import { Injectable, EventEmitter } from '@angular/core';
import { HttpClientModule, HttpClient, HttpHeaders, HttpErrorResponse } from '@angular/common/http';
import { Observable, Subject, BehaviorSubject, of, from } from 'rxjs';
import { fromEvent, throwError, Subscription, merge } from 'rxjs';
import { catchError, map, tap, filter } from 'rxjs/operators';
import { Job } from './job';
import { AppAction, Strudelapp, StrudelappInstance } from './strudelapp';
import { Computesite, Health } from './computesite';
import { APIServer } from './apiserver';
import { Identity, AuthToken, KeyCert, SshAuthzServer } from './identity';
import { BatchInterface } from './batchinterface';
import { ComputesitesService } from './computesites.service';
import { StrudelappsService } from './strudelapps.service';
import { timer } from 'rxjs/observable/timer';
import { repeat, takeUntil } from 'rxjs/operators';
import { LocationStrategy, Location } from '@angular/common';
import { ActivatedRoute, Router } from '@angular/router';
import { ModaldialogComponent } from './modaldialog/modaldialog.component';
import { MatDialog, MatDialogRef, MAT_DIALOG_DATA, MatDialogModule } from '@angular/material';
import { AuthorisationService } from './authorisation.service';
import { environment } from '../environments/environment';
import { BackendSelectionService } from './backend-selection.service';

/** The TES service contains ways to start Tunnels, and Execute programs
Its also responsible for querying a compute site for running jobs */



@Injectable({
  providedIn: 'root',
})
export class TesService {
public Base: string;
//public Base=environment.tesurl;
//private twsproxy = environment.twsurl;
private twsproxy: string;
// public Base='http://localhost:5000';
public statusMsg: BehaviorSubject<any>;
public jobs: any[];
// public joblist: BehaviorSubject<{ [id: string ]: Job[]}>;
//public joblist: BehaviorSubject<Job[]>;
//public userhealth: BehaviorSubject<Health[]>;

private timerSubscription: any;
private appwindow: any;
public apiserver: BehaviorSubject<APIServer>;
public apiservers: BehaviorSubject<APIServer[]>;
private updateJobSub: Subscription;
private updateUserHealthSub: Subscription;
private cachetincidents: BehaviorSubject<Health[]>;
private nextUpdate: Subscription;
private cancelRequests$: Subject<boolean>;
public identitySubject: BehaviorSubject<Identity>;
public appSubject: BehaviorSubject<Strudelapp>;
private openapps: any[];

// public batchinterface: {[id: string] : BatchInterface};

  constructor(private http: HttpClient,
              public dialog: MatDialog,
              private computesitesService: ComputesitesService,
              private authorisationService: AuthorisationService,
              private strudelappsService: StrudelappsService,
              private backendSelectionService: BackendSelectionService,
              private location: Location ) {

    // this.joblist = new BehaviorSubject<{[id: string]: Job[]}>({});
    //this.joblist = new BehaviorSubject<Job[]>([]);
    //this.cachetincidents = new BehaviorSubject<Health[]>([]);
    //this.userhealth = new BehaviorSubject<Health[]>([{'stat':'ok','msg':''}])
    this.apiserver = new BehaviorSubject<APIServer>(null);
    this.apiservers = new BehaviorSubject<APIServer[]>([]);
    this.cancelRequests$ = new Subject<boolean>();
    this.openapps = [];
    //this.identitySubject = new BehaviorSubject<Identity>(null);
    //this.appSubject = new BehaviorSubject<Strudelapp>(null);

      this.backendSelectionService.apiserver.subscribe( (value) => { if (value != null) {this.twsproxy = value.tws ; this.Base = value.tes }});
    timer(500).pipe(repeat()).subscribe(() => this.checkWindows());
    // this.batchinterface = {};
    // this.computesitesService.identities.subscribe(identities => this.startPolling(identities));
 }

public checkWindows() {
  var app: any;
  this.openapps.forEach( (app,index) => {
    if (app.window.closed) {
      if (app.job.state == 'RUNNING') {
        let dialogRef = this.dialog.open(ModaldialogComponent, {
          width: '600px',
          data: app.job,
        });
        //dialogRef.afterClosed().subscribe((job) => {if (job !== null) { console.log('terminate'); console.log(job);}})
        dialogRef.afterClosed().subscribe((job) => {if (job !== null) { this.cancel(job)}});
      }
      this.openapps.splice(index,1);
    }
  })
}

