'use strict';

describe('Scope', function() {
  var root = null, mockHandler = null;

  beforeEach(function() {
    root = createScope(angular.service, {
      '$exceptionHandler': $exceptionHandlerMockFactory()
    });
    mockHandler = root.$service('$exceptionHandler');
  });


  describe('$root', function() {
    it('should point to itself', function() {
      expect(root.$root).toEqual(root);
      expect(root.hasOwnProperty('$root')).toBeTruthy();
    });


    it('should not have $root on children, but should inherit', function() {
      var child = root.$new();
      expect(child.$root).toEqual(root);
      expect(child.hasOwnProperty('$root')).toBeFalsy();
    });

  });


  describe('$parent', function() {
    it('should point to itself in root', function() {
      expect(root.$root).toEqual(root);
    });


    it('should point to parent', function() {
      var child = root.$new();
      expect(root.$parent).toEqual(null);
      expect(child.$parent).toEqual(root);
      expect(child.$new().$parent).toEqual(child);
    });
  });


  describe('$id', function() {
    it('should have a unique id', function() {
      expect(root.$id < root.$new().$id).toBeTruthy();
    });
  });


  describe('this', function() {
    it('should have a \'this\'', function() {
      expect(root['this']).toEqual(root);
    });
  });


  describe('$new()', function() {
    it('should create a child scope', function() {
      var child = root.$new();
      root.a = 123;
      expect(child.a).toEqual(123);
    });


    it('should instantiate controller and bind functions', function() {
      function Cntl($browser, name){
        this.$browser = $browser;
        this.callCount = 0;
        this.name = name;
      }
      Cntl.$inject = ['$browser'];

      Cntl.prototype = {
        myFn: function() {
          expect(this).toEqual(cntl);
          this.callCount++;
        }
      };

      var cntl = root.$new(Cntl, ['misko']);

      expect(root.$browser).toBeUndefined();
      expect(root.myFn).toBeUndefined();

      expect(cntl.$browser).toBeDefined();
      expect(cntl.name).toEqual('misko');

      cntl.myFn();
      cntl.$new().myFn();
      expect(cntl.callCount).toEqual(2);
    });
  });


  describe('$service', function() {
    it('should have it on root', function() {
      expect(root.hasOwnProperty('$service')).toBeTruthy();
    });
  });


  describe('$watch/$digest', function() {
    it('should watch and fire on simple property change', function() {
      var spy = jasmine.createSpy();
      root.$watch('name', spy);
      root.$digest();
      spy.reset();

      expect(spy).not.wasCalled();
      root.$digest();
      expect(spy).not.wasCalled();
      root.name = 'misko';
      root.$digest();
      expect(spy).wasCalledWith(root, 'misko', undefined);
    });


    it('should watch and fire on expression change', function() {
      var spy = jasmine.createSpy();
      root.$watch('name.first', spy);
      root.$digest();
      spy.reset();

      root.name = {};
      expect(spy).not.wasCalled();
      root.$digest();
      expect(spy).not.wasCalled();
      root.name.first = 'misko';
      root.$digest();
      expect(spy).wasCalled();
    });

    it('should delegate exceptions', function() {
      root.$watch('a', function() {throw new Error('abc');});
      root.a = 1;
      root.$digest();
      expect(mockHandler.errors[0].message).toEqual('abc');
      $logMock.error.logs.length = 0;
    });


    it('should fire watches in order of addition', function() {
      // this is not an external guarantee, just our own sanity
      var log = '';
      root.$watch('a', function() { log += 'a'; });
      root.$watch('b', function() { log += 'b'; });
      root.$watch('c', function() { log += 'c'; });
      root.a = root.b = root.c = 1;
      root.$digest();
      expect(log).toEqual('abc');
    });


    it('should call child $watchers in addition order', function() {
      // this is not an external guarantee, just our own sanity
      var log = '';
      var childA = root.$new();
      var childB = root.$new();
      var childC = root.$new();
      childA.$watch('a', function() { log += 'a'; });
      childB.$watch('b', function() { log += 'b'; });
      childC.$watch('c', function() { log += 'c'; });
      childA.a = childB.b = childC.c = 1;
      root.$digest();
      expect(log).toEqual('abc');
    });


    it('should allow $digest on a child scope with and without a right sibling', function() {
      // tests a traversal edge case which we originally missed
      var log = '',
          childA = root.$new(),
          childB = root.$new();

      root.$watch(function() { log += 'r'; });
      childA.$watch(function() { log += 'a'; });
      childB.$watch(function() { log += 'b'; });

