module.exports = function(RED) {
  "use strict";

  function CCUConfigNode(n) {
    RED.nodes.createNode(this, n);
    this.host = n.host;
    this.interfaceName = n.interfaceName;
  }

  RED.nodes.registerType("ccu-address", CCUConfigNode);

  function DeviceConfigNode(n) {
    RED.nodes.createNode(this, n);
    this.channel = n.channel;
  }

  RED.nodes.registerType("homematic-device", DeviceConfigNode);

  function HomematicCommands(n) {
    RED.nodes.createNode(this, n);
    const node = this;
    this.ccu = n.ccu;
    this.device = n.device;
    this.config = RED.nodes.getNode(this.ccu);
    this.device = RED.nodes.getNode(this.device);
    this.function = n.function;
    this.attribute = n.attribute;
    this.value = n.value || "";
    this.nodeName = n.nodeName;

    this.prepareValue = function(value, msg) {
      let returnValue = value;
      // make sure that only this object is possible!
      if (value === "{{msg.payload}}") {
        returnValue = msg.payload;
      }
      return returnValue;
    };

    this.setValue = function(interfaceName, channel, attribute, value) {
      return (
        'var d = dom.GetObject("' +
        interfaceName +
        channel +
        "." +
        attribute +
        '");if (d){d.State("' +
        value +
        '");}'
      );
    };

    this.getValue = function(interfaceName, channel, attribute) {
      return (
        'var d = dom.GetObject("' +
        interfaceName +
        channel +
        "." +
        attribute +
        '");if (d){Write(d.State());}'
      );
    };

    this.on("input", msg => {
      let script = "";
      if (this.function == "setValue") {
        script = this.setValue(
          this.config.interfaceName,
          this.device.channel,
          this.attribute,
          this.prepareValue(this.value, msg)
        );
      }
      if (this.function == "getValue") {
        script = this.getValue(
          this.config.interfaceName,
          this.device.channel,
          this.attribute
        );
      }

      let headers = {};
      headers["Content-Length"] = script.length;
      headers["Content-Type"] = "application/x-www-form-urlencoded";

      msg.headers = headers;
      msg.method = "POST";
      msg.url = "http://" + this.config.host + "/tclrega.exe";
      msg.payload = script;

      this.send(msg);
    });
  }

  RED.nodes.registerType("homematic", HomematicCommands);
};