"use client";

import { MoonIcon, SunIcon } from "lucide-react";
import { useTheme } from "next-themes";
import * as React from "react";
import { Button } from "@/components/ui/button";
import { cn } from "@/lib/utils";

export function ThemeToggle() {
  const { resolvedTheme, setTheme } = useTheme();
  const [mounted, setMounted] = React.useState(false);

  React.useEffect(() => setMounted(true), []);

  // Avant l'hydratation on affiche le soleil par défaut pour éviter tout
  // mismatch : `mounted` reste false côté serveur comme au premier rendu client.
  const isDark = mounted && resolvedTheme === "dark";

  return (
    <Button
      variant="ghost"
      size="icon"
      aria-label="Changer de thème"
      onClick={() => setTheme(isDark ? "light" : "dark")}
    >
      <span className="relative inline-flex size-5 items-center justify-center">
        <MoonIcon
          aria-hidden
          className={cn(
            "absolute inset-0 size-5 transition-opacity duration-300",
            isDark ? "opacity-0" : "opacity-100",
          )}
        />
        <SunIcon
          aria-hidden
          className={cn(
            "absolute inset-0 size-5 transition-opacity duration-300",
            isDark ? "opacity-100" : "opacity-0",
          )}
        />
      </span>
    </Button>
  );
}