/**
 * 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/modules/indexer/spider/rousi.py @ 3b156a5
 *
 * Rousi.pro PeerGo 兼容 API(parser "RousiPro",Bearer 个人 API Key,需 torrent:read + torrent:download)。
 * 函数对照 `RousiSpider`:
 * - `_movie_category/_tv_category/_music_category` → `ROUSI_*_CATEGORY`
 * - `get_search_page_size` → `pageSize`(100)
 * - `__get_params` → `rousiSearchParams`;`__get_category_names_by_ids` → `rousiCategoryNamesByIds`
 * - `__process_response` → `rousiSpider.search` 错误分支;`__parse_result` → `parseRousiResult`
 * - `__get_download_url`(GET 详情接口,result=data.download_url)→ `rousiSpider.resolveDownload`(现场换票,不生成含 key 的 enclosure)
 */
import type { MpMediaType } from "../spider/spider.ts";
import { extractDomain, normalizeDatetime } from "../user-parsers/common.ts";
import {
  apiRequest,
  businessError,
  checkReleaseId,
  downloadTorrentFile,
  isoWithZoneToUtc,
  isPlainObject,
  resolveIndirectDownloadUrl,
  toFloat,
  toInt,
} from "./common.ts";
import type { SpecializedSiteDefinition, SpecializedSpider, SpecializedTorrent, SpiderSearchQuery } from "./types.ts";

/** API 不支持多分类搜索,每次只使用一个分类 */
export const ROUSI_MOVIE_CATEGORY = "movie";
export const ROUSI_TV_CATEGORY = "tv";
export const ROUSI_MUSIC_CATEGORY = "music";

const ROUSI_ID_TO_NAME: Record<string, string> = {
  "1": "movie",
  "2": "tv",
  "3": "documentary",
  "4": "animation",
  "5": "music",
  "6": "variety",
};

/** 站点 origin(MP `https://%s` % extract_domain(domain)) */
export function rousiBase(def: SpecializedSiteDefinition): string {
  return (def.umt.apiBaseUrl ?? `https://${extractDomain(def.domain)}`).replace(/\/+$/, "");
}

/** MP `__get_category_names_by_ids` */
export function rousiCategoryNamesByIds(cat: string | null | undefined): string[] | null {
  if (!cat) return null;
  const ids = cat
    .split(",")
    .map((c) => c.trim())
    .filter(Boolean);
  const names = ids.filter((id) => id in ROUSI_ID_TO_NAME).map((id) => ROUSI_ID_TO_NAME[id]!);
  return names.length ? names : null;
}

/** MP `__get_params` */
export function rousiSearchParams(q: SpiderSearchQuery): Record<string, string | number> {
  const params: Record<string, string | number> = { page: Number(q.page ?? 0) + 1, page_size: 100 };
  if (q.keyword) params.keyword = q.keyword;
  if (q.cat) {
    const names = rousiCategoryNamesByIds(q.cat);
    if (names) params.category = names[0]!;
  } else if (q.mtype) {
    if (q.mtype === "movie") params.category = ROUSI_MOVIE_CATEGORY;
    else if (q.mtype === "tv") params.category = ROUSI_TV_CATEGORY;
    else if (q.mtype === "music") params.category = ROUSI_MUSIC_CATEGORY;
  }
  return params;
}

export interface RousiItem {
  id: number | string;
  title?: string;
  subtitle?: string;
  category?: string | { slug?: string; name?: string } | null;
  size?: number | string;
  seeders?: number | string;
  leechers?: number | string;
  downloads?: number | string;
  created_at?: string;
  promotion?: { is_active?: boolean; down_multiplier?: number; up_multiplier?: number; until?: string } | null;
  [k: string]: unknown;
}

/** MP `__parse_result` */
export function parseRousiResult(results: RousiItem[] | null | undefined, def: SpecializedSiteDefinition) {
  const torrents: SpecializedTorrent[] = [];
  if (!results?.length) return torrents;
  const base = rousiBase(def);
  for (const result of results) {
    const rawCat = result.category;
    let catVal: string | null | undefined = null;
    let category: MpMediaType = "未知";
    if (rawCat && typeof rawCat === "object") catVal = rawCat.slug || rawCat.name;
    else if (typeof rawCat === "string") catVal = rawCat;
    if (catVal) {
      catVal = String(catVal).toLowerCase();
      if (catVal === ROUSI_MOVIE_CATEGORY) category = "电影";
      else if (catVal === ROUSI_TV_CATEGORY) category = "电视剧";
      else if (catVal === ROUSI_MUSIC_CATEGORY) category = "音乐";
    }
    // API 后端已处理全站促销优先级,直接使用返回的 promotion 数据
    let dl = 1.0;
    let ul = 1.0;
    let freedate: string | undefined;
    let freedateUtc: string | undefined;
    const promotion = result.promotion;
    if (promotion?.is_active) {
      dl = toFloat(promotion.down_multiplier ?? 1.0);
      ul = toFloat(promotion.up_multiplier ?? 1.0);
      if (promotion.until) {
        freedate = normalizeDatetime(promotion.until) ?? undefined;
        freedateUtc = isoWithZoneToUtc(promotion.until);
      }
    }
    const id = result.id;
    const t: SpecializedTorrent = {
      title: result.title,
      description: result.subtitle,
      size: toInt(result.size),
      seeders: toInt(result.seeders),
      peers: toInt(result.leechers),
      grabs: toInt(result.downloads),
      downloadvolumefactor: dl,
      uploadvolumefactor: ul,
      page_url: `${base}/torrents/${id}`,
      labels: [],
      category,
      site_release_id: String(id),
    };
    const pubdate = normalizeDatetime(result.created_at);
    if (pubdate) t.pubdate = pubdate;
    const pubUtc = isoWithZoneToUtc(result.created_at);
    if (pubUtc) t.pubdate_utc = pubUtc;
    if (freedate) t.freedate = freedate;
    if (freedateUtc) t.freedate_utc = freedateUtc;
    if (catVal) t.category_id = catVal;
    torrents.push(t);
  }
  return torrents;
}

export const rousiSpider: SpecializedSpider = {
  parser: "RousiPro",
  credential: "apiKey",
  pageSize: () => 100,
  async search(ctx, q) {
    const apikey = await ctx.secret("apiKey", true);
    const data = await apiRequest(ctx, `${rousiBase(ctx.def)}/api/v1/torrents`, {
      method: "GET",
      headers: { Authorization: `Bearer ${apikey}`, Accept: "application/json" },
      query: rousiSearchParams(q),
    });
    if (!isPlainObject(data)) throw businessError(ctx, "搜索", "搜索响应结构无效");
    if (data.code === 0) {
      const d = isPlainObject(data.data) ? data.data : {};
      return parseRousiResult((d.torrents as RousiItem[]) ?? [], ctx.def);
    }
    throw businessError(ctx, "搜索", data.message);
  },
  async resolveDownload(ctx, siteReleaseId) {
    const apikey = await ctx.secret("apiKey", true);
    const id = checkReleaseId(ctx.def.id, siteReleaseId);
    // MP __get_download_url:method=get, cookie=False, Bearer, result=data.download_url
    const url = await resolveIndirectDownloadUrl(ctx, `${rousiBase(ctx.def)}/api/v1/torrents/${id}`, {
      method: "get",
      header: { Authorization: `Bearer ${apikey}`, Accept: "application/json" },
      result: "data.download_url",
    });
    return downloadTorrentFile(ctx, url);
  },
};