public setStatusMsg(statusMsg: BehaviorSubject<any>) {
  this.statusMsg = statusMsg;
}

 private buildParams(app: Strudelapp, identity: Identity, batchinterface: BatchInterface, appinst?: any): string {
   let params = new URLSearchParams();
   let id = identity.copy_skip_catalog();
   id.site.appCatalog = null;

   if (appinst!== null)  {
     params.set('appinstance',JSON.stringify(appinst));
   }
   params.set('app',JSON.stringify(app));
   params.set('interface',JSON.stringify(batchinterface));
   params.set('identity',JSON.stringify(id));
   return params.toString();
 }


 updateJoblist(resp, identity: Identity) {
     // resp contains a javascript represnetiation of a list of jobs
     // We want to update the joblist BUT we don't want to create new Job objects
     // instead we want to reuse existing job objects removing any which are no longer valid
     // and adding any new ones. We also want the list sorted from largest jobid to smallest (oldest job)
     // The sort is lexographic since sometimes jobids are a string rather than a number
   
   var joblist: Job[] = []
   var jobquery: Job[] = <Job[]>resp;
   var lastjoblist: Job[] = identity.joblist.value;
   var qjobids: any[] = [];
   var jobids: any[] = [];
   var j: Job;
   var newjob: Job;
   var idx: number;

   for (j of jobquery) {
       qjobids.push(j.jobid);
   }
   for (j of lastjoblist) {
       if (qjobids.indexOf(j.jobid) != -1) {
           if (jobids.indexOf(j.jobid) == -1) {
               idx = qjobids.indexOf(j.jobid)
               newjob = jobquery[idx]
               // These values in the job may change, but we need to keep using the old object
               j.state  = newjob.state;
               j.endtime = newjob.endtime;
               j.batch_host = newjob.batch_host;
               joblist.push(j);
               jobids.push(j.jobid);
           }
       }
   }
   for (j of jobquery) {
       if (jobids.indexOf(j.jobid) == -1) {
           joblist.push(j);
           jobids.push(j.jobid);
       }
   }
       
   for (j of joblist) {
     if (j.app === undefined || j.app == null) {
       j.app = this.strudelappsService.getApp(j.appname,identity.site.appCatalog.value);
     }
     if (j.identity == undefined) {
        j.identity = identity;
     }
     if (j.connectionState == undefined) {
         j.connectionState = 0;
     }
   }
   joblist = joblist.sort((a,b) =>  (a.jobid < b.jobid)? 1:-1);
   identity.joblist.next(joblist);
   //this.statusMsg.next(null);
 }

 private getBatchInterfaceError(error: any) {
   console.error(error);
 }



 private getCachetIncidentsError(error: any, identity: Identity) {
   return this.getJobsError(error, identity)
 }

 
 public cancelHealthRequests() {
    this.cancelRequests$.next(true);
 }

 private getUserHealthError(error: any, identity: Identity) {
   identity.accountalerts.next([]);
   this.statusMsg.next("There was an error checking your user account");
   //return this.getJobsError(error,identity)
 }

 private getJobsError(error: any, identity: Identity) {
   identity.joblist.next([]);
   if (error.status == 0) {
     this.statusMsg.next("A network error occurred. Please try again later");
     return
   }
   console.error(error);
   if (error.status == 401) {
     this.statusMsg.next("Login expired. Please log in again.");
     this.authorisationService.updateAgentContents();
     return
   }
   if (error.status == 400) {
       if (error.error !== undefined && error.error.message !== undefined) {
        this.statusMsg.next(error.error.message);
       }
       return
   }
 }

 getJobs(identity: Identity) {
  let headers = new HttpHeaders();
  let options = { headers: headers, withCredentials: true};
  // remove from the job list any jobs for identities that we don't know about
  let oldjobs = identity.joblist.value;
  let bi = new BatchInterface();
  bi.cancelcmd = identity.site.cancelcmd;
  bi.statcmd = identity.site.statcmd;
  let params = new URLSearchParams();
  params.set('statcmd',JSON.stringify(identity.site.statcmd));
  params.set('host',JSON.stringify(identity.site.host));
  params.set('username',JSON.stringify(identity.username));
  
