package handler

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

	"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（首页右栏 / 公告页）
func (h *Handlers) AnnouncementsList(c *gin.Context) {
	list, err := h.Announcement.ListPublished(10)
	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)})
}

// AnnouncementDetail 已发布公告详情
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
	}
	c.JSON(http.StatusOK, gin.H{"announcement": a})
}

// ===== 管理接口（RequireAdmin 兜底，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})
}

// 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})
}