"""
搜索评估工具：搜索帖子并评估是否与账号人设匹配，提取关键词并匹配选题点。

处理流程：
1. 接收 query_list（多个搜索 query），并发处理
2. 每个 query：使用 xhs（失败或空则用 zhihu）搜索帖子
3. 并发对每篇帖子调用 LLM 判断人设匹配 & 提取关键词
4. 对匹配人设的帖子，调用 match_derivation_to_post_points 匹配选题点
5. 返回按 query 分组的评估结果字典
6. 支持本地文件缓存（.cache/search/{account_name}/{post_id}/）
"""

import asyncio
import hashlib
import json
import logging
import re
import sys
from pathlib import Path
from typing import Dict, List, Optional

logger = logging.getLogger(__name__)

import httpx

# 保证直接运行或作为包加载时都能解析 utils/tools（IDE 可跳转）
_root = Path(__file__).resolve().parent.parent
if str(_root) not in sys.path:
    sys.path.insert(0, str(_root))

from tools.point_match import match_derivation_to_post_points

try:
    from agent.tools import tool, ToolResult, ToolContext
    from agent.llm.openrouter import openrouter_llm_call
except ImportError:
    def tool(*args, **kwargs):
        return lambda f: f
    ToolResult = None
    ToolContext = None
    openrouter_llm_call = None

_BASE_INPUT = Path(__file__).resolve().parent.parent / "input"
_TOOLS_DIR = Path(__file__).resolve().parent
_CACHE_ROOT = Path(__file__).resolve().parent.parent / ".cache" / "search"

BASE_URL = "http://aigc-channel.aiddit.com/aigc/channel"
DEFAULT_TIMEOUT = 60.0

# 支持多模态（视觉+文本）的 LLM 模型
EVAL_LLM_MODEL = "google/gemini-3-flash-preview"

# 每篇帖子最多传入的图片数量（避免 token 过多）
MAX_IMAGES_PER_POST = 20


def _load_match_and_extract_prompt() -> str:
    """读取帖子人设匹配 & 关键词提取的 system prompt 模板"""
    prompt_file = _TOOLS_DIR / "match_and_extract_prompt.md"
    with open(prompt_file, "r", encoding="utf-8") as f:
        return f.read()


def _load_persona_text(account_name: str) -> str:
    """读取账号人设摘要，返回可读字符串；文件不存在时返回空人设提示"""
    persona_file = _BASE_INPUT / account_name / "处理后数据" / "persona_data" / "persona_summary.json"
    if not persona_file.is_file():
        logger.warning("_load_persona_text: persona file not found: %s", persona_file)
        return f"账号：{account_name}（暂无人设数据）"
    with open(persona_file, "r", encoding="utf-8") as f:
        data = json.load(f)
    # 去掉不需要给 LLM 的中间推理字段，避免 prompt 过长或泄露分析细节
    if isinstance(data, dict):
        data.pop("分析过程", None)
    logger.debug("_load_persona_text: loaded persona for account=%s", account_name)
    return json.dumps(data, ensure_ascii=False, indent=2)


async def _do_search(query: str, channel: str) -> Optional[List[dict]]:
    """执行单次搜索，返回帖子列表；失败或空列表返回 None"""
    logger.debug("_do_search: channel=%s, query=%s", channel, query)
    payload = {
        "type": channel,
        "keyword": query,
        "cursor": "0",
        "max_count": 10,
        "content_type": "图文",
    }
    try:
        async with httpx.AsyncClient(timeout=DEFAULT_TIMEOUT) as client:
            resp = await client.post(
                f"{BASE_URL}/data",
                json=payload,
                headers={"Content-Type": "application/json"},
            )
            resp.raise_for_status()
            data = resp.json()
        posts = data.get("data") or []
        count = len(posts) if posts else 0
        logger.info("_do_search: channel=%s, query=%s -> %d posts", channel, query, count)
        return posts if posts else None
    except Exception as e:
        logger.warning("_do_search: channel=%s, query=%s failed: %s", channel, query, e)
        return None


async def _search_posts(query: str) -> List[dict]:
    """优先用 xhs 搜索，失败或空则用 zhihu，返回帖子列表"""
    xhs_query = query.replace(" ", "")
    posts = await _do_search(xhs_query, "xhs")
    if posts:
        logger.info("_search_posts: using xhs, %d posts for query=%s", len(posts), query)
        return posts
    posts = await _do_search(query, "zhihu")
    if posts:
        logger.info("_search_posts: xhs empty/failed, using zhihu, %d posts for query=%s", len(posts), query)
    else:
        logger.warning("_search_posts: no posts from xhs or zhihu for query=%s", query)
    return posts or []


def _build_user_message_content(post: dict) -> List[dict]:
    """
    将帖子数据构建为 OpenAI 多模态 user message content。
    包含帖子文本描述 + 前 MAX_IMAGES_PER_POST 张图片。
    """
    parts: List[dict] = []

