func mint(
    ctx context.Context,
    wallet *tonWallet.Wallet,
    api ton.APIClientWrapped,
    collectionAddr *address.Address,
    owner *address.Address,
) (*address.Address, int64, error) {
    collectionClient := nft.NewCollectionClient(api, collectionAddr)
    collectionData, err := collectionClient.GetCollectionData(ctx)
    if err != nil {
        return nil, 0, fmt.Errorf("GetCollectionData: %w", err)
    }

    if collectionData.NextItemIndex.Int64() > max {
        return nil, collectionData.NextItemIndex.Int64(), nil
    }

    nftAddr, err := collectionClient.GetNFTAddressByIndex(ctx, collectionData.NextItemIndex)
    if err != nil {
        return nil, 0, fmt.Errorf("GetNFTAddressByIndex: %w", err)
    }

    mintData, err := collectionClient.BuildMintPayload(
        collectionData.NextItemIndex,
        owner,
        tlb.MustFromTON("0.01"),
        &nft.ContentOffchain{
            URI: fmt.Sprint(collectionData.NextItemIndex) + ".json",
        },
    )
    if err != nil {
        return nil, 0, fmt.Errorf("BuildMintPayload: %w", err)
    }

    mintMsg := tonWallet.SimpleMessage(collectionAddr, tlb.MustFromTON("0.025"), mintData)
    if err := wallet.Send(ctx, mintMsg, true); err != nil {
        return nil, 0, fmt.Errorf("Send: %w", err)
    }

    // Additional check
    // itemClient := nft.NewItemClient(api, nftAddr)
    // newData, err := retry.WithValueTon(ctx, func() (*nft.ItemData, error) {
    //  d, err := itemClient.GetNFTData(ctx)
    //  if err != nil {
    //      return nil, err
    //  }
    //  if d == nil {
    //      return nil, fmt.Errorf("nil")
    //  }
    //  return d, nil
    // })
    // if err != nil {
    //  return nil, fmt.Errorf("GetNFTData: %w", err)
    // }
    // if newData.Index != collectionData.NextItemIndex {
    //  panic("not minted")
    // }

    return nftAddr, collectionData.NextItemIndex.Int64(), nil
}