{{ $style := "light-without-switcher" }}
{{ if and (isset site.Params "style") (ne site.Params.style "") }}
    {{ $style = site.Params.style | lower }}
{{ end }}

{{ if not (in (slice "light-without-switcher" "dark-without-switcher") $style) }}
    {{ if ne "auto-without-switcher" $style }}
        <div class="theme-switcher">
            {{ partial "font-awesome.html" (dict "iconName" "theme-light" "custom" false) }}
        </div>
    {{ end }}

    <script>
        const STORAGE_KEY = 'user-color-scheme'
        const defaultTheme = {{ $style }}

        let currentTheme
        let switchButton
        let autoDefinedScheme = window.matchMedia('(prefers-color-scheme: dark)')

        const autoChangeScheme = e => {
            currentTheme = e.matches ? 'dark' : 'light'
            document.documentElement.setAttribute('data-theme', currentTheme)
        }

        document.addEventListener('DOMContentLoaded', function() {
            switchButton = document.querySelector('.theme-switcher')
            currentTheme = detectCurrentScheme()
            if (currentTheme == 'dark') {
                document.documentElement.setAttribute('data-theme', 'dark')
            }
            if (currentTheme == 'auto') {
                autoChangeScheme(autoDefinedScheme);
                autoDefinedScheme.addListener(autoChangeScheme);
            }

            if (switchButton) {
                switchButton.addEventListener('click', switchTheme, false)
            }
        
            showContent()
        })

        function detectCurrentScheme() {
            if (localStorage !== null && localStorage.getItem(STORAGE_KEY)) {
                return localStorage.getItem(STORAGE_KEY)
            } 
            if (defaultTheme) {
                return defaultTheme
            } 
            if (!window.matchMedia) {
                return 'light'
            } 
            if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
                return 'dark'
            }
            return 'light'
        }

        function switchTheme(e) {
            if (currentTheme == 'dark') {
                if (localStorage !== null)
                    localStorage.setItem(STORAGE_KEY, 'light')
                document.documentElement.setAttribute('data-theme', 'light')
                currentTheme = 'light'
            } else {
                if (localStorage !== null)
                    localStorage.setItem(STORAGE_KEY, 'dark')
                document.documentElement.setAttribute('data-theme', 'dark')
                currentTheme = 'dark'
            }
        }

        function showContent() {
            document.body.style.visibility = 'visible';
            document.body.style.opacity = 1;
        }
    </script>
{{ end }}
