import test from 'node:test';
import assert from 'node:assert/strict';
import { LatestLane, AutomaticIndexGate, emptySearchState, semanticAvailable, SEMANTIC_SETTLE_MS, hasSearchInput, scopedFilters } from '../src/search-state.ts';
const settle = () => new Promise(resolve => setImmediate(resolve));

test('coalesces queued keystrokes and discards stale responses', async () => {
  let revision = 1; let release; const executed = []; const accepted = [];
  const lane = new LatestLane(async value => {
    executed.push(value);
    if (value === 1) await new Promise(resolve => { release = resolve; });
    if (value === revision) accepted.push(value);
  }, value => value === revision, () => assert.fail('Unexpected failure'));
  lane.submit(1); revision = 2; lane.submit(2); revision = 3; lane.submit(3);
  release(); await settle();
  assert.deepEqual(executed, [1, 3]); assert.deepEqual(accepted, [3]);
});

test('Escape invalidates both active and queued work', async () => {
  let revision = 1; let release; const accepted = [];
  const lane = new LatestLane(async value => {
    await new Promise(resolve => { release = resolve; });
    if (value === revision) accepted.push(value);
  }, value => value === revision, () => assert.fail('Unexpected failure'));
  lane.submit(1); lane.submit(1); revision++; lane.clear(); release(); await settle();
  assert.deepEqual(accepted, []);
});

test('busy retries are bounded and stop when superseded', async () => {
  let attempts = 0; let errors = 0;
  const lane = new LatestLane(async () => { attempts++; throw new Error('worker busy'); }, () => true, () => errors++, async () => {});
  lane.submit(1); await settle(); assert.equal(attempts, 2); assert.equal(errors, 1);
  let revision = 1; let release; const executed = [];
  const superseded = new LatestLane(async value => { executed.push(value); if (value === 1) throw new Error('busy'); }, value => value === revision, () => assert.fail('Unexpected failure'), () => new Promise(resolve => { release = resolve; }));
  superseded.submit(1); await settle(); revision = 2; superseded.submit(2); release(); await settle();
  assert.deepEqual(executed, [1, 2]);
});

test('automatic rebuild failures wait for a changed revision', () => {
  const gate = new AutomaticIndexGate();
  assert.equal(gate.claim('generation1:pending4:folder1'), true);
  assert.equal(gate.claim('generation1:pending4:folder1'), false);
  assert.equal(gate.claim('generation1:pending4:folder2'), true);
});

test('empty keyword results stay provisional while semantic setup or search is pending', () => {
  for (const phase of ['preparing', 'indexing', 'pending']) {
    const state = emptySearchState('lexical', phase);
    assert.equal(state.title, 'No keyword matches yet.');
    assert.match(state.detail, /preparing|indexing|Searching by meaning/);
    assert.doesNotMatch(state.title, /No matching files|No matches for this search/);
  }
});

test('only a completed hybrid search gives a final no-match message', () => {
  const complete = emptySearchState('hybrid', 'complete');
  assert.equal(complete.title, 'No matches for this search.');
  assert.match(complete.detail, /filters/);
  const rebuilding = emptySearchState('hybrid', 'indexing');
  assert.equal(rebuilding.title, 'No matches in the current index yet.');
  assert.match(rebuilding.detail, /may change/);
  for (const phase of ['preparing', 'indexing', 'pending', 'unavailable', 'no-content']) {
    assert.notEqual(emptySearchState('hybrid', phase).title, complete.title);
  }
});

test('no document content and unavailable semantics have actionable distinct guidance', () => {
  assert.match(emptySearchState('lexical', 'no-content').detail, /readable documents/);
  assert.match(emptySearchState('lexical', 'unavailable').detail, /retry the search/);
});


test('old committed semantic generation stays available during rebuild, activation readiness gates replacement', () => {
  assert.equal(semanticAvailable(null), false);
  assert.equal(semanticAvailable({ready: true, generation: null, embedding: true}), false);
  assert.equal(semanticAvailable({ready: true, generation: 1, embedding: false}), true);
  assert.equal(semanticAvailable({ready: true, generation: 1, embedding: true}), true);
  assert.equal(semanticAvailable({ready: false, generation: 2, embedding: true}), false);
  assert.equal(semanticAvailable({ready: true, generation: 2, embedding: false}), true);
  assert.equal(SEMANTIC_SETTLE_MS, 120);
});

test('scope snapshots freeze all filters independently of later control changes', () => {
  const controls = { extension: 'rs', folder: '/project' };
  const all = scopedFilters('all', controls);
  const code = scopedFilters('code', controls);
  controls.extension = 'pdf';
  assert.equal(all.code_only, false);
  assert.equal(code.code_only, true);
  assert.equal(code.extension, 'rs');
  assert.equal(code.folder, '/project');
  assert.throws(() => { code.code_only = false; }, TypeError);
  assert.throws(() => scopedFilters('unknown', {}), /scope/);
});
test('same-query scope change discards old lane output and runs latest scoped request', async () => {
  let revision = 1; let release; const seen = []; const accepted = [];
  const lane = new LatestLane(async request => {
    seen.push(request.filters.code_only);
    if (request.id === 1) await new Promise(resolve => { release = resolve; });
    if (request.id === revision) accepted.push(request);
  }, request => request.id === revision, () => assert.fail('Unexpected failure'));
  lane.submit({id: 1, query: 'parse configuration', filters: scopedFilters('all', {})});
  revision = 2;
  lane.submit({id: 2, query: 'parse configuration', filters: scopedFilters('code', {extension: 'rs'})});
  release(); await settle();
  assert.deepEqual(seen, [false, true]);
  assert.equal(accepted.length, 1);
  assert.equal(accepted[0].filters.code_only, true);
  assert.equal(accepted[0].filters.extension, 'rs');
});


test('exact music fields allow metadata-only searches without general filter browsing', () => {
  assert.equal(hasSearchInput('', scopedFilters('all', {media_artist: ' Artist '})), true);
  assert.equal(hasSearchInput('', scopedFilters('all', {media_title: 'Song'})), true);
  assert.equal(hasSearchInput('   ', scopedFilters('all', {media_artist: ' ', extension: 'mp3'})), false);
  assert.equal(hasSearchInput('violin', scopedFilters('all', {})), true);
});