import {of as observableOf, Observable} from 'rxjs';

import {catchError, map} from 'rxjs/operators';
import {Injectable} from '@angular/core';
import {HttpClient, HttpErrorResponse} from '@angular/common/http';




import {CookieService} from 'ngx-cookie-service';
import {MatTableDataSource} from '@angular/material';

import {SnackBarService} from './snackbar.service';
import {StompConfig, StompRService} from '@stomp/ng2-stompjs';
import {Message} from '@stomp/stompjs';

import {environment} from '../environments/environment';
import {IdP, User, Service, AuthInfo, AllAuthInfo, UserState, SSHKey, NewSSHKey} from './types/types.module';


@Injectable()
export class UserService {
  public loggedIn = false;
  public user: User;
  public sshKeyData: MatTableDataSource<any>;
  public userInfoData: MatTableDataSource<any>;
  public services: Service[];
  public messages: string[];


  constructor(
    public cookieService: CookieService,
    public http: HttpClient,
    public snackBar: SnackBarService,
    private _stompService: StompRService,
  ) {
    this.update();
    this.messages = [];
  }

  public setIdPPreference(idp: IdP) {
    this.cookieService.set(environment.idpCookieName, String(idp.id));
  }

  public errorHandler(error: any): void {
    if (error.status === 500) {
      this.snackBar.open('Server Error');
    }
  }

  public getIdPPreference(): Observable<AllAuthInfo> {
    let idpID = Number(this.cookieService.get(environment.idpCookieName));

    return this.http.get('/backend/auth/v1/info/').pipe(map(
      (authInfo: AuthInfo) => {
        let selected = authInfo.idps[1];

        if (!idpID) {
          idpID = authInfo.default;
        }
        for (const idp of authInfo.idps) {
          if (idp.id === idpID) {
            selected = idp;
          }
        }
        return {
          idps: authInfo.idps,
          selected: selected,
        };
      }
    ),catchError(
      (error: any) => {
        this.errorHandler(error);
        return observableOf(null);
      }
    ),);
  }

  private _updateUserValues(newUser: any) {
    this.user = newUser;
    if (this.user) {
      // build sshKeyData
      if ('ssh_keys' in this.user) {
        this.sshKeyData = new MatTableDataSource(this.user.ssh_keys);
      } else {
        this.sshKeyData = undefined;
      }

      // build userInfoData
      const userInfoList = [];
      for (const key in this.user.userinfo) {
        if (this.user.userinfo.hasOwnProperty(key)) {
          userInfoList.push({name: key, info: this.user.userinfo[key]});
        }
      }
      this.userInfoData = new MatTableDataSource(userInfoList);

    } else {
      this.sshKeyData = undefined;
      this.userInfoData = undefined;
    }
  }

  public updateData(newData: any) {
    // did a login occur?
    let login = (!this.loggedIn && newData.logged_in);
    // did a logout occur?
    let logout = (this.loggedIn && !newData.logged_in);

    // report an occured error
    if (newData.error) {
      this.snackBar.open(newData.error);
    }

    // -- Value updating --
    this.loggedIn = newData.logged_in;
    // this check is needed because the accordeon collapses if we overwrite the list
    if (!this.services) {
      this.services = newData.services;
    }
    this._updateUserValues(newData.user);

    if (login) {
      this.snackBar.open('Logged in');
      this.connectLiveUpdates()
    }
    if (logout) {
      this.snackBar.open('Logged out');
      this._stompService.disconnect();

      // reset some attributes
      this.services = [];
    }
  }

  public updateState() {
    this.http
      .get('/backend/api/state/')
      .subscribe(
        (data: UserState) => {
          this.updateData(data);
        },
        (err: HttpErrorResponse) => {
          console.log('Error', err);
          this.snackBar.open('Error receiving data from the server');
        }
      );
  }

  public update() {
    this.updateState();
  }

  private initStomp() {
    // handle with care
    let login = this.user.id
    let passcode = this.cookieService.get('sessionid');

    const stompConfig: StompConfig = {
      // Which server?
      url: 'wss://hdf-portal.data.kit.edu/ws',

