/***********************************************************************************

    Abstractor | Generic node | MIT License | ©2016 Hexagon <github.com/hexagon>

    Converts a regular function to a abstractor node.

    ----------------------------------------------------------------------------


    Options

    -----------------+-----------------+----------------------+-----------------
    Option           |  Type           |  Default             |  Mandatory
    -----------------+-----------------+----------------------+-----------------
    path             |  string         |  undefined           |  yes
    encoding         |  string         |  utf8                |  yes
    mode             |  string         |  0o666               |  yes
    flag             |  string         |  a                   |  yes
    -----------------+-----------------+----------------------+-----------------


    I/O

    -------------------------------+----------------------+---------------------
    Input                          |  Possible triggers   |  Sets property
    -------------------------------+----------------------+---------------------
                                   |  success             |  <none>
    payload: <string/buffer>       +----------------------+---------------------
                                   |  error               |  error
    -------------------------------+----------------------+---------------------


***********************************************************************************/
"use strict";

const   Node = require("../node.js");

class Generic extends Node {

    invoke(msg) {

        var self = this;
        
        // Supplied function accepts one argument (should be message, handle as syncronous)
        if ( this.config.fn  ) {

            // We will push two extra arguments onto the stack
            arguments.length += 2;

            // Push success callback onto arguments
            arguments[arguments.length-2] = function(msg) { if( self.config.block !== true ) { self.trigger("success", msg); } };

            // Push error callback onto arguments
            arguments[arguments.length-1] = function(msg) { if( self.config.block !== true ) { self.trigger("success", msg); } };

            // Invoke general function. Did it return something? Instant success!
            var returned = this.config.fn.apply(this, arguments);
            if ( returned !== undefined ) {
                if( self.config.block !== true ) { self.trigger("success", returned); }
            }

        } else {
            // No function was provided, just pass the message onto next node
            if( this.config.block !== true ) {
                this.trigger("success", msg );  
            }
            
        }
        
    }

}

module.exports = Generic;