module.exports = star

var assert = require("assert")

function star (uri, params, cb) {
  assert(typeof uri === "string", "must pass registry URI to star")
  assert(params && typeof params === "object", "must pass params to star")
  assert(typeof cb === "function", "must pass callback to star")

  var starred = params.starred ? true : false

  var auth = params.auth
  assert(auth && typeof auth === "object", "must pass auth to star")
  if (!(auth.token || (auth.password && auth.username && auth.email))) {
    var er = new Error("Must be logged in to star/unstar packages")
    er.code = "ENEEDAUTH"
    return cb(er)
  }

  var client = this
  this.request(uri+"?write=true", { auth : auth }, function (er, fullData) {
    if (er) return cb(er)

    client.whoami(uri, params, function (er, username) {
      if (er) return cb(er)

      var data = {
        _id : fullData._id,
        _rev : fullData._rev,
        users : fullData.users || {}
      }

      if (starred) {
        client.log.info("starring", data._id)
        data.users[username] = true
        client.log.verbose("starring", data)
      }
      else {
        delete data.users[username]
        client.log.info("unstarring", data._id)
        client.log.verbose("unstarring", data)
      }

      var options = {
        method : "PUT",
        body : data,
        auth : auth
      }
      return client.request(uri, options, cb)
    })
  })
}
