'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { cn } from '@/lib/cn';
import { MosaicLogo } from '@/components/ui/mosaic-logo';
import { useSidebar } from './sidebar-context';

interface NavItem {
  label: string;
  href: string;
  icon: React.JSX.Element;
}

function IconChat(): React.JSX.Element {
  return (
    <svg
      width="16"
      height="16"
      viewBox="0 0 16 16"
      fill="none"
      stroke="currentColor"
      strokeWidth="1.5"
    >
      <path d="M3 4.5A2.5 2.5 0 0 1 5.5 2h5A2.5 2.5 0 0 1 13 4.5v3A2.5 2.5 0 0 1 10.5 10H8l-3.5 3v-3H5.5A2.5 2.5 0 0 1 3 7.5z" />
    </svg>
  );
}

function IconTasks(): React.JSX.Element {
  return (
    <svg
      width="16"
      height="16"
      viewBox="0 0 16 16"
      fill="none"
      stroke="currentColor"
      strokeWidth="1.5"
    >
      <path d="M6 3h7M6 8h7M6 13h7" />
      <path d="M2.5 3.5 3.5 4.5 5 2.5M2.5 8.5 3.5 9.5 5 7.5M2.5 13.5 3.5 14.5 5 12.5" />
    </svg>
  );
}

function IconProjects(): React.JSX.Element {
  return (
    <svg
      width="16"
      height="16"
      viewBox="0 0 16 16"
      fill="none"
      stroke="currentColor"
      strokeWidth="1.5"
    >
      <path d="M2 4.5A1.5 1.5 0 0 1 3.5 3h3l1.5 1.5h4A1.5 1.5 0 0 1 13.5 6v5.5A1.5 1.5 0 0 1 12 13H3.5A1.5 1.5 0 0 1 2 11.5z" />
    </svg>
  );
}

function IconSettings(): React.JSX.Element {
  return (
    <svg
      width="16"
      height="16"
      viewBox="0 0 16 16"
      fill="none"
      stroke="currentColor"
      strokeWidth="1.5"
    >
      <circle cx="8" cy="8" r="2.25" />
      <path d="M8 1.5v2M8 12.5v2M1.5 8h2M12.5 8h2M3.05 3.05l1.4 1.4M11.55 11.55l1.4 1.4M3.05 12.95l1.4-1.4M11.55 4.45l1.4-1.4" />
    </svg>
  );
}

function IconAdmin(): React.JSX.Element {
  return (
    <svg
      width="16"
      height="16"
      viewBox="0 0 16 16"
      fill="none"
      stroke="currentColor"
      strokeWidth="1.5"
    >
      <path d="M8 1.75 13 3.5v3.58c0 3.12-1.88 5.94-5 7.17-3.12-1.23-5-4.05-5-7.17V3.5z" />
      <path d="M6.25 7.75 7.5 9l2.5-2.5" />
    </svg>
  );
}

const navItems: NavItem[] = [
  { label: 'Chat', href: '/chat', icon: <IconChat /> },
  { label: 'Tasks', href: '/tasks', icon: <IconTasks /> },
  { label: 'Projects', href: '/projects', icon: <IconProjects /> },
  { label: 'Settings', href: '/settings', icon: <IconSettings /> },
  { label: 'Admin', href: '/admin', icon: <IconAdmin /> },
];

export function Sidebar(): React.ReactElement {
  const pathname = usePathname();
  const { mobileOpen, setMobileOpen } = useSidebar();

  return (
    <>
      <aside
        className="app-sidebar"
        data-mobile-open={mobileOpen ? 'true' : undefined}
        style={{
          width: 'var(--sidebar-w)',
          background: 'var(--surface)',
          borderRightColor: 'var(--border)',
        }}
      >
        <div
          className="flex h-16 items-center gap-3 border-b px-5"
          style={{ borderColor: 'var(--border)' }}
        >
          <MosaicLogo size={32} />
          <div className="flex min-w-0 flex-col">
            <span className="text-sm font-semibold uppercase tracking-[0.12em] text-[var(--text)]">
              Mosaic
            </span>
            <span className="text-xs text-[var(--muted)]">Mission Control</span>
          </div>
        </div>

        <nav className="flex-1 px-3 py-4">
          <div className="mb-3 px-2 text-[11px] font-medium uppercase tracking-[0.18em] text-[var(--muted)]">
            Workspace
          </div>
          <div className="space-y-1.5">
            {navItems.map((item) => {
              const isActive = pathname === item.href || pathname.startsWith(`${item.href}/`);

              return (
                <Link
                  key={item.href}
                  href={item.href}
                  onClick={() => setMobileOpen(false)}
                  className={cn(
                    'group flex items-center gap-3 rounded-xl px-3 py-2.5 text-sm transition-all duration-150',
                    isActive ? 'font-medium' : 'hover:bg-white/4',
                  )}
                  style={
                    isActive
                      ? {
                          background: 'color-mix(in srgb, var(--primary) 18%, transparent)',
                          color: 'var(--primary)',
                        }
                      : { color: 'var(--text-2)' }
                  }
                >
                  <span className="shrink-0" aria-hidden="true">
                    {item.icon}
                  </span>
                  <span>{item.label}</span>
                </Link>
              );
            })}
          </div>
        </nav>

        <div className="border-t px-5 py-4" style={{ borderColor: 'var(--border)' }}>
          <p className="text-xs text-[var(--muted)]">Mosaic Stack v0.0.4</p>
        </div>
      </aside>

      {mobileOpen ? (
        <button
          type="button"
          aria-label="Close sidebar"
          className="fixed inset-0 z-40 bg-black/40 md:hidden"
          onClick={() => setMobileOpen(false)}
        />
      ) : null}
    </>
  );
}
