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/*global require:true */

(function () {
  'use strict';

  var 

    // node imports
    http = require('http'),
    querystring = require('querystring'),
    
    // save reference to global object
    // `window` in browser
    // `exports` on server
    root = this,
    ejs;
  
  // create namespace
  // use existing ejs object if it exists  
  if (typeof exports !== 'undefined') {
    ejs = exports;
  } else {
    if (root.ejs == null) {
      ejs = root.ejs = {};
    } else {
      ejs = root.ejs;
    }
  }
  
  /**
    @class
    A <code>NodeClient</code> is a type of <code>client</code> that uses
    NodeJS http module for communication with ElasticSearch.
    
    @name ejs.NodeClient

    @desc
    A client that uses the NodeJS http module for communication.

    @param {String} host the hostname of your ElasticSearch server.  ie. localhost
    @param {String} post the post of your ElasticSearch server. ie. 9200
    */
  ejs.NodeClient = function (host, port) {
    var 
    
      // method to ensure the path always starts with a slash
      getPath = function (path) {
        if (path.charAt(0) !== '/') {
          path = '/' + path;
        }
        
        return path;
      };
    
    return {
    
      /**
            Sets the ElasticSearch host.

            @member ejs.NodeClient
            @param {String} h the hostname of the ElasticSearch server
            @returns {Object} returns <code>this</code> so that calls can be 
              chained. Returns {String} current value if `h` is not specified.
            */
      host: function (h) {
        if (h == null) {
          return host;
        }
        
        host = h;
        return this;
      },
      
      /**
            Sets the ElasticSearch port.

            @member ejs.NodeClient
            @param {String} p the port of the ElasticSearch server
            @returns {Object} returns <code>this</code> so that calls can be 
              chained. Returns {String} current value if `p` is not specified.
            */
      port: function (p) {
        if (p == null) {
          return port;
        }
        
        port = p;
        return this;
      },
      
      /**
            Performs HTTP GET requests against the server.

            @member ejs.NodeClient
            @param {String} path the path to GET from the server
            @param {Object} data an object of url parameters for the request
            @param {Function} successcb a callback function that will be called with
              the results of the request.
            @param {Function} errorcb a callback function that will be called
                when there is an error with the request
            */
      get: function (path, data, successcb, errorcb) {
        var 
        
          opt = {
            host: host,
            port: port,
            path: path + '?' + querystring.stringify(data),
            method: 'GET'
          },
          
          req = http.request(opt, function (res) {
            var resData = '';
            res.setEncoding('utf8');

            res.on('data', function (chunk) {
              resData = resData + chunk;
            });

            res.on('end', function () {
              if (successcb != null) {
                successcb(JSON.parse(resData));
              }
            });
            
          });
        
        // handle request errors
        if (errorcb != null) {
          req.on('error', errorcb);
        }
        
        req.end();
      },
      
      /**
            Performs HTTP POST requests against the server.

            @member ejs.NodeClient
            @param {String} path the path to POST to on the server
            @param {String} data the POST body
            @param {Function} successcb a callback function that will be called with
              the results of the request.
            @param {Function} errorcb a callback function that will be called
                when there is an error with the request
            */
      post: function (path, data, successcb, errorcb) {
        var 
        
          opt = {
            host: host,
            port: port,
            path: path,
            method: 'POST',
            headers: {
              'Content-Type': 'application/json'
            }
          },
          
          req = http.request(opt, function (res) {
            var resData = '';
            res.setEncoding('utf8');

            res.on('data', function (chunk) {
              resData = resData + chunk;
            });

            res.on('end', function () {
              if (successcb != null) {
                successcb(JSON.parse(resData));
              }
            });
            
          });
        
        // handle request errors
        if (errorcb != null) {
          req.on('error', errorcb);
        }
          
        req.write(data);
        req.end();        
      },
      
      /**
            Performs HTTP PUT requests against the server.

            @member ejs.NodeClient
            @param {String} path the path to PUT to on the server
            @param {String} data the PUT body
            @param {Function} successcb a callback function that will be called with
              the results of the request. 
            @param {Function} errorcb a callback function that will be called
                when there is an error with the request
            */
      put: function (path, data, successcb, errorcb) {
        var 
        
          opt = {
            host: host,
            port: port,
            path: path,
            method: 'PUT',
            headers: {
              'Content-Type': 'application/json'
            }
          },
          
          req = http.request(opt, function (res) {
            var resData = '';
            res.setEncoding('utf8');

            res.on('data', function (chunk) {
              resData = resData + chunk;
            });

            res.on('end', function () {
              if (successcb != null) {
                successcb(JSON.parse(resData));
              }
            });
            
          });
        
        // handle request errors
        if (errorcb != null) {
          req.on('error', errorcb);
        }
          
        req.write(data);
        req.end();        
      },
      
      /**
            Performs HTTP DELETE requests against the server.

            @member ejs.NodeClient
            @param {String} path the path to DELETE to on the server
            @param {String} data the DELETE body
            @param {Function} successcb a callback function that will be called with
              the results of the request.
            @param {Function} errorcb a callback function that will be called
                when there is an error with the request
            */
      del: function (path, data, successcb, errorcb) {
        var 
        
          opt = {
            host: host,
            port: port,
            path: path,
            method: 'DELETE',
            headers: {
              'Content-Type': 'application/json'
            }
          },
          
          req = http.request(opt, function (res) {
            var resData = '';
            res.setEncoding('utf8');

            res.on('data', function (chunk) {
              resData = resData + chunk;
            });

            res.on('end', function () {
              if (successcb != null) {
                successcb(JSON.parse(resData));
              }
            });
            
          });
          
        // handle request errors
        if (errorcb != null) {
          req.on('error', errorcb);
        }
          
        req.write(data);
        req.end();        
      },
      
      /**
            Performs HTTP HEAD requests against the server. Same as 
            <code>get</code>, except only returns headers.

            @member ejs.NodeClient
            @param {String} path the path to HEAD to on the server
            @param {Object} data an object of url parameters.
            @param {Function} successcb a callback function that will be called with
              the an object of the returned headers.
            @param {Function} errorcb a callback function that will be called
                when there is an error with the request
            */
      head: function (path, data, successcb, errorcb) {
        var 
        
          opt = {
            host: host,
            port: port,
            path: path + '?' + querystring.stringify(data),
            method: 'HEAD'
          },
          
          req = http.request(opt, function (res) {
            if (successcb != null) {
              successcb(res.headers);
            }
          });
        
        // handle request errors
        if (errorcb != null) {
          req.on('error', errorcb);
        }
          
        req.end();        
      }
    };
  };

}).call(this);
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