/* Ember Mocha Adapter | (C) 2014 Teddy Zeenny | https://github.com/teddyzeenny/ember-mocha-adapter */

(function() {
  var done, doneTimeout, isAsync, emberBdd, isPromise;

  done = null;
  doneTimeout = null;
  isAsync = 0;

  Ember.Test.MochaAdapter = Ember.Test.Adapter.extend({
    init: function() {
      this._super();
      window.Mocha.interfaces['ember-bdd'] = emberBdd;
      window.mocha.ui('ember-bdd');
    },
    asyncStart: function() {
      isAsync++;
      clearTimeout(doneTimeout);
    },
    asyncEnd: function() {
      if (--isAsync === 0 && done && !isPromise) {
        doneTimeout = setTimeout(function() {
          complete();
        });
      }
    },
    exception: function(reason) {
      if (!(reason instanceof Error)) {
        reason = new Error(reason);
      }
      if (done) {
        complete(reason);
      } else {
        setTimeout(function() {
          throw reason;
        });
      }
    }
  });

  function fixAsync(suites, methodName) {
    return function(name, fn) {
      if (!fn) {
        fn = name;
        name = fn.name;
      }

      var suite = suites[0];
      var hook = suite[methodName];
      var asyncFn = fn;

      if (fn.length === 0) {
        asyncFn = function(d) {
          invoke(this, fn, d);
        };
      }

      if (hook.length === 2) {
        hook.call(suite, name, asyncFn);
      } else {
        hook.call(suite, asyncFn);
      }
    };
  }

  function invoke(context, fn, d) {
    done = d;
    isPromise = false;
    var result = fn.call(context);
    // If a promise is returned,
    // complete test when promise fulfills / rejects
    if (result && typeof result.then === 'function') {
      isPromise = true;
      result.then(function() { complete(); }, complete);
    } else {
       if (isAsync === 0) { complete(); }
    }
  }

  // Called whenever an async test passes or fails.
  // if `e` is passed, that means the test
  // failed with exception `e`
  function complete(e) {
    clearTimeout(doneTimeout);
    if (!done) { return; }
    var d = done;
    done = null;
    if (e) {
      // test failure
      if (!(e instanceof Error)) {
        e = new Error(e);
      }
      d(e);
    } else {
      // test passed
      d();
    }
  }

  /**
    ember-bdd mocha interface.
    This interface allows
    the Ember.js tester
    to forget about sync / async
    and treat all tests the same.

    This interface, along with the adapter
    will take care of handling sync vs async
  */

  emberBdd = function(suite) {
    var suites = [suite];

    suite.on('pre-require', function(context, file, mocha) {

      context.before = fixAsync(suites, 'beforeAll');

      context.after = fixAsync(suites, 'afterAll');

      context.beforeEach = fixAsync(suites, 'beforeEach');

      context.afterEach = fixAsync(suites, 'afterEach');


      context.it = context.specify = function(title, fn){
        var suite = suites[0], test;
        if (suite.pending) {
          fn = null;
        }
        if (!fn || fn.length === 1) {
          test = new Mocha.Test(title, fn);
        } else {
          var method = function(d) {
            invoke(this, fn, d);
          };
          method.toString = function() {
            return fn.toString();
          }
          test = new Mocha.Test(title, method);
        }
        suite.addTest(test);
        return test;
      };

      context.describe = context.context = function(title, fn){
        var suite = Mocha.Suite.create(suites[0], title);
        suites.unshift(suite);
        fn.call(suite);
        suites.shift();
        return suite;
      };

      context.xdescribe =
      context.xcontext =
      context.describe.skip = function(title, fn){
        var suite = Mocha.Suite.create(suites[0], title);
        suite.pending = true;
        suites.unshift(suite);
        fn.call(suite);
        suites.shift();
      };

      context.describe.only = function(title, fn){
        var suite = context.describe(title, fn);
        mocha.grep(suite.fullTitle());
      };


      context.it.only = function(title, fn){
        var test = context.it(title, fn);
        mocha.grep(test.fullTitle());
      };


      context.xit =
      context.xspecify =
      context.it.skip = function(title){
        context.it(title);
      };


    });

  };


}());

Ember.Test.adapter = Ember.Test.MochaAdapter.create();