---

const {
  className: customClass = "",
  id: uniqueId = `themeToggle-${Math.random().toString(36).substr(2, 9)}`
} = Astro.props;

---

<button id={uniqueId} data-theme-toggle aria-label="Toggle theme" class={`flex items-center bg-transparent cursor-pointer border-0 ${customClass}`}>
  <svg width="24px" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
    <path class="moon" fill-rule="evenodd" d="M12 17.5a5.5 5.5 0 1 0 0-11 5.5 5.5 0 0 0 0 11zm0 1.5a7 7 0 1 0 0-14 7 7 0 0 0 0 14zm12-7a.8.8 0 0 1-.8.8h-2.4a.8.8 0 0 1 0-1.6h2.4a.8.8 0 0 1 .8.8zM4 12a.8.8 0 0 1-.8.8H.8a.8.8 0 0 1 0-1.6h2.5a.8.8 0 0 1 .8.8zm16.5-8.5a.8.8 0 0 1 0 1l-1.8 1.8a.8.8 0 0 1-1-1l1.7-1.8a.8.8 0 0 1 1 0zM6.3 17.7a.8.8 0 0 1 0 1l-1.7 1.8a.8.8 0 1 1-1-1l1.7-1.8a.8.8 0 0 1 1 0zM12 0a.8.8 0 0 1 .8.8v2.5a.8.8 0 0 1-1.6 0V.8A.8.8 0 0 1 12 0zm0 20a.8.8 0 0 1 .8.8v2.4a.8.8 0 0 1-1.6 0v-2.4a.8.8 0 0 1 .8-.8zM3.5 3.5a.8.8 0 0 1 1 0l1.8 1.8a.8.8 0 1 1-1 1L3.5 4.6a.8.8 0 0 1 0-1zm14.2 14.2a.8.8 0 0 1 1 0l1.8 1.7a.8.8 0 0 1-1 1l-1.8-1.7a.8.8 0 0 1 0-1z"/>
    <path class="sun" fill-rule="evenodd" d="M16.5 6A10.5 10.5 0 0 1 4.7 16.4 8.5 8.5 0 1 0 16.4 4.7l.1 1.3zm-1.7-2a9 9 0 0 1 .2 2 9 9 0 0 1-11 8.8 9.4 9.4 0 0 1-.8-.3c-.4 0-.8.3-.7.7a10 10 0 0 0 .3.8 10 10 0 0 0 9.2 6 10 10 0 0 0 4-19.2 9.7 9.7 0 0 0-.9-.3c-.3-.1-.7.3-.6.7a9 9 0 0 1 .3.8z"/>
  </svg>
</button>

<style>
  .sun { fill: white; }
  .moon { fill: transparent; }
  :global([data-theme="dark"]) .sun { fill: transparent; }
  :global([data-theme="dark"]) .moon { fill: white; }
</style>

<script>
  // Theme switching functionality
  (function() {
    const themeToggles = document.querySelectorAll('[data-theme-toggle]');
    const html = document.documentElement;
    const THEME_STORAGE_KEY = 'starlight-theme';

    // Function to get user's system preference
    function getSystemTheme() {
      return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
    }

    // Function to get stored theme or system preference
    function getCurrentTheme() {
      const stored = localStorage.getItem(THEME_STORAGE_KEY);
      if (stored === 'light' || stored === 'dark') {
        return stored;
      }
      return getSystemTheme();
    }

    // Function to apply theme
    function applyTheme(theme: any) {
      html.setAttribute('data-theme', theme);
    }

    // Function to set theme and store preference
    function setTheme(theme: any) {
      applyTheme(theme);
      localStorage.setItem(THEME_STORAGE_KEY, theme);
    }

    // Function to toggle theme
    function toggleTheme() {
      const currentTheme = getCurrentTheme();
      const newTheme = currentTheme === 'light' ? 'dark' : 'light';
      setTheme(newTheme);
    }

    // Initialize theme on page load
    function initializeTheme() {
      const theme = getCurrentTheme();
      applyTheme(theme);
    }

    // Listen for system theme changes
    function handleSystemThemeChange(e: any) {
      // Only update if user hasn't set a preference
      if (!localStorage.getItem(THEME_STORAGE_KEY)) {
        const newTheme = e.matches ? 'dark' : 'light';
        applyTheme(newTheme);
      }
    }

    // Add event listeners to all theme toggle buttons
    themeToggles.forEach(toggle => {
      toggle.addEventListener('click', toggleTheme);
    });

    // Listen for system theme changes
    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
    mediaQuery.addEventListener('change', handleSystemThemeChange);

    // Initialize theme immediately for first paint, and again after Astro navigations.
    initializeTheme();
    document.addEventListener('astro:page-load', initializeTheme);
  })();
</script>
