<script>
  const rootEl = typeof document !== 'undefined' ? document.documentElement : null;
  const themes = ['light', 'dark'];
  let theme = ''

  if (typeof localStorage !== 'undefined' && localStorage.getItem('theme')) {
    theme = localStorage.getItem('theme');
  } else if (typeof window !== 'undefined' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
    theme = 'dark';
  }

  function handleChange(event) {
    theme = event.target.value;
    localStorage.setItem('theme', theme);
  }

  $: if (rootEl && theme === 'light') {
    rootEl.classList.remove('theme-dark');
  } else if (rootEl && theme === 'dark') {
    rootEl.classList.add('theme-dark');
  }

  const icons = [
    `<svg
      xmlns="http://www.w3.org/2000/svg"
      width="20"
      height="20"
      viewBox="0 0 20 20"
      fill="currentColor"
    >
      <path
        fill-rule="evenodd"
        d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z"
        clip-rule="evenodd"
      />
    </svg>`,
    `<svg
      xmlns="http://www.w3.org/2000/svg"
      width="20"
      height="20"
      viewBox="0 0 20 20"
      fill="currentColor"
    >
      <path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z" />
    </svg>`,
  ];
</script>


<div class="theme-toggle">
  {#each themes as t, i}
    <label class={theme === t ? 'checked' : ''}>
      {@html icons[i]}
      <input
        type="radio"
        name="theme-toggle"
        checked={theme === t}
        value={t}
        title={`Use ${t} theme`}
        aria-label={`Use ${t} theme`}
        on:change={handleChange}
      />
    </label>
  {/each}
</div>
