import * as faSolid from '@fortawesome/free-solid-svg-icons'
import * as faBrands from '@fortawesome/free-brands-svg-icons'
import * as faRegular from '@fortawesome/free-regular-svg-icons'
import { IconDefinition } from '@fortawesome/fontawesome-common-types'

export interface IconInterface {
  id: string,
  width: number,
  height: number,
  path: string
}

export class IconService {

  static snakeToCamel(str: string): string {
    return str.replace(
      /([-_][a-z])/g,
      group => group.toUpperCase().replace('-', '').replace('_', '')
    )
  }
  
  static getIcon(id: string): IconInterface|null {
    let components: string[] = id.split(id.indexOf('_') !== -1 ? '_' : ' ')
    if (components.length < 2) {
      return null
    }
    let iconSet: any = {}
    switch (components[0]) {
      case 'fas':
        iconSet = faSolid
        break
      case 'fab':
        iconSet = faBrands
        break
      case 'far':
        iconSet = faRegular
        break
    }
    let iconName: string = this.snakeToCamel(components[1])
    let iconVal: IconDefinition|undefined = iconSet[iconName]
    if (iconVal === undefined) {
      return null
    }
    return {
      id: components[0] + ' ' + components[1],
      width: iconVal.icon[0],
      height: iconVal.icon[1],
      path: iconVal.icon[4] as string
    }
  }
}