// tests/lib/test-first-multi-file.test.mjs
// Plan step 3 (files-backticks trial 4): below plan_version 1.9 every test file
// on the `Test first:` `File:` line is read, not only the first backticked
// span. 6.3.1 read the first span alone, so a step whose `Files:` were its two
// `Test first:` files was not seen as tests-only when the second file is not a
// test by its path. One reading: testFirstFiles (plan-schema.mjs), used by
// stepTestsOnly; the executor and the step helper say the same in prose.

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { readFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import * as m from '../../lib/parsers/plan-schema.mjs';
import { validatePlanContent } from '../../lib/validators/plan-validator.mjs';
import { buildPlan } from '../helpers/plan-v18-builder.mjs';

const HERE = dirname(fileURLToPath(import.meta.url));
const ROOT = join(HERE, '..', '..');

/** A 1.8-shaped step section: `Files:` and the `Test first:` lines given. */
const step = (files, testFirst) => [
  '### Step 1: x', '',
  `- **Files:** ${files}`,
  '- **Changes:** x',
  '- **Test first:**',
  ...testFirst,
  '- **Verify:** `node --test tests/a.test.mjs` -> expected: exit 0',
].join('\n');

const TWO = step('`tests/a.test.mjs`, `checks/smoke.mjs`', [
  '  - File: `tests/a.test.mjs`, `checks/smoke.mjs` (new)',
  '  - Verifies: both checks run',
]);

const testFirstFiles = (body, version) => {
  assert.equal(typeof m.testFirstFiles, 'function', 'plan-schema.mjs exports testFirstFiles');
  return m.testFirstFiles(m.parseStepFields(body), version);
};

test('a 1.8 step whose Files are its two Test first files is tests-only', () => {
  // checks/smoke.mjs is not a test by its path: only the Test first line makes it one.
  assert.equal(m.stepTestsOnly(TWO).testsOnly, true, JSON.stringify(m.stepTestsOnly(TWO)));
});

test('testFirstFiles returns every path on the File: line, below 1.9 and without a version', () => {
  assert.deepEqual(testFirstFiles(TWO, '1.8'), ['tests/a.test.mjs', 'checks/smoke.mjs']);
  assert.deepEqual(testFirstFiles(TWO, null), ['tests/a.test.mjs', 'checks/smoke.mjs']);
  assert.deepEqual(testFirstFiles(TWO), ['tests/a.test.mjs', 'checks/smoke.mjs']);
});

test('testFirstFiles: a call, an option or a URL on the File: line is not read; paths are normalised and deduplicated', () => {
  const body = step('`tests/a.test.mjs`', [
    '  - File: `tests/a.test.mjs`, `parse()`, `--watch`, `https://example.invalid/x.mjs`, `./tests/a.test.mjs`',
    '  - Verifies: x',
  ]);
  assert.deepEqual(testFirstFiles(body, '1.8'), ['tests/a.test.mjs']);
});

test('testFirstFiles: a Verifies: line, or a span before File: on the line, is never read', () => {
  const body = step('`tests/a.test.mjs`', [
    '  - see `lib/before.mjs` File: `tests/a.test.mjs`',
    '  - Verifies: `lib/other.mjs` returns `src/x.mjs`',
  ]);
  assert.deepEqual(testFirstFiles(body, '1.8'), ['tests/a.test.mjs']);
  const none = step('`tests/a.test.mjs`', ['  - Verifies: `tests/a.test.mjs` runs']);
  assert.deepEqual(testFirstFiles(none, '1.8'), []);
});

test('a code file beside the test on the File: line still makes the step not tests-only when Files has more', () => {
  const body = step('`tests/a.test.mjs`, `src/cli.mjs`', [
    '  - File: `tests/a.test.mjs`, `parse()` (new)',
    '  - Verifies: x',
  ]);
  assert.equal(m.stepTestsOnly(body).testsOnly, false);
});

test('prose: the executor and the step helper name every file on the Test first File: line', () => {
  const phrase = 'every file on the `Test first:` `File:` line';
  for (const rel of [['commands', 'trekexecute.md'], ['agents', 'step-implementer.md']]) {
    const text = readFileSync(join(ROOT, ...rel), 'utf8');
    assert.ok(text.includes(phrase), `${rel.join('/')} says "${phrase}"`);
  }
});

// ---- plan_version 1.9 (plan step 5) ----------------------------------------
// From 1.9 a `Test first:` `File:` line is every line that opens with `File:`
// (after an optional list marker and `**`), backticked or not, and its rest is
// one entry read by entryPaths: the leading backticked paths are the test
// files, the rest is description. The validator puts the same grammar on it.

