"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import { toast } from "sonner";
import { MessageCircle } from "lucide-react";
import { Button } from "@/components/ui/button";

export function MessageButton({ targetUsername }: { targetUsername: string }) {
  const router = useRouter();
  const [loading, setLoading] = useState(false);

  async function startConversation() {
    setLoading(true);
    try {
      const res = await fetch("/api/v1/conversations", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ username: targetUsername }),
      });
      if (!res.ok) {
        const err = await res.json() as { error?: string };
        toast.error(err.error ?? "Failed to start conversation");
        return;
      }
      const { conversationId } = await res.json() as { conversationId: string };
      router.push(`/messages/${conversationId}`);
    } finally {
      setLoading(false);
    }
  }

  return (
    <Button variant="outline" size="sm" onClick={() => { void startConversation(); }} disabled={loading}>
      <MessageCircle className="h-3.5 w-3.5" />
      Message
    </Button>
  );
}