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api/controllers/commendations.js

@@ -0,0 +1,45 @@
+const commendation = require("../models/commendation");
+const user = require("../models/user");
+
+module.exports.saveCommendation = async (req, res) => {
+    try{
+        const {commenderId, commendedId, score} = req.body;
+
+        if(!commenderId)              return res.type('json').status(400).send("Commender id was not provided.");
+        if(!commendedId)              return res.type('json').status(400).send("Commended id was not provided.");
+        if(!score)                    return res.type('json').status(400).send("Score was not provided.");
+        if(score <= 0 || score > 10)  return res.type('json').status(400).send("Score must be >= 1 and <= 10");
+
+        // Make sure the person is not commending again
+        let foundCommendation = await commendation.findOne({$and: [{commendedId:commendedId}, {commenderId:commenderId}]}).exec();
+        if(foundCommendation) return res.type('json').status(400).send("You have already commended this user.");
+
+        // Compute average reputation of commended person
+        let totalReputation = score, totalNumOfCommends = 1, newReputation = 0;
+        const cursor = commendation.find({commendedId:commendedId}).cursor();
+        for (let commendation = await cursor.next(); commendation != null; commendation = await cursor.next()) {
+            totalReputation += commendation.score;
+            totalNumOfCommends += 1;
+        }
+        newReputation = Math.round(totalReputation/totalNumOfCommends);
+
+        // Save New Commendation
+        await new commendation({ 
+            commendedId: commendedId,
+            commenderId: commenderId,
+            score: score
+        }).save();
+       
+        // Update users reputation
+        const updatedUser = await user.findOneAndUpdate({_id: commendedId}, 
+                                                        {reputation:newReputation},
+                                                        {returnOriginal: false});
+
+        if(!updatedUser) return res.type('json').status(400).send("Commended user reputation could not be updated.");
+
+       return res.type('json').status(200).send();
+
+    }catch(err) {
+        return res.type('json').status(500).send(err.toString());   
+    }
+};