"use client";

import { useEffect, useState } from "react";
import { SearchBar } from "@/components/SearchBar";
import { MovieHeader } from "@/components/MovieHeader";
import { MovieInsightPanel } from "@/components/MovieInsightPanel";
import type { TmdbMovieDetails, TmdbSearchResult } from "@/lib/tmdb";

export default function HomePage() {
  const [selectedMovie, setSelectedMovie] = useState<TmdbSearchResult | null>(
    null,
  );
  const [movieDetails, setMovieDetails] = useState<TmdbMovieDetails | null>(
    null,
  );
  const [isLoadingMovie, setIsLoadingMovie] = useState(false);
  const [movieError, setMovieError] = useState<string | null>(null);

  // Preload a random interesting movie on initial page load to demonstrate the app
  useEffect(() => {
    const DEMO_IDS = [27205, 157336, 155, 550, 496243, 424]; // Inception, Interstellar, Dark Knight, Fight Club, Parasite, Schindler's List
    const loadDemo = async () => {
      const id = DEMO_IDS[Math.floor(Math.random() * DEMO_IDS.length)];
      try {
        const res = await fetch(`/api/movie/${id}`);
        if (!res.ok) return;
        const details: TmdbMovieDetails = await res.json();
        const minimalSearch: TmdbSearchResult = {
          id: details.id,
          title: details.title,
          release_date: details.release_date || "",
          poster_path: details.poster_path,
          overview: details.overview || "",
        };
        setSelectedMovie(minimalSearch);
        setMovieDetails(details);
      } catch {
        // silently fall back to empty state if demo preload fails
      }
    };
    if (!selectedMovie) {
      void loadDemo();
    }
  }, []);

  const handleSelect = async (movie: TmdbSearchResult) => {
    setSelectedMovie(movie);
    setMovieDetails(null);
    setMovieError(null);
    setIsLoadingMovie(true);

    try {
      const res = await fetch(`/api/movie/${movie.id}`);
      if (!res.ok) {
        throw new Error("Failed to load movie details");
      }
      const details: TmdbMovieDetails = await res.json();
      setMovieDetails(details);
    } catch (err) {
      setMovieError(
        err instanceof Error ? err.message : "Failed to load movie details",
      );
    } finally {
      setIsLoadingMovie(false);
    }
  };

  const hasFullMovie = movieDetails != null;

  return (
    <>
      {/* Compact navbar: title + slogan on left, search on right */}
      <nav className="sticky top-0 z-50 border-b border-stone-200 bg-white">
        <div className="mx-auto flex h-14 max-w-6xl items-center justify-between gap-4 px-6">
          <div className="flex min-w-0 items-center gap-3">
            <span className="font-semibold tracking-tight text-stone-950">
              Film Intel
            </span>
            <span className="hidden truncate text-xs text-stone-500 sm:inline">
              Movie insight you won&apos;t find in one click
            </span>
          </div>

          <div className="w-full max-w-[320px]">
            <SearchBar
              autoFocus={!selectedMovie}
              onSelect={handleSelect}
              compact
            />
          </div>
        </div>
      </nav>

      <main className="mx-auto min-h-[calc(100vh-3.5rem)] w-full max-w-6xl px-6">
        {!selectedMovie && (
          <div className="flex flex-col items-center justify-center py-16 text-center">
            <p className="max-w-md text-sm text-stone-600">
              Search for any film using the bar above. We&apos;ll generate
              ratings explained, skip guides, sensitivity warnings, production
              facts, and more.
            </p>
          </div>
        )}

        {selectedMovie && (
          <div className="space-y-8 py-8">
            {hasFullMovie ? (
              <MovieHeader movie={movieDetails} showBack={false} />
            ) : (
              <div className="rounded-2xl border border-stone-200 bg-white p-6 shadow-sm">
                <div className="space-y-2">
                  <h2 className="text-2xl font-semibold text-stone-950">
                    {selectedMovie.title}
                    {selectedMovie.release_date ? (
                      <span className="ml-2 font-normal text-stone-500">
                        ({selectedMovie.release_date.slice(0, 4)})
                      </span>
                    ) : null}
                  </h2>
                  {selectedMovie.overview && (
                    <p className="text-sm leading-relaxed text-stone-600">
                      {selectedMovie.overview}
                    </p>
                  )}
                  {isLoadingMovie && (
                    <p className="text-sm text-amber-600">
                      Loading extended details...
                    </p>
                  )}
                  {movieError && (
                    <p className="text-sm text-red-600">
                      {movieError}. Card content will still load.
                    </p>
                  )}
                </div>
              </div>
            )}

            <MovieInsightPanel
              movieId={selectedMovie.id}
              genres={movieDetails?.genres.map((g) => g.name) ?? []}
            />
          </div>
        )}
      </main>

      <footer className="border-t border-stone-200 py-6 text-center text-xs text-stone-500">
        AI-generated content for informational purposes. Verify timestamps on
        your copy.
      </footer>
    </>
  );
}