    # 文本部分：将帖子的关键字段序列化给 LLM
    post_text = json.dumps(
        {
            "channel_content_id": post.get("channel_content_id", ""),
            "title": post.get("title", ""),
            "body_text": post.get("body_text", ""),
        },
        ensure_ascii=False,
    )
    parts.append({"type": "text", "text": post_text})

    # 图片部分
    images = post.get("images") or []
    for img_url in images[:MAX_IMAGES_PER_POST]:
        if img_url:
            parts.append({"type": "image_url", "image_url": {"url": img_url}})

    return parts


def _extract_json_object(content: str) -> dict:
    """从 LLM 回复中解析第一个 JSON 对象（允许被 ```json ... ``` 包裹）"""
    content = content.strip()
    m = re.search(r"```(?:json)?\s*([\s\S]*?)\s*```", content)
    if m:
        content = m.group(1).strip()
    # 找到最外层 { ... }
    start = content.find("{")
    end = content.rfind("}")
    if start != -1 and end != -1:
        content = content[start : end + 1]
    return json.loads(content)


async def _eval_single_post(
    post: dict,
    system_prompt: str,
    account_name: str,
    post_id: str,
) -> dict:
    """
    评估单篇帖子：
    1. 调用 LLM 判断人设匹配并提取关键词
    2. 若匹配，调用 match_derivation_to_post_points 匹配选题点
    返回完整评估结果字典。
    """
    post_cid = post.get("channel_content_id", "")
    result: dict = {
        "channel_content_id": post_cid,
        "title": post.get("title", ""),
        "body_text": post.get("body_text", ""),
        "images": post.get("images") or [],
        "persona_match_result": False,
        "persona_match_reason": "",
        "post_keywords": [],
        "point_match_results": [],
    }

    try:
        logger.debug("_eval_single_post: evaluating post_id=%s, title=%s", post_cid, (result["title"] or "")[:40])
        user_content = _build_user_message_content(post)
        messages = [
            {"role": "system", "content": system_prompt},
            {"role": "user", "content": user_content},
        ]

        llm_result = await openrouter_llm_call(messages, model=EVAL_LLM_MODEL)
        content = llm_result.get("content", "")
        if not content:
            result["error"] = "LLM 未返回内容"
            logger.warning("_eval_single_post: post_id=%s LLM returned empty content", post_cid)
            return result

        parsed = _extract_json_object(content)
        result["persona_match_result"] = bool(parsed.get("persona_match_result", False))
        result["persona_match_reason"] = parsed.get("persona_match_reason", "")
        result["post_keywords"] = parsed.get("post_keywords") or []
        logger.info(
            "_eval_single_post: post_id=%s persona_match=%s keywords=%s",
            post_cid,
            result["persona_match_result"],
            result["post_keywords"],
        )

        # 仅对与人设匹配的帖子做选题点匹配
        if result["persona_match_result"] and result["post_keywords"]:
            matched = await match_derivation_to_post_points(
                result["post_keywords"], account_name, post_id
            )
            result["point_match_results"] = matched
            logger.info(
                "_eval_single_post: post_id=%s point_match count=%d",
                post_cid,
                len(matched),
            )

    except Exception as e:
        logger.exception("_eval_single_post: post_id=%s error: %s", post_cid, e)
        result["error"] = str(e)

    return result


def _cache_key(query: str) -> str:
    """将 query 转为安全的文件名：使用 MD5 哈希避免特殊字符问题"""
    h = hashlib.md5(query.encode("utf-8")).hexdigest()[:12]
    safe = re.sub(r'[^\w\u4e00-\u9fff]+', '_', query)[:60].strip('_')
    return f"{safe}_{h}"


def _get_cache_path(account_name: str, post_id: str, query: str) -> Path:
    return _CACHE_ROOT / account_name / post_id / f"{_cache_key(query)}.json"


def _read_cache(account_name: str, post_id: str, query: str) -> Optional[List[dict]]:
    """读取缓存，存在且合法则返回帖子列表，否则返回 None"""
    path = _get_cache_path(account_name, post_id, query)
    if not path.is_file():
        return None
    try:
        with open(path, "r", encoding="utf-8") as f:
            data = json.load(f)
        if isinstance(data, list):
            logger.info("_read_cache: hit cache for query=%s, %d items", query, len(data))
            return data
    except Exception as e:
        logger.warning("_read_cache: failed to read cache for query=%s: %s", query, e)
    return None


def _write_cache(account_name: str, post_id: str, query: str, results: List[dict]) -> None:
    """写入缓存"""
    path = _get_cache_path(account_name, post_id, query)
    try:
        path.parent.mkdir(parents=True, exist_ok=True)
        with open(path, "w", encoding="utf-8") as f:
            json.dump(results, f, ensure_ascii=False, indent=2)
        logger.info("_write_cache: wrote cache for query=%s, %d items", query, len(results))
    except Exception as e:
        logger.warning("_write_cache: failed to write cache for query=%s: %s", query, e)


async def _search_and_eval_single_query(
    query: str,
    system_prompt: str,
    account_name: str,
    post_id: str,
) -> List[dict]:
    """处理单个 query 的搜索、评估、匹配流程，支持缓存"""
    cached = _read_cache(account_name, post_id, query)
    if cached is not None:
        return cached

    posts = await _search_posts(query)
    if not posts:
        logger.warning("_search_and_eval_single_query: no posts for query=%s", query)
        _write_cache(account_name, post_id, query, [])
        return []

    logger.info("_search_and_eval_single_query: got %d posts for query=%s", len(posts), query)
    tasks = [
        _eval_single_post(post, system_prompt, account_name, post_id)
        for post in posts
    ]
    results: List[dict] = await asyncio.gather(*tasks)

