<script>
  import { onMount, onDestroy } from 'svelte';
  import { push, location } from 'svelte-spa-router';
  import { auth } from './stores/auth.js';
  import { navContext } from './stores/navContext.js';
  import { getProfile } from './api/profile.js';

  $: loc = $location || '';
  $: myDecksActive = loc === '/' || loc === '/decks/new' || /^\/decks\/[^/]+\/edit$/.test(loc) || $navContext === 'my-decks';
  $: communityActive = loc === '/community' || loc.startsWith('/community/') || $navContext === 'community';

  let showPopup = false;
  let mode = 'login'; // 'login' | 'register'
  let email = '';
  let username = '';
  let password = '';
  let submitting = false;
  let registerSuccess = false;
  let userMenuOpen = false;
  let profile = null;
  let profileLoading = false;

  function openPopup() {
    auth.clearError();
    showPopup = true;
    mode = 'login';
    email = '';
    username = '';
    password = '';
    registerSuccess = false;
  }

  function closePopup() {
    showPopup = false;
    email = '';
    username = '';
    password = '';
    registerSuccess = false;
  }

  function handleBackdropClick(e) {
    if (e.target === e.currentTarget) closePopup();
  }

  async function handleSubmit() {
    if (!email.trim() || !password) return;
    submitting = true;
    registerSuccess = false;
    if (mode === 'login') {
      const ok = await auth.login(email.trim(), password);
      if (ok) closePopup();
    } else {
      const result = await auth.register(email.trim(), password, username.trim());
      if (result?.success) {
        if (result.needsConfirmation) {
          registerSuccess = true;
        } else {
          closePopup();
        }
      }
    }
    submitting = false;
  }

  function handleLogout() {
    userMenuOpen = false;
    auth.logout();
    push('/');
  }

  function goSettings(e) {
    if (e) e.preventDefault();
    userMenuOpen = false;
    push('/settings');
  }

  function toggleUserMenu() {
    userMenuOpen = !userMenuOpen;
    if (userMenuOpen && $auth.user?.id && !profileLoading) {
      profileLoading = true;
      getProfile($auth.user.id).then((p) => {
        profile = p;
        profileLoading = false;
      }).catch(() => { profileLoading = false; });
    }
  }

  function handleClickOutside(e) {
    if (userMenuOpen && !e.target.closest('.user-menu-wrap')) userMenuOpen = false;
  }

  $: userId = $auth.user?.id;
  $: if (!$auth.user) {
    profile = null;
    userMenuOpen = false;
  }

  /** Load profile (including avatar) when user is logged in, so avatar shows after refresh */
  $: if (!$auth.loading && $auth.user?.id && !profile && !profileLoading) {
    profileLoading = true;
    getProfile($auth.user.id)
      .then((p) => {
        profile = p;
        profileLoading = false;
      })
      .catch(() => {
        profileLoading = false;
      });
  }

  function onProfileUpdated(e) {
    const p = e?.detail;
    if (p && p.id && $auth.user?.id && p.id === $auth.user.id) {
      profile = p;
    }
  }

  onMount(() => {
    window.addEventListener('profile-updated', onProfileUpdated);
  });

  onDestroy(() => {
    window.removeEventListener('profile-updated', onProfileUpdated);
  });
</script>

<svelte:window on:click={handleClickOutside} />

<nav class="navbar">
  <div class="nav-left">
    <a href="/" class="app-brand" onclick={(e) => { e.preventDefault(); push('/'); }}>
      <img src="/omotomo.png" alt="Omotomo" class="app-logo" width="36" height="36" />
      <span class="app-name">Omotomo</span>
    </a>
    {#if $auth.user}
      <a href="/" class="nav-link" class:active={myDecksActive} onclick={(e) => { e.preventDefault(); push('/'); }}>My decks</a>
    {/if}
    <a href="/community" class="nav-link" class:active={communityActive} onclick={(e) => { e.preventDefault(); push('/community'); }}>Community</a>
  </div>
  <div class="nav-actions">
    {#if $auth.user}
      <button type="button" class="btn btn-primary" onclick={() => push('/decks/new')}>Create deck</button>
    {/if}
    {#if $auth.loading}
      <span class="username">…</span>
    {:else if $auth.user}
      <div class="user-menu-wrap">
        <button
          type="button"
          class="user-menu-trigger"
          onclick={toggleUserMenu}
          aria-haspopup="true"
          aria-expanded={userMenuOpen}
          aria-label="User menu"
        >
          {#if profile?.avatar_url}
            <img src={profile.avatar_url} alt="" class="user-avatar" width="32" height="32" />
          {:else}
            <span class="user-icon" aria-hidden="true">
              <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
                <path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2" />
                <circle cx="12" cy="7" r="4" />
              </svg>
            </span>
          {/if}
        </button>
        {#if userMenuOpen}
          <div class="user-dropdown" role="menu">
            {#if profile}
              <div class="user-dropdown-header">
                <span class="user-dropdown-name">{profile.display_name || profile.email || 'User'}</span>
                <span class="user-dropdown-email">{profile.email}</span>
              </div>
            {/if}
            <a href="/settings" class="user-dropdown-item" role="menuitem" onclick={goSettings}>
              Settings
            </a>
            <button type="button" class="user-dropdown-item user-dropdown-item-logout" role="menuitem" onclick={handleLogout}>
              Logout
            </button>
          </div>
        {/if}
      </div>
    {:else}
      <button type="button" class="btn btn-login" onclick={openPopup}>Login</button>
    {/if}
  </div>
</nav>

