from __future__ import annotations

import asyncio
from html import escape
from typing import Any

from aiohttp import ClientError, ClientSession, ClientTimeout

from wbb.utils.dbservice import (
    get_review,
    get_service_settings,
    get_technician_review_topic,
    get_technician_service_profile,
    mark_review_topic_publish_error,
    mark_review_topic_published,
    save_technician_review_topic,
)


class ReviewTopicError(RuntimeError):
    pass


_topic_locks: dict[int, asyncio.Lock] = {}


async def _bot_api(
    bot_token: str,
    method: str,
    payload: dict[str, Any],
) -> dict[str, Any]:
    if not bot_token:
        raise ReviewTopicError("当前 Bot 凭据不可用。")
    url = f"https://api.telegram.org/bot{bot_token}/{method}"
    try:
        async with ClientSession(timeout=ClientTimeout(total=20)) as session:
            async with session.post(url, json=payload) as response:
                data = await response.json(content_type=None)
    except (ClientError, TimeoutError, ValueError) as exc:
        raise ReviewTopicError("Telegram 评价话题请求失败。") from exc
    if response.status >= 400 or not data.get("ok"):
        description = str(data.get("description") or "Telegram 返回未知错误")
        raise ReviewTopicError(description[:240])
    result = data.get("result")
    return result if isinstance(result, dict) else {}


def _topic_url(forum_username: str, message_thread_id: int) -> str:
    username = str(forum_username or "").strip().lstrip("@")
    if not username:
        raise ReviewTopicError("请先配置公开评价群用户名。")
    return f"https://t.me/{username}/{int(message_thread_id)}"


async def ensure_technician_review_topic(
    bot_token: str,
    technician_id: int,
) -> dict[str, Any] | None:
    settings = await get_service_settings()
    forum_chat_id = str(settings.get("review_forum_chat_id") or "").strip()
    forum_username = str(settings.get("review_forum_username") or "").strip()
    if not forum_chat_id or not forum_username or not bot_token:
        return None
    technician_id = int(technician_id)
    current = await get_technician_review_topic(technician_id)
    if current and str(current.get("forum_chat_id")) == forum_chat_id:
        return current
    lock = _topic_locks.setdefault(technician_id, asyncio.Lock())
    async with lock:
        current = await get_technician_review_topic(technician_id)
        if current and str(current.get("forum_chat_id")) == forum_chat_id:
            return current
        profile = await get_technician_service_profile(technician_id)
        display_name = str(
            profile.get("display_name") or f"技师 {technician_id}"
        ).strip()
        topic_name = f"{display_name} · 评价"[:128]
        created = await _bot_api(
            bot_token,
            "createForumTopic",
            {
                "chat_id": forum_chat_id,
                "name": topic_name,
            },
        )
        message_thread_id = int(created.get("message_thread_id") or 0)
        if message_thread_id <= 0:
            raise ReviewTopicError("Telegram 未返回有效的话题 ID。")
        topic = await save_technician_review_topic(
            technician_id=technician_id,
            forum_chat_id=forum_chat_id,
            forum_username=forum_username,
            message_thread_id=message_thread_id,
            topic_name=topic_name,
            topic_url=_topic_url(forum_username, message_thread_id),
        )
        await _bot_api(
            bot_token,
            "sendMessage",
            {
                "chat_id": forum_chat_id,
                "message_thread_id": message_thread_id,
                "text": (
                    f"<b>{escape(display_name)}的公开评价</b>\n"
                    "管理员审核通过的评价会自动发布在这里，任何群成员均可查看。"
                ),
                "parse_mode": "HTML",
                "disable_web_page_preview": True,
            },
        )
        return topic


def _review_message(review: dict[str, Any]) -> str:
    template = review.get("template_snapshot") or {}
    labels = {
        str(question.get("question_id")): str(question.get("label") or "")
        for question in template.get("questions", [])
    }
    author = (
        "匿名顾客"
        if review.get("anonymous", True)
        else str(review.get("customer_name") or "顾客")
    )
    package_name = str(
        (review.get("package_snapshot") or {}).get("name") or "其他服务"
    )
    lines = [
        f"<b>新评价 · {float(review.get('score') or 0):.1f} 分</b>",
        f"技师：{escape(str(review.get('technician_name') or review['technician_id']))}",
        f"服务：{escape(package_name)}",
        f"评价人：{escape(author)}",
    ]
    choice_answers = review.get("choice_answers") or {}
    text_answers = review.get("text_answers") or {}
    for question_id, answer in choice_answers.items():
        value = "、".join(str(item) for item in answer) if isinstance(answer, list) else str(answer)
        if value:
            lines.append(
                f"{escape(labels.get(str(question_id)) or '选择')}：{escape(value)}"
            )
    for question_id, answer in text_answers.items():
        if answer:
            lines.append(
                f"{escape(labels.get(str(question_id)) or '评价内容')}："
                f"{escape(str(answer))}"
            )
    return "\n".join(lines)


async def publish_approved_review(
    bot_token: str,
    review: dict[str, Any],
) -> dict[str, Any]:
    stored = await get_review(str(review["review_id"]))
    if stored:
        review = stored
    if review.get("topic_message_id"):
        return {
            "status": "published",
            "topic_url": review.get("topic_url"),
            "message_id": review.get("topic_message_id"),
        }
    try:
        topic = await ensure_technician_review_topic(
            bot_token,
            int(review["technician_id"]),
        )
        if not topic:
            return {
                "status": "unconfigured",
                "message": "尚未配置公开评价群。",
            }
        result = await _bot_api(
            bot_token,
            "sendMessage",
            {
                "chat_id": topic["forum_chat_id"],
                "message_thread_id": int(topic["message_thread_id"]),
                "text": _review_message(review),
                "parse_mode": "HTML",
                "disable_web_page_preview": True,
            },
        )
        message_id = int(result.get("message_id") or 0)
        if message_id <= 0:
            raise ReviewTopicError("Telegram 未返回有效的评价消息 ID。")
        await mark_review_topic_published(
            review["review_id"],
            topic=topic,
            message_id=message_id,
        )
        return {
            "status": "published",
            "topic_url": topic["topic_url"],
            "message_id": message_id,
        }
    except ReviewTopicError as exc:
        await mark_review_topic_publish_error(review["review_id"], str(exc))
        return {"status": "failed", "message": str(exc)}