import { Injectable } from '@angular/core';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/of';

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

import { SnackBarService } from './snackbar.service';

interface Group {
  name: string;
}

interface SSHKey {
  name: string;
  key: string;
}

interface Service {
  name: string;
}

interface Deployment {
  service: Service;
  ssh_keys: SSHKey[];
}

interface User {
  sub: string;
  email: string;
  username: string;
  groups: Group[];
  ssh_keys: SSHKey[];
  deployments: Deployment[];
}

interface State {
  services: Service[];
}

interface StateAPI {
  state: State;
  logged_in: boolean;
}

interface StateAPIUser {
  state: State;
  logged_in: boolean;
  user: User;
}


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


  constructor(
    public cookieService: CookieService,
    public http: HttpClient,
    public snackBar: SnackBarService,
  ) {
    this.update();
  }

  public logState() {
    console.log(
      this.state,
    );
    console.log(
      this.user,
    );
  }

  public backendOperational(): Observable<boolean> {
    return this.http.get('/backend/api/operational').map(
      (data) => {
        return data['operational'];
      },
      (err) => {
        return false;
      }
    );
  }

  public login() {
    this.backendOperational().subscribe(
      (operational: boolean) => {
        console.log(operational);
        if (operational) {
          window.location.href = 'https://hdf-portal.data.kit.edu/backend/auth';
        } else {
          this.snackBar.open('The backend is currently not operational');
        }
      }
    );
  }

  public updateData(data: any) {
    if (!this.loggedIn && data.logged_in) {
      this.snackBar.open('Logged in');
    }

    this.loggedIn = data.logged_in;
    if (!this.state) {
      this.state = data.state;
    }
    this.user = data.user;


    if (this.user) {
      // build sshKeyData
      if ('ssh_keys' in this.user) {
        this.sshKeyData = new MatTableDataSource(this.user.ssh_keys);
      } else {
        this.sshKeyData = null;
      }

      // build userInfoData
      const userInfoList = [];
      for (const key of ['sub', 'email']) {
        userInfoList.push({name: key, info: this.user[key]});
      }
      this.userInfoData = new MatTableDataSource(userInfoList);

    } else {
      this.sshKeyData = null;
      this.userInfoData = null;
    }
    this.logState();
  }

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

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

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

  public removeDeployment(serviceName: string, keyName: string) {
    const body = {
      'type': 'remove',
      'key': keyName,
      'service': serviceName,
    };
    return this.http.post('/backend/api/deployments/', body).subscribe(
      (data) => {
        this.snackBar.open('Withdrew key ' + keyName);
        this.updateData(data);
      },
      (err) => {
        this.snackBar.open('Error withdrawing key ' + keyName);
        console.log(err);
        this.update();
      }
    );
  }
}