import { For, Show, createMemo, createSignal, onMount } from 'solid-js';
import { CARD, BTN_PRIMARY, BTN_GHOST } from '~/components/DashboardShell';

const API = '/api/gateway';

type AdminMetrics = {
  totalUsers: number;
  pendingVerifications: number;
  activeSessions: number;
  totalRoles: number;
  totalPhotographers: number;
  totalCustomers: number;
  totalCompanies: number;
  totalJobSeekers: number;
};

async function adminFetch(path: string, opts?: RequestInit) {
  const token =
    typeof window !== 'undefined'
      ? window.sessionStorage.getItem('nxtgauge_access_token') || ''
      : '';
  const cleanPath = path.startsWith('/api/') ? path.slice(4) : path;
  return fetch(`${API}${cleanPath}`, {
    ...opts,
    credentials: 'include',
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
      ...(opts?.headers ?? {}),
    },
  });
}

export default function AdminDashboardPage() {
  const [metrics, setMetrics] = createSignal<AdminMetrics>({
    totalUsers: 0,
    pendingVerifications: 0,
    activeSessions: 0,
    totalRoles: 0,
    totalPhotographers: 0,
    totalCustomers: 0,
    totalCompanies: 0,
    totalJobSeekers: 0,
  });
  const [loading, setLoading] = createSignal(true);
  const [error, setError] = createSignal('');

  const loadAdminMetrics = async () => {
    setLoading(true);
    setError('');
    try {
      const [usersRes, rolesRes, photographersRes, customersRes, companiesRes, jobSeekersRes] =
        await Promise.all([
          adminFetch('/api/admin/users?page=1&limit=1'),
          adminFetch('/api/admin/roles'),
          adminFetch('/api/admin/users?role=photographer&page=1&limit=1'),
          adminFetch('/api/admin/users?role=customer&page=1&limit=1'),
          adminFetch('/api/admin/users?role=company&page=1&limit=1'),
          adminFetch('/api/admin/users?role=jobseeker&page=1&limit=1'),
        ]);

      const usersJson = await usersRes.json().catch(() => ({}));
      const rolesJson = await rolesRes.json().catch(() => ({}));
      const photographersJson = await photographersRes.json().catch(() => ({}));
      const customersJson = await customersRes.json().catch(() => ({}));
      const companiesJson = await companiesRes.json().catch(() => ({}));
      const jobSeekersJson = await jobSeekersRes.json().catch(() => ({}));

      setMetrics({
        totalUsers: usersJson?.total ?? usersJson?.count ?? 0,
        pendingVerifications: 0,
        activeSessions: 0,
        totalRoles: Array.isArray(rolesJson) ? rolesJson.length : 0,
        totalPhotographers: photographersJson?.total ?? photographersJson?.count ?? 0,
        totalCustomers: customersJson?.total ?? customersJson?.count ?? 0,
        totalCompanies: companiesJson?.total ?? companiesJson?.count ?? 0,
        totalJobSeekers: jobSeekersJson?.total ?? jobSeekersJson?.count ?? 0,
      });
    } catch (e: any) {
      setError('Failed to load admin metrics: ' + e.message);
    } finally {
      setLoading(false);
    }
  };

  onMount(loadAdminMetrics);

  const statCards = createMemo(() => [
    { label: 'Total Users', value: metrics().totalUsers, color: '#0D0D2A' },
    { label: 'Photographers', value: metrics().totalPhotographers, color: '#FF5E13' },
    { label: 'Customers', value: metrics().totalCustomers, color: '#059669' },
    { label: 'Companies', value: metrics().totalCompanies, color: '#7C3AED' },
    { label: 'Job Seekers', value: metrics().totalJobSeekers, color: '#DC2626' },
    { label: 'Pending Verifications', value: metrics().pendingVerifications, color: '#D97706' },
  ]);

  return (
    <div style={{ display: 'grid', gap: '14px', 'max-width': '1200px' }}>
      <div style={CARD}>
        <p style={{ margin: '0', 'font-size': '18px', 'font-weight': '800', color: '#111827' }}>
          Admin Dashboard
        </p>
        <p style={{ margin: '4px 0 0', 'font-size': '13px', color: '#6B7280' }}>
          Platform overview and management metrics.
        </p>
      </div>

      <Show when={error()}>
        <div
          style={{
            ...CARD,
            border: '1px solid #FECACA',
            background: '#FEF2F2',
            padding: '12px 14px',
            color: '#B91C1C',
            'font-size': '13px',
            'font-weight': '600',
          }}
        >
          {error()}
        </div>
      </Show>

      <Show when={loading()}>
        <div style={{ ...CARD, 'text-align': 'center', color: '#9CA3AF' }}>
          Loading admin metrics...
        </div>
      </Show>

      <Show when={!loading()}>
        <div
          style={{
            display: 'grid',
            'grid-template-columns': 'repeat(3, minmax(0, 1fr))',
            gap: '14px',
          }}
        >
          <For each={statCards()}>
            {(stat) => (
              <div
                style={{
                  border: '1px solid #E5E7EB',
                  background: 'white',
                  'border-radius': '16px',
                  padding: '16px',
                  'box-shadow': '0 1px 4px rgba(0,0,0,0.06)',
                }}
              >
                <p
                  style={{
                    margin: '0',
                    'font-size': '11px',
                    'letter-spacing': '0.06em',
                    'text-transform': 'uppercase',
                    color: '#6B7280',
                  }}
                >
                  {stat.label}
                </p>
                <p
                  style={{
                    margin: '8px 0 0',
                    'font-size': '32px',
                    'font-weight': '800',
                    color: stat.color,
                  }}
                >
                  {stat.value}
                </p>
              </div>
            )}
          </For>
        </div>

        <div
          style={{
            border: '1px solid #E5E7EB',
            background: 'white',
            'border-radius': '16px',
            padding: '16px',
            'box-shadow': '0 1px 4px rgba(0,0,0,0.06)',
          }}
        >
          <p
            style={{
              margin: '0 0 12px',
              'font-size': '16px',
              'font-weight': '700',
              color: '#111827',
            }}
          >
            Quick Actions
          </p>
          <div style={{ display: 'flex', gap: '10px', 'flex-wrap': 'wrap' }}>
            <button
              type="button"
              onClick={() => (window.location.href = '/admin/users')}
              style={BTN_PRIMARY}
            >
              Manage Users
            </button>
            <button
              type="button"
              onClick={() => (window.location.href = '/admin/verifications')}
              style={BTN_GHOST}
            >
              Pending Verifications
            </button>
            <button
              type="button"
              onClick={() => (window.location.href = '/admin/roles')}
              style={BTN_GHOST}
            >
              Manage Roles
            </button>
            <button
              type="button"
              onClick={loadAdminMetrics}
              style={BTN_GHOST}
            >
              Refresh
            </button>
          </div>
        </div>
      </Show>
    </div>
  );
}