/**
* @license
* Copyright (C) 2017-2018 "IoT.bzh"
* Author Sebastien Douheret <sebastien@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

import { Component, OnInit } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';
import { Subscription } from 'rxjs/Subscription';

import { NgbModal } from '@ng-bootstrap/ng-bootstrap';

import { TargetService, TargetType, ITarget, ITerminal, TerminalType, ITerminalOutput } from '../../../@core-xds/services/target.service';
import { AlertService } from '../../../@core-xds/services/alert.service';

@Component({
  selector: 'xds-terminals',
  styleUrls: ['./terminals.component.scss'],
  templateUrl: './terminals.component.html',
})
export class TerminalsComponent implements OnInit {

  public curTarget: ITarget;
  public xTermStdout: string;
  public xTermDisable: boolean;

  protected curTermID: string;

  private termOut$: Subject<ITerminalOutput>;
  private termSubs: Subscription;

  constructor(
    private modalService: NgbModal,
    private targetSvr: TargetService,
    private alert: AlertService,
  ) {
    this.xTermStdout = '';
    this.xTermDisable = true;
    this.curTarget = null;
    this.curTermID = '';
  }

  ngOnInit() {
    this.targetSvr.curTarget$.subscribe(p => this.curTarget = p);
  }

  openTerm() {
    if (this.curTarget == null || this.curTarget.id === '') {
      return;
    }

    // FIXME: don't always use 1st terminal
    if (this.curTarget.terms.length > 0) {
      this.curTermID = this.curTarget.terms[0].id;
    }

    this.targetSvr.terminalOpen(this.curTarget.id, this.curTermID)
      .subscribe(
        res => {
          this.termOut$ = this.targetSvr.terminalOutput$;

          this.termSubs = this.termOut$.subscribe(termOut => {
            this.xTermStdout = termOut.stdout + termOut.stderr;
          });

          this.xTermDisable = false;
        },
        err => {
          this.alert.error(err);
        },
    );
  }

  closeTerm() {
    if (this.curTarget == null || this.curTarget.id === '' || this.curTermID === '') {
      return;
    }
    this.targetSvr.terminalClose(this.curTarget.id, this.curTermID)
      .subscribe(res => {
        this.curTermID = '';
        this.xTermStdout = '\r\n*** Terminal closed ***\n\n\r';
        if (this.termSubs !== undefined) {
          this.termSubs.unsubscribe();
          this.termOut$ = undefined;
        }
        this.xTermDisable = true;
      });
  }

  onXTermData(data: string) {
    if (this.termOut$ !== undefined && !this.termOut$.closed) {
      this.targetSvr.terminalWrite(data);
    }
  }

  onResize(sz) {
    if (this.termOut$ !== undefined && !this.termOut$.closed) {
      this.targetSvr.terminalResize(this.curTarget.id, this.curTermID, sz.cols, sz.rows).subscribe();
    }
  }

}