import Link from "next/link";
import { useEffect, useRef, useState, type ReactNode } from "react";
import type { DocLink } from "@/lib/docs";
import { sectionFor } from "@/lib/navigation";

export function Brand() {
  return (
    <Link className="brand" href="/" aria-label="Tabularium 首页">
      <span className="brand-mark" aria-hidden="true">
        <i />
        <i />
        <i />
      </span>
      <span>
        Endor <span className="brand-divider">/</span>{" "}
        <strong>Tabularium</strong>
      </span>
      <span className="docs-badge">文档</span>
    </Link>
  );
}
export function Navigation({
  docs,
  current,
  onNavigate,
}: {
  docs: DocLink[];
  current?: string;
  onNavigate?: () => void;
}) {
  const groups = [...new Set(docs.map((d) => sectionFor(d.slug).group))];
  return (
    <nav aria-label="文档导航">
      <Link
        onClick={onNavigate}
        className={`nav-home ${!current ? "selected" : ""}`}
        href="/"
      >
        ▦ <span>文档概览</span>
      </Link>
      {groups.map((group) => (
        <div className="nav-group" key={group}>
          <p>{group}</p>
          {docs
            .filter((d) => sectionFor(d.slug).group === group)
            .map((d) => (
              <Link
                onClick={onNavigate}
                aria-current={d.slug === current ? "page" : undefined}
                className="nav-item"
                href={`/docs/${d.slug}`}
                key={d.slug}
              >
                {d.title}
                {sectionFor(d.slug).label.includes("草案") && (
                  <span className="tiny-dot" aria-label="草案" />
                )}
              </Link>
            ))}
        </div>
      ))}
      <div className="nav-note">
        <span className="status-dot" /> 与代码一起演进
        <p>文字、设计与图形的共同档案。</p>
      </div>
    </nav>
  );
}
export function Shell({
  docs,
  current,
  children,
}: {
  docs: DocLink[];
  current?: string;
  children: ReactNode;
}) {
  const dialog = useRef<HTMLDialogElement>(null);
  const input = useRef<HTMLInputElement>(null);
  const trigger = useRef<HTMLButtonElement>(null);
  const [query, setQuery] = useState("");
  const [selected, setSelected] = useState(0);
  const [menu, setMenu] = useState(false);
  const results = docs.filter((d) =>
    `${d.title} ${d.searchText}`
      .toLocaleLowerCase()
      .includes(query.trim().toLocaleLowerCase()),
  );
  function openSearch() {
    setQuery("");
    setSelected(0);
    dialog.current?.showModal();
    input.current?.focus();
  }
  function closeSearch() {
    dialog.current?.close();
    trigger.current?.focus();
  }
  useEffect(() => {
    function keyboard(e: KeyboardEvent) {
      if ((e.metaKey || e.ctrlKey) && e.key.toLowerCase() === "k") {
        e.preventDefault();
        dialog.current?.showModal();
        input.current?.focus();
      }
    }
    document.addEventListener("keydown", keyboard);
    return () => document.removeEventListener("keydown", keyboard);
  }, []);
  return (
    <>
      <a className="skip-link" href="#content">
        跳到正文
      </a>
      <header className="site-header">
        <Brand />
        <nav className="top-nav" aria-label="主导航">
          <Link href="/">文档概览</Link>
          <Link href="/docs/00-endor-concepts-draft">架构设计</Link>
          <a href="https://gitea.entroia.com/Zayden-Jung/endorphin-tabularium-docs">
            仓库 ↗
          </a>
        </nav>
        <button
          ref={trigger}
          className="search-trigger"
          aria-label="搜索文档"
          onClick={openSearch}
        >
          <span aria-hidden="true">⌕</span>
          <span>搜索文档…</span>
          <kbd>⌘ K</kbd>
        </button>
        <button
          className="logout-button"
          aria-label="退出登录"
          onClick={async () => {
            const response = await fetch("/api/auth/logout", {
              method: "POST",
            });
            if (response.ok) {
              // Drop cached private document data when ending the session.
              // eslint-disable-next-line @next/next/no-location-assign-relative-destination
              window.location.assign("/login");
            }
          }}
        >
          退出
        </button>
      </header>
      <div className="mobile-bar">
        <button
          onClick={() => setMenu(!menu)}
          aria-expanded={menu}
          aria-controls="mobile-navigation"
        >
          ☰ <span>文档目录</span>
          <span>{menu ? "−" : "+"}</span>
        </button>
      </div>
      {menu && (
        <div className="mobile-navigation" id="mobile-navigation">
          <Navigation
            docs={docs}
            current={current}
            onNavigate={() => setMenu(false)}
          />
        </div>
      )}
      {children}
      <dialog
        ref={dialog}
        className="search-dialog"
        aria-label="搜索文档"
        onClick={(e) => {
          if (e.target === e.currentTarget) closeSearch();
        }}
        onClose={() => trigger.current?.focus()}
      >
        <div className="search-input-row">
          <span aria-hidden="true">⌕</span>
          <input
            ref={input}
            value={query}
            placeholder="搜索文档、命令或概念…"
            aria-label="搜索文档内容"
            aria-controls="search-results"
            onChange={(e) => {
              setQuery(e.target.value);
              setSelected(0);
            }}
            onKeyDown={(e) => {
              if (e.key === "ArrowDown") {
                e.preventDefault();
                setSelected((i) =>
                  Math.max(0, Math.min(i + 1, results.length - 1)),
                );
              }
              if (e.key === "ArrowUp") {
                e.preventDefault();
                setSelected((i) => Math.max(i - 1, 0));
              }
              if (e.key === "Enter") {
                e.preventDefault();
                dialog.current
                  ?.querySelector<HTMLAnchorElement>(
                    `[data-result="${selected}"]`,
                  )
                  ?.click();
              }
            }}
          />
          <button onClick={closeSearch} aria-label="关闭搜索">
            Esc
          </button>
        </div>
        <div id="search-results" className="search-results">
          <p className="eyebrow" role="status">
            {query ? `${results.length} 篇匹配文档` : "浏览文档"}
          </p>
          {results.map((d, i) => (
            <Link
              data-result={i}
              className={
                selected === i ? "search-result selected" : "search-result"
              }
              onClick={closeSearch}
              key={d.slug}
              href={`/docs/${d.slug}`}
            >
              <span>{sectionFor(d.slug).group}</span>
              <strong>
                {d.title} <span aria-hidden="true">↗</span>
              </strong>
              <small>{sectionFor(d.slug).description}</small>
            </Link>
          ))}
          {!results.length && (
            <p className="empty-search">
              没有找到相关文档。试试「节点」「SVG」或「pnpm」。
            </p>
          )}
        </div>
        <div className="search-footer">
          ↑ ↓ 选择 <span>Enter 打开 · Esc 关闭</span>
        </div>
      </dialog>
    </>
  );
}