'use strict';

const test = require('node:test');
const assert = require('node:assert/strict');
const {
  MAX_PROJECTED_PAYLOAD_BYTES,
  projectDeviceHierarchy,
} = require('../src/device-projection');
const { buildDeviceTree } = require('../device-tree');

function uuid(index) {
  return `00000000-0000-4000-8000-${index.toString(16).padStart(12, '0')}`;
}

function rawDevice(index, overrides = {}) {
  return {
    guid: uuid(index),
    name: `Camera ${index}`,
    type: 'camera',
    model: 'Synthetic',
    address: `10.0.${Math.floor(index / 255)}.${index % 255}`,
    server_group_id: 'server-group-1',
    device_group_id: 'group-1',
    capabilities: { localStorage: index % 2 === 0, secretCapability: 'drop-me' },
    live: { display_status: 'online', private: 'drop-me' },
    cookie: 'must-not-cross-ipc',
    ...overrides,
  };
}

test('projects only allowlisted fields and honestly diagnoses ineligible devices', () => {
  const payload = projectDeviceHierarchy({
    devices: [
      rawDevice(1),
      rawDevice(2, { guid: 'not-a-uuid' }),
      rawDevice(4),
    ],
    sites: [{ id: 'site-1', name: 'HQ', pending_deletion_start: null, secret: 'drop-me' }],
    groups: [{ id: 'group-1', name: 'Lobby', parent_id: null, pending_deletion_start: null, secret: 'drop-me' }],
  });

  assert.deepEqual(payload.devices, [{
    id: uuid(1), name: 'Camera 1', type: 'camera', model: 'Synthetic', address: '10.0.0.1',
    siteId: null, deviceGroupId: 'group-1', displayStatus: 'online', localStorage: false,
  }]);
  assert.deepEqual(payload.sites, [{ id: 'site-1', name: 'HQ', pendingDeletionStart: null }]);
  assert.deepEqual(payload.groups, [{ id: 'group-1', name: 'Lobby', parentId: null, pendingDeletionStart: null }]);
  assert.deepEqual(payload.diagnostics.devices, {
    received: 3, eligible: 1, invalid: 1, cloudNativeExcluded: 1,
  });
  assert.doesNotMatch(JSON.stringify(payload), /drop-me|cookie|secretCapability|private/);
});

test('infers camera sites from device-group parents instead of server groups', () => {
  const payload = projectDeviceHierarchy({
    devices: [rawDevice(3, {
      name: 'Front Door',
      server_group_id: 'cloud-connector-server-group',
      device_group_id: 'entrances',
    })],
    sites: [{ id: 'test-site', name: 'Test Site' }],
    groups: [{ id: 'entrances', name: 'Entrances', parent_id: 'test-site' }],
  });
  const model = buildDeviceTree(payload);
  const camera = [...model.cameraByKey.values()][0];

  assert.equal(payload.devices[0].siteId, null);
  assert.equal(camera.site.canonicalId, 'test-site');
  assert.equal(camera.group.canonicalId, 'entrances');
  assert.equal(camera.hierarchyStatus, 'inferred-site');
  assert.deepEqual(model.diagnostics, []);
});

test('excludes cloud-native cameras while retaining Cloud Connector and unknown-storage devices', () => {
  const payload = projectDeviceHierarchy({
    devices: [
      rawDevice(10, { name: 'Cloud Native', capabilities: { localStorage: true } }),
      rawDevice(11, { name: 'Cloud Connector', capabilities: { localStorage: false } }),
      rawDevice(12, { name: 'Unknown Storage', capabilities: {} }),
    ],
  });

  assert.deepEqual(payload.devices.map((device) => device.name), ['Cloud Connector', 'Unknown Storage']);
  assert.deepEqual(payload.diagnostics.devices, {
    received: 3, eligible: 2, invalid: 0, cloudNativeExcluded: 1,
  });
});

test('projects synthetic 1,500 and 10,000 camera deployments below the 8 MiB IPC cap', () => {
  for (const count of [1_500, 10_000]) {
    const payload = projectDeviceHierarchy({
      devices: Array.from({ length: count }, (_, index) => rawDevice(index, {
        capabilities: { localStorage: false },
      })),
      sites: [],
      groups: [],
    });
    assert.equal(payload.devices.length, count);
    assert.equal(payload.diagnostics.devices.received, count);
    assert.ok(Buffer.byteLength(JSON.stringify(payload)) <= MAX_PROJECTED_PAYLOAD_BYTES);
  }
});

test('malformed hierarchy metadata does not hide valid cameras', () => {
  const payload = projectDeviceHierarchy({
    devices: [rawDevice(7)],
    sites: [null, { id: {}, name: 'bad' }],
    groups: ['bad'],
    metadataErrors: { sites: 'Unavailable', groups: 'Unavailable' },
  });
  assert.equal(payload.devices.length, 1);
  assert.deepEqual(payload.sites, []);
  assert.deepEqual(payload.groups, []);
  assert.equal(payload.diagnostics.sites.invalid, 2);
  assert.equal(payload.diagnostics.groups.invalid, 1);
  assert.equal(payload.diagnostics.sites.error, 'Unavailable');
});

test('repairs lone UTF-16 surrogates without changing valid Unicode or hiding cameras', () => {
  const payload = projectDeviceHierarchy({
    devices: [rawDevice(8, {
      name: 'Front \ud800 camera',
      model: 'Model \udc00',
      address: 'Hall \ud800\udc00 / \udc00',
      server_group_id: 'site-\ud800',
      device_group_id: 'group-\udc00',
      capabilities: { localStorage: false },
    })],
    sites: [{ id: 'site-\ud800', name: 'Valid \ud83d\udcf7 \udc00', pending_deletion_start: '\ud800' }],
    groups: [{ id: 'group-\udc00', name: 'Group \ud83d\udcf7 \ud800', parent_id: 'site-\ud800' }],
    metadataErrors: { sites: 'warning \ud800', groups: 'warning \udc00' },
  });

  assert.equal(payload.devices.length, 1);
  assert.equal(payload.devices[0].name, 'Front \ufffd camera');
  assert.equal(payload.devices[0].model, 'Model \ufffd');
  assert.equal(payload.devices[0].address, 'Hall \ud800\udc00 / \ufffd');
  assert.equal(payload.devices[0].siteId, null);
  assert.equal(payload.devices[0].deviceGroupId, 'group-\ufffd');
  assert.deepEqual(payload.sites, [{ id: 'site-\ufffd', name: 'Valid \ud83d\udcf7 \ufffd', pendingDeletionStart: '\ufffd' }]);
  assert.deepEqual(payload.groups, [{ id: 'group-\ufffd', name: 'Group \ud83d\udcf7 \ufffd', parentId: 'site-\ufffd', pendingDeletionStart: null }]);
  assert.equal(payload.diagnostics.sites.error, 'warning \ufffd');
  assert.doesNotMatch(JSON.stringify(payload), /[\ud800-\udfff]/u);
});

test('rejects a projected hierarchy payload above 8 MiB', () => {
  const devices = Array.from({ length: 10_000 }, (_, index) => rawDevice(index, {
    name: `Camera ${index} ${'x'.repeat(900)}`,
    capabilities: { localStorage: false },
  }));
  assert.throws(
    () => projectDeviceHierarchy({ devices, sites: [], groups: [] }),
    { code: 'PROJECTED_PAYLOAD_TOO_LARGE' },
  );
});