import { describe, it, expect } from 'vitest';
import { normalizeSubject, normalizeMessage } from '../normalize-commit-msg.js';

describe('normalizeSubject', () => {
  it('passes an already-valid subject unchanged', () => {
    const { subject, warned } = normalizeSubject('Add feature flag support');
    expect(subject).toBe('Add feature flag support');
    expect(warned).toBe(false);
  });

  it('capitalizes the first letter', () => {
    const { subject } = normalizeSubject('add feature flag support');
    expect(subject).toBe('Add feature flag support');
  });

  it('strips a trailing period', () => {
    const { subject } = normalizeSubject('Add feature flag support.');
    expect(subject).toBe('Add feature flag support');
  });

  it('trims leading whitespace', () => {
    const { subject } = normalizeSubject('  Fix the bug');
    expect(subject).toBe('Fix the bug');
  });

  it('trims trailing whitespace', () => {
    const { subject } = normalizeSubject('Fix the bug   ');
    expect(subject).toBe('Fix the bug');
  });

  it('capitalizes and strips period together', () => {
    const { subject } = normalizeSubject('fix the bug.');
    expect(subject).toBe('Fix the bug');
  });

  it('does not strip a period that is not trailing', () => {
    const { subject } = normalizeSubject('Fix bug in v1.0 release');
    expect(subject).toBe('Fix bug in v1.0 release');
  });

  it('warns when subject exceeds 72 characters', () => {
    const long = 'A'.repeat(73);
    const { warned } = normalizeSubject(long);
    expect(warned).toBe(true);
  });

  it('does not warn when subject is exactly 72 characters', () => {
    const exact = 'A'.repeat(72);
    const { warned } = normalizeSubject(exact);
    expect(warned).toBe(false);
  });

  it('does not warn when subject is under 72 characters', () => {
    const { warned } = normalizeSubject('Short message');
    expect(warned).toBe(false);
  });

  it('handles an empty subject gracefully', () => {
    const { subject, warned } = normalizeSubject('');
    expect(subject).toBe('');
    expect(warned).toBe(false);
  });
});

describe('normalizeMessage', () => {
  it('normalizes only the subject line of a multi-line message', () => {
    const input = 'fix the bug.\n\nThis is the body paragraph.';
    const { message } = normalizeMessage(input);
    expect(message).toBe('Fix the bug\n\nThis is the body paragraph.');
  });

  it('skips comment lines when finding the subject', () => {
    const input = '# Comment\nfix the bug.';
    const { message } = normalizeMessage(input);
    expect(message).toBe('# Comment\nFix the bug');
  });

  it('returns warned true for long subject inside full message', () => {
    const longSubject = 'x'.repeat(73);
    const input = `${longSubject}\n\nBody.`;
    const { warned } = normalizeMessage(input);
    expect(warned).toBe(true);
  });

  it('preserves body lines exactly as-is', () => {
    const input = 'Fix bug\n\n  - detail one\n  - detail two.';
    const { message } = normalizeMessage(input);
    expect(message).toBe('Fix bug\n\n  - detail one\n  - detail two.');
  });
});