# All files / tar/lib pack.js

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     'use strict'

    // A readable tar stream creator
    // Technically, this is a transform stream that you write paths into,
    // and tar format comes out of.
    // The `add()` method is like `write()` but returns this,
    // and end() return `this` as well, so you can
    // do `new Pack(opt).add('files').add('dir').end().pipe(output)
    // You could also do something like:
    // streamOfPaths().pipe(new Pack()).pipe(new fs.WriteStream('out.tar'))

    class PackJob {
      constructor (path, absolute) {
        this.path = path || './'
        this.absolute = absolute
        this.entry = null
        this.stat = null
        this.readdir = null
        this.pending = false
        this.ignore = false
        this.piped = false
      }
    }

    const MiniPass = require('minipass')
    const zlib = require('minizlib')
    const ReadEntry = require('./read-entry.js')
    const WriteEntry = require('./write-entry.js')
    const WriteEntrySync = WriteEntry.Sync
    const WriteEntryTar = WriteEntry.Tar
    const Yallist = require('yallist')
    const EOF = Buffer.alloc(1024)
    const ONSTAT = Symbol('onStat')
    const ENDED = Symbol('ended')
    const QUEUE = Symbol('queue')
    const CURRENT = Symbol('current')
    const PROCESS = Symbol('process')
    const PROCESSING = Symbol('processing')
    const PROCESSJOB = Symbol('processJob')
    const JOBS = Symbol('jobs')
    const JOBDONE = Symbol('jobDone')
    const ADDFSENTRY = Symbol('addFSEntry')
    const ADDTARENTRY = Symbol('addTarEntry')
    const STAT = Symbol('stat')
    const READDIR = Symbol('readdir')
    const ONREADDIR = Symbol('onreaddir')
    const PIPE = Symbol('pipe')
    const ENTRY = Symbol('entry')
    const ENTRYOPT = Symbol('entryOpt')
    const WRITEENTRYCLASS = Symbol('writeEntryClass')
    const WRITE = Symbol('write')
    const ONDRAIN = Symbol('ondrain')

    const fs = require('fs')
    const path = require('path')
    const warner = require('./warn-mixin.js')

    const Pack = warner(class Pack extends MiniPass {
      constructor (opt) {
        super(opt)
        opt = opt || Object.create(null)
        this.opt = opt
        this.cwd = opt.cwd || process.cwd()
        this.maxReadSize = opt.maxReadSize
        this.preservePaths = !!opt.preservePaths
        this.strict = !!opt.strict
        this.noPax = !!opt.noPax
        this.prefix = (opt.prefix || '').replace(/(\\|\/)+$/, '')
        this.linkCache = opt.linkCache || new Map()
        this.statCache = opt.statCache || new Map()
        this.readdirCache = opt.readdirCache || new Map()
        this[WRITEENTRYCLASS] = WriteEntry
        if (typeof opt.onwarn === 'function')
          this.on('warn', opt.onwarn)

        this.zip = null
        if (opt.gzip) {
          if (typeof opt.gzip !== 'object')
            opt.gzip = {}
          this.zip = new zlib.Gzip(opt.gzip)
          this.zip.on('data', chunk => super.write(chunk))
          this.zip.on('end', _ => super.end())
          this.zip.on('drain', _ => this[ONDRAIN]())
          this.on('resume', _ => this.zip.resume())
        } else
          this.on('drain', this[ONDRAIN])

        this.portable = !!opt.portable
        this.noDirRecurse = !!opt.noDirRecurse
        this.follow = !!opt.follow
        this.noMtime = !!opt.noMtime

        this.filter = typeof opt.filter === 'function' ? opt.filter : _ => true

        this[QUEUE] = new Yallist
        this[JOBS] = 0
        this.jobs = +opt.jobs || 4
        this[PROCESSING] = false
        this[ENDED] = false
      }

      [WRITE] (chunk) {
        return super.write(chunk)
      }

      add (path) {
        this.write(path)
        return this
      }

      end (path) {
        if (path)
          this.write(path)
        this[ENDED] = true
        this[PROCESS]()
        return this
      }

      write (path) {
        if (this[ENDED])
          throw new Error('write after end')

        if (path instanceof ReadEntry)
          this[ADDTARENTRY](path)
        else
          this[ADDFSENTRY](path)
        return this.flowing
      }

      [ADDTARENTRY] (p) {
        const absolute = path.resolve(this.cwd, p.path)
        if (this.prefix)
          p.path = this.prefix + '/' + p.path.replace(/^\.(\/+|$)/, '')

        // in this case, we don't have to wait for the stat
        if (!this.filter(p.path, p))
          p.resume()
        else {
          const job = new PackJob(p.path, absolute, false)
          job.entry = new WriteEntryTar(p, this[ENTRYOPT](job))
          job.entry.on('end', _ => this[JOBDONE](job))
          this[JOBS] += 1
          this[QUEUE].push(job)
        }

        this[PROCESS]()
      }

      [ADDFSENTRY] (p) {
        const absolute = path.resolve(this.cwd, p)
        if (this.prefix)
          p = this.prefix + '/' + p.replace(/^\.(\/+|$)/, '')

        this[QUEUE].push(new PackJob(p, absolute))
        this[PROCESS]()
      }

      [STAT] (job) {
        job.pending = true
        this[JOBS] += 1
        const stat = this.follow ? 'stat' : 'lstat'
        fs[stat](job.absolute, (er, stat) => {
          job.pending = false
          this[JOBS] -= 1
          if (er)
            this.emit('error', er)
          else
            this[ONSTAT](job, stat)
        })
      }

