import type { Parser, ExtractedRecord, RawDocument } from "@dci/connectors";
import { countryFromText, cleanText } from "@dci/core";
import { loadHtml, tableRows, txt, resolvePlace, regionRecord, type Place } from "./shared.js";

/**
 * IBM Cloud — https://cloud.ibm.com/docs/overview?topic=overview-locations (server-rendered docs):
 *   "Multizone regions" / "Single-campus MZRs" tables: Region ("Dallas (us-south)") | Zone ("us-south-1 us-south-2 us-south-3").
 *   Later tables (fault domains, zone mapping, classic data centers) are ignored for regions.
 */
export const ibmRegionsParser: Parser = {
  name: "cloud_ibm_regions_v1",
  version: "1.0.0",
  pageTypes: ["cloud_region"],
  parse(doc: RawDocument, ctx): ExtractedRecord[] {
    const $ = loadHtml(doc);
    const out: ExtractedRecord[] = [];
    const seen = new Set<string>();
    $("table").each((_, table) => {
      const rows = tableRows($, $(table));
      const header = rows[0] ?? [];
      if (header.length !== 2 || !/^Region$/i.test(header[0] ?? "") || !/^Zone/i.test(header[1] ?? "")) return;
      // find the nearest preceding h2/h3 for the MZR type
      const heading = txt($(table).prevAll("h2,h3").first()) || txt($(table).parent().prevAll("h2,h3").first());
      const kind = /single-campus/i.test(heading) ? "single_campus_mzr" : "mzr";
      for (const row of rows.slice(1)) {
        const m = row[0]!.match(/^(.*?)\s*\(\s*([a-z]{2}-[a-z]{2,4})\s*\)/);
        if (!m) continue;
        const code = m[2]!;
        if (seen.has(code)) continue;
        seen.add(code);
        const rawCity = cleanText(m[1]!) ?? m[1]!;
        const partner = rawCity.match(/-\s*(.+)$/)?.[1]?.trim() ?? null; // "Chennai - Airtel"
        const cityLabel = rawCity.replace(/\s*-\s*.+$/, "").trim();
        const zones = (row[1] ?? "").split(/\s+/).filter((z) => /^[a-z]{2}-[a-z]{2,4}-\d$/.test(z));
        let place: Place = resolvePlace(cityLabel);
        if (!place.countryIso2) place.countryIso2 = countryFromText(cityLabel);
        if (!place.city) place.city = cityLabel;
        const externalIds: Record<string, string | number> = { ibm_region: code, kind, ibm_zones: zones.join(","), published_location: rawCity };
        if (partner) externalIds.partner = partner;
        out.push(
          regionRecord({
            connectorId: ctx.connectorId,
            keyPrefix: "ibm:region",
            providerName: "IBM Cloud",
            code,
            name: `${cityLabel} (${code})`,
            place,
            availabilityZones: zones.length || null,
            status: "operational",
            externalIds,
            url: doc.finalUrl,
            methods: { code: "html:table.Region", availabilityZones: "count:zones", city: "curated-city-table" },
          }),
        );
      }
    });
    ctx.log("info", `ibm: ${out.length} regions`);
    return out;
  },
};