/**
 * SPDX-License-Identifier: GPL-3.0-only
 * 移植自 MoviePilot(https://github.com/jxxghp/MoviePilot,GPLv3),本文件按 GPLv3 条款提供。
 * @mp-source app/foundation/text.py @ 3b156a5
 * @mp-source app/foundation/temporal.py @ 3b156a5
 * @mp-source app/domain/site.py @ 3b156a5
 * @mp-source app/adapters/network/cloudflare.py @ 3b156a5
 *
 * 解析器公共工具:MoviePilot 3b156a5(GPLv3)
 * - `app/foundation/text.py` `parse_int/parse_float/contains_chinese` → `parseIntMp/parseFloatMp/containsChinese`
 * - `app/foundation/temporal.py` `normalize_datetime/format_timestamp` → 同名(dateparser 的保守子集)
 * - `app/domain/site.py` `SiteUtils.is_logged_in` → `isLoggedIn`
 * - `app/adapters/network/cloudflare.py` `under_challenge` → `underChallenge`
 * - `app/domain/site.py` `extract_domain` → `extractDomain`(与 mteam/definition.ts `rootDomain` 同义)
 */
import { load } from "cheerio";
import { hasChildElements, parseHtml } from "./dom.ts";

/** MP `parse_int`:去千分位,失败返回 0 */
export function parseIntMp(value: string | number | null | undefined): number {
  if (value == null) return 0;
  const s = String(value).trim().replace(/,/g, "");
  if (!/^[+-]?\d+$/.test(s)) return 0;
  return Number.parseInt(s, 10);
}

/** MP `parse_float`:去千分位,失败返回 0 */
export function parseFloatMp(value: string | number | null | undefined): number {
  if (value == null) return 0;
  const s = String(value).trim().replace(/,/g, "");
  if (s === "") return 0;
  if (!/^[+-]?(\d+\.?\d*|\.\d+)([eE][+-]?\d+)?$/.test(s) && !/^[+-]?(inf|infinity|nan)$/i.test(s)) return 0;
  const n = Number(s);
  return Number.isFinite(n) ? n : 0;
}

/** Python `int(str)`(带 strip);非法抛错,与 MP 一致交给调用方 */
export function pyInt(value: unknown): number {
  if (typeof value === "number") return Math.trunc(value);
  if (typeof value === "boolean") return value ? 1 : 0;
  const s = String(value ?? "").trim();
  if (!/^[+-]?\d+$/.test(s)) throw new Error(`invalid literal for int(): '${s}'`);
  return Number.parseInt(s, 10);
}

/** Python `float(str)`;非法抛错 */
export function pyFloat(value: unknown): number {
  if (typeof value === "number") return value;
  const s = String(value ?? "").trim();
  const n = Number(s);
  if (s === "" || Number.isNaN(n)) throw new Error(`could not convert string to float: '${s}'`);
  return n;
}

export function containsChinese(value: string | string[] | null | undefined): boolean {
  if (!value) return false;
  const s = Array.isArray(value) ? value.join(" ") : value;
  return /[一-鿿]/.test(s);
}

const MONTHS: Record<string, number> = {
  jan: 1,
  feb: 2,
  mar: 3,
  apr: 4,
  may: 5,
  jun: 6,
  jul: 7,
  aug: 8,
  sep: 9,
  sept: 9,
  oct: 10,
  nov: 11,
  dec: 12,
  january: 1,
  february: 2,
  march: 3,
  april: 4,
  june: 6,
  july: 7,
  august: 8,
  september: 9,
  october: 10,
  november: 11,
  december: 12,
};

const pad = (n: number | string) => String(Number(n)).padStart(2, "0");

/**
 * MP `normalize_datetime`(dateparser.parse 后 strftime("%Y-%m-%d %H:%M:%S"),失败原样返回)。
 * 这里只实现确定性的绝对时间格式:
 * - `YYYY-MM-DD[ T]HH:MM[:SS][.fff][Z|±HH:MM]`、`YYYY/MM/DD`、`YYYY年MM月DD日`(时区后缀按 dateparser 行为丢弃,保留墙钟时间)
 * - `DD Mon YYYY[, HH:MM]`、`Mon DD[,] YYYY [HH:MM]`(英文月份)
 * 相对时间("3 天前"/"2 hours ago")dateparser 会以当前时间换算,本实现不做(原样返回,标记待核验)。
 */
export function normalizeDatetime(value: string | null | undefined): string | null | undefined {
  if (!value) return value;
  const v = String(value).trim();
  let m =
    /^(\d{4})[-/.年](\d{1,2})[-/.月](\d{1,2})日?(?:[ T]+(\d{1,2}):(\d{1,2})(?::(\d{1,2}))?(?:\.\d+)?)?\s*(?:Z|[+-]\d{2}:?\d{2}|UTC|GMT)?$/i.exec(
      v,
    );
  if (m) return `${m[1]}-${pad(m[2]!)}-${pad(m[3]!)} ${pad(m[4] ?? 0)}:${pad(m[5] ?? 0)}:${pad(m[6] ?? 0)}`;
  m =
    /^(\d{1,2})(?:st|nd|rd|th)?\s+([A-Za-z]{3,9})\.?,?\s+(\d{4})(?:,?\s+(?:at\s+)?(\d{1,2}):(\d{2})(?::(\d{2}))?\s*(am|pm)?)?$/i.exec(
      v,
    );
  if (m && MONTHS[m[2]!.toLowerCase()]) {
    const h = ampm(m[4], m[7]);
    return `${m[3]}-${pad(MONTHS[m[2]!.toLowerCase()]!)}-${pad(m[1]!)} ${pad(h)}:${pad(m[5] ?? 0)}:${pad(m[6] ?? 0)}`;
  }
  m =
    /^([A-Za-z]{3,9})\.?\s+(\d{1,2})(?:st|nd|rd|th)?,?\s+(\d{4})(?:,?\s+(?:at\s+)?(\d{1,2}):(\d{2})(?::(\d{2}))?\s*(am|pm)?)?$/i.exec(
      v,
    );
  if (m && MONTHS[m[1]!.toLowerCase()]) {
    const h = ampm(m[4], m[7]);
    return `${m[3]}-${pad(MONTHS[m[1]!.toLowerCase()]!)}-${pad(m[2]!)} ${pad(h)}:${pad(m[5] ?? 0)}:${pad(m[6] ?? 0)}`;
  }
  return value;
}

