"use client";

import { useState, useMemo, useRef } from "react";
import { usePathname } from "next/navigation";
import Header from "@/components/Header";
import Footer from "@/components/Footer";
import PageHero from "@/components/PageHero";
import Link from "next/link";
import * as glossarioPt from "@/lib/glossarioData";
import * as glossarioEn from "@/lib/data/en/glossario";
import * as glossarioEs from "@/lib/data/es/glossario";
import * as glossarioFr from "@/lib/data/fr/glossario";
import * as glossarioDe from "@/lib/data/de/glossario";
import { getLocalizedHref } from "@/i18n/links";
import {
	ArrowRight,
	BookOpen,
	Check,
	Code2,
	Cpu,
	Database,
	HelpCircle,
	LayoutGrid,
	Lightbulb,
	Link2,
	BatteryCharging,
	RotateCcw,
	Search,
	ShieldCheck,
	Sliders,
	Sparkles,
	Wifi,
	X,
} from "lucide-react";

const BUSCAS_POPULARES = ["GPIO", "ULP", "PSRAM", "Strapping Pins", "Deep Sleep", "OTA", "Matter", "Secure Boot", "Wi-Fi 6", "MIPI"];

const ICONES = { Cpu, Database, Wifi, Sliders, Sparkles, BatteryCharging, Code2, ShieldCheck };

/** "Processamento, CPU & Silício" vira "Processamento": cabe no filtro sem truncar. */
const nomeCurto = (nome) => nome.split(/,| &/)[0].trim();

export default function GlossarioPage() {
	const pathname = usePathname();
	const isEn = pathname?.startsWith("/en");
	const isEs = pathname?.startsWith("/es");
	const isFr = pathname?.startsWith("/fr");
	const isDe = pathname?.startsWith("/de");
	const currentLocale = isDe ? "de" : isFr ? "fr" : isEs ? "es" : isEn ? "en" : "pt";
	const { categoriasGlossario } = isDe ? glossarioDe : isFr ? glossarioFr : isEs ? glossarioEs : isEn ? glossarioEn : glossarioPt;

	const [busca, setBusca] = useState("");
	const [categoriaSelecionada, setCategoriaSelecionada] = useState("todas");
	const [letraFiltro, setLetraFiltro] = useState(null);
	const [copiadoSlug, setCopiadoSlug] = useState(null);
	const searchInputRef = useRef(null);

	const todosOsTermos = useMemo(
		() =>
			categoriasGlossario.flatMap((cat) =>
				cat.termos.map((t) => ({
					...t,
					categoriaId: cat.id,
					categoriaNome: cat.nome,
					categoriaIcone: cat.icone,
					slug: t.termo.toLowerCase().replace(/[\s()/²]+/g, "-"),
					primeiraLetra: t.termo.charAt(0).toUpperCase(),
				}))
			),
		[categoriasGlossario]
	);

	const alfabeto = useMemo(() => {
		const disponiveis = new Set(todosOsTermos.map((t) => t.primeiraLetra));
		return "ABCDEFGHIJKLMNOPQRSTUVWXYZ".split("").map((letra) => ({ letra, temTermos: disponiveis.has(letra) }));
	}, [todosOsTermos]);

	const termosFiltrados = useMemo(() => {
		const termoBusca = busca.toLowerCase().trim();
		return todosOsTermos.filter((item) => {
			const matchCategoria = categoriaSelecionada === "todas" || item.categoriaId === categoriaSelecionada;
			const matchLetra = !letraFiltro || item.primeiraLetra === letraFiltro;
			const matchBusca =
				!termoBusca ||
				item.termo.toLowerCase().includes(termoBusca) ||
				item.definicao.toLowerCase().includes(termoBusca) ||
				item.exemplo.toLowerCase().includes(termoBusca) ||
				item.categoriaNome.toLowerCase().includes(termoBusca);
			return matchCategoria && matchLetra && matchBusca;
		});
	}, [todosOsTermos, categoriaSelecionada, letraFiltro, busca]);

	const temFiltroAtivo = busca.trim() !== "" || categoriaSelecionada !== "todas" || letraFiltro !== null;

