import assert from 'node:assert/strict';
import test from 'node:test';
import vm from 'node:vm';
import { readFileSync } from 'node:fs';

const source = readFileSync(new URL('../chrome-extension/ltjt-order-assistant/lifecycle-adapters.js', import.meta.url), 'utf8')
  .replace('assistant.preflightLifecycleOperation = preflightLifecycleOperation;',
    'assistant.testWaitForStable = waitForStable; assistant.preflightLifecycleOperation = preflightLifecycleOperation;');
const background = readFileSync(new URL('../chrome-extension/ltjt-order-assistant/background.js', import.meta.url), 'utf8');

function fixture({ delays = [], onTick = () => {} } = {}) {
  let now = 0;
  let ticks = 0;
  const control = { name: 'jine1', id: 'jine1', type: 'text', value: 'private-value', isConnected: true };
  const document = { querySelectorAll: () => [], readyState: 'complete' };
  const window = { document, LTJTOrderAssistant: {}, jQuery: { active: 0 }, performance: { now: () => now },
    setTimeout(callback, ms) { now += delays[ticks] ?? ms; onTick({ now, ticks: ++ticks, control, form, window }); callback(); } };
  window.parent = window; document.defaultView = window;
  const form = { elements: [control], isConnected: true, ownerDocument: document };
  vm.runInNewContext(source, { window, Date: class extends Date { static now() { return now; } }, URL, URLSearchParams });
  const diagnostic = {};
  return { control, form, window, diagnostic, now: () => now,
    run: () => window.LTJTOrderAssistant.testWaitForStable(form, ['jine1', 'optional1'], 6000, diagnostic) };
}

test('ordinary linkage requires multiple observations over 1.5 seconds and redacts values', async () => {
  const f = fixture();
  assert.equal(await f.run(), true);
  assert.equal(f.now(), 1500);
  assert.ok(f.diagnostic.sample_count >= 3);
  assert.equal(f.diagnostic.ready, true);
  assert.equal(f.diagnostic.reason, 'stable');
  assert.equal(JSON.stringify(f.diagnostic).includes('private-value'), false);
});

test('one delayed callback restarts observation instead of failing or counting the blind interval', async () => {
  const f = fixture({ delays: [6000] });
  assert.equal(await f.run(), true);
  assert.equal(f.now(), 7500);
  assert.equal(f.diagnostic.delayed_sample_count, 1);
  assert.equal(f.diagnostic.max_sample_gap_ms, 6000);
  assert.equal(f.diagnostic.stable_ms, 1500);
});

test('one-second sampling still proves stability; persistent long gaps fail boundedly', async () => {
  const slower = fixture({ delays: [1000, 1000] });
  assert.equal(await slower.run(), true);
  assert.equal(slower.now(), 2000);
  const paused = fixture({ delays: Array(6).fill(6000) });
  assert.equal(await paused.run(), false);
  assert.equal(paused.now(), 30000);
  assert.equal(paused.diagnostic.reason, 'sampling_delayed');
  assert.equal(paused.diagnostic.stable_ms, 0);
});

test('continuous value changes fail and report field names rather than their values', async () => {
  const f = fixture({ onTick: ({ control, ticks }) => { control.value = `secret-${ticks}`; } });
  assert.equal(await f.run(), false);
  assert.equal(f.now(), 6000);
  assert.equal(f.diagnostic.reason, 'fields_changing');
  assert.deepEqual([...f.diagnostic.changed_fields], ['jine1']);
  assert.equal(JSON.stringify(f.diagnostic).includes('secret-'), false);
});

test('the last allowed sample is checked; a late change restarts stability', async () => {
  const f = fixture({ onTick: ({ now, control }) => { if (now <= 4500) control.value = String(now); } });
  assert.equal(await f.run(), true);
  assert.equal(f.now(), 6000);
  const late = fixture({ delays: [6000], onTick: ({ now, control }) => { if (now === 7250) control.value = 'late'; } });
  assert.equal(await late.run(), true);
  assert.equal(late.now(), 8750);
});

test('detached form, missing/replaced controls and pending native Ajax cannot pass', async () => {
  for (const mutate of [
    ({ form }) => { form.isConnected = false; },
    ({ form }) => { form.elements = []; },
    ({ form, control }) => { form.elements = [{ ...control }]; },
    ({ control }) => { control.isConnected = false; }
  ]) {
    const f = fixture({ onTick: mutate });
    assert.equal(await f.run(), false);
    assert.match(f.diagnostic.reason, /form_detached|control_unavailable/);
  }
  const busy = fixture(); busy.window.jQuery.active = 1;
  assert.equal(await busy.run(), false);
  assert.equal(busy.diagnostic.reason, 'native_busy');
  const finishes = fixture({ onTick: ({ now, window }) => { if (now >= 1000) window.jQuery.active = 0; } });
  finishes.window.jQuery.active = 1;
  assert.equal(await finishes.run(), true);
  assert.equal(finishes.now(), 2500);
  const late = fixture({ onTick: ({ now, window }) => { if (now >= 5500) window.jQuery.active = 0; } });
  late.window.jQuery.active = 1;
  assert.equal(await late.run(), false);
  assert.equal(late.diagnostic.reason, 'native_busy', 'late Ajax completion is not evidence of oscillating field values');
  assert.equal(late.diagnostic.native_busy, false);
  assert.ok(late.diagnostic.native_busy_sample_count > 0);
});

test('background reports the observed failure reason without classifying all failures as changing fields', () => {
  const start = background.indexOf('function arrangementLinkageFailureMessage(');
  const end = background.indexOf('\nfunction lifecycleLiveBusinessFailure(', start);
  const message = vm.runInNewContext(`${background.slice(start, end)}; arrangementLinkageFailureMessage;`);
  for (const [reason, expected] of [['sampling_delayed', '检测持续延迟'], ['fields_changing', '联动字段在观察期间未稳定'],
    ['native_busy', '联动请求'], ['form_detached', '关闭或刷新'], ['control_unavailable', '控件']]) {
    const result = message({ blockers: ['arrangement_create_linked_fields_not_stable'], preflight: { arrangement_linkage: { reason } } });
    assert.ok(result.includes(expected)); assert.ok(result.includes('未提交 ERP 保存'));
  }
  assert.equal(message({ blockers: ['other_error'] }), '');
  assert.equal(message({ blockers: ['arrangement_create_linked_fields_not_stable'] }), '');
  assert.match(background, /failure_message: linkageFailureMessage/);
});