var util = require('../../lib/test-utils.js');
var expect = require('chai').expect;

describe('FileSystemShell.cd', function() {
  beforeEach(util.setup);
  afterEach(util.cleanup);

  it('should be a function', function() {
    var shell = util.shell();
    expect(shell.cd).to.be.a('function');
  });

  it('should default to a cwd of /', function() {
    var shell = util.shell();
    expect(shell.pwd()).to.equal('/');
  });

  it('should allow changing the path to a valid dir', function(done) {
    var fs = util.fs();
    var shell = new fs.Shell();

    fs.mkdir('/dir', function(err) {
      if(err) throw err;

      expect(shell.pwd()).to.equal('/');
      shell.cd('/dir', function(err) {
        expect(err).not.to.exist;
        expect(shell.pwd()).to.equal('/dir');
        done();
      });
    });
  });

  it('should fail when changing the path to an invalid dir', function(done) {
    var fs = util.fs();
    var shell = new fs.Shell();

    fs.mkdir('/dir', function(err) {
      if(err) throw err;

      expect(shell.pwd()).to.equal('/');
      shell.cd('/nodir', function(err) {
        expect(err).to.exist;
        expect(err.code).to.equal('ENOTDIR');
        expect(shell.pwd()).to.equal('/');
        done();
      });
    });
  });

  it('should fail when changing the path to a file', function(done) {
    var fs = util.fs();
    var shell = new fs.Shell();

    fs.writeFile('/file', 'file', function(err) {
      if(err) throw err;

      expect(shell.pwd()).to.equal('/');
      shell.cd('/file', function(err) {
        expect(err).to.exist;
        expect(err.code).to.equal('ENOTDIR');
        expect(shell.pwd()).to.equal('/');
        done();
      });
    });
  });

  it('should allow relative paths for a valid dir', function(done) {
    var fs = util.fs();
    var shell = new fs.Shell();

    fs.mkdir('/dir', function(err) {
      if(err) throw err;

      expect(shell.pwd()).to.equal('/');
      shell.cd('./dir', function(err) {
        expect(err).not.to.exist;
        expect(shell.pwd()).to.equal('/dir');
        done();
      });
    });
  });

  it('should allow .. in paths for a valid dir', function(done) {
    var fs = util.fs();
    var shell = new fs.Shell();

    fs.mkdir('/dir', function(err) {
      if(err) throw err;

      expect(shell.pwd()).to.equal('/');
      shell.cd('./dir', function(err) {
        expect(err).not.to.exist;
        expect(shell.pwd()).to.equal('/dir');
        shell.cd('..', function(err) {
          expect(err).not.to.exist;
          expect(shell.pwd()).to.equal('/');
          done();
        });
      });
    });
  });

  it('should follow symlinks to dirs', function(done) {
    var fs = util.fs();

    fs.mkdir('/dir', function(error) {
      if(error) throw error;

      fs.symlink('/dir', '/link', function(error) {
        if(error) throw error;

        var shell = new fs.Shell();
        shell.cd('link', function(error) {
          expect(error).not.to.exist;
          expect(shell.pwd()).to.equal('/link');
          done();
        });
      });
    });
  });
});