALLBACK_URL, body[:200],
                    )
                    return

                # 解析响应，自动回复
                try:
                    result = await resp.json(content_type=None)
                except Exception:
                    return

                if not isinstance(result, dict):
                    return

                await _handle_reply(result, event, api, logger)

    except Exception as exc:
        logger.error("命令回调异常: url=%s error=%s", COMMAND_CALLBACK_URL, exc)


async def _handle_reply(result: dict, event, api, logger) -> None:
    """处理回调响应，自动回复到原消息来源。"""
    group_id = result.get("group_id") or (getattr(event.data, "group_id", None))
    user_id = result.get("user_id") or event.data.user_id
    messages = result.get("messages")
    reply = result.get("reply")

    # 批量回复（使用 post_group_msg / post_private_msg 组合消息段）
    if messages and isinstance(messages, list):
        text_parts: list[str] = []
        image_url: str | None = None
        video_url: str | None = None
        file_msgs: list[dict] = []

        for msg in messages:
            msg_type = msg.get("type", "text")
            if msg_type == "text":
                text_parts.append(msg.get("msg", ""))
            elif msg_type == "image":
                image_url = msg.get("url")
            elif msg_type == "video":
                video_url = msg.get("url")
            elif msg_type == "file":
                file_msgs.append(msg)

        text = "\n".join(text_parts) if text_parts else None

        try:
            if group_id:
                if text or image_url or video_url:
                    await api.qq.post_group_msg(
                        group_id=group_id, text=text, image=image_url, video=video_url,
                    )
                for fm in file_msgs:
                    url = fm.get("url", "")
                    await api.qq.send_group_file(
                        group_id=group_id, file=url, name=url.split("/")[-1],
                    )
            else:
                if text or image_url or video_url:
                    await api.qq.post_private_msg(
                        user_id=user_id, text=text, image=image_url, video=video_url,
                    )
                for fm in file_msgs:
                    url = fm.get("url", "")
                    await api.qq.send_private_file(
                        user_id=user_id, file=url, name=url.split("/")[-1],
                    )
        except Exception as exc:
            logger.error("命令回复失败: %s", exc)
        return

    # 纯文本回复
    if reply and isinstance(reply, str):
        try:
            if group_id:
                await api.qq.send_group_text(group_id=group_id, text=reply)
            else:
                await api.qq.send_private_text(user_id=user_id, text=reply)
        except Exception as exc:
            logger.error("命令回复失败: %s", exc)