import * as path from 'path'
import * as Promise from 'bluebird'
import * as fs from 'fs-extra-promise'
import {inc as incrementVersion} from 'semver'
import { ReleaseType } from 'semver'

interface Manifest {
  name: string,
  version: string
}

export default class PresentationVersion {
  private packagePath: string
  private bowerPath: string

  constructor(directory: string){
    this.packagePath = path.resolve(directory, 'package.json')
    this.bowerPath = path.resolve(directory, 'bower.json')
  }

  get (): Promise<string> {
    return fs.readJsonAsync(this.packagePath)
      .get<string>('version')
  }

  set (version: string): Promise<void[]> {
    return this.setVersion(version)
  }

  increment (release: string): Promise<void[]> {
    return this.get()
      .then(version => incrementVersion(version, <ReleaseType> release))
      .then(version => this.setVersion(version))
  }

  private setVersion (version: string | null): Promise<void[]> {
    return Promise.map([this.packagePath, this.bowerPath], (file: string) => {
      return fs.readJsonAsync(file)
        .then((data: Manifest) => {
          var updatedData = {
            ...data,
            version 
          };

          return fs.outputJsonAsync(file, updatedData)
        })
        .catch((err) => {
          if(err.code !== 'ENOENT'){
            throw err
          }
        })
    })
  }
}