"use client";

import Header from "@/components/Header";
import Footer from "@/components/Footer";
import PageHero from "@/components/PageHero";
import { useEffect, useState, Fragment } from "react";
import Link from "next/link";
import seriesData from "@/public/series.json";
import { ArrowRight, ArrowUpRight, Check, ChevronDown, Scale } from "lucide-react";

const MIN_SERIES = 2;
const MAX_SERIES = 4;

/* Lê "seguranca.ecc" além de chaves simples. */
function valorDe(objeto, caminho) {
	return caminho.split(".").reduce((atual, parte) => atual?.[parte], objeto);
}

export default function Comparacao() {
	const [selectedSeries, setSelectedSeries] = useState(["ESP32", "ESP32-S3"]);
	const [soDiferencas, setSoDiferencas] = useState(false);
	const [collapsedCategories, setCollapsedCategories] = useState({
		"Interfaces Especiais": true,
		"Especificações Ambientais": true,
	});

	const series = Object.entries(seriesData);

	// O seletor envia as séries finalistas em ?chips=ESP32-S3,ESP32-C6.
	useEffect(() => {
		const chips = new URLSearchParams(window.location.search).get("chips");
		if (!chips) return;
		const validas = [...new Set(chips.split(","))].filter((k) => seriesData[k]).slice(0, MAX_SERIES);
		if (validas.length >= MIN_SERIES) setSelectedSeries(validas);
	}, []);

	const toggleSeries = (seriesKey) => {
		if (selectedSeries.includes(seriesKey)) {
			if (selectedSeries.length > MIN_SERIES) setSelectedSeries(selectedSeries.filter((s) => s !== seriesKey));
		} else if (selectedSeries.length < MAX_SERIES) {
			setSelectedSeries([...selectedSeries, seriesKey]);
		}
	};

	const toggleCategory = (category) => {
		setCollapsedCategories({ ...collapsedCategories, [category]: !collapsedCategories[category] });
	};

	const compareFields = [
		{ category: "Geral", fields: [
			{ key: "nome_completo", label: "Nome Completo" },
			{ key: "descricao", label: "Descrição" },
		]},
		{ category: "Disponibilidade e Ferramentas", fields: [
			{ key: "esp_idf_minimo", label: "ESP-IDF mínimo" },
			{ key: "arduino_core", label: "Core Arduino" },
			{ key: "depuracao", label: "Depuração / JTAG" },
			{ key: "encapsulamento", label: "Encapsulamento" },
			{ key: "modulos", label: "Módulos disponíveis" },
		]},
		{ category: "Processador", fields: [
			{ key: "arquitetura", label: "Arquitetura" },
			{ key: "nucleos", label: "Núcleos" },
			{ key: "frequencia", label: "Frequência" },
			{ key: "coprocessador_ulp", label: "Coprocessador ULP" },
			{ key: "aceleradores_ia", label: "Aceleradores de IA" },
		]},
		{ category: "Conectividade", fields: [
			{ key: "wifi", label: "Wi-Fi" },
			{ key: "bluetooth", label: "Bluetooth" },
			{ key: "zigbee_thread", label: "Zigbee/Thread" },
			{ key: "matter", label: "Matter" },
			{ key: "ethernet", label: "Ethernet" },
		]},
		{ category: "Memória", fields: [
			{ key: "memoria_sram", label: "SRAM" },
			{ key: "memoria_sram_rtc", label: "SRAM RTC" },
			{ key: "memoria_rom", label: "ROM" },
			{ key: "flash_externa", label: "Flash Externa" },
			{ key: "psram_externa", label: "PSRAM Externa" },
		]},
		{ category: "Periféricos Digitais", fields: [
			{ key: "gpio", label: "GPIO" },
			{ key: "uart", label: "UART" },
			{ key: "spi", label: "SPI" },
			{ key: "i2c", label: "I²C" },
			{ key: "i2s", label: "I²S" },
			{ key: "pwm", label: "PWM" },
			{ key: "can", label: "CAN" },
			{ key: "usb", label: "USB" },
			{ key: "depuracao", label: "Depuração / JTAG" },
			{ key: "sdio", label: "SDIO" },
		]},
		{ category: "Periféricos Analógicos", fields: [
			{ key: "adc", label: "ADC" },
			{ key: "dac", label: "DAC" },
			{ key: "touch", label: "Touch Capacitivo" },
			{ key: "sensor_hall", label: "Sensor Hall" },
			{ key: "sensor_temperatura", label: "Sensor de Temperatura" },
		]},
		{ category: "Segurança", fields: [
			{ key: "seguranca.aes", label: "AES" },
			{ key: "seguranca.sha", label: "SHA" },
			{ key: "seguranca.rsa", label: "RSA / MPI" },
			{ key: "seguranca.ecc", label: "ECC (curvas elípticas)" },
			{ key: "seguranca.ecdsa", label: "ECDSA em hardware" },
			{ key: "seguranca.hmac", label: "HMAC" },
			{ key: "seguranca.assinatura_digital", label: "Assinatura Digital (DS)" },
			{ key: "seguranca.key_manager", label: "Key Manager" },
			{ key: "seguranca.rng", label: "Gerador aleatório (RNG)" },
			{ key: "seguranca.criptografia_flash", label: "Criptografia de flash" },
			{ key: "seguranca.secure_boot", label: "Secure Boot" },
			{ key: "seguranca.protecao_dpa", label: "Proteção contra DPA" },
		]},
		{ category: "Interfaces Especiais", fields: [
			{ key: "lcd", label: "LCD" },
			{ key: "camera", label: "Câmera" },
			{ key: "mipi_csi", label: "MIPI CSI" },
			{ key: "mipi_dsi", label: "MIPI DSI" },
			{ key: "ethernet_mac", label: "Ethernet MAC" },
		]},
		{ category: "Especificações Ambientais", fields: [
			{ key: "temperatura_operacao", label: "Temp. Operação" },
			{ key: "temperatura_armazenamento", label: "Temp. Armazenamento" },
		]},
	];

