import { NgModule, ModuleWithProviders } from '@angular/core';
import { DynamicAnimationsService } from './dynamic-animations.service';
import { StateCssMapperService } from './state-css-mapper/state-css-mapper.service';
import { AnimationStatesService } from './animation-states/animation-states.service';
import { DynamicAnimationsHandlerConstructor } from './dynamic-animations-handler/dynamic-animations-handler.constructor';
import { DefaultDynamicAnimationsHandlerService } from './default-dynamic-animations-handler/default-dynamic-animations-handler.service';
import { DynamicAnimationsHandlerConstructorToken } from './dynamic-animations-handler/dynamic-animations-handler.token';
import { AnimationStateMachineConstructorToken } from './animation-state-machine/animation-state-machine.token';
import { DefaultAnimationsStateMachine } from './default-animations-state-machine/default-animations-state-machine.service';
import { AnimationStateMachineConstructor } from './animation-state-machine/animation-state-machine.constructor';
import { DynamicAnimationsDirective } from './dynamic-animations.directive';
import { LeaveDirective } from './leave/leave.directive';
import { NgTransitionService } from './ng-transition/ng-transition.service';
import { NgStateService } from './ng-state/ng-state.service';

/**
 * The Dynamic Animations Module provides support for allowing Angular
 * Animations to be passed in at runtime dynamically instead of 
 * described statically in the Component's metadata.
 * 
 * This functionality is handled through the exported 
 * {@link DynamicAnimationsDirective}.
 * 
 * The forRoot method must be called to provide the {@link DynamicAnimationsHandler}
 * and the {@link AnimationStateMachine} that are used by the directive.
 * 
 * The implementations are handled by default by the {@link DefaultDynamicAnimationsHandlerService}
 * and the {@link DefaultAnimationsStateMachine} respectively but can be 
 * overriden with custom implementations if desired.
 */
@NgModule({
  providers: [
    DynamicAnimationsService,
    AnimationStatesService, 
    StateCssMapperService,
    NgTransitionService,
    NgStateService
  ],
  declarations: [DynamicAnimationsDirective, LeaveDirective],
  exports: [DynamicAnimationsDirective, LeaveDirective]
})
export class DynamicAnimationsModule {
  static forRoot(
    animationsHandlerConstructor: DynamicAnimationsHandlerConstructor = DefaultDynamicAnimationsHandlerService,
    animationsStateMachineConstructor: AnimationStateMachineConstructor = DefaultAnimationsStateMachine 
  ): ModuleWithProviders {
    return {
      ngModule: DynamicAnimationsModule,
      providers: [
        { 
          provide: DynamicAnimationsHandlerConstructorToken, 
          useValue: animationsHandlerConstructor 
        },
        {
          provide: AnimationStateMachineConstructorToken,
          useValue: animationsStateMachineConstructor
        }
      ]
    };
  }  
}