import { describe, it, expect } from 'vitest';
import { extractVersion, extractCrossRefs, detectMismatches } from './cross-ref-checker.mjs';

describe('extractVersion', () => {
  it('extracts version from header', () => {
    const text = '# Pravila v1.30 от 18.05.2026';
    expect(extractVersion(text)).toBe('1.30');
  });

  it('returns null if no version', () => {
    expect(extractVersion('# Untitled')).toBeNull();
  });
});

describe('extractCrossRefs', () => {
  it('extracts cross-refs like "Pravila v1.29"', () => {
    const text = 'See Pravila v1.29 and Tooling v2.15.';
    const refs = extractCrossRefs(text);
    expect(refs).toContainEqual({ name: 'Pravila', version: '1.29' });
    expect(refs).toContainEqual({ name: 'Tooling', version: '2.15' });
  });

  it('link-based primary: first bold version after markdown-link to normative file', () => {
    const text =
      '| Правила | [docs/Pravila_raboty_Claude_v1_1.md](docs/Pravila_raboty_Claude_v1_1.md) (**v1.31 от 19.05.2026** — описание; v1.30 наследие; v1.29 наследие) |';
    const refs = extractCrossRefs(text);
    expect(refs).toEqual([{ name: 'Pravila', version: '1.31' }]);
  });

  it('link-based primary: extracts version even if bold contains preceding words (e.g. "Прил. Н")', () => {
    const text =
      '| Реестр | [docs/Tooling_v8_3.md](docs/Tooling_v8_3.md) (**Прил. Н v2.17 от 19.05.2026** — описание) |';
    const refs = extractCrossRefs(text);
    expect(refs).toEqual([{ name: 'Tooling', version: '2.17' }]);
  });

  it('link-based primary: §0 table with multiple normative files', () => {
    const text = [
      '| Pravila | [docs/Pravila_raboty_Claude_v1_1.md](docs/Pravila_raboty_Claude_v1_1.md) (**v1.31** ...) |',
      '| Tooling | [docs/Tooling_v8_3.md](docs/Tooling_v8_3.md) (**Прил. Н v2.17** ...) |',
      '| PSR_v1 | [docs/Plugin_stack_rules_v1.md](docs/Plugin_stack_rules_v1.md) (**v3.16** ...) |',
    ].join('\n');
    const refs = extractCrossRefs(text);
    expect(refs).toEqual([
      { name: 'Pravila', version: '1.31' },
      { name: 'Tooling', version: '2.17' },
      { name: 'PSR_v1', version: '3.16' },
    ]);
  });

  it('dedupe per target: only first ref per target name is kept', () => {
    const text =
      'header: Tooling v2.17; legacy: Tooling v2.16 наследие; older: Tooling v2.15 наследие';
    const refs = extractCrossRefs(text);
    expect(refs.filter((r) => r.name === 'Tooling')).toEqual([
      { name: 'Tooling', version: '2.17' },
    ]);
  });

  it('skips left side of arrow transition "v1.30→**v1.31**"', () => {
    const text = 'cross-refs: Pravila v1.30→**v1.31**';
    const refs = extractCrossRefs(text);
    expect(refs.filter((r) => r.name === 'Pravila')).toHaveLength(0);
  });

  it('skips arrow with whitespace: "v1.30 → v1.31"', () => {
    const text = 'transition: Pravila v1.30 → v1.31 happened today';
    const refs = extractCrossRefs(text);
    expect(refs.filter((r) => r.name === 'Pravila')).toHaveLength(0);
  });

  it('link-based wins over fallback when both present', () => {
    const text = [
      'Body mentions Pravila v1.25 in some sentence.',
      '| Pravila | [docs/Pravila_raboty_Claude_v1_1.md](docs/Pravila_raboty_Claude_v1_1.md) (**v1.31** current) |',
    ].join('\n');
    const refs = extractCrossRefs(text);
    expect(refs.filter((r) => r.name === 'Pravila')).toEqual([
      { name: 'Pravila', version: '1.31' },
    ]);
  });