  this.updateJobSub = this.http.get<Job[]>(this.Base+'/stat'+'?'+params.toString(),options)
                .subscribe(resp => this.updateJoblist(resp, identity),
                           error => this.getJobsError(error, identity));
}

getUserHealth(identity: Identity)  {
  let headers = new HttpHeaders();
  let options = { headers: headers, withCredentials: true};
  // remove from the job list any jobs for identities that we don't know about
  let params = new URLSearchParams();
  if (identity === undefined || identity === null) {
    return
  }
  if (identity.site.userhealth === undefined) {
    identity.accountalerts.next([]);
    return
  }
  params.set('statcmd',JSON.stringify(identity.site.userhealth));
  params.set('host',JSON.stringify(identity.site.host));
  params.set('username',JSON.stringify(identity.username));
  
  this.updateUserHealthSub = this.http.get<Health[]>(this.Base+'/stat'+'?'+params.toString(),options)
    .pipe(takeUntil(this.cancelRequests$))
    .subscribe(resp => this.addUserHealth(identity,resp), error => this.getUserHealthError(error,identity));
}

getHealthAlerts(identity: Identity) {
  //identity.accountalerts.next(null);
  //identity.systemalerts.next([]);
  this.getCachetIncidents(identity);
  this.getUserHealth(identity);
}

getCachetIncidents(identity: Identity) {
  let headers = new HttpHeaders();
  let options = { headers: headers, withCredentials: false};
  // remove from the job list any jobs for identities that we don't know about
  let params = new URLSearchParams();

  if (identity.site.cacheturis === undefined ||  identity.site.cacheturis.length == 0) {
    identity.systemalerts.next([]);
    return
  }
  for (let uri of identity.site.cacheturis) {
    this.http.get(uri,options)
      .pipe(takeUntil(this.cancelRequests$))
      .subscribe(resp => this.addCachetIncidents(identity,resp), error => this.getCachetIncidentsError(error,identity));
  }
}

addCachetIncidents(identity,resp) {
  console.log('got an sa response');
  /*let ci = identity.systemalerts.value;
  if (ci == null) {
    ci = []
  }*/
  let ci = [];
  for (let i of resp.data) {
    if (i.status == 3 || i.status == 4) {
      continue;
    }
    let h = new Health();
    h.stat = 'error';
    h.msg = i.message;
    ci.push(h);
  }
  identity.systemalerts.next(ci);
  console.log('update system alerts for ',identity.displayName());
  console.log(identity.systemalerts.value);
  console.log(identity.systemalerts);
}

addUserHealth(identity,resp) {
  /*let ci = identity.accountalerts.value;
  if (ci == null) {
    ci = []
  }*/
  let ci = []
  for (let i of resp) {
    let h = new Health();
    h.stat = i.stat;
    h.msg = i.message;
    if (i.title != undefined) {
      h.title = i.title;
    }
    if (i.type != undefined) {
      h.type = i.type;
      h.data = i.data;
    }
    ci.push(h);
  }
  console.log('update account alerts for ',identity.displayName());
  identity.accountalerts.next(ci);
  console.log(identity.accountalerts.value);
  console.log(identity.accountalerts);
}



 public getconfig(app: Strudelapp, identity: Identity): Observable<any> {
   let headers = new HttpHeaders();
   let options = { headers: headers, withCredentials: true};
   return this.http.get<any>(identity.site.url+'getconfig/'+app.name,options)
                                        // .pipe(catchError(this.handleError))
}

 submissionError(error: any) {
   if (error.status != 0) {
       if ('error' in error && 'message' in error.error) {
         this.statusMsg.next(error.error.message);
       } else {
         this.statusMsg.next('Job submission failed');
       }
   }
 }
 cancelError(error: any) {
     console.log('error canceling job',error);
   if (error.status != 0) {
       if ('error' in error && 'message' in error.error) {
         this.statusMsg.next(error.error.message);
       } else {
         this.statusMsg.next('Job submission failed');
       }
   }
 }

 buildBody(app: Strudelapp, appparams?: string) {
   return JSON.stringify({'app': app, 'appparams': appparams});
 }

