import * as plugins from './npmextra.plugins'
import * as paths from './npmextra.paths'

/**
 * Npmextra class allows easy configuration of tools
 */
export class Npmextra {
  cwd: string
  lookupPath: string
  npmextraJsonExists: boolean
  npmextraJsonData: any

  /**
   * creates instance of Npmextra
   */
  constructor (cwdArg?: string) {
    if (cwdArg) {
      this.cwd = cwdArg
    } else {
      this.cwd = paths.cwd
    }
    this.checkLookupPath()
    this.checkNpmextraJsonExists()
    this.checkNpmextraJsonData()
  }

  /**
   * merges the supplied options with the ones from npmextra.json
   */
  dataFor<IToolConfig>(toolnameArg: string, defaultOptionsArg: any): IToolConfig {
    let npmextraToolOptions
    if (this.npmextraJsonData[ toolnameArg ]) {
      npmextraToolOptions = this.npmextraJsonData[ toolnameArg ]
    } else {
      npmextraToolOptions = {}
    }
    let mergedOptions = plugins.smartlodash.merge({}, defaultOptionsArg, npmextraToolOptions)
    return mergedOptions
  }

  /**
   * checks if the JSON exists
   */
  private checkNpmextraJsonExists() {
    this.npmextraJsonExists = plugins.smartfile.fs.fileExistsSync(this.lookupPath)
  }

  /**
   * gets lookupPath
   */
  private checkLookupPath() {
    if (this.cwd) {
      this.lookupPath = plugins.path.join(this.cwd, 'npmextra.json')
    } else {
      this.lookupPath = paths.configFile
    };
  }

  /**
   * get npmextraJsonData
   */
  private checkNpmextraJsonData() {
    if (this.npmextraJsonExists) {
      this.npmextraJsonData = plugins.smartfile.fs.toObjectSync(this.lookupPath)
    } else {
      this.npmextraJsonData = {}
    }
  }

}