backend/internal/handler/admin_post_handler.go

package handler

import (
	"strconv"

	"carrot_bbs/internal/dto"
	"carrot_bbs/internal/model"
	"carrot_bbs/internal/pkg/response"
	"carrot_bbs/internal/service"

	"github.com/gin-gonic/gin"
)

// AdminPostHandler 管理端帖子处理器
type AdminPostHandler struct {
	adminPostService service.AdminPostService
}

// NewAdminPostHandler 创建管理端帖子处理器
func NewAdminPostHandler(adminPostService service.AdminPostService) *AdminPostHandler {
	return &AdminPostHandler{
		adminPostService: adminPostService,
	}
}

// GetPostList 获取帖子列表
// GET /api/v1/admin/posts
func (h *AdminPostHandler) GetPostList(c *gin.Context) {
	// 解析分页参数
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	if page <= 0 {
		page = 1
	}
	if pageSize <= 0 || pageSize > 100 {
		pageSize = 20
	}

	// 获取筛选参数
	keyword := c.Query("keyword")
	status := c.Query("status")
	authorID := c.Query("author_id")
	startDate := c.Query("start_date")
	endDate := c.Query("end_date")

	// 验证状态参数
	if status != "" && status != string(model.PostStatusDraft) &&
		status != string(model.PostStatusPending) &&
		status != string(model.PostStatusPublished) &&
		status != string(model.PostStatusRejected) {
		response.BadRequest(c, "invalid status value")
		return
	}

	posts, total, err := h.adminPostService.GetPostList(c.Request.Context(), page, pageSize, keyword, status, authorID, startDate, endDate)
	if err != nil {
		response.InternalServerError(c, "failed to get post list")
		return
	}

	response.Paginated(c, posts, total, page, pageSize)
}

// GetPostDetail 获取帖子详情
// GET /api/v1/admin/posts/:id
func (h *AdminPostHandler) GetPostDetail(c *gin.Context) {
	postID := c.Param("id")
	if postID == "" {
		response.BadRequest(c, "post id is required")
		return
	}

	postDetail, err := h.adminPostService.GetPostDetail(c.Request.Context(), postID)
	if err != nil {
		response.NotFound(c, "post not found")
		return
	}

	response.Success(c, postDetail)
}

// DeletePost 删除帖子
// DELETE /api/v1/admin/posts/:id
func (h *AdminPostHandler) DeletePost(c *gin.Context) {
	postID := c.Param("id")
	if postID == "" {
		response.BadRequest(c, "post id is required")
		return
	}

	err := h.adminPostService.DeletePost(c.Request.Context(), postID)
	if err != nil {
		response.HandleError(c, err, "failed to delete post")
		return
	}

	response.Success(c, dto.SuccessResponse{
		Success: true,
		Message: "post deleted successfully",
	})
}

// ModeratePost 审核帖子
// PUT /api/v1/admin/posts/:id/moderate
func (h *AdminPostHandler) ModeratePost(c *gin.Context) {
	postID := c.Param("id")
	if postID == "" {
		response.BadRequest(c, "post id is required")
		return
	}

	var req dto.AdminModeratePostRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "invalid request body: "+err.Error())
		return
	}

	// 验证状态值
	if req.Status != string(model.PostStatusPublished) && req.Status != string(model.PostStatusRejected) {
		response.BadRequest(c, "invalid status value, must be 'published' or 'rejected'")
		return
	}

	// 获取当前用户ID作为审核人
	reviewedBy := c.GetString("user_id")

	postDetail, err := h.adminPostService.ModeratePost(c.Request.Context(), postID, model.PostStatus(req.Status), req.Reason, reviewedBy)
	if err != nil {
		response.HandleError(c, err, "failed to moderate post")
		return
	}

	response.Success(c, postDetail)
}

// BatchDeletePosts 批量删除帖子
// POST /api/v1/admin/posts/batch-delete
func (h *AdminPostHandler) BatchDeletePosts(c *gin.Context) {
	var req dto.AdminBatchDeletePostsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "invalid request body: "+err.Error())
		return
	}

	result, err := h.adminPostService.BatchDeletePosts(c.Request.Context(), req.IDs)
	if err != nil {
		response.InternalServerError(c, "failed to batch delete posts")
		return
	}

	response.Success(c, result)
}

// BatchModeratePosts 批量审核帖子
// POST /api/v1/admin/posts/batch-moderate
func (h *AdminPostHandler) BatchModeratePosts(c *gin.Context) {
	var req dto.AdminBatchModeratePostsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "invalid request body: "+err.Error())
		return
	}

	// 验证状态值
	if req.Status != string(model.PostStatusPublished) && req.Status != string(model.PostStatusRejected) {
		response.BadRequest(c, "invalid status value, must be 'published' or 'rejected'")
		return
	}

	// 获取当前用户ID作为审核人
	reviewedBy := c.GetString("user_id")

	result, err := h.adminPostService.BatchModeratePosts(c.Request.Context(), req.IDs, model.PostStatus(req.Status), reviewedBy)
	if err != nil {
		response.InternalServerError(c, "failed to batch moderate posts")
		return
	}

	response.Success(c, result)
}

// SetPostPin 置顶/取消置顶帖子
// PUT /api/v1/admin/posts/:id/pin
func (h *AdminPostHandler) SetPostPin(c *gin.Context) {
	postID := c.Param("id")
	if postID == "" {
		response.BadRequest(c, "post id is required")
		return
	}

	var req dto.AdminSetPostPinRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "invalid request body: "+err.Error())
		return
	}

	postDetail, err := h.adminPostService.SetPostPin(c.Request.Context(), postID, req.IsPinned)
	if err != nil {
		response.HandleError(c, err, "failed to set post pin status")
		return
	}

	response.Success(c, postDetail)
}

// SetPostFeature 加精/取消加精帖子
// PUT /api/v1/admin/posts/:id/feature
func (h *AdminPostHandler) SetPostFeature(c *gin.Context) {
	postID := c.Param("id")
	if postID == "" {
		response.BadRequest(c, "post id is required")
		return
	}

	var req dto.AdminSetPostFeatureRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "invalid request body: "+err.Error())
		return
	}

	postDetail, err := h.adminPostService.SetPostFeature(c.Request.Context(), postID, req.IsFeatured)
	if err != nil {
		response.HandleError(c, err, "failed to set post feature status")
		return
	}

	response.Success(c, postDetail)
}