import assert from "node:assert/strict";

import {
  getOpfsRoot,
  loadTextFile,
  saveTextFile,
} from "../../../runtime/opfs/file-service.js";
import {
  defaultMachinePaths,
  gcodeProgramPath,
  machineIniPath,
  normalizeOpfsPath,
  parameterFilePath,
  previewCachePath,
  sessionSnapshotPath,
  toolTablePath,
} from "../../../runtime/opfs/path-model.js";
import {
  createSessionSnapshot,
  loadSessionSnapshot,
  saveSessionSnapshot,
  validateSessionSnapshot,
} from "../../../runtime/opfs/snapshot-store.js";

class MockFileHandle {
  constructor(name) {
    this.name = name;
    this.textValue = "";
  }

  async createWritable() {
    return {
      write: async (text) => {
        this.textValue = String(text);
      },
      close: async () => {},
    };
  }

  async getFile() {
    return {
      text: async () => this.textValue,
    };
  }
}

class MockDirectoryHandle {
  constructor(name = "") {
    this.name = name;
    this.dirs = new Map();
    this.files = new Map();
  }

  async getDirectoryHandle(name, options = {}) {
    if (!this.dirs.has(name)) {
      if (!options.create) {
        throw new Error(`missing directory: ${name}`);
      }
      this.dirs.set(name, new MockDirectoryHandle(name));
    }
    return this.dirs.get(name);
  }

  async getFileHandle(name, options = {}) {
    if (!this.files.has(name)) {
      if (!options.create) {
        throw new Error(`missing file: ${name}`);
      }
      this.files.set(name, new MockFileHandle(name));
    }
    return this.files.get(name);
  }
}

const root = new MockDirectoryHandle();
const storage = {
  getDirectory: async () => root,
};

assert.equal(await getOpfsRoot(storage), root);

assert.equal(normalizeOpfsPath("linuxcnc/machines/xyzab.ini"), "linuxcnc/machines/xyzab.ini");
assert.equal(machineIniPath("xyzab-tdr"), "linuxcnc/machines/xyzab-tdr/machine.ini");
assert.equal(toolTablePath("xyzab-tdr"), "linuxcnc/machines/xyzab-tdr/tool.tbl");
assert.equal(parameterFilePath("xyzab-tdr"), "linuxcnc/machines/xyzab-tdr/linuxcnc.var");
assert.equal(gcodeProgramPath("fixture.ngc"), "linuxcnc/gcode/fixture.ngc");
assert.equal(previewCachePath("fixture"), "linuxcnc/preview-cache/fixture/preview.json");
assert.equal(sessionSnapshotPath("session-1"), "linuxcnc/sessions/session-1/snapshot.json");
assert.deepEqual(defaultMachinePaths("xyzab-tdr"), {
  ini: "linuxcnc/machines/xyzab-tdr/machine.ini",
  toolTable: "linuxcnc/machines/xyzab-tdr/tool.tbl",
  parameters: "linuxcnc/machines/xyzab-tdr/linuxcnc.var",
});

const snapshotPayload = {
  files: {
    ini: machineIniPath("xyzab-tdr"),
    toolTable: toolTablePath("xyzab-tdr"),
  },
};
const snapshot = createSessionSnapshot("session-1", snapshotPayload, {
  createdAt: "2026-06-08T00:00:00.000Z",
  metadata: { source: "node-smoke" },
});
assert.deepEqual(snapshot, {
  format: "linuxcnc-wasm-session-snapshot",
  version: 1,
  sessionId: "session-1",
  createdAt: "2026-06-08T00:00:00.000Z",
  metadata: { source: "node-smoke" },
  payload: snapshotPayload,
});
assert.equal(validateSessionSnapshot(snapshot, "session-1"), snapshot);

await saveTextFile(
  "linuxcnc/machines/xyzab.ini",
  "[EMC]\nMACHINE = opfs-smoke\n",
  storage,
);
assert.equal(
  await loadTextFile("linuxcnc/machines/xyzab.ini", storage),
  "[EMC]\nMACHINE = opfs-smoke\n",
);

await saveSessionSnapshot("session-1", snapshotPayload, {
  storage,
  createdAt: "2026-06-08T00:00:00.000Z",
  metadata: { source: "node-smoke" },
});
assert.deepEqual(await loadSessionSnapshot("session-1", { storage }), snapshot);

await assert.rejects(
  () => loadTextFile("linuxcnc/machines/missing.ini", storage),
  /missing file/,
);
await assert.rejects(
  () => saveTextFile("../escape.ini", "", storage),
  /Invalid OPFS path/,
);
assert.throws(
  () => machineIniPath("../escape"),
  /Invalid machine id/,
);
await saveTextFile(sessionSnapshotPath("bad-json"), "{", storage);
await assert.rejects(
  () => loadSessionSnapshot("bad-json", { storage }),
  /Invalid session snapshot JSON/,
);
await assert.rejects(
  () => loadSessionSnapshot("missing-session", { storage }),
  /missing directory|missing file/,
);
await assert.rejects(
  () => getOpfsRoot({}),
  /OPFS is not available/,
);

console.log("opfs_file_service_node_smoke=ok");