	const limparTodosFiltros = () => {
		setBusca("");
		setCategoriaSelecionada("todas");
		setLetraFiltro(null);
		searchInputRef.current?.focus();
	};

	const copiarLinkTermo = (slug) => {
		const basePath = getLocalizedHref("/glossario", currentLocale);
		navigator.clipboard.writeText(`${window.location.origin}${basePath}#${slug}`);
		setCopiadoSlug(slug);
		setTimeout(() => setCopiadoSlug(null), 2000);
	};

	const total = termosFiltrados.length;

	return (
		<div className="site-canvas min-h-screen">
			<Header />

			<main id="conteudo">
				<PageHero
					isEn={isEn}
					isEs={isEs}
					isFr={isFr}
					isDe={isDe}
					trail={[{ label: isDe ? "Glossar" : isFr ? "Glossaire" : isEs ? "Glosario" : isEn ? "Glossary" : "Glossário" }]}
					icon={BookOpen}
					label={
						isDe
							? `${todosOsTermos.length} Begriffe erklärt`
							: isFr
							? `${todosOsTermos.length} termes expliqués`
							: isEs
							? `${todosOsTermos.length} términos explicados`
							: isEn
							? `${todosOsTermos.length} terms explained`
							: `${todosOsTermos.length} termos explicados`
					}
					title={
						isDe
							? "Technisches Glossar für ESP32"
							: isFr
							? "Glossaire technique ESP32"
							: isEs
							? "Glosario técnico de ESP32"
							: isEn
							? "ESP32 Technical Glossary"
							: "Glossário técnico do ESP32"
					}
					lede={
						isDe
							? "Präzise Definitionen, Hardware-Parameter und praktische Beispiele für jeden Begriff des Ökosystems – von ADC bis Secure Boot."
							: isFr
							? "Définitions précises, paramètres matériels et exemples pratiques pour chaque terme de l'écosystème, de l'ADC au Secure Boot."
							: isEs
							? "Definiciones directas, parámetros de hardware y un ejemplo práctico para cada término del ecosistema, desde ADC hasta Secure Boot."
							: isEn
							? "Direct definitions, hardware parameters, and practical examples for every ecosystem term, from ADC to Secure Boot."
							: "Definições diretas, parâmetros de hardware e um exemplo prático para cada termo do ecossistema, de ADC a Secure Boot."
					}
				/>

				<section className="shell pt-10 sm:pt-12" aria-label={isDe ? "Suche und Filter" : isFr ? "Recherche et filtres" : isEs ? "Búsqueda y filtros" : isEn ? "Search and filters" : "Busca e filtros"}>
					<div className="panel p-5 sm:p-7">
						<div className="relative">
							<label htmlFor="busca-glossario" className="sr-only">
								{isDe ? "Nach Begriff, Abkürzung oder Konzept suchen" : isFr ? "Rechercher un terme, un sigle ou un concept" : isEs ? "Buscar término, sigla o concepto" : isEn ? "Search term, acronym, or concept" : "Buscar termo, sigla ou conceito"}
							</label>
							<Search className="pointer-events-none absolute left-4 top-1/2 h-5 w-5 -translate-y-1/2 text-muted" aria-hidden="true" />
							<input
								id="busca-glossario"
								ref={searchInputRef}
								type="search"
								value={busca}
								onChange={(e) => setBusca(e.target.value)}
								placeholder={isDe ? "Nach Begriff, Abkürzung oder Konzept suchen" : isFr ? "Rechercher un terme, un sigle ou un concept" : isEs ? "Buscar término, sigla o concepto" : isEn ? "Search term, acronym, or concept" : "Buscar termo, sigla ou conceito"}
								autoComplete="off"
								className={`field pl-12 text-base ${busca ? "pr-28" : "pr-4"}`}
							/>
							<div className="absolute right-2 top-1/2 -translate-y-1/2">
								{busca && (
									<button type="button" onClick={() => { setBusca(""); searchInputRef.current?.focus(); }} className="btn btn-ghost btn-sm">
										<X className="h-3.5 w-3.5" aria-hidden="true" />
										{isDe ? "Löschen" : isFr ? "Effacer" : isEs ? "Limpiar" : isEn ? "Clear" : "Limpar"}
									</button>
								)}
							</div>
						</div>

