import time
import math

from datetime import datetime
from typing import Optional, List, Dict
from pandas import DataFrame
from scipy import stats


class CrawlerAccountManagerConst:
    # 文章状态
    ARTICLE_LOW_SIMILARITY_STATUS = 0
    ARTICLE_INIT_STATUS = 1
    ARTICLE_PUBLISHED_STATUS = 2

    # 相似度阈值
    SIMILARITY_THRESHOLD = 0.4

    # 1天时间戳
    ONE_DAY_TIMESTAMP = 86400
    # 近30天时间戳
    THIRTY_DAYS_TIMESTAMP = 30 * ONE_DAY_TIMESTAMP


class CrawlerAccountManager(CrawlerAccountManagerConst):
    def __init__(self, pool, aliyun_log, trace_id):
        self.pool = pool
        self.aliyun_log = aliyun_log
        self.trace_id = trace_id

    @staticmethod
    def safe_float(x: float | None, default: float = 0.0) -> float:
        """把 None / NaN / Inf 统一替换成指定默认值"""
        return default if x is None or not math.isfinite(x) else float(x)

    async def get_crawling_accounts(self, platform) -> List[str]:
        """获取抓取账号信息"""
        match platform:
            case "weixin":
                query = f"""
                    select gh_id as 'account_id' from long_articles_accounts where is_using = 1;
                """
            case _:
                raise RuntimeError(f"Unknown platform: {platform}")

        account_list = await self.pool.async_fetch(query)
        return [i['account_id'] for i in account_list]


class WeixinAccountManager(CrawlerAccountManager):

    def __init__(self, pool, aliyun_log, trace_id):
        super().__init__(pool, aliyun_log, trace_id)
        self.pool = pool
        self.aliyun_log = aliyun_log
        self.trace_id = trace_id

    async def get_account_crawler_articles_info(
        self, account_id: str
    ) -> Optional[DataFrame]:
        """get articles and set as dataframe"""
        query = f"""
            select title, link, score, status, article_index, read_cnt, publish_time
            from crawler_meta_article where out_account_id = %s;
        """
        response = await self.pool.async_fetch(query=query, params=(account_id,))
        return DataFrame(
            response,
            columns=[
                "title",
                "link",
                "score",
                "status",
                "article_index",
                "read_cnt",
                "publish_time",
            ],
        )

    async def update_account_stat_detail(self, account_id: str, history_info: Dict, recently_info: Dict) -> int:
        """更新账号统计详情"""
        query = f"""
            update long_articles_accounts 
            set history_publish_frequency = %s, history_score_ci_lower = %s, 
                recent_publish_frequency= %s, recent_score_ci_lower = %s, update_date = %s
            where gh_id = %s;
        """
        return await self.pool.async_save(
            query=query, params=(
                history_info["publish_frequency"],
                history_info["ci_lower"],
                recently_info["publish_frequency"],
                recently_info["ci_lower"],
                account_id,
                datetime.today().strftime("%Y-%m-%d"),
            )
        )

    def analysis_dataframe(self, dataframe: DataFrame) -> Optional[Dict]:
        score_list = dataframe["score"].dropna()
        n = len(score_list)
        mean = score_list.mean() if n else 0.0
        # 置信区间
        if n < 2:
            ci_lower, ci_upper = 0.0, 0.0
        else:
            sem = stats.sem(score_list)  # 可能返回 NaN
            t_val = stats.t.ppf(0.975, df=n - 1)
            margin = t_val * sem if math.isfinite(sem) else 0.0
            ci_lower, ci_upper = mean - margin, mean + margin

        # 计算发文频率
        publish_times = dataframe["publish_time"].dropna()
        if len(publish_times) >= 2:
            delta = publish_times.max() - publish_times.min()
            publish_frequency = (len(publish_times) / delta
                                 * self.ONE_DAY_TIMESTAMP) if delta else 0.0
        else:
            publish_frequency = 0.0

        return {
        "publish_frequency": self.safe_float(publish_frequency),
        "ci_lower":         self.safe_float(ci_lower),
        "ci_upper":         self.safe_float(ci_upper),
    }

    async def analysis_single_account(self, account_id: str) -> None:
        dataframe = await self.get_account_crawler_articles_info(account_id)
        history_articles_analysis = self.analysis_dataframe(dataframe)
        thirty_days_before = int(time.time()) - self.THIRTY_DAYS_TIMESTAMP
        recent_30_days_df = dataframe[
            dataframe["publish_time"] >= thirty_days_before
            ]
        recent_30_days_analysis = self.analysis_dataframe(recent_30_days_df)
        await self.update_account_stat_detail(account_id, history_articles_analysis, recent_30_days_analysis)

    async def deal(self, platform, account_id_list: Optional[List[str]] = None) -> None:
        """deal"""
        if not account_id_list:
            account_id_list = await self.get_crawling_accounts(platform=platform)

        for account_id in account_id_list:
            await self.analysis_single_account(account_id)