// myjs.js
// External Javascript working out things about how it was called, and acting accordingly
// RJM Programming - February, 2015

 // This type of syntax can be good with prearranged knowledge
 var myname = document.getElementById("jsid").getAttribute("data-name");
 var mysrc = document.getElementById("jsid").getAttribute("src").replace("myjs.js", "");
 
 // This other way can do it too, and we continue on to some generic get parameter processing
 var thenames = document.URL.split("?");
 var thesrc = "", thename = "", ii, iii, xx, zz, ww;
 var solution = 0, lastoperator = "*", first=1;
 var listofnumbers=['x0','x1','x2','x3','x4','x5','x6','x7','x8','x9','x_0','x_1','x_2','x_3','x_4','x_5','x_6','x_7','x_8','x_9'];
 var listofplaces=['Athens','Rome','New York','Moscow','Beijing','Bangkok','Jakarta','Sydney','Pretoria','Cairo'];
 var listofrivers=['Amazon','Murray','Congo','Rhine','Nile','Danube','Mekong','Mississippi','Ganges','Yangtze'];
 if (thenames.length > 1) {
   thename = thenames[0];
   thesrc = "?" + document.URL.replace(thename + "?", "");
   xx = thesrc.substring(1).split("=");
   for (ii=1; ii<xx.length; ii++) {
    ww=xx[ii - 1].split("&");
    zz=xx[ii].split("&");
    eval("var " + decodeURIComponent(ww[ww.length - 1]).replace(/ /g, "_") + "='" + decodeURIComponent(zz[0]) + "'");  // get params to var of that same name
    for (iii=0; iii<listofplaces.length; iii++) {
     if (eval("typeof(" + listofplaces[iii].replace(/ /g, "_") + ")") != "undefined" && (decodeURIComponent(ww[ww.length - 1]).replace(/ /g, "_") == decodeURIComponent(listofplaces[iii]).replace(/ /g, "_"))) {
      document.body.innerHTML=document.body.innerHTML + "<h1>" + "Hope it is good weather in " + decodeURIComponent(listofplaces[iii]).replace(/_/g, " ") + "</h1>";
      //alert("Hope it is good weather in " + decodeURIComponent(listofplaces[iii]).replace(/_/g, " "));
     }
    }
    for (iii=0; iii<listofrivers.length; iii++) {
     if (eval("typeof(" + listofrivers[iii].replace(/ /g, "_") + ")") != "undefined" && (decodeURIComponent(ww[ww.length - 1]).replace(/ /g, "_") == decodeURIComponent(listofrivers[iii]).replace(/ /g, "_"))) {
      document.body.innerHTML=document.body.innerHTML + "<h2>" + "Hope you catch a fish on the " + decodeURIComponent(listofrivers[iii]).replace(/_/g, " ") + " river" + "</h2>";
      //alert("Hope you catch a fish on the " + decodeURIComponent(listofrivers[iii]).replace(/_/g, " ") + " river");
     }
    }
    for (iii=0; iii<(listofnumbers.length / 2); iii++) {
     if (eval("typeof(x" + listofnumbers[iii].replace("x","") + ")") != "undefined" && (eval(decodeURIComponent(ww[ww.length - 1]).replace("x","").replace("_","-").replace(/ /g, "_")) == eval(iii))) {
      //alert(thesrc + " here at " + iii);
      if (first == 1) {
        solution = iii;
        lastoperator = eval("x" + iii);
      } else {
        solution = eval("(" + solution + ") " + lastoperator + " (" + iii + ")");
        lastoperator = eval("x" + iii);
      }
      first = 0;
     } else if (eval("typeof(x_" + listofnumbers[iii].replace("x","") + ")") != "undefined" && (eval(decodeURIComponent(ww[ww.length - 1]).replace("x","").replace("_","-").replace(/ /g, "_")) == eval(-iii))) {
      //alert(thesrc + " here at -" + iii);
      if (first == 1) {
        solution = -iii;
        lastoperator = eval("x_" + iii);
      } else {
        solution = eval("(" + solution + ") " + lastoperator + " (-" + iii + ")");
        lastoperator = eval("x_" + iii);
      }
      first = 0;
     }
    }
   }
 }
 
 if (first == 0) {
   //alert("Solution is " + solution); 
   document.body.innerHTML=document.body.innerHTML + "<h3>" + "Solution is " + solution + "</h3>";
 }