package agent

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

	"ycc-server/app/main/api/internal/svc"
	"ycc-server/app/main/api/internal/types"
	"ycc-server/app/main/model"
	"ycc-server/common/ctxdata"
	"ycc-server/common/xerr"

	"github.com/pkg/errors"
	"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,
	}
}

// GetInvitePoster 使用 ImageService（invitation 类型，yq_qrcode_1.png + 二维码）生成海报
func (l *GetInvitePosterLogic) GetInvitePoster(req *types.GetInvitePosterReq) (pngBytes []byte, err error) {
	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)
	}

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

	pngBytes, _, err = l.svcCtx.ImageService.ProcessImageWithQRCode("invitation", inviteLink)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "生成邀请海报失败: %v", err)
	}

	return pngBytes, nil
}

// GetInvitePosterBase64 返回 base64 字符串，供前端 data URL 使用
func (l *GetInvitePosterLogic) GetInvitePosterBase64(req *types.GetInvitePosterReq) (string, error) {
	pngBytes, err := l.GetInvitePoster(req)
	if err != nil {
		return "", err
	}
	return base64.StdEncoding.EncodeToString(pngBytes), nil
}