/**
 * Copyright 2015 IBM Corp.
 *
 * 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 events = require('events');
var util = require('util');
var Client = require('node-ssdp').Client;
var xml2js  = require('xml2js');
var request = require('request');
var http = require('http');
var url = require('url');
var Q = require('q');

var urn = 'urn:Belkin:service:basicevent:1';
var postbodyheader = [
  '<?xml version="1.0" encoding="utf-8"?>',
  '<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">',
    '<s:Body>'].join('\n');


var postbodyfooter = ['</s:Body>',
  '</s:Envelope>'
].join('\n');


var getenddevs = {};
getenddevs.path = '/upnp/control/bridge1';
getenddevs.action = '"urn:Belkin:service:bridge:1#GetEndDevices"';
getenddevs.body = [
  postbodyheader, 
  '<u:GetEndDevices xmlns:u="urn:Belkin:service:bridge:1">', 
  '<DevUDN>%s</DevUDN>', 
  '<ReqListType>PAIRED_LIST</ReqListType>',
  '</u:GetEndDevices>',
  postbodyfooter
].join('\n');

var getcapabilities = {};
getcapabilities.path = '/upnp/control/bridge1';
getcapabilities.action = '"urn:Belkin:service:bridge:1#GetCapabilityProfileIDList"';
getcapabilities.body = [
  postbodyheader, 
  '<u:GetCapabilityProfileIDList xmlns:u="urn:Belkin:service:bridge:1">', 
  '<DevUDN>%s</DevUDN>', 
  '</u:GetCapabilityProfileIDList>',
  postbodyfooter
].join('\n');


var WeMoNG = function () {
  this.devices = {};
  this._client;
  this._interval;
  events.EventEmitter.call(this);

}

util.inherits(WeMoNG, events.EventEmitter);

WeMoNG.prototype.start = function start() {
  //console.log("searching");
  var _wemo = this;
  _wemo._client = new Client();
  _wemo._client.setMaxListeners(0);
  _wemo._client.on('response', function (headers, statusCode, rinfo) {
    var location = url.parse(headers.LOCATION);
    var port = location.port;
    request.get(location.href, function(err, res, xml) {
      if (!err) {
        xml2js.parseString(xml, function(err, json) {
          if (!err) {
            var device = { ip: location.hostname, port: location.port };
            for (var key in json.root.device[0]) {
              device[key] = json.root.device[0][key][0];
            }
            if (device.deviceType == "urn:Belkin:device:bridge:1") {
              //console.log( device.ip + ' -' + device.deviceType);
              var ip = device.ip;
              var port = device.port;
              var udn = device.UDN;
              var postoptions = {
                host: ip,
                port: port,
                path: getenddevs.path,
                method: 'POST',
                headers: {
                  'SOAPACTION': getenddevs.action,
                  'Content-Type': 'text/xml; charset="utf-8"',
                  'Accept': ''
                }
              };

              var post_request = http.request(postoptions, function(res) {
                var data = "";
                res.setEncoding('utf8');
                res.on('data', function(chunk) {
                  data += chunk;
                });

