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// Copyright 2010-2012 Mikeal Rogers
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.

'use strict'

var extend                = require('extend')
  , cookies               = require('./lib/cookies')
  , helpers               = require('./lib/helpers')

var isFunction            = helpers.isFunction
  , paramsHaveRequestBody = helpers.paramsHaveRequestBody


// organize params for patch, post, put, head, del
function initParams(uri, options, callback) {
  if (typeof options === 'function') {
    callback = options
  }

  var params = {}
  if (typeof options === 'object') {
    extend(params, options, {uri: uri})
  } else if (typeof uri === 'string') {
    extend(params, {uri: uri})
  } else {
    extend(params, uri)
  }

  params.callback = callback
  return params
}

function request (uri, options, callback) {
  if (typeof uri === 'undefined') {
    throw new Error('undefined is not a valid uri or options object.')
  }

  var params = initParams(uri, options, callback)

  if (params.method === 'HEAD' && paramsHaveRequestBody(params)) {
    throw new Error('HTTP HEAD requests MUST NOT include a request body.')
  }

  return new request.Request(params)
}

function verbFunc (verb) {
  var method = verb === 'del' ? 'DELETE' : verb.toUpperCase()
  return function (uri, options, callback) {
    var params = initParams(uri, options, callback)
    params.method = method
    return request(params, params.callback)
  }
}

// define like this to please codeintel/intellisense IDEs
request.get = verbFunc('get')
request.head = verbFunc('head')
request.post = verbFunc('post')
request.put = verbFunc('put')
request.patch = verbFunc('patch')
request.del = verbFunc('del')

request.jar = function (store) {
  return cookies.jar(store)
}

request.cookie = function (str) {
  return cookies.parse(str)
}

function wrapRequestMethod (method, options, requester, verb) {

  return function (uri, opts, callback) {
    var params = initParams(uri, opts, callback)

    var target = {}
    extend(true, target, options, params)

    target.pool = params.pool || options.pool

    if (verb) {
      target.method = (verb === 'del' ? 'DELETE' : verb.toUpperCase())
    }

    if (isFunction(requester)) {
      method = requester
    }

    return method(target, target.callback)
  }
}

request.defaults = function (options, requester) {
  var self = this

  options = options || {}

  if (typeof options === 'function') {
    requester = options
    options = {}
  }

  var defaults      = wrapRequestMethod(self, options, requester)

  var verbs = ['get', 'head', 'post', 'put', 'patch', 'del']
  verbs.forEach(function(verb) {
    defaults[verb]  = wrapRequestMethod(self[verb], options, requester, verb)
  })

  defaults.cookie   = wrapRequestMethod(self.cookie, options, requester)
  defaults.jar      = self.jar
  defaults.defaults = self.defaults
  return defaults
}

request.forever = function (agentOptions, optionsArg) {
  var options = {}
  if (optionsArg) {
    extend(options, optionsArg)
  }
  if (agentOptions) {
    options.agentOptions = agentOptions
  }

  options.forever = true
  return request.defaults(options)
}

// Exports

module.exports = request
request.Request = require('./request')
request.initParams = initParams

// Backwards compatibility for request.debug
Object.defineProperty(request, 'debug', {
  enumerable : true,
  get : function() {
    return request.Request.debug
  },
  set : function(debug) {
    request.Request.debug = debug
  }
})