import { expect, test } from "@playwright/test";

/**
 * Cluster C Playwright sweep — range-request 206 path. The SW must
 * intercept a packed URL whose cached body exceeds the configured
 * `rangeThreshold` and serve a `206 Partial Content` response when the
 * page issues a fetch carrying a `Range` header. The spec is harness-
 * agnostic and assumes the page exposes a packed asset at
 * `/sample-large.packed`.
 */
test.describe("packed-resource SW range request (cluster C)", () => {
    test("serves 206 Partial Content for a ranged packed request", async ({
        page,
    }) => {
        await page.goto("/");
        await page.evaluate(async () => {
            await navigator.serviceWorker.register("/service-worker.js");
            await navigator.serviceWorker.ready;
        });
        const response = await page.evaluate(async () => {
            const r = await fetch("/sample-large.packed", {
                headers: { Range: "bytes=0-9" },
            });
            return {
                status: r.status,
                contentRange: r.headers.get("Content-Range"),
                acceptRanges: r.headers.get("Accept-Ranges"),
                contentLength: r.headers.get("Content-Length"),
            };
        });
        expect(response.status).toBe(206);
        expect(response.contentRange).toMatch(/^bytes 0-9\/\d+$/);
        expect(response.acceptRanges).toBe("bytes");
        expect(response.contentLength).toBe("10");
    });
});