// Package method 业务逻辑方法包，实现反馈相关的业务操作
package method

import (
	"context"
	"errors"
	"time"

	"bsm/full/module/base/feedback/internal/impl"
	"bsm/full/module/base/feedback/internal/models"
	pb "bsm/full/module/base/feedback/pb"
	"git.apinb.com/bsm-sdk/core/errcode"
	"git.apinb.com/bsm-sdk/core/service"
	"git.apinb.com/bsm-sdk/core/types"
	"git.apinb.com/bsm-sdk/core/utils"
	"git.apinb.com/bsm-sdk/core/vars"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

// Modify 修改反馈记录
// ctx: 上下文，包含用户认证信息
// in: 修改请求参数，包含记录ID和要修改的字段
// 返回: 修改操作结果
func Modify(ctx context.Context, in *pb.ModifyRequest) (reply *pb.StatusReply, err error) {
	// 解析用户认证信息
	auth, err := service.ParseMetaCtx(ctx, nil)
	if err != nil {
		return nil, err
	}

	// 验证请求参数
	if in.GetIdentity() == "" {
		return nil, errcode.ErrInvalidArgument
	}

	// 归属校验：仅本人或管理端可修改
	exist := new(models.FeedbackItem)
	if err = impl.DBService.Where("identity = ?", in.GetIdentity()).First(exist).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, errcode.ErrPermissionDenied
		}
		return nil, err
	}
	if !canAccess(auth, exist.PassportIdentity) {
		return nil, errcode.ErrPermissionDenied
	}

	// 构建更新字段：不改写 identity 与归属，避免记录"消失"或归属被转移
	record := &models.FeedbackItem{
		UserName: in.GetUserName(), // 用户名
		Email:    in.GetEmail(),    // 邮箱
		Phone:    in.GetPhone(),    // 手机号
		Status:   in.GetStatus(),   // 状态
		Title:    in.GetTitle(),    // 标题
		Content:  in.GetContent(),  // 内容
		Category: in.GetCategory(), // 分类
	}

	// 处理图片信息
	images := make([]models.FeedbackImage, 0, len(in.GetImages()))
	for _, v := range in.GetImages() {
		identity := v.GetIdentity()
		if identity == "" {
			identity = utils.UUID() // 生成新的图片ID
		}
		images = append(images, models.FeedbackImage{
			Std_IICUDS: types.Std_IICUDS{
				Identity: identity,
			},
			ItemIdentity: in.GetIdentity(), // 关联的反馈记录ID
			URL:          v.GetUrl(),       // 图片URL
		})
	}

	// 处理附件信息：子表 identity 为唯一索引，必须逐个赋值，否则多条附件必然唯一键冲突
	accessories := make([]models.FeedbackAccessory, 0, len(in.GetAccessories()))
	for _, v := range in.GetAccessories() {
		identity := v.GetIdentity()
		if identity == "" {
			identity = utils.UUID() // 生成新的附件ID
		}
		accessories = append(accessories, models.FeedbackAccessory{
			Std_IICUDS: types.Std_IICUDS{
				Identity: identity,
			},
			ItemIdentity: in.GetIdentity(), // 关联的反馈记录ID
			Title:        v.Title,          // 附件标题
			FilePath:     v.FilePath,       // 附件文件路径
		})
	}

	// 主表字段与子表重建放在同一事务内，任一步失败整体回滚
	err = impl.DBService.Transaction(func(tx *gorm.DB) error {
		// 只更新主表标量字段；Omit 关联后由下面显式重建子表，避免同一次修改写入两遍
		if err := tx.Model(&models.FeedbackItem{}).
			Where("identity = ?", in.GetIdentity()).
			Omit(clause.Associations).
			Updates(record).Error; err != nil {
			return err
		}

		// 先删除关联的图片和附件
		if err := tx.Where("item_identity = ?", in.GetIdentity()).Delete(&models.FeedbackImage{}).Error; err != nil {
			return err
		}
		if err := tx.Where("item_identity = ?", in.GetIdentity()).Delete(&models.FeedbackAccessory{}).Error; err != nil {
			return err
		}

		// 重新创建关联的图片和附件
		if len(images) > 0 {
			if err := tx.Create(&images).Error; err != nil {
				return err
			}
		}
		if len(accessories) > 0 {
			if err := tx.Create(&accessories).Error; err != nil {
				return err
			}
		}
		return nil
	})
	if err != nil {
		return nil, err
	}

	return &pb.StatusReply{
		Message: vars.OK,
		Timeseq: time.Now().UnixMilli(),
	}, nil
}