define(["Filer", "util"], function(Filer, util) {

  // PhantomJS doesn't like how the zlib stuff works, see:
  // https://github.com/imaya/zlib.js/issues/33
  function itShouldWorkInPhantomJSButDoesNot(test, callback) {
    if(navigator.userAgent.indexOf('PhantomJS') > -1) {
      return it.skip(test, callback);
    }
    it(test, callback);
  }

  describe('FileSystemShell.zip() and unzip()', function() {
    beforeEach(util.setup);
    afterEach(util.cleanup);

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

    it('should fail when path argument is absent', function(done) {
      var fs = util.fs();
      var shell = fs.Shell();

      shell.unzip(null, function(err) {
        expect(err).to.exist;
        done();
      });
    });

    itShouldWorkInPhantomJSButDoesNot('should download and unzip the contents of a zip file', function(done) {
      var fs = util.fs();
      var shell = fs.Shell();
      var url = "test-file.txt.zip";
      var contents = "This is a test file used in some of the tests.\n";

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

        shell.wget(url, {filename: url}, function(err, path) {
          if(err) throw err;

          shell.unzip(path, function(err) {
            if(err) throw err;

            fs.readFile('/original', function(err, originalData) {
              if(err) throw err;


              fs.readFile('/test-file.txt', function(err, data) {
                if(err) throw err;
                expect(util.typedArrayEqual(data, originalData)).to.be.true;
                done();
              });
            });
          });
        });
      });
    });

    itShouldWorkInPhantomJSButDoesNot('should download and unzip the contents of a zip file with a specified destination', function(done) {
      var fs = util.fs();
      var shell = fs.Shell();
      var Path = Filer.Path;
      var url = "test-file.txt.zip";
      var contents = "This is a test file used in some of the tests.\n";

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

        shell.wget(url, {filename: url}, function(err, path) {
          if(err) throw err;

          shell.tempDir(function(err, tmp) {
            if (err) throw err;

            shell.unzip(path, { destination: tmp }, function(err) {
              if(err) throw err;

              fs.readFile('/original', function(err, originalData) {
                if(err) throw err;

                fs.readFile(Path.join(tmp, 'test-file.txt'), function(err, data) {
                  if(err) throw err;
                  expect(util.typedArrayEqual(data, originalData)).to.be.true;
                  done();
                });
              });
            });
          });
        });
      });
    });

    itShouldWorkInPhantomJSButDoesNot('should be able to zip and unzip a file', function(done) {
      var fs = util.fs();
      var file = '/test-file.txt';
      var zipfile = file + '.zip';
      var shell = fs.Shell();
      var Path = Filer.Path;
      var contents = "This is a test file used in some of the tests.\n";

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

        shell.zip(zipfile, file, function(err) {
          if(err) throw err;

          fs.stat(zipfile, function(err, stats) {
            if(err) throw err;
            expect(stats.isFile()).to.be.true;

            shell.rm(file, function(err) {
              if(err) throw err;

              shell.unzip(zipfile, function(err) {
                if(err) throw err;

                fs.stat(file, function(err, stats) {
                  if(err) throw err;
                  expect(stats.isFile()).to.be.true;

                  fs.readFile(Path.join('/', file), 'utf8', function(err, data) {
                    if(err) throw err;
                    expect(data).to.equal(contents);
                    done();
                  });
                });
              });
            });
          });
        });
      });
    });

    itShouldWorkInPhantomJSButDoesNot('should be able to handle a deep tree structure in a zip', function(done) {
      // test-dir.zip has the following structure:
      //
      // test-dir/
      // ├── test-dir2
      // │   └── test-file.txt
      // ├── test-file.txt
      // └── test-file2.txt

      var fs = util.fs();
      var shell = fs.Shell();
      var url = "test-dir.zip";
      var Path = Filer.Path;
      var contents = "This is a test file used in some of the tests.\n";

