bdqr-server/app/main/api/internal/logic/agent/getinviteposterlogic.go

package agent

import (
	"context"
	"encoding/base64"
	"fmt"
	"strings"

	"bdqr-server/app/main/model"
	"bdqr-server/common/ctxdata"
	"bdqr-server/common/xerr"

	"github.com/pkg/errors"

	"bdqr-server/app/main/api/internal/svc"
	"bdqr-server/app/main/api/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
)

type GetInvitePosterLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewGetInvitePosterLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetInvitePosterLogic {
	return &GetInvitePosterLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *GetInvitePosterLogic) GetInvitePoster(req *types.GetInvitePosterReq) (resp *types.GetInvitePosterResp, err error) {
	// 1. 需登录且为代理
	userID, err := ctxdata.GetUidFromCtx(l.ctx)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "获取用户信息失败, %v", err)
	}

	_, err = l.svcCtx.AgentModel.FindOneByUserId(l.ctx, userID)
	if err != nil {
		if errors.Is(err, model.ErrNotFound) {
			return nil, errors.Wrapf(xerr.NewErrMsg("您不是代理"), "")
		}
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "查询代理信息失败, %v", err)
	}

	// 2. 邀请链接不能为空
	inviteLink := strings.TrimSpace(req.InviteLink)
	if inviteLink == "" {
		return nil, errors.Wrapf(xerr.NewErrMsg("邀请链接不能为空"), "")
	}

	// 3. 确定模板类型（1-4 对应 invitation_01 ~ invitation_04）
	templateIndex := req.TemplateIndex
	if templateIndex < 1 || templateIndex > 4 {
		templateIndex = 1
	}
	qrcodeType := fmt.Sprintf("invitation_%02d", templateIndex)

	// 4. 调用 ImageService 生成邀请海报（背景图 + 二维码）
	imgData, _, err := l.svcCtx.ImageService.ProcessImageWithQRCode(qrcodeType, inviteLink)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "生成海报失败: %v", err)
	}

	// 5. 返回 base64
	posterBase64 := base64.StdEncoding.EncodeToString(imgData)
	return &types.GetInvitePosterResp{
		PosterBase64: posterBase64,
	}, nil
}