feat: add pagination to admin post list handler and service

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

handlers/posts.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/gofiber/fiber/v3"
 	"lmika.dev/lmika/weiro/models"
+	"lmika.dev/lmika/weiro/providers/db"
 	"lmika.dev/lmika/weiro/services/categories"
 	"lmika.dev/lmika/weiro/services/posts"
 )
@@ -18,22 +19,43 @@ type PostsHandler struct {
 func (ph PostsHandler) Index(c fiber.Ctx) error {
 	var req struct {
 		Filter string `query:"filter"`
+		Page   int    `query:"page"`
 	}
 	if err := c.Bind().Query(&req); err != nil {
 		return fiber.ErrBadRequest
 	}
 
-	posts, err := ph.PostService.ListPosts(c.Context(), req.Filter == "deleted")
+	const perPage = 25
+	if req.Page < 1 {
+		req.Page = 1
+	}
+
+	result, err := ph.PostService.ListPosts(c.Context(), req.Filter == "deleted", db.PagingParams{
+		Offset: int64((req.Page - 1) * perPage),
+		Limit:  perPage,
+	})
 	if err != nil {
 		return err
 	}
 
+	totalPages := int(result.TotalCount+int64(perPage)-1) / perPage
+	if totalPages < 1 {
+		totalPages = 1
+	}
+
+	pageInfo := models.PageInfo{
+		CurrentPage:  req.Page,
+		TotalPages:   totalPages,
+		PostsPerPage: perPage,
+	}
+
 	return accepts(c, json(func() any {
-		return posts
+		return result.Posts
 	}), html(func(c fiber.Ctx) error {
 		return c.Render("posts/index", fiber.Map{
-			"req":   req,
-			"posts": posts,
+			"req":      req,
+			"posts":    result.Posts,
+			"pageInfo": pageInfo,
 		})
 	}))
 }

services/posts/list.go

@@ -12,29 +12,36 @@ type PostWithCategories struct {
 	Categories []*models.Category
 }
 
-func (s *Service) ListPosts(ctx context.Context, showDeleted bool) ([]*PostWithCategories, error) {
+type ListPostsResult struct {
+	Posts      []*PostWithCategories
+	TotalCount int64
+}
+
+func (s *Service) ListPosts(ctx context.Context, showDeleted bool, paging db.PagingParams) (ListPostsResult, error) {
 	site, ok := models.GetSite(ctx)
 	if !ok {
-		return nil, models.SiteRequiredError
+		return ListPostsResult{}, models.SiteRequiredError
 	}
 
-	posts, err := s.db.SelectPostsOfSite(ctx, site.ID, showDeleted, db.PagingParams{
-		Offset: 0,
-		Limit:  25,
-	})
+	posts, err := s.db.SelectPostsOfSite(ctx, site.ID, showDeleted, paging)
 	if err != nil {
-		return nil, err
+		return ListPostsResult{}, err
+	}
+
+	count, err := s.db.CountPostsOfSite(ctx, site.ID, showDeleted)
+	if err != nil {
+		return ListPostsResult{}, err
 	}
 
 	result := make([]*PostWithCategories, len(posts))
 	for i, post := range posts {
 		cats, err := s.db.SelectCategoriesOfPost(ctx, post.ID)
 		if err != nil {
-			return nil, err
+			return ListPostsResult{}, err
 		}
 		result[i] = &PostWithCategories{Post: post, Categories: cats}
 	}
-	return result, nil
+	return ListPostsResult{Posts: result, TotalCount: count}, nil
 }
 
 func (s *Service) GetPost(ctx context.Context, pid int64) (*models.Post, error) {