<script lang="ts">
  import { invalidateAll } from '$app/navigation';
  import { page } from '$app/state';
  import { api } from '$lib/api';
  import { adminSession, sessionHydrated } from '$lib/session';

  const navigation = [
    { href: '/admin', label: 'Overview', shortLabel: 'OV' },
    { href: '/admin/client-access', label: 'Client Access', shortLabel: 'CA' }
  ];

  let { children } = $props();
  let isRestoringSession = $state(false);
  let restoredSessionKey = $state<string | null>(null);

  function matchesRoute(href: string, pathname: string) {
    return href === '/admin' ? pathname === '/admin' : pathname.startsWith(href);
  }

  function pageTitle(pathname: string) {
    return navigation.find((item) => matchesRoute(item.href, pathname))?.label ?? 'Overview';
  }

  function initials(name: string) {
    return name
      .split(' ')
      .map((piece) => piece[0])
      .join('')
      .slice(0, 2)
      .toUpperCase();
  }

  async function signOut() {
    try {
      await api.adminLogout();
    } catch {
      // Clearing the local session remains the safe fallback.
    } finally {
      adminSession.clear();
    }
  }

  const isProtectedRoute = $derived(page.url.pathname !== '/admin');

  $effect(() => {
    const hydrated = $sessionHydrated;
    const sessionKey = $adminSession ? `${$adminSession.role}:${$adminSession.email}` : null;

    if (!hydrated) {
      return;
    }

    if (!sessionKey) {
      isRestoringSession = false;
      restoredSessionKey = null;
      return;
    }

    if (restoredSessionKey === sessionKey) {
      return;
    }

    restoredSessionKey = sessionKey;
    isRestoringSession = true;

    invalidateAll().finally(() => {
      if (restoredSessionKey === sessionKey) {
        isRestoringSession = false;
      }
    });
  });
</script>

<svelte:head>
  <title>{pageTitle(page.url.pathname)} | Lean 101 Admin Panel</title>
</svelte:head>

<div class="admin-shell">
  <aside class="admin-sidebar">
    <a class="admin-brand" href="/admin">
      <span class="brand-mark">L1</span>
      <span>Lean 101 Admin Panel</span>
    </a>

    <p class="admin-copy">
      Internal workspace for Lean 101 operators managing client access and controlled workspace changes.
    </p>

    <nav class="admin-nav" aria-label="Admin navigation">
      {#each navigation as item}
        <a class:active={matchesRoute(item.href, page.url.pathname)} href={item.href}>
          <span class="nav-icon">{item.shortLabel}</span>
          <span>{item.label}</span>
        </a>
      {/each}
    </nav>

    <div class="admin-footer">
      <a href="/">Open client workspace</a>
      {#if $adminSession}
        <button type="button" onclick={signOut}>Sign out</button>
      {/if}
    </div>
  </aside>

  <div class="admin-main">
    <header class="admin-topbar">
      <div>
        <p class="eyebrow">Admin Area</p>
        <h1>{pageTitle(page.url.pathname)}</h1>
      </div>

      {#if !$sessionHydrated}
        <div class="profile-card guest">
          <span class="profile-avatar">A</span>
          <div>
            <strong>Checking saved session</strong>
            <span>Restoring admin access</span>
          </div>
        </div>
      {:else if $adminSession}
        <div class="profile-card">
          <span class="profile-avatar">{initials($adminSession.name)}</span>
          <div>
            <strong>{$adminSession.name}</strong>
            <span>{$adminSession.email}</span>
          </div>
        </div>
      {:else}
        <div class="profile-card guest">
          <span class="profile-avatar">A</span>
          <div>
            <strong>Admin sign-in required</strong>
            <span>Use `/admin` to authenticate</span>
          </div>
        </div>
      {/if}
    </header>

    <main class="admin-content">
      {#if isProtectedRoute && (!$sessionHydrated || isRestoringSession)}
        <section class="locked-card loading-card">
          <p class="eyebrow">Checking Session</p>
          <h2>Restoring the Lean 101 admin workspace.</h2>
          <p>Refreshing the current route with the saved operator session before prompting for sign-in.</p>
        </section>
      {:else if isProtectedRoute && !$adminSession}
        <section class="locked-card">
          <p class="eyebrow">Restricted</p>
          <h2>Sign in through the Lean 101 Admin Panel to continue.</h2>
          <p>Client access controls are only available inside the separate admin workspace.</p>
          <a href="/admin">Go to admin sign-in</a>
        </section>
      {:else}
        {@render children()}
      {/if}
    </main>
  </div>
</div>

<style>
  .admin-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    background: var(--color-bg-app);
    color: var(--color-text-primary);
  }

