Iris: Add chat in lectures

src/main/java/de/tum/cit/aet/artemis/iris/domain/session/IrisLectureChatSession.java

@@ -0,0 +1,44 @@
+package de.tum.cit.aet.artemis.iris.domain.session;
+
+import java.util.Optional;
+
+import jakarta.persistence.DiscriminatorValue;
+import jakarta.persistence.Entity;
+import jakarta.persistence.ManyToOne;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonInclude;
+
+import de.tum.cit.aet.artemis.core.domain.User;
+import de.tum.cit.aet.artemis.lecture.domain.Lecture;
+
+@Entity
+@DiscriminatorValue("LECTURE_CHAT")
+@JsonInclude(JsonInclude.Include.NON_EMPTY)
+public class IrisLectureChatSession extends IrisChatSession {
+
+    @ManyToOne
+    @JsonIgnore
+    private Lecture lecture;
+
+    public IrisLectureChatSession() {
+    }
+
+    public IrisLectureChatSession(Lecture lecture, User user) {
+        super(user);
+        this.lecture = lecture;
+    }
+
+    public Lecture getLecture() {
+        return lecture;
+    }
+
+    public void setLecture(Lecture lecture) {
+        this.lecture = lecture;
+    }
+
+    @Override
+    public String toString() {
+        return "IrisLectureChatSession{" + "user=" + Optional.ofNullable(getUser()).map(User::getLogin).orElse("null") + ", lecture=" + lecture + '}';
+    }
+}

src/main/java/de/tum/cit/aet/artemis/iris/domain/session/IrisSession.java

@@ -40,6 +40,7 @@
 @JsonSubTypes({
     @JsonSubTypes.Type(value = IrisExerciseChatSession.class, name = "chat"), // TODO: Legacy. Should ideally be "exercise_chat"
     @JsonSubTypes.Type(value = IrisCourseChatSession.class, name = "course_chat"),
+    @JsonSubTypes.Type(value = IrisLectureChatSession.class, name = "lecture_chat"),
 })
 // @formatter:on
 @JsonInclude(JsonInclude.Include.NON_EMPTY)

src/main/java/de/tum/cit/aet/artemis/iris/domain/settings/IrisCourseSettings.java

@@ -40,6 +40,10 @@ public class IrisCourseSettings extends IrisSettings {
     @JoinColumn(name = "iris_lecture_ingestion_settings_id")
     private IrisLectureIngestionSubSettings irisLectureIngestionSettings;
 
+    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
+    @JoinColumn(name = "iris_lecture_chat_settings_id")
+    private IrisLectureChatSubSettings irisLectureChatSettings;
+
     @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER, optional = false)
     @JoinColumn(name = "iris_competency_generation_settings_id")
     private IrisCompetencyGenerationSubSettings irisCompetencyGenerationSettings;
@@ -82,6 +86,16 @@ public void setIrisTextExerciseChatSettings(IrisTextExerciseChatSubSettings iris
         this.irisTextExerciseChatSettings = irisTextExerciseChatSettings;
     }
 
+    @Override
+    public IrisLectureChatSubSettings getIrisLectureChatSettings() {
+        return irisLectureChatSettings;
+    }
+
+    @Override
+    public void setIrisLectureChatSettings(IrisLectureChatSubSettings irisLectureChatSettings) {
+        this.irisLectureChatSettings = irisLectureChatSettings;
+    }
+
     @Override
     public IrisCourseChatSubSettings getIrisCourseChatSettings() {
         return irisCourseChatSettings;

src/main/java/de/tum/cit/aet/artemis/iris/domain/settings/IrisExerciseSettings.java

@@ -49,6 +49,16 @@ public IrisLectureIngestionSubSettings getIrisLectureIngestionSettings() {
     public void setIrisLectureIngestionSettings(IrisLectureIngestionSubSettings irisLectureIngestionSettings) {
     }
 