 submit(app: Strudelapp, identity: Identity, batchinterface: BatchInterface, appparams?: any) {
   let headers = new HttpHeaders();
   let options = { headers: headers, withCredentials: true};
   this.statusMsg.next('Submitting job');
   let paramstr = this.buildParams(app,identity,batchinterface);
   // let body = this.buildBody(app,appparams)
   let keys = JSON.stringify(this.authorisationService.getKeys());
   let loggedin = JSON.stringify(this.authorisationService.loggedInAuthZ.value);
   let ids = [];
     for (let id of this.computesitesService.ftidentities.value) {
         ids.push(id.copy_skip_catalog())
     }
   let body = {'app': app, 'appparams': appparams, 'keys': keys, 'ids': JSON.stringify(JSON.stringify(ids))}
   this.http.post<any>(this.Base+'/submit'+'?'+paramstr, body, options)
                                          .subscribe(resp => {
                                                              this.statusMsg.next(null)
                                                            },
                                                    error => this.submissionError(error));
 }

 submitted(resp: any, identity: Identity ) {
   this.getJobs(identity);
 }

 cancel(job: Job) {
   let headers = new HttpHeaders();
   let options = { headers: headers, withCredentials: true};
   // this.statusMsg.next(null);
   let data = {};
   let bi = new BatchInterface();
   bi.statcmd = job.identity.site.statcmd;
   bi.cancelcmd = job.identity.site.cancelcmd;
   let paramstr = this.buildParams(job.app,job.identity,bi);
   this.http.delete<any>(this.Base+'/cancel/'+job.jobid+'?'+paramstr, options)
         .subscribe(resp => this.submitted(resp,job.identity),
                    error => this.cancelError(error));
 }

 public watchAppwindow(appwindow, dialogRef) {
   if (appwindow.closed) {
     dialogRef.close();
   }
 }

 public getAppInstance(job: Job, action: AppAction) {
   let username = job.identity.username;
   let loginhost = job.identity.site.host;
   let batchhost = job.batch_host;
   let jobid = job.jobid;
   let params = new URLSearchParams;
   let headers = new HttpHeaders();
   let options = { headers: headers, withCredentials: true};
   params.set('cmd',JSON.stringify(action.paramscmd));
   let paramstr = params.toString();
   job.connectionState = 1;
   this.http.get<string>(this.Base+'/appinstance/'+username+'/'+loginhost+'/'+batchhost+'/'+jobid+'?'+paramstr, options)
                // .pipe(catchError(this.handleError))
     .subscribe(resp =>  { job.appinst = resp; if (action.client != null) { this.createTunnel(job, action) } else { job.connectionState = 0} },
             error => { this.handleAppInstanceError(job,error) })
   // let paramstr = this.buildParams(job.app,job.identity,this.batchinterface[job.identity.repr()]);
   // let headers = new HttpHeaders();
   // let options = { headers: headers, withCredentials: true};
   // this.http.get<any>(this.Base+'/getappinst/'+paramstr,options)
   //                                      .pipe(catchError(this.handleError))
   //                                      .subscribe(resp =>  { job.appinst = <StrudelappInstance>resp; this.openAppWindow(job);});
 }

 public createTunnel(job: Job, action: AppAction) {
   let username = job.identity.username;
   let loginhost = job.identity.site.host;
   let batchhost = job.batch_host;
   let params = new URLSearchParams;
   let headers = new HttpHeaders();
   job.connectionState = 2;

     //    let sleepDuration = 20;
     //var now = new Date().getTime();
     //while(new Date().getTime() < now + sleepDuration){ /* do nothing */ }

   let options = { headers: headers, withCredentials: true};
   //params.set('cmd',JSON.stringify(action.paramscmd));
   let paramstr = params.toString();
   this.http.post<string>(this.Base+'/createtunnel/'+username+'/'+loginhost+'/'+batchhost+'?'+paramstr, job.appinst, options)
                .subscribe(() =>  { this.getAppUrl(job, action) } )
 }

 public getAppUrl(job: Job, action: AppAction) {
   let params = new URLSearchParams;
   let headers = new HttpHeaders();
   let options = { headers: headers, withCredentials: true};
   let pseudoapp = {'client':{'redir':action.client.redir}};
   params.set('app',JSON.stringify(pseudoapp));
   params.set('appinst',JSON.stringify(job.appinst));
   let paramstr = params.toString();
   job.connectionState = 3;
   this.http.get<string>(this.Base+'/appurl?'+paramstr,options)
                .pipe(catchError(this.handleError))
                .subscribe(resp => {  job.connectionState = 0; this.openAppWindow(resp,job)});