						<div className="mt-4 flex flex-wrap items-center gap-2">
							<span className="mr-1 text-sm text-muted">{isDe ? "Häufig gesucht" : isFr ? "Plus recherchés" : isEs ? "Más buscados" : isEn ? "Popular searches" : "Mais buscados"}</span>
							{BUSCAS_POPULARES.map((rotulo) => (
								<button
									key={rotulo}
									type="button"
									onClick={() => { setBusca(rotulo); setCategoriaSelecionada("todas"); setLetraFiltro(null); }}
									className="chip-btn"
								>
									{rotulo}
								</button>
							))}
						</div>

						<div className="mt-5 border-t border-line pt-5">
							<h2 className="text-sm font-semibold text-ink">{isDe ? "Kategorie" : isFr ? "Catégorie" : isEs ? "Categoría" : isEn ? "Category" : "Categoria"}</h2>
							<div className="mt-3 flex flex-wrap gap-2">
								<button
									type="button"
									onClick={() => setCategoriaSelecionada("todas")}
									aria-pressed={categoriaSelecionada === "todas"}
									className="chip-btn"
								>
									<LayoutGrid className="h-4 w-4" aria-hidden="true" />
									{isDe ? "Alle" : isFr ? "Toutes" : isEs ? "Todas" : isEn ? "All" : "Todas"}
									<span className="tabular-nums opacity-80">{todosOsTermos.length}</span>
								</button>
								{categoriasGlossario.map((cat) => {
									const Icone = ICONES[cat.icone] ?? Cpu;
									return (
										<button
											key={cat.id}
											type="button"
											onClick={() => setCategoriaSelecionada(cat.id)}
											aria-pressed={categoriaSelecionada === cat.id}
											className="chip-btn"
										>
											<Icone className="h-4 w-4" aria-hidden="true" />
											{nomeCurto(cat.nome)}
											<span className="tabular-nums opacity-80">{cat.termos.length}</span>
										</button>
									);
								})}
							</div>
						</div>

						<div className="mt-6 border-t border-line pt-6">
							<h2 className="text-sm font-semibold text-ink">{isDe ? "Alphabetische Reihenfolge" : isFr ? "Ordre alphabétique" : isEs ? "Orden alfabético" : isEn ? "Alphabetical order" : "Ordem alfabética"}</h2>
							<div className="mt-3 flex flex-wrap gap-1.5" role="group" aria-label={isDe ? "Nach Anfangsbuchstaben filtern" : isFr ? "Filtrer par lettre initiale" : isEs ? "Filtrar por letra inicial" : isEn ? "Filter by first letter" : "Filtrar pela letra inicial"}>
								<button type="button" onClick={() => setLetraFiltro(null)} aria-pressed={letraFiltro === null} className="chip-btn">
									{isDe ? "Alle" : isFr ? "Toutes" : isEs ? "Todas" : isEn ? "All" : "Todas"}
								</button>
								{alfabeto.map(({ letra, temTermos }) => (
									<button
										key={letra}
										type="button"
										disabled={!temTermos}
										onClick={() => setLetraFiltro(letraFiltro === letra ? null : letra)}
										aria-pressed={letraFiltro === letra}
										className="chip-btn min-w-[2.25rem] justify-center text-xs"
									>
										{letra}
									</button>
								))}
							</div>
						</div>
					</div>
				</section>

