export async function runBrowserOpfsBasicSections(context, simulator) {
  const {
    expectErrorContaining,
    expectEvent,
    expectMissingWasmPath,
    expectText,
    near,
    runSection,
    withSmokeSimulator,
  } = context;

  await runSection("opfs workspace clear and healthcheck", async () => {
    if (!simulator.fs.opfs) {
      throw new Error("expected OPFS workspace to be available in browser smoke");
    }
    await simulator.fs.opfs.clear();
    if (simulator.fs.opfs.workspacePath !== "cnc-simulator-smoke") {
      throw new Error("unexpected OPFS workspace path");
    }
    await simulator.fs.opfs.writeFile("healthcheck.ngc", "G21 G90\n");
    if (!(await simulator.fs.opfs.exists("healthcheck.ngc"))) {
      throw new Error("OPFS exists did not find a persisted file");
    }
    if (await simulator.fs.opfs.exists("missing-healthcheck.ngc")) {
      throw new Error("OPFS exists reported a missing file");
    }
    const healthcheckStat = await simulator.fs.opfs.stat("healthcheck.ngc");
    if (healthcheckStat.kind !== "file" || healthcheckStat.size !== 8) {
      throw new Error("OPFS stat did not report the persisted healthcheck file size");
    }
    const clearCheck = new TextDecoder().decode(await simulator.fs.opfs.readFile("healthcheck.ngc"));
    expectText(clearCheck, "G21 G90\n", "OPFS workspace did not survive clear/write round trip");
  });

  await runSection("opfs default mount check", async () => {
    await withSmokeSimulator((defaultMountSimulator) => {
      if (!defaultMountSimulator.fs.opfs || defaultMountSimulator.fs.opfs.mountPoint !== "/cnc") {
        throw new Error("default OPFS mount point was not preserved");
      }
    });
  });

  await runSection("opfs program write and read", async () => {
    const encoded = new TextEncoder().encode("G21 G90\nG0 X1\n");
    await simulator.fs.opfs.writeFile("programs/browser-smoke.ngc", encoded);
    const decoded = new TextDecoder().decode(
      await simulator.fs.opfs.readFile("programs/browser-smoke.ngc"),
    );
    expectText(decoded, "G21 G90\nG0 X1\n", "OPFS round trip did not preserve browser smoke program");
  });

  await runSection("opfs unsafe path rejection", async () => {
    for (const unsafePath of ["../escape.ngc", "programs/../escape.ngc", "/escape.ngc", "programs//escape.ngc"]) {
      await expectErrorContaining(
        () => simulator.fs.opfs.writeFile(unsafePath, "G21\n"),
        "inside the CNC workspace",
        `OPFS accepted unsafe path ${unsafePath}`,
      );
    }
    for (const [operation, action] of [
      ["readFile", () => simulator.fs.opfs.readFile("../escape.ngc")],
      ["readDirectory", () => simulator.fs.opfs.readDirectory("../escape")],
      ["persistFile", () => simulator.fs.opfs.persistFile("../escape.ngc")],
      ["persistDirectory", () => simulator.fs.opfs.persistDirectory("../escape")],
      ["copyFile", () => simulator.fs.opfs.copyFile("../escape.ngc", "programs/escape.ngc")],
      ["copyFileTarget", () => simulator.fs.opfs.copyFile("healthcheck.ngc", "../escape.ngc")],
      ["exists", () => simulator.fs.opfs.exists("../escape.ngc")],
      ["stat", () => simulator.fs.opfs.stat("../escape.ngc")],
      ["moveFile", () => simulator.fs.opfs.moveFile("../escape.ngc", "programs/escape.ngc")],
      ["moveFileTarget", () => simulator.fs.opfs.moveFile("healthcheck.ngc", "../escape.ngc")],
      ["removeFile", () => simulator.fs.opfs.removeFile("../escape.ngc")],
      ["removeDirectory", () => simulator.fs.opfs.removeDirectory("../escape")],
      ["parseFile", () => simulator.parseFile("../escape.ngc", "linuxcnc", { backend: "linuxcnc-rs274" })],
      [
        "parseWithParameterFile",
        () =>
          simulator.parseWithParameterFile("G21 G90\nM30\n", "../escape.var", "linuxcnc", {
            backend: "linuxcnc-rs274",
          }),
      ],
      [
        "parseFileWithParameterFileProgram",
        () =>
          simulator.parseFileWithParameterFile("../escape.ngc", "parameters/escape.var", "linuxcnc", {
            backend: "linuxcnc-rs274",
          }),
      ],
      [
        "parseFileWithParameterFileParameter",
        () =>
          simulator.parseFileWithParameterFile("programs/browser-smoke.ngc", "../escape.var", "linuxcnc", {
            backend: "linuxcnc-rs274",
          }),
      ],
    ]) {
      await expectErrorContaining(
        action,
        "inside the CNC workspace",
        `OPFS ${operation} accepted an unsafe path`,
      );
    }
  });

  await runSection("opfs program parse and restore", async () => {
    const opfsProgramEvents = await simulator.parseFile("programs/browser-smoke.ngc", "linuxcnc", {
      backend: "linuxcnc-rs274",
    });
    expectEvent(opfsProgramEvents, (event) => event.type === "rapid" && near(event.end.x, 1),
      "OPFS program file was not parsed through LinuxCNC WASM");
    for (const parameterPath of ["rs274ngc.var", "rs274ngc.var.new", "rs274ngc.var.bak"]) {
      expectMissingWasmPath(
        () => simulator.fs.module.FS.stat(parameterPath),
        `browser parseFile left LinuxCNC parameter state outside OPFS: ${parameterPath}`,
      );
    }
    await withSmokeSimulator(async (restoredProgramSimulator) => {
      // LinuxCNC source basis: rs274ngc_pre.cc read_text() reads
      // blocks from the program stream after the OPFS mirror is loaded.
      const restoredProgramEvents = await restoredProgramSimulator.parseFile(
        "programs/browser-smoke.ngc",
        "linuxcnc",
        { backend: "linuxcnc-rs274" },
      );
      expectEvent(restoredProgramEvents, (event) => event.type === "rapid" && near(event.end.x, 1),
        "LinuxCNC OPFS program file was not restored across WASM simulator instances");
    });
  });
}