import base64
import hashlib
import hmac
import sys
import time
from datetime import datetime, timedelta
from pathlib import Path
from typing import Dict
from zoneinfo import ZoneInfo

import requests

# 支持直接以脚本方式运行：python scheduler/decode_hourly_stats_job.py
_PROJECT_ROOT = Path(__file__).resolve().parent.parent
if str(_PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(_PROJECT_ROOT))

from utils.scheduler_logger import get_scheduler_logger
from utils.sync_mysql_help import mysql


logger = get_scheduler_logger()
_TZ = ZoneInfo("Asia/Shanghai")
_FEISHU_WEBHOOK = "https://open.feishu.cn/open-apis/bot/v2/hook/af94b535-ed47-47d8-87f4-d893e1077276"
_FEISHU_SIGN_SECRET = "lebZtBVkKJrbaVFlss2Pcf"
_ALERT_FAIL_RATE = 0.15
_ALERT_SUCCESS_RATE = 0.20


def _previous_hour_window(now: datetime) -> tuple[datetime, datetime]:
    current_hour = now.replace(minute=0, second=0, microsecond=0)
    return current_hour - timedelta(hours=1), current_hour


def _fetch_hourly_stats(window_start: datetime, window_end: datetime) -> Dict[str, int]:
    sql = """
        SELECT
            COUNT(1) AS total_count,
            SUM(CASE WHEN status = 2 THEN 1 ELSE 0 END) AS success_count,
            SUM(CASE WHEN status = 0 THEN 1 ELSE 0 END) AS pending_count,
            SUM(CASE WHEN status = 1 THEN 1 ELSE 0 END) AS running_count,
            SUM(CASE WHEN status = 3 THEN 1 ELSE 0 END) AS fail_count
        FROM aigc_topic_decode_task_result
        WHERE create_time >= %s
          AND create_time < %s
    """
    row = mysql.fetchone(
        sql,
        (
            window_start.strftime("%Y-%m-%d %H:%M:%S"),
            window_end.strftime("%Y-%m-%d %H:%M:%S"),
        ),
    )
    return {
        "total": int((row or {}).get("total_count") or 0),
        "success": int((row or {}).get("success_count") or 0),
        "pending": int((row or {}).get("pending_count") or 0),
        "running": int((row or {}).get("running_count") or 0),
        "fail": int((row or {}).get("fail_count") or 0),
    }


def _fetch_today_stats(now: datetime) -> Dict[str, int]:
    day_start = now.replace(hour=0, minute=0, second=0, microsecond=0)
    sql = """
        SELECT
            SUM(CASE WHEN status IN (1, 2, 3) THEN 1 ELSE 0 END) AS executed_count
        FROM aigc_topic_decode_task_result
        WHERE create_time >= %s
          AND create_time < %s
    """
    row = mysql.fetchone(
        sql,
        (
            day_start.strftime("%Y-%m-%d %H:%M:%S"),
            now.strftime("%Y-%m-%d %H:%M:%S"),
        ),
    )
    executed_total = int((row or {}).get("executed_count") or 0)
    demand_total = _fetch_decode_daily_limit()
    pending_total = max(demand_total - executed_total, 0)
    return {
        "executed_total": executed_total,
        "pending_total": pending_total,
    }


def _fetch_decode_daily_limit() -> int:
    sql = """
        SELECT `max` AS daily_limit
        FROM aigc_topic_decode_task_oprate
        ORDER BY id DESC
        LIMIT 1
    """
    row = mysql.fetchone(sql)
    return int((row or {}).get("daily_limit") or 0)


def _has_overdue_pending_task(now: datetime) -> bool:
    overdue_before = now - timedelta(minutes=30)
    sql = """
        SELECT COUNT(1) AS total_count
        FROM aigc_topic_decode_task_result
        WHERE status IN (0, 1)
          AND create_time <= %s
    """
    row = mysql.fetchone(sql, (overdue_before.strftime("%Y-%m-%d %H:%M:%S"),))
    return int((row or {}).get("total_count") or 0) > 0


def _gen_feishu_sign(timestamp: str, secret: str) -> str:
    # 与飞书文档一致：把 timestamp + "\n" + 密钥 作为 key，对空串做 HmacSHA256 再 Base64
    # https://open.feishu.cn/document/client-docs/bot-v3/add-custom-bot
    string_to_sign = "{}\n{}".format(timestamp, secret)
    hmac_code = hmac.new(
        string_to_sign.encode("utf-8"),
        b"",
        digestmod=hashlib.sha256,
    ).digest()
    return base64.b64encode(hmac_code).decode("utf-8")


