# All files / lib/messages DlcClose.ts

78.64% Statements 81/103
50% Branches 26/52
75% Functions 12/16
78.21% Lines 79/101

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

    import { MessageType, PROTOCOL_VERSION } from '../MessageType';
    import { deserializeTlv } from '../serialize/deserializeTlv';
    import { getTlv } from '../serialize/getTlv';
    import { bigIntToNumber, toBigInt } from '../util';
    import { IDlcMessage } from './DlcMessage';
    import { FundingInput, IFundingInputJSON } from './FundingInput';
    import { FundingSignatures, IFundingSignaturesJSON } from './FundingSignatures';
    import { ScriptWitnessV0 } from './ScriptWitnessV0';

    /**
     * DlcClose message contains information about a node and indicates its
     * desire to close an existing contract.
     * Updated to follow DlcOffer architectural patterns.
     */
    export class DlcClose implements IDlcMessage {
      public static type = MessageType.DlcClose;

      /**
       * Creates a DlcClose from JSON data (e.g., from test vectors)
       * Handles both our internal format and external test vector formats
       * @param json JSON object representing a DLC close message
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): DlcClose {
        const instance = new DlcClose();

        // Basic fields with field name variations
        instance.protocolVersion =
          json.protocolVersion || json.protocol_version || PROTOCOL_VERSION;

        // Basic fields with field name variations
        instance.contractId = Buffer.from(
          json.contractId || json.contract_id,
          'hex',
        );
        instance.closeSignature = Buffer.from(
          json.closeSignature || json.close_signature,
          'hex',
        );

        // Use toBigInt helper to handle BigInt values from json-bigint
        instance.offerPayoutSatoshis = toBigInt(
          json.offerPayoutSatoshis || json.offer_payout_satoshis,
        );
        instance.acceptPayoutSatoshis = toBigInt(
          json.acceptPayoutSatoshis || json.accept_payout_satoshis,
        );
        instance.fundInputSerialId = toBigInt(
          json.fundInputSerialId || json.fund_input_serial_id,
        );

        // Use FundingInput.fromJSON() for each funding input - proper delegation
        instance.fundingInputs = (json.fundingInputs || json.funding_inputs || [])
          // eslint-disable-next-line @typescript-eslint/no-explicit-any
          .map((inputJson: any) => FundingInput.fromJSON(inputJson));

        // Create FundingSignatures manually since it doesn't have fromJSON
        if (json.fundingSignatures || json.funding_signatures) {
          instance.fundingSignatures = new FundingSignatures();
          const sigData = json.fundingSignatures || json.funding_signatures;

          // Handle different possible structures
          if (sigData.fundingSignatures) {
            // Standard format
            instance.fundingSignatures.witnessElements =
              sigData.fundingSignatures.map(
                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                (sig: any) =>
                  // eslint-disable-next-line @typescript-eslint/no-explicit-any
                  sig.witnessElements?.map((elem: any) => {
                    const witness = new ScriptWitnessV0();
                    witness.length =
                      elem.length || Buffer.from(elem.witness || '', 'hex').length;
                    witness.witness = Buffer.from(elem.witness || '', 'hex');
                    return witness;
                  }) || [],
              );
          } else IEif (Array.isArray(sigData)) {
            // Array format
            instance.fundingSignatures.witnessElements = sigData.map(
              // eslint-disable-next-line @typescript-eslint/no-explicit-any
              (sig: any) =>
                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                sig.witnessElements?.map((elem: any) => {
                  const witness = new ScriptWitnessV0();
                  witness.length =
                    elem.length || Buffer.from(elem.witness || '', 'hex').length;
                  witness.witness = Buffer.from(elem.witness || '', 'hex');
                  return witness;
                }) || [],
            );
          }
        }

        return instance;
      }

      /**
       * Deserializes a close_dlc message with backward compatibility
       * Detects old format (without protocol_version) vs new format (with protocol_version)
       * @param buf
       */
      public static deserialize(buf: Buffer): DlcClose {
        const instance = new DlcClose();
        const reader = new BufferReader(buf);

        const type = reader.readUInt16BE(); // read type

        // Validate type matches expected DlcClose type
        if (type !== MessageType.DlcClose) {
          throw new Error(
            `Invalid message type. Expected ${MessageType.DlcClose}, got ${type}`,
          );
        }

        // Read protocol version
        instance.protocolVersion = reader.readUInt32BE();
        instance.contractId = reader.readBytes(32);
        instance.closeSignature = reader.readBytes(64);
        instance.offerPayoutSatoshis = reader.readUInt64BE();
        instance.acceptPayoutSatoshis = reader.readUInt64BE();
        instance.fundInputSerialId = reader.readUInt64BE();

        // Changed from u16 to bigsize for consistency with DlcOffer
        const fundingInputsLen = Number(reader.readBigSize());

        for (let i = 0; i < fundingInputsLen; i++) {
          // FundingInput body is serialized directly without TLV wrapper in rust-dlc format
          const fundingInput = FundingInput.deserializeBody(
            Buffer.from(reader.buffer.subarray(reader.position)),
          );
          instance.fundingInputs.push(fundingInput);

          // Skip past the FundingInput we just read
          const fundingInputLength = fundingInput.serializeBody().length;
          reader.position += fundingInputLength;
        }

        // Handle FundingSignatures - deserialize raw data (no TLV wrapper) like DlcSign
        instance.fundingSignatures = FundingSignatures.deserialize(
          Buffer.from(reader.buffer.subarray(reader.position)),
        );

