added check for existing system config when a feature is enabled

abstracto-application/abstracto-modules/modmail/modmail-int/src/main/java/dev/sheldan/abstracto/modmail/config/ModMailFeature.java

@@ -3,6 +3,8 @@ package dev.sheldan.abstracto.modmail.config;
 import dev.sheldan.abstracto.core.config.FeatureConfig;
 import dev.sheldan.abstracto.core.config.FeatureEnum;
 import dev.sheldan.abstracto.core.config.PostTargetEnum;
+import dev.sheldan.abstracto.core.service.FeatureValidator;
+import dev.sheldan.abstracto.modmail.validator.ModMailFeatureValidator;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
@@ -12,6 +14,9 @@ import java.util.List;
 @Component
 public class ModMailFeature implements FeatureConfig {
 
+    @Autowired
+    private ModMailFeatureValidator modMailFeatureValidator;
+
     @Autowired
     private ModMailLoggingFeature modMailLoggingFeature;
 
@@ -29,4 +34,9 @@ public class ModMailFeature implements FeatureConfig {
     public List<PostTargetEnum> getRequiredPostTargets() {
         return Arrays.asList(ModMailPostTargets.MOD_MAIL_PING);
     }
+
+    @Override
+    public List<FeatureValidator> getAdditionalFeatureValidators() {
+        return Arrays.asList(modMailFeatureValidator);
+    }
 }

abstracto-application/abstracto-modules/modmail/modmail-int/src/main/java/dev/sheldan/abstracto/modmail/models/template/ModMailCategoryValidationError.java

@@ -0,0 +1,27 @@
+package dev.sheldan.abstracto.modmail.models.template;
+
+import dev.sheldan.abstracto.core.models.ValidationError;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.HashMap;
+
+@Getter
+@Setter
+@Builder
+public class ModMailCategoryValidationError implements ValidationError {
+    private Long currentCategoryId;
+
+    @Override
+    public String getTemplateName() {
+        return "modmail_category_not_setup";
+    }
+
+    @Override
+    public Object getTemplateModel() {
+        HashMap<String, Long> params = new HashMap<>();
+        params.put("categoryId", currentCategoryId);
+        return params;
+    }
+}

abstracto-application/abstracto-modules/modmail/modmail-int/src/main/java/dev/sheldan/abstracto/modmail/validator/ModMailFeatureValidator.java

@@ -0,0 +1,6 @@
+package dev.sheldan.abstracto.modmail.validator;
+
+import dev.sheldan.abstracto.core.service.FeatureValidator;
+
+public interface ModMailFeatureValidator extends FeatureValidator {
+}