'use strict';

const test = require('node:test');
const assert = require('node:assert/strict');
const { buildDeviceTree, flattenVisibleRows } = require('../device-tree');
const { createInitialState, reduceSidebar, createSidebarController } = require('../sidebar-controller');

function fixture() {
  const model = buildDeviceTree({
    sites: [{ id: 's', name: 'Site' }],
    groups: [{ id: 'g', name: 'Group', parentId: 's' }],
    devices: [
      { id: 'a', name: 'Alpha', siteId: 's', deviceGroupId: 'g' },
      { id: 'b', name: 'Beta', siteId: 's', deviceGroupId: 'g' },
    ],
  });
  return model;
}

function visible(model, state) {
  return flattenVisibleRows(model, state);
}

test('reducer expands, navigates, selects, collapses, and preserves hidden selection', () => {
  const model = fixture();
  let state = createInitialState();
  let rows = visible(model, state);
  state = reduceSidebar(state, { type: 'KEY', key: 'Home' }, rows);
  assert.equal(state.activeKey, 'site:s');
  state = reduceSidebar(state, { type: 'KEY', key: 'ArrowRight' }, rows);
  assert.ok(state.expandedKeys.has('site:s'));

  rows = visible(model, state);
  state = reduceSidebar(state, { type: 'KEY', key: 'ArrowDown' }, rows);
  assert.equal(state.activeKey, 'group:s:g');
  state = reduceSidebar(state, { type: 'KEY', key: 'ArrowRight' }, rows);
  rows = visible(model, state);
  state = reduceSidebar(state, { type: 'KEY', key: 'ArrowDown' }, rows);
  state = reduceSidebar(state, { type: 'KEY', key: 'Enter' }, rows);
  assert.equal(state.selectedKey, 'camera:a');

  state = reduceSidebar(state, { type: 'ACTIVATE', rowKey: 'site:s' }, rows);
  assert.equal(state.selectedKey, 'camera:a');
  assert.equal(visible(model, state).hiddenSelected, true);
});

test('keyboard Left/Right parent behavior, bounds, Space and Escape', () => {
  const model = fixture();
  let state = createInitialState({
    expandedKeys: new Set(['site:s', 'group:s:g']),
    activeKey: 'camera:a',
    searchQuery: 'alpha',
  });
  let rows = visible(model, state);
  state = reduceSidebar(state, { type: 'KEY', key: 'ArrowLeft' }, rows);
  assert.equal(state.activeKey, 'group:s:g');
  state = reduceSidebar(state, { type: 'KEY', key: 'ArrowLeft' }, rows);
  assert.equal(state.expandedKeys.has('group:s:g'), false);
  state = reduceSidebar(state, { type: 'KEY', key: 'End' }, visible(model, state));
  assert.equal(state.activeKey, 'group:s:g');
  state = reduceSidebar(state, { type: 'KEY', key: ' ' }, visible(model, state));
  assert.equal(state.expandedKeys.has('group:s:g'), true);
  state = reduceSidebar(state, { type: 'KEY', key: 'Escape' }, visible(model, state));
  assert.equal(state.searchQuery, '');
});

test('malformed and unknown delegated row keys are no-ops', () => {
  const state = createInitialState({ activeKey: 'site:s' });
  const rows = visible(fixture(), state);
  assert.equal(reduceSidebar(state, { type: 'ACTIVATE', rowKey: '__proto__' }, rows), state);
  assert.equal(reduceSidebar(state, { type: 'CLICK', rowKey: 'camera:not-there' }, rows), state);
});

test('controller commits exactly once per dispatch through view adapter', () => {
  const model = fixture();
  const commits = [];
  const view = { commit: (snapshot) => commits.push(snapshot) };
  const controller = createSidebarController({ model, view, rowHeight: 28, overscan: 3 });
  assert.equal(commits.length, 1);
  controller.dispatch({ type: 'ACTIVATE', rowKey: 'site:s' });
  assert.equal(commits.length, 2);
  assert.equal(commits[1].state.expandedKeys.has('site:s'), true);
  assert.ok(Array.isArray(commits[1].window.rows));
  const modelReference = controller.getSnapshot().rows;
  controller.refresh();
  assert.equal(commits.length, 3);
  assert.notEqual(controller.getSnapshot().rows, modelReference);
  assert.equal(controller.getSnapshot().rows.length, modelReference.length);
});

test('active and selected state survive virtualization and selection is indicated when hidden', () => {
  const model = fixture();
  const commits = [];
  const controller = createSidebarController({ model, view: { commit: (value) => commits.push(value) } });
  controller.dispatch({ type: 'SET_SELECTION', rowKey: 'camera:b' });
  controller.dispatch({ type: 'SET_VIEWPORT', scrollTop: 9999, viewportHeight: 20 });
  const snapshot = commits.at(-1);
  assert.equal(snapshot.state.selectedKey, 'camera:b');
  assert.equal(snapshot.rows.hiddenSelected, true);
});

test('controller search temporarily expands matches with one completion commit', async () => {
  const model = fixture();
  const commits = [];
  const scheduled = [];
  const controller = createSidebarController({
    model,
    view: { commit: (value) => commits.push(value) },
    scheduler: (work) => scheduled.push(work),
    chunkSize: 1,
  });
  const pending = controller.search('beta group');
  while (scheduled.length) scheduled.shift()();
  const result = await pending;
  assert.equal(result.count, 1);
  assert.equal(commits.length, 2);
  assert.deepEqual(commits.at(-1).rows.map((row) => row.key), ['site:s', 'group:s:g', 'camera:b']);
  assert.equal(controller.getState().expandedKeys.size, 0);
});