# All files / lib/messages CetAdaptorSignatures.ts

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     import { BufferReader, BufferWriter } from '@node-dlc/bufio';

    import { MessageType } from '../MessageType';
    import { IDlcMessage } from './DlcMessage';

    /**
     * CetAdaptorSignatures contains CET signatures and any necessary
     * information linking the signatures to their corresponding outcome
     */
    export class CetAdaptorSignatures implements IDlcMessage {
      public static type = MessageType.CetAdaptorSignatures;

      /**
       * Deserializes a cet_adaptor_signature message
       * @param buf
       */
      public static deserialize(buf: Buffer): CetAdaptorSignatures {
        const instance = new CetAdaptorSignatures();
        const reader = new BufferReader(buf);

        const nbSignatures = Number(reader.readBigSize()); // nb_signatures

        // Read exactly nbSignatures * (65 + 97) bytes to match serialize format
        for (let i = 0; i < nbSignatures; i++) {
          const encryptedSig = reader.readBytes(65);
          const dleqProof = reader.readBytes(97);
          instance.sigs.push({ encryptedSig, dleqProof });
        }

        return instance;
      }

      /**
       * The type for cet_adaptor_signature message. cet_adaptor_signature = 42774
       */
      public type = CetAdaptorSignatures.type;

      public length: bigint;

      public sigs: ISig[] = [];

      /**
       * Converts cet_adaptor_signature to JSON (canonical rust-dlc format)
       */
      public toJSON(): ICetAdaptorSignaturesJSON {
        return {
          ecdsaAdaptorSignatures: this.sigs.map((sig) => {
            // Combine encryptedSig and dleqProof into single signature field as expected by rust-dlc
            const signature = Buffer.concat([sig.encryptedSig, sig.dleqProof]);
            return {
              signature: signature.toString('hex'),
            };
          }),
        };
      }

      /**
       * Serializes the cet_adaptor_signature message into a Buffer
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        // writer.writeBigSize(this.type);

        const dataWriter = new BufferWriter();
        dataWriter.writeBigSize(this.sigs.length);

        for (const sig of this.sigs) {
          dataWriter.writeBytes(sig.encryptedSig);
          dataWriter.writeBytes(sig.dleqProof);
        }

        // writer.writeBigSize(dataWriter.size);
        writer.writeBytes(dataWriter.toBuffer());
        return writer.toBuffer();
      }
    }

    interface ISig {
      encryptedSig: Buffer;
      dleqProof: Buffer;
    }

    export interface ICetAdaptorSignaturesJSON {
      ecdsaAdaptorSignatures: ISigJSON[];
    }

    export interface ISigJSON {
      signature: string;
    }