import { A, useLocation, useNavigate, useSearchParams } from '@solidjs/router';
import { createMemo, createSignal, onMount, type JSX } from 'solid-js';
import AdminSidebar from './AdminSidebar';
import { isExternalIdentity } from '~/lib/admin-auth';
import { clearAdminSession, hasAdminSession, setAdminSession } from '~/lib/admin-session';
import { sidebarCollapsed } from '~/lib/sidebar-state';

type Tab = { href: string; label: string; exact?: boolean };

const TAB_SETS: Array<{ prefixes: string[]; tabs: Tab[] }> = [
  {
    prefixes: ['/admin/roles'],
    tabs: [
      { href: '/admin/roles', label: 'Internal Roles', exact: true },
      { href: '/admin/roles/create', label: 'Create Role' },
      { href: '/admin/roles/templates', label: 'Role Templates' },
    ],
  },
  {
    prefixes: ['/admin/runtime-roles'],
    tabs: [
      { href: '/admin/runtime-roles', label: 'External Roles', exact: true },
      { href: '/admin/runtime-roles/new', label: 'Create External Role' },
    ],
  },
  {
    prefixes: ['/admin/onboarding-schemas'],
    tabs: [
      { href: '/admin/onboarding-schemas', label: 'Onboarding Flows', exact: true },
      { href: '/admin/onboarding-schemas/new', label: 'Create Flow' },
    ],
  },
  {
    prefixes: ['/admin/internal-dashboard-management'],
    tabs: [
      { href: '/admin/internal-dashboard-management', label: 'Internal Dashboards' },
    ],
  },
  {
    prefixes: ['/admin/external-dashboard-management'],
    tabs: [
      { href: '/admin/external-dashboard-management', label: 'External Dashboards' },
    ],
  },
  {
    prefixes: ['/admin/role-ui-configs'],
    tabs: [
      { href: '/admin/role-ui-configs', label: 'Config Inspector', exact: true },
      { href: '/admin/role-ui-configs/new', label: 'Create Config' },
    ],
  },
];

const PAGE_TITLES: Array<{ prefix: string; title: string }> = [
  { prefix: '/admin/workspace', title: 'Dashboard Workspace' },
  { prefix: '/admin/settings', title: 'Settings' },
  { prefix: '/admin/role-modules', title: 'Role Modules' },
  { prefix: '/admin/modules', title: 'Module Management' },
  { prefix: '/admin/responses', title: 'Lead Responses' },
  { prefix: '/admin/applications', title: 'Applications' },
  { prefix: '/admin/financial', title: 'Financial Management' },
  { prefix: '/admin/help', title: 'Support Management' },
  { prefix: '/admin/verification-status', title: 'Verification Status' },
  { prefix: '/admin/verification', title: 'Verification Review' },
  { prefix: '/admin/approval', title: 'Approval Management' },
  { prefix: '/admin/users', title: 'Users Management' },
  { prefix: '/admin/company', title: 'Company Management' },
  { prefix: '/admin/customer', title: 'Customer Management' },
  { prefix: '/admin/candidate', title: 'Candidate Management' },
  { prefix: '/admin/photographer', title: 'Photographer Management' },
  { prefix: '/admin/makeup-artist', title: 'Makeup Artist Management' },
  { prefix: '/admin/tutors', title: 'Tutors Management' },
  { prefix: '/admin/developers', title: 'Developers Management' },
  { prefix: '/admin/graphic-designers', title: 'Graphics Designer Management' },
  { prefix: '/admin/jobs', title: 'Jobs Management' },
  { prefix: '/admin/leads', title: 'Leads Management' },
  { prefix: '/admin/pricing', title: 'Pricing Management' },
  { prefix: '/admin/invoice', title: 'Invoice Management' },
  { prefix: '/admin/credit', title: 'Credit Management' },
  { prefix: '/admin/ledger', title: 'Ledger Management' },
  { prefix: '/admin/report', title: 'Report Management' },
  { prefix: '/admin/employees', title: 'Employee Management' },
  { prefix: '/admin/roles', title: 'Internal Role Management' },
  { prefix: '/admin/external-role-management', title: 'External Role Management' },
  { prefix: '/admin/internal-role-management', title: 'Internal Role Management' },
  { prefix: '/admin/runtime-roles', title: 'External Role Management' },
  { prefix: '/admin/onboarding-management', title: 'External Onboarding Management' },
  { prefix: '/admin/onboarding-schemas', title: 'External Onboarding Management' },
  { prefix: '/admin/kb', title: 'KB Management' },
  { prefix: '/admin', title: 'Dashboard' },
];

