Add comment functionality.

server/service/comment.go

@@ -0,0 +1,53 @@
+package service
+
+import (
+	"github.com/gofiber/fiber/v3/log"
+	"nysoure/server/dao"
+	"nysoure/server/model"
+)
+
+func CreateComment(content string, userID uint, resourceID uint) (*model.CommentView, error) {
+	resourceExists, err := dao.ExistsResource(resourceID)
+	if err != nil {
+		log.Error("Error checking resource existence:", err)
+		return nil, model.NewInternalServerError("Error checking resource existence")
+	}
+	if !resourceExists {
+		return nil, model.NewNotFoundError("Resource not found")
+	}
+	userExists, err := dao.ExistsUserByID(userID)
+	if err != nil {
+		log.Error("Error checking user existence:", err)
+		return nil, model.NewInternalServerError("Error checking user existence")
+	}
+	if !userExists {
+		return nil, model.NewNotFoundError("User not found")
+	}
+	c, err := dao.CreateComment(content, userID, resourceID)
+	if err != nil {
+		log.Error("Error creating comment:", err)
+		return nil, model.NewInternalServerError("Error creating comment")
+	}
+	return c.ToView(), nil
+}
+
+func ListComments(resourceID uint, page int) ([]model.CommentView, int, error) {
+	resourceExists, err := dao.ExistsResource(resourceID)
+	if err != nil {
+		log.Error("Error checking resource existence:", err)
+		return nil, 0, model.NewInternalServerError("Error checking resource existence")
+	}
+	if !resourceExists {
+		return nil, 0, model.NewNotFoundError("Resource not found")
+	}
+	comments, totalPages, err := dao.GetCommentByResourceID(resourceID, page, pageSize)
+	if err != nil {
+		log.Error("Error getting comments:", err)
+		return nil, 0, model.NewInternalServerError("Error getting comments")
+	}
+	res := make([]model.CommentView, 0, len(comments))
+	for _, c := range comments {
+		res = append(res, *c.ToView())
+	}
+	return res, totalPages, nil
+}