import { Suspense } from 'react';
import { redirect } from 'next/navigation';
import Link from 'next/link';
import { getServerSession } from '@/lib/auth/getServerSession';
import { PERMISSIONS } from '@/lib/permissions/permissions';
import AccessDenied from '@/components/admin/errors/AccessDenied';
import BannersTable from '@/components/admin/banners/BannersTable';
import { cookies } from 'next/headers';
import { SESSION_COOKIE } from '@/lib/auth/requireAuth';
import { Metadata } from 'next';

export const metadata: Metadata = { title: 'Banners' };

// ─── Data Fetchers ──────────────────────────────────────────────────────────
async function getBanners(sessionToken: string) {
  try {
    const baseUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000';
    const res = await fetch(`${baseUrl}/api/banners?page=1&limit=10`, {
      cache: 'no-store',
      headers: { Authorization: `Bearer ${sessionToken}` },
    });

    if (!res.ok) {
      return {
        banners: [],
        pagination: { page: 1, limit: 10, total: 0, totalPages: 0 },
      };
    }

    const data = await res.json();
    return data.data;
  } catch {
    return {
      banners: [],
      pagination: { page: 1, limit: 10, total: 0, totalPages: 0 },
    };
  }
}

async function getCounts(sessionToken: string) {
  try {
    const baseUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000';
    const res = await fetch(`${baseUrl}/api/banners/counts`, {
      cache: 'no-store',
      headers: { Authorization: `Bearer ${sessionToken}` },
    });

    if (!res.ok) {
      return { active: 0, deleted: 0 };
    }

    const data = await res.json();
    return data.data as { active: number; deleted: number };
  } catch {
    return { active: 0, deleted: 0 };
  }
}

// ─── Page Content ───────────────────────────────────────────────────────────
async function BannersContent() {
  const cookieStore = await cookies();
  const sessionId = cookieStore.get(SESSION_COOKIE)?.value;
  if (!sessionId) redirect('/admin/login');

  const session = await getServerSession();
  if (!session) redirect('/admin/login');

  if (!session.permissions.includes(PERMISSIONS.BANNERS_READ)) {
    return <AccessDenied />;
  }

  const canCreate = session.permissions.includes(PERMISSIONS.BANNERS_CREATE);
  const canEdit = session.permissions.includes(PERMISSIONS.BANNERS_UPDATE);
  const canDelete = session.permissions.includes(PERMISSIONS.BANNERS_DELETE);
  const canBulkDelete = session.permissions.includes(PERMISSIONS.BANNERS_BULK_DELETE);
  const canViewDeleted = session.permissions.includes(PERMISSIONS.BANNERS_VIEW_DELETED);
  const canPermanentDelete = session.permissions.includes(PERMISSIONS.BANNERS_PERMANENT_DELETE);
  const canRestore = session.permissions.includes(PERMISSIONS.BANNERS_RESTORE);
  const canBulkRestore = session.permissions.includes(PERMISSIONS.BANNERS_BULK_RESTORE);
  const canViewTimeline = session.permissions.includes(PERMISSIONS.BANNERS_VIEW_TIMELINE);

  const [initialData, counts] = await Promise.all([
    getBanners(sessionId),
    getCounts(sessionId),
  ]);

  return (
    <>
      <div className="flex flex-wrap justify-between items-center gap-3 mb-6">
        <div>
          <h1
            className="text-2xl font-semibold"
            style={{ color: 'var(--color-text)' }}
          >
            Banners
          </h1>
          <p
            className="text-sm mt-1"
            style={{ color: 'var(--color-text-secondary)' }}
          >
            Manage promotional banners
          </p>
        </div>

        {canCreate && (
          <Link
            href="/admin/dashboard/banners/new"
            className="inline-flex items-center gap-2 px-4 py-2 rounded-lg text-sm font-medium transition-all hover:opacity-90"
            style={{ background: 'var(--color-cta)', color: 'white' }}
          >
            <svg
              width="16"
              height="16"
              viewBox="0 0 24 24"
              fill="none"
              stroke="currentColor"
              strokeWidth="2"
            >
              <path d="M12 5v14m-7-7h14" />
            </svg>
            Add Banner
          </Link>
        )}
      </div>

      <BannersTable
        canEdit={canEdit}
        canDelete={canDelete}
        canBulkDelete={canBulkDelete}
        canViewDeleted={canViewDeleted}
        canPermanentDelete={canPermanentDelete}
        canRestore={canRestore}
        canBulkRestore={canBulkRestore}
        canViewTimeline={canViewTimeline}
        initialBanners={initialData}
        initialCounts={counts}
      />
    </>
  );
}

export default function BannersPage() {
  return (
    <div className="sm:p-6">
      <Suspense fallback={<div className="skeleton h-96 rounded-lg" />}>
        <BannersContent />
      </Suspense>
    </div>
  );
}