MetaLab/internal/controller/post_controller.go

package controller

import (
	"net/http"
	"strconv"

	"metazone.cc/metalab/internal/common"
	"metazone.cc/metalab/internal/model"

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

// PostController 帖子控制器（SSR 页面 + API）
type PostController struct {
	postService postUseCase
}

// NewPostController 构造函数
func NewPostController(ps postUseCase) *PostController {
	return &PostController{postService: ps}
}

// ListPage 帖子列表页
func (ctrl *PostController) ListPage(c *gin.Context) {
	keyword := c.Query("keyword")
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	posts, total, err := ctrl.postService.List(keyword, page, pageSize)
	if err != nil {
		c.HTML(http.StatusOK, "posts/index.html", common.BuildPageData(c, gin.H{
			"Title": "社区帖子",
			"Error": "加载帖子列表失败",
		}))
		return
	}

	if posts == nil {
		posts = []model.Post{}
	}

	p := common.Pagination{Page: page, PageSize: pageSize}
	p.DefaultPagination()
	totalPages := int((total + int64(p.PageSize) - 1) / int64(p.PageSize))
	prevPage := p.Page - 1
	if prevPage < 1 { prevPage = 1 }
	nextPage := p.Page + 1
	if nextPage > totalPages { nextPage = totalPages }

	c.HTML(http.StatusOK, "posts/index.html", common.BuildPageData(c, gin.H{
		"Title":      "社区帖子",
		"Posts":      posts,
		"Total":      total,
		"Page":       p.Page,
		"TotalPages": totalPages,
		"PrevPage":   prevPage,
		"NextPage":   nextPage,
		"Keyword":    keyword,
		"ExtraCSS":   "/static/css/posts.css",
	}))
}

// ShowPage 帖子详情页
func (ctrl *PostController) ShowPage(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.HTML(http.StatusNotFound, "posts/404.html", common.BuildPageData(c, gin.H{
			"Title": "未找到",
		}))
		return
	}

	post, err := ctrl.postService.GetByID(uint(id))
	if err != nil {
		c.HTML(http.StatusNotFound, "posts/404.html", common.BuildPageData(c, gin.H{
			"Title": "未找到",
		}))
		return
	}

	// 获取当前用户信息
	var uid uint
	var role string
	if uidObj, exists := c.Get("uid"); exists {
		uid, _ = uidObj.(uint)
	}
	if roleObj, exists := c.Get("role"); exists {
		role, _ = roleObj.(string)
	}

	// 仅 approved 公开可见（作者本人 + moderator+ 可预览其他状态）
	if post.Status != model.PostStatusApproved {
		isAuthor := uid == post.UserID
		isModerator := model.HasMinRole(role, model.RoleModerator)

		if !isAuthor && !isModerator {
			c.HTML(http.StatusNotFound, "posts/404.html", common.BuildPageData(c, gin.H{
				"Title": "未找到",
			}))
			return
		}
	}

	c.HTML(http.StatusOK, "posts/show.html", common.BuildPageData(c, gin.H{
		"Title":    post.Title,
		"Post":     post,
		"UID":      uid,
		"ExtraCSS": "/static/css/posts.css",
	}))
}

// NewPage 发帖页面
func (ctrl *PostController) NewPage(c *gin.Context) {
	c.HTML(http.StatusOK, "posts/new.html", common.BuildPageData(c, gin.H{
		"Title":    "撰写帖子",
		"ExtraCSS": "/static/css/posts.css",
		"ExtraJS":  "/static/js/editor.js",
	}))
}

// EditPage 编辑页面
func (ctrl *PostController) EditPage(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.HTML(http.StatusNotFound, "posts/404.html", common.BuildPageData(c, gin.H{
			"Title": "未找到",
		}))
		return
	}

	post, err := ctrl.postService.GetByID(uint(id))
	if err != nil || post.Status == model.PostStatusPending || post.Status == model.PostStatusLocked {
		c.HTML(http.StatusNotFound, "posts/404.html", common.BuildPageData(c, gin.H{
			"Title": "未找到或无法编辑",
		}))
		return
	}

	c.HTML(http.StatusOK, "posts/new.html", common.BuildPageData(c, gin.H{
		"Title":    "编辑帖子",
		"Post":     post,
		"ExtraCSS": "/static/css/posts.css",
		"ExtraJS":  "/static/js/editor.js",
	}))
}

