/* global React */
const { useState: useEState } = React;

// ============================================================
// TABS
// ============================================================
function Tabs({ tabs }) {
  const [active, setActive] = useEState(0);
  return (
    <div className="tabs">
      <div className="tabs-list" role="tablist">
        {tabs.map((t, i) => (
          <button
            key={i}
            role="tab"
            aria-selected={i === active}
            className={"tabs-trigger" + (i === active ? " active" : "")}
            onClick={() => setActive(i)}
          >
            {t.icon && <span className="tabs-icon">{t.icon}</span>}
            {t.label}
          </button>
        ))}
      </div>
      <div className="tabs-panel">
        {tabs[active].content}
      </div>
    </div>
  );
}

// ============================================================
// API BLOCK (parameter list)
// ============================================================
function ApiBlock({ signature, params = [], returns }) {
  return (
    <div className="api-block">
      <div className="api-signature">
        <span className="tk-fn">{signature.name}</span>
        <span className="api-paren">(</span>
        {signature.args.map((a, i) => (
          <React.Fragment key={i}>
            <span className="tk-var">{a.name}</span>
            <span className="api-colon">: </span>
            <span className="tk-cn">{a.type}</span>
            {i < signature.args.length - 1 && <span className="api-comma">, </span>}
          </React.Fragment>
        ))}
        <span className="api-paren">)</span>
        {signature.returns && (
          <>
            <span className="api-arrow"> → </span>
            <span className="tk-cn">{signature.returns}</span>
          </>
        )}
      </div>

      <div className="api-section-label">Parameters</div>
      <ul className="api-params">
        {params.map((p, i) => (
          <li key={i} className="api-param">
            <div className="api-param-head">
              <span className="api-param-name">{p.name}</span>
              <span className="api-param-type">{p.type}</span>
              {p.required && <span className="api-param-required">required</span>}
              {p.default !== undefined && <span className="api-param-default">default: <code>{p.default}</code></span>}
            </div>
            <div className="api-param-desc">{p.desc}</div>
          </li>
        ))}
      </ul>

      {returns && (
        <>
          <div className="api-section-label">Returns</div>
          <div className="api-returns">
            <span className="tk-cn">{returns.type}</span>
            <span className="api-returns-desc"> — {returns.desc}</span>
          </div>
        </>
      )}
    </div>
  );
}

// ============================================================
// CARD GRID (feature cards)
// ============================================================
function CardGrid({ cards }) {
  return (
    <div className="card-grid">
      {cards.map((c, i) => (
        <a href="#" key={i} className="feature-card">
          <div className="feature-card-icon" style={{ background: c.glow }}>
            {c.icon}
          </div>
          <div className="feature-card-title">{c.title}</div>
          <div className="feature-card-desc">{c.desc}</div>
          <div className="feature-card-arrow">
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
              <path d="M7 17 17 7M7 7h10v10"/>
            </svg>
          </div>
        </a>
      ))}
    </div>
  );
}

// ============================================================
// SEARCH MODAL
// ============================================================
function SearchModal() {
  const recent = ["Routing", "Form::addInputType", "Migrations"];
  const results = [
    { section: "The Framework", title: "Routing", excerpt: "URL-pattern + SEO-URL parsing, soft 404, automatic action lookup.", kind: "page" },
    { section: "The Framework", title: "Routing › Soft 404", excerpt: "When a route doesn't match, the dispatcher falls through to a soft 404 view.", kind: "section" },
    { section: "Get Started", title: "Quick Start › Define a route", excerpt: "Routes are declared in config/routes.php and matched by URL pattern.", kind: "section" },
    { section: "API", title: "Router::register()", excerpt: "Register a new route at runtime. Supports pattern matching with named parameters.", kind: "api" },
  ];
  return (
    <div className="search-modal">
      <div className="search-input-wrap">
        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" className="search-icon">
          <circle cx="11" cy="11" r="8"/>
          <path d="m21 21-4.35-4.35"/>
        </svg>
        <input className="search-input" placeholder="Search docs, API, examples..." defaultValue="rout" />
        <kbd className="search-kbd">esc</kbd>
      </div>
      <div className="search-recent">
        <div className="search-section-label">Recent</div>
        <div className="search-recent-list">
          {recent.map((r, i) => (
            <button key={i} className="search-chip">
              <svg width="11" height="11" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><circle cx="12" cy="12" r="10"/><path d="M12 6v6l4 2"/></svg>
              {r}
            </button>
          ))}
        </div>
      </div>
      <div className="search-results">
        <div className="search-section-label">Results</div>
        {results.map((r, i) => (
          <button key={i} className={"search-result" + (i === 0 ? " active" : "")}>
            <div className={"search-result-kind kind-" + r.kind}>{r.kind}</div>
            <div className="search-result-body">
              <div className="search-result-title">
                <span className="search-result-section">{r.section}</span>
                <span className="search-result-sep">›</span>
                <span dangerouslySetInnerHTML={{ __html: r.title.replace(/(rout)/i, "<mark>$1</mark>") }} />
              </div>
              <div className="search-result-excerpt">{r.excerpt}</div>
            </div>
            <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" className="search-result-go">
              <path d="M7 17 17 7M7 7h10v10"/>
            </svg>
          </button>
        ))}
      </div>
      <div className="search-footer">
        <span><kbd>↑↓</kbd> navigate</span>
        <span><kbd>↵</kbd> open</span>
        <span><kbd>⌘K</kbd> close</span>
        <div className="search-credit">Powered by <strong>Nibiru Search</strong></div>
      </div>
    </div>
  );
}

