'use strict'
  
  var fs = require('fs')
  var qs = require('querystring')
  var validate = require('har-validator')
  var extend = require('extend')
  
  function Har (request) {
    this.request = request
  }
  
  Har.prototype.reducer = function (obj, pair) {
    // new property ?
    if (obj[pair.name] === undefined) {
      obj[pair.name] = pair.value
      return obj
    }
  
    // existing? convert to array
    var arr = [
      obj[pair.name],
      pair.value
    ]
  
    obj[pair.name] = arr
  
    return obj
  }
  
  Har.prototype.prep = function (data) {
    // construct utility properties
    data.queryObj = {}
    data.headersObj = {}
    data.postData.jsonObj = false
    data.postData.paramsObj = false
  
    // construct query objects
    if (data.queryString && data.queryString.length) {
      data.queryObj = data.queryString.reduce(this.reducer, {})
    }
  
    // construct headers objects
    if (data.headers && data.headers.length) {
      // loweCase header keys
      data.headersObj = data.headers.reduceRight(function (headers, header) {
        headers[header.name] = header.value
        return headers
      }, {})
    }
  
    // construct Cookie header
    if (data.cookies && data.cookies.length) {
      var cookies = data.cookies.map(function (cookie) {
        return cookie.name + '=' + cookie.value
      })
  
      if (cookies.length) {
        data.headersObj.cookie = cookies.join('; ')
      }
    }
  
    // prep body
    function some (arr) {
      return arr.some(function (type) {
        return data.postData.mimeType.indexOf(type) === 0
      })
    }
  
    if (some([
      'multipart/mixed',
      'multipart/related',
      'multipart/form-data',
      'multipart/alternative'])) {
  
      // reset values
      data.postData.mimeType = 'multipart/form-data'
    }
  
    else if (some([
      'application/x-www-form-urlencoded'])) {
  
      if (!data.postData.params) {
        data.postData.text = ''
      } else {
        data.postData.paramsObj = data.postData.params.reduce(this.reducer, {})
  
        // always overwrite
        data.postData.text = qs.stringify(data.postData.paramsObj)
      }
    }
  
    else if (some([
      'text/json',
      'text/x-json',
      'application/json',
      'application/x-json'])) {
  
      data.postData.mimeType = 'application/json'
  
      if (data.postData.text) {
        try {
          data.postData.jsonObj = JSON.parse(data.postData.text)
        } catch (e) {
          this.request.debug(e)
  
          // force back to text/plain
          data.postData.mimeType = 'text/plain'
        }
      }
    }
  
    return data
  }
  
  Har.prototype.options = function (options) {
    // skip if no har property defined
    if (!options.har) {
      return options
    }
  
    var har = {}
    extend(har, options.har)
  
    // only process the first entry
    if (har.log && har.log.entries) {
      har = har.log.entries[0]
    }
  
    // add optional properties to make validation successful
    har.url = har.url || options.url || options.uri || options.baseUrl || '/'
    har.httpVersion = har.httpVersion || 'HTTP/1.1'
    har.queryString = har.queryString || []
    har.headers = har.headers || []
    har.cookies = har.cookies || []
    har.postData = har.postData || {}
    har.postData.mimeType = har.postData.mimeType || 'application/octet-stream'
  
    har.bodySize = 0
    har.headersSize = 0
    har.postData.size = 0
  
    if (!validate.request(har)) {
      return options
    }
  
    // clean up and get some utility properties
    var req = this.prep(har)
  
    // construct new options
    if (req.url) {
      options.url = req.url
    }
  
    if (req.method) {
      options.method = req.method
    }
  
    if (Object.keys(req.queryObj).length) {
      options.qs = req.queryObj
    }
  
    if (Object.keys(req.headersObj).length) {
      options.headers = req.headersObj
    }
  
    function test (type) {
      return req.postData.mimeType.indexOf(type) === 0
    }
    if (test('application/x-www-form-urlencoded')) {
      options.form = req.postData.paramsObj
    }
    else if (test('application/json')) {
      if (req.postData.jsonObj) {
        options.body = req.postData.jsonObj
        options.json = true
      }
    }
    else if (test('multipart/form-data')) {
      options.formData = {}
  
      req.postData.params.forEach(function (param) {
        var attachment = {}
  
        if (!param.fileName && !param.fileName && !param.contentType) {
          options.formData[param.name] = param.value
          return
        }
  
        // attempt to read from disk!
        if (param.fileName && !param.value) {
          attachment.value = fs.createReadStream(param.fileName)
        } else if (param.value) {
          attachment.value = param.value
        }
  
        if (param.fileName) {
          attachment.options = {
            filename: param.fileName,
            contentType: param.contentType ? param.contentType : null
          }
        }
  
        options.formData[param.name] = attachment
      })
    }
    else {
      if (req.postData.text) {
        options.body = req.postData.text
      }
    }
  
    return options
  }
  
  exports.Har = Har