/**
 * COLOR THEME SYSTEM
 * Pure JavaScript implementation (replacing hyperscript due to parsing issues)
 * Handles light/dark/auto theme switching
 */

// Set color theme
function setColorTheme(mode) {
  // Save preference to localStorage
  localStorage.setItem('color-theme-mode', mode);

  // Apply theme to document
  document.documentElement.setAttribute('data-color-theme', mode);

  // Update button icon and color based on mode
  const themeButton = document.querySelector('#color-theme-switcher');
  const themeIcon = document.querySelector('#themeIcon');

  if (themeButton) {
    // Set data attribute for CSS styling
    themeButton.setAttribute('data-theme-mode', mode);
  }

  if (themeIcon) {
    if (mode === 'light') {
      themeIcon.setAttribute('icon', 'mdi:white-balance-sunny');
    } else if (mode === 'dark') {
      themeIcon.setAttribute('icon', 'mdi:moon-waning-crescent');
    } else {
      themeIcon.setAttribute('icon', 'mdi:theme-light-dark');
    }
  }

  // Update button active states (for hidden compatibility buttons)
  const buttons = document.querySelectorAll('.theme-option-btn');
  buttons.forEach(btn => {
    if (btn.getAttribute('data-theme-mode') === mode) {
      btn.classList.add('active');
    } else {
      btn.classList.remove('active');
    }
  });
}

// Initialize color theme
function initColorTheme() {
  // Check if theme was already set by FOUC prevention script
  const existingTheme = document.documentElement.getAttribute('data-color-theme');

  // If theme is already set (by FOUC script), save it to localStorage
  if (existingTheme) {
    // Save the FOUC-detected theme to localStorage
    localStorage.setItem('color-theme-mode', existingTheme);
    setColorTheme(existingTheme);
  } else {
    // Fallback: Get saved preference or default to 'light' (paper aesthetic)
    const savedTheme = localStorage.getItem('color-theme-mode') || 'light';
    setColorTheme(savedTheme);
  }
}

// Setup button click handler
function setupColorThemeButton() {
  const button = document.querySelector('#color-theme-switcher');
  if (button) {
    button.addEventListener('click', () => {
      // Get current theme
      const currentTheme = localStorage.getItem('color-theme-mode') || 'light';

      // Cycle: auto → light → dark → auto
      if (currentTheme === 'auto') {
        setColorTheme('light');
      } else if (currentTheme === 'light') {
        setColorTheme('dark');
      } else {
        setColorTheme('auto');
      }
    });
  }
}

// Watch system theme changes (optional enhancement)
function watchSystemTheme() {
  const darkModeQuery = window.matchMedia('(prefers-color-scheme: dark)');

  darkModeQuery.addEventListener('change', () => {
    const currentMode = localStorage.getItem('color-theme-mode');
    if (currentMode === 'auto' || currentMode === null) {
      // Theme will automatically update via CSS
      // Just ensure the UI reflects the current state
      setColorTheme('auto');
    }
  });
}

// Initialize on DOM ready
if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', () => {
    initColorTheme();
    setupColorThemeButton();
    watchSystemTheme();
  });
} else {
  initColorTheme();
  setupColorThemeButton();
  watchSystemTheme();
}