{#if showPopup}
  <div class="popup-backdrop" onclick={handleBackdropClick} role="presentation">
    <div class="popup" role="dialog" aria-modal="true" aria-labelledby="auth-popup-title">
      <div class="popup-header">
        <h2 id="auth-popup-title" class="popup-title">{mode === 'login' ? 'Sign in' : 'Register'}</h2>
        <button type="button" class="popup-close" onclick={closePopup} aria-label="Close">×</button>
      </div>

      <div class="popup-tabs">
        <button
          type="button"
          class="tab"
          class:active={mode === 'login'}
          onclick={() => { mode = 'login'; auth.clearError(); registerSuccess = false; }}
        >
          Log in
        </button>
        <button
          type="button"
          class="tab"
          class:active={mode === 'register'}
          onclick={() => { mode = 'register'; auth.clearError(); registerSuccess = false; }}
        >
          Register
        </button>
      </div>

      {#if registerSuccess && !$auth.user}
        <p class="auth-message auth-success">
          Check your email to confirm your account.
        </p>
      {:else}
        <form class="popup-form" onsubmit={(e) => { e.preventDefault(); handleSubmit(); }}>
          <input
            type={mode === 'login' ? 'text' : 'email'}
            bind:value={email}
            placeholder={mode === 'login' ? 'Email or username' : 'Email'}
            class="input"
            disabled={submitting}
            autocomplete={mode === 'login' ? 'username' : 'email'}
          />
          {#if mode === 'register'}
            <input
              type="text"
              bind:value={username}
              placeholder="Username"
              class="input"
              disabled={submitting}
              autocomplete="username"
            />
          {/if}
          <input
            type="password"
            bind:value={password}
            placeholder="Password"
            class="input"
            disabled={submitting}
            autocomplete={mode === 'login' ? 'current-password' : 'new-password'}
          />
          {#if $auth.error}
            <p class="auth-error">{$auth.error}</p>
            {#if mode === 'login'}
              <p class="auth-switch">
                Do you have an account? <button type="button" class="auth-link" onclick={() => { mode = 'register'; auth.clearError(); }}>Register here</button>.
              </p>
            {/if}
          {/if}
          <button
            type="submit"
            class="btn btn-primary btn-block"
            disabled={submitting || !email.trim() || !password}
          >
            {#if submitting}
              {mode === 'login' ? 'Logging in…' : 'Creating account…'}
            {:else}
              {mode === 'login' ? 'Log in' : 'Create account'}
            {/if}
          </button>
        </form>
      {/if}
    </div>
  </div>
{/if}

<style>
  .navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.75rem 1.5rem;
    background: var(--nav-bg, #161616);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  }

  .nav-left {
    display: flex;
    align-items: center;
    gap: 1.25rem;
  }

  .app-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
  }

  .app-logo {
    display: block;
    width: 36px;
    height: 36px;
    object-fit: contain;
    border-radius: 6px;
  }

  .app-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary, #f0f0f0);
    text-decoration: none;
  }

  .app-brand:hover .app-name {
    color: var(--text-primary, #f0f0f0);
  }

  .nav-link {
    font-size: 0.95rem;
    color: var(--text-muted, #a0a0a0);
    text-decoration: none;
  }

  .nav-link:hover {
    color: var(--text-primary, #f0f0f0);
  }

  .nav-link.active {
    color: var(--text-primary, #f0f0f0);
    font-weight: 500;
  }

