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path: root/src/lib/components/ThemeToggle.svelte
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<script lang="ts">
    import { browser } from "$app/environment";

    function getInitialTheme(): "light" | "dark" {
        if (browser) {
            const stored = localStorage.getItem("theme");
            if (stored === "light" || stored === "dark") return stored;
            return window.matchMedia("(prefers-color-scheme: dark)").matches
                ? "dark"
                : "light";
        }
        return "light";
    }

    let theme = $state<"light" | "dark">(getInitialTheme());

    function applyTheme(newTheme: "light" | "dark") {
        if (browser) {
            document.documentElement.setAttribute("data-theme", newTheme);
            localStorage.setItem("theme", newTheme);
        }
    }

    $effect(() => {
        applyTheme(theme);
    });

    function toggleTheme() {
        theme = theme === "light" ? "dark" : "light";
    }
</script>

<button
    class="theme-toggle"
    onclick={toggleTheme}
    aria-label={theme === "light"
        ? "Switch to dark mode"
        : "Switch to light mode"}
    title={theme === "light" ? "Switch to dark mode" : "Switch to light mode"}
>
    {#if theme === "light"}
        <svg
            xmlns="http://www.w3.org/2000/svg"
            width="20"
            height="20"
            viewBox="0 0 24 24"
            fill="none"
            stroke="currentColor"
            stroke-width="2"
            stroke-linecap="round"
            stroke-linejoin="round"
        >
            <path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path>
        </svg>
    {:else}
        <svg
            xmlns="http://www.w3.org/2000/svg"
            width="20"
            height="20"
            viewBox="0 0 24 24"
            fill="none"
            stroke="currentColor"
            stroke-width="2"
            stroke-linecap="round"
            stroke-linejoin="round"
        >
            <circle cx="12" cy="12" r="5"></circle>
            <line x1="12" y1="1" x2="12" y2="3"></line>
            <line x1="12" y1="21" x2="12" y2="23"></line>
            <line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line>
            <line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line>
            <line x1="1" y1="12" x2="3" y2="12"></line>
            <line x1="21" y1="12" x2="23" y2="12"></line>
            <line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line>
            <line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line>
        </svg>
    {/if}
</button>