refactored some math into a library, and also implemented volunteer n…

…eeds prediction (very naievely)

vendor/showmath.js

@@ -0,0 +1,78 @@
+exports.init = function(ddoc) {
+  var _ = require("vendor/underscore")
+
+  function avg(doc) {
+    doc.avg = 0;
+    doc.perfd = 0;
+    for(var i=0,_len=doc.shows.length; i < _len; ++i) {
+      if (typeof doc.shows[i].count !== "undefined" && doc.shows[i].count !== null){
+        doc.avg = doc.avg + doc.shows[i].count;
+        doc.perfd = doc.perfd + 1
+      }
+      doc.shows[i].idx = i
+
+      doc.shows[i].time = ddoc.data.slots[doc.shows[i].slot]
+    }
+
+    if (doc.perfd == 0){
+      doc.avg = "None"
+      doc.latest = "None"
+      doc.perfd = "None"
+    } else {
+      doc.avg = doc.avg/doc.perfd
+      doc.latest = doc.shows[doc.perfd-1].count
+    }
+
+    return doc;
+  }
+
+  function guess(doc) {
+    if(typeof doc.perfd === "undefined") {
+      doc = avg(doc)
+    }
+    var venue = _.detect(ddoc.data.venues["by-name"],function(v){return v.name==doc.venue})
+    var counts = _.detect(ddoc.data.venues.counts,function(v){return v.short==venue.short})
+
+    var needs = {"side":counts["side-min"],"box":counts["box-min"],"usher":counts["ush-min"]}
+
+    if(doc.perfd === "None" ) {
+      return needs;
+    }
+    if(doc.avg >= (venue.capacity*0.4)) {
+      needs = addVol(needs,counts);
+    }
+    if(doc.avg >= (venue.capacity*0.5)) {
+      needs = addVol(needs,counts);
+    }
+    if(doc.avg >= (venue.capacity*0.6)) {
+      needs = addVol(needs,counts);
+    }
+    if(doc.avg >= (venue.capacity*0.7)) {
+      needs = addVol(needs,counts);
+    }
+    return needs;
+  }
+
+  function addVol(current,counts) {
+    if ((current["side"]===counts["side-max"])&&(current["box"]===counts["box-max"])&&(current["usher"]===counts["ush-max"])) {
+      return current;
+    }
+    if (current["box"] !== counts["box-max"]) {
+      current.box++;
+      return current
+    }
+    if (current["side"] !== counts["side-max"]) {
+      current.side++;
+      return current
+    }
+    if (current["usher"] !== counts["ush-max"]) {
+      current.ush++;
+      return current
+    }
+  }
+
+  return {
+    "avg": avg,
+    "guess":guess
+  }
+}