/*--------------------------------------------------------------------------------------------------------------
 *  Copyright (c) insite-gmbh. All rights reserved.
 *  Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------------------------*/
import { Injectable, Inject } from '@angular/core';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { IUserAuthStateService } from '../interfaces/IUserAuthStateService.interface';
import { IUserAuthenticationService, IUSERAUTHENTICATIONSERVICE_TOKEN } from '../interfaces/IUserAuthenticationService.interface';
import { AuthAction } from '../interfaces/AuthAction';
import { Subject } from 'rxjs/Subject';
import { Observable } from 'rxjs/Observable';

@Injectable()
export class UserAuthStateService implements IUserAuthStateService {

    private _actionRequest: Subject<AuthAction>;
    public username: string = "";
    public level: string = "";

    constructor(@Inject(IUSERAUTHENTICATIONSERVICE_TOKEN) private _userAuthenticationService: IUserAuthenticationService) {
        this._actionRequest = new Subject<AuthAction>();
        this.level = this._userAuthenticationService.InvalidUserLevel;
    }

    login(loginResult: (username: string, level: string, success: boolean) => void): void {
        return this.doLogin(this._userAuthenticationService.InvalidUserLevel, loginResult);
    }

    logout(): void {
        console.log("User " + this.username + " logged out.");
        this.username = "";
        this.level = this._userAuthenticationService.InvalidUserLevel;
    }

    checkRequestedLevel(levelRequested: string, loginResult: (username: string, level: string, success: boolean) => void): void {
        if (this._userAuthenticationService.isSufficientLevel(this.level, levelRequested)) {
            loginResult(this.username, this.level, true);
        } else {
            this.doLogin(levelRequested, loginResult);
        }
    }

    private doLogin(levelRequested: string, loginResult: (username: string, level: string, success: boolean) => void): void {
        this._actionRequest.next(new AuthAction("login", this._userAuthenticationService, 
            (username: string, level: string, success: boolean) => {
                if (success && (levelRequested === this._userAuthenticationService.InvalidUserLevel 
                                || this._userAuthenticationService.isSufficientLevel(level, levelRequested))) {
                    this.username = username;
                    this.level = level;
                }
                else {
                    success = false;
                }
                loginResult(this.username, this.level, success);
        }));
    }

    actionRequest(): Subject<AuthAction> {
        return this._actionRequest;
    }
}