# All files / lib/messages EventDescriptor.ts

96.51% Statements 83/86
67.57% Branches 25/37
100% Functions 13/13
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     import { BufferReader, BufferWriter } from '@node-dlc/bufio';

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

    export abstract class EventDescriptor {
      public static deserialize(
        buf: Buffer,
      ): EnumEventDescriptor | DigitDecompositionEventDescriptor {
        const reader = new BufferReader(buf);

        const type = Number(reader.readBigSize());

        switch (type) {
          case MessageType.EnumEventDescriptor:
            return EnumEventDescriptor.deserialize(buf);
          case MessageType.DigitDecompositionEventDescriptor:
            return DigitDecompositionEventDescriptor.deserialize(buf);
          default:
            throw new Error(
              `Payout function TLV type must be EnumEventDescriptorV0 or DigitDecompositionEventDescriptor`,
            );
        }
      }

      /**
       * Creates an EventDescriptor from JSON data
       * @param json JSON object representing event descriptor
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): EventDescriptor {
        Iif (!json) {
          throw new Error('eventDescriptor is required');
        }

        // Check if it's an enum event or digit decomposition event
        if (json.enumEvent || json.enum_event) {
          return EnumEventDescriptor.fromJSON(json.enumEvent || json.enum_event);
        } else Eif (json.digitDecompositionEvent || json.digit_decomposition_event) {
          return DigitDecompositionEventDescriptor.fromJSON(
            json.digitDecompositionEvent || json.digit_decomposition_event,
          );
        } else {
          throw new Error(
            'eventDescriptor must have either enumEvent or digitDecompositionEvent',
          );
        }
      }

      public abstract type: number;

      public abstract length: bigint;

      public abstract toJSON():
        | IEnumEventDescriptorJSON
        | IDigitDecompositionEventDescriptorJSON;

      public abstract serialize(): Buffer;
    }

    /**
     * EnumEventDescriptor message contains the event outcomes for enumerated events.
     * Simplified class name (removed V0 suffix).
     */
    export class EnumEventDescriptor
      extends EventDescriptor
      implements IDlcMessage {
      public static type = MessageType.EnumEventDescriptorV0;

      /**
       * Creates an EnumEventDescriptor from JSON data
       * @param json JSON object representing an enum event descriptor
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): EnumEventDescriptor {
        const instance = new EnumEventDescriptor();
        instance.outcomes = json.outcomes || [];
        return instance;
      }

      /**
       * Deserializes an enum_event_descriptor_v0 message
       * @param buf
       */
      public static deserialize(buf: Buffer): EnumEventDescriptor {
        const instance = new EnumEventDescriptor();
        const reader = new BufferReader(buf);

        reader.readBigSize(); // read type
        instance.length = reader.readBigSize(); // need to fix this
        reader.readUInt16BE(); // num_outcomes

        while (!reader.eof) {
          const outcomeLen = reader.readBigSize();
          const outcomeBuf = reader.readBytes(Number(outcomeLen));
          instance.outcomes.push(outcomeBuf.toString());
        }

        return instance;
      }

      /**
       * The type for enum_event_descriptor_v0 message. enum_event_descriptor_v0 = 55302
       */
      public type = EnumEventDescriptor.type;

      public length = BigInt(0); // Required by EventDescriptor parent class

      public outcomes: string[] = [];

      /**
       * Converts enum_event_descriptor to JSON
       */
      public toJSON(): IEnumEventDescriptorJSON {
        return {
          enumEvent: {
            outcomes: this.outcomes,
          },
        };
      }

      /**
       * Serializes the enum_event_descriptor_v0 message into a Buffer
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        writer.writeBigSize(this.type);

        const dataWriter = new BufferWriter();
        dataWriter.writeUInt16BE(this.outcomes.length);

        for (const outcome of this.outcomes) {
          dataWriter.writeBigSize(outcome.length);
          dataWriter.writeBytes(Buffer.from(outcome));
        }

        writer.writeBigSize(dataWriter.size);
        writer.writeBytes(dataWriter.toBuffer());

        return writer.toBuffer();
      }
    }

    // Legacy support - keep V0 alias for backward compatibility
    export const EnumEventDescriptorV0 = EnumEventDescriptor;
    export type EnumEventDescriptorV0 = EnumEventDescriptor;

