---
import Layout from '../layouts/Layout.astro';
import { API_BASE as apiBase } from '../lib/api';

function isEnabled(v: string | undefined): boolean {
  if (!v) return false;
  const n = v.trim().toLowerCase();
  return n === '1' || n === 'true' || n === 'yes' || n === 'on';
}

const publicDemoSite = isEnabled((globalThis as any).process?.env?.PUBLIC_DEMO_SITE);
---

<Layout title="Settings">
  <section class="settings-page">
    <h1>Settings</h1>
    
    <div id="settings-content">
      <p class="loading">Loading...</p>
    </div>
  </section>
</Layout>

<script define:vars={{ apiBase, publicDemoSite }}>
  import { getAllThemes, loadSavedTheme, saveTheme } from '../lib/themes';

  const token = localStorage.getItem('token');
  
  if (!token) {
    window.location.href = '/login';
  }

  async function loadSettings() {
    const container = document.getElementById('settings-content');
    if (!container) return;

    try {
      const res = await fetch(`${apiBase}/api/auth/me`, {
        headers: { 'Authorization': `Bearer ${token}` },
      });
      
      if (res.status === 401) {
        window.location.href = '/login';
        return;
      }

      if (!res.ok) {
        throw new Error('Failed to load settings');
      }

      const user = await res.json();

      let appearanceHtml = '';
      if (publicDemoSite) {
        appearanceHtml = `
          <div class="form-section ui-card ui-card-pad-lg ui-form">
            <h2>Appearance</h2>
            <p class="hint">On the public demo, appearance is managed by the instance administrator.</p>
          </div>
        `;
      } else {
        const currentTheme = loadSavedTheme();
        const themeOptions = getAllThemes()
          .map((t) => {
            const selected = t.id === currentTheme ? 'selected' : '';
            return `<option value="${t.id}" ${selected}>${t.name}</option>`;
          })
          .join('');

        appearanceHtml = `
          <div class="form-section ui-card ui-card-pad-lg ui-form">
            <h2>Appearance</h2>
            
            <div class="form-group">
              <label for="theme-select">Theme</label>
              <select id="theme-select" class="theme-select">
                ${themeOptions}
              </select>
              <p class="hint">Choose a visual theme for the interface</p>
            </div>

            <div id="theme-preview" class="theme-preview">
              <div class="preview-colors">
                <span class="preview-swatch preview-bg" title="Background"></span>
                <span class="preview-swatch preview-surface" title="Surface"></span>
                <span class="preview-swatch preview-primary" title="Primary"></span>
                <span class="preview-swatch preview-success" title="Success"></span>
                <span class="preview-swatch preview-error" title="Error"></span>
              </div>
            </div>
          </div>
        `;
      }

      container.innerHTML = `
        ${appearanceHtml}

        <form id="profile-form" class="settings-form">
          <div class="form-section ui-card ui-card-pad-lg ui-form">
            <h2>Profile</h2>
            
            <div class="form-group">
              <label for="username">Username</label>
              <input type="text" id="username" value="${user.username}" disabled />
              <p class="hint">Username cannot be changed</p>
            </div>

            <div class="form-group">
              <label for="display_name">Display Name</label>
              <input type="text" id="display_name" value="${user.display_name || ''}" placeholder="Enter display name" />
            </div>

            <button type="submit" class="ui-btn ui-btn-primary settings-save-btn">Save Changes</button>
          </div>
        </form>

        <div class="form-section ui-card ui-card-pad-lg danger-zone">
          <h2>Account</h2>
          <p class="hint">Logged in as @${user.username}</p>
          <button id="logout-btn" class="ui-btn ui-btn-danger settings-logout-btn" type="button">Logout</button>
        </div>
      `;

      if (!publicDemoSite) {
        setupThemeSwitcher();
      }

      document.getElementById('profile-form')?.addEventListener('submit', async (e) => {
        e.preventDefault();
        const displayName = (document.getElementById('display_name')).value;
        
        const btn = e.target.querySelector('button[type="submit"]');
        btn.disabled = true;
        btn.textContent = 'Saving...';

        try {
          const res = await fetch(`${apiBase}/api/users/me/profile`, {
            method: 'PUT',
            headers: {
              'Content-Type': 'application/json',
              'Authorization': `Bearer ${token}`,
            },
            body: JSON.stringify({ display_name: displayName || null }),
          });

          if (res.status === 401) {
            window.location.href = '/login';
            return;
          }

          if (res.ok) {
            btn.textContent = 'Saved!';
            setTimeout(() => { btn.textContent = 'Save Changes'; btn.disabled = false; }, 2000);
          } else {
            throw new Error('Failed to save');
          }
        } catch (e) {
          btn.textContent = 'Error';
          btn.disabled = false;
        }
      });

      document.getElementById('logout-btn')?.addEventListener('click', () => {
        localStorage.removeItem('token');
        localStorage.removeItem('user');
        window.location.href = '/';
      });

    } catch (error) {
      container.innerHTML = '<div class="error">Failed to load settings</div>';
    }
  }

  function setupThemeSwitcher() {
    if (publicDemoSite) return;

    function updatePreview() {
      const previewBg = document.querySelector('.preview-bg');
      const previewSurface = document.querySelector('.preview-surface');
      const previewPrimary = document.querySelector('.preview-primary');
      const previewSuccess = document.querySelector('.preview-success');
      const previewError = document.querySelector('.preview-error');
      
      if (previewBg) previewBg.style.background = getComputedStyle(document.documentElement).getPropertyValue('--color-bg');
      if (previewSurface) previewSurface.style.background = getComputedStyle(document.documentElement).getPropertyValue('--color-surface');
      if (previewPrimary) previewPrimary.style.background = getComputedStyle(document.documentElement).getPropertyValue('--color-primary');
      if (previewSuccess) previewSuccess.style.background = getComputedStyle(document.documentElement).getPropertyValue('--color-success');
      if (previewError) previewError.style.background = getComputedStyle(document.documentElement).getPropertyValue('--color-error');
    }

    const select = document.getElementById('theme-select');
    if (select) {
      select.addEventListener('change', (e) => {
        const themeId = (e.target).value;
        saveTheme(themeId);
        window.location.reload();
      });
    }

    updatePreview();
  }

  loadSettings();
</script>

<style>
  .settings-page {
    padding: 2rem 0;
    max-width: 500px;
    width: 100%;
    margin: 0 auto;
    --ui-form-group-mb: 1.25rem;
  }

  h1 {
    font-size: 2rem;
    margin-bottom: 2rem;
  }

  @media (max-width: 640px) {
    .settings-page {
      padding: 1.5rem 0;
    }

    h1 {
      font-size: 1.75rem;
      margin-bottom: 1.5rem;
    }
  }

  .settings-form {
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

  .form-section {
    border-radius: 12px;
    margin-bottom: 1.5rem;
  }

  .form-section h2 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
  }

  .hint {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
  }

  .settings-save-btn {
    width: 100%;
  }

  .danger-zone {
    border-color: var(--color-error);
  }

  .settings-logout-btn {
    margin-top: 0.5rem;
  }

  .loading, .error {
    text-align: center;
    padding: 2rem;
    color: var(--color-text-muted);
  }

  .theme-select {
    cursor: pointer;
  }

  .theme-preview {
    margin-top: 1rem;
    padding: 0.75rem;
    background: var(--color-bg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
  }

  .preview-colors {
    display: flex;
    gap: 0.5rem;
  }

  .preview-swatch {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    transition: transform 0.15s ease;
  }

  .preview-swatch:hover {
    transform: scale(1.1);
  }
</style>