"use client";

import { motion } from "motion/react";
import Image from "next/image";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { useEffect } from "react";
import { SofaLogo } from "@/components/sofa-logo";
import { useSession } from "@/lib/auth/client";

/** Check whether the server has TMDB configured. */
async function fetchSetupStatus(): Promise<boolean> {
  try {
    const res = await fetch("/api/setup/status");
    if (!res.ok) return true; // assume configured on error
    const data = await res.json();
    return !!data.tmdbConfigured;
  } catch {
    return true;
  }
}

// Poster positions arranged in angled columns behind the hero
const posterLayout = [
  // Left column
  { x: "8%", y: "5%", rotate: -8, delay: 0 },
  { x: "5%", y: "38%", rotate: -12, delay: 0.1 },
  { x: "10%", y: "68%", rotate: -6, delay: 0.2 },
  // Left-center column
  { x: "24%", y: "12%", rotate: 4, delay: 0.05 },
  { x: "22%", y: "50%", rotate: -3, delay: 0.15 },
  { x: "26%", y: "78%", rotate: 6, delay: 0.25 },
  // Right-center column
  { x: "62%", y: "8%", rotate: -5, delay: 0.08 },
  { x: "64%", y: "42%", rotate: 7, delay: 0.18 },
  { x: "60%", y: "72%", rotate: -4, delay: 0.28 },
  // Right column
  { x: "80%", y: "3%", rotate: 10, delay: 0.03 },
  { x: "82%", y: "36%", rotate: -8, delay: 0.13 },
  { x: "78%", y: "66%", rotate: 5, delay: 0.23 },
];

export function LandingPage({
  posterUrls,
  freshInstall,
  registrationOpen,
}: {
  posterUrls: string[];
  freshInstall: boolean;
  registrationOpen: boolean;
}) {
  const { data: session, isPending } = useSession();
  const router = useRouter();

  useEffect(() => {
    if (isPending) return;
    if (session?.user) {
      router.replace("/dashboard");
      return;
    }
    // If not logged in, check whether TMDB is configured
    fetchSetupStatus().then((configured) => {
      if (!configured) router.replace("/setup");
    });
  }, [session, isPending, router]);

  if (isPending) return null;

  return (
    <div className="relative flex min-h-screen flex-col items-center justify-center overflow-hidden">
      {/* Background grain texture */}
      <div
        className="pointer-events-none absolute inset-0 opacity-[0.03]"
        style={{
          backgroundImage: `url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E")`,
        }}
      />

      {/* Floating poster collage */}
      <div className="pointer-events-none absolute inset-0 hidden overflow-hidden sm:block">
        {posterUrls.map((url, i) => {
          const pos = posterLayout[i];
          return (
            <motion.div
              key={url}
              className="absolute w-28 md:w-32 lg:w-36"
              style={{ left: pos.x, top: pos.y }}
              initial={{ opacity: 0, scale: 0.8, rotate: pos.rotate }}
              animate={{ opacity: 0.12, scale: 1, rotate: pos.rotate }}
              transition={{
                type: "spring" as const,
                stiffness: 100,
                damping: 20,
                delay: 0.4 + pos.delay,
              }}
            >
              <div className="overflow-hidden rounded-xl shadow-lg">
                <Image
                  src={url}
                  alt=""
                  width={300}
                  height={450}
                  className="h-auto w-full"
                />
              </div>
            </motion.div>
          );
        })}
      </div>

      {/* Radial fade over posters to keep center clear */}
      <div className="pointer-events-none absolute inset-0 bg-[radial-gradient(ellipse_at_center,_var(--tw-gradient-stops))] from-background via-background/95 to-background/40" />

      {/* Warm primary glow */}
      <motion.div
        className="pointer-events-none absolute left-1/2 top-1/3 h-[600px] w-[600px] -translate-x-1/2 -translate-y-1/2 rounded-full bg-primary/5 blur-[120px]"
        animate={{ opacity: [0.4, 0.7, 0.4] }}
        transition={{
          duration: 6,
          repeat: Number.POSITIVE_INFINITY,
          ease: "easeInOut",
        }}
      />

      <main className="relative z-10 flex flex-col items-center gap-10 px-6 text-center">
        <div className="space-y-4">
          <motion.p
            className="text-sm font-medium uppercase tracking-[0.3em] text-primary"
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{
              type: "spring" as const,
              stiffness: 200,
              damping: 20,
            }}
          >
            Self-hosted movie & TV tracker
          </motion.p>
          <motion.div
            className="flex justify-center text-primary"
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{
              type: "spring" as const,
              stiffness: 200,
              damping: 20,
              delay: 0.1,
            }}
          >
            <SofaLogo className="size-24 sm:size-28 md:size-32" />
          </motion.div>
          <motion.p
            className="mx-auto max-w-md text-lg leading-relaxed text-muted-foreground"
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{
              type: "spring" as const,
              stiffness: 200,
              damping: 20,
              delay: 0.2,
            }}
          >
            Track what you watch. Know what&apos;s next.
            <br />
            Your library, your data, your rules.
          </motion.p>
        </div>

        <motion.div
          className="flex gap-4"
          initial={{ opacity: 0, y: 20 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{
            type: "spring" as const,
            stiffness: 200,
            damping: 20,
            delay: 0.35,
          }}
        >
          {freshInstall ? (
            <Link
              href="/register"
              className="group relative inline-flex h-12 items-center justify-center overflow-hidden rounded-lg bg-primary px-8 font-medium text-primary-foreground transition-all hover:shadow-lg hover:shadow-primary/20"
            >
              <span className="relative z-10">Get Started</span>
              <div className="absolute inset-0 bg-gradient-to-t from-black/10 to-transparent opacity-0 transition-opacity group-hover:opacity-100" />
            </Link>
          ) : (
            <>
              <Link
                href="/login"
                className="group relative inline-flex h-12 items-center justify-center overflow-hidden rounded-lg bg-primary px-8 font-medium text-primary-foreground transition-all hover:shadow-lg hover:shadow-primary/20"
              >
                <span className="relative z-10">Sign In</span>
                <div className="absolute inset-0 bg-gradient-to-t from-black/10 to-transparent opacity-0 transition-opacity group-hover:opacity-100" />
              </Link>
              {registrationOpen && (
                <Link
                  href="/register"
                  className="inline-flex h-12 items-center justify-center rounded-lg border border-border px-8 font-medium transition-all hover:border-primary/40 hover:bg-primary/5"
                >
                  Register
                </Link>
              )}
            </>
          )}
        </motion.div>
      </main>

      {/* Bottom fade */}
      <div className="pointer-events-none absolute bottom-0 left-0 right-0 h-32 bg-gradient-to-t from-background to-transparent" />
    </div>
  );
}