// ============================================================
// FAB (floating help button)
// ============================================================
function FAB() {
  return (
    <div className="fab-wrap">
      <button className="fab" aria-label="Help">
        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5">
          <path d="M12 5v14M5 12h14"/>
        </svg>
      </button>
      <div className="fab-tooltip">Ask AI assistant</div>
    </div>
  );
}

// ============================================================
// PAGINATION (prev / next page)
// ============================================================
function Pagination({ prev, next }) {
  return (
    <nav className="page-nav">
      {prev ? (
        <a href="#" className="page-nav-link page-nav-prev">
          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><path d="m15 18-6-6 6-6"/></svg>
          <div className="page-nav-stack">
            <div className="page-nav-label">Previous</div>
            <div className="page-nav-title">{prev}</div>
          </div>
        </a>
      ) : <div />}
      {next ? (
        <a href="#" className="page-nav-link page-nav-next">
          <div className="page-nav-stack">
            <div className="page-nav-label">Next</div>
            <div className="page-nav-title">{next}</div>
          </div>
          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><path d="m9 18 6-6-6-6"/></svg>
        </a>
      ) : <div />}
    </nav>
  );
}

// ============================================================
// MOBILE DRAWER
// ============================================================
function MobileDrawer() {
  return (
    <div className="mobile-drawer">
      <div className="mobile-drawer-header">
        <div className="mobile-drawer-brand">
          <LotusMark size={26} />
          <span>Nibiru</span>
        </div>
        <button className="mobile-drawer-close" aria-label="Close">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><path d="m18 6-12 12M6 6l12 12"/></svg>
        </button>
      </div>
      <button className="mobile-drawer-search">
        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.35-4.35"/></svg>
        <span>Search</span>
        <kbd>⌘K</kbd>
      </button>
      <Sidebar />
      <div className="mobile-drawer-footer">
        <button className="mobile-drawer-pill">
          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><circle cx="12" cy="12" r="4"/><path d="M12 2v2M12 20v2M4.93 4.93l1.41 1.41M17.66 17.66l1.41 1.41"/></svg>
          Theme
        </button>
        <button className="mobile-drawer-pill">EN</button>
        <a href="#" className="mobile-drawer-pill">GitHub ↗</a>
      </div>
    </div>
  );
}

// ============================================================
// 404 / EMPTY STATE
// ============================================================
function NotFound() {
  return (
    <div className="not-found">
      <div className="not-found-orbit">
        <svg viewBox="0 0 320 200" width="100%" height="100%" aria-hidden="true">
          <defs>
            <radialGradient id="lostStar" cx="50%" cy="50%" r="50%">
              <stop offset="0%" stopColor="#fff4d9"/>
              <stop offset="50%" stopColor="#ffb574"/>
              <stop offset="100%" stopColor="#b86bff" stopOpacity="0"/>
            </radialGradient>
          </defs>
          {/* dashed orbit */}
          <ellipse cx="160" cy="100" rx="140" ry="60" fill="none" stroke="rgba(184,107,255,0.3)" strokeWidth="1" strokeDasharray="3 6"/>
          <ellipse cx="160" cy="100" rx="100" ry="42" fill="none" stroke="rgba(184,107,255,0.18)" strokeWidth="1" strokeDasharray="3 6"/>
          {/* central star */}
          <circle cx="160" cy="100" r="50" fill="url(#lostStar)"/>
          <circle cx="160" cy="100" r="6" fill="#fff4d9"/>
          {/* drifting probe (off-orbit) */}
          <g transform="translate(280 40)">
            <circle r="3" fill="#6ad9ff"/>
            <circle r="8" fill="#6ad9ff" opacity="0.2"/>
          </g>
          <text x="290" y="35" fill="#6ad9ff" fontSize="10" fontFamily="JetBrains Mono">PROBE-404</text>
          <line x1="160" y1="100" x2="280" y2="40" stroke="#6ad9ff" strokeWidth="1" strokeDasharray="2 3" opacity="0.4"/>
        </svg>
      </div>
      <div className="not-found-code">404 / off-orbit</div>
      <h2 className="not-found-title">This page drifted away from Nibiru.</h2>
      <p className="not-found-desc">
        The probe couldn't find the page you requested. It may have been moved, renamed, or pulled into a different orbit.
      </p>
      <div className="not-found-actions">
        <a href="#" className="btn btn-primary">Return to docs</a>
        <a href="#" className="btn btn-ghost">Open search</a>
      </div>
    </div>
  );
}

Object.assign(window, { Tabs, ApiBlock, CardGrid, SearchModal, FAB, Pagination, MobileDrawer, NotFound });