'use strict'
var utils = require('./utils')

var noop = utils.noop
var assign = utils.assign

function RouteNode (options) {
  options = options || {}
  this._debug = !!options.debug
  this._exact = Object.create(null)
}

assign(RouteNode.prototype, {
  handler: null,

  add: function add(parts, handler, context) {
    parts = parts || []
    handler = handler || noop
    context = context || null

    if (parts.length === 0) {
      this.handler = handler
      this.context = context
      return this
    }
    var part = parts.shift()
    var node = this._exact[part]
    if (node == null) {
      node = new RouteNode({debug: this._debug})
      this._exact[part] = node
    }
    return node.add(parts, handler, context)
  },

  get: function get(parts, args, done) {
    parts = parts || []
    args = args || []

    if (parts.length === 0) {
      return done(null, this.handler, this.context, args)
    }
    var part = parts.shift()
    var childNode = this._exact[part]
    if (childNode) {
      return childNode.get(parts, args, done)
    } else {
      return done(new Error('not found'))
    }
  }

})

module.exports = RouteNode