const PATH_CODES = ['PLAN_STEP_PATH_NOT_FIRST', 'PLAN_STEP_PATH_NOT_A_PATH'];
// A plan of the given version whose first step has `Files:` `files` and the
// `Test first:` `File:` line `fileLine` (both verbatim).
const planWith = (version, files, fileLine) => buildPlan({
  version,
  steps: [{ filesRaw: files, testFirstRaw: fileLine }, { endToEnd: 'bash tests/e2e.sh' }],
});

test('1.9: every leading backticked path on the File: line is a test file', () => {
  const body = step('`tests/a.test.mjs`, `tests/b.test.mjs`', [
    '  - File: `tests/a.test.mjs`, `tests/b.test.mjs` (new)',
    '  - Verifies: x',
  ]);
  assert.deepEqual(testFirstFiles(body, '1.9'), ['tests/a.test.mjs', 'tests/b.test.mjs']);
});

test('1.9: a backticked path in the description of the File: line is not a test file', () => {
  const body = step('`tests/a.test.mjs`', [
    '  - File: `tests/a.test.mjs` (new), covers `tests/b.test.mjs`',
    '  - Verifies: x',
  ]);
  assert.deepEqual(testFirstFiles(body, '1.9'), ['tests/a.test.mjs']);
  // Below 1.9 the line is read as 6.3.1 + Step 3 read it: every path-shaped span.
  assert.deepEqual(testFirstFiles(body, '1.8'), ['tests/a.test.mjs', 'tests/b.test.mjs']);
});

test('1.9: a code file named only in the File: line description keeps the step from being tests-only; in 1.8 it is tests-only', () => {
  const files = '`tests/a.test.mjs`, `checks/smoke.mjs`';
  const line = '  - File: `tests/a.test.mjs` (new), covers `checks/smoke.mjs`';
  const body = step(files, [line, '  - Verifies: x']);
  assert.equal(m.stepTestsOnly(body, '1.9').testsOnly, false, JSON.stringify(m.stepTestsOnly(body, '1.9')));
  assert.equal(m.stepTestsOnly(body, '1.8').testsOnly, true, JSON.stringify(m.stepTestsOnly(body, '1.8')));

  const v19 = validatePlanContent(planWith('1.9', files, line));
  assert.ok(!v19.warnings.some((w) => w.code === 'PLAN_STEP_TESTS_ONLY'), JSON.stringify(v19.warnings));
  assert.deepEqual(v19.errors.filter((e) => PATH_CODES.includes(e.code)), [], JSON.stringify(v19.errors));
  const v18 = validatePlanContent(planWith('1.8', files, line));
  assert.ok(v18.warnings.some((w) => w.code === 'PLAN_STEP_TESTS_ONLY'), JSON.stringify(v18.warnings));
});

test('1.9: a File: line that opens with `parse()` is refused as no path (error strict, warning soft)', () => {
  const text = planWith('1.9', '`tests/a.test.mjs`', '  - File: `parse()`');
  const strict = validatePlanContent(text);
  const e = strict.errors.find((i) => i.code === 'PLAN_STEP_PATH_NOT_A_PATH');
  assert.ok(e, JSON.stringify(strict.errors));
  assert.match(e.message, /Step 1/);
  assert.match(e.message, /Test first/);
  const soft = validatePlanContent(text, { strict: false });
  assert.ok(soft.warnings.some((w) => w.code === 'PLAN_STEP_PATH_NOT_A_PATH'), JSON.stringify(soft.warnings));
  assert.deepEqual(soft.errors.filter((i) => PATH_CODES.includes(i.code)), []);
});

test('1.9: an unticked File: line gets PLAN_STEP_PATH_NOT_FIRST next to PLAN_STEP_NO_TEST_FIRST', () => {
  const r = validatePlanContent(planWith('1.9', '`tests/a.test.mjs`', '  - File: tests/a.test.mjs'));
  const codes = r.errors.map((e) => e.code);
  assert.ok(codes.includes('PLAN_STEP_PATH_NOT_FIRST'), codes.join(','));
  assert.ok(codes.includes('PLAN_STEP_NO_TEST_FIRST'), codes.join(','));
  const e = r.errors.find((i) => i.code === 'PLAN_STEP_PATH_NOT_FIRST');
  assert.match(e.message, /Step 1/);
  assert.match(e.message, /tests\/a\.test\.mjs/);
});