"use client";

import Link from "next/link";
import { useEffect, useState } from "react";

import { browserFetch } from "../lib/api";

type FavoriteMaker = {
  id: string;
  slug: string;
  business_name: string;
  city: string | null;
  province: string | null;
  main_image_url: string | null;
  availability: string | null;
  avg_rating: number | string;
  review_count: number;
};

type FavoriteWork = {
  id: string;
  slug: string;
  title: string;
  summary: string;
  technology: string;
  material: string;
  image_url: string;
  maker_slug: string;
  maker_name: string;
};

type FavoritesResponse = {
  makers: FavoriteMaker[];
  works: FavoriteWork[];
};

function rating(value: number | string) {
  const parsed = typeof value === "number" ? value : Number(value);
  return Number.isFinite(parsed) ? parsed.toFixed(1) : "0.0";
}

export default function FavoritesClient() {
  const [activeTab, setActiveTab] = useState<"makers" | "works">("makers");
  const [favorites, setFavorites] = useState<FavoritesResponse>({ makers: [], works: [] });
  const [loading, setLoading] = useState(true);
  const [needsLogin, setNeedsLogin] = useState(false);
  const [status, setStatus] = useState("");

  async function loadFavorites() {
    setStatus("");
    try {
      const response = await browserFetch<FavoritesResponse>("/favorites");
      setFavorites(response);
      setNeedsLogin(false);
    } catch (error) {
      const message = error instanceof Error ? error.message : "";
      if (message.includes("Authentication")) {
        setNeedsLogin(true);
        return;
      }
      setStatus("No se pudieron cargar tus favoritos.");
    } finally {
      setLoading(false);
    }
  }

  useEffect(() => {
    void loadFavorites();
  }, []);

  async function removeFavorite(type: "maker" | "work", id: string) {
    const endpoint = type === "maker" ? `/favorites/makers/${id}` : `/favorites/works/${id}`;
    await browserFetch(endpoint, { method: "DELETE" });
    await loadFavorites();
  }

  if (loading) {
    return (
      <section className="favorites-shell">
        <div className="profile-account-card stack">
          <span className="eyebrow">Favoritos</span>
          <h1 className="section-title">Cargando guardados</h1>
          <p className="muted">Estamos preparando tus makers y trabajos favoritos.</p>
        </div>
      </section>
    );
  }

  if (needsLogin) {
    return (
      <section className="favorites-shell">
        <div className="profile-account-card stack">
          <span className="eyebrow">Favoritos</span>
          <h1 className="section-title">Inicia sesion para guardar favoritos</h1>
          <p className="muted">Tus makers y trabajos guardados quedan asociados a tu cuenta para recuperarlos desde cualquier pestana.</p>
          <Link href="/login?returnTo=%2Ffavorites" className="button button-primary">Entrar</Link>
        </div>
      </section>
    );
  }

  const visibleMakers = activeTab === "makers";
  const empty = visibleMakers ? favorites.makers.length === 0 : favorites.works.length === 0;

  return (
    <section className="favorites-shell">
      <div className="favorites-header">
        <div>
          <span className="eyebrow">Favoritos</span>
          <h1 className="section-title">Guardados para volver rapido</h1>
          <p className="muted">Separados por makers y trabajos para que puedas comparar proveedores o ejemplos concretos.</p>
        </div>
        <div className="favorites-counts">
          <span>{favorites.makers.length} makers</span>
          <span>{favorites.works.length} trabajos</span>
        </div>
      </div>

      <div className="favorites-tabs" role="tablist" aria-label="Secciones de favoritos">
        <button className={activeTab === "makers" ? "is-active" : ""} type="button" onClick={() => setActiveTab("makers")}>
          Makers
        </button>
        <button className={activeTab === "works" ? "is-active" : ""} type="button" onClick={() => setActiveTab("works")}>
          Trabajos
        </button>
      </div>

      {status ? <p className="messages-status">{status}</p> : null}

      {empty ? (
        <div className="profile-account-card stack">
          <h2 className="section-title">{visibleMakers ? "Todavia no guardaste makers" : "Todavia no guardaste trabajos"}</h2>
          <p className="muted">Usa el boton Guardar desde un perfil de maker o desde el detalle de un trabajo.</p>
          <Link href="/discover" className="button button-primary">Descubrir makers</Link>
        </div>
      ) : null}

      {visibleMakers ? (
        <div className="favorites-grid">
          {favorites.makers.map((maker) => (
            <article key={maker.id} className="favorite-card">
              <img className="thumb" src={maker.main_image_url || "/demo/maker-hero-1.svg"} alt={maker.business_name} />
              <div className="favorite-card-body">
                <div>
                  <strong>{maker.business_name}</strong>
                  <span className="mini-note">{maker.city || "Cordoba"}, {maker.province || "Argentina"}</span>
                </div>
                <div className="badges">
                  <span className="badge">Rating {rating(maker.avg_rating)}</span>
                  <span className="badge">{maker.review_count} resenas</span>
                  <span className="badge">{maker.availability || "available"}</span>
                </div>
                <div className="favorite-card-actions">
                  <Link href={`/makers/${maker.slug}`} className="button button-primary">Ver perfil</Link>
                  <button className="button button-secondary" type="button" onClick={() => removeFavorite("maker", maker.id)}>Quitar</button>
                </div>
              </div>
            </article>
          ))}
        </div>
      ) : (
        <div className="favorites-grid">
          {favorites.works.map((work) => (
            <article key={work.id} className="favorite-card">
              <img className="thumb" src={work.image_url || "/demo/work-custom.svg"} alt={work.title} />
              <div className="favorite-card-body">
                <div>
                  <strong>{work.title}</strong>
                  <span className="mini-note">{work.maker_name}</span>
                </div>
                <p className="muted">{work.summary}</p>
                <div className="badges">
                  <span className="badge">{work.technology}</span>
                  <span className="badge">{work.material}</span>
                </div>
                <div className="favorite-card-actions">
                  <Link href={`/works/${work.slug}`} className="button button-primary">Ver trabajo</Link>
                  <button className="button button-secondary" type="button" onClick={() => removeFavorite("work", work.id)}>Quitar</button>
                </div>
              </div>
            </article>
          ))}
        </div>
      )}
    </section>
  );
}