import {Component, Input, Output, EventEmitter, OnInit, ViewChild} from '@angular/core';
import {FormBuilder, FormGroup, Validators} from '@angular/forms';
import {HttpResponse} from '@angular/common/http';
import {PopoverConfig} from 'ngx-bootstrap/popover';
import {CommandExecutorService} from '../common/services/command-executor.service';
import {MessageService} from '../common/services/message.service';
import * as Utils from '../common/utils/ngx-text-editor.utils';

@Component({
  selector:    'ngx-text-editor-toolbar',
  templateUrl: './ngx-text-editor-toolbar.component.html',
  styleUrls: [
    './ngx-text-editor-toolbar.component.scss'
  ],
  providers:[PopoverConfig]
})

export class NgxTextEditorToolbarComponent implements OnInit {
  /** holds values of the insert link form */
  urlForm:FormGroup;

  /** holds values of the insert image form */
  imageForm:FormGroup;

  /** holds values of the insert video form */
  videoForm:FormGroup;

  /** set to false when image is being uploaded */
  uploadComplete = true;

  /** upload percentage */
  updloadPercentage = 0;

  /** set to true when the image is being uploaded */
  isUploading = false;

  /** which tab to active for color insertion */
  selectedColorTab = 'textColor';

  /** font family name */
  fontName = '';

  /** font size */
  fontSize = '';

  /** hex color code */
  hexColor = '';

  /** show/hide image uploader */
  isImageUploader = false;

  wasH1Pressed = false;

  /**
   * Editor configuration
   */
  @Input() config:any;
  @ViewChild('urlPopover', { static: true }) urlPopover;
  @ViewChild('imagePopover', { static: true }) imagePopover;
  @ViewChild('videoPopover', { static: true }) videoPopover;
  @ViewChild('fontSizePopover', { static: true }) fontSizePopover;
  @ViewChild('colorPopover', { static: true }) colorPopover;

  /**
   * Emits an event when a toolbar button is clicked
   */
  @Output() execute:EventEmitter<string> = new EventEmitter<string>();

  /**
   * Emits an event then an image is selected
   */
  @Output() uploadImage:EventEmitter<HTMLInputElement> = new EventEmitter<HTMLInputElement>();

  constructor(private _popOverConfig:PopoverConfig,
    private _formBuilder:FormBuilder,
    private _messageService:MessageService,
    private _commandExecutorService:CommandExecutorService) {
    this._popOverConfig.outsideClick = true;
    this._popOverConfig.placement = 'bottom';
    this._popOverConfig.container = 'body';
  }

  /**
   * enable or diable toolbar based on configuration
   *
   * @param value name of the toolbar buttons
   */
  canEnableToolbarOptions(value):boolean {
    return Utils.canEnableToolbarOptions(value, this.config['toolbar']);
  }

  /**
   * triggers command from the toolbar to be executed and emits an event
   *
   * @param command name of the command to be executed
   */
  triggerCommand(command:string):void {
    this.execute.emit(command);
  }

  /**
   * create URL insert form
   */
  buildUrlForm():void {
    this.urlForm = this._formBuilder.group({
      urlLink:['', [Validators.required]],
      urlText:['', [Validators.required]],
      urlNewTab:[true]
    });
  }

  /**
   * inserts link in the editor
   */
  insertLink():void {
    try {
      this._commandExecutorService.createLink(this.urlForm.value);
    } catch (error) {
      this._messageService.sendMessage(error.message);
    }

    /** reset form to default */
    this.buildUrlForm();
    /** close inset URL pop up */
    this.urlPopover.hide();
  }

  /**
   * create insert image form
   */
  buildImageForm():void {
    this.imageForm = this._formBuilder.group({
      imageUrl:['', [Validators.required]]
    });
  }

  /**
   * create insert image form
   */
  buildVideoForm():void {
    this.videoForm = this._formBuilder.group({
      videoUrl:['', [Validators.required]],
      height:[''],
      width:['']
    });
  }

  /**
   * Executed when file is selected
   *
   * @param e onChange event
   */
  onFileChange(e):void {
    this.uploadComplete = false;
    this.isUploading = true;

    if (e.target.files.length > 0) {
      const file = e.target.files[0];

      if (!this.config.imageEndPoint) {
        this.uploadImage.emit(file);
        this.uploadComplete = true;
        this.isUploading = false;
      } else {
        try {
          this._commandExecutorService.uploadImage(file, this.config.imageEndPoint).subscribe(event => {
            if (event.type) {
              this.updloadPercentage = Math.round(100 * event.loaded / event.total);
            }

            if (event instanceof HttpResponse) {
              try {
                this._commandExecutorService.insertImage(event.body.url);
              } catch (error) {
                this._messageService.sendMessage(error.message);
              }
              this.uploadComplete = true;
              this.isUploading = false;
            }
          });
        } catch (error) {
          this._messageService.sendMessage(error.message);
          this.uploadComplete = true;
          this.isUploading = false;
        }
      }
    }
  }

  /** insert image in the editor */
  insertImage():void {
    try {
      this._commandExecutorService.insertImage(this.imageForm.value.imageUrl);
    } catch (error) {
      this._messageService.sendMessage(error.message);
    }

    /** reset form to default */
    this.buildImageForm();
    /** close inset URL pop up */
    this.imagePopover.hide();
  }

  /** insert image in the editor */
  insertVideo():void {
    try {
      this._commandExecutorService.insertVideo(this.videoForm.value);
    } catch (error) {
      this._messageService.sendMessage(error.message);
    }

    /** reset form to default */
    this.buildVideoForm();
    /** close inset URL pop up */
    this.videoPopover.hide();
  }

  /** inser text/background color */
  insertColor(color:string, where:string):void {
    try {
      this._commandExecutorService.insertColor(color, where);
    } catch (error) {
      this._messageService.sendMessage(error.message);
    }

    this.colorPopover.hide();
  }

  /** set font size */
  setFontSize(fontSize:string):void {
    try {
      this._commandExecutorService.setFontSize(fontSize);
    } catch (error) {
      this._messageService.sendMessage(error.message);
    }

    this.fontSizePopover.hide();
  }

  /** set font Name/family */
  setFontName(fontName:string):void {
    try {
      this._commandExecutorService.setFontName(fontName);
    } catch (error) {
      this._messageService.sendMessage(error.message);
    }

    this.fontSizePopover.hide();
  }

  ngOnInit():void {
    this.buildUrlForm();
    this.buildImageForm();
    this.buildVideoForm();
  }

  toggleHeading(heading:string):void {
    if (!this.wasH1Pressed) {
      this.execute.emit(heading);
    } else {
      this.execute.emit('clear');
    }

    this.wasH1Pressed = !this.wasH1Pressed;
  }
}