dev add method link

src/main/java/ru/soune/nocopy/service/user/UserSpecifications.java

@@ -0,0 +1,59 @@
+package ru.soune.nocopy.service.user;
+
+import org.springframework.data.jpa.domain.Specification;
+import ru.soune.nocopy.entity.user.SubscriptionType;
+import ru.soune.nocopy.entity.user.User;
+
+import java.time.LocalDate;
+
+public class UserSpecifications {
+
+    public static Specification<User> byFullName(String fullName) {
+        return (root, query, cb) -> {
+            if (fullName == null || fullName.isEmpty()) return null;
+            return cb.like(cb.lower(root.get("fullName")), "%" + fullName.toLowerCase() + "%");
+        };
+    }
+
+    public static Specification<User> byEmail(String email) {
+        return (root, query, cb) -> {
+            if (email == null || email.isEmpty()) return null;
+            return cb.like(cb.lower(root.get("email")), "%" + email.toLowerCase() + "%");
+        };
+    }
+
+    public static Specification<User> byIsActive(Boolean isActive) {
+        return (root, query, cb) -> {
+            if (isActive == null) return null;
+            return cb.equal(root.get("isActive"), isActive);
+        };
+    }
+
+    public static Specification<User> byEmailVerified(Boolean emailVerified) {
+        return (root, query, cb) -> {
+            if (emailVerified == null) return null;
+            return cb.equal(root.get("emailVerified"), emailVerified);
+        };
+    }
+
+    public static Specification<User> bySubscriptionType(SubscriptionType type) {
+        return (root, query, cb) -> {
+            if (type == null) return null;
+            return cb.equal(root.get("subscriptionType"), type);
+        };
+    }
+
+    public static Specification<User> byCreatedAtRange(LocalDate from, LocalDate to) {
+        return (root, query, cb) -> {
+            if (from == null && to == null) return null;
+            if (from != null && to != null) {
+                return cb.between(root.get("createdAt"),
+                        from.atStartOfDay(), to.atTime(23, 59, 59));
+            } else if (from != null) {
+                return cb.greaterThanOrEqualTo(root.get("createdAt"), from.atStartOfDay());
+            } else {
+                return cb.lessThanOrEqualTo(root.get("createdAt"), to.atTime(23, 59, 59));
+            }
+        };
+    }
+}