def _build_feishu_card(
    *,
    is_alert: bool,
    window_start: datetime,
    window_end: datetime,
    total: int,
    success: int,
    pending: int,
    running: int,
    fail: int,
    fail_rate: float,
    today_executed_total: int,
    today_pending_total: int,
) -> Dict:
    header_title = "票圈供给-AIGC选题解构任务小时统计"
    header_subtitle = (
        f"{window_start.strftime('%Y-%m-%d %H:%M')} - {window_end.strftime('%H:%M')}"
    )
    level_tag = "异常告警" if is_alert else "运行正常"
    template = "red" if is_alert else "blue"
    if is_alert:
        if fail_rate > _ALERT_FAIL_RATE:
            status_line = "⚠️ 当前失败率已超过阈值，请尽快排查"
        else:
            status_line = "⚠️ 当前成功率偏低且存在超时任务，请尽快排查"
    else:
        status_line = "✅ 当前任务运行正常"

    markdown_lines = [
        status_line,
        f"**发起数**：{total}",
        f"**成功数**：{success}",
        f"**执行中数**：{pending + running}",
        f"**失败数**：{fail}",
        f"**失败率**：{fail_rate:.2%}",
        f"**当日已执行总数**：{today_executed_total}",
        f"**当日待执行总数**：{today_pending_total}",
    ]
    body_elements = [
        {
            "tag": "markdown",
            "content": "\n".join(markdown_lines),
            "text_align": "left",
        }
    ]
    if is_alert:
        body_elements.insert(
            0,
            {
                "tag": "markdown",
                "content": "<at id=all></at>",
                "text_align": "left",
            },
        )

    return {
        "schema": "2.0",
        "config": {
            "enable_forward": True,
            "update_multi": True,
            "width_mode": "compact",
        },
        "header": {
            "title": {
                "tag": "plain_text",
                "content": header_title,
            },
            "subtitle": {
                "tag": "plain_text",
                "content": header_subtitle,
            },
            "text_tag_list": [
                {
                    "tag": "text_tag",
                    "text": {
                        "tag": "plain_text",
                        "content": level_tag,
                    },
                    "color": "red" if is_alert else "green",
                }
            ],
            "template": template,
            "padding": "12px 12px 12px 12px",
        },
        "body": {
            "direction": "vertical",
            "padding": "12px 12px 12px 12px",
            "horizontal_align": "left",
            "vertical_spacing": "8px",
            "elements": body_elements,
        },
    }


def _send_feishu_card(card: Dict) -> None:
    timestamp = str(int(time.time()))
    sign = _gen_feishu_sign(timestamp, _FEISHU_SIGN_SECRET)
    payload = {
        "timestamp": timestamp,
        "sign": sign,
        "msg_type": "interactive",
        "card": card,
    }
    resp = requests.post(_FEISHU_WEBHOOK, json=payload, timeout=10)
    if resp.status_code != 200:
        raise RuntimeError(f"send_feishu_http_status_{resp.status_code}")
    body = resp.json()
    if body.get("code") != 0:
        raise RuntimeError(f"send_feishu_failed code={body.get('code')} msg={body.get('msg')}")


def run_decode_hourly_stats_job() -> None:
    now = datetime.now(_TZ)
    window_start, window_end = _previous_hour_window(now)
    logger.info(
        "解构小时统计任务开始，统计窗口=[{}, {})",
        window_start.strftime("%Y-%m-%d %H:%M:%S"),
        window_end.strftime("%Y-%m-%d %H:%M:%S"),
    )
    try:
        stats = _fetch_hourly_stats(window_start, window_end)
        total = stats["total"]
        success = stats["success"]
        pending = stats["pending"]
        running = stats["running"]
        fail = stats["fail"]
        executed_in_window = success + running + fail
        if executed_in_window <= 0:
            logger.info(
                "当前统计窗口无已执行任务，跳过推送 window=[{}, {}) total={} pending={}",
                window_start.strftime("%Y-%m-%d %H:%M:%S"),
                window_end.strftime("%Y-%m-%d %H:%M:%S"),
                total,
                pending,
            )
            return
        fail_rate = (fail / total) if total > 0 else 0.0
        success_rate = (success / total) if total > 0 else 0.0
        today_stats = _fetch_today_stats(now)
        today_executed_total = today_stats["executed_total"]
        today_pending_total = today_stats["pending_total"]
        has_overdue_pending_task = _has_overdue_pending_task(now)
        is_alert = total > 0 and (
            fail_rate > _ALERT_FAIL_RATE
            or (success_rate < _ALERT_SUCCESS_RATE and has_overdue_pending_task)
        )
        card = _build_feishu_card(
            is_alert=is_alert,
            window_start=window_start,
            window_end=window_end,
            total=total,
            success=success,
            pending=pending,
            running=running,
            fail=fail,
            fail_rate=fail_rate,
            today_executed_total=today_executed_total,
            today_pending_total=today_pending_total,
        )
        _send_feishu_card(card)
        logger.info(
            "解构小时统计推送完成 total={} success={} pending={} running={} fail={} fail_rate={:.2%} success_rate={:.2%} has_overdue_pending_task={} is_alert={}",
            total,
            success,
            pending,
            running,
            fail,
            fail_rate,
            success_rate,
            has_overdue_pending_task,
            is_alert,
        )
    except Exception as exc:
        logger.exception("解构小时统计任务失败: {}", exc)

if __name__ == "__main__":
    run_decode_hourly_stats_job()