/**
 * Ride detail + history endpoint.
 *
 *   GET /api/parks/:parkId/rides/:slug
 *        Returns ride metadata, today's per-sample series, and 7d + 30d
 *        per-day aggregates in a single round-trip.
 *
 * The frontend renders Today / 7d / 30d tabs from one payload — no
 * client-side fetching of additional ranges. Cache: 60s public.
 */

import { Hono } from "hono";
import { PARK_MAP } from "../../../lib/parks";
import {
  getDayData,
  getRideBySlug,
  getRideSamplesForDay,
  getRideDailyAggregates,
  countRideDays,
  type DailySample,
  type DailyAggregate,
} from "../db/queries";
import { liveRidesCache, fastLaneCache } from "../services/live-cache";
import { slugifyRideName } from "../../../lib/ride-slug";
import { lookupFastLane } from "../../../lib/scrapers/sixflags-waittimes";
import { getTodayLocal, isWithinOperatingWindow } from "../../../lib/env";

const app = new Hono();

function formatLocalDate(d: Date, tz: string): string {
  return new Intl.DateTimeFormat("en-CA", {
    timeZone: tz,
    year: "numeric",
    month: "2-digit",
    day: "2-digit",
  }).format(d);
}

/** YYYY-MM-DD `n` days before the given local date (calendar-day math). */
function daysAgoIso(localDate: string, n: number): string {
  const [y, m, d] = localDate.split("-").map(Number);
  const date = new Date(Date.UTC(y, m - 1, d));
  date.setUTCDate(date.getUTCDate() - n);
  return date.toISOString().slice(0, 10);
}

app.get("/:parkId/rides/:slug", (c) => {
  const parkId = c.req.param("parkId");
  const slug = c.req.param("slug");

  const park = PARK_MAP.get(parkId);
  if (!park) return c.json({ error: "Park not found" }, 404);

  const ride = getRideBySlug(parkId, slug);
  if (!ride) {
    return c.json({ error: "Ride not found or no history yet" }, 404);
  }

  const now = new Date();
  const todayLocal = formatLocalDate(now, park.timezone);
  const since7d = daysAgoIso(todayLocal, 6);   // last 7 calendar days inclusive
  const since30d = daysAgoIso(todayLocal, 29); // last 30 calendar days inclusive

  const today: DailySample[] = getRideSamplesForDay(parkId, ride.qtRideId, todayLocal);
  const last7d: DailyAggregate[] = getRideDailyAggregates(parkId, ride.qtRideId, since7d);
  const last30d: DailyAggregate[] = getRideDailyAggregates(parkId, ride.qtRideId, since30d);
  const daysWith7d = countRideDays(parkId, ride.qtRideId, since7d);
  const daysWith30d = countRideDays(parkId, ride.qtRideId, since30d);

  // Best-effort current live state from the shared cache (no upstream fetch
  // — the cache is warmed by Tier-5 every 5 min and by the /rides route).
  const liveRides = liveRidesCache.get(parkId);
  const liveMatch = liveRides?.rides.find((r) => slugifyRideName(r.name) === slug) ?? null;
  const fastLaneCacheEntry = fastLaneCache.get(parkId);
  const flMatch = liveMatch && fastLaneCacheEntry ? lookupFastLane(liveMatch.name, fastLaneCacheEntry) : null;

  // Operating-window gate. Queue-Times keeps reporting yesterday's last wait
  // with isOpen=true overnight, so we override to closed when we're outside
  // the park's hours — same behaviour as the /rides route.
  const todayData = getDayData(parkId, getTodayLocal());
  const withinWindow = todayData?.hoursLabel
    ? isWithinOperatingWindow(todayData.hoursLabel, park.timezone)
    : false;
  const liveIsOpen = Boolean(liveMatch?.isOpen) && withinWindow;

  c.header("Cache-Control", "public, max-age=60, stale-while-revalidate=120");
  return c.json({
    park: {
      id: park.id,
      name: park.name,
      shortName: park.shortName,
      timezone: park.timezone,
    },
    ride: {
      qtRideId: ride.qtRideId,
      slug: ride.slug,
      name: ride.name,
      isCoaster: ride.isCoaster,
      hasFastLane: ride.hasFastLane,
      firstSeen: ride.firstSeen,
      lastSeen: ride.lastSeen,
    },
    live: liveMatch
      ? {
          isOpen: liveIsOpen,
          // Prefer Six Flags' regular wait when fresh — QT lags around open.
          waitMinutes: liveIsOpen
            ? (flMatch?.regularMinutes ?? liveMatch.waitMinutes)
            : 0,
          hasFastLane: Boolean(flMatch?.hasFastLane),
          fastLaneMinutes: liveIsOpen ? (flMatch?.fastLaneMinutes ?? null) : null,
          lastUpdated: liveMatch.lastUpdated,
        }
      : null,
    todayLocal,
    today,
    last7d,
    last30d,
    coverage: {
      daysWith7d,
      daysWith30d,
      todaySampleCount: today.length,
    },
  });
});

export default app;