Pair Programming Completed

src/Main.java

@@ -6,81 +6,85 @@
 
 public class Main {
     public static void main(String[] args) {
+
+        // create scanner and get the csv file from the user
         Scanner s = new Scanner(System.in);
 
         System.out.print("Enter the CSV filename: ");
-        String f = s.nextLine();
-
-        List<Map<String, String>> dta = new ArrayList<>();
-        try (Scanner fs = new Scanner(new File(f))) {
-            fs.nextLine();
-
-            while (fs.hasNextLine()) {
-                String[] v = fs.nextLine().split(",");
-
-                int chg = Integer.parseInt(v[2]);  
+        //String f = s.nextLine();
 
-                Map<String, String> mp1 = new HashMap<>();
-                mp1.put("id", v[0]);  
-                mp1.put("tm", v[1]);  
-                mp1.put("chg", String.valueOf(chg));
-                dta.add(mp1);
-            }
-        } catch (FileNotFoundException e) {
-            System.out.println("Error reading the file: " + e.getMessage());
-            s.close();
-            return;
-        }
+        List<Map<String, String>> data = parseCSV(s.nextLine());
 
+
+        // creates new map containing the lists of maps with the same id
         Map<String, List<Map<String, String>>> mp2 = new HashMap<>();
-        for (Map<String, String> d : dta) {
+        // loops through list of maps
+        for (Map<String, String> d : data) {
+            //Saves id into a string from d 
             String id = d.get("id");
+            //Creates a new list map called lst and gets the key value
             List<Map<String, String>> lst = mp2.get(id);
+            // if there isn't a lst, it create the list
             if (lst == null) {
                 lst = new ArrayList<>();
+                // adds the list into the map
                 mp2.put(id, lst);
             }
+            // adds the data
             lst.add(d);
         }
-        int cnt = mp2.size();
 
-        System.out.println("There are " + cnt + " forks available (fork1 to fork" + cnt + ").");
+        // gets count of forks and displays to user
+        int count = mp2.size();
+
+        System.out.println("There are " + count + " forks available (fork1 to fork" + count + ").");
         System.out.print("Enter the fork number to analyze (or 'all' for all forks): ");
-        String inp = s.nextLine();
-
-        List<Map<String, String>> sel;
-        if (inp.equalsIgnoreCase("all")) {
-            sel = dta;
-        } else {
-            String id = "fork" + inp; 
-            sel = mp2.get(id);
+        String input = s.nextLine();
+
+        // creates a list of maps for the selection (all of the forks)
+        List<Map<String, String>> selection;
+
+        // if user picks "all" get all the data
+        if (input.equalsIgnoreCase("all")) {
+            selection = data;
+        } 
+        // otherwise select the fork from the id
+        else {
+            String id = "fork" + input; 
+            selection = mp2.get(id);
         }
 
-        int sz = sel.size();
+        // finding number of commits
+        int size = selection.size();
 
+        // find latest commit
         DateTimeFormatter f1 = DateTimeFormatter.ISO_DATE_TIME;
-        LocalDateTime lat = null;
-        for (Map<String, String> d : sel) {
+        LocalDateTime latestCommit = null;
+        for (Map<String, String> d : selection) {
             LocalDateTime t = LocalDateTime.parse(d.get("tm"), f1); 
-            if (lat == null || t.isAfter(lat)) {
-                lat = t;
+            if (latestCommit == null || t.isAfter(latestCommit)) {
+                latestCommit = t;
             }
         }
+
+        // formatting time and date
         DateTimeFormatter f2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
-        String latT = lat.format(f2);
-
-        double tot = 0.0;
-        int tlc = 0;
-        for (Map<String, String> d : sel) {
-            int lc = Integer.parseInt(d.get("chg"));
-            tot += lc;
-            tlc += lc;
+        String latT = latestCommit.format(f2);
+
+        // get average changes
+        double totalChangesDouble = 0.0;
+        int totalChangesInt = 0;
+        for (Map<String, String> d : selection) {
+            int latestChange = Integer.parseInt(d.get("chg"));
+            totalChangesDouble += latestChange;
+            totalChangesInt += latestChange;
         }
-        double avg = tot / sz;
+        double avg = totalChangesDouble / size;
 
+        // getting minimum and maximum number of commits total
         int mx = Integer.MIN_VALUE;
         int mn = Integer.MAX_VALUE;
-        for (Map<String, String> d : sel) {
+        for (Map<String, String> d : selection) {
             int chg = Integer.parseInt(d.get("chg"));
             if (chg > mx) {
                 mx = chg;
@@ -90,14 +94,46 @@ public static void main(String[] args) {
             }
         }
 
+        // printing out information
         System.out.println("\nStatistics:");
-        System.out.println("Number of commits: " + sz);
+        System.out.println("Number of commits: " + size);
         System.out.println("Most recent commit timestamp: " + latT);
         System.out.printf("Average lines changed per commit: %.2f\n", avg);
-        System.out.println("Total lines changed across all commits: " + tlc);
+        System.out.println("Total lines changed across all commits: " + totalChangesInt);
         System.out.println("Max lines changed in a commit: " + mx);
         System.out.println("Min lines changed in a commit: " + mn);
 
         s.close();
     }
+
+    public static List<Map<String, String>> parseCSV(String filename){
+         // create a list of maps called dta
+         List<Map<String, String>> data = new ArrayList<>();
+
+         // iterate through the csv file
+         try (Scanner fs = new Scanner(new File(filename))) {
+             fs.nextLine();
+
+             while (fs.hasNextLine()) {
+                 //split each line by comma and put in string array
+                 String[] v = fs.nextLine().split(",");
+
+                 // get the integer from the 3rd position in the line
+                 int chg = Integer.parseInt(v[2]);  
+
+                 // each map is a line in the file
+                 // add map line to the list
+                 Map<String, String> lineMap = new HashMap<>();
+                 lineMap.put("id", v[0]);  
+                 lineMap.put("tm", v[1]);  
+                 lineMap.put("chg", String.valueOf(chg));
+                 data.add(lineMap);
+             }
+         } catch (FileNotFoundException e) {
+             System.out.println("Error reading the file: " + e.getMessage());
+             return null;
+         }
+         return data; 
+
+    }
 }