      // init
      root.$digest();
      expect(log).toBe('rabrab');

      log = '';
      childA.$digest();
      expect(log).toBe('a');

      log = '';
      childB.$digest();
      expect(log).toBe('b');
    });


    it('should repeat watch cycle while model changes are identified', function() {
      var log = '';
      root.$watch('c', function(self, v){self.d = v; log+='c'; });
      root.$watch('b', function(self, v){self.c = v; log+='b'; });
      root.$watch('a', function(self, v){self.b = v; log+='a'; });
      root.$digest();
      log = '';
      root.a = 1;
      root.$digest();
      expect(root.b).toEqual(1);
      expect(root.c).toEqual(1);
      expect(root.d).toEqual(1);
      expect(log).toEqual('abc');
    });


    it('should repeat watch cycle from the root elemnt', function() {
      var log = '';
      var child = root.$new();
      root.$watch(function() { log += 'a'; });
      child.$watch(function() { log += 'b'; });
      root.$digest();
      expect(log).toEqual('abab');
    });


    it('should prevent infinite recursion', function() {
      root.$watch('a', function(self, v){self.b++;});
      root.$watch('b', function(self, v){self.a++;});
      root.a = root.b = 0;

      expect(function() {
        root.$digest();
      }).toThrow('100 $digest() iterations reached. Aborting!');
    });


    it('should not fire upon $watch registration on initial $digest', function() {
      var log = '';
      root.a = 1;
      root.$watch('a', function() { log += 'a'; });
      root.$watch('b', function() { log += 'b'; });
      root.$digest();
      log = '';
      root.$digest();
      expect(log).toEqual('');
    });


    it('should watch objects', function() {
      var log = '';
      root.a = [];
      root.b = {};
      root.$watch('a', function(scope, value){
        log +='.';
        expect(value).toBe(root.a);
      });
      root.$watch('b', function(scope, value){
        log +='!';
        expect(value).toBe(root.b);
      });
      root.$digest();
      log = '';

      root.a.push({});
      root.b.name = '';

      root.$digest();
      expect(log).toEqual('.!');
    });


    it('should prevent recursion', function() {
      var callCount = 0;
      root.$watch('name', function() {
        expect(function() {
          root.$digest();
        }).toThrow('$digest already in progress');
        callCount++;
      });
      root.name = 'a';
      root.$digest();
      expect(callCount).toEqual(1);
    });


    it('should return a function that allows listeners to be unregistered', function() {
      var root = angular.scope(),
          listener = jasmine.createSpy('watch listener'),
          listenerRemove;

      listenerRemove = root.$watch('foo', listener);
      root.$digest(); //init
      expect(listener).toHaveBeenCalled();
      expect(listenerRemove).toBeDefined();

      listener.reset();
      root.foo = 'bar';
      root.$digest(); //triger
      expect(listener).toHaveBeenCalledOnce();

      listener.reset();
      root.foo = 'baz';
      listenerRemove();
      root.$digest(); //trigger
      expect(listener).not.toHaveBeenCalled();
    });
  });


  describe('$destroy', function() {
    var first = null, middle = null, last = null, log = null;

    beforeEach(function() {
      log = '';

      first = root.$new();
      middle = root.$new();
      last = root.$new();

      first.$watch(function() { log += '1';});
      middle.$watch(function() { log += '2';});
      last.$watch(function() { log += '3';});

      root.$digest();
      log = '';
    });


    it('should ignore remove on root', function() {
      root.$destroy();
      root.$digest();
      expect(log).toEqual('123');
    });


    it('should remove first', function() {
      first.$destroy();
      root.$digest();
      expect(log).toEqual('23');
    });


    it('should remove middle', function() {
      middle.$destroy();
      root.$digest();
      expect(log).toEqual('13');
    });


    it('should remove last', function() {
      last.$destroy();
      root.$digest();
      expect(log).toEqual('12');
    });

    it('should fire a $destroy event', function() {
      var destructedScopes = [];
      middle.$on('$destroy', function(event) {
        destructedScopes.push(event.currentScope);
      });
      middle.$destroy();
      expect(destructedScopes).toEqual([middle]);
    });