+    @Override
+    public IrisLectureChatSubSettings getIrisLectureChatSettings() {
+        return null;
+    }
+
+    @Override
+    public void setIrisLectureChatSettings(IrisLectureChatSubSettings irisLectureChatSettings) {
+        // Empty because exercises don't have lecture chat settings
+    }
+
     @Override
     public IrisChatSubSettings getIrisChatSettings() {
         return irisChatSettings;

src/main/java/de/tum/cit/aet/artemis/iris/domain/settings/IrisGlobalSettings.java

@@ -35,6 +35,10 @@ public class IrisGlobalSettings extends IrisSettings {
     @JoinColumn(name = "iris_lecture_ingestion_settings_id")
     private IrisLectureIngestionSubSettings irisLectureIngestionSettings;
 
+    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
+    @JoinColumn(name = "iris_lecture_chat_settings_id")
+    private IrisLectureChatSubSettings irisLectureChatSettings;
+
     @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER, optional = false)
     @JoinColumn(name = "iris_competency_generation_settings_id")
     private IrisCompetencyGenerationSubSettings irisCompetencyGenerationSettings;
@@ -69,6 +73,16 @@ public void setIrisTextExerciseChatSettings(IrisTextExerciseChatSubSettings iris
         this.irisTextExerciseChatSettings = irisTextExerciseChatSettings;
     }
 
+    @Override
+    public IrisLectureChatSubSettings getIrisLectureChatSettings() {
+        return irisLectureChatSettings;
+    }
+
+    @Override
+    public void setIrisLectureChatSettings(IrisLectureChatSubSettings irisLectureChatSettings) {
+        this.irisLectureChatSettings = irisLectureChatSettings;
+    }
+
     @Override
     public IrisCourseChatSubSettings getIrisCourseChatSettings() {
         return irisCourseChatSettings;

src/main/java/de/tum/cit/aet/artemis/iris/domain/settings/IrisLectureChatSubSettings.java

@@ -0,0 +1,72 @@
+package de.tum.cit.aet.artemis.iris.domain.settings;
+
+import java.util.SortedSet;
+import java.util.TreeSet;
+
+import jakarta.annotation.Nullable;
+import jakarta.persistence.Column;
+import jakarta.persistence.Convert;
+import jakarta.persistence.DiscriminatorValue;
+import jakarta.persistence.Entity;
+import jakarta.validation.constraints.Min;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+
+/**
+ * An {@link IrisSubSettings} implementation for the settings for the chat in a text exercise.
+ */
+@Entity
+@DiscriminatorValue("LECTURE_CHAT")
+@JsonInclude(JsonInclude.Include.NON_EMPTY)
+public class IrisLectureChatSubSettings extends IrisSubSettings {
+
+    /**
+     * Maximum number of messages allowed within the specified timeframe.
+     * Must be a positive integer or null to disable rate limiting.
+     */
+    @Nullable
+    @Min(1)
+    @Column(name = "rate_limit")
+    private Integer rateLimit;
+
+    /**
+     * Timeframe in hours for the rate limit.
+     * Must be a positive integer when rate limit is set.
+     */
+    @Nullable
+    @Min(1)
+    @Column(name = "rate_limit_timeframe_hours")
+    private Integer rateLimitTimeframeHours;
+
+    @Nullable
+    @Column(name = "enabled_for_categories")
+    @Convert(converter = IrisListConverter.class)
+    private SortedSet<String> enabledForCategories = new TreeSet<>();
+
+    @Nullable
+    public Integer getRateLimit() {
+        return rateLimit;
+    }
+
+    public void setRateLimit(@Nullable Integer rateLimit) {
+        this.rateLimit = rateLimit;
+    }
+
+    @Nullable
+    public Integer getRateLimitTimeframeHours() {
+        return rateLimitTimeframeHours;
+    }
+
+    public void setRateLimitTimeframeHours(@Nullable Integer rateLimitTimeframeHours) {
+        this.rateLimitTimeframeHours = rateLimitTimeframeHours;
+    }
+
+    @Nullable
+    public SortedSet<String> getEnabledForCategories() {
+        return enabledForCategories;
+    }
+
+    public void setEnabledForCategories(@Nullable SortedSet<String> enabledForCategories) {
+        this.enabledForCategories = enabledForCategories;
+    }
+}