				<section className="shell section pt-8 sm:pt-10" aria-labelledby="resultado-titulo">
					<div className="flex flex-wrap items-center justify-between gap-3">
						<h2 id="resultado-titulo" className="text-base font-semibold text-ink" role="status" aria-live="polite">
							{total}{" "}
							{total === 1
								? isDe
									? "Begriff"
									: isFr
									? "terme"
									: isEs
									? "término"
									: isEn
									? "term"
									: "termo"
								: isDe
								? "Begriffe"
								: isFr
								? "termes"
								: isEs
								? "términos"
								: isEn
								? "terms"
								: "termos"}
							{temFiltroAtivo && (
								<span className="font-normal text-muted">
									{isDe
										? " mit den aktuellen Filtern"
										: isFr
										? " avec les filtres actuels"
										: isEs
										? " con los filtros actuales"
										: isEn
										? " with current filters"
										: " com os filtros atuais"}
								</span>
							)}
						</h2>
						{temFiltroAtivo && (
							<button type="button" onClick={limparTodosFiltros} className="inline-flex min-h-11 items-center gap-1.5 text-sm font-medium text-accent hover:text-accent-strong">
								<RotateCcw className="h-4 w-4" aria-hidden="true" />
								{isDe ? "Filter zurücksetzen" : isFr ? "Réinitialiser les filtres" : isEs ? "Restablecer filtros" : isEn ? "Reset filters" : "Redefinir filtros"}
							</button>
						)}
					</div>

					{total === 0 ? (
						<div className="card mt-6 px-6 py-14 text-center">
							<HelpCircle className="mx-auto h-10 w-10 text-muted" aria-hidden="true" />
							<h3 className="mt-4 font-display text-xl font-semibold text-ink">
								{isDe ? "Keine Begriffe gefunden" : isFr ? "Aucun terme trouvé" : isEs ? "No se encontraron términos" : isEn ? "No terms found" : "Nenhum termo encontrado"}
							</h3>
							<p className="mx-auto mt-2 max-w-md text-sm text-muted">
								{isDe
									? "Nichts entspricht Ihrer aktuellen Suche und den Filtern. Versuchen Sie eine kürzere Abkürzung oder wählen Sie alle Kategorien."
									: isFr
									? "Rien ne correspond à votre recherche et à vos filtres actuels. Essayez avec un sigle plus court ou revenez à toutes les catégories."
									: isEs
									? "Nada coincide con la búsqueda y los filtros actuales. Pruebe con una sigla más corta o vuelva a todas las categorías."
									: isEn
									? "Nothing matches your current search and filters. Try a shorter acronym or reset to all categories."
									: "Nada combina com a busca e os filtros atuais. Tente uma sigla mais curta ou volte para todas as categorias."}
							</p>
							<button type="button" onClick={limparTodosFiltros} className="btn btn-primary mt-6">
								<RotateCcw className="h-4 w-4" aria-hidden="true" />
								{isDe ? "Filter zurücksetzen" : isFr ? "Réinitialiser les filtres" : isEs ? "Limpiar filtros" : isEn ? "Clear filters" : "Limpar filtros"}
							</button>
						</div>
					) : (
						<div className="mt-6 grid gap-4 md:grid-cols-2">
							{termosFiltrados.map((item) => {
								const Icone = ICONES[item.categoriaIcone] ?? Cpu;
								return (
									<article key={item.slug} id={item.slug} className="card flex scroll-mt-28 flex-col p-5 sm:p-6">
										<div className="flex items-center justify-between gap-3">
											<span className="chip">
												<Icone className="h-3.5 w-3.5 text-accent" aria-hidden="true" />
												{nomeCurto(item.categoriaNome)}
											</span>
											<button
												type="button"
												onClick={() => copiarLinkTermo(item.slug)}
												aria-label={
													isDe
														? `Link für ${item.termo} kopieren`
														: isFr
														? `Copier le lien pour ${item.termo}`
														: isEs
														? `Copiar enlace para ${item.termo}`
														: isEn
														? `Copy link for ${item.termo}`
														: `Copiar link para ${item.termo}`
												}
												className="btn-icon inline-flex h-11 w-11 items-center justify-center rounded-full text-muted transition-colors hover:bg-surface-2 hover:text-accent"
											>
												{copiadoSlug === item.slug ? <Check className="h-4 w-4 text-ok" aria-hidden="true" /> : <Link2 className="h-4 w-4" aria-hidden="true" />}
											</button>
										</div>

