import assert from 'node:assert/strict';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import test from 'node:test';
import { parseNeighborSnapshot, readNeighborSnapshot } from '../../src/server/adapters/neighbors.js';
import {
  createDeviceInventoryService,
  createVendorLookup,
} from '../../src/server/services/deviceInventoryService.js';
import { createJsonStore } from '../../src/server/services/stateStore.js';

test('device inventory discovers, merges, persists metadata and expires anonymous devices', async (t) => {
  const directory = fs.mkdtempSync(path.join(os.tmpdir(), 'harbor-devices-'));
  t.after(() => fs.rmSync(directory, { recursive: true, force: true }));
  const store = createJsonStore({ filePath: path.join(directory, 'devices.json'), defaultValue: {} });
  const ouiPath = path.join(directory, 'oui.txt');
  fs.writeFileSync(ouiPath, '00-11-22   (hex)\t\tExample Devices\n');
  const vendor = createVendorLookup(ouiPath);
  assert.equal(vendor('00:11:22:33:44:55'), 'Example Devices');
  assert.equal(vendor('02:11:22:33:44:55'), null);

  let current = new Date('2026-07-01T10:00:00.000Z');
  let observation = {
    observedAt: current.toISOString(),
    observations: parseNeighborSnapshot([
      { dst: '192.168.50.10', dev: 'br0', lladdr: '00:11:22:33:44:55', state: ['REACHABLE'] },
      { dst: '192.168.50.10', dev: 'br0', lladdr: '00:11:22:33:44:55', state: ['STALE'] },
      { dst: '192.168.50.11', dev: 'br0', state: ['INCOMPLETE'] },
    ], current.toISOString()),
    error: null,
  };
  let observeCalls = 0;
  const service = createDeviceInventoryService({
    store,
    observe: async () => {
      observeCalls += 1;
      return observation;
    },
    vendor,
    now: () => current,
  });

  const [firstRefresh, sharedRefresh] = await Promise.all([service.refresh(), service.refresh()]);
  let snapshot = firstRefresh;
  assert.strictEqual(sharedRefresh, firstRefresh);
  assert.equal(observeCalls, 1);
  assert.equal(snapshot.devices.length, 1);
  assert.equal(snapshot.devices[0].manufacturer, 'Example Devices');
  assert.equal(snapshot.devices[0].status, 'online');
  assert.equal(snapshot.devices[0].confidence, 'high');

  current = new Date('2026-07-01T10:05:00.000Z');
  observation = {
    observedAt: current.toISOString(),
    observations: parseNeighborSnapshot([
      { dst: '192.168.50.10', dev: 'br0', lladdr: '00:11:22:33:44:55', state: ['STALE'] },
    ], current.toISOString()),
    error: null,
  };
  const firstSeen = snapshot.devices[0].lastSeenAt;
  snapshot = await service.refresh();
  assert.equal(snapshot.devices[0].lastSeenAt, firstSeen);
  assert.equal(snapshot.devices[0].status, 'recent');

  snapshot = service.update(snapshot.devices[0].id, { alias: 'Телевизор', pinned: true }, snapshot.revision);
  const restarted = createDeviceInventoryService({ store, observe: async () => observation, vendor, now: () => current });
  assert.deepEqual(restarted.snapshot().devices[0], snapshot.devices[0]);
  assert.throws(
    () => restarted.update(snapshot.devices[0].id, { pinned: false }, snapshot.revision - 1),
    (error) => error.code === 'STATE_CONFLICT',
  );

  observation = { observedAt: current.toISOString(), observations: [], error: 'source unavailable' };
  snapshot = await restarted.refresh();
  assert.equal(snapshot.devices.length, 1);
  assert.equal(snapshot.source.error, 'source unavailable');

  snapshot = restarted.update(snapshot.devices[0].id, { alias: '', pinned: false }, snapshot.revision);
  current = new Date('2026-08-02T10:00:00.000Z');
  observation = { observedAt: current.toISOString(), observations: [], error: null };
  snapshot = await restarted.refresh();
  assert.equal(snapshot.devices.length, 0);

  const failed = readNeighborSnapshot(() => ({ status: 1, stderr: 'not available' }), () => current);
  assert.deepEqual(failed.observations, []);
  assert.match(failed.error, /not available/);
});