/**
 * Public Test Library for unit testing Angular2 Applications. Uses the
 * Jasmine framework.
 */
import {global} from 'angular2/src/core/facade/lang';

import {bind} from 'angular2/src/core/di';

import {createTestInjector, FunctionWithParamTokens, inject, injectAsync} from './test_injector';

export {inject, injectAsync} from './test_injector';

export {expect, NgMatchers} from './matchers';

var _global: jasmine.GlobalPolluter = <any>(typeof window === 'undefined' ? global : window);

export var afterEach: Function = _global.afterEach;
export var describe: Function = _global.describe;
export var ddescribe: Function = _global.fdescribe;
export var fdescribe: Function = _global.fdescribe;
export var xdescribe: Function = _global.xdescribe;

export type SyncTestFn = () => void;
export type AsyncTestFn = (done: () => void) => void;
export type AnyTestFn = SyncTestFn | AsyncTestFn;

var jsmBeforeEach = _global.beforeEach;
var jsmIt = _global.it;
var jsmIIt = _global.fit;
var jsmXIt = _global.xit;

var testProviders;
var injector;

// Reset the test providers before each test.
jsmBeforeEach(() => {
  testProviders = [];
  injector = null;
});

/**
 * Allows overriding default providers of the test injector,
 * defined in test_injector.js.
 *
 * The given function must return a list of DI providers.
 *
 * Example:
 *
 *   beforeEachProviders(() => [
 *     bind(Compiler).toClass(MockCompiler),
 *     bind(SomeToken).toValue(myValue),
 *   ]);
 */
export function beforeEachProviders(fn): void {
  jsmBeforeEach(() => {
    var providers = fn();
    if (!providers) return;
    testProviders = [...testProviders, ...providers];
    if (injector !== null) {
      throw new Error('beforeEachProviders was called after the injector had ' +
                      'been used in a beforeEach or it block. This invalidates the ' +
                      'test injector');
    }
  });
}

function _isPromiseLike(input): boolean {
  return input && !!(input.then);
}

function _it(jsmFn: Function, name: string, testFn: FunctionWithParamTokens | AnyTestFn,
             testTimeOut: number): void {
  var timeOut = testTimeOut;

  if (testFn instanceof FunctionWithParamTokens) {
    // The test case uses inject(). ie `it('test', inject([ClassA], (a) => { ...
    // }));`
    if (testFn.isAsync) {
      jsmFn(name, (done) => {
        if (!injector) {
          injector = createTestInjector(testProviders);
        }
        var returned = testFn.execute(injector);
        if (_isPromiseLike(returned)) {
          returned.then(done, done.fail);
        } else {
          done.fail('Error: injectAsync was expected to return a promise, but the ' +
                    ' returned value was: ' + returned);
        }
      }, timeOut);
    } else {
      jsmFn(name, () => {
        if (!injector) {
          injector = createTestInjector(testProviders);
        }
        var returned = testFn.execute(injector);
        if (_isPromiseLike(returned)) {
          throw new Error('inject returned a promise. Did you mean to use injectAsync?');
        };
      });
    }
  } else {
    // The test case doesn't use inject(). ie `it('test', (done) => { ... }));`
    jsmFn(name, testFn, timeOut);
  }
}


export function beforeEach(fn: FunctionWithParamTokens | AnyTestFn): void {
  if (fn instanceof FunctionWithParamTokens) {
    // The test case uses inject(). ie `beforeEach(inject([ClassA], (a) => { ...
    // }));`
    if (fn.isAsync) {
      jsmBeforeEach((done) => {
        if (!injector) {
          injector = createTestInjector(testProviders);
        }
        var returned = fn.execute(injector);
        if (_isPromiseLike(returned)) {
          returned.then(done, done.fail);
        } else {
          done.fail('Error: injectAsync was expected to return a promise, but the ' +
                    ' returned value was: ' + returned);
        }
      });
    } else {
      jsmBeforeEach(() => {
        if (!injector) {
          injector = createTestInjector(testProviders);
        }
        var returned = fn.execute(injector);
        if (_isPromiseLike(returned)) {
          throw new Error('inject returned a promise. Did you mean to use injectAsync?');
        };
      });
    }
  } else {
    // The test case doesn't use inject(). ie `beforeEach((done) => { ... }));`
    if ((<any>fn).length === 0) {
      jsmBeforeEach(() => { (<SyncTestFn>fn)(); });
    } else {
      jsmBeforeEach((done) => { (<AsyncTestFn>fn)(done); });
    }
  }
}

export function it(name: string, fn: FunctionWithParamTokens | AnyTestFn,
                   timeOut: number = null): void {
  return _it(jsmIt, name, fn, timeOut);
}

export function xit(name: string, fn: FunctionWithParamTokens | AnyTestFn,
                    timeOut: number = null): void {
  return _it(jsmXIt, name, fn, timeOut);
}

export function iit(name: string, fn: FunctionWithParamTokens | AnyTestFn,
                    timeOut: number = null): void {
  return _it(jsmIIt, name, fn, timeOut);
}

export function fit(name: string, fn: FunctionWithParamTokens | AnyTestFn,
                    timeOut: number = null): void {
  return _it(jsmIIt, name, fn, timeOut);
}