import { describe, it, expect } from 'vitest';
import { tokenizeBash, isMutatingSegment } from './bash-tokenizer.mjs';

describe('tokenizeBash — basics', () => {
  it('tokenizes a simple command', () => {
    const r = tokenizeBash('ls -la /tmp');
    expect(r.ok).toBe(true);
    expect(r.segments).toHaveLength(1);
    expect(r.segments[0].tokens).toEqual(['ls', '-la', '/tmp']);
    expect(r.hasSubshell).toBe(false);
  });

  it('returns ok:false on empty input', () => {
    expect(tokenizeBash('').ok).toBe(false);
    expect(tokenizeBash('   ').ok).toBe(false);
    expect(tokenizeBash(null).ok).toBe(false);
  });
});

describe('tokenizeBash — segments & operators', () => {
  it('splits on && and records the operator', () => {
    const r = tokenizeBash('ls && git commit');
    expect(r.segments.map((s) => s.tokens[0])).toEqual(['ls', 'git']);
    expect(r.segments[0].op).toBe('&&');
    expect(r.segments[1].op).toBe(null);
  });

  it('splits on pipe', () => {
    const r = tokenizeBash('cat a | grep x');
    expect(r.segments).toHaveLength(2);
    expect(r.segments[0].op).toBe('|');
  });
});

describe('tokenizeBash — sub-shell detection', () => {
  it.each([
    ['echo `ls`', 'backtick'],
    ['echo $(ls)', 'cmd-subst'],
    ['diff <(ls a) <(ls b)', 'process-subst-in'],
    ['cat <<EOF\nx\nEOF', 'heredoc'],
  ])('flags %s', (cmd, kind) => {
    const r = tokenizeBash(cmd);
    expect(r.ok).toBe(true);
    expect(r.hasSubshell).toBe(true);
    expect(r.subshellKinds).toContain(kind);
  });

  it('does not flag plain command', () => {
    expect(tokenizeBash('ls -la').hasSubshell).toBe(false);
  });
});

describe('tokenizeBash — parse errors', () => {
  it('returns ok:false on unbalanced quotes', () => {
    expect(tokenizeBash('echo "unterminated').ok).toBe(false);
    expect(tokenizeBash("echo 'open").ok).toBe(false);
  });
});

describe('isMutatingSegment', () => {
  it.each([
    [['rm', '-rf', 'x'], true],
    [['git', 'commit', '-m', 'x'], true],
    [['git', 'status'], false],
    [['composer', 'install'], true],
    [['composer', 'show'], false],
    [['cat', 'x', '>', 'y'], true],
    [['grep', 'x', 'file'], false],
  ])('%j → %s', (tokens, expected) => {
    expect(isMutatingSegment(tokens)).toBe(expected);
  });
});