/**
 * themes.js - Theme management system
 */

const STORAGE_KEY_THEME = 'selected-theme';

const themes = {
  dark: {
    name: 'Dark (Default)',
    primary: '#1a1a2e',
    secondary: '#16213e',
    accent: '#0f3460',
    text: '#e4e4e4',
    textMuted: '#a0a0a0',
    border: '#2a2a3e',
    cardBg: 'rgba(30, 30, 46, 0.7)',
    headerBg: 'rgba(26, 26, 46, 0.85)',
    overlayBg: 'rgba(60, 60, 60, 0.35)'
  },
  light: {
    name: 'Light',
    primary: '#f5f5f5',
    secondary: '#ffffff',
    accent: '#3498db',
    text: '#2c3e50',
    textMuted: '#7f8c8d',
    border: '#dfe6e9',
    cardBg: 'rgba(255, 255, 255, 0.85)',
    headerBg: 'rgba(245, 245, 245, 0.95)',
    overlayBg: 'rgba(255, 255, 255, 0.15)'
  },
  ocean: {
    name: 'Ocean',
    primary: '#0a1828',
    secondary: '#1a2332',
    accent: '#178582',
    text: '#e0f4f4',
    textMuted: '#8ab4b4',
    border: '#1a3a3a',
    cardBg: 'rgba(26, 35, 50, 0.75)',
    headerBg: 'rgba(10, 24, 40, 0.9)',
    overlayBg: 'rgba(23, 133, 130, 0.15)'
  },
  sunset: {
    name: 'Sunset',
    primary: '#1a0f1e',
    secondary: '#2a1b2e',
    accent: '#d4477a',
    text: '#fce9e9',
    textMuted: '#c4a4b4',
    border: '#3a2a3e',
    cardBg: 'rgba(42, 27, 46, 0.75)',
    headerBg: 'rgba(26, 15, 30, 0.9)',
    overlayBg: 'rgba(212, 71, 122, 0.15)'
  },
  forest: {
    name: 'Forest',
    primary: '#0f1a0f',
    secondary: '#1a2a1a',
    accent: '#4a9a4a',
    text: '#e4f4e4',
    textMuted: '#a4c4a4',
    border: '#2a3a2a',
    cardBg: 'rgba(26, 42, 26, 0.75)',
    headerBg: 'rgba(15, 26, 15, 0.9)',
    overlayBg: 'rgba(74, 154, 74, 0.15)'
  }
};

// Apply theme
function applyTheme(themeName) {
  const theme = themes[themeName] || themes.dark;
  const root = document.documentElement;
  
  root.style.setProperty('--color-primary', theme.primary);
  root.style.setProperty('--color-secondary', theme.secondary);
  root.style.setProperty('--color-accent', theme.accent);
  root.style.setProperty('--color-text', theme.text);
  root.style.setProperty('--color-text-muted', theme.textMuted);
  root.style.setProperty('--color-border', theme.border);
  root.style.setProperty('--color-card-bg', theme.cardBg);
  root.style.setProperty('--color-header-bg', theme.headerBg);
  root.style.setProperty('--color-overlay-bg', theme.overlayBg);
  
  // Save preference
  try {
    localStorage.setItem(STORAGE_KEY_THEME, themeName);
  } catch (e) {
    console.error('Error saving theme:', e);
  }
  
  // Update active state in selector
  document.querySelectorAll('.theme-option').forEach(option => {
    option.classList.toggle('active', option.dataset.theme === themeName);
  });
}

// Load saved theme
function loadSavedTheme() {
  try {
    const saved = localStorage.getItem(STORAGE_KEY_THEME);
    return saved || 'dark';
  } catch (e) {
    console.error('Error loading theme:', e);
    return 'dark';
  }
}

// Create theme selector UI
function createThemeSelector() {
  const selector = document.createElement('div');
  selector.id = 'theme-selector';
  selector.className = 'theme-selector';
  
  const toggle = document.createElement('button');
  toggle.className = 'theme-toggle';
  toggle.innerHTML = '🎨';
  toggle.title = 'Change Theme';
  
  const menu = document.createElement('div');
  menu.className = 'theme-menu';
  
  Object.entries(themes).forEach(([key, theme]) => {
    const option = document.createElement('div');
    option.className = 'theme-option';
    option.dataset.theme = key;
    option.textContent = theme.name;
    
    option.addEventListener('click', () => {
      applyTheme(key);
      menu.classList.remove('open');
    });
    
    menu.appendChild(option);
  });
  
  toggle.addEventListener('click', (e) => {
    e.stopPropagation();
    menu.classList.toggle('open');
  });
  
  // Close menu when clicking outside
  document.addEventListener('click', () => {
    menu.classList.remove('open');
  });
  
  selector.appendChild(toggle);
  selector.appendChild(menu);
  
  return selector;
}

// Initialize theme system
function initThemes() {
  // Apply saved theme
  const savedTheme = loadSavedTheme();
  applyTheme(savedTheme);
  
  // Add theme selector to header
  const header = document.querySelector('header');
  if (header) {
    const selector = createThemeSelector();
    header.appendChild(selector);
  }
}

// Export for use in other modules
window.themesModule = {
  init: initThemes,
  applyTheme: applyTheme,
  themes: themes
};