      function confirmFile(filename, callback) {
        filename = Path.join('/', filename);
        fs.readFile(filename, 'utf8', function(err, data) {
          if(err) {
            console.error('Expected ' + filename + ' to exist.');
            expect(false).to.be.true;
            return callback(err);
          }
          expect(data).to.equal(contents);
          callback();
        });
      }

      function confirmDir(dirname, callback) {
        dirname = Path.join('/', dirname);
        fs.stat(dirname, function(err, stats) {
          if(err) {
            console.error('Expected ' + dirname + ' to exist.');
            expect(false).to.be.true;
            return callback(err);
          }
          expect(stats.isDirectory()).to.be.true;
          callback();
        });
      }

      shell.wget(url, {filename: url}, function(err, path) {
        if(err) throw err;

        shell.unzip(path, function(err) {
          if(err) throw err;

          // Forgive the crazy indenting, trying to match tree structure ;)
          confirmDir('test-dir', function() {
            confirmDir('test-dir/test-dir2', function() {
              confirmFile('test-dir/test-dir2/test-file.txt', function() {
            confirmFile('test-dir/test-file.txt', function() {
            confirmFile('test-dir/test-file2.txt', function() {
              done();
          });});});});});

        });
      });
    });

    itShouldWorkInPhantomJSButDoesNot('should be able to re-create (unzip/zip) a deep tree structure in a zip', function(done) {
      // test-dir.zip has the following structure:
      //
      // test-dir/
      // ├── test-dir2
      // │   └── test-file.txt
      // ├── test-file.txt
      // └── test-file2.txt

      var fs = util.fs();
      var shell = fs.Shell();
      var url = "test-dir.zip";
      var Path = Filer.Path;
      var contents = "This is a test file used in some of the tests.\n";

      function confirmFile(filename, callback) {
        filename = Path.join('/unzipped', filename);
        fs.readFile(filename, 'utf8', function(err, data) {
          if(err) {
            console.error('Expected ' + filename + ' to exist.');
            expect(false).to.be.true;
            return callback(err);
          }
          expect(data).to.equal(contents);
          callback();
        });
      }

      function confirmDir(dirname, callback) {
        dirname = Path.join('/unzipped', dirname);
        fs.stat(dirname, function(err, stats) {
          if(err) {
            console.error('Expected ' + dirname + ' to exist.');
            expect(false).to.be.true;
            return callback(err);
          }
          expect(stats.isDirectory()).to.be.true;
          callback();
        });
      }

      shell.wget(url, {filename: url}, function(err, path) {
        if(err) throw err;

        shell.unzip(path, function(err) {
          if(err) throw err;

          shell.zip('/test-dir2.zip', '/test-dir', { recursive: true }, function(err) {
            if(err) throw err;

            shell.mkdirp('/unzipped', function(err) {
              if(err) throw err;

              shell.unzip('/test-dir2.zip', { destination: '/unzipped' }, function(err) {
                if(err) throw err;

                // Forgive the crazy indenting, trying to match tree structure ;)
                confirmDir('test-dir', function() {
                  confirmDir('test-dir/test-dir2', function() {
                    confirmFile('test-dir/test-dir2/test-file.txt', function() {
                  confirmFile('test-dir/test-file.txt', function() {
                  confirmFile('test-dir/test-file2.txt', function() {
                    done();
                });});});});});

              });
            });
          });
        });
      });
    });

    itShouldWorkInPhantomJSButDoesNot('should fail if the zipfile already exists', function(done) {
      var fs = util.fs();
      var shell = fs.Shell();
      var file = "/file";
      var zipfile = "/zipfile.zip";
      var contents = "This is a test file used in some of the tests.\n";

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

        shell.zip(zipfile, file, function(err) {
          if(err) throw err;
          shell.zip(zipfile, file, function(err) {
            expect(err).to.exist;
            expect(err.code).to.equal('EEXIST');
            done();
          });
        });
      });
    });

  });
});