import { describe, expect, test } from "bun:test";
import {
  injectPrecacheManifest,
  PRECACHE_PLACEHOLDER,
  precachePathsFromOutputs,
  VERSION_PLACEHOLDER,
} from "../src/pwa/precache";

describe("precachePathsFromOutputs", () => {
  test("maps index.html to /, prefixes assets, drops sourcemaps", () => {
    expect(
      precachePathsFromOutputs(
        ["index.html", "chunk-abc123.js", "chunk-abc123.js.map", "./index-def456.css"],
        ["inference.worker.js"],
      ),
    ).toEqual(["./", "chunk-abc123.js", "index-def456.css", "inference.worker.js"]);
  });

  test("deduplicates and sorts", () => {
    expect(precachePathsFromOutputs(["a.js", "a.js"], ["a.js", "./"])).toEqual([
      "./",
      "a.js",
    ]);
  });
});

describe("injectPrecacheManifest", () => {
  const swSource = `const PRECACHE = JSON.parse(${PRECACHE_PLACEHOLDER});\nconst CACHE = "shell-${VERSION_PLACEHOLDER}";`;

  test("injects a JSON-parseable asset list and the version", () => {
    const result = injectPrecacheManifest(swSource, ["/", "/chunk-abc.js"], "v1abc");
    expect(result).toContain('"shell-v1abc"');
    expect(result).not.toContain("__PRECACHE_MANIFEST__");
    // The injected literal must survive a JS string round-trip back to the array.
    const literal = /JSON\.parse\((".*")\)/.exec(result)?.[1];
    expect(literal).toBeDefined();
    expect(JSON.parse(JSON.parse(literal!))).toEqual(["/", "/chunk-abc.js"]);
  });

  test("throws if a placeholder is missing (bundler mangled the source)", () => {
    expect(() => injectPrecacheManifest("const x = 1;", [], "v1")).toThrow(
      /missing/,
    );
    expect(() =>
      injectPrecacheManifest(`JSON.parse(${PRECACHE_PLACEHOLDER})`, [], "v1"),
    ).toThrow(/missing/);
  });

  test("rejects versions that would break the cache name", () => {
    expect(() => injectPrecacheManifest(swSource, [], "bad version!")).toThrow(
      /Invalid cache version/,
    );
  });

  test("the real sw.ts source contains both placeholders", async () => {
    const source = await Bun.file(
      new URL("../src/pwa/sw.ts", import.meta.url).pathname,
    ).text();
    expect(source).toContain(PRECACHE_PLACEHOLDER);
    expect(source).toContain(VERSION_PLACEHOLDER);
  });
});