  });


  describe('$eval', function() {
    it('should eval an expression', function() {
      expect(root.$eval('a=1')).toEqual(1);
      expect(root.a).toEqual(1);

      root.$eval(function(self){self.b=2;});
      expect(root.b).toEqual(2);
    });
  });

  describe('$evalAsync', function() {

    it('should run callback before $watch', function() {
      var log = '';
      var child = root.$new();
      root.$evalAsync(function(scope){ log += 'parent.async;'; });
      root.$watch('value', function() { log += 'parent.$digest;'; });
      child.$evalAsync(function(scope){ log += 'child.async;'; });
      child.$watch('value', function() { log += 'child.$digest;'; });
      root.$digest();
      expect(log).toEqual('parent.async;parent.$digest;child.async;child.$digest;');
    });

    it('should cause a $digest rerun', function() {
      root.log = '';
      root.value = 0;
      root.$watch('value', 'log = log + ".";');
      root.$watch('init', function() {
        root.$evalAsync('value = 123; log = log + "=" ');
        expect(root.value).toEqual(0);
      });
      root.$digest();
      expect(root.log).toEqual('.=.');
    });

    it('should run async in the same order as added', function() {
      root.log = '';
      root.$evalAsync("log = log + 1");
      root.$evalAsync("log = log + 2");
      root.$digest();
      expect(root.log).toBe('12');
    });

  });


  describe('$apply', function() {
    it('should apply expression with full lifecycle', function() {
      var log = '';
      var child = root.$new();
      root.$watch('a', function(scope, a){ log += '1'; });
      child.$apply('$parent.a=0');
      expect(log).toEqual('1');
    });


    it('should catch exceptions', function() {
      var log = '';
      var child = root.$new();
      root.$watch('a', function(scope, a){ log += '1'; });
      root.a = 0;
      child.$apply(function() { throw new Error('MyError'); });
      expect(log).toEqual('1');
      expect(mockHandler.errors[0].message).toEqual('MyError');
      $logMock.error.logs.shift();
    });


    describe('exceptions', function() {
      var $exceptionHandler, log;
      beforeEach(function() {
        log = '';
        $exceptionHandler = jasmine.createSpy('$exceptionHandler');
        root.$service = function(name) {
          return {$exceptionHandler:$exceptionHandler}[name];
        };
        root.$watch(function() { log += '$digest;'; });
        root.$digest();
        log = '';
      });


      it('should execute and return value and update', function() {
        root.name = 'abc';
        expect(root.$apply(function(scope){
          return scope.name;
        })).toEqual('abc');
        expect(log).toEqual('$digest;');
        expect($exceptionHandler).not.wasCalled();
      });


      it('should catch exception and update', function() {
        var error = new Error('MyError');
        root.$apply(function() { throw error; });
        expect(log).toEqual('$digest;');
        expect($exceptionHandler).wasCalledWith(error);
      });
    });
  });


  describe('events', function() {

    describe('$on', function() {

      it('should add listener for both $emit and $broadcast events', function() {
        var log = '',
            root = angular.scope(),
            child = root.$new();

        function eventFn() {
          log += 'X';
        }

        child.$on('abc', eventFn);
        expect(log).toEqual('');

        child.$emit('abc');
        expect(log).toEqual('X');

        child.$broadcast('abc');
        expect(log).toEqual('XX');
      });


      it('should return a function that deregisters the listener', function() {
        var log = '',
            root = angular.scope(),
            child = root.$new(),
            listenerRemove;

        function eventFn() {
          log += 'X';
        }

        listenerRemove = child.$on('abc', eventFn);
        expect(log).toEqual('');
        expect(listenerRemove).toBeDefined();

        child.$emit('abc');
        child.$broadcast('abc');
        expect(log).toEqual('XX');

        log = '';
        listenerRemove();
        child.$emit('abc');
        child.$broadcast('abc');
        expect(log).toEqual('');
      });
    });


    describe('$emit', function() {
      var log, child, grandChild, greatGrandChild;

      function logger(event) {
        log += event.currentScope.id + '>';
      }

      beforeEach(function() {
        log = '';
        child = root.$new();
        grandChild = child.$new();
        greatGrandChild = grandChild.$new();

        root.id = 0;
        child.id = 1;
        grandChild.id = 2;
        greatGrandChild.id = 3;

        root.$on('myEvent', logger);
        child.$on('myEvent', logger);
        grandChild.$on('myEvent', logger);
        greatGrandChild.$on('myEvent', logger);
      });