	const renderValue = (value) => {
		if (!value || value === "Não") return <span className="text-muted">Não</span>;
		if (value === "Sim") {
			return (
				<span className="inline-flex items-center gap-1.5 font-medium text-ok">
					<Check className="h-4 w-4" aria-hidden="true" />
					Sim
				</span>
			);
		}
		return <span className="font-medium text-ink">{value}</span>;
	};

	const valores = (key) => selectedSeries.map((k) => String(valorDe(seriesData[k], key) ?? "Não"));
	const diferem = (key) => new Set(valores(key)).size > 1;

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

			<main id="conteudo">
				<PageHero
					trail={[{ label: "Comparador" }]}
					icon={Scale}
					label="Até quatro séries lado a lado"
					title="Comparador de séries"
					lede="Coloque núcleos, rádio, memória, periféricos e segurança na mesma tabela e veja o que realmente muda de um chip para outro."
				/>

				<section className="shell pt-10 sm:pt-12" aria-labelledby="escolha-titulo">
					<div className="panel p-5 sm:p-7">
						<div className="flex flex-wrap items-end justify-between gap-3">
							<div>
								<h2 id="escolha-titulo" className="text-base font-semibold text-ink">Escolha de {MIN_SERIES} a {MAX_SERIES} séries</h2>
								<p role="status" aria-live="polite" className="mt-1 text-sm text-muted">
									{selectedSeries.length} de {MAX_SERIES} selecionadas
									{selectedSeries.length === MAX_SERIES && ". Remova uma para trocar."}
								</p>
							</div>
						</div>
						<div className="mt-4 flex flex-wrap gap-2">
							{series.map(([key]) => {
								const marcada = selectedSeries.includes(key);
								const bloqueada = !marcada && selectedSeries.length >= MAX_SERIES;
								return (
									<button
										key={key}
										type="button"
										onClick={() => toggleSeries(key)}
										aria-pressed={marcada}
										aria-disabled={bloqueada}
										className={`chip-btn ${bloqueada ? "opacity-50" : ""}`}
									>
										{marcada && <Check className="h-4 w-4" aria-hidden="true" />}
										{key}
									</button>
								);
							})}
						</div>
					</div>
				</section>

				<section className="shell mt-8" aria-labelledby="tabela-titulo">
					<div className="flex flex-wrap items-center justify-between gap-3">
						<h2 id="tabela-titulo" className="text-base font-semibold text-ink">Especificações</h2>
						<label className="flex min-h-11 cursor-pointer items-center gap-2.5 text-sm font-medium text-ink-soft">
							<input
								type="checkbox"
								checked={soDiferencas}
								onChange={(e) => setSoDiferencas(e.target.checked)}
								className="h-5 w-5 cursor-pointer accent-[var(--accent)]"
							/>
							Mostrar só as diferenças
						</label>
					</div>

