// tests/lib/plan-version-1-9-docs.test.mjs
// plan_version 1.9 is the current target, and the contract docs follow it:
// Handover 4, the plan template and CLAUDE.md name 1.9 and its rule, "the file
// first on every line"; the template, /trekplan and the planning orchestrator
// say every path stands before any annotation; and the rules introduced at 1.8,
// which still bind 1.8 and 1.9 plans, say "1.8 or later" in the sentence that
// carries each of them (never "1.9", which would release a 1.8 plan from them).

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

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..', '..');
const read = (rel) => readFileSync(join(ROOT, rel), 'utf-8');

const RULE = 'file first on every line';
const ANNOTATION = 'every path stands before any annotation';
const NEW_CODES = ['PLAN_STEP_PATH_NOT_FIRST', 'PLAN_STEP_PATH_NOT_A_PATH', 'PLAN_STEP_PATH_UNTICKED'];

// Sentence boundaries: a full stop or question mark before whitespace, a blank
// line, or the start of a list item. "1.8" and ".mjs" are no boundary.
const BOUNDARY = /[.?!](?=\s)|\n[ \t>]*\n|\n[ \t>]*[-*] /g;

/**
 * The sentence of `text` that holds the first match of `anchor`: from the
 * boundary before the match to the first boundary after it.
 */
function sentence(text, anchor, label) {
  const m = anchor.exec(text);
  assert.ok(m, `${label}: anchor ${anchor} not found`);
  let start = 0;
  let end = text.length;
  for (const b of text.matchAll(BOUNDARY)) {
    const bEnd = b.index + b[0].length;
    if (bEnd <= m.index) start = bEnd;
    else if (b.index >= m.index + m[0].length) { end = b.index; break; }
  }
  return text.slice(start, end);
}

function holds18OrLater(text, anchor, label) {
  const s = sentence(text, anchor, label);
  assert.match(s, /1\.8 or later/, `${label} must say "1.8 or later" in the sentence that carries the rule: ${JSON.stringify(s)}`);
  assert.doesNotMatch(s, /1\.9/, `${label} is a 1.8 rule that still binds 1.8 plans; it must not say 1.9: ${JSON.stringify(s)}`);
}

const handover4 = () => {
  const c = read('docs/HANDOVER-CONTRACTS.md');
  const start = c.indexOf('## Handover 4');
  assert.ok(start >= 0, '## Handover 4 missing');
  return c.slice(start, c.indexOf('## Handover 5', start));
};

const claudeRow = () => {
  const m = /^\| `\/trekplan` \|.*$/m.exec(read('CLAUDE.md'));
  assert.ok(m, 'CLAUDE.md has no /trekplan row');
  return m[0];
};

test('PLAN_VERSION_CURRENT is 1.9', () => {
  assert.equal(PLAN_VERSION_CURRENT, '1.9');
});

test('Handover 4 names plan_version 1.9 and the "file first on every line" rule', () => {
  const h4 = handover4();
  assert.match(h4, /plan_version 1\.9/);
  assert.ok(h4.includes(RULE), `Handover 4 must name the rule "${RULE}"`);
  assert.match(h4, /`"1\.9"` \(current\), `"1\.8"` \(valid\), `"1\.7"` \(valid\)/);
});

test('the plan template declares plan_version 1.9 and states the rule', () => {
  const t = read('templates/plan-template.md');
  assert.ok(t.includes('`plan_version: 1.9` · `ceremony:'), 'the template header line names plan_version 1.9');
  assert.ok(t.includes(RULE), `the template must state the rule "${RULE}"`);
});

test('CLAUDE.md /trekplan row names Plan 1.9 and the rule, and labels the Test first / End-to-end rules "From 1.8"', () => {
  const row = claudeRow();
  assert.match(row, /Plan 1\.9: the file first on every line/);
  assert.match(row, /From 1\.8: `Test first:` per step \+ one `End-to-end:` step/);
  assert.doesNotMatch(row, /Plan 1\.8:/);
});

