{{define "component/themeSwitchTemplate"}}
<template>
  <a-switch size="small" :default-checked="themeSwitcher.isDarkTheme"
            @change="themeSwitcher.toggleTheme()">
  </a-switch>
</template>
{{end}}

{{define "component/themeSwitcher"}}
<script>
  function createThemeSwitcher() {
    const isDarkTheme = localStorage.getItem('dark-mode') === 'true';
    const theme = isDarkTheme ? 'dark' : 'light';
    document.querySelector('body').setAttribute('class', theme)
    return {
      isDarkTheme,
      get currentTheme() {
        return this.isDarkTheme ? 'dark' : 'light';
      },
      toggleTheme() {
        this.isDarkTheme = !this.isDarkTheme;
        localStorage.setItem('dark-mode', this.isDarkTheme);
        document.querySelector('body').setAttribute('class', this.isDarkTheme ? 'dark' : 'light')
        document.getElementById('message').className = themeSwitcher.currentTheme;
      },
    };
  }

  const themeSwitcher = createThemeSwitcher();

  Vue.component('theme-switch', {
    props: [],
    template: `{{template "component/themeSwitchTemplate"}}`,
    data: () => ({ themeSwitcher }),
    mounted() {
      this.$message.config({getContainer: () => document.getElementById('message')});
      document.getElementById('message').className = themeSwitcher.currentTheme;
    }
  });
</script>
{{end}}

{{define "component/ultraDarkTheme"}}
<script>
  const uthemeToggle = document.getElementById('ultra-dark-theme');
  const isUltraDarkThemeEnabled = localStorage.getItem('isUltraDarkThemeEnabled') === 'true';
  uthemeToggle.checked = isUltraDarkThemeEnabled;
  function ultraToggleTheme() {
      if (uthemeToggle.checked) {
          document.documentElement.setAttribute('data-theme', 'ultra-dark');
          localStorage.setItem('isUltraDarkThemeEnabled', 'true');
      } else {
          document.documentElement.removeAttribute('data-theme');
          localStorage.setItem('isUltraDarkThemeEnabled', 'false');
      }
  }
  uthemeToggle.addEventListener('change', ultraToggleTheme);
  ultraToggleTheme();
  </script>
{{end}}