					<div className="panel mt-3 overflow-hidden">
						<div className="overflow-x-auto">
							<table className="w-full min-w-[30rem] border-collapse text-sm">
								<caption className="sr-only">Comparação das séries {selectedSeries.join(", ")}</caption>
								<thead>
									<tr className="border-b border-line bg-surface-2">
										<th scope="col" className="sticky left-0 z-20 w-28 bg-surface-2 px-4 py-4 text-left font-semibold text-muted sm:w-52 sm:px-6">
											Especificação
										</th>
										{selectedSeries.map((seriesKey) => (
											<th key={seriesKey} scope="col" className="min-w-40 px-4 py-4 text-left sm:px-6">
												<Link href={`/series/${seriesKey}`} className="inline-flex min-h-11 items-center gap-1 font-display text-lg font-semibold tracking-[-0.03em] text-ink hover:text-accent">
													{seriesKey}
													<ArrowUpRight className="h-4 w-4 text-muted" aria-hidden="true" />
												</Link>
											</th>
										))}
									</tr>
								</thead>
								<tbody>
									{compareFields.map(({ category, fields }) => {
										const visiveis = soDiferencas ? fields.filter(({ key }) => diferem(key)) : fields;
										if (soDiferencas && visiveis.length === 0) return null;
										const isCollapsed = collapsedCategories[category] && !soDiferencas;
										return (
											<Fragment key={category}>
												<tr className="border-y border-line bg-surface-2/60">
													<th scope="rowgroup" colSpan={selectedSeries.length + 1} className="p-0 text-left">
														<button
															type="button"
															onClick={() => toggleCategory(category)}
															aria-expanded={!isCollapsed}
															className="flex min-h-12 w-full cursor-pointer items-center justify-between gap-3 px-4 py-3 text-left font-semibold text-ink sm:px-6"
														>
															<span className="sticky left-4 sm:left-6">{category}</span>
															<ChevronDown className={`h-4 w-4 shrink-0 text-muted transition-transform ${isCollapsed ? "" : "rotate-180"}`} aria-hidden="true" />
														</button>
													</th>
												</tr>

												{!isCollapsed &&
													visiveis.map(({ key, label }) => (
														<tr key={key} className="border-b border-line last:border-b-0 hover:bg-surface-2/50">
															<th scope="row" className="sticky left-0 z-10 bg-surface px-4 py-3.5 text-left align-top font-medium text-muted sm:px-6">
																{label}
															</th>
															{selectedSeries.map((seriesKey) => (
																<td key={seriesKey} className="px-4 py-3.5 align-top sm:px-6">
																	{renderValue(valorDe(seriesData[seriesKey], key))}
																</td>
															))}
														</tr>
													))}
											</Fragment>
										);
									})}
								</tbody>
							</table>
						</div>
					</div>
				</section>

				<section className="shell section" aria-labelledby="docs-titulo">
					<h2 id="docs-titulo" className="section-title">Documentação oficial</h2>
					<div className="mt-6 grid gap-3 sm:grid-cols-2 lg:grid-cols-4">
						{selectedSeries.map((seriesKey) => {
							const seriesItem = seriesData[seriesKey];
							return (
								<div key={seriesKey} className="card flex flex-col justify-between gap-5 p-5">
									<Link href={`/series/${seriesKey}`} className="inline-flex min-h-11 items-center font-display text-lg font-semibold tracking-[-0.03em] text-ink hover:text-accent">
										{seriesKey}
									</Link>
									{seriesItem.datasheet ? (
										<a href={seriesItem.datasheet} target="_blank" rel="noopener noreferrer" className="btn btn-ghost btn-sm">
											Datasheet oficial
											<ArrowUpRight className="h-4 w-4" aria-hidden="true" />
											<span className="sr-only"> (abre em nova aba)</span>
										</a>
									) : (
										<span className="text-sm text-muted">Datasheet ainda não publicado</span>
									)}
								</div>
							);
						})}
					</div>

					<div className="panel mt-10 flex flex-col items-start justify-between gap-6 p-7 sm:p-10 md:flex-row md:items-center">
						<div className="max-w-2xl">
							<h2 className="section-title">Quer testar na bancada?</h2>
							<p className="mt-3 text-base text-muted">Veja as placas de desenvolvimento com pinagem, periféricos e link para a loja.</p>
						</div>
						<Link href="/catalogo" className="btn btn-primary shrink-0">
							Ver catálogo de placas
							<ArrowRight className="h-4 w-4" aria-hidden="true" />
						</Link>
					</div>
				</section>
			</main>

			<Footer />
		</div>
	);
}