import { BackToCalendarLink } from "@/components/BackToCalendarLink";
import { notFound } from "next/navigation";
import { PARK_MAP } from "@/lib/parks";
import { ParkMonthCalendar } from "@/components/ParkMonthCalendar";
import { LiveRidePanel } from "@/components/LiveRidePanel";
import type { RideStatus, RidesFetchResult } from "@/lib/scrapers/sixflags";
import type { LiveRidesResult } from "@/lib/scrapers/queuetimes";
import { getTodayLocal } from "@/lib/env";

const BACKEND_URL = process.env.BACKEND_URL ?? "http://localhost:3001";

interface PageProps {
  params: Promise<{ id: string }>;
  searchParams: Promise<{ month?: string }>;
}

function parseMonthParam(param: string | undefined): string {
  if (param && /^\d{4}-\d{2}$/.test(param)) {
    const [y, m] = param.split("-").map(Number);
    if (y >= 2020 && y <= 2030 && m >= 1 && m <= 12) {
      return param;
    }
  }
  return getTodayLocal().slice(0, 7);
}

export default async function ParkPage({ params, searchParams }: PageProps) {
  const { id } = await params;
  const { month: monthParam } = await searchParams;

  const park = PARK_MAP.get(id);
  if (!park) notFound();

  const monthStr = parseMonthParam(monthParam);
  const [year, month] = monthStr.split("-").map(Number);

  const [calendarData, ridesData] = await Promise.all([
    fetch(`${BACKEND_URL}/api/calendar/${id}/month?month=${monthStr}`, {
      next: { revalidate: 300 },
    }).then((r) => r.json()),
    fetch(`${BACKEND_URL}/api/parks/${id}/rides`, {
      next: { revalidate: 60 },
    }).then((r) => r.json()),
  ]);

  const { monthData, today } = calendarData;
  const {
    parkOpenToday,
    isWeatherDelay,
    liveRides,
    scheduleFallback: ridesResult,
  }: {
    parkOpenToday: boolean;
    isWeatherDelay: boolean;
    liveRides: LiveRidesResult | null;
    scheduleFallback: RidesFetchResult | null;
  } = ridesData;

  return (
    <div style={{ minHeight: "100vh", background: "var(--color-bg)" }}>
      {/* ── Header ─────────────────────────────────────────────────────────── */}
      <header style={{
        position: "sticky",
        top: 0,
        zIndex: 20,
        background: "var(--color-bg)",
        borderBottom: "1px solid var(--color-border)",
        padding: "12px 24px",
        display: "flex",
        alignItems: "center",
        gap: 16,
      }}>
        <BackToCalendarLink />
        <div style={{ width: 1, height: 16, background: "var(--color-border)" }} />
        <span style={{ fontSize: "0.9rem", fontWeight: 600, color: "var(--color-text)", letterSpacing: "-0.01em" }}>
          {park.name}
        </span>
        <span style={{ fontSize: "0.75rem", color: "var(--color-text-muted)" }}>
          {park.location.city}, {park.location.state}
        </span>
      </header>

      <main style={{ padding: "24px 32px", maxWidth: 1280, margin: "0 auto", display: "flex", flexDirection: "column", gap: 40 }}>

        {/* ── Month Calendar ───────────────────────────────────────────────── */}
        <section>
          <ParkMonthCalendar
            parkId={id}
            year={year}
            month={month}
            monthData={monthData}
            today={today}
            timezone={park.timezone}
          />
        </section>

        {/* ── Ride Status ─────────────────────────────────────────────────── */}
        <section>
          <SectionHeading aside={liveRides ? (
            <span style={{ display: "flex", alignItems: "center", gap: 6, flexWrap: "wrap", justifyContent: "flex-end" }}>
              <a
                href="https://queue-times.com"
                target="_blank"
                rel="noopener noreferrer"
                style={{
                  fontSize: "0.68rem",
                  color: "var(--color-text-dim)",
                  textDecoration: "none",
                  display: "flex",
                  alignItems: "center",
                  gap: 4,
                  transition: "color 120ms ease",
                }}
                className="park-name-link"
              >
                via queue-times.com
              </a>
              {liveRides.rides.some((r) => r.hasFastLane) && (
                <span style={{ fontSize: "0.68rem", color: "var(--color-text-dim)" }}>
                  · Fast Lane via sixflags.com
                </span>
              )}
            </span>
          ) : undefined}>
            Rides
            {liveRides ? (
              <LiveBadge />
            ) : ridesResult && !ridesResult.isExact ? (
              <span style={{ fontSize: "0.72rem", fontWeight: 400, color: "var(--color-text-muted)", marginLeft: 8 }}>
                {formatShortDate(ridesResult.dataDate)}
              </span>
            ) : (
              <span style={{ fontSize: "0.72rem", fontWeight: 400, color: "var(--color-text-muted)", marginLeft: 8 }}>
                Today
              </span>
            )}
          </SectionHeading>

          {liveRides ? (
            <LiveRidePanel
              parkId={id}
              liveRides={liveRides}
              parkOpenToday={parkOpenToday}
              isWeatherDelay={isWeatherDelay}
            />
          ) : (
            <RideList
              ridesResult={ridesResult}
              parkOpenToday={parkOpenToday}
            />
          )}
        </section>
      </main>
    </div>
  );
}

// ── Helpers ────────────────────────────────────────────────────────────────

function formatShortDate(iso: string): string {
  return new Date(iso + "T00:00:00").toLocaleDateString("en-US", {
    weekday: "short", month: "short", day: "numeric",
  });
}

