'use strict';

const test = require('node:test');
const assert = require('node:assert/strict');
const {
  buildDeviceTree,
  flattenVisibleRows,
  createSearchRunner,
  calculateVirtualWindow,
} = require('../device-tree');

function baseFixture() {
  return {
    sites: [
      { id: 's2', name: 'Zulu' },
      { id: 's1', name: 'Alpha', pendingDeletionStart: '2026-08-19T12:00:00Z' },
    ],
    groups: [
      { id: 'g2', name: 'Doors', parentId: 's2' },
      { id: 'g1', name: 'Lobby', parentId: 's1', pendingDeletionStart: '2026-08-19T12:00:00Z' },
    ],
    devices: [
      { id: 'c4', name: 'No Group', siteId: 's1', type: 'camera' },
      { id: 'c2', name: 'Inferred', deviceGroupId: 'g2', model: 'H5A' },
      { id: 'c1', name: 'Front', siteId: 's1', deviceGroupId: 'g1', address: '10.0.0.1' },
      { id: 'c3', name: 'Conflict', siteId: 's1', deviceGroupId: 'g2' },
      { id: 'c5', name: 'Unknown Group', siteId: 's1', deviceGroupId: 'missing-g' },
      { id: 'c6', name: 'Unknown Site', siteId: 'missing-s' },
      { id: 'c7', name: 'Orphan' },
    ],
  };
}

test('builds deterministic hierarchy with explicit exceptional buckets and diagnostics', () => {
  const model = buildDeviceTree(baseFixture());
  assert.deepEqual(model.sites.map((site) => site.name), ['Alpha', 'Orphaned cameras', 'Unknown site: missing-s', 'Zulu']);
  assert.equal(model.sites[0].pendingDeletion, true);
  assert.deepEqual(model.sites[0].groups.map((group) => group.name), ['Doors', 'Lobby', 'Ungrouped', 'Unknown group: missing-g']);
  assert.equal(model.sites[0].groups.find((group) => group.id === 'g1').pendingDeletion, true);
  assert.deepEqual(model.sites[3].groups[0].cameras.map((camera) => camera.name), ['Inferred']);

  const conflict = model.cameraByKey.get('camera:c3');
  assert.equal(conflict.site.id, 's1');
  assert.equal(conflict.group.name, 'Doors');
  assert.equal(conflict.hierarchyStatus, 'conflict');
  assert.equal(model.cameraByKey.get('camera:c2').hierarchyStatus, 'inferred-site');
  assert.ok(model.diagnostics.some((entry) => entry.code === 'site-group-conflict' && entry.key === 'camera:c3'));
});

test('duplicate and malformed IDs get stable unique keys and diagnostics', () => {
  const fixture = {
    sites: [{ id: 's', name: 'A' }, { id: 's', name: 'B' }, { name: 'Bad' }],
    groups: [{ id: 'g', name: 'G', parentId: 's' }, { id: 'g', name: 'G2', parentId: 's' }],
    devices: [
      { id: 'c', name: 'Same', siteId: 's', deviceGroupId: 'g' },
      { id: 'c', name: 'Same', siteId: 's', deviceGroupId: 'g' },
      { name: 'Missing', siteId: 's' },
    ],
  };
  const first = buildDeviceTree(fixture);
  const second = buildDeviceTree(fixture);
  assert.deepEqual([...first.rowByKey.keys()], [...second.rowByKey.keys()]);
  assert.equal(new Set(first.rowByKey.keys()).size, first.rowByKey.size);
  assert.ok(first.diagnostics.filter((entry) => entry.code === 'duplicate-id').length >= 3);
  assert.ok(first.diagnostics.filter((entry) => entry.code === 'malformed-id').length >= 2);
});

test('sites start collapsed; expansion produces levels and complete ARIA metadata', () => {
  const model = buildDeviceTree(baseFixture());
  let rows = flattenVisibleRows(model, { expandedKeys: new Set(), selectedKey: 'camera:c1' });
  assert.equal(rows.length, 4);
  assert.ok(rows.every((row) => row.kind === 'site' && row.aria.level === 1 && row.aria.expanded === false));
  assert.ok(rows.every((row) => row.aria.setsize === 4));
  assert.equal(rows.hiddenSelected, true);

