package handler

import (
	"errors"
	"net/http"
	"strconv"

	"github.com/freefire/jiang13-bbs/markdown"
	"github.com/freefire/jiang13-bbs/middleware"
	"github.com/freefire/jiang13-bbs/model"
	"github.com/freefire/jiang13-bbs/service"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// ===== 公开接口 =====

// AnnouncementsList 已发布公告列表（分页：page/size，默认 size=20）
func (h *Handlers) AnnouncementsList(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
	list, total, err := h.Announcement.ListPublishedPage(page, size)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取公告失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"announcements": nonNilSlice(list),
		"total":         total,
		"page":          page,
	})
}

// AnnouncementDetail 已发布公告详情（按读者能力脱敏 [hide]）
func (h *Handlers) AnnouncementDetail(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的公告 ID"})
		return
	}
	a, err := h.Announcement.GetPublished(uint(id))
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusNotFound, gin.H{"error": "公告不存在"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取公告失败"})
		return
	}
	caps := markdown.ViewerCaps{}
	if claims := middleware.CurrentUser(c); claims != nil {
		caps.LoggedIn = true
		if model.RoleLevel(model.Role(claims.Role)) >= model.RoleLevel(model.RoleAdmin) {
			caps.Bypass = true
		}
	}
	// 公告不可评论：回复块若有残留也永不解锁（保存期已拒收）
	sanitized, _ := markdown.SanitizeForViewer(a.Content, caps)
	out := *a
	out.Content = sanitized
	c.JSON(http.StatusOK, gin.H{"announcement": out})
}

// ===== 管理接口（RequireStaff + PermAnnouncements，前端不做权限判定） =====

// AdminListAnnouncements 全部公告（含草稿）
func (h *Handlers) AdminListAnnouncements(c *gin.Context) {
	list, err := h.Announcement.ListAll()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取公告失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"announcements": nonNilSlice(list)})
}

// AdminCreateAnnouncement 新建公告
func (h *Handlers) AdminCreateAnnouncement(c *gin.Context) {
	var in service.AnnouncementInput
	if err := c.ShouldBindJSON(&in); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
		return
	}
	a, err := h.Announcement.Create(&in)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusCreated, gin.H{"announcement": a})
}

// AdminUpdateAnnouncement 编辑公告
func (h *Handlers) AdminUpdateAnnouncement(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的公告 ID"})
		return
	}
	var in service.AnnouncementInput
	if err := c.ShouldBindJSON(&in); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
		return
	}
	a, err := h.Announcement.Update(uint(id), &in)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusNotFound, gin.H{"error": "公告不存在"})
			return
		}
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"announcement": a})
}

// AdminToggleAnnouncementPin 切换公告置顶
func (h *Handlers) AdminToggleAnnouncementPin(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的公告 ID"})
		return
	}
	a, err := h.Announcement.TogglePin(uint(id))
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusNotFound, gin.H{"error": "公告不存在"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "更新失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"announcement": a})
}

// AdminDeleteAnnouncement 删除公告
func (h *Handlers) AdminDeleteAnnouncement(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的公告 ID"})
		return
	}
	if err := h.Announcement.Delete(uint(id)); err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			c.JSON(http.StatusNotFound, gin.H{"error": "公告不存在"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"ok": true})
}