'use client';

import { useEffect, useState } from 'react';
import { useRouter } from 'next/navigation';
import Link from 'next/link';
import { useOrgAdmin } from '@/app/_lib/org-admin-context';

export default function OrgTenantsPage() {
  const { orgAdmin, loading } = useOrgAdmin();
  const router = useRouter();
  const [tenants, setTenants] = useState<any[]>([]);
  const [showAdd, setShowAdd] = useState(false);
  const [form, setForm] = useState({ name: '', slug: '' });
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState('');

  async function load() {
    const res = await fetch('/api/org/tenants');
    if (res.ok) setTenants(await res.json());
  }

  useEffect(() => {
    if (loading) return;
    if (!orgAdmin) { router.replace('/org/login'); return; }
    void load();
  }, [orgAdmin, loading, router]);

  async function handleAdd(e: React.FormEvent) {
    e.preventDefault();
    setError('');
    setSaving(true);
    try {
      const res = await fetch('/api/org/tenants', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(form),
      });
      if (!res.ok) {
        const err = await res.json().catch(() => ({}));
        throw new Error(err.message ?? 'Failed to create chapter');
      }
      setShowAdd(false);
      setForm({ name: '', slug: '' });
      void load();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Error');
    } finally {
      setSaving(false);
    }
  }

  if (loading || !orgAdmin) return <p className="text-gray-500">Loading...</p>;

  return (
    <div>
      <div className="flex items-center justify-between mb-6">
        <h1 className="text-2xl font-bold">Chapters</h1>
        {orgAdmin.role === 'ORG_OWNER' && (
          <button
            onClick={() => setShowAdd(!showAdd)}
            className="bg-blue-600 text-white rounded-lg px-4 py-2 text-sm font-medium hover:bg-blue-700"
          >
            Add Chapter
          </button>
        )}
      </div>

      {showAdd && (
        <form onSubmit={(e) => void handleAdd(e)} className="bg-white rounded-xl border p-5 mb-6 flex flex-col gap-4">
          <h2 className="font-semibold">New Chapter</h2>
          <div className="grid grid-cols-2 gap-4">
            <div>
              <label className="block text-sm font-medium mb-1">Name</label>
              <input
                type="text"
                value={form.name}
                onChange={(e) => setForm({ ...form, name: e.target.value })}
                className="w-full border rounded-lg px-3 py-2 text-sm"
                required
              />
            </div>
            <div>
              <label className="block text-sm font-medium mb-1">Slug</label>
              <input
                type="text"
                value={form.slug}
                onChange={(e) => setForm({ ...form, slug: e.target.value })}
                className="w-full border rounded-lg px-3 py-2 text-sm"
                placeholder="e.g. tenant_up_parivaar_dallas"
                required
              />
            </div>
          </div>
          {error && <p className="text-red-600 text-sm">{error}</p>}
          <div className="flex gap-2">
            <button type="submit" disabled={saving} className="bg-blue-600 text-white rounded-lg px-4 py-2 text-sm font-medium hover:bg-blue-700 disabled:opacity-50">
              {saving ? 'Creating...' : 'Create'}
            </button>
            <button type="button" onClick={() => setShowAdd(false)} className="border rounded-lg px-4 py-2 text-sm hover:bg-gray-50">
              Cancel
            </button>
          </div>
        </form>
      )}

      <div className="bg-white rounded-xl border overflow-hidden">
        <table className="w-full text-sm">
          <thead className="bg-gray-50 text-left">
            <tr>
              <th className="px-4 py-3 font-medium">Name</th>
              <th className="px-4 py-3 font-medium">Slug</th>
              <th className="px-4 py-3 font-medium">Messages</th>
              <th className="px-4 py-3 font-medium">Members</th>
              <th className="px-4 py-3 font-medium">Status</th>
            </tr>
          </thead>
          <tbody className="divide-y">
            {tenants.map((t: any) => (
              <tr key={t.id} className="hover:bg-gray-50">
                <td className="px-4 py-3">
                  <Link href={`/org/tenants/${t.id}`} className="text-blue-600 hover:underline font-medium">
                    {t.name}
                  </Link>
                </td>
                <td className="px-4 py-3 text-gray-500">{t.slug}</td>
                <td className="px-4 py-3">{t._count?.messages ?? '—'}</td>
                <td className="px-4 py-3">{t._count?.towerUsers ?? '—'}</td>
                <td className="px-4 py-3">
                  <span className={`text-xs font-medium px-2 py-1 rounded-full ${t.isActive ? 'bg-green-100 text-green-700' : 'bg-red-100 text-red-700'}`}>
                    {t.isActive ? 'Active' : 'Inactive'}
                  </span>
                </td>
              </tr>
            ))}
          </tbody>
        </table>
        {tenants.length === 0 && <p className="p-4 text-gray-400">No chapters yet.</p>}
      </div>
    </div>
  );
}