      // Headers
      // Typical keys: login, passcode, host
      headers: {
        login: 'webpage-client:' + login,
        passcode: passcode,
      },

      // How often to heartbeat?
      // Interval in milliseconds, set to 0 to disable
      heartbeat_in: 0, // Typical value 0 - disabled
      heartbeat_out: 20000, // Typical value 20000 - every 20 seconds
      // Wait in milliseconds before attempting auto reconnect
      // Set to 0 to disable
      // Typical value 5000 (5 seconds)
      reconnect_delay: 5000,

      // Will log diagnostics on console
      debug: false,
    };
    this._stompService.config = stompConfig;
    this._stompService.initAndConnect();
  }

  private connectLiveUpdates() {
    this.initStomp();
    let subscription = this._stompService.subscribe(
      '/exchange/update/' + this.user.id.toString()
    );

    subscription.pipe(map((message: Message) => {
      return message.body;
    })).subscribe((body: any) => {
      let json = JSON.parse(body);
      if (json.message && json.message != '') {
        this.snackBar.open(json.message);
        this.messages.push(json.message);
      }
      if (json.user_state) {
        this._updateUserValues(json.user_state);
      }
    });
  }

  public login(idp: IdP) {
    this.setIdPPreference(idp);
    window.location.href = 'https://hdf-portal.data.kit.edu/backend/auth/v1/request/';
  }

  public logout() {
    this.http.post('/backend/auth/v1/logout/', {}).subscribe(
      data => {
        this.updateData(data);
      }
    );
  }

  public addSshKey(key: NewSSHKey) {
    const body = {
      'type': 'add',
      'key': key,
    };
    return this.http.post('/backend/api/sshkey/', body).subscribe(
      data => {
        this.updateData(data);
      },
      (err) => {
        this.snackBar.open('Error uploading key');
        console.log(err);
        this.update();
      }
    );
  }

  public removeSshKey(key: SSHKey) {
    const body = {
      'type': 'remove',
      'id': key.id,
    };
    return this.http.post('/backend/api/sshkey/', body).subscribe(
      (data) => {
        this.updateData(data);
      },
      (err) => {
        this.snackBar.open('Error deleting key');
        console.log(err);
        this.update();
      }
    );
  }

  public addDeployment(service: Service, key: SSHKey) {
    const body = {
      'type': 'add',
      'key': key.id,
      'service': service.id,
    };
    return this.http.post('/backend/api/deployments/', body).subscribe(
      (data) => {
        //this.snackBar.open('Deployed key ' + key.name);
        this.updateData(data);
      },
      (err) => {
        this.snackBar.open('Error deploying key ' + key.name);
        console.log(err);
        this.update();
      }
    );
  }

  public removeDeployment(service: Service, key: SSHKey) {
    const body = {
      'type': 'remove',
      'key': key.id,
      'service':  service.id,
    };

    return this.http.post('/backend/api/deployments/', body).subscribe(
      (data) => {
        //this.snackBar.open('Withdrew key ' + key.name);
        this.updateData(data);
      },
      (err) => {
        this.snackBar.open('Error withdrawing key ' + key.name);
        console.log(err);
        this.update();
      }
    );
  }

  public deleteUser() {
    return this.http.delete('/backend/api/delete_user/').subscribe(
      (data) => {
        this.snackBar.open('Deleted user from server');
        this.updateData(data);
      },
      (err) => {
        this.snackBar.open('Error deleting user from server');
        console.log(err);
        this.update();
      }
    );
  }

  public taskInProgress(site, service): boolean {
    if (site && service) {

      for (const item of this.user.deployment_task_items){
        if (item.site.id == site.id && item.service.id == service.id) {
          return true;
        }
      }
    }
    return false;
  }
}