import { NON_ENGLISH_RE, JUNIOR_TITLE_RE, SOFTWARE_TITLE_RE } from "./fetch.ts";
import type { Job } from "./fetch.ts";

const HEADERS = {
  "User-Agent":
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36",
  "Accept-Language": "en-US,en;q=0.9",
  Accept: "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
};

function decodeHtml(s: string): string {
  return s
    .replace(/&/g, "&")
    .replace(/&lt;/g, "<")
    .replace(/&gt;/g, ">")
    .replace(/&quot;/g, '"')
    .replace(/&#39;/g, "'")
    .replace(/&#(\d+);/g, (_, n) => String.fromCharCode(Number(n)))
    .replace(/\s+/g, " ")
    .trim();
}

function applyFilters(title: string): boolean {
  if (NON_ENGLISH_RE.test(title)) return false;
  if (JUNIOR_TITLE_RE.test(title)) return false;
  if (!SOFTWARE_TITLE_RE.test(title)) return false;
  return true;
}

const MS_STACK_RE = /\.net\b|\bc#|sharepoint|dynamics 365|power platform|\bsccm\b|intune|successfactors|\bsap\b/i;

// DE/FR indicator words, counted against a description we already have in hand.
// Mirrors the ≥ 6 threshold isEnglishContent uses on fetched pages.
const DE_FR_WORDS_RE =
  /\b(und|oder|wir|Sie|Ihre|Ihrer|Kenntnisse|Erfahrung|Aufgaben|Anforderungen|Stelle|Unternehmen|Mitarbeiter|Bereich|nous|vous|votre|pour|avec|des|les)\b/g;

function isEnglishDescription(description?: string): boolean {
  if (!description) return true; // nothing to judge — let the URL check in index.ts decide
  const text = description.replace(/<[^>]+>/g, " ").replace(/&[a-z]+;/g, " ");
  return (text.match(DE_FR_WORDS_RE) ?? []).length < 6;
}

// datacareer.ch — HTML listing at /jobs/?city=Basel
export async function fetchDataCareer(): Promise<Job[]> {
  const allJobs: Job[] = [];
  const seen = new Set<string>();

  for (let page = 1; page <= 10; page++) {
    if (page > 1) await Bun.sleep(400);
    process.stdout.write(`  page ${page} … `);

    const res = await fetch(
      `https://www.datacareer.ch/jobs/?city=Basel&page=${page}`,
      { headers: HEADERS }
    );
    if (!res.ok) { console.error(`failed (${res.status})`); break; }

    const html = await res.text();
    const articles = [...html.matchAll(/<article[^>]*listing-item[^>]*>(.*?)<\/article>/gs)];
    if (articles.length === 0) { console.log("0 items"); break; }

    let newOnPage = 0;
    for (const [, card] of articles) {
      const titleM = card.match(/class="link"[^>]*>([^<]+)/);
      const hrefM = card.match(/href="(https:\/\/www\.datacareer\.ch\/job\/(\d+)\/[^"]*)"\s+class="link"/);
      if (!titleM || !hrefM) continue;

      const title = decodeHtml(titleM[1]);
      if (!applyFilters(title)) continue;

      const id = `dc-${hrefM[2]}`;
      if (seen.has(id)) continue;
      seen.add(id);

      const companyM = card.match(/listing-item__info--item-company[^>]*>\s*([^<\s][^<]*)/);
      const locM = card.match(/listing-item__info--item-location[^>]*>\s*([^<\s][^<]*)/);
      const dateM = card.match(/listing-item__date[^>]*>\s*([\d\/]+)/);

