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.............................................................................                                                  
                                                                                                                                                                                     'use strict'

const BB = require('bluebird')

const Fetcher = require('../fetch')
const glob = BB.promisify(require('glob'))
const packDir = require('../util/pack-dir')
const readJson = require('../util/read-json')
const path = require('path')
const pipe = BB.promisify(require('mississippi').pipe)
const through = require('mississippi').through
const normalizePackageBin = require('npm-normalize-package-bin')

const readFileAsync = BB.promisify(require('fs').readFile)

const fetchDirectory = module.exports = Object.create(null)

Fetcher.impl(fetchDirectory, {
  packument (spec, opts) {
    return this.manifest(spec, opts).then(manifest => {
      return Object.assign({}, manifest, {
        'dist-tags': {
          'latest': manifest.version
        },
        time: {
          [manifest.version]: (new Date()).toISOString()
        },
        versions: {
          [manifest.version]: manifest
        }
      })
    })
  },
  // `directory` manifests come from the actual manifest/lockfile data.
  manifest (spec, opts) {
    const pkgPath = path.join(spec.fetchSpec, 'package.json')
    const srPath = path.join(spec.fetchSpec, 'npm-shrinkwrap.json')
    return BB.join(
      readFileAsync(pkgPath).then(readJson).catch({ code: 'ENOENT' }, err => {
        err.code = 'ENOPACKAGEJSON'
        throw err
      }),
      readFileAsync(srPath).then(readJson).catch({ code: 'ENOENT' }, () => null),
      (pkg, sr) => {
        pkg._shrinkwrap = sr
        pkg._hasShrinkwrap = !!sr
        pkg._resolved = spec.fetchSpec
        pkg._integrity = false // Don't auto-calculate integrity
        pkg._shasum = false // Don't auto-calculate shasum either
        return pkg
      }
    ).then(pkg => {
      if (!pkg.bin && pkg.directories && pkg.directories.bin) {
        const dirBin = pkg.directories.bin
        return glob(path.join(spec.fetchSpec, dirBin, '/**'), { nodir: true }).then(matches => {
          matches.forEach(filePath => {
            const relative = path.relative(spec.fetchSpec, filePath)
            if (relative && relative[0] !== '.') {
              if (!pkg.bin) { pkg.bin = {} }
              pkg.bin[path.basename(relative)] = relative
            }
          })
        }).then(() => pkg)
      } else {
        return pkg
      }
    }).then(pkg => normalizePackageBin(pkg))
  },

  // As of npm@5, the npm installer doesn't pack + install directories: it just
  // creates symlinks. This code is here because `npm pack` still needs the
  // ability to create a tarball from a local directory.
  tarball (spec, opts) {
    const stream = through()
    this.manifest(spec, opts).then(mani => {
      return pipe(this.fromManifest(mani, spec, opts), stream)
    }).catch(err => stream.emit('error', err))
    return stream
  },

  // `directory` tarballs are generated in a very similar way to git tarballs.
  fromManifest (manifest, spec, opts) {
    const stream = through()
    packDir(manifest, manifest._resolved, manifest._resolved, stream, opts).catch(err => {
      stream.emit('error', err)
    })
    return stream
  }
})