  rows = flattenVisibleRows(model, { expandedKeys: new Set(['site:s1']) });
  assert.deepEqual(rows.slice(0, 5).map((row) => row.kind), ['site', 'group', 'group', 'group', 'group']);
  assert.ok(rows.slice(1, 5).every((row) => row.aria.level === 2 && row.aria.expanded === false));

  rows = flattenVisibleRows(model, {
    expandedKeys: new Set(['site:s1', 'group:s1:g1']),
    selectedKey: 'camera:c1',
  });
  const camera = rows.find((row) => row.key === 'camera:c1');
  assert.equal(camera.parentKey, 'group:s1:g1');
  assert.deepEqual(camera.aria, { level: 3, expanded: undefined, selected: true, posinset: 1, setsize: 1 });
  assert.equal(rows.hiddenSelected, false);
});

test('search covers camera fields and ancestors without mutating saved expansion', async () => {
  const model = buildDeviceTree(baseFixture());
  const scheduled = [];
  const runner = createSearchRunner({ scheduler: (work) => scheduled.push(work), chunkSize: 2 });
  const saved = new Set(['site:s2']);
  const promise = runner.search(model, 'alpha lobby 10.0.0.1', { expandedKeys: saved });
  while (scheduled.length) scheduled.shift()();
  const result = await promise;
  assert.equal(result.count, 1);
  assert.deepEqual([...result.cameraKeys], ['camera:c1']);
  assert.ok(result.expandedKeys.has('site:s1'));
  assert.ok(result.expandedKeys.has('group:s1:g1'));
  assert.deepEqual([...saved], ['site:s2']);

  const ancestorPromise = runner.search(model, 'zulu', { expandedKeys: new Set() });
  while (scheduled.length) scheduled.shift()();
  const ancestor = await ancestorPromise;
  assert.deepEqual([...ancestor.cameraKeys], ['camera:c2']);
});

test('new search cancels stale chunked generation', async () => {
  const model = buildDeviceTree({
    sites: [{ id: 's', name: 'Site' }],
    groups: [],
    devices: Array.from({ length: 700 }, (_, i) => ({ id: `c${i}`, name: `Camera ${i}`, siteId: 's' })),
  });
  const scheduled = [];
  const runner = createSearchRunner({ scheduler: (work) => scheduled.push(work), chunkSize: 250 });
  const stale = runner.search(model, 'camera', {});
  scheduled.shift()();
  const current = runner.search(model, 'camera 699', {});
  while (scheduled.length) scheduled.shift()();
  const [staleResult, currentResult] = await Promise.all([stale, current]);
  assert.equal(staleResult.cancelled, true);
  assert.equal(currentResult.cancelled, false);
  assert.equal(currentResult.count, 1);
});

test('virtual window remains structurally bounded for 5,000 expanded shuffled cameras', () => {
  const devices = Array.from({ length: 5000 }, (_, i) => ({ id: `id-${i}`, name: `Camera ${String(i).padStart(4, '0')}`, siteId: 's' }));
  for (let i = devices.length - 1; i > 0; i -= 1) {
    const j = (i * 48271) % (i + 1);
    [devices[i], devices[j]] = [devices[j], devices[i]];
  }
  const model = buildDeviceTree({ sites: [{ id: 's', name: 'Large' }], groups: [], devices });
  const rows = flattenVisibleRows(model, { expandedKeys: new Set(['site:s', 'group:s:__ungrouped__']) });
  const window = calculateVirtualWindow(rows, { scrollTop: 50000, viewportHeight: 320, rowHeight: 28 });
  assert.ok(window.rows.length >= 40 && window.rows.length <= 50, `mounted ${window.rows.length}`);
  assert.equal(window.totalHeight, rows.length * 28);
  assert.equal(window.offsetTop, window.startIndex * 28);
});

test('1,500-site/group fixture has deterministic stable ordering', () => {
  const sites = Array.from({ length: 1500 }, (_, i) => ({ id: `s-${i}`, name: `Site ${i % 17}` }));
  const groups = sites.map((site, i) => ({ id: `g-${i}`, name: `Group ${i % 11}`, parentId: site.id }));
  const model = buildDeviceTree({ sites: sites.reverse(), groups: groups.reverse(), devices: [] });
  const namesAndIds = model.sites.map((site) => `${site.normalizedName}|${site.id}`);
  assert.deepEqual(namesAndIds, [...namesAndIds].sort((a, b) => a.localeCompare(b)));
});