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

/**
 * Alibaba Cloud — https://www.alibabacloud.com/help/en/ecs/product-overview/regions-and-zones (static docs):
 *   table Region name | Region ID | Number of zones | Zone name | Zone ID   e.g. "Germany (Frankfurt)" | eu-central-1 | 3
 * Launch years come from https://www.alibabacloud.com/global-locations (static <li>: "Japan (Tokyo) Availability Zone: 5
 * Released in 2016"), joined on the region display name.
 */
const LOCATIONS_PAGE = "https://www.alibabacloud.com/global-locations";
const NAME_ISO: Array<[RegExp, string]> = [[/^China\b/i, "CN"], [/^SAU\b/i, "SA"], [/^UK\b/i, "GB"], [/^US\b/i, "US"], [/^UAE\b/i, "AE"], [/^Mexico\b/i, "MX"]];

async function releaseYears(ctx: ConnectorContext): Promise<Map<string, string>> {
  const cached = await ctx.getState<Record<string, string>>("alibaba:releaseYears");
  if (cached) return new Map(Object.entries(cached));
  const map = new Map<string, string>();
  const doc = await ctx.fetch(LOCATIONS_PAGE, { group: "regions" });
  if (doc.error || doc.status !== 200) { ctx.log("warn", `alibaba global-locations unavailable (${doc.error?.code ?? doc.status}); launch years left null`); return map; }
  const $ = loadHtml(doc);
  $("li.item").each((_, li) => {
    const t = txt($(li));
    const m = t.match(/^(.*?)\s*Availability Zone:\s*(\d+)\s*Released in\s*(\d{4})/i);
    if (m) map.set(normKey(m[1]!), m[3]!);
  });
  await ctx.setState("alibaba:releaseYears", Object.fromEntries(map));
  return map;
}

export const alibabaRegionsParser: Parser = {
  name: "cloud_alibaba_regions_v1",
  version: "1.0.0",
  pageTypes: ["cloud_region"],
  async parse(doc: RawDocument, ctx): Promise<ExtractedRecord[]> {
    const $ = loadHtml(doc);
    const years = await releaseYears(ctx);
    const out: ExtractedRecord[] = [];
    const seen = new Set<string>();
    for (const row of tableRows($, $("table"))) {
      if (row.length < 3) continue;
      const code = row[1]!.trim();
      if (!/^[a-z]{2}-[a-z0-9-]+$/.test(code) || seen.has(code)) continue;
      seen.add(code);
      const rawName = row[0]!;
      const closing = /closing down/i.test(rawName);
      const name = cleanText(rawName.replace(/closing down/i, "").replace(/\s*-\s*(Local|Partner) Region/i, "")) ?? rawName;
      const zones = Number.parseInt(row[2]!.replace(/[^\d]/g, ""), 10);
      const iso = NAME_ISO.find(([re]) => re.test(name))?.[1] ?? countryFromText(name.replace(/\(.*\)/, "")) ?? null;
      const label = parenthetical(rawName)?.replace(/\s*-\s*(Local|Partner) Region/i, "") ?? (iso === "SG" ? "Singapore" : null);
      const isoHint = label && /^hong kong$/i.test(label) ? "HK" : label && /^macau|macao$/i.test(label) ? "MO" : iso;
      const place: Place = resolvePlace(label, isoHint);
      if (!place.countryIso2) place.countryIso2 = isoHint ?? (label ? countryFromText(label) : null);
      const year = years.get(normKey(name)) ?? years.get(normKey(rawName.replace(/closing down/i, ""))) ?? null;
      const externalIds: Record<string, string | number> = { alibaba_region_id: code, kind: /local region/i.test(rawName) ? "local_region" : "region" };
      if (closing) externalIds.lifecycle = "closing_down";
      if (/partner region/i.test(rawName)) externalIds.operated_by = "partner";
      if (label) externalIds.published_location = label;
      out.push(
        regionRecord({
          connectorId: ctx.connectorId,
          keyPrefix: "alibaba:region",
          providerName: "Alibaba Cloud",
          code,
          name,
          place,
          availabilityZones: Number.isFinite(zones) && zones > 0 ? zones : null,
          launchedOn: year,
          status: "operational",
          externalIds,
          url: doc.finalUrl,
          methods: { code: "html:table.RegionID", name: "html:table.RegionName", availabilityZones: "html:table.NumberOfZones", launchedOn: year ? "html:global-locations.ReleasedIn" : "none", city: "curated-city-table" },
        }),
      );
    }
    ctx.log("info", `alibaba: ${out.length} regions (${[...years.keys()].length} launch years matched from global-locations)`);
    return out;
  },
};