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';

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[];


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

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

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

    return this.http.get('/backend/auth/v1/info/').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,
        };
      }
    );
  }

  public updateData(data: any) {
    if (data['error']) {
      this.snackBar.open(data['error']);
    }

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

    this.loggedIn = data.logged_in;
    if (!this.services) {
      this.services = data.services;
    }
    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 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 = null;
      this.userInfoData = null;
    }
  }

  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();
  }

  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();
      }
    );
  }
}