      [ONSTAT] (job, stat) {
        this.statCache.set(job.absolute, stat)
        job.stat = stat

        // now we have the stat, we can filter it.
        if (!this.filter(job.path, stat))
          job.ignore = true

        this[PROCESS]()
      }

      [READDIR] (job) {
        job.pending = true
        this[JOBS] += 1
        fs.readdir(job.absolute, (er, entries) => {
          job.pending = false
          this[JOBS] -= 1
          if (er)
            return this.emit('error', er)
          this[ONREADDIR](job, entries)
        })
      }

      [ONREADDIR] (job, entries) {
        this.readdirCache.set(job.absolute, entries)
        job.readdir = entries
        this[PROCESS]()
      }

      [PROCESS] () {
        if (this[PROCESSING])
          return

        this[PROCESSING] = true
        for (let w = this[QUEUE].head;
             w !== null && this[JOBS] < this.jobs;
             w = w.next) {
          this[PROCESSJOB](w.value)
          if (w.value.ignore) {
            const p = w.next
            this[QUEUE].removeNode(w)
            w.next = p
          }
        }

        this[PROCESSING] = false

        if (this[ENDED] && !this[QUEUE].length && this[JOBS] === 0) {
          if (this.zip)
            this.zip.end(EOF)
          else {
            super.write(EOF)
            super.end()
          }
        }
      }

      get [CURRENT] () {
        return this[QUEUE] && this[QUEUE].head && this[QUEUE].head.value
      }

      [JOBDONE] (job) {
        this[QUEUE].shift()
        this[JOBS] -= 1
        this[PROCESS]()
      }

      [PROCESSJOB] (job) {
        if (job.pending)
          return

        if (job.entry) {
          if (job === this[CURRENT] && !job.piped)
            this[PIPE](job)
          return
        }

        if (!job.stat) {
          if (this.statCache.has(job.absolute))
            this[ONSTAT](job, this.statCache.get(job.absolute))
          else
            this[STAT](job)
        }
        if (!job.stat)
          return

        // filtered out!
        if (job.ignore)
          return

        if (!this.noDirRecurse && job.stat.isDirectory() && !job.readdir) {
          if (this.readdirCache.has(job.absolute))
            this[ONREADDIR](job, this.readdirCache.get(job.absolute))
          else
            this[READDIR](job)
          if (!job.readdir)
            return
        }

        // we know it doesn't have an entry, because that got checked above
        job.entry = this[ENTRY](job)
        if (!job.entry) {
          job.ignore = true
          return
        }

        if (job === this[CURRENT] && !job.piped)
          this[PIPE](job)
      }

      [ENTRYOPT] (job) {
        return {
          onwarn: (msg, data) => {
            this.warn(msg, data)
          },
          noPax: this.noPax,
          cwd: this.cwd,
          absolute: job.absolute,
          preservePaths: this.preservePaths,
          maxReadSize: this.maxReadSize,
          strict: this.strict,
          portable: this.portable,
          linkCache: this.linkCache,
          statCache: this.statCache,
          noMtime: this.noMtime
        }
      }

      [ENTRY] (job) {
        this[JOBS] += 1
        try {
          return new this[WRITEENTRYCLASS](job.path, this[ENTRYOPT](job))
            .on('end', () => this[JOBDONE](job))
            .on('error', er => this.emit('error', er))
        } catch (er) {
          this.emit('error', er)
        }
      }

      [ONDRAIN] () {
        if (this[CURRENT] && this[CURRENT].entry)
          this[CURRENT].entry.resume()
      }

      // like .pipe() but using super, because our write() is special
      [PIPE] (job) {
        job.piped = true

        if (job.readdir)
          job.readdir.forEach(entry => {
            const p = this.prefix ?
              job.path.slice(this.prefix.length + 1) || './'
              : job.path

            const base = p === './' ? '' : p.replace(/\/*$/, '/')
            this[ADDFSENTRY](base + entry)
          })

        const source = job.entry
        const zip = this.zip

        if (zip)
          source.on('data', chunk => {
            if (!zip.write(chunk))
              source.pause()
          })
        else
          source.on('data', chunk => {
            if (!super.write(chunk))
              source.pause()
          })
      }

      pause () {
        if (this.zip)
          this.zip.pause()
        return super.pause()
      }
    })

    class PackSync extends Pack {
      constructor (opt) {
        super(opt)
        this[WRITEENTRYCLASS] = WriteEntrySync
      }

      // pause/resume are no-ops in sync streams.
      pause () {}
      resume () {}

      [STAT] (job) {
        const stat = this.follow ? 'statSync' : 'lstatSync'
        this[ONSTAT](job, fs[stat](job.absolute))
      }

      [READDIR] (job, stat) {
        this[ONREADDIR](job, fs.readdirSync(job.absolute))
      }

      // gotta get it all in this tick
      [PIPE] (job) {
        const source = job.entry
        const zip = this.zip

        if (job.readdir)
          job.readdir.forEach(entry => {
            const p = this.prefix ?
              job.path.slice(this.prefix.length + 1) || './'
              : job.path

            const base = p === './' ? '' : p.replace(/\/*$/, '/')
            this[ADDFSENTRY](base + entry)
          })

        if (zip)
          source.on('data', chunk => {
            zip.write(chunk)
          })
        else
          source.on('data', chunk => {
            super[WRITE](chunk)
          })
      }
    }

    Pack.Sync = PackSync

    module.exports = Pack