                res.on('end',function() {
                  xml2js.parseString(data, function(err, result) {
                    if(!err) {
                      var list = result["s:Envelope"]["s:Body"][0]["u:GetEndDevicesResponse"][0].DeviceLists[0];
                      xml2js.parseString(list, function(err, result2) {
                        if (!err) {
                          var devinfo = result2.DeviceLists.DeviceList[0].DeviceInfos[0].DeviceInfo;
                          for (var i=0; i<devinfo.length; i++) {
                            var light = {
                              "ip": ip,
                              "port": port,
                              "udn": device.UDN,
                              "name": devinfo[i].FriendlyName[0],
                              "id": devinfo[i].DeviceID[0],
                              "capabilities": devinfo[i].CapabilityIDs[0],
                              "state": devinfo[i].CurrentState[0],
                              "type": "light",
                              "device": device
                            };
                            var key = device.serialNumber + "-" + light.id;
                            if (!_wemo.devices[key]){
                              _wemo.devices[key] = light;
                              _wemo.emit('discovered', key);
                            } else {
                              _wemo.devices[key] = light;
                            }
                          }
                          var groupinfo = result2.DeviceLists.DeviceList[0].GroupInfos;
                          if (groupinfo) {
                            for(var i=0; i<groupinfo.length; i++) {
                              var group = {
                                "ip": ip,
                                "port": port,
                                "udn": device.UDN,
                                "name": groupinfo[i].GroupInfo[0].GroupName[0],
                                "id": groupinfo[i].GroupInfo[0].GroupID[0],
                                "capabilities": groupinfo[i].GroupInfo[0].GroupCapabilityIDs[0],
                                "state": groupinfo[i].GroupInfo[0].GroupCapabilityValues[0],
                                "type": "light group",
                                "lights": [],
                                "device": device
                              }
                              for(var j=0; j<groupinfo[i].GroupInfo[0].DeviceInfos[0].DeviceInfo.length; j++) {
                                group.lights.push(groupinfo[i].GroupInfo[0].DeviceInfos[0].DeviceInfo[j].DeviceID[0]);
                              }
                            }
                            var key = device.serialNumber + "-" + group.id;
                            if (!_wemo.devices[key]) {
                              _wemo.devices[key] = group;
                              _wemo.emit('discovered', key);
                            } else {
                              _wemo.devices[key] = group;
                            }
                          }
                        }
                      });
                    }
                  });
                });
              });

              post_request.write(util.format(getenddevs.body, udn));
              post_request.end();

            } else if (device.deviceType.indexOf('urn:Belkin:device') != -1) {
              //socket
              var socket = {
                "ip": location.hostname,
                "port": location.port,
                "name": device.friendlyName,
                "type": "socket",
                "device": device
              };
              if (!_wemo.devices[device.serialNumber]) {
                _wemo.devices[device.serialNumber] = socket;
                _wemo.emit('discovered',device.serialNumber);
              } else {
                _wemo.devices[device.serialNumber] = socket;
              }
            } else {
              //other stuff
              //console.log( device.ip + ' -' + device.deviceType);
            }
          } else {
            console.error("failed to parse respose from " + location.href);
            console.error(err);
          }
        });
      } else {
        console.error("Failed to GET info from " + location.href);
        console.error(err);
      }
    });
  });
  _wemo._client.search(urn);
  setTimeout(function(){
    //console.log("stopping");
    _wemo._client._stop();
    //console.log("%j", devices);
  }, 10000);
}

WeMoNG.prototype.get = function get(deviceID) {
  return this.devices[deviceID];
}

WeMoNG.prototype.toggleSocket = function toggleSocket(socket, on) {
  var postoptions = {
    host: socket.ip,
    port: socket.port,
    path: "/upnp/control/basicevent1",
    method: 'POST',
    headers: {
      'SOAPACTION': '"urn:Belkin:service:basicevent:1#SetBinaryState"',
      'Content-Type': 'text/xml; charset="utf-8"',
      'Accept': ''
    }
  };

    var post_request = http.request(postoptions, function(res) {
      var data = "";
      res.setEncoding('utf8');
      res.on('data', function(chunk){
        data += chunk
      });

      res.on('end', function(){
        //console.log(data);
      });
    });

    post_request.on('error', function (e) {
      console.log(e);
      console.log("%j", postoptions);
    });

    var body = [
      postbodyheader,
      '<u:SetBinaryState xmlns:u="urn:Belkin:service:basicevent:1">',
      '<BinaryState>%s</BinaryState>',
      '</u:SetBinaryState>',
      postbodyfooter
    ].join('\n');

