// get a url to a tarball, fetch it, read the package.json, and
// publish to the registry.

module.exports = publish

var fs = require("fs")
  , path = require("path")
  , chain = require("./utils/chain")
  , rm = require("./utils/rm-rf")
  , readJson = require("./utils/read-json")
  , exec = require("./utils/exec")
  , mkdir = require("./utils/mkdir-p")
  , log = require("./utils/log")
  , semver = require("./utils/semver")
  , fetch = require("./utils/fetch")
  , registry = require("./utils/registry")
  , npm = require("../npm")
  , url = require("url")

function publish (args, cb) {
  var tarball = args.shift()
    , u = url.parse(tarball)

  if (!(u && u.protocol && u.host)) {
    return cb(new Error("Invalid remote tarball url: "+tarball))
  }

  var targetDir = path.join(npm.tmp,
        tarball.replace(/[^a-zA-Z0-9]/g, "-")+"-"+ Date.now()+"-"+Math.random())
    , targetFile = targetDir + ".tgz"

  chain
    ( [mkdir, targetDir]
    , [fetch, tarball, targetFile]
    , [unpackTar, targetFile, targetDir]
    , function (cb) {
        readJson(path.join(targetDir, "package.json"), function (er, data) {
          if (er) return cb(er)
          registry.publish(data, tarball, cb)
        })
      }
      // cleanup
    , [rm, targetFile]
    , [rm, targetDir]
    , cb
    )
}

function unpackTar (tarball, unpackTarget, cb) {
  exec("tar", ["xzvf", tarball, "--strip", "1", "-C", unpackTarget], cb)
}