/**
 * Debug a specific park + date to inspect raw API data and parsed output.
 *
 * Usage:
 *   npm run debug -- --park greatadventure --date 2026-07-04
 *
 * Output is printed to the terminal and saved to debug/{parkId}_{date}.txt
 */

import fs from "fs";
import path from "path";
import { openDb, getApiId } from "../lib/db";
import { PARKS } from "../lib/parks";
import { scrapeMonthRaw } from "../lib/scrapers/sixflags";

function arg(flag: string): string | undefined {
  const i = process.argv.indexOf(flag);
  return i !== -1 ? process.argv[i + 1] : undefined;
}

function fmt24(time: string): string {
  const [h, m] = time.split(":").map(Number);
  const period = h >= 12 ? "pm" : "am";
  const h12 = h % 12 || 12;
  return m === 0 ? `${h12}${period}` : `${h12}:${String(m).padStart(2, "0")}${period}`;
}

async function main() {
  const parkId = arg("--park");
  const dateStr = arg("--date");

  if (!parkId || !dateStr) {
    console.error("Usage: npm run debug -- --park <parkId> --date <YYYY-MM-DD>");
    console.error("\nAvailable park IDs:");
    for (const p of PARKS) console.error(`  ${p.id.padEnd(24)} ${p.name}`);
    process.exit(1);
  }

  const park = PARKS.find((p) => p.id === parkId);
  if (!park) {
    console.error(`Unknown park: "${parkId}"`);
    process.exit(1);
  }

  const match = dateStr.match(/^(\d{4})-(\d{2})-(\d{2})$/);
  if (!match) {
    console.error(`Invalid date: "${dateStr}" — expected YYYY-MM-DD`);
    process.exit(1);
  }
  const [, yearStr, monthStr, dayStr] = match;
  const year = parseInt(yearStr);
  const month = parseInt(monthStr);
  const day = parseInt(dayStr);

  const db = openDb();
  const apiId = getApiId(db, park.id);
  db.close();

  if (apiId === null) {
    console.error(`No API ID found for ${park.name} — run: npm run discover`);
    process.exit(1);
  }

  // Collect all output so we can write it to a file as well
  const lines: string[] = [];
  const out = (...args: string[]) => {
    const line = args.join(" ");
    lines.push(line);
    console.log(line);
  };

  out(`Park    : ${park.name} (${park.id})`);
  out(`API ID  : ${apiId}`);
  out(`Date    : ${dateStr}`);
  out(`Fetched : ${new Date().toISOString()}`);
  out("");
  out(`Fetching ${year}-${String(month).padStart(2, "0")} from API...`);

  const raw = await scrapeMonthRaw(apiId, year, month);

  const targetDate = `${String(month).padStart(2, "0")}/${String(day).padStart(2, "0")}/${year}`;
  const dayData = raw.dates.find((d) => d.date === targetDate);

  if (!dayData) {
    console.error(`Date ${dateStr} not found in API response.`);
    console.error(`Dates returned by API: ${raw.dates.map((d) => d.date).join(", ")}`);
    process.exit(1);
  }

  // ── Raw API response ───────────────────────────────────────────────────────
  out("");
  out("── Raw API response ─────────────────────────────────────────");
  out(JSON.stringify(dayData, null, 2));

  // ── Parsed result ──────────────────────────────────────────────────────────
  const operating =
    dayData.operatings?.find((o) => o.operatingTypeName === "Park") ??
    dayData.operatings?.[0];
  const item = operating?.items?.[0];
  const hoursLabel =
    item?.timeFrom && item?.timeTo
      ? `${fmt24(item.timeFrom)} – ${fmt24(item.timeTo)}`
      : undefined;
  const isOpen = !dayData.isParkClosed && hoursLabel !== undefined;

  out("");
  out("── Parsed result ────────────────────────────────────────────");
  out(`  isParkClosed : ${dayData.isParkClosed}`);
  out(`  operatings   : ${dayData.operatings?.length ?? 0} entr${dayData.operatings?.length === 1 ? "y" : "ies"}`);
  if (operating) {
    out(`  selected     : "${operating.operatingTypeName}" (${operating.items?.length ?? 0} item(s))`);
    if (item) {
      out(`  timeFrom     : ${item.timeFrom}  →  ${fmt24(item.timeFrom)}`);
      out(`  timeTo       : ${item.timeTo}  →  ${fmt24(item.timeTo)}`);
    }
  }
  out(`  hoursLabel   : ${hoursLabel ?? "(none)"}`);
  out(`  isOpen       : ${isOpen}`);

  // ── Write to file ──────────────────────────────────────────────────────────
  const debugDir = path.join(process.cwd(), "debug");
  fs.mkdirSync(debugDir, { recursive: true });
  const outPath = path.join(debugDir, `${parkId}_${dateStr}.txt`);
  fs.writeFileSync(outPath, lines.join("\n") + "\n");
  console.log(`\nSaved to debug/${parkId}_${dateStr}.txt`);
}

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