/** 主动切换主题，
 *  @example onclick={toggleTheme}
 */
export const toggleTheme = (event?: { clientX?: number; clientY?: number }, toDark?: boolean) => {
    const isDark =
        document.documentElement.classList.contains("dark") ??
        window?.matchMedia("(prefers-color-scheme: dark)").matches;
    toDark = toDark ?? !document.documentElement.classList.contains("dark");
    const toggleDark = () => {
        document.documentElement.classList[toDark ? "add" : "remove"]("dark");
    };
    const x = event?.clientX ?? innerWidth / 2;
    const y = event?.clientY ?? innerHeight / 2;
    const endRadius = Math.hypot(Math.max(x, innerWidth - x), Math.max(y, innerHeight - y));

    // 兼容性处理
    if (
        /** @ts-ignore */
        !document.startViewTransition ||
        window.matchMedia("(prefers-reduced-motion: reduce)").matches ||
        isDark === toDark
    ) {
        toggleDark();
        return;
    }
    /** @ts-ignore */
    const transition = document.startViewTransition(() => {
        toggleDark();
    });
    transition.ready.then(() => {
        const clipPath = [
            `circle(0px at ${x}px ${y}px)`,
            `circle(${endRadius}px at ${x}px ${y}px)`,
        ];

        document.documentElement.animate(
            {
                clipPath: toDark ? [...clipPath].reverse() : clipPath,
            },
            {
                duration: 500,
                easing: "ease-in",
                pseudoElement: toDark
                    ? "::view-transition-old(root)"
                    : "::view-transition-new(root)",
            },
        );
    });
};