import * as plugins from './qenv.plugins'
import * as helpers from './qenv.helpers'

export interface IKeyValueObject {
  key: string,
  value: string
}

export class Qenv {
  requiredEnvVars: string[] = []
  availableEnvVars: string[] = []
  missingEnvVars: string[] = []
  keyValueObjectArray: IKeyValueObject[] = []
  constructor (basePathArg = process.cwd(), envYmlPathArg, failOnMissing = true) {
    basePathArg = plugins.path.resolve(basePathArg)
    envYmlPathArg = plugins.path.resolve(envYmlPathArg)
    helpers.getRequiredEnvVars(basePathArg, this.requiredEnvVars)
    helpers.getAvailableEnvVars(this.requiredEnvVars, envYmlPathArg, this.availableEnvVars, this.keyValueObjectArray)
    this.missingEnvVars = helpers.getMissingEnvVars(this.requiredEnvVars, this.availableEnvVars)

    // handle missing variables
    if (this.missingEnvVars.length > 0) {
      console.info('Required Env Vars are:')
      console.log(this.requiredEnvVars)
      console.error('However some Env variables could not be resolved:')
      console.log(this.missingEnvVars)
      if (failOnMissing) {
        console.error('Exiting!')
        process.exit(1)
      }
    }
  }

  getEnvVar (envVarName): string {
    return process.env[envVarName]
  }
}