export default function AdminShell(props: { children: JSX.Element }) {
  const location = useLocation();
  const navigate = useNavigate();
  const [searchParams] = useSearchParams();
  const [checkedSession, setCheckedSession] = createSignal(false);

  const tabs = createMemo<Tab[]>(() => {
    const path = location.pathname;
    for (const set of TAB_SETS) {
      if (set.prefixes.some((p) => path === p || path.startsWith(`${p}/`))) {
        return set.tabs;
      }
    }
    return [];
  });

  const isTabActive = (tab: Tab) => {
    if (tab.exact) return location.pathname === tab.href;
    return location.pathname === tab.href || location.pathname.startsWith(`${tab.href}/`);
  };

  const pageTitle = createMemo(() => {
    const path = location.pathname;
    for (const item of PAGE_TITLES) {
      if (path === item.prefix || path.startsWith(`${item.prefix}/`)) return item.title;
    }
    return 'Dashboard';
  });

  onMount(() => {
    // ?_preview=1 or sessionStorage flag — bypass auth for UI testing without a live backend.
    // Sets the session cookie AND a sessionStorage flag so all subsequent pages in this tab
    // also skip the API check without needing ?_preview=1 in every URL.
    const isPreview =
      searchParams._preview === '1' ||
      (typeof sessionStorage !== 'undefined' && sessionStorage.getItem('nxtgauge_admin_preview') === '1');

    if (isPreview) {
      if (typeof sessionStorage !== 'undefined') sessionStorage.setItem('nxtgauge_admin_preview', '1');
      setAdminSession();
      setCheckedSession(true);
      return;
    }

    const verify = async () => {
      if (!hasAdminSession()) {
        const from = encodeURIComponent(location.pathname + location.search);
        navigate(`/login?from=${from}`, { replace: true });
        return;
      }

      try {
        const response = await fetch('/api/gateway/users/auth/me', {
          method: 'GET',
          headers: {
            Accept: 'application/json',
            'x-portal-target': 'admin',
          },
          credentials: 'include',
        });
        const payload = await response.json().catch(() => ({}));
        if (!response.ok || isExternalIdentity(payload)) {
          throw new Error('Unauthorized');
        }
        setCheckedSession(true);
      } catch {
        clearAdminSession();
        const from = encodeURIComponent(location.pathname + location.search);
        navigate(`/login?from=${from}`, { replace: true });
      }
    };

    void verify();
  });

  const onLogout = async () => {
    await fetch('/api/gateway/users/auth/logout', {
      method: 'POST',
      headers: {
        Accept: 'application/json',
        'x-portal-target': 'admin',
      },
      credentials: 'include',
    }).catch(() => {});

    clearAdminSession();
    navigate('/login', { replace: true });
  };

  return (
    <div class="admin-root">
      <header class="admin-header">
        <div class="admin-header-inner">
          <div class="admin-header-left">
            <div class="admin-brand">
              <img src="/nxtgauge-logo.png" alt="NXTGAUGE" />
            </div>
            <h1 class="admin-page-heading">{pageTitle()}</h1>
          </div>
          <div class="admin-header-actions">
            <p class="admin-role-chip">Super Admin</p>
            <button class="admin-avatar-btn" type="button" aria-label="Admin profile">
              <span class="admin-avatar">A</span>
              <span class="admin-avatar-meta">
                <span class="admin-avatar-name">Admin</span>
                <span class="admin-avatar-role">Super Admin</span>
              </span>
            </button>
            <button class="admin-logout-btn" type="button" onClick={onLogout} aria-label="Logout">
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
                <path strokeLinecap="round" strokeLinejoin="round" d="M17 16l4-4m0 0l-4-4m4 4H9m4 4v1a3 3 0 01-3 3H6a3 3 0 01-3-3V7a3 3 0 013-3h4a3 3 0 013 3v1" />
              </svg>
            </button>
          </div>
        </div>
      </header>

      {checkedSession() ? (
        <div class={`shell${sidebarCollapsed() ? ' sidebar-collapsed' : ''}`}>
          <AdminSidebar />
          <main class="main">
            {tabs().length > 0 ? (
              <div class="admin-tab-wrap">
                <nav class="admin-tabs">
                  {tabs().map((tab) => (
                    <A href={tab.href} class={`admin-tab ${isTabActive(tab) ? 'active' : ''}`}>
                      {tab.label}
                    </A>
                  ))}
                </nav>
              </div>
            ) : null}
            <div class="main-inner">{props.children}</div>
          </main>
        </div>
      ) : (
        <div class="shell">
          <main class="main">
            <div class="card">
              <p class="notice">Checking session...</p>
            </div>
          </main>
        </div>
      )}
    </div>
  );
}