#4 Implement Relative Placement

 /**
  * Created by Techniv on 30/11/2016.
+ * @module relative_placement
  */
 (function (define) {
-    // TODO define exhaustive module platform
     module.exports = define();
 })(function(){
 
     /**
-     *
+     * @name RelativePlacement
      * @constructor
      * @property {Candidate[]} candidateList
-     * @property {String[]} votes
+     * @property {String[][]} votes
      * @property {Number} numberOfCandidates
      *
      */
@@ -29,6 +29,7 @@
      * @this RelativePlacement
      */
     RelativePlacement.prototype.addCandidate = function addCandidate(candidateName){
+        if(this.votes.length) throw new Error("Adding candidates after votes is not permit.");
         if(this.candidateList[candidateName]) throw new Error('"' +candidateName+ '" already exist in candidate list.');
         this.candidateList[candidateName] = new Candidate(candidateName);
     };
@@ -74,23 +75,106 @@
         }
     };
     RelativePlacement.prototype.addVotes = function () {};
-    RelativePlacement.prototype.getResult = function () {};
+    RelativePlacement.prototype.getResult = function () {
+        return relativePlacement(this.votes, this.candidateList);
+    };
 
     /**
      *
-     * @param name
+     * @param {String} name
      * @constructor
      * @property {String} name
      * @property {Number[]} votes
      * @property {Number[]} placements
+     * @property {Number[]} cumulativePlacement
      */
     function Candidate(name) {
         Object.defineProperties(this, {
-            name:       {value: name,   enumerable: true},
-            votes:      {value:[],      enumerable: true},
-            placements: {value:[],      enumerable: true, writable: true}
+            name:                   {value: name,   enumerable: true},
+            votes:                  {value:[],      enumerable: true},
+            placements:             {value:[],      enumerable: true, writable: true},
+            cumulativePlacement:    {value:[],      enumerable: true, writable: true}
+        });
+    }
+
+    /**
+     * @name relativePlacement
+     * @memberOf RelativePlacement
+     * @static
+     * @param {String[][]} votes
+     * @param {Object<String,Candidate>} [candidates]
+     * @returns {String[]}
+     */
+    function relativePlacement(votes, candidates){
+        if(votes.length <= 1) return votes[0];
+
+        // Prepare candidate list if not pass
+        var init = false, majority, result, candidateNames;
+        if(!candidates) {
+            candidates = {};
+            init = true;
+        }
+        candidateNames = votes[0];
+        majority = Math.floor(votes.length / 2) + 1;
+        result = [];
+
+        candidateNames.forEach((name) => {
+            if(init) candidates[name] = new Candidate(name);
+            candidates[name].placements[candidateNames.length-1] = 0;
+            candidates[name].placements.fill(0,0,candidateNames.length-1);
+            candidates[name].cumulativePlacement[candidateNames.length-1] = 0;
+            candidates[name].cumulativePlacement.fill(0,0,candidateNames.length-1);
         });
+
+        // Assign votes
+        votes.forEach((vote,num) => {
+            vote.forEach((name, place) => {
+                var candidate = candidates[name];
+                candidate.votes[num] = place;
+                for(let i = place; i < candidate.placements.length; i++){
+                    candidate.placements[i]++;
+                    candidate.cumulativePlacement[i] += place + 1;
+                }
+            });
+        });
+
+        // Search placement
+        var cursor = 0, nextPlace = 0, proposed = [];
+        while(result.length < candidateNames.length && cursor < candidateNames.length){
+
+            // Search majority
+            candidateNames.forEach(name => {
+                if(result.indexOf(name) != -1) return;
+                var candidate = candidates[name];
+                if(candidate.placements[cursor] >= majority) proposed.push(candidate);
+            });
+
+            if(proposed.length){
+                proposed.sort((a,b) => {
+                    var sortCursor = cursor;
+                    while(sortCursor < candidateNames.length){
+                        if(a.placements[sortCursor] != b.placements[sortCursor])
+                            return b.placements[sortCursor] - a.placements[sortCursor];
+                        if(a.cumulativePlacement[sortCursor] != b.cumulativePlacement[sortCursor])
+                            return a.cumulativePlacement[sortCursor] - b.cumulativePlacement[sortCursor];
+
+                        sortCursor++;
+                    }
+                    return 0;
+                });
+                result = result.concat(proposed.map(candidate => candidate.name));
+                cursor = result.length;
+                proposed.splice(0);
+                continue;
+            }
+
+            cursor++;
+        }
+
+
+        return result;
     }
 
+    RelativePlacement.relativePlacement = relativePlacement;
     return RelativePlacement;
 });
\ No newline at end of file

@@ -33,7 +33,8 @@ describe('RelativePlacement global', () => {
             assert.deepEqual({
                 name: 'foo',
                 votes:[],
-                placements: []
+                placements: [],
+                cumulativePlacement: []
             }, election.candidateList['foo']);
         });
 
@@ -45,12 +46,14 @@ describe('RelativePlacement global', () => {
             assert.deepEqual({
                 name: 'foo',
                 votes:[],
-                placements: []
+                placements: [],
+                cumulativePlacement: []
             }, election.candidateList['foo']);
             assert.deepEqual({
                 name: 'bar',
                 votes:[],
-                placements: []
+                placements: [],
+                cumulativePlacement: []
             }, election.candidateList['bar']);
         });
 

@@ -2,16 +2,12 @@
  * Created by Techniv on 02/12/2016.
  */
 var assert = require('assert');
-var RelativePlacement = require('../../relative-placement');
+/** @type RelativePlacement.relativePlacement */
+var relativePlacement = require('../../relative-placement').relativePlacement;
 /** @var {TestData[]} */
 var testDataList = require('./results_data.json');
 describe('RelativePlacement algo', () => {
 
-    var election;
-
-    beforeEach(()=>{
-        election = new RelativePlacement();
-    });
 
     describe('Process result data',() => {
 
@@ -22,14 +18,11 @@ describe('RelativePlacement algo', () => {
              */
             (testData,id) => {
                 it('#'+id+': '+(testData.comment||''), ()=>{
-                    election.addCandidates(testData.result.concat().sort(()=>Math.random()-Math.random()));
                     var votes = compileVotes(testData);
 
-                    votes.forEach((vote) => {
-                        election.addVote(vote);
-                    });
+                    var result = relativePlacement(votes);
 
-                    assert.deepEqual(election.getResult(), testData.result);
+                    assert.deepEqual(result, testData.result);
                 });
             }
         );

@@ -9,6 +9,18 @@
     "result": ["A","B","C"]
   },
   {
+    "comment": "boogiebythebay.org study case",
+    "votes":{
+      "Couple 1":[1,1,3,2,3],
+      "Couple 2":[6,5,4,1,2],
+      "Couple 3":[2,4,1,5,5],
+      "Couple 4":[4,2,5,6,6],
+      "Couple 5":[5,6,2,3,4],
+      "Couple 6":[3,3,6,4,1]
+    },
+    "result": ["Couple 1","Couple 6","Couple 3","Couple 2","Couple 5","Couple 4"]
+  },
+  {
     "comment": "Novice Strictly final",
     "votes":{
       "320": [1,1,1,1,1],