/**
 * park-meta.json — persisted alongside the SQLite DB in data/
 *
 * This file stores per-park metadata that doesn't belong in the schedule DB:
 *   - rcdb_id: user-supplied RCDB park ID (fills into https://rcdb.com/{id}.htm)
 *   - coasters: list of operating roller coaster names scraped from RCDB
 *   - coasters_scraped_at: ISO timestamp of last RCDB scrape
 *
 * discover.ts: ensures every park has a skeleton entry (rcdb_id null by default)
 * scrape.ts:   populates coasters[] for parks with a known rcdb_id (30-day staleness)
 */

import fs from "fs";
import path from "path";

const META_PATH = path.join(process.cwd(), "data", "park-meta.json");

export interface ParkMeta {
  /** RCDB park page ID — user fills this in manually after discover creates the skeleton */
  rcdb_id: number | null;
  /** Operating roller coaster names scraped from RCDB */
  coasters: string[];
  /** ISO timestamp of when coasters was last scraped from RCDB */
  coasters_scraped_at: string | null;
}

export type ParkMetaMap = Record<string, ParkMeta>;

export function readParkMeta(): ParkMetaMap {
  try {
    return JSON.parse(fs.readFileSync(META_PATH, "utf8")) as ParkMetaMap;
  } catch {
    return {};
  }
}

export function writeParkMeta(meta: ParkMetaMap): void {
  fs.mkdirSync(path.dirname(META_PATH), { recursive: true });
  fs.writeFileSync(META_PATH, JSON.stringify(meta, null, 2) + "\n");
}

/** Default skeleton entry for a park that has never been configured. */
export function defaultParkMeta(): ParkMeta {
  return { rcdb_id: null, coasters: [], coasters_scraped_at: null };
}

const COASTER_STALE_MS = 30 * 24 * 60 * 60 * 1000; // 30 days

/** Returns true when the coaster list needs to be re-scraped from RCDB. */
export function areCoastersStale(entry: ParkMeta): boolean {
  if (!entry.coasters_scraped_at) return true;
  return Date.now() - new Date(entry.coasters_scraped_at).getTime() > COASTER_STALE_MS;
}

/**
 * Normalize a ride name for fuzzy matching between data sources.
 *
 * Queue-Times uses branded names (BATMAN™ The Ride, THE JOKER™ Funhouse Coaster)
 * while RCDB uses clean names (Batman The Ride, Joker Funhouse Coaster).
 *
 * Normalization steps:
 *   1. Strip trademark/copyright symbols (™ ® ©)
 *   2. Strip leading "THE " / "THE" prefix
 *   3. Replace punctuation (- : ' ") with spaces
 *   4. Collapse runs of whitespace
 *   5. Lowercase and trim
 */
export function normalizeRideName(name: string): string {
  return name
    .replace(/[™®©]/g, "")
    .replace(/^the\s+/i, "")
    .replace(/[-:'".]/g, " ")
    .replace(/\s+/g, " ")
    .toLowerCase()
    .trim();
}

/**
 * Returns a Set of normalized coaster names for fast membership checks.
 * Returns null when no coaster data exists for the park.
 */
export function getCoasterSet(parkId: string, meta: ParkMetaMap): Set<string> | null {
  const entry = meta[parkId];
  if (!entry || entry.coasters.length === 0) return null;
  return new Set(entry.coasters.map(normalizeRideName));
}