  .admin-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.1rem;
    border-right: 1px solid rgba(34, 54, 45, 0.12);
    background: rgba(20, 29, 24, 0.96);
    color: #f4f7f1;
  }

  .admin-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.05rem;
    font-weight: 700;
  }

  .brand-mark,
  .nav-icon,
  .profile-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 700;
    letter-spacing: 0.04em;
  }

  .brand-mark {
    width: 2rem;
    height: 2rem;
    border-radius: 0.72rem;
    color: #0f1713;
    background: linear-gradient(135deg, #cfe4b8 0%, #83c98b 100%);
  }

  .admin-copy {
    margin: 0;
    color: rgba(244, 247, 241, 0.74);
    line-height: 1.55;
  }

  .admin-nav {
    display: grid;
    gap: 0.4rem;
  }

  .admin-nav a {
    display: flex;
    align-items: center;
    gap: 0.72rem;
    padding: 0.82rem 0.78rem;
    border-radius: 0.9rem;
    color: rgba(244, 247, 241, 0.88);
    transition: background-color 140ms ease;
  }

  .admin-nav a:hover,
  .admin-nav a.active {
    background: rgba(207, 228, 184, 0.16);
  }

  .admin-nav a.active {
    color: #ffffff;
  }

  .nav-icon {
    width: 1.65rem;
    height: 1.65rem;
    border-radius: 0.58rem;
    color: #0f1713;
    background: linear-gradient(135deg, #cfe4b8 0%, #83c98b 100%);
    font-size: 0.7rem;
  }

  .admin-footer {
    margin-top: auto;
    display: grid;
    gap: 0.6rem;
  }

  .admin-footer a,
  .admin-footer button {
    padding: 0.82rem 0.88rem;
    border: 1px solid rgba(244, 247, 241, 0.14);
    border-radius: 0.88rem;
    background: rgba(255, 255, 255, 0.04);
    color: inherit;
    text-align: left;
    cursor: pointer;
  }

  .admin-main {
    min-width: 0;
    display: flex;
    flex-direction: column;
  }

  .admin-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.4rem;
    border-bottom: 1px solid rgba(34, 54, 45, 0.1);
    background: rgba(247, 248, 244, 0.85);
    backdrop-filter: blur(12px);
  }

  .eyebrow {
    margin: 0 0 0.18rem;
    color: #66806e;
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .admin-topbar h1 {
    margin: 0;
    font-size: 1.7rem;
  }

  .profile-card {
    display: flex;
    align-items: center;
    gap: 0.72rem;
    padding: 0.45rem 0.52rem;
    border: 1px solid rgba(34, 54, 45, 0.1);
    border-radius: 0.95rem;
    background: rgba(255, 255, 255, 0.82);
  }

  .profile-avatar {
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 999px;
    color: #ffffff;
    background: linear-gradient(135deg, #4f8860 0%, #203028 100%);
  }

  .profile-card strong,
  .profile-card span {
    display: block;
  }

  .profile-card span {
    margin-top: 0.14rem;
    color: #6b7f72;
    font-size: 0.82rem;
  }

  .guest .profile-avatar {
    background: linear-gradient(135deg, #c4d0c8 0%, #7b8b80 100%);
  }

  .admin-content {
    min-width: 0;
    padding: 1.4rem;
  }

  .locked-card {
    max-width: 42rem;
    padding: 1.35rem;
    border: 1px solid rgba(34, 54, 45, 0.1);
    border-radius: 1.35rem;
    background: rgba(255, 255, 255, 0.82);
    box-shadow: none;
  }

  .loading-card {
    min-height: 10rem;
  }

  .locked-card h2,
  .locked-card p {
    margin: 0;
  }

  .locked-card h2 {
    margin-top: 0.35rem;
    font-size: clamp(1.8rem, 3vw, 2.3rem);
  }

  .locked-card p:last-of-type {
    margin-top: 0.45rem;
    color: #5d7166;
  }

  .locked-card a {
    display: inline-flex;
    margin-top: 1rem;
    padding: 0.82rem 0.95rem;
    border-radius: 0.9rem;
    background: #203028;
    color: #ffffff;
    font-weight: 600;
  }

  @media (max-width: 980px) {
    .admin-shell {
      grid-template-columns: 1fr;
    }

    .admin-sidebar {
      border-right: none;
      border-bottom: 1px solid rgba(34, 54, 45, 0.12);
    }
  }

  @media (max-width: 720px) {
    .admin-topbar {
      flex-direction: column;
      align-items: flex-start;
    }

    .admin-content {
      padding: 1rem;
    }
  }
</style>