src/main/java/de/tum/cit/aet/artemis/iris/domain/settings/IrisSettings.java

@@ -35,7 +35,7 @@
 @JsonSubTypes({
     @JsonSubTypes.Type(value = IrisGlobalSettings.class, name = "global"),
     @JsonSubTypes.Type(value = IrisCourseSettings.class, name = "course"),
-    @JsonSubTypes.Type(value = IrisExerciseSettings.class, name = "exercise")
+    @JsonSubTypes.Type(value = IrisExerciseSettings.class, name = "exercise"),
 })
 // @formatter:on
 @JsonInclude(JsonInclude.Include.NON_EMPTY)
@@ -57,6 +57,10 @@ public abstract class IrisSettings extends DomainObject {
 
     public abstract void setIrisLectureIngestionSettings(IrisLectureIngestionSubSettings irisLectureIngestionSettings);
 
+    public abstract IrisLectureChatSubSettings getIrisLectureChatSettings();
+
+    public abstract void setIrisLectureChatSettings(IrisLectureChatSubSettings irisLectureChatSettings);
+
     public abstract IrisCompetencyGenerationSubSettings getIrisCompetencyGenerationSettings();
 
     public abstract void setIrisCompetencyGenerationSettings(IrisCompetencyGenerationSubSettings irisCompetencyGenerationSubSettings);

src/main/java/de/tum/cit/aet/artemis/iris/domain/settings/IrisSubSettings.java

@@ -42,7 +42,8 @@
     @JsonSubTypes.Type(value = IrisTextExerciseChatSubSettings.class, name = "text-exercise-chat"),
     @JsonSubTypes.Type(value = IrisCourseChatSubSettings.class, name = "course-chat"),
     @JsonSubTypes.Type(value = IrisLectureIngestionSubSettings.class, name = "lecture-ingestion"),
-    @JsonSubTypes.Type(value = IrisCompetencyGenerationSubSettings.class, name = "competency-generation")
+    @JsonSubTypes.Type(value = IrisCompetencyGenerationSubSettings.class, name = "competency-generation"),
+    @JsonSubTypes.Type(value = IrisLectureChatSubSettings.class, name = "lecture-chat")
 })
 // @formatter:on
 @JsonInclude(JsonInclude.Include.NON_EMPTY)

src/main/java/de/tum/cit/aet/artemis/iris/domain/settings/IrisSubSettingsType.java

@@ -2,5 +2,5 @@
 
 public enum IrisSubSettingsType {
     CHAT, // TODO: Rename to PROGRAMMING_EXERCISE_CHAT
-    TEXT_EXERCISE_CHAT, COURSE_CHAT, COMPETENCY_GENERATION, LECTURE_INGESTION
+    TEXT_EXERCISE_CHAT, COURSE_CHAT, COMPETENCY_GENERATION, LECTURE_INGESTION, LECTURE_CHAT
 }

src/main/java/de/tum/cit/aet/artemis/iris/dto/IrisCombinedLectureChatSubSettingsDTO.java