      it('should bubble event up to the root scope', function() {
        grandChild.$emit('myEvent');
        expect(log).toEqual('2>1>0>');
      });


      it('should dispatch exceptions to the $exceptionHandler', function() {
        child.$on('myEvent', function() { throw 'bubbleException'; });
        grandChild.$emit('myEvent');
        expect(log).toEqual('2>1>0>');
        expect(mockHandler.errors).toEqual(['bubbleException']);
      });


      it('should allow cancelation of event propagation', function() {
        child.$on('myEvent', function(event){ event.cancel(); });
        grandChild.$emit('myEvent');
        expect(log).toEqual('2>1>');
      });


      it('should forward method arguments', function() {
        child.$on('abc', function(event, arg1, arg2){
          expect(event.name).toBe('abc');
          expect(arg1).toBe('arg1');
          expect(arg2).toBe('arg2');
        });
        child.$emit('abc', 'arg1', 'arg2');
      });

      describe('event object', function() {
        it('should have methods/properties', function() {
          var event;
          child.$on('myEvent', function(e){
            expect(e.targetScope).toBe(grandChild);
            expect(e.currentScope).toBe(child);
            expect(e.name).toBe('myEvent');
            event = e;
          });
          grandChild.$emit('myEvent');
          expect(event).toBeDefined();
        });
      });
    });


    describe('$broadcast', function() {
      describe('event propagation', function() {
        var log, child1, child2, child3, grandChild11, grandChild21, grandChild22, grandChild23,
            greatGrandChild211;

        function logger(event) {
          log += event.currentScope.id + '>';
        }

        beforeEach(function() {
          log = '';
          child1 = root.$new();
          child2 = root.$new();
          child3 = root.$new();
          grandChild11 = child1.$new();
          grandChild21 = child2.$new();
          grandChild22 = child2.$new();
          grandChild23 = child2.$new();
          greatGrandChild211 = grandChild21.$new();

          root.id = 0;
          child1.id = 1;
          child2.id = 2;
          child3.id = 3;
          grandChild11.id = 11;
          grandChild21.id = 21;
          grandChild22.id = 22;
          grandChild23.id = 23;
          greatGrandChild211.id = 211;

          root.$on('myEvent', logger);
          child1.$on('myEvent', logger);
          child2.$on('myEvent', logger);
          child3.$on('myEvent', logger);
          grandChild11.$on('myEvent', logger);
          grandChild21.$on('myEvent', logger);
          grandChild22.$on('myEvent', logger);
          grandChild23.$on('myEvent', logger);
          greatGrandChild211.$on('myEvent', logger);

          //          R
          //       /  |   \
          //     1    2    3
          //    /   / | \
          //   11  21 22 23
          //       |
          //      211
        });


        it('should broadcast an event from the root scope', function() {
          root.$broadcast('myEvent');
          expect(log).toBe('0>1>11>2>21>211>22>23>3>');
        });


        it('should broadcast an event from a child scope', function() {
          child2.$broadcast('myEvent');
          expect(log).toBe('2>21>211>22>23>');
        });


        it('should broadcast an event from a leaf scope with a sibling', function() {
          grandChild22.$broadcast('myEvent');
          expect(log).toBe('22>');
        });


        it('should broadcast an event from a leaf scope without a sibling', function() {
          grandChild23.$broadcast('myEvent');
          expect(log).toBe('23>');
        });


        it('should not not fire any listeners for other events', function() {
          root.$broadcast('fooEvent');
          expect(log).toBe('');
        });
      });


      describe('listener', function() {
        it('should receive event object', function() {
          var scope = angular.scope(),
              child = scope.$new(),
              event;

          child.$on('fooEvent', function(e) {
            event = e;
          });
          scope.$broadcast('fooEvent');

          expect(event.name).toBe('fooEvent');
          expect(event.targetScope).toBe(scope);
          expect(event.currentScope).toBe(child);
        });


        it('should support passing messages as varargs', function() {
          var scope = angular.scope(),
              child = scope.$new(),
              args;

          child.$on('fooEvent', function() {
            args = arguments;
          });
          scope.$broadcast('fooEvent', 'do', 're', 'me', 'fa');

          expect(args.length).toBe(5);
          expect(sliceArgs(args, 1)).toEqual(['do', 're', 'me', 'fa']);
        });
      });
    });
  });
});
