import { NavLink, Outlet, useParams } from 'react-router-dom';
import { Database, Copy, Upload } from 'lucide-react';
import { IconTile } from '@/components/ui/icon-tile';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { cn } from '@/lib/utils';
import { useBuckets } from '@/hooks/useApi';
import { toast } from 'sonner';

interface TabSpec {
  to: string;
  label: string;
  end?: boolean;
}

const tabs: TabSpec[] = [
  { to: 'objects', label: 'Objects' },
  { to: 'permissions', label: 'Permissions' },
  { to: 'website', label: 'Website' },
  { to: 'settings', label: 'Settings' },
];

function formatBytes(n?: number) {
  if (n == null) return '';
  if (n < 1024) return `${n} B`;
  const units = ['KB', 'MB', 'GB', 'TB'];
  let v = n / 1024;
  for (const u of units) {
    if (v < 1024) return `${v.toFixed(v >= 10 ? 0 : 1)} ${u}`;
    v /= 1024;
  }
  return `${v.toFixed(0)} PB`;
}

export function BucketDetailShell() {
  const { bucketName = '' } = useParams<{ bucketName: string }>();
  const { data: buckets = [] } = useBuckets();
  const bucket = buckets.find((b) => b.name === bucketName);

  const s3Url = `s3://${bucketName}`;
  const copyUrl = async () => {
    try {
      await navigator.clipboard.writeText(s3Url);
      toast.success('URL copied');
    } catch {
      toast.error('Failed to copy');
    }
  };

  return (
    <div className="flex flex-col">
      {/* Hero */}
      <section className="px-7 pt-6 pb-5">
        <div className="flex flex-col gap-4 sm:flex-row sm:items-start sm:justify-between">
          <div className="flex min-w-0 items-start gap-3">
            <IconTile icon={<Database />} tone="primary" size="lg" />
            <div className="min-w-0">
              <h1 className="truncate text-[26px] font-semibold tracking-[-0.02em]">{bucketName}</h1>
              <p className="mt-1 truncate font-mono text-[13.5px] text-[var(--muted-foreground)]">{s3Url}</p>
              <div className="mt-2 flex flex-wrap gap-1.5">
                <Badge variant="success">Active</Badge>
                {bucket?.objectCount != null && <Badge>{bucket.objectCount.toLocaleString()} objects</Badge>}
                {bucket?.size != null && <Badge>{formatBytes(bucket.size)}</Badge>}
              </div>
            </div>
          </div>
          <div className="flex shrink-0 items-center gap-2">
            <Button variant="secondary" onClick={copyUrl}>
              <Copy /> Copy URL
            </Button>
            <Button variant="primary" onClick={() => document.dispatchEvent(new CustomEvent('bucket:upload'))}>
              <Upload /> Upload
            </Button>
          </div>
        </div>
      </section>

      {/* Tabs */}
      <nav className="flex h-12 items-center gap-0 border-b border-[var(--border)] px-7">
        {tabs.map((t) => (
          <NavLink
            key={t.to}
            to={t.to}
            end={t.end}
            className={({ isActive }) =>
              cn(
                'relative -mb-px inline-flex h-12 items-center px-3.5 text-[14px] font-medium transition-colors',
                'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[var(--ring)] rounded-sm',
                isActive
                  ? 'text-[var(--primary)] border-b-2 border-[var(--primary)]'
                  : 'text-[var(--muted-foreground)] border-b-2 border-transparent hover:text-[var(--foreground)]',
              )
            }
          >
            {t.label}
          </NavLink>
        ))}
      </nav>

      <div className="min-w-0">
        <Outlet />
      </div>
    </div>
  );
}