library test_lib.test_lib;

import 'package:guinness/guinness.dart' as gns;
export 'package:guinness/guinness.dart' hide Expect, expect, NotExpect, beforeEach, it, iit, xit, SpyObject;
import 'package:unittest/unittest.dart' hide expect;

import 'dart:async';

import 'package:angular2/src/dom/dom_adapter.dart' show DOM;

import 'package:angular2/src/reflection/reflection.dart';
import 'package:angular2/src/reflection/reflection_capabilities.dart';

import 'package:angular2/src/di/binding.dart' show bind;
import 'package:angular2/src/di/injector.dart' show Injector;

import './test_injector.dart';
export './test_injector.dart' show inject;

bool IS_DARTIUM = true;

List _testBindings = [];
Injector _injector;
bool _isCurrentTestAsync;
bool _inIt = false;

class AsyncTestCompleter {
  Completer _completer;

  AsyncTestCompleter() {
    _completer = new Completer();
  }

  done() {
    _completer.complete();
  }

  get future => _completer.future;
}

testSetup() {
  reflector.reflectionCapabilities = new ReflectionCapabilities();
  // beforeEach configuration:
  // - Priority 3: clear the bindings before each test,
  // - Priority 2: collect the bindings before each test, see beforeEachBindings(),
  // - Priority 1: create the test injector to be used in beforeEach() and it()

  gns.beforeEach(
      () {
        _testBindings.clear();
      },
      priority: 3
  );

  var completerBinding = bind(AsyncTestCompleter).toFactory(() {
    // Mark the test as async when an AsyncTestCompleter is injected in an it(),
    if (!_inIt) throw 'AsyncTestCompleter can only be injected in an "it()"';
    _isCurrentTestAsync = true;
    return new AsyncTestCompleter();
  });

  gns.beforeEach(
      () {
        _isCurrentTestAsync = false;
        _testBindings.add(completerBinding);
        _injector = createTestInjector(_testBindings);
      },
      priority: 1
  );
}

Expect expect(actual, [matcher]) {
  final expect = new Expect(actual);
  if (matcher != null) expect.to(matcher);
  return expect;
}

class Expect extends gns.Expect {
  Expect(actual) : super(actual);

  NotExpect get not => new NotExpect(actual);

  void toEqual(expected) => toHaveSameProps(expected);
  void toThrowError([message=""]) => toThrowWith(message: message);
  void toBePromise() => _expect(actual is Future, equals(true));
  void toImplement(expected) => toBeA(expected);
  void toBeNaN() => _expect(double.NAN.compareTo(actual) == 0, equals(true));
  void toHaveText(expected) => _expect(elementText(actual), expected);
  Function get _expect => gns.guinness.matchers.expect;
}

class NotExpect extends gns.NotExpect {
  NotExpect(actual) : super(actual);

  void toEqual(expected) => toHaveSameProps(expected);
  void toBePromise() => _expect(actual is Future, equals(false));
  Function get _expect => gns.guinness.matchers.expect;
}

beforeEach(fn) {
  if (fn is! FunctionWithParamTokens) fn = new FunctionWithParamTokens([], fn);
  gns.beforeEach(() {
    fn.execute(_injector);
  });
}

/**
 * Allows overriding default bindings defined in test_injector.js.
 *
 * The given function must return a list of DI bindings.
 *
 * Example:
 *
 *   beforeEachBindings(() => [
 *     bind(Compiler).toClass(MockCompiler),
 *     bind(SomeToken).toValue(myValue),
 *   ]);
 */
beforeEachBindings(fn) {
  gns.beforeEach(
      () {
        var bindings = fn();
        if (bindings != null) _testBindings.addAll(bindings);
      },
      priority: 2
  );
}

_it(gnsFn, name, fn) {
  if (fn is! FunctionWithParamTokens) fn = new FunctionWithParamTokens([], fn);
  gnsFn(name, () {
    _inIt = true;
    fn.execute(_injector);
    _inIt = false;
    if (_isCurrentTestAsync) return _injector.get(AsyncTestCompleter).future;
  });
}


it(name, fn) {
  _it(gns.it, name, fn);
}

iit(name, fn) {
  _it(gns.iit, name, fn);
}

xit(name, fn) {
  _it(gns.xit, name, fn);
}

class SpyObject extends gns.SpyObject {
  // Need to take an optional type as this is required by
  // the JS SpyObject.
  SpyObject([type = null]) {
  }
}

String elementText(n) {
  hasNodes(n) {
    var children = DOM.childNodes(n);
    return children != null && children.length > 0;
  }

  if (n is Iterable) {
    return n.map((nn) => elementText(nn)).join("");
  }

  if (DOM.isCommentNode(n)) {
    return '';
  }

  if (DOM.isElementNode(n) && DOM.tagName(n) == 'CONTENT') {
    return elementText(DOM.getDistributedNodes(n));
  }

  if (DOM.hasShadowRoot(n)) {
    return elementText(DOM.childNodesAsList(DOM.getShadowRoot(n)));
  }

  if (hasNodes(n)) {
    return elementText(DOM.childNodesAsList(n));
  }

  return DOM.getText(n);
}