test('the template, /trekplan and the planning orchestrator say every path stands before any annotation', () => {
  for (const rel of ['templates/plan-template.md', 'commands/trekplan.md', 'agents/planning-orchestrator.md']) {
    assert.ok(read(rel).includes(ANNOTATION), `${rel} must say "${ANNOTATION}"`);
  }
});

test('the plan template: the Test first and End-to-end rules say "1.8 or later" in their own sentence', () => {
  const t = read('templates/plan-template.md');
  holds18OrLater(t, /Every step has\s+`Test first:`/, 'template Test first sentence');
  holds18OrLater(t, /without an\s+`End-to-end:`\s+step is invalid/, 'template End-to-end sentence');
});

test('plan-critic: the Test first check says "1.8 or later" in its own sentence', () => {
  holds18OrLater(read('agents/plan-critic.md'), /does every step's\s+`Test first:`\s+name a test/, 'plan-critic Test first check');
});

test('design template: the opening line and the --strict line say "1.8 or later"', () => {
  const d = read('templates/design-template.md');
  holds18OrLater(d, /The design part of a plan/, 'design template opening line');
  holds18OrLater(d, /`plan-validator --strict` checks/, 'design template --strict line');
});

test('HANDOVER-CONTRACTS: the design-part line and invariant 5 say "1.8 or later"; invariant 7 reads the Test first File line', () => {
  // The design-part line stands in Handover 3 (it tells the external slot from
  // the plan's own design); invariants 5 and 7 stand in Handover 4.
  holds18OrLater(read('docs/HANDOVER-CONTRACTS.md'), /A plan's own design/, 'HANDOVER-CONTRACTS design-part line');
  const h4 = handover4();
  holds18OrLater(h4, /\(1\.7 plans are not held to these\)/, 'Handover 4 invariant 5');
  const bullet = sentence(h4, /\*\*A step of only tests\*\*/, 'Handover 4 invariant 7 tests-only bullet');
  assert.ok(bullet.includes('a file on its `Test first:` `File:` line'),
    `invariant 7 must say "a file on its \`Test first:\` \`File:\` line": ${JSON.stringify(bullet)}`);
  assert.ok(!bullet.includes('its `Test first:` file,'), 'invariant 7 no longer says "its `Test first:` file"');
});

test('/trekplan: the 1.8 additions heading says "1.8 or later", and a separate 1.9 additions block follows it', () => {
  const p = read('commands/trekplan.md');
  const h18 = p.indexOf('**plan_version 1.8 or later additions**');
  assert.ok(h18 >= 0, 'the heading reads "**plan_version 1.8 or later additions**"');
  assert.ok(!p.includes('**plan_version 1.8 additions**'), 'the old 1.8-only heading is gone');
  const h19 = p.indexOf('**plan_version 1.9 additions**');
  assert.ok(h19 > h18, 'a separate "**plan_version 1.9 additions**" block stands after the 1.8 block');
  const end = p.indexOf('\n>\n> **', h19);
  const block = p.slice(h19, end < 0 ? undefined : end);
  assert.ok(block.includes(ANNOTATION), `the 1.9 block says "${ANNOTATION}"`);
});

test('the template\'s own example steps validate as 1.9 with none of the new path codes', () => {
  const r = validatePlanContent(read('templates/plan-template.md'));
  assert.equal(r.parsed.planVersion, '1.9');
  const found = [...r.errors, ...r.warnings].map((i) => i.code).filter((c) => NEW_CODES.includes(c));
  assert.deepEqual(found, [], JSON.stringify([...r.errors, ...r.warnings].filter((i) => NEW_CODES.includes(i.code)), null, 2));
  const soft = validatePlanContent(read('templates/plan-template.md'), { strict: false });
  assert.deepEqual([...soft.errors, ...soft.warnings].map((i) => i.code).filter((c) => NEW_CODES.includes(c)), []);
});