Feature/user statistics

src/main/java/application/user/UserStatistics.java

@@ -0,0 +1,34 @@
+package application.user;
+
+import domain.user.User;
+import java.util.ArrayList;
+import java.util.List;
+import persistence.DonationDao;
+
+public class UserStatistics {
+  private DonationDao donationDao;
+
+  public UserStatistics() {
+    this.donationDao = new DonationDao();
+  }
+
+  public List<String> userFavoriteOrganizations(User user) {
+    List<String> favoriteOrganizations = donationDao.getFavoriteOrganizations(user.getID());
+    return favoriteOrganizations;
+  }
+
+  public List<String> userDonations(User user) {
+    List<String> userDonationList = donationDao.getUserDonations(user.getID());
+    return userDonationList;
+  }
+
+  public String userTotalDonationAmount(User user) {
+    String totalDonations = donationDao.getTotalDonationAmount(user.getID());
+    return totalDonations;
+  }
+
+  public String getTotalDonationsMade(User user) {
+    String totalDonationsMade = donationDao.getTotalDonationsMade(user.getID());
+    return totalDonationsMade;
+  }
+}

src/main/java/persistence/DonationDao.java

@@ -88,6 +88,106 @@ public List<Donation> findByUser(long userId) {
     }
   }
 
+  public List<String> getUserDonations(long userId) {
+    String sql = """
+        SELECT amount, donation_date, organization_id
+        FROM donation
+        WHERE user_Id = ?
+        """;
+
+    try (Connection conn = Database.getConnection()) {
+      PreparedStatement stmt = conn.prepareStatement(sql);
+
+      stmt.setLong(1, userId);
+      ResultSet rs = stmt.executeQuery();
+      List<String> list = new ArrayList<>();
+      while (rs.next()) list.add(mapRowSimple(rs));
+      return list;
+    } catch (SQLException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  public List<String> getFavoriteOrganizations(long userId) {
+    String sql = """
+        SELECT organization_id, COUNT(*) AS donation_count
+        FROM donation
+        WHERE user_Id = ?
+        GROUP BY organization_id
+        ORDER BY donation_count DESC
+        LIMIT 3
+        """;
+
+    try (Connection conn = Database.getConnection()) {
+      PreparedStatement stmt = conn.prepareStatement(sql);
+
+      stmt.setLong(1, userId);
+      ResultSet rs = stmt.executeQuery();
+      List<String> list = new ArrayList<>();
+      while (rs.next()) list.add(mapRowFavorite(rs));
+      return list;
+    } catch (SQLException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  public String getTotalDonationAmount(long userId) {
+    String sql = """
+        SELECT SUM(CAST(amount as REAL)) 
+        FROM donation
+        WHERE user_id = ?
+        """;
+
+    try (Connection conn = Database.getConnection()) {
+      PreparedStatement stmt = conn.prepareStatement(sql);
+
+      stmt.setLong(1, userId);
+      ResultSet rs = stmt.executeQuery();
+      if (rs.next()) {
+        BigDecimal amount = rs.getBigDecimal(1);
+        return amount.toString();
+      }
+      return "0";
+    } catch (SQLException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  public String getTotalDonationsMade(long userId) {
+    String sql = """
+  SELECT COUNT(*)
+  FROM donation
+  WHERE user_id = ?
+  """;
+
+    try (Connection conn = Database.getConnection()) {
+      PreparedStatement stmt = conn.prepareStatement(sql);
+
+      stmt.setLong(1, userId);
+      ResultSet rs = stmt.executeQuery();
+      if (rs.next()) {
+        int amount = rs.getInt(1);
+        String s = String.valueOf(amount);
+        return s;
+      }
+      return "0";
+    } catch (SQLException e) {
+      throw new RuntimeException(e);
+    }
+
+  }
+
+  private String mapRowSimple(ResultSet rs) throws SQLException {
+    return "Amount: " + rs.getString("amount") +
+        ", Date: " + rs.getString("donation_date") +
+        ", Organization: " + rs.getString("organization_id");
+  }
+
+  private String mapRowFavorite(ResultSet rs) throws SQLException {
+    return rs.getString("organization_id")
+        + " (" + rs.getInt("donation_count") + " donasjoner)";
+  }
+