import test from 'node:test';
import assert from 'node:assert/strict';
import { SearchMeasurement, measuredFailure, spanDepth, briefMs } from '../src/search-performance.ts';

const finish = (trace, lane, start, end, metrics, failed) => trace.completed(trace.begin(lane, start), end, metrics, failed);

const native = { total_ms: 12, result_count: 2, trace: [], dropped_spans: 0 };

test('separates debounce, intentional semantic delay, queue, invoke and DOM update', () => {
  const trace = new SearchMeasurement(100, 165, true);
  trace.submitted('lexical', 165);
  finish(trace, 'lexical', 180, 200, native, false);
  trace.displayed('lexical', 200, 203, 2);
  trace.submitted('hybrid', 515);
  finish(trace, 'hybrid', 520, 550, native, false);
  trace.displayed('hybrid', 550, 554, 3);
  const report = trace.export();
  assert.equal(report.debounce_ms, 65);
  assert.equal(report.lane_schedule_ms.hybrid, 350);
  assert.equal(report.attempts[0].queued_ms, 15);
  assert.equal(report.attempts[0].invoke_ms, 20);
  assert.equal(report.attempts[0].transport_estimate_ms, 8);
  assert.equal(report.displays[0].dom_update_ms, 3);
  assert.equal(report.first_results_ms, 103);
  assert.equal(report.hybrid_final_results_ms, 454);
});

test('failed attempt timings survive retry and lexical response does not pretend hybrid completion', () => {
  const trace = new SearchMeasurement(0, 0, true);
  trace.submitted('lexical', 0);
  finish(trace, 'lexical', 0, 2, native, true);
  finish(trace, 'lexical', 402, 414, native, false);
  trace.displayed('lexical', 414, 415, 2);
  const report = trace.export();
  assert.equal(report.attempts[1].retry_wait_ms, 400);
  assert.equal(report.attempts[0].failed, true);
  assert.equal(report.attempts[0].transport_estimate_ms, 0);
  assert.equal(report.hybrid_final_results_ms, null);
  assert.equal(report.latest_displayed_ms, 415);
  assert.equal(measuredFailure({message: 'worker busy', metrics: native}).message, 'worker busy');
  assert.equal(measuredFailure('legacy failure'), null);
});

test('debug history is bounded and first response survives dropped displays', () => {
  const context = { device: 'cpu', threads: 1 };
  const trace = new SearchMeasurement(0, 0, true, context);
  context.threads = 8;
  for (let i = 0; i < 40; i++) {
    finish(trace, 'hybrid', i, i + 1, native, false);
    trace.displayed('hybrid', i, i + 1, 1);
  }
  const report = trace.export();
  assert.equal(report.attempts.length, 32);
  assert.equal(report.displays.length, 16);
  assert.equal(report.dropped_attempts, 8);
  assert.equal(report.dropped_displays, 24);
  assert.equal(report.first_results_ms, 1);
  assert.equal(report.context.threads, 1);
  assert.doesNotMatch(JSON.stringify(report), /query|filename|snippet|ended_at/);
});

test('cyclic or invalid native span parents cannot hang hierarchy rendering', () => {
  const spans = [{parent: 1}, {parent: 0}, {parent: 99}];
  assert.equal(spanDepth(spans, 0), 1);
  assert.equal(spanDepth(spans, 2), 0);
});

test('a later refresh has queue timing rather than being misreported as a busy retry', () => {
  const trace = new SearchMeasurement(0, 0, true);
  trace.submitted('hybrid', 350);
  finish(trace, 'hybrid', 350, 360, native, false);
  trace.submitted('hybrid', 1000);
  finish(trace, 'hybrid', 1010, 1020, native, false);
  assert.equal(trace.export().attempts[1].queued_ms, 10);
  assert.equal(trace.export().attempts[1].retry_wait_ms, 0);
  assert.equal(briefMs(.44), '<1');
  assert.equal(briefMs(3.14), '3.1');
});

test('new submission after a failure measures pending queue rather than retry wait', () => {
  const trace = new SearchMeasurement(0, 0, true);
  trace.submitted('hybrid', 350);
  finish(trace, 'hybrid', 350, 360, native, true);
  trace.submitted('hybrid', 1000);
  finish(trace, 'hybrid', 1010, 1020, native, false);
  assert.equal(trace.export().attempts[1].queued_ms, 10);
  assert.equal(trace.export().attempts[1].retry_wait_ms, 0);
});

test('an in-flight attempt keeps its captured submission when a refresh queues', () => {
  const trace = new SearchMeasurement(0, 0, true);
  trace.submitted('hybrid', 350);
  const active = trace.begin('hybrid', 355);
  trace.submitted('hybrid', 1000);
  trace.completed(active, 1005, native, true);
  finish(trace, 'hybrid', 1010, 1020, native, false);
  const attempts = trace.export().attempts;
  assert.equal(attempts[0].queued_ms, 5);
  assert.equal(attempts[1].queued_ms, 10);
  assert.equal(attempts[1].retry_wait_ms, 0);
  assert.notEqual(attempts[0].submission, attempts[1].submission);
});