      // Date comes as DD/MM/YYYY → reformat to YYYY-MM-DD
      let postedAt = "";
      const dm = dateM?.[1].match(/(\d{2})\/(\d{2})\/(\d{4})/);
      if (dm) postedAt = `${dm[3]}-${dm[2]}-${dm[1]}`;

      allJobs.push({
        id,
        title,
        company: companyM ? decodeHtml(companyM[1].trim()) : "",
        location: locM ? locM[1].trim() : "Basel",
        postedAt,
        link: hrefM[1],
        search: "datacareer.ch",
        source: "datacareer.ch",
      });
      newOnPage++;
    }

    console.log(`${articles.length} items, ${newOnPage} new`);
    if (articles.length < 8) break;
  }

  return allJobs;
}

// itjobs.ch — HTML scrape, jobs embedded as window.jobsList in page.
// Swept Switzerland-wide (no location filter): the board is small, ~210 jobs
// across 7 pages, and locking it to Basel returned only ~9.
// Each item carries its full description, so the DE/FR content check runs here
// instead of costing an extra page fetch per job in index.ts.
export async function fetchItJobsCh(): Promise<Job[]> {
  const allJobs: Job[] = [];
  const seen = new Set<string>();

  for (let page = 1; page <= 25; page++) {
    if (page > 1) await Bun.sleep(400);
    process.stdout.write(`  page ${page} … `);

    const res = await fetch(
      `https://www.itjobs.ch/jobs?page=${page}`,
      { headers: HEADERS }
    );
    // The board 404s one page past the end rather than serving an empty list.
    if (!res.ok) { console.log(`end (${res.status})`); break; }

    const html = await res.text();
    const blocks = [...html.matchAll(/window\.jobsList\s*=\s*window\.jobsList\.concat\((\[[\s\S]*?\])\);/g)];
    if (!blocks.length) { console.log("0 items"); break; }

    const items: Array<{
      id: number;
      title: string;
      description?: string;
      posted_at: string;
      job_details_path: string;
      employer: { name: string };
      location?: string;
      job_location?: { name?: string };
    }> = [];
    for (const [, json] of blocks) {
      try { items.push(...JSON.parse(json)); } catch { /* skip malformed block */ }
    }

    if (!items.length) { console.log("0 items"); break; }

    let newOnPage = 0;
    let langDropped = 0;
    for (const item of items) {
      const title = decodeHtml(item.title);
      if (!applyFilters(title)) continue;
      if (MS_STACK_RE.test(title)) continue;

      const id = `ij-${item.id}`;
      if (seen.has(id)) continue;
      seen.add(id);

      if (!isEnglishDescription(item.description)) { langDropped++; continue; }

      allJobs.push({
        id,
        title,
        company: item.employer?.name ?? "",
        // job_location.name is the English form ("Aarau, Aargau, Switzerland");
        // the bare location field is German ("Aarau, Kanton Aargau, Schweiz").
        location: item.job_location?.name ?? item.location ?? "Switzerland",
        postedAt: item.posted_at?.slice(0, 10) ?? "",
        link: `https://www.itjobs.ch${item.job_details_path}`,
        search: "itjobs.ch",
        source: "itjobs.ch",
        contentChecked: true, // isEnglishDescription already ran on the real description
      });
      newOnPage++;
    }

    console.log(`${items.length} items, ${newOnPage} new, ${langDropped} non-English`);
    if (items.length < 30) break;
  }

  return allJobs;
}

// job-room.ch — the federal employment service board (RAV / Arbeitsvermittlung).
// Roles under the Stellenmeldepflicht must be posted here before anywhere else,
// so it often carries a job days ahead of LinkedIn.
//
// Quirks worth knowing:
//  - Each hit is wrapped: [{ jobAdvertisement: {...} }, …]
//  - Titles come back with <em> highlighting around the matched keyword.
//  - `languageIsoCode` on a description is unreliable — plenty of records tagged
//    "de" carry English text (Roche, Novartis, Bachem all do). The DE/FR word
//    count is what actually decides, so we ignore the tag.
//  - An unfiltered canton sweep returns thousands of ads across every industry,
//    so we narrow by keyword instead and union the results.
//  - Descriptions arrive inline, so the language check runs here rather than
//    costing a page fetch per job in index.ts.
const JOBROOM_API = "https://www.job-room.ch/jobadservice/api/jobAdvertisements/_search";
const JOBROOM_CANTONS = ["BS", "BL", "BE", "ZH"];
const JOBROOM_KEYWORDS = [
  "software", "engineer", "developer", "devops", "data", "python",
  "cloud", "platform", "typescript", "backend", "full stack", "ai",
];