@@ -0,0 +1,8 @@
+package de.tum.cit.aet.artemis.iris.dto;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+
+@JsonInclude(JsonInclude.Include.NON_EMPTY)
+public record IrisCombinedLectureChatSubSettingsDTO(boolean enabled, Integer rateLimit, Integer rateLimitTimeframeHours) {
+
+}

src/main/java/de/tum/cit/aet/artemis/iris/dto/IrisCombinedSettingsDTO.java

@@ -9,6 +9,7 @@ public record IrisCombinedSettingsDTO(
         IrisCombinedTextExerciseChatSubSettingsDTO irisTextExerciseChatSettings,
         IrisCombinedCourseChatSubSettingsDTO irisCourseChatSettings,
         IrisCombinedLectureIngestionSubSettingsDTO irisLectureIngestionSettings,
-        IrisCombinedCompetencyGenerationSubSettingsDTO irisCompetencyGenerationSettings
+        IrisCombinedCompetencyGenerationSubSettingsDTO irisCompetencyGenerationSettings,
+        IrisCombinedLectureChatSubSettingsDTO irisLectureChatSettings
 ) {}
 // @formatter:on

src/main/java/de/tum/cit/aet/artemis/iris/repository/IrisLectureChatSessionRepository.java

@@ -0,0 +1,47 @@
+package de.tum.cit.aet.artemis.iris.repository;
+
+import static de.tum.cit.aet.artemis.core.config.Constants.PROFILE_IRIS;
+import static org.springframework.data.jpa.repository.EntityGraph.EntityGraphType.LOAD;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.springframework.context.annotation.Profile;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.jpa.repository.EntityGraph;
+import org.springframework.stereotype.Repository;
+
+import de.tum.cit.aet.artemis.core.domain.DomainObject;
+import de.tum.cit.aet.artemis.core.repository.base.ArtemisJpaRepository;
+import de.tum.cit.aet.artemis.iris.domain.session.IrisLectureChatSession;
+
+@Repository
+@Profile(PROFILE_IRIS)
+public interface IrisLectureChatSessionRepository extends ArtemisJpaRepository<IrisLectureChatSession, Long> {
+
+    List<IrisLectureChatSession> findByLectureIdAndUserIdOrderByCreationDateDesc(Long lectureId, Long userId);
+
+    List<IrisLectureChatSession> findByLectureIdAndUserIdOrderByCreationDateDesc(Long lectureId, Long userId, Pageable pageable);
+
+    @EntityGraph(type = LOAD, attributePaths = "messages")
+    List<IrisLectureChatSession> findSessionsWithMessagesByIdIn(List<Long> ids);
+
+    /**
+     * Finds the latest chat sessions by lecture ID and user ID, including their messages, with pagination support.
+     * This method avoids in-memory paging by retrieving the session IDs directly from the database.
+     *
+     * @param lectureId the ID of the lecture to find the chat sessions for
+     * @param userId    the ID of the user to find the chat sessions for
+     * @param pageable  the pagination information
+     * @return a list of {@code IrisLectureChatSession} with messages, or an empty list if no sessions are found
+     */
+    default List<IrisLectureChatSession> findLatestSessionsByLectureIdAndUserIdWithMessages(Long lectureId, Long userId, Pageable pageable) {
+        List<Long> ids = findByLectureIdAndUserIdOrderByCreationDateDesc(lectureId, userId, pageable).stream().map(DomainObject::getId).toList();
+
+        if (ids.isEmpty()) {
+            return Collections.emptyList();
+        }
+
+        return findSessionsWithMessagesByIdIn(ids);
+    }
+}

src/main/java/de/tum/cit/aet/artemis/iris/repository/IrisSettingsRepository.java

@@ -31,6 +31,7 @@ public interface IrisSettingsRepository extends ArtemisJpaRepository<IrisSetting
                 LEFT JOIN FETCH irisSettings.irisTextExerciseChatSettings
                 LEFT JOIN FETCH irisSettings.irisLectureIngestionSettings
                 LEFT JOIN FETCH irisSettings.irisCompetencyGenerationSettings
+                LEFT JOIN FETCH irisSettings.irisLectureChatSettings
             """)
     Set<IrisGlobalSettings> findAllGlobalSettings();
 
