const temp = require('temp')
const fs = require('fs')
const path = require('path')
const childProcess = require('child_process')
const GitHubApi = require('github')
const { GitProcess } = require('dugite')
const request = require('request')
const rootPackageJson = require('../package.json')

if (!process.env.ELECTRON_NPM_OTP) {
  console.error('Please set ELECTRON_NPM_OTP')
  process.exit(1)
}

const github = new GitHubApi({
  // debug: true,
  headers: { 'User-Agent': 'electron-npm-publisher' },
  followRedirects: false
})

let tempDir
temp.track() // track and cleanup files at exit

const files = [
  'cli.js',
  'index.js',
  'install.js',
  'package.json',
  'README.md',
  'LICENSE'
]

const jsonFields = [
  'name',
  'version',
  'repository',
  'description',
  'license',
  'author',
  'keywords'
]

let npmTag = ''

new Promise((resolve, reject) => {
  temp.mkdir('electron-npm', (err, dirPath) => {
    if (err) {
      reject(err)
    } else {
      resolve(dirPath)
    }
  })
})
  .then((dirPath) => {
    tempDir = dirPath
    // copy files from `/npm` to temp directory
    files.forEach((name) => {
      const noThirdSegment = name === 'README.md' || name === 'LICENSE'
      fs.writeFileSync(
        path.join(tempDir, name),
        fs.readFileSync(path.join(__dirname, '..', noThirdSegment ? '' : 'npm', name))
      )
    })
    // copy from root package.json to temp/package.json
    const packageJson = require(path.join(tempDir, 'package.json'))
    jsonFields.forEach((fieldName) => {
      packageJson[fieldName] = rootPackageJson[fieldName]
    })
    fs.writeFileSync(
      path.join(tempDir, 'package.json'),
      JSON.stringify(packageJson, null, 2)
    )

    return github.repos.getReleases({
      owner: 'electron',
      repo: rootPackageJson.version.indexOf('nightly') > 0 ? 'nightlies' : 'electron'
    })
  })
  .then((releases) => {
  // download electron.d.ts from release
    const release = releases.data.find(
      (release) => release.tag_name === `v${rootPackageJson.version}`
    )
    if (!release) {
      throw new Error(`cannot find release with tag v${rootPackageJson.version}`)
    }
    return release
  })
  .then((release) => {
    const tsdAsset = release.assets.find((asset) => asset.name === 'electron.d.ts')
    if (!tsdAsset) {
      throw new Error(`cannot find electron.d.ts from v${rootPackageJson.version} release assets`)
    }
    return new Promise((resolve, reject) => {
      request.get({
        url: tsdAsset.url,
        headers: {
          'accept': 'application/octet-stream',
          'user-agent': 'electron-npm-publisher'
        }
      }, (err, response, body) => {
        if (err || response.statusCode !== 200) {
          reject(err || new Error('Cannot download electron.d.ts'))
        } else {
          fs.writeFileSync(path.join(tempDir, 'electron.d.ts'), body)
          resolve(release)
        }
      })
    })
  })
  .then(async (release) => {
    if (release.tag_name.indexOf('nightly') > 0) {
      const currentBranch = await getCurrentBranch()
      if (currentBranch === 'master') {
        npmTag = 'nightly'
      } else {
        npmTag = `nightly-${currentBranch}`
      }
    } else {
      npmTag = release.prerelease ? 'beta' : 'latest'
    }
  })
  .then(() => childProcess.execSync('npm pack', { cwd: tempDir }))
  .then(() => {
  // test that the package can install electron prebuilt from github release
    const tarballPath = path.join(tempDir, `${rootPackageJson.name}-${rootPackageJson.version}.tgz`)
    return new Promise((resolve, reject) => {
      childProcess.execSync(`npm install ${tarballPath} --force --silent`, {
        env: Object.assign({}, process.env, { electron_config_cache: tempDir }),
        cwd: tempDir
      })
      resolve(tarballPath)
    })
  })
  .then((tarballPath) => childProcess.execSync(`npm publish ${tarballPath} --tag ${npmTag} --otp=${process.env.ELECTRON_NPM_OTP}`))
  .catch((err) => {
    console.error(`Error: ${err}`)
    process.exit(1)
  })

async function getCurrentBranch () {
  const gitDir = path.resolve(__dirname, '..')
  console.log(`Determining current git branch`)
  const gitArgs = ['rev-parse', '--abbrev-ref', 'HEAD']
  const branchDetails = await GitProcess.exec(gitArgs, gitDir)
  if (branchDetails.exitCode === 0) {
    const currentBranch = branchDetails.stdout.trim()
    console.log(`Successfully determined current git branch is ` +
      `${currentBranch}`)
    return currentBranch
  } else {
    const error = GitProcess.parseError(branchDetails.stderr)
    console.log(`Could not get details for the current branch,
      error was ${branchDetails.stderr}`, error)
    process.exit(1)
  }
}