/**
  * window-opener
  * Simply wrapper for the core window.open function that ensures the opened window is 
  * the size you actually asked for in the first place.
  * 
  * Many browsers handle the sizing differently, and usually you dont get all your viewport in view
  */
 (function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory()
  : typeof define === 'function' && define.amd ? define(factory)
  : global.windowOpener = factory();
}(this, (function () { 'use strict';

    const nativeOpen = window.open;
    const api = {

    /**
      * Open a new window and ensure it is the size you actually asked for in the first place
      */
    open:function (...args) {

      // open the window with native method, proxying all args
      const win = nativeOpen.apply(window, args);

        const features = {};

        if(args[2]) {
          // parse the features list
          args[2].split(',').forEach( kv => {
            var k, v;
            [k, v] = kv.split('=');
            features[k]=v;
          });
        }

        // If we had a width or height, then set those again when the window is open
        if(features.width || features.height) {
          
          win.addEventListener('load', () => {
            const deltaX = features.width ? parseInt(features.width) - win.innerWidth : 0;
            const deltaY = features.height ? parseInt(features.height) - win.innerHeight : 0;
            win.resizeBy(deltaX, deltaY); 
          }, {
            once:true
          });

        }
      

        return win;
    },

    /**
      * By default window.open is wrapped and replaced by open
      * If you want to restore the original window.open function then call
      * windowOpener.unWrap();
      * 
      */
    unWrap : function () {
      window.open = nativeOpen; 
    },

    /**
      * Wrap the native window.open method with open, to fix
      * sizing issues
      */
    wrap : function() {
      window.open = api.open; 
    }
  };

    
  return api;

})));