import { A } from '@solidjs/router';
import { createResource, createSignal, Show, For } from 'solid-js';
import { Eye, Pencil, Trash2 } from 'lucide-solid';
import AdminShell from '~/components/AdminShell';

const API = '/api/gateway';

type Role = {
  id: string;
  name: string;
  description?: string;
  code?: string;
};

async function loadInternalRoles(): Promise<Role[]> {
  try {
    const res = await fetch(`${API}/api/admin/roles?audience=INTERNAL`);
    if (!res.ok) throw new Error('Failed to load');
    const data = await res.json();
    const rows = Array.isArray(data) ? data : (data.roles || []);
    return rows.map((r: any) => ({
      id: r.id,
      name: r.name,
      description: r.description || '',
      code: r.code || r.key || '',
    }));
  } catch {
    return [];
  }
}

export default function InternalRolesPage() {
  const [roles, { refetch }] = createResource(loadInternalRoles);
  const [deleting, setDeleting] = createSignal('');
  const [deleteError, setDeleteError] = createSignal('');

  const handleDelete = async (id: string, name: string) => {
    if (!confirm(`Delete role "${name}"? This cannot be undone.`)) return;
    setDeleting(id); setDeleteError('');
    try {
      const res = await fetch(`${API}/api/admin/roles/${id}`, { method: 'DELETE' });
      if (!res.ok) throw new Error('Failed to delete role');
      refetch();
    } catch (err: any) {
      setDeleteError(err.message || 'Failed to delete role');
    } finally {
      setDeleting('');
    }
  };

  return (
    <AdminShell>
      <div class="flex flex-col -mx-6 -mt-6 min-h-full">

        {/* ── Page header ── */}
        <div class="bg-white border-b border-gray-200 px-6 py-4 flex items-center justify-between">
          <div>
            <h1 class="text-xl font-semibold text-gray-900">Internal Role Management</h1>
            <p class="text-sm text-gray-500 mt-0.5">Manage internal employee roles and permissions.</p>
          </div>
          <A
            href="/admin/roles/create"
            class="flex items-center gap-2 rounded-lg bg-[#0a1d37] px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-[#0f2a4e] shadow-sm"
          >
            Create Internal Role
          </A>
        </div>

        {/* ── Content ── */}
        <div class="p-6">
          <Show when={deleteError()}>
            <div class="mb-4 rounded-lg border border-red-200 bg-red-50 px-4 py-3 text-sm text-red-700">{deleteError()}</div>
          </Show>

          <div class="table-card">
            <div class="overflow-x-auto">
              <table class="data-table w-full text-sm">
                <thead>
                  <tr>
                    <th>Name</th>
                    <th>Description</th>
                    <th class="text-right">Actions</th>
                  </tr>
                </thead>
                <tbody>
                  <Show when={roles.loading}>
                    <tr><td colspan="3" class="py-10 text-center text-sm text-slate-400">Loading internal roles…</td></tr>
                  </Show>
                  <Show when={!roles.loading && roles.error}>
                    <tr><td colspan="3" class="py-10 text-center text-sm text-red-500">Failed to load roles. Is the backend running?</td></tr>
                  </Show>
                  <Show when={!roles.loading && !roles.error && (roles()?.length ?? 0) === 0}>
                    <tr><td colspan="3" class="py-10 text-center text-sm text-slate-400">No internal roles found. Create your first role.</td></tr>
                  </Show>
                  <For each={roles()}>
                    {(role) => (
                      <tr class="hover:bg-slate-50">
                        <td>
                          <p class="font-medium text-gray-900">{role.name}</p>
                          <p class="mt-0.5 text-xs text-slate-500">{role.code || role.id?.slice(0, 8) || '—'}</p>
                        </td>
                        <td class="text-slate-600">{role.description || 'No description added yet.'}</td>
                        <td>
                          <div class="flex items-center justify-end gap-2">
                            <A href={`/admin/roles/${role.id}`} title="View Role"
                              class="action-btn flex items-center justify-center hover:bg-gray-50 transition-colors">
                              <Eye size={14} class="text-gray-600" />
                            </A>
                            <A href={`/admin/roles/${role.id}/edit`} title="Edit Role"
                              class="action-btn flex items-center justify-center hover:bg-gray-50 transition-colors">
                              <Pencil size={14} class="text-gray-600" />
                            </A>
                            <button
                              title="Delete Role"
                              disabled={deleting() === role.id}
                              onClick={() => handleDelete(role.id, role.name)}
                              class="action-btn flex items-center justify-center border-red-100 bg-red-50 hover:bg-red-100 transition-colors"
                            >
                              <Trash2 size={14} class="text-red-600" />
                            </button>
                          </div>
                        </td>
                      </tr>
                    )}
                  </For>
                </tbody>
              </table>
            </div>
          </div>
        </div>
      </div>
    </AdminShell>
  );
}