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A Library for Polyglot Development of Ergo Applications

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package org.ergoplatform.appkit;

import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

import scala.Tuple2;
import sigma.Coll;

/**
 * EIP-29 Attachment containing list of EIP-29 attachments
 */
public class BoxAttachmentMulti extends BoxAttachmentGeneric {
    private final Tuple2>[] attachmentList;

    BoxAttachmentMulti(byte[] attachmentContent) {
        super(Type.MULTI_ATTACHMENT.toTypeRawValue(), attachmentContent);

        ErgoValue attachmentTuples = ErgoValue.fromHex(new String(attachmentContent, StandardCharsets.UTF_8));
        if (!attachmentTuples.getType().equals(ErgoType.collType(ErgoType.pairType(ErgoType.integerType(), ErgoType.collType(ErgoType.byteType()))))) {
            throw new IllegalArgumentException("Multi attachment content needs to be Coll[(Int, Coll[Byte])]");
        }

        attachmentList = (Tuple2[]) ((Coll) attachmentTuples.getValue()).toArray();
    }

    private BoxAttachmentMulti(byte[] attachmentContent, Tuple2>[] attachmentList) {
        super(Type.MULTI_ATTACHMENT.toTypeRawValue(), attachmentContent);
        this.attachmentList = attachmentList;
    }

    /**
     * @return i-th attachment of this multi attachment
     */
    public BoxAttachment getAttachment(int i) {
        return BoxAttachmentGeneric.createFromAttachmentTuple(attachmentList[i]);
    }

    /**
     * @return count of all attachments contained in this multi attachment
     */
    public int getAttachmentCount() {
        return attachmentList.length;
    }

    /**
     * @param attachments list of attachments to include in a multi attachment
     * @return object representing a multi attachment
     */
    public static BoxAttachmentMulti buildForList(List attachments) {
        List>> attachmentTuples = new ArrayList<>(attachments.size());
        for (BoxAttachment attachment : attachments) {
            attachmentTuples.add(attachment.getErgoValue().getValue()._2);
        }
        Tuple2>[] tupleArray = attachmentTuples.toArray(new Tuple2[]{});
        ErgoValue>>> ergoValue = ErgoValue.of(tupleArray, ErgoType.pairType(ErgoType.integerType(), ErgoType.collType(ErgoType.byteType())));

        return new BoxAttachmentMulti(ergoValue.toHex().getBytes(StandardCharsets.UTF_8), tupleArray);
    }
}