module.exports = unpublish

var log = require("npmlog")
  , npm = require("./npm.js")
  , readJson = require("read-package-json")
  , path = require("path")
  , mapToRegistry = require("./utils/map-to-registry.js")
  , npa = require("npm-package-arg")

unpublish.usage = "npm unpublish <project>[@<version>]"

unpublish.completion = function (opts, cb) {
  if (opts.conf.argv.remain.length >= 3) return cb()
  npm.commands.whoami([], true, function (er, username) {
    if (er) return cb()

    var un = encodeURIComponent(username)
    if (!un) return cb()
    var byUser = "-/by-user/" + un
    mapToRegistry(byUser, npm.config, function (er, uri, auth) {
      if (er) return cb(er)

      npm.registry.get(uri, { auth : auth }, function (er, pkgs) {
        // do a bit of filtering at this point, so that we don't need
        // to fetch versions for more than one thing, but also don't
        // accidentally a whole project.
        pkgs = pkgs[un]
        if (!pkgs || !pkgs.length) return cb()
        var pp = npa(opts.partialWord).name
        pkgs = pkgs.filter(function (p) {
          return p.indexOf(pp) === 0
        })
        if (pkgs.length > 1) return cb(null, pkgs)
        mapToRegistry(pkgs[0], npm.config, function (er, uri, auth) {
          if (er) return cb(er)

          npm.registry.get(uri, { auth : auth }, function (er, d) {
            if (er) return cb(er)
            var vers = Object.keys(d.versions)
            if (!vers.length) return cb(null, pkgs)
            return cb(null, vers.map(function (v) {
              return pkgs[0] + "@" + v
            }))
          })
        })
      })
    })
  })
}

function unpublish (args, cb) {
  if (args.length > 1) return cb(unpublish.usage)

  var thing = args.length ? npa(args[0]) : {}
    , project = thing.name
    , version = thing.rawSpec

  log.silly("unpublish", "args[0]", args[0])
  log.silly("unpublish", "thing", thing)
  if (!version && !npm.config.get("force")) {
    return cb("Refusing to delete entire project.\n"
             + "Run with --force to do this.\n"
             + unpublish.usage)
  }

  if (!project || path.resolve(project) === npm.localPrefix) {
    // if there's a package.json in the current folder, then
    // read the package name and version out of that.
    var cwdJson = path.join(npm.localPrefix, "package.json")
    return readJson(cwdJson, function (er, data) {
      if (er && er.code !== "ENOENT" && er.code !== "ENOTDIR") return cb(er)
      if (er) return cb("Usage:\n" + unpublish.usage)
      gotProject(data.name, data.version, cb)
    })
  }
  return gotProject(project, version, cb)
}

function gotProject (project, version, cb_) {
  function cb (er) {
    if (er) return cb_(er)
    console.log("- " + project + (version ? "@" + version : ""))
    cb_()
  }

  // remove from the cache first
  npm.commands.cache(["clean", project, version], function (er) {
    if (er) {
      log.error("unpublish", "Failed to clean cache")
      return cb(er)
    }

    mapToRegistry(project, npm.config, function (er, uri, auth) {
      if (er) return cb(er)

      var params = {
        version : version,
        auth    : auth
      }
      npm.registry.unpublish(uri, params, cb)
    })
  })
}