										<h3 className="mt-3 font-display text-xl font-semibold tracking-[-0.03em] text-ink">{item.termo}</h3>
										<p className="mt-2 text-[0.9375rem] leading-relaxed text-muted">
											<TextoComLinks texto={item.definicao} currentLocale={currentLocale} />
										</p>

										<div className="callout mt-5">
											<p className="flex items-center gap-1.5 text-sm font-semibold text-ink">
												<Lightbulb className="h-4 w-4 text-accent" aria-hidden="true" />
												{isDe ? "In der Praxis" : isFr ? "En pratique" : isEs ? "En la práctica" : isEn ? "In practice" : "Na prática"}
											</p>
											<p className="mt-1">
												<TextoComLinks texto={item.exemplo} currentLocale={currentLocale} />
											</p>
										</div>
									</article>
								);
							})}
						</div>
					)}
				</section>

				<section className="shell pb-20 md:pb-28">
					<div className="panel p-8 text-center sm:p-12">
						<h2 className="section-title mx-auto max-w-2xl">
							{isDe ? "Vom Konzept zum richtigen Chip." : isFr ? "Du concept à la bonne puce." : isEs ? "Del concepto al chip adecuado." : isEn ? "From concept to the right chip." : "Do conceito ao chip certo."}
						</h2>
						<p className="lede mx-auto mt-4 max-w-2xl">
							{isDe
								? "Mit den Begriffen zur Hand vergleichen Sie die Serien Seite an Seite oder nutzen Sie die Auswahlhilfe, um das Modell für Ihr Projekt zu finden."
								: isFr
								? "Avec les termes sous la main, comparez les séries côte à côte ou répondez au sélecteur pour trouver le modèle adapté à votre projet."
								: isEs
								? "Con los términos a mano, compare las series lado a lado o responda al selector para encontrar el modelo que se adapta a su proyecto."
								: isEn
								? "With the terms in hand, compare series side by side or answer the selector to find the model that fits your project."
								: "Com os termos em mãos, compare as séries lado a lado ou responda ao seletor para chegar ao modelo que cabe no seu projeto."}
						</p>
						<div className="mt-8 flex flex-col items-center justify-center gap-3 sm:flex-row">
							<Link href={getLocalizedHref("/seletor", currentLocale)} className="btn btn-primary w-full sm:w-auto">
								<Sliders className="h-4 w-4" aria-hidden="true" />
								{isDe ? "Meinen Chip wählen" : isFr ? "Choisir ma puce" : isEs ? "Elegir mi chip" : isEn ? "Choose my chip" : "Escolher meu chip"}
							</Link>
							<Link href={getLocalizedHref("/series", currentLocale)} className="btn btn-ghost w-full sm:w-auto">
								{isDe ? "Serien erkunden" : isFr ? "Explorer les séries" : isEs ? "Explorar las series" : isEn ? "Explore series" : "Explorar as séries"}
								<ArrowRight className="h-4 w-4" aria-hidden="true" />
							</Link>
						</div>
					</div>
				</section>
			</main>

			<Footer />
		</div>
	);
}

/**
 * Função utilitária que detecta nomes de séries do ESP32 dentro do texto e os converte em links clicáveis.
 */
function TextoComLinks({ texto, currentLocale = "pt" }) {
	if (!texto) return null;
	const seriesKeys = [
		"ESP32-S31",
		"ESP32-C61",
		"ESP32-S2",
		"ESP32-S3",
		"ESP32-C2",
		"ESP32-C3",
		"ESP32-C5",
		"ESP32-C6",
		"ESP32-P4",
		"ESP32-H2",
		"ESP32-H4",
		"ESP32",
	];
	const regex = new RegExp(`\\b(${seriesKeys.join("|")})\\b`, "g");
	const partes = texto.split(regex);

	return (
		<>
			{partes.map((parte, i) => {
				if (seriesKeys.includes(parte)) {
					return (
						<Link
							key={i}
							href={getLocalizedHref(`/series/${parte}`, currentLocale)}
							className="font-semibold text-accent underline decoration-accent/30 underline-offset-2 hover:decoration-accent"
						>
							{parte}
						</Link>
					);
				}
				return parte;
			})}
		</>
	);
}