function ampm(h: string | undefined, suffix: string | undefined): number {
  let n = Number(h ?? 0);
  if (suffix?.toLowerCase() === "pm" && n < 12) n += 12;
  if (suffix?.toLowerCase() === "am" && n === 12) n = 0;
  return n;
}

/**
 * MP `format_timestamp`:非纯数字字符串原样返回;Unix 秒 → 本地时间 "YYYY-MM-DD HH:MM:SS"。
 * MP 用进程本地时区;这里用显式 `tzOffsetMinutes`(默认 +480,即 Asia/Shanghai,MP 容器默认 TZ)。
 */
export function formatTimestamp(timestamp: unknown, tzOffsetMinutes = 480): string | undefined {
  if (timestamp == null) return undefined;
  if (typeof timestamp === "string" && !/^\d+$/.test(timestamp)) return timestamp;
  const n = Number(timestamp);
  if (!Number.isFinite(n)) return String(timestamp);
  const d = new Date(Math.trunc(n) * 1000 + tzOffsetMinutes * 60_000);
  return `${d.getUTCFullYear()}-${pad(d.getUTCMonth() + 1)}-${pad(d.getUTCDate())} ${pad(d.getUTCHours())}:${pad(d.getUTCMinutes())}:${pad(d.getUTCSeconds())}`;
}

/** MP `SiteUtils.is_logged_in` */
export function isLoggedIn(htmlText: string): boolean {
  const html = parseHtml(htmlText);
  if (!hasChildElements(html)) return false;
  if (html.nodes("//input[@type='password']").length) return false;
  const xpaths = [
    '//a[contains(@href, "logout") or contains(@data-url, "logout") or contains(@href, "mybonus")  or contains(@onclick, "logout") or contains(@href, "usercp") or contains(@lay-on, "logout")]',
    '//form[contains(@action, "logout")]',
    '//div[@class="user-info-side"]',
    '//a[@id="myitem"]',
  ];
  return xpaths.some((x) => html.nodes(x).length > 0);
}

const CHALLENGE_TITLES = ["Just a moment...", "请稍候…", "DDOS-GUARD"];
const CHALLENGE_SELECTORS = [
  "#cf-challenge-running",
  ".ray_id",
  ".attack-box",
  "#cf-please-wait",
  "#challenge-spinner",
  "#trk_jschal_js",
  "td.info #js_info",
  "div.vc div.text-box h2",
];

/** MP `under_challenge`:Cloudflare / DDoS-Guard 挑战页 */
export function underChallenge(htmlText: string | null | undefined): boolean {
  if (!htmlText) return false;
  const $ = load(htmlText);
  const title = $("title").text().trim().toLowerCase();
  if (CHALLENGE_TITLES.some((t) => t.toLowerCase() === title)) return true;
  return CHALLENGE_SELECTORS.some((s) => $(s).length > 0);
}

const SPECIAL_SITE_DOMAINS = ["u2.dmhy.org", "pt.ecust.pp.ua", "pt.gtkpw.xyz", "pt.gtk.pw"];

/** MP `site_rules.extract_domain`:特殊域名表 → netloc 超过 3 级原样 → 否则取最后两级 */
export function extractDomain(url: string | null | undefined): string {
  if (!url) return "";
  for (const d of SPECIAL_SITE_DOMAINS) if (url.includes(d)) return d;
  let netloc: string;
  if (!url.startsWith("http")) netloc = url;
  else {
    try {
      netloc = new URL(url).host;
    } catch {
      return "";
    }
  }
  if (!netloc) return "";
  netloc = netloc.replace(/^\.+/, "");
  if (!netloc) return "";
  const labels = netloc.split(".");
  if (labels.length > 3) return netloc;
  return labels.slice(-2).join(".");
}

/** Python `re.search(...)`: 返回 match 或 null(显式 helper,方便逐行对照) */
export function reSearch(pattern: RegExp, text: string | null | undefined): RegExpExecArray | null {
  if (text == null) return null;
  const re = new RegExp(pattern.source, pattern.flags.replace("g", ""));
  return re.exec(text);
}

/** Python `re.findall`(带分组时返回分组数组) */
export function reFindall(pattern: RegExp, text: string): string[][] {
  const re = new RegExp(pattern.source, pattern.flags.includes("g") ? pattern.flags : `${pattern.flags}g`);
  return [...text.matchAll(re)].map((m) => m.slice(1));
}