export async function runBrowserAppOpfsSections(context) {
  const {
    browserHasOpfs,
    createHiddenAppFrame,
    disposeAppFrame,
    expectIncludes,
    expectText,
    getAppFrameSimulator,
    parseAppFrameProgram,
    runSection,
    waitFor,
    waitForAppAlarm,
    waitForAppControls,
  } = context;
  if (!browserHasOpfs()) {
    return;
  }
  await runSection("browser app opfs save", async () => {
    const appFrame = await createHiddenAppFrame();
    try {
      await waitForAppControls(appFrame, "app frame did not load CNC controls");
      parseAppFrameProgram(appFrame, "G21 G90\nG0 X1\nG28.1\nM30\n");
      await waitForAppAlarm(appFrame, "OK ", "app frame did not parse program");
      const appSimulator = await getAppFrameSimulator(appFrame, "app frame did not create OPFS simulator workspace");
      const savedProgram = new TextDecoder().decode(await appSimulator.fs.opfs.readFile("programs/current.ngc"));
      expectText(savedProgram, "G21 G90\nG0 X1\nG28.1\nM30\n",
        "app frame did not persist current program into OPFS");
      const savedParameterFile = new TextDecoder().decode(await appSimulator.fs.opfs.readFile("parameters/rs274ngc.var"));
      expectIncludes(savedParameterFile, "5161\t1.000000",
        "app frame did not persist LinuxCNC parameter state into OPFS");
      await appSimulator.fs.opfs.removeFile("parameters/rs274ngc.var.bak");
      parseAppFrameProgram(appFrame, "G21 G90\nG0 X2\nG28.1\nM30\n");
      await waitFor(
        () => appFrame.contentDocument?.querySelector("#axisX")?.value === "2.000",
        "app frame did not parse second program for parameter backup coverage",
      );
      // LinuxCNC source basis: rs274ngc_pre.cc save_parameters()
      // preserves the previous parameter file as filename + ".bak".
      const updatedParameterFile = new TextDecoder().decode(await appSimulator.fs.opfs.readFile("parameters/rs274ngc.var"));
      expectIncludes(updatedParameterFile, "5161\t2.000000",
        "app frame did not replace LinuxCNC parameter state after second parse");
      const savedParameterBackup = new TextDecoder().decode(await appSimulator.fs.opfs.readFile("parameters/rs274ngc.var.bak"));
      expectIncludes(savedParameterBackup, "5161\t1.000000",
        "app frame did not persist LinuxCNC parameter backup into OPFS");
      await appSimulator.fs.opfs.removeFile("parameters/rs274ngc.var.bak");
      const backupDirectory = appSimulator.fs.opfs.resolvePath("parameters/rs274ngc.var.bak");
      appSimulator.fs.module.FS.mkdir(backupDirectory);
      await appSimulator.fs.opfs.persistDirectory("parameters/rs274ngc.var.bak");
      parseAppFrameProgram(appFrame, "G21 G90\nG0 X3\nG28.1\nM30\n");
      await waitFor(
        () => appFrame.contentDocument?.querySelector("#axisX")?.value === "3.000",
        "app frame did not parse third program for backup-directory coverage",
      );
      const directoryBackupParameterFile = new TextDecoder().decode(await appSimulator.fs.opfs.readFile("parameters/rs274ngc.var"));
      expectIncludes(directoryBackupParameterFile, "5161\t3.000000",
        "app frame did not save LinuxCNC parameter state when backup link failed");
      await context.expectOpfsDirectoryStat(
        appSimulator,
        "parameters/rs274ngc.var.bak",
        "app frame removed an existing OPFS backup directory after LinuxCNC non-fatal backup failure",
      );
      // LinuxCNC source basis: rs274ngc_pre.cc save_parameters()
      // renames filename + ".new" over filename after a successful save.
      await context.expectOpfsMissing(
        appSimulator,
        "parameters/rs274ngc.var.new",
        "app frame did not clean up LinuxCNC temporary parameter file in OPFS",
      );
    } finally {
      await disposeAppFrame(appFrame);
    }
  });
  await runSection("browser app opfs restore", async () => {
    const restoredAppFrame = await createHiddenAppFrame();
    try {
      await waitForAppControls(restoredAppFrame, "restored app frame did not load CNC controls");
      await waitFor(() => {
        const restoredInput = restoredAppFrame.contentDocument?.querySelector("#programInput");
        return restoredInput?.value === "G21 G90\nG0 X3\nG28.1\nM30\n";
      }, "app frame did not restore current program from OPFS after reload");
      await waitForAppAlarm(
        restoredAppFrame,
        "OPFS PROGRAM RESTORED",
        "app frame did not report OPFS program restore after reload",
      );
      await getAppFrameSimulator(restoredAppFrame, "restored app frame did not create OPFS simulator workspace");
      parseAppFrameProgram(
        restoredAppFrame,
        "G21 G90\nF100\nO10 if [#5161 EQ 3]\nG1 X13\nO10 endif\nM30\n",
      );
      await waitForAppAlarm(
        restoredAppFrame,
        "OK ",
        "restored app frame did not parse program with reloaded parameter state",
      );
      await waitFor(
        () => restoredAppFrame.contentDocument?.querySelector("#axisX")?.value === "13.000",
        "app frame did not reload LinuxCNC parameter state from OPFS after reload",
      );
    } finally {
      await disposeAppFrame(restoredAppFrame);
    }
  });
}