/* package whatever; // don't place package name! */
 
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
 
class SSE2CohortPredictor {
 
      private static final double UNSIGNED_16_MAX = Math.pow(2, 16);
      private static final String COHORT_SALT = "ADVANCE_PAYMENT_COHORT_OPEN_RATE";
      private static final String SSE2_SALT = "SUPER_SAVER_EMI_2";
 
      public static void main(String[] args) {
          // ========== QA: CHANGE THESE VALUES ==========
          String loanId = "69125";
          int cohortOpenRate = 10;   // CMS: ADVANCE_PAYMENT_COHORT_OPEN_RATE
          int sse2OpenRate = 50;     // CMS: SSE_V2_OPEN_RATE
          // =============================================
 
          double cohortSplit = getSplit(COHORT_SALT, loanId);
          boolean isTestGroup = cohortSplit < (cohortOpenRate / 100.0);
 
          System.out.println("============================================================");
          System.out.println("Loan ID          : " + loanId);
          System.out.println("Cohort Split     : " + cohortSplit);
          System.out.println("Cohort Open Rate : " + cohortOpenRate + "%");
          System.out.println("Cohort Group     : " + (isTestGroup ? "TEST" : "CONTROL"));
          System.out.println("============================================================");
 
          if (!isTestGroup) {
              System.out.println("Result           : SSE1 (COHORT CONTROL group)");
              return;
          }
 
          double sse2Split = getSplit(SSE2_SALT, loanId);
          boolean isSse2 = sse2Split < (sse2OpenRate / 100.0);
 
          System.out.println("SSE2 Split       : " + sse2Split);
          System.out.println("SSE2 Open Rate   : " + sse2OpenRate + "%");
          System.out.println("SSE2 Eligible    : " + (isSse2 ? "YES" : "NO"));
          System.out.println("Result           : " + (isSse2 ? "SSE2" : "SSE1 (TEST but not SSE2 eligible)"));
      }
 
      private static double getSplit(String salt, String uniqueId) {
          try {
              byte[] hash = MessageDigest.getInstance("SHA-256").digest((uniqueId + salt).getBytes());
              int value = ((hash[0] & 0xFF) << 8) | (hash[1] & 0xFF);
              return value / UNSIGNED_16_MAX;
          } catch (NoSuchAlgorithmException e) {
              throw new RuntimeException(e);
          }
      }
  }

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