import { isResSent } from "../shared/lib/utils";
import { generateETag } from "./lib/etag";
import fresh from "next/dist/compiled/fresh";
import { formatRevalidate } from "./lib/revalidate";
import { RSC_CONTENT_TYPE_HEADER } from "../client/components/app-router-headers";
export function sendEtagResponse(req, res, etag) {
    if (etag) {
        /**
     * The server generating a 304 response MUST generate any of the
     * following header fields that would have been sent in a 200 (OK)
     * response to the same request: Cache-Control, Content-Location, Date,
     * ETag, Expires, and Vary. https://tools.ietf.org/html/rfc7232#section-4.1
     */ res.setHeader("ETag", etag);
    }
    if (fresh(req.headers, {
        etag
    })) {
        res.statusCode = 304;
        res.end();
        return true;
    }
    return false;
}
export async function sendRenderResult({ req, res, result, type, generateEtags, poweredByHeader, revalidate, swrDelta }) {
    if (isResSent(res)) {
        return;
    }
    if (poweredByHeader && type === "html") {
        res.setHeader("X-Powered-By", "Next.js");
    }
    if (typeof revalidate !== "undefined") {
        res.setHeader("Cache-Control", formatRevalidate({
            revalidate,
            swrDelta
        }));
    }
    const payload = result.isDynamic ? null : result.toUnchunkedString();
    if (payload !== null) {
        const etag = generateEtags ? generateETag(payload) : undefined;
        if (sendEtagResponse(req, res, etag)) {
            return;
        }
    }
    if (!res.getHeader("Content-Type")) {
        res.setHeader("Content-Type", result.contentType ? result.contentType : type === "rsc" ? RSC_CONTENT_TYPE_HEADER : type === "json" ? "application/json" : "text/html; charset=utf-8");
    }
    if (payload) {
        res.setHeader("Content-Length", Buffer.byteLength(payload));
    }
    if (req.method === "HEAD") {
        res.end(null);
        return;
    }
    if (payload !== null) {
        res.end(payload);
        return;
    }
    // Pipe the render result to the response after we get a writer for it.
    await result.pipeToNodeResponse(res);
}

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