    _write_cache(account_name, post_id, query, results)
    return results


@tool()
async def search_and_eval(
    account_name: str,
    post_id: str,
    query_list: List[str],
    context: Optional[ToolContext] = None,
) -> ToolResult:
    """
    搜索帖子并评估是否与账号人设匹配，提取关键词并匹配选题点。
    支持多个 query 并发处理，结果按 query 分组返回。
    本地文件缓存：.cache/search/{account_name}/{post_id}/ 下每个 query 一个 JSON 文件。

    Args:
        account_name: 账号名称，用于读取人设数据和选题点文件
        post_id: 帖子ID，用于定位选题点匹配文件
        query_list: 搜索词列表，每个元素为一个 query 字符串

    Returns:
        ToolResult，output 为 JSON 格式的按 query 分组的结果字典：
        {
          "query1": [帖子评估结果列表],
          "query2": [帖子评估结果列表],
          ...
        }
        每个帖子评估结果包含：
        - channel_content_id, title, body_text, images
        - persona_match_result: 是否与账号人设匹配（bool）
        - post_keywords: 提取的帖子关键词列表
        - point_match_results: 关键词与帖子选题点的匹配结果列表
    """
    logger.info(
        "search_and_eval: account_name=%s post_id=%s query_list=%s",
        account_name,
        post_id,
        query_list,
    )

    if True:
        return ToolResult(
            title="搜索评估工具不可用",
            output="搜索评估工具不可用"
        )

    if not query_list:
        return ToolResult(
            title="搜索评估: 空 query_list",
            output="{}",
        )

    try:
        prompt_template = _load_match_and_extract_prompt()
        persona_text = _load_persona_text(account_name)
        system_prompt = prompt_template.replace("{persona}", persona_text)

        tasks = [
            _search_and_eval_single_query(q, system_prompt, account_name, post_id)
            for q in query_list
        ]
        all_results: List[List[dict]] = await asyncio.gather(*tasks)

        grouped: Dict[str, List[dict]] = {}
        total_posts = 0
        total_matched = 0
        for query, results in zip(query_list, all_results):
            grouped[query] = results
            total_posts += len(results)
            total_matched += sum(1 for r in results if r.get("persona_match_result"))

        logger.info(
            "search_and_eval: done. queries=%d total_posts=%d persona_matched=%d",
            len(query_list),
            total_posts,
            total_matched,
        )
        output = json.dumps(grouped, ensure_ascii=False, indent=2)

        return ToolResult(
            title=(
                f"搜索评估: {len(query_list)} 个 query "
                f"（共 {total_posts} 条帖子，{total_matched} 条匹配人设）"
            ),
            output=output,
            metadata={"search_and_eval summary": f"{len(query_list)} queries, found {total_posts} posts, {total_matched} matched persona"},
        )

    except Exception as e:
        logger.exception("search_and_eval: failed: %s", e)
        return ToolResult(
            title="搜索评估失败",
            output="",
            error=str(e),
        )


def main() -> None:
    """本地测试：用家有大志账号测试搜索评估"""
    import asyncio

    logging.basicConfig(
        level=logging.DEBUG,
        format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
        datefmt="%H:%M:%S",
    )
    account_name = "家有大志"
    post_id = "68fb6a5c000000000302e5de"
    query_list = ["柴犬 鞋子 啃坏"]

    async def run():
        if ToolResult is None:
            print("agent 依赖未安装，无法直接运行 tool 版本")
            return
        result = await search_and_eval(
            account_name=account_name,
            post_id=post_id,
            query_list=query_list,
        )
        if result.error:
            print(f"Error: {result.error}")
        else:
            print(result.title)
            grouped = json.loads(result.output)
            for query, items in grouped.items():
                print(f"\n  === query: {query} ({len(items)} posts) ===")
                for item in items:
                    print(
                        f"    [{item.get('persona_match_result')}] {item.get('title', '')[:30]}"
                        f" | keywords: {item.get('post_keywords')}"
                        f" | matches: {len(item.get('point_match_results', []))}"
                    )

    asyncio.run(run())


if __name__ == "__main__":
    _project_root = str(Path(__file__).resolve().parent.parent.parent.parent)
    if _project_root not in sys.path:
        sys.path.insert(0, _project_root)
    main()