import { NextApiHandler } from "next";
import NextCors from "nextjs-cors";
import { replicateTranslate } from "@utils/replicate-translate";
import { readSettings } from "@utils/settings-store";

type Data = { translation: string } | { error: string };

const handler: NextApiHandler<Data> = async (req, res) => {
    await NextCors(req, res, { methods: ["POST"], origin: "*" });

    if (req.method !== "POST") {
        res.setHeader("Allow", ["POST"]);
        return res.status(405).json({ error: "Method Not Allowed" });
    }

    const settings = readSettings();
    if (!settings.replicateEnabled) {
        return res.status(503).json({ error: "Replicate translation is not enabled" });
    }

    const { text, targetLanguage } = req.body ?? {};
    if (!text || typeof text !== "string") {
        return res.status(400).json({ error: "text is required" });
    }
    if (!targetLanguage || typeof targetLanguage !== "string") {
        return res.status(400).json({ error: "targetLanguage is required" });
    }

    try {
        const translation = await replicateTranslate(text, targetLanguage);
        return res.status(200).json({ translation });
    } catch (err) {
        const msg = err instanceof Error ? err.message : "Translation failed";
        return res.status(500).json({ error: msg });
    }
};

export default handler;