// ── Sub-components ─────────────────────────────────────────────────────────

function SectionHeading({ children, aside }: { children: React.ReactNode; aside?: React.ReactNode }) {
  return (
    <div style={{
      display: "flex",
      alignItems: "center",
      justifyContent: "space-between",
      marginBottom: 14,
      paddingBottom: 10,
      borderBottom: "1px solid var(--color-border)",
    }}>
      <h2 style={{
        fontSize: "0.85rem",
        fontWeight: 700,
        color: "var(--color-text)",
        letterSpacing: "0.04em",
        textTransform: "uppercase",
        margin: 0,
        display: "flex",
        alignItems: "center",
      }}>
        {children}
      </h2>
      {aside}
    </div>
  );
}

function LiveBadge() {
  return (
    <span style={{
      display: "inline-flex",
      alignItems: "center",
      gap: 5,
      marginLeft: 10,
      padding: "2px 8px",
      borderRadius: 20,
      background: "var(--color-open-bg)",
      border: "1px solid var(--color-open-border)",
      fontSize: "0.65rem",
      fontWeight: 700,
      letterSpacing: "0.06em",
      textTransform: "uppercase",
      color: "var(--color-open-text)",
      verticalAlign: "middle",
    }}>
      <span style={{
        width: 5,
        height: 5,
        borderRadius: "50%",
        background: "var(--color-open-text)",
        display: "inline-block",
      }} />
      Live
    </span>
  );
}

// ── Schedule ride list (Six Flags operating-hours API fallback) ────────────

function RideList({
  ridesResult,
  parkOpenToday,
}: {
  ridesResult: RidesFetchResult | null;
  parkOpenToday: boolean;
}) {
  if (!parkOpenToday) {
    return <Callout>Park is closed today — no ride schedule available.</Callout>;
  }

  if (!ridesResult || ridesResult.rides.length === 0) {
    return <Callout>Ride schedule is not yet available from the API.</Callout>;
  }

  const { rides, isExact, dataDate, parkHoursLabel } = ridesResult;
  const openRides = rides.filter((r) => r.isOpen);
  const closedRides = rides.filter((r) => !r.isOpen);

  return (
    <div>
      {/* Summary badge row */}
      <div style={{ display: "flex", alignItems: "center", gap: 12, marginBottom: 16, flexWrap: "wrap" }}>
        <div style={{
          background: "var(--color-open-bg)",
          border: "1px solid var(--color-open-border)",
          borderRadius: 20,
          padding: "4px 12px",
          fontSize: "0.72rem",
          fontWeight: 600,
          color: "var(--color-open-hours)",
        }}>
          {openRides.length} open
        </div>
        {closedRides.length > 0 && (
          <div style={{
            background: "var(--color-surface)",
            border: "1px solid var(--color-border)",
            borderRadius: 20,
            padding: "4px 12px",
            fontSize: "0.72rem",
            fontWeight: 500,
            color: "var(--color-text-muted)",
          }}>
            {closedRides.length} closed / unscheduled
          </div>
        )}
        {!isExact && (
          <span style={{ fontSize: "0.7rem", color: "var(--color-text-dim)" }}>
            Showing {formatShortDate(dataDate)} — live schedule updates daily
          </span>
        )}
      </div>

      {/* Two-column grid */}
      <div style={{
        display: "grid",
        gridTemplateColumns: "repeat(auto-fill, minmax(280px, 1fr))",
        gap: 6,
      }}>
        {openRides.map((ride) => <RideRow key={ride.name} ride={ride} parkHoursLabel={parkHoursLabel} />)}
        {closedRides.map((ride) => <RideRow key={ride.name} ride={ride} parkHoursLabel={parkHoursLabel} />)}
      </div>
    </div>
  );
}

function RideRow({ ride, parkHoursLabel }: { ride: RideStatus; parkHoursLabel?: string }) {
  const showHours = ride.isOpen && ride.hoursLabel && ride.hoursLabel !== parkHoursLabel;

  return (
    <div style={{
      display: "flex",
      alignItems: "center",
      justifyContent: "space-between",
      gap: 10,
      padding: "8px 12px",
      background: "var(--color-surface)",
      border: `1px solid ${ride.isOpen ? "var(--color-open-border)" : "var(--color-border)"}`,
      borderRadius: 8,
      opacity: ride.isOpen ? 1 : 0.6,
    }}>
      <div style={{ display: "flex", alignItems: "center", gap: 8, minWidth: 0 }}>
        <span style={{
          width: 7,
          height: 7,
          borderRadius: "50%",
          background: ride.isOpen ? "var(--color-open-text)" : "var(--color-text-dim)",
          flexShrink: 0,
        }} />
        <span title={ride.name} style={{
          fontSize: "0.8rem",
          color: ride.isOpen ? "var(--color-text)" : "var(--color-text-muted)",
          fontWeight: ride.isOpen ? 500 : 400,
          overflow: "hidden",
          textOverflow: "ellipsis",
          whiteSpace: "nowrap",
        }}>
          {ride.name}
        </span>
      </div>
      {showHours && (
        <span style={{
          fontSize: "0.72rem",
          color: "var(--color-open-hours)",
          fontWeight: 500,
          flexShrink: 0,
          whiteSpace: "nowrap",
        }}>
          {ride.hoursLabel}
        </span>
      )}
    </div>
  );
}

function Callout({ children }: { children: React.ReactNode }) {
  return (
    <div style={{
      padding: "14px 18px",
      background: "var(--color-surface)",
      border: "1px solid var(--color-border)",
      borderRadius: 8,
      fontSize: "0.82rem",
      color: "var(--color-text-muted)",
      lineHeight: 1.5,
    }}>
      {children}
    </div>
  );
}