// Create API 发帖
func (ctrl *PostController) Create(c *gin.Context) {
	uidObj, _ := c.Get("uid")
	uid, ok := uidObj.(uint)
	if !ok {
		common.Error(c, http.StatusUnauthorized, "请先登录")
		return
	}

	var req model.PostCreateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		common.Error(c, http.StatusBadRequest, "标题和正文不能为空")
		return
	}

	post, err := ctrl.postService.Create(uid, req.Title, req.Body)
	if err != nil {
		common.Error(c, http.StatusInternalServerError, "发帖失败")
		return
	}

	common.OkWithMessage(c, post, "发布成功")
}

// Update API 编辑帖子
func (ctrl *PostController) Update(c *gin.Context) {
	uidObj, _ := c.Get("uid")
	uid, _ := uidObj.(uint)

	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
		return
	}

	var req model.PostUpdateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		common.Error(c, http.StatusBadRequest, "标题和正文不能为空")
		return
	}

	// 权限检查：取帖子归属
	post, err := ctrl.postService.GetByID(uint(id))
	if err != nil {
		common.Error(c, http.StatusNotFound, "帖子不存在")
		return
	}
	roleObj, _ := c.Get("role")
	role, _ := roleObj.(string)
	if post.UserID != uid && !model.HasMinRole(role, model.RoleModerator) {
		common.Error(c, http.StatusForbidden, "无权编辑此帖子")
		return
	}

	if err := ctrl.postService.Update(uint(id), req.Title, req.Body); err != nil {
		common.Error(c, http.StatusBadRequest, err.Error())
		return
	}

	common.OkMessage(c, "编辑成功")
}

// Delete API 删除帖子
func (ctrl *PostController) Delete(c *gin.Context) {
	uidObj, _ := c.Get("uid")
	uid, _ := uidObj.(uint)

	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
		return
	}

	post, err := ctrl.postService.GetByID(uint(id))
	if err != nil {
		common.Error(c, http.StatusNotFound, "帖子不存在")
		return
	}

	roleObj, _ := c.Get("role")
	role, _ := roleObj.(string)
	if post.UserID != uid && !model.HasMinRole(role, model.RoleModerator) {
		common.Error(c, http.StatusForbidden, "无权删除此帖子")
		return
	}

	if err := ctrl.postService.Delete(uint(id)); err != nil {
		common.Error(c, http.StatusInternalServerError, "删除失败")
		return
	}

	common.OkMessage(c, "删除成功")
}

// Submit API 提交审核
func (ctrl *PostController) Submit(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
		return
	}

	if err := ctrl.postService.SubmitForAudit(uint(id)); err != nil {
		common.Error(c, http.StatusBadRequest, err.Error())
		return
	}

	common.OkMessage(c, "已提交审核")
}

// ListAPI 帖子列表 JSON API
func (ctrl *PostController) ListAPI(c *gin.Context) {
	keyword := c.Query("keyword")
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	posts, total, err := ctrl.postService.List(keyword, page, pageSize)
	if err != nil {
		common.Error(c, http.StatusInternalServerError, "获取帖子列表失败")
		return
	}

	if posts == nil {
		posts = []model.Post{}
	}

	p := common.Pagination{Page: page, PageSize: pageSize}
	p.DefaultPagination()
	totalPages := int((total + int64(p.PageSize) - 1) / int64(p.PageSize))

	common.Ok(c, model.PostListResult{
		Items:      posts,
		Total:      total,
		Page:       p.Page,
		TotalPages: totalPages,
	})
}

// ShowAPI 帖子详情 JSON API
func (ctrl *PostController) ShowAPI(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
		return
	}

	post, err := ctrl.postService.GetByID(uint(id))
	if err != nil {
		common.Error(c, http.StatusNotFound, "帖子不存在")
		return
	}

	common.Ok(c, post)
}

// PreviewAPI Markdown 预览 API
func (ctrl *PostController) PreviewAPI(c *gin.Context) {
	var req struct {
		Body string `json:"body" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		common.Error(c, http.StatusBadRequest, "正文不能为空")
		return
	}

	html, err := ctrl.postService.RenderMarkdown(req.Body)
	if err != nil {
		common.Error(c, http.StatusInternalServerError, "渲染失败")
		return
	}

	common.Ok(c, gin.H{"html": html})
}