    post_request.write(util.format(body, on));
    post_request.end();
}

WeMoNG.prototype.setStatus = function setStatus(light, capability, value) {
  var setdevstatus = {};
  setdevstatus.path = '/upnp/control/bridge1';
  setdevstatus.action = '"urn:Belkin:service:bridge:1#SetDeviceStatus"';
  setdevstatus.body = [
    postbodyheader,
    '<u:SetDeviceStatus xmlns:u="urn:Belkin:service:bridge:1">',
    '<DeviceStatusList>',
    '&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;&lt;DeviceStatus&gt;&lt;IsGroupAction&gt;NO&lt;/IsGroupAction&gt;&lt;DeviceID available=&quot;YES&quot;&gt;%s&lt;/DeviceID&gt;&lt;CapabilityID&gt;%s&lt;/CapabilityID&gt;&lt;CapabilityValue&gt;%s&lt;/CapabilityValue&gt;&lt;/DeviceStatus&gt;',
    '</DeviceStatusList>',
    '</u:SetDeviceStatus>',
    postbodyfooter
  ].join('\n');

  var postoptions = {
    host: light.ip,
    port: light.port,
    path: setdevstatus.path,
    method: 'POST',
    headers: {
      'SOAPACTION': setdevstatus.action,
       'Content-Type': 'text/xml; charset="utf-8"',
      'Accept': ''
    }
  };

  var post_request = http.request(postoptions, function(res) {
    var data = "";
    res.setEncoding('utf8');
    res.on('data', function(chunk) {
      data += chunk;
    });

    res.on('end', function() {
      //console.log(data);
    });
  });

  post_request.on('error', function (e) {
    console.log(e);
    console.log("%j", postoptions);
  });

  //console.log(util.format(setdevstatus.body, light.id, capability, value));

  post_request.write(util.format(setdevstatus.body, light.id, capability, value));
  post_request.end();
}

//need to promisify this so it returns
WeMoNG.prototype.parseEvent = function parseEvent(evt) {
  var msg = {};
  msg.raw = evt;

  var def = Q.defer();

  xml2js.parseString(evt, function(err, res){
    if (!err) {
      var prop = res['e:propertyset']['e:property'][0];
      if (prop.hasOwnProperty('StatusChange')) {
        xml2js.parseString(prop['StatusChange'][0], function(err, res){
          if (!err && res != null) {
            msg.id = res['StateEvent']['DeviceID'][0]['_'];
            msg.capability = res['StateEvent']['CapabilityId'][0];
            msg.value = res['StateEvent']['Value'][0];
            def.resolve(msg);
          }
        });
      } else if (prop.hasOwnProperty('BinaryState')) {
        msg.state = prop['BinaryState'][0];
        if (msg.state.length > 1) {
          var parts = msg.state.split('|');
          msg.state = parts[0];
          msg.power = parts[7]/1000;
        }

        def.resolve(msg);
      } else {
        console.log("unhandled wemo event type \n%s", util.inspect(prop, {depth:null}));
      }
    } else {
      //error
    }
  }); 

  return def.promise;
}


// Based on https://github.com/theycallmeswift/hue.js/blob/master/lib/helpers.js
// TODO: Needs to be tweaked for more accurate color representation
WeMoNG.prototype.rgb2xy = function rgb2xy(red, green, blue) {
  var xyz;
  var rgb = [red / 255, green / 255, blue / 255];

  for (var i = 0; i < 3; i++) {
    if (rgb[i] > 0.04045) {
      rgb[i] = Math.pow(((rgb[i] + 0.055) / 1.055), 2.4);
    } else {
      rgb[i] /= 12.92;
    }
    rgb[i] = rgb[i] * 100;
  }

  xyz = [
    rgb[0] * 0.4124 + rgb[1] * 0.3576 + rgb[2] * 0.1805,
    rgb[0] * 0.2126 + rgb[1] * 0.7152 + rgb[2] * 0.0722,
    rgb[0] * 0.0193 + rgb[1] * 0.1192 + rgb[2] * 0.9505
  ];

  return [
    xyz[0] / (xyz[0] + xyz[1] + xyz[2]) * 65535,
    xyz[1] / (xyz[0] + xyz[1] + xyz[2]) * 65535
  ];
};

module.exports  = WeMoNG;