// job-room carries every industry; pharma/lab titles slip past SOFTWARE_TITLE_RE
// via words like "data", "director" and "technical".
const PHARMA_ROLE_RE =
  /\b(clinical|pharmaceutical|drug\s+(substance|product)|ha?ematology|oncology|formulation|laborator|lab\s+technician|chemist|chemistry|biolog|preclinical|regulatory\s+affairs|medical\s+affairs|commercial\s+launch|veterinary|pathologist)\b/i;

interface JobRoomAd {
  id: string;
  createdTime?: string;
  jobContent?: {
    externalUrl?: string | null;
    jobDescriptions?: Array<{ title: string; description?: string }>;
    company?: { name?: string; city?: string };
    location?: { city?: string; cantonCode?: string };
  };
}

// jobs.ch links arrive with a tracking query string that would break dedup
// across runs if it ever changes; the path alone identifies the posting.
function stripTracking(url: string): string {
  try {
    const u = new URL(url);
    for (const k of [...u.searchParams.keys()]) {
      if (k.startsWith("utm_")) u.searchParams.delete(k);
    }
    return u.toString().replace(/\?$/, "");
  } catch {
    return url;
  }
}

export async function fetchJobRoom(): Promise<Job[]> {
  const ads = new Map<string, JobRoomAd>();

  for (const keyword of JOBROOM_KEYWORDS) {
    process.stdout.write(`  ${keyword} … `);
    let total = 0;
    for (let page = 0; page < 8; page++) {
      if (page > 0) await Bun.sleep(250);
      const res = await fetch(`${JOBROOM_API}?page=${page}&size=100`, {
        method: "POST",
        headers: { ...HEADERS, "Content-Type": "application/json", Accept: "application/json" },
        body: JSON.stringify({
          onlineSince: 30,
          displayRestricted: false,
          keywords: [keyword],
          cantonCodes: JOBROOM_CANTONS,
          workloadPercentageMin: 0,
          workloadPercentageMax: 100,
        }),
      });
      if (!res.ok) { console.log(`failed (${res.status})`); break; }

      const hits = (await res.json()) as Array<{ jobAdvertisement?: JobRoomAd }>;
      for (const h of hits) {
        if (h.jobAdvertisement?.id) ads.set(h.jobAdvertisement.id, h.jobAdvertisement);
      }
      total += hits.length;
      if (hits.length < 100) break;
    }
    console.log(`${total} ads (${ads.size} unique)`);
    await Bun.sleep(250);
  }

  const jobs: Job[] = [];
  let langDropped = 0;
  for (const ad of ads.values()) {
    const content = ad.jobContent;
    const desc = content?.jobDescriptions?.[0];
    if (!desc) continue;

    // Strip the <em> highlighting the search API wraps around matched terms.
    const title = decodeHtml(desc.title.replace(/<[^>]+>/g, ""));
    if (!applyFilters(title)) continue;
    if (MS_STACK_RE.test(title)) continue;
    if (PHARMA_ROLE_RE.test(title)) continue;

    // A handful of ads ship without a description. isEnglishDescription passes
    // those through by design, so leave contentChecked unset and let index.ts
    // fall back to fetching the page.
    const body = desc.description ?? "";
    const hasBody = body.trim().length > 40;
    if (hasBody && !isEnglishDescription(body)) { langDropped++; continue; }

    const city = content?.location?.city ?? content?.company?.city ?? "";
    const canton = content?.location?.cantonCode ?? "";

    jobs.push({
      id: `jr-${ad.id}`,
      title,
      company: content?.company?.name ?? "",
      location: [city, canton].filter(Boolean).join(", ") || "Switzerland",
      postedAt: ad.createdTime?.slice(0, 10) ?? "",
      link: content?.externalUrl
        ? stripTracking(content.externalUrl)
        : `https://www.job-room.ch/job-search/${ad.id}`,
      search: "job-room.ch",
      source: "job-room.ch",
      contentChecked: hasBody, // only skip the re-check when we really judged a description
    });
  }

  console.log(`  ${ads.size} ads scanned, ${jobs.length} kept, ${langDropped} non-English`);
  return jobs;
}