        // Skip past the funding signatures we just read
        const fundingLength = instance.fundingSignatures.serialize().length;
        reader.position += fundingLength;

        // Parse any additional TLV stream (for future extensibility)
        while (!reader.eof) {
          const buf = getTlv(reader);
          const tlvReader = new BufferReader(buf);
          const { type } = deserializeTlv(tlvReader);

          // Store unknown TLVs for future compatibility
          Iif (!instance.unknownTlvs) {
            instance.unknownTlvs = [];
          }
          instance.unknownTlvs.push({ type: Number(type), data: buf });
        }

        return instance;
      }

      /**
       * The type for close_dlc message. close_dlc = 52170
       */
      public type = DlcClose.type;

      // New fields as per dlcspecs PR #163
      public protocolVersion: number = PROTOCOL_VERSION; // Default to current protocol version

      public contractId: Buffer;

      public closeSignature: Buffer;

      public offerPayoutSatoshis: bigint;

      public acceptPayoutSatoshis: bigint;

      public fundInputSerialId: bigint;

      public fundingInputs: FundingInput[] = [];

      public fundingSignatures: FundingSignatures;

      // Store unknown TLVs for forward compatibility
      public unknownTlvs?: Array<{ type: number; data: Buffer }>;

      /**
       * Validates correctness of all fields
       * @throws Will throw an error if validation fails
       */
      public validate(): void {
        // Type is set automatically in class

        // protocol_version validation
        Iif (this.protocolVersion !== PROTOCOL_VERSION) {
          throw new Error(
            `Unsupported protocol version: ${this.protocolVersion}, expected: ${PROTOCOL_VERSION}`,
          );
        }

        // contractId validation
        if (!this.contractId || this.contractId.length !== 32) {
          throw new Error('contractId must be 32 bytes');
        }

        // closeSignature validation
        if (!this.closeSignature || this.closeSignature.length !== 64) {
          throw new Error('closeSignature must be 64 bytes');
        }

        // Ensure input serial ids are unique
        const inputSerialIds = this.fundingInputs.map(
          (input: FundingInput) => input.inputSerialId,
        );

        if (new Set(inputSerialIds).size !== inputSerialIds.length) {
          throw new Error('inputSerialIds must be unique');
        }

        // Ensure funding inputs are segwit
        this.fundingInputs.forEach((input: FundingInput) => input.validate());

        // Note: FundingSignatures doesn't have a validate method, so we skip validation
      }

      /**
       * Converts dlc_close to JSON (canonical rust-dlc format)
       */
      public toJSON(): IDlcCloseJSON {
        // Include unknown TLVs for debugging
        const tlvs = [];
        Iif (this.unknownTlvs) {
          this.unknownTlvs.forEach((tlv) =>
            tlvs.push({ type: tlv.type, data: tlv.data.toString('hex') }),
          );
        }

        // Return canonical rust-dlc format
        return {
          protocolVersion: this.protocolVersion,
          contractId: this.contractId.toString('hex'),
          closeSignature: this.closeSignature.toString('hex'),
          offerPayoutSatoshis: bigIntToNumber(this.offerPayoutSatoshis),
          acceptPayoutSatoshis: bigIntToNumber(this.acceptPayoutSatoshis),
          fundInputSerialId: bigIntToNumber(this.fundInputSerialId),
          fundingInputs: this.fundingInputs.map((input) => input.toJSON()),
          fundingSignatures: this.fundingSignatures.toJSON(),
        }; // Allow different field names from interface
      }

      /**
       * Serializes the close_dlc message into a Buffer
       * Updated serialization format to match DlcOffer patterns
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        writer.writeUInt16BE(this.type);

        // New fields as per dlcspecs PR #163
        writer.writeUInt32BE(this.protocolVersion);
        writer.writeBytes(this.contractId);
        writer.writeBytes(this.closeSignature);
        writer.writeUInt64BE(this.offerPayoutSatoshis);
        writer.writeUInt64BE(this.acceptPayoutSatoshis);
        writer.writeUInt64BE(this.fundInputSerialId);

        // Changed from u16 to bigsize for consistency with DlcOffer
        writer.writeBigSize(this.fundingInputs.length);

        for (const fundingInput of this.fundingInputs) {
          // Use serializeBody() to match rust-dlc behavior - funding inputs in vec are serialized without TLV wrapper
          writer.writeBytes(fundingInput.serializeBody());
        }

        // Serialize FundingSignatures directly (no TLV wrapper) like DlcSign
        writer.writeBytes(this.fundingSignatures.serialize());

        // Write unknown TLVs for forward compatibility
        Iif (this.unknownTlvs) {
          this.unknownTlvs.forEach((tlv) => {
            writer.writeBytes(tlv.data);
          });
        }

        return writer.toBuffer();
      }
    }

    export interface IDlcCloseJSON {
      type?: number; // Made optional for rust-dlc compatibility
      protocolVersion: number;
      contractId: string;
      closeSignature: string;
      offerPayoutSatoshis: number;
      acceptPayoutSatoshis: number;
      fundInputSerialId: number;
      fundingInputs: IFundingInputJSON[];
      fundingSignatures: IFundingSignaturesJSON;
      serialized?: string; // Made optional - hex serialization for compatibility testing
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      tlvs?: any[]; // Made optional - for unknown TLVs
    }