export class Attachment
{
  //Required
  private name: string;
  private src: string;
  private key: string;

  //Optional
  private size: number = 0;

  constructor(name: string, src: string)
  {
    this.src = src;
    this.name = name + this.setExtension();
    this.key = this.setKey();
  }

  setSize(size: number): Attachment
  {
    this.size = size;
    return this;
  }

  get Src(): string
  {
    return this.src;
  }

  get Key(): string
  {
    return this.key;
  }

  get Name(): string
  {
    return this.name;
  }

  get Size(): number
  {
    return this.size;
  }

  private setExtension()
  {
    const len = this.src.length;
    let ext: string = '';
    for (var i = len - 1; i >= 0; i--) {
      ext += this.src[i]
      if (this.src[i] == '.') break;
    }
    return ext.split('').reverse().join('')
  }

  private setKey(): string
  {
    const chars = '0123456789'
    let _key: string = ''
    for (var i = 1; i <= 10; i++) {
      _key += chars.charAt(Math.floor(Math.random() * 10))
    }
    _key += ('_' + this.name);
    return _key;
  }

  toJSON(): any
  {
    return {
      attachment_name: this.name,
      attachment_key: this.key,
      size: this.size
    }
  }
}