define(["Filer"], function(Filer) {
  
  describe("Filer.FileSystem.providers.Memory", function() {
    it("is supported -- if it isn't, none of these tests can run.", function() {
      expect(Filer.FileSystem.providers.Memory.isSupported()).toEqual(true);
    });

    it("has open, getReadOnlyContext, and getReadWriteContext instance methods", function() {
      var indexedDBProvider = new Filer.FileSystem.providers.Memory();
      expect(typeof indexedDBProvider.open).toEqual('function');
      expect(typeof indexedDBProvider.getReadOnlyContext).toEqual('function');
      expect(typeof indexedDBProvider.getReadWriteContext).toEqual('function');
    });

    describe("open an Memory provider", function() {
      it("should open a new Memory database", function() {
        var complete = false;
        var _error, _result;

        var provider = new Filer.FileSystem.providers.Memory(this.db_name);
        provider.open(function(err, firstAccess) {
          _error = err;
          _result = firstAccess;
          complete = true;
        });

        waitsFor(function() {
          return complete;
        }, 'test to complete', DEFAULT_TIMEOUT);

        runs(function() {
          expect(_error).toEqual(null);
          expect(_result).toEqual(true);
        });
      });
    });

    describe("Read/Write operations on an Memory provider", function() {
      it("should allow put() and get()", function() {
        var complete = false;
        var _error, _result;

        var provider = new Filer.FileSystem.providers.Memory(this.db_name);
        provider.open(function(err, firstAccess) {
          _error = err;

          var context = provider.getReadWriteContext();
          context.put("key", "value", function(err, result) {
            _error = _error || err;
            context.get("key", function(err, result) {
              _error = _error || err;
              _result = result;

              complete = true;
            });
          });
        });

        waitsFor(function() {
          return complete;
        }, 'test to complete', DEFAULT_TIMEOUT);

        runs(function() {
          expect(_error).toEqual(null);
          expect(_result).toEqual("value");
        });
      });

      it("should allow delete()", function() {
        var complete = false;
        var _error, _result;

        var provider = new Filer.FileSystem.providers.Memory(this.db_name);
        provider.open(function(err, firstAccess) {
          _error = err;

          var context = provider.getReadWriteContext();
          context.put("key", "value", function(err, result) {
            _error = _error || err;
            context.delete("key", function(err, result) {
              _error = _error || err;
              context.get("key", function(err, result) {
                _error = _error || err;
                _result = result;

                complete = true;
              });
            });
          });
        });

        waitsFor(function() {
          return complete;
        }, 'test to complete', DEFAULT_TIMEOUT);

        runs(function() {
          expect(_error).toEqual(null);
          expect(_result).toEqual(null);
        });
      });

      it("should allow clear()", function() {
        var complete = false;
        var _error, _result1, _result2;

        var provider = new Filer.FileSystem.providers.Memory(this.db_name);
        provider.open(function(err, firstAccess) {
          _error = err;

          var context = provider.getReadWriteContext();
          context.put("key1", "value1", function(err, result) {
            _error = _error || err;
            context.put("key2", "value2", function(err, result) {
              _error = _error || err;

              context.clear(function(err) {
                _error = _error || err;

                context.get("key1", function(err, result) {
                  _error = _error || err;
                  _result1 = result;

                  context.get("key2", function(err, result) {
                    _error = _error || err;
                    _result2 = result;

                    complete = true;
                  });
                });
              });
            });
          });
        });

        waitsFor(function() {
          return complete;
        }, 'test to complete', DEFAULT_TIMEOUT);

        runs(function() {
          expect(_error).toEqual(null);
          expect(_result1).toEqual(null);
          expect(_result2).toEqual(null);
        });
      });

      it("should fail when trying to write on ReadOnlyContext", function() {
        var complete = false;
        var _error, _result;

        var provider = new Filer.FileSystem.providers.Memory(this.db_name);
        provider.open(function(err, firstAccess) {
          _error = err;

          var context = provider.getReadOnlyContext();
          context.put("key1", "value1", function(err, result) {
            _error = _error || err;
            _result = result;

            complete = true;
          });
        });

        waitsFor(function() {
          return complete;
        }, 'test to complete', DEFAULT_TIMEOUT);

        runs(function() {
          expect(_error).toBeDefined();
          expect(_result).toEqual(null);
        });
      });
    });
  });

});