import { NextRequest, NextResponse } from "next/server";
import { geminiGenerate } from "@/lib/gemini";

export const dynamic = "force-dynamic";

/**
 * Translate arbitrary text to a target language. Used for per-message
 * translation and composer "translate before send". Server-side Gemini only.
 */
export async function POST(req: NextRequest) {
  const body = await req.json().catch(() => ({}));
  const text: string = (body.text ?? "").toString();
  const targetLang: string = (body.targetLang ?? "").toString().trim();

  if (!text.trim()) return NextResponse.json({ ok: false, error: "Nothing to translate." }, { status: 400 });
  if (!targetLang) return NextResponse.json({ ok: false, error: "No target language." }, { status: 400 });

  const result = await geminiGenerate(
    `Translate the following text into ${targetLang}. Preserve markdown, emoji, @mentions and #channel references exactly. ` +
      `Return ONLY the translated text with no quotes, notes, or preamble.\n\n${text}`,
    {
      system: "You are a professional translator. Output only the translation.",
      temperature: 0.2,
    },
  );

  if (!result.ok) {
    return NextResponse.json({ ok: false, error: result.error, retryable: result.retryable }, { status: result.status || 502 });
  }
  return NextResponse.json({ ok: true, text: result.text });
}