  it('fallback scope-cuts at first "**vN.M наследие**" history marker', () => {
    const text =
      'header refs: Tooling v2.17\n\n**v2.16 наследие:** old refs Tooling v2.15';
    const refs = extractCrossRefs(text);
    expect(refs).toEqual([{ name: 'Tooling', version: '2.17' }]);
  });

  it('fallback scope-cuts at first "**Что изменилось в vN.M относительно**" marker', () => {
    const text = [
      '**Версия:** v1.31',
      '',
      '**Что изменилось в v1.31 относительно v1.30:** ADR-011',
      '',
      '**Что изменилось в v1.29 относительно v1.28:** Связано: Tooling v2.15',
    ].join('\n');
    const refs = extractCrossRefs(text);
    expect(refs.filter((r) => r.name === 'Tooling')).toEqual([]);
  });

  it('fallback scope-cuts at first "**vN.M** — " bold-dash marker', () => {
    const text = '**v3.16** — current changes\n**v3.15** — Связано: Tooling v2.15';
    const refs = extractCrossRefs(text);
    expect(refs.filter((r) => r.name === 'Tooling')).toEqual([]);
  });

  it('link-based catches refs even when scope cut would exclude them', () => {
    const text = [
      'shapka with **v2.17 наследие** description body',
      '| Pravila | [docs/Pravila_raboty_Claude_v1_1.md](docs/Pravila_raboty_Claude_v1_1.md) (**v1.31** current) |',
    ].join('\n');
    const refs = extractCrossRefs(text);
    expect(refs).toContainEqual({ name: 'Pravila', version: '1.31' });
  });
});

describe('detectMismatches', () => {
  it('detects when fileA references fileB v1.29 but fileB header is v1.30', () => {
    const files = {
      'A.md': '# A v1.0 — cross-refs: Pravila v1.29',
      'docs/Pravila_raboty_Claude_v1_1.md': '# Pravila v1.30',
    };
    const m = detectMismatches(files);
    expect(m).toHaveLength(1);
    expect(m[0].from).toBe('A.md');
    expect(m[0].to).toBe('Pravila');
    expect(m[0].expected).toBe('1.30');
    expect(m[0].found).toBe('1.29');
  });

  it('passes when in sync', () => {
    const files = {
      'A.md': '# A v1.0 — Pravila v1.30',
      'docs/Pravila_raboty_Claude_v1_1.md': '# Pravila v1.30',
    };
    expect(detectMismatches(files)).toHaveLength(0);
  });

  it('ignores «наследие» chain when current link-ref matches header', () => {
    const files = {
      'CLAUDE.md':
        '**Версия:** 2.18 — §0 cross-refs Pravila v1.30→**v1.31** / Tooling v2.16→**v2.17**\n\n| Правила | [docs/Pravila_raboty_Claude_v1_1.md](docs/Pravila_raboty_Claude_v1_1.md) (**v1.31** current; v1.30 наследие; v1.29 наследие) |',
      'docs/Pravila_raboty_Claude_v1_1.md': '**Версия:** v1.31 — current',
    };
    expect(detectMismatches(files)).toEqual([]);
  });

  it('detects real drift when link-based cross-ref is stale', () => {
    const files = {
      'CLAUDE.md':
        '| Pravila | [docs/Pravila_raboty_Claude_v1_1.md](docs/Pravila_raboty_Claude_v1_1.md) (**v1.30** description) |',
      'docs/Pravila_raboty_Claude_v1_1.md': '**Версия:** v1.31 — current',
    };
    const m = detectMismatches(files);
    expect(m).toHaveLength(1);
    expect(m[0].from).toBe('CLAUDE.md');
    expect(m[0].to).toBe('Pravila');
    expect(m[0].found).toBe('1.30');
    expect(m[0].expected).toBe('1.31');
  });
});