/**
 * package api
 * 作用：附件管理相关API处理器
 */
package api

import (
	"strconv"
	"xk-websocket-v2/internal/model"
	"xk-websocket-v2/internal/service"
	"xk-websocket-v2/internal/utils"

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

/**
 * UploadAttachmentHandler
 * 功能：上传附件
 * 路径：POST /api/attachments/upload
 */
func UploadAttachmentHandler(c *gin.Context) {
	userID, _ := c.Get("user_id")

	// 获取文件
	file, err := c.FormFile("file")
	if err != nil {
		utils.BadRequest(c, "文件上传失败: "+err.Error())
		return
	}

	// 获取文件类型
	fileType := c.PostForm("type")
	if fileType == "" {
		// 根据文件扩展名推断类型
		ext := file.Filename[len(file.Filename)-4:]
		if ext == ".jpg" || ext == ".png" || ext == ".gif" || ext == "webp" || ext == "jpeg" {
			fileType = "image"
		} else {
			fileType = "video"
		}
	}

	// 验证文件类型
	if fileType != "image" && fileType != "video" {
		utils.BadRequest(c, "文件类型必须是image或video")
		return
	}

	// 验证文件大小
	if fileType == "image" && file.Size > model.MaxImageSize {
		utils.BadRequest(c, "图片大小不能超过10MB")
		return
	}
	if fileType == "video" && file.Size > model.MaxVideoSize {
		utils.BadRequest(c, "视频大小不能超过500MB")
		return
	}

	// 打开文件
	src, err := file.Open()
	if err != nil {
		utils.BadRequest(c, "打开文件失败: "+err.Error())
		return
	}
	defer src.Close()

	// 上传文件
	attachment, err := service.AttachmentSvc.UploadFile(
		userID.(string),
		file.Filename,
		fileType,
		file.Size,
		src,
	)
	if err != nil {
		utils.BadRequest(c, err.Error())
		return
	}

	utils.SuccessWithData(c, attachment, "上传成功")
}

/**
 * GetAttachmentHandler
 * 功能：获取附件信息
 * 路径：GET /api/attachments/:id
 */
func GetAttachmentHandler(c *gin.Context) {
	attachmentID, _ := strconv.ParseUint(c.Param("id"), 10, 32)

	attachment, err := service.AttachmentSvc.GetAttachment(uint(attachmentID))
	if err != nil {
		utils.NotFound(c, "附件不存在")
		return
	}

	utils.SuccessWithData(c, attachment, "获取成功")
}

/**
 * DeleteAttachmentHandler
 * 功能：删除附件（仅上传者可删除）
 * 路径：DELETE /api/attachments/:id
 */
func DeleteAttachmentHandler(c *gin.Context) {
	userID, _ := c.Get("user_id")
	attachmentID, _ := strconv.ParseUint(c.Param("id"), 10, 32)

	if err := service.AttachmentSvc.DeleteAttachment(uint(attachmentID), userID.(string)); err != nil {
		utils.BadRequest(c, err.Error())
		return
	}

	utils.Success(c, "附件已删除")
}

/**
 * GetAttachmentsHandler
 * 功能：获取附件列表
 * 路径：GET /api/attachments
 */
func GetAttachmentsHandler(c *gin.Context) {
	userID, _ := c.Get("user_id")
	fileType := c.Query("type")
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

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

	attachments, total, err := service.AttachmentSvc.GetUserAttachments(userID.(string), fileType, page, pageSize)
	if err != nil {
		utils.InternalError(c, "查询失败")
		return
	}

	// 确保返回空数组而不是null
	if attachments == nil {
		attachments = []model.Attachment{}
	}

	utils.SuccessWithData(c, gin.H{
		"data":  attachments,
		"total": total,
		"page":  page,
		"size":  pageSize,
	}, "获取成功")
}