@@ -45,6 +46,7 @@ default IrisGlobalSettings findGlobalSettingsElseThrow() {
                 LEFT JOIN FETCH irisSettings.irisTextExerciseChatSettings
                 LEFT JOIN FETCH irisSettings.irisLectureIngestionSettings
                 LEFT JOIN FETCH irisSettings.irisCompetencyGenerationSettings
+                LEFT JOIN FETCH irisSettings.irisLectureChatSettings
             WHERE irisSettings.course.id = :courseId
             """)
     Optional<IrisCourseSettings> findCourseSettings(@Param("courseId") long courseId);

src/main/java/de/tum/cit/aet/artemis/iris/service/IrisSessionService.java

@@ -14,11 +14,13 @@
 import de.tum.cit.aet.artemis.iris.domain.message.IrisMessage;
 import de.tum.cit.aet.artemis.iris.domain.session.IrisCourseChatSession;
 import de.tum.cit.aet.artemis.iris.domain.session.IrisExerciseChatSession;
+import de.tum.cit.aet.artemis.iris.domain.session.IrisLectureChatSession;
 import de.tum.cit.aet.artemis.iris.domain.session.IrisSession;
 import de.tum.cit.aet.artemis.iris.domain.session.IrisTextExerciseChatSession;
 import de.tum.cit.aet.artemis.iris.service.session.IrisChatBasedFeatureInterface;
 import de.tum.cit.aet.artemis.iris.service.session.IrisCourseChatSessionService;
 import de.tum.cit.aet.artemis.iris.service.session.IrisExerciseChatSessionService;
+import de.tum.cit.aet.artemis.iris.service.session.IrisLectureChatSessionService;
 import de.tum.cit.aet.artemis.iris.service.session.IrisRateLimitedFeatureInterface;
 import de.tum.cit.aet.artemis.iris.service.session.IrisSubFeatureInterface;
 import de.tum.cit.aet.artemis.iris.service.session.IrisTextExerciseChatSessionService;
@@ -38,12 +40,16 @@ public class IrisSessionService {
 
     private final IrisCourseChatSessionService irisCourseChatSessionService;
 
+    private final IrisLectureChatSessionService irisLectureChatSessionService;
+
     public IrisSessionService(UserRepository userRepository, IrisTextExerciseChatSessionService irisTextExerciseChatSessionService,
-            IrisExerciseChatSessionService irisExerciseChatSessionService, IrisCourseChatSessionService irisCourseChatSessionService) {
+            IrisExerciseChatSessionService irisExerciseChatSessionService, IrisCourseChatSessionService irisCourseChatSessionService,
+            IrisLectureChatSessionService irisLectureChatSessionService) {
         this.userRepository = userRepository;
         this.irisTextExerciseChatSessionService = irisTextExerciseChatSessionService;
         this.irisExerciseChatSessionService = irisExerciseChatSessionService;
         this.irisCourseChatSessionService = irisCourseChatSessionService;
+        this.irisLectureChatSessionService = irisLectureChatSessionService;
     }
 
     /**
@@ -139,6 +145,7 @@ private <S extends IrisSession> IrisSubFeatureWrapper<S> getIrisSessionSubServic
             case IrisTextExerciseChatSession chatSession -> (IrisSubFeatureWrapper<S>) new IrisSubFeatureWrapper<>(irisTextExerciseChatSessionService, chatSession);
             case IrisExerciseChatSession chatSession -> (IrisSubFeatureWrapper<S>) new IrisSubFeatureWrapper<>(irisExerciseChatSessionService, chatSession);
             case IrisCourseChatSession courseChatSession -> (IrisSubFeatureWrapper<S>) new IrisSubFeatureWrapper<>(irisCourseChatSessionService, courseChatSession);
+            case IrisLectureChatSession lectureChatSession -> (IrisSubFeatureWrapper<S>) new IrisSubFeatureWrapper<>(irisLectureChatSessionService, lectureChatSession);
             case null, default -> throw new BadRequestException("Unknown Iris session type " + session.getClass().getSimpleName());
         };
     }