/**
 * One-time discovery script — finds the CloudFront API ID for each park.
 *
 * Run this once before using scrape.ts:
 *   npx tsx scripts/discover.ts
 *
 * For each park in the registry it:
 *   1. Opens the park's hours page in a headless browser
 *   2. Intercepts all calls to the operating-hours CloudFront API
 *   3. Identifies the main theme park ID (filters out water parks, safari, etc.)
 *   4. Stores the ID in the database
 *
 * Re-running is safe — already-discovered parks are skipped.
 */

import { chromium } from "playwright";
import { openDb, getApiId, setApiId, type DbInstance } from "../lib/db";
import { PARKS } from "../lib/parks";
import { fetchParkInfo, isMainThemePark } from "../lib/scrapers/sixflags";

const CLOUDFRONT_PATTERN = /operating-hours\/park\/(\d+)/;

async function discoverParkId(slug: string): Promise<number | null> {
  const browser = await chromium.launch({ headless: true });
  try {
    const context = await browser.newContext({
      userAgent:
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 " +
        "(KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36",
      locale: "en-US",
    });
    const page = await context.newPage();

    const capturedIds = new Set<number>();
    page.on("request", (req) => {
      const match = req.url().match(CLOUDFRONT_PATTERN);
      if (match) capturedIds.add(parseInt(match[1]));
    });

    await page
      .goto(`https://www.sixflags.com/${slug}/park-hours?date=2026-05-01`, {
        waitUntil: "networkidle",
        timeout: 30_000,
      })
      .catch(() => null);

    await context.close();

    if (capturedIds.size === 0) return null;

    // Check each captured ID — pick the main theme park (not water park / safari)
    for (const id of capturedIds) {
      const info = await fetchParkInfo(id);
      if (info && isMainThemePark(info.parkName)) {
        console.log(
          `    → ID ${id} | ${info.parkAbbreviation} | ${info.parkName}`
        );
        return id;
      }
    }

    // Fallback: return the lowest ID (usually the main park)
    const fallback = Math.min(...capturedIds);
    console.log(`    → fallback to lowest ID: ${fallback}`);
    return fallback;
  } finally {
    await browser.close();
  }
}

function purgeRemovedParks(db: DbInstance) {
  const knownIds = new Set(PARKS.map((p) => p.id));

  const staleParkIds = (
    db.prepare("SELECT DISTINCT park_id FROM park_api_ids").all() as { park_id: string }[]
  )
    .map((r) => r.park_id)
    .filter((id) => !knownIds.has(id));

  if (staleParkIds.length === 0) return;

  console.log(`\nRemoving ${staleParkIds.length} park(s) no longer in registry:`);
  for (const parkId of staleParkIds) {
    const days = (
      db.prepare("SELECT COUNT(*) AS n FROM park_days WHERE park_id = ?").get(parkId) as { n: number }
    ).n;
    db.prepare("DELETE FROM park_days WHERE park_id = ?").run(parkId);
    db.prepare("DELETE FROM park_api_ids WHERE park_id = ?").run(parkId);
    console.log(`  removed ${parkId} (${days} day rows deleted)`);
  }
  console.log();
}

async function main() {
  const db = openDb();

  purgeRemovedParks(db);

  for (const park of PARKS) {
    const existing = getApiId(db, park.id);
    if (existing !== null) {
      console.log(`${park.name}: already known (API ID ${existing}) — skip`);
      continue;
    }

    process.stdout.write(`${park.name} (${park.slug})... `);

    try {
      const apiId = await discoverParkId(park.slug);
      if (apiId === null) {
        console.log("FAILED — no API IDs captured");
        continue;
      }

      // Fetch full info to store name/abbreviation
      const info = await fetchParkInfo(apiId);
      setApiId(db, park.id, apiId, info?.parkAbbreviation, info?.parkName);
      console.log(`done (ID ${apiId})`);
    } catch (err) {
      console.log(`ERROR: ${err}`);
    }

    // Small delay between parks to be polite
    await new Promise((r) => setTimeout(r, 2000));
  }

  // Print summary
  console.log("\n── Discovered IDs ──");
  for (const park of PARKS) {
    const id = getApiId(db, park.id);
    console.log(`  ${park.id.padEnd(30)} ${id ?? "NOT FOUND"}`);
  }

  db.close();
}

main().catch((err) => {
  console.error("Fatal:", err);
  process.exit(1);
});