  .nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .username {
    font-size: 0.9rem;
    color: var(--text-muted, #a0a0a0);
  }

  .user-menu-wrap {
    position: relative;
  }

  .user-menu-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: var(--card-bg, #1e1e1e);
    color: var(--text-muted, #a0a0a0);
    cursor: pointer;
    transition: color 0.2s, background 0.2s, box-shadow 0.2s;
  }

  .user-menu-trigger:hover {
    color: var(--text-primary, #f0f0f0);
    background: var(--hover-bg, #2a2a2a);
  }

  .user-menu-trigger:focus {
    outline: 2px solid var(--accent, #3b82f6);
    outline-offset: 2px;
  }

  .user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
  }

  .user-icon {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .user-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 200px;
    padding: 0.5rem 0;
    background: var(--card-bg, #1a1a1a);
    border: 1px solid var(--border, #333);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 200;
  }

  .user-dropdown-header {
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border, #333);
    margin-bottom: 0.25rem;
  }

  .user-dropdown-name {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary, #f0f0f0);
  }

  .user-dropdown-email {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted, #a0a0a0);
  }

  .user-dropdown-item {
    display: block;
    width: 100%;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    text-align: left;
    border: none;
    background: none;
    color: var(--text-primary, #f0f0f0);
    text-decoration: none;
    cursor: pointer;
    transition: background 0.15s;
  }

  .user-dropdown-item:hover {
    background: var(--hover-bg, #2a2a2a);
  }

  .user-dropdown-item-logout {
    color: var(--text-muted, #a0a0a0);
  }

  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--border, #333);
    border-radius: 6px;
    background: var(--card-bg, #1e1e1e);
    color: var(--text-primary, #f0f0f0);
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
  }

  .btn:hover:not(:disabled) {
    background: var(--hover-bg, #2a2a2a);
    border-color: var(--border-hover, #444);
  }

  .btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
  }

  .btn-login,
  .btn-primary {
    background: var(--accent, #3b82f6);
    border-color: var(--accent, #3b82f6);
  }

  .btn-login:hover:not(:disabled),
  .btn-primary:hover:not(:disabled) {
    background: #2563eb;
    border-color: #2563eb;
  }

  .btn-block {
    width: 100%;
  }

  /* Popup */
  .popup-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
  }

  .popup {
    width: 100%;
    max-width: 380px;
    padding: 1.5rem;
    background: var(--card-bg, #1a1a1a);
    border: 1px solid var(--border, #333);
    border-radius: 12px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  }

  .popup-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
  }

  .popup-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary, #f0f0f0);
  }

  .popup-close {
    width: 2rem;
    height: 2rem;
    padding: 0;
    font-size: 1.5rem;
    line-height: 1;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-muted, #a0a0a0);
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
  }

  .popup-close:hover {
    color: var(--text-primary, #f0f0f0);
    background: var(--hover-bg, #222);
  }

  .popup-tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.25rem;
    padding: 0.25rem;
    background: var(--bg-muted, #252525);
    border-radius: 8px;
  }

  .tab {
    flex: 1;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-muted, #a0a0a0);
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
  }

  .tab:hover {
    color: var(--text-primary, #f0f0f0);
  }

  .tab.active {
    background: var(--card-bg, #1a1a1a);
    color: var(--text-primary, #f0f0f0);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  }

  .popup-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .input {
    width: 100%;
    padding: 0.6rem 0.75rem;
    font-size: 0.95rem;
    border: 1px solid var(--border, #333);
    border-radius: 6px;
    background: var(--bg, #0f0f0f);
    color: var(--text-primary, #f0f0f0);
  }

  .input::placeholder {
    color: var(--text-muted, #a0a0a0);
  }

  .input:focus {
    outline: none;
    border-color: var(--accent, #3b82f6);
  }

  .auth-error {
    margin: 0;
    font-size: 0.85rem;
    color: #ef4444;
  }

  .auth-switch {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-muted, #a0a0a0);
  }

  .auth-link {
    padding: 0;
    font-size: inherit;
    font-weight: 500;
    border: none;
    background: none;
    color: var(--accent, #3b82f6);
    cursor: pointer;
    text-decoration: underline;
  }

  .auth-link:hover {
    color: #60a5fa;
  }

  .auth-message {
    margin: 0;
    font-size: 0.9rem;
  }

  .auth-success {
    color: #22c55e;
  }
</style>