 }

 public getInterface(job: Job, action: AppAction) {
   this.getAppInstance(job, action);
 }

 public openAppWindow(url: any, job: Job) {
     var re = /^https:\/\/([a-z0-9\.-]+)\/?/;
     let twshost = this.twsproxy.replace(re,"$1");
     let windowloc = url.replace(/\{twsproxy\}/g,this.twsproxy).replace(/twshost/g,twshost);

     let appwindow = window.open(windowloc);
     if (appwindow == null) {
         this.statusMsg.next('It looks like a window failed to open. Please check your popup blocker settings (Strudel 2 needs to be able to open a window to your application');
         return;
     }
     if (appwindow.closed) {
       return
     }
     this.openapps.push({'window':appwindow,'job':job})
     
 }

 public connect(job: Job, action: AppAction, appinst?: any) {
   let headers = new HttpHeaders();
   let options = { headers: headers, withCredentials: true};
   this.getInterface(job,action); // getInterface will subsequently called getAppInstance, which will call createTunnel, which will openAppWindow
 }




public postAgentData(keyCert: KeyCert) {
  let headers = new HttpHeaders();
  let options = { headers: headers, withCredentials: true};

  this.statusMsg.next("Authorising ...")
  let data = {'key': keyCert.key, 'cert': keyCert.cert};
  return this.http.post<any>(this.Base+'/sshagent',data,options)
                      .pipe(catchError(this.handleError))

}

public postMkDir(id: Identity, path: string, name: string ) {
  let headers = new HttpHeaders();
  let options = { headers: headers, withCredentials: true};
  let params = new URLSearchParams;
  params.set('identity',JSON.stringify(id));
  params.set('path',JSON.stringify(path));

  return this.http.post<any>(this.Base+'/mkdir?'+params.toString(),name, options);
}

public getSftpData(id: Identity, path: string, cd: string ) {
  let headers = new HttpHeaders();
  let options = { headers: headers, withCredentials: true};
  let params = new URLSearchParams;
  params.set('identity',JSON.stringify(id));
  params.set('path',JSON.stringify(path));
  params.set('cd',JSON.stringify(cd));

  return this.http.get<any>(this.Base+'/ls?'+params.toString(),options)
                      // .pipe(catchError(this.handleError))

}



public getstatusMsgSubject(): BehaviorSubject<any> {
  return this.statusMsg;
}

private httperror(errorstr: string) {
  var re = /login expired/gi;
  let searchresult = errorstr.search(re);
  if (searchresult != -1) {
    this.statusMsg.next("Some authentication tokens have expired, you may need to log in again");
    console.error(errorstr);
    this.authorisationService.updateAgentContents();
  }
  console.error(errorstr);
}

// private networkError(error: HttpErrorResponse) {
//   if (error.error instanceof ErrorEvent) {
//     console.log('network error contacting TES backend');
//   } else {
//     return error;
//   }
// }


private handleAppInstanceError(job: Job, error: any) {
    console.log(error);
    job.connectionState=0;
    if (error.status == 0) {
      this.statusMsg.next('It appears we had a timeout learning about your '+job.name+'. Its possible '+job.identity.site.name+' is experiencing issues');
      return;
    }
    if (error.error !== undefined && error.error.message !== undefined) {
        this.statusMsg.next(error.error.message);
    } else if (error.error !== undefined && error.error.error !== undefined) {
      this.statusMsg.next(error.error.error.msg);
    } else {
        this.statusMsg.next(error);
    }
}

private handleError(error: HttpErrorResponse) {
  console.error('in handleError');
  console.error(error);
  if (error.error instanceof ErrorEvent) {
    // A client-side or network error occurred. Handle it accordingly.
    return throwError("Hmm, that didn't work. If you're using a local connection, please make sure Strudel-TES is running.");
  } else {
    // Not sure if this code works correctly. It should update identities in case the error is
    // that the user isn't allowed to run the job

    var re = /identity/gi;
    if (error.error.message != undefined) {
      let searchresult = error.error.message.search(re);
      if (searchresult != -1) {
        // this.getIdentities();
        return throwError('login expired, refreshing');
      }
      return throwError(error.error.message)
    } else {
      return throwError('An error occured but I\'m not sure exactly what. Please try again latter or contact the sys admins');
    }
    // this.statusMsg.next("There was an error submitting that job. The backend gave me the message: " + error.error.message);

  }
}



}