import logger from './util/logger'
import parseString from './parseString'
import denormalise from './denormalise'
import toSVG from './toSVG'
import toPolylines from './toPolylines'
import groupEntitiesByLayer from './groupEntitiesByLayer'

export default class Helper {
  constructor (contents) {
    if (!(typeof contents === 'string')) {
      throw Error('Helper constructor expects a DXF string')
    }
    this._contents = contents
    this._parsed = null
    this._denormalised = null
  }

  parse () {
    this._parsed = parseString(this._contents)
    logger.info('parsed:', this.parsed)
    return this._parsed
  }

  get parsed () {
    if (this._parsed === null) {
      this.parse()
    }
    return this._parsed
  }

  denormalise () {
    this._denormalised = denormalise(this.parsed)
    logger.info('denormalised:', this._denormalised)
    return this._denormalised
  }

  get denormalised () {
    if (!this._denormalised) {
      this.denormalise()
    }
    return this._denormalised
  }

  group () {
    this._groups = groupEntitiesByLayer(this.denormalised)
  }

  get groups () {
    if (!this._groups) {
      this.group()
    }
    return this._groups
  }

  toSVG () {
    return toSVG(this.parsed)
  }

  toPolylines () {
    return toPolylines(this.parsed)
  }
}