// International organisations in the Basel region (BIS, Swiss TPH, Basel
// Institute on Governance). Each board carries only a handful of postings, so
// they're swept together under one label rather than one entry apiece.
//
// These are mission-driven employers whose tech roles use UN-flavoured titles
// ("Information Management Officer", "ICT Specialist") that SOFTWARE_TITLE_RE
// alone would drop, so INTL_TECH_RE widens the net for these boards only.
// Boards this small can afford the extra noise; missing a rare opening can't.
const INTL_TECH_RE =
  /\b(information\s*(management|systems?|technology)|ict\b|digital|geospatial|\bmis\b|data\s*(management|steward))\b/i;

function applyIntlFilters(title: string): boolean {
  if (NON_ENGLISH_RE.test(title)) return false;
  if (JUNIOR_TITLE_RE.test(title)) return false;
  if (MS_STACK_RE.test(title)) return false;
  return SOFTWARE_TITLE_RE.test(title) || INTL_TECH_RE.test(title);
}

// BIS runs a JS-rendered career site with no usable API, so we read the UNjobs
// mirror of its Basel office instead. Titles arrive as "Role, City, Country".
async function fetchBis(): Promise<Job[]> {
  const jobs: Job[] = [];
  const res = await fetch(
    "https://unjobs.org/offices/bis_182320855689338880",
    { headers: HEADERS }
  );
  if (!res.ok) { console.log(`  BIS … failed (${res.status})`); return jobs; }

  const html = await res.text();
  const cards = [...html.matchAll(
    /<a[^>]+href="(https:\/\/unjobs\.org\/vacancies\/(\d+))"[\s\S]*?<span\s+class="jtitle">([^<]+)<\/span>([\s\S]*?)<\/a>/g
  )];

  let kept = 0;
  for (const [, link, id, rawTitle, rest] of cards) {
    // "Senior Platform Engineer, Basel, Switzerland" → title + location
    const split = decodeHtml(rawTitle).match(/^(.*?),\s*([^,]+,\s*[^,]+)$/);
    const title = split ? split[1] : decodeHtml(rawTitle);
    const location = split ? split[2] : "Basel, Switzerland";
    if (!applyIntlFilters(title)) continue;

    jobs.push({
      id: `bis-${id}`,
      title,
      company: "Bank for International Settlements",
      location,
      postedAt: rest.match(/datetime="(\d{4}-\d{2}-\d{2})/)?.[1] ?? "",
      link,
      search: "bis.org",
      source: "bis.org",
      contentChecked: true, // BIS publishes in English only
    });
    kept++;
  }

  console.log(`  BIS … ${cards.length} ads, ${kept} kept`);
  return jobs;
}

// Swiss TPH runs Umantis. Site chrome is German even on English postings, so
// isEnglishUrl would reject the lot — the title filters decide instead.
async function fetchSwissTph(): Promise<Job[]> {
  const jobs: Job[] = [];
  const res = await fetch("https://jobs.swisstph.ch/Jobs/All", { headers: HEADERS });
  if (!res.ok) { console.log(`  Swiss TPH … failed (${res.status})`); return jobs; }

  const html = await res.text();
  // One block per posting, opened by the subtitle link that carries the title.
  const blocks = html.split(/(?=<a\s[^>]*class="HSTableLinkSubTitle")/).slice(1);

  let kept = 0;
  for (const block of blocks) {
    const hrefM = block.match(/href="(\/Vacancies\/(\d+)\/Description\/\d+)"/);
    const titleM = block.match(/class="HSTableLinkSubTitle"[^>]*>([^<]+)</);
    if (!hrefM || !titleM) continue;

    const title = decodeHtml(titleM[1]);
    if (!applyIntlFilters(title)) continue;

    // "Online seit" label and its value sit in separate spans sharing an id suffix.
    const dateM = block.match(/Online seit<\/span>[\s\S]{0,300}?>\s*(\d{2})\.(\d{2})\.(\d{4})/);
    const locM = block.match(/>\s*Schweiz\s*-\s*([^<]+)</);

    jobs.push({
      id: `tph-${hrefM[2]}`,
      title,
      company: "Swiss TPH",
      location: locM ? `${locM[1].trim()}, Switzerland` : "Allschwil, Switzerland",
      postedAt: dateM ? `${dateM[3]}-${dateM[2]}-${dateM[1]}` : "",
      link: `https://jobs.swisstph.ch${hrefM[1]}`,
      search: "swisstph.ch",
      source: "swisstph.ch",
      contentChecked: true, // German site chrome would fail the page-level check
    });
    kept++;
  }

  console.log(`  Swiss TPH … ${blocks.length} ads, ${kept} kept`);
  return jobs;
}

// Basel Institute on Governance publishes each vacancy as a linked PDF, so
// there is no HTML description to language-check downstream.
async function fetchBaselGovernance(): Promise<Job[]> {
  const jobs: Job[] = [];
  const res = await fetch("https://baselgovernance.org/about/careers", { headers: HEADERS });
  if (!res.ok) { console.log(`  Basel Governance … failed (${res.status})`); return jobs; }

  const html = await res.text();
  // The `rounded-3xl` card class is what separates vacancy tiles from other
  // asset links on the page (the annual report PDF sits in a plain anchor).
  const cards = [...html.matchAll(
    /<a\s+href="(https:\/\/baselgovernance\.org\/cms\/api\/assets\/([^\/]+)\/[^"]+)"[^>]*class="[^"]*rounded-3xl[^"]*"[\s\S]{0,400}?<h2[^>]*>([^<]+)<\/h2>([\s\S]{0,900})/g
  )];

  let kept = 0;
  for (const [, link, assetId, rawTitle, rest] of cards) {
    const title = decodeHtml(rawTitle);
    if (!applyIntlFilters(title)) continue;

    const locM = rest.match(/map-pin[\s\S]{0,200}?<\/span>\s*([^<]+)</);

    jobs.push({
      id: `big-${assetId}`,
      title,
      company: "Basel Institute on Governance",
      location: locM ? decodeHtml(locM[1]) : "Basel, Switzerland",
      postedAt: "", // board shows the closing date only
      link,
      search: "baselgovernance.org",
      source: "baselgovernance.org",
      contentChecked: true, // postings are PDFs, and the institute publishes in English
    });
    kept++;
  }

  console.log(`  Basel Governance … ${cards.length} ads, ${kept} kept`);
  return jobs;
}

export async function fetchBaselIntlOrgs(): Promise<Job[]> {
  const jobs: Job[] = [];
  for (const fetchOrg of [fetchBis, fetchSwissTph, fetchBaselGovernance]) {
    try {
      jobs.push(...(await fetchOrg()));
    } catch (e) {
      console.log(`  error: ${e}`);
    }
    await Bun.sleep(400);
  }
  return jobs;
}

// stellen-basel.ch — WordPress REST API
export async function fetchStellenBasel(): Promise<Job[]> {
  const allJobs: Job[] = [];
  const seen = new Set<string>();

  for (let page = 1; page <= 30; page++) {
    if (page > 1) await Bun.sleep(400);
    process.stdout.write(`  page ${page} … `);

    const res = await fetch(
      `https://www.stellen-basel.ch/wp-json/wp/v2/job-listings?per_page=100&page=${page}&_fields=id,title,date,link,meta`,
      { headers: { ...HEADERS, Accept: "application/json" } }
    );
    if (!res.ok) { console.log("done"); break; }

    const data = (await res.json()) as Array<{
      id: number;
      title: { rendered: string };
      date: string;
      link: string;
      meta: { _company_name?: string; _job_location?: string };
    }>;

    if (!data.length) { console.log("0 items"); break; }

    let newOnPage = 0;
    for (const item of data) {
      const title = decodeHtml(item.title.rendered);
      if (!applyFilters(title)) continue;

      const id = `sb-${item.id}`;
      if (seen.has(id)) continue;
      seen.add(id);

      allJobs.push({
        id,
        title,
        company: item.meta._company_name ?? "",
        location: item.meta._job_location ?? "Basel",
        postedAt: item.date.slice(0, 10),
        link: item.link,
        search: "stellen-basel.ch",
        source: "stellen-basel.ch",
      });
      newOnPage++;
    }

    console.log(`${data.length} items, ${newOnPage} new`);
    if (data.length < 100) break;
  }

  return allJobs;
}