    /**
     * DigitDecompositionEventDescriptor is a simple enumeration of outcomes.
     * Simplified class name (removed V0 suffix).
     */
    export class DigitDecompositionEventDescriptor
      extends EventDescriptor
      implements IDlcMessage {
      public static type = MessageType.DigitDecompositionEventDescriptor;

      /**
       * Creates a DigitDecompositionEventDescriptor from JSON data
       * @param json JSON object representing digit decomposition event descriptor
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): DigitDecompositionEventDescriptor {
        const instance = new DigitDecompositionEventDescriptor();
        instance.base = json.base || 10;
        instance.isSigned = json.isSigned || json.is_signed || false;
        instance.unit = json.unit || '';
        instance.precision = json.precision || 0;
        instance.nbDigits = json.nbDigits || json.nb_digits || 0;
        return instance;
      }

      /**
       * Deserializes an digit_decomposition_event_descriptor message
       * @param buf
       */
      public static deserialize(buf: Buffer): DigitDecompositionEventDescriptor {
        const instance = new DigitDecompositionEventDescriptor();
        const reader = new BufferReader(buf);

        reader.readBigSize(); // read type
        instance.length = reader.readBigSize(); // need to fix this

        /**
         * NOTE: BASE IS INCORRECT FORMAT FOR DLC SPEC (SHOULD BE BIGSIZE)
         * Will be fixed in oracle_announcement_v1
         * https://github.com/discreetlogcontracts/dlcspecs/blob/master/Oracle.md#version-0-digit_decomposition_event_descriptor
         */
        instance.base = reader.readUInt16BE();
        instance.isSigned = reader.readUInt8() === 1;
        const unitLen = reader.readBigSize();
        const unitBuf = reader.readBytes(Number(unitLen));
        instance.unit = unitBuf.toString();
        instance.precision = reader.readUInt32BE();
        instance.nbDigits = reader.readUInt16BE();

        return instance;
      }

      /**
       * The type for digit_decomposition_event_descriptor message. digit_decomposition_event_descriptor = 55306
       */
      public type = DigitDecompositionEventDescriptor.type;

      public length: bigint;

      public base: number; // Switch to bigint in oracle_announcement_v1

      public isSigned: boolean;

      public unit: string;

      public precision: number;

      public nbDigits: number;

      /**
       * Validates correctness of all fields in the message
       * https://github.com/discreetlogcontracts/dlcspecs/blob/master/Oracle.md
       * @throws Will throw an error if validation fails
       */
      public validate(): void {
        if (this.base <= 0) {
          throw new Error('base must be greater than 0');
        }

        // TODO: support isSigned according to specifications
        if (this.isSigned) {
          throw new Error('node-dlc does not support isSigned');
        }
      }

      /**
       * Converts digit_decomposition_event_descriptor to JSON (canonical rust-dlc format)
       */
      public toJSON(): IDigitDecompositionEventDescriptorJSON {
        return {
          digitDecompositionEvent: {
            base: this.base,
            isSigned: this.isSigned,
            unit: this.unit,
            precision: this.precision,
            nbDigits: this.nbDigits,
          },
        };
      }

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

        const dataWriter = new BufferWriter();
        dataWriter.writeUInt16BE(this.base); // Switch to BigSize in oracle_announcement_v1
        dataWriter.writeUInt8(this.isSigned ? 1 : 0);
        dataWriter.writeBigSize(this.unit.length);
        dataWriter.writeBytes(Buffer.from(this.unit));
        dataWriter.writeUInt32BE(this.precision);
        dataWriter.writeUInt16BE(this.nbDigits);

        writer.writeBigSize(dataWriter.size);
        writer.writeBytes(dataWriter.toBuffer());

        return writer.toBuffer();
      }
    }

    // Legacy support - keep V0 alias for backward compatibility
    export const DigitDecompositionEventDescriptorV0 = DigitDecompositionEventDescriptor;
    export type DigitDecompositionEventDescriptorV0 = DigitDecompositionEventDescriptor;

    export interface IEnumEventDescriptorJSON {
      enumEvent: {
        outcomes: string[];
      };
    }

    // Rust-dlc enum variant format for DigitDecompositionEventDescriptor
    export interface IDigitDecompositionEventDescriptorJSON {
      digitDecompositionEvent: {
        base: number;
        isSigned: boolean;
        unit: string;
        precision: number;
        nbDigits: number;
      };
    }

    // Legacy interface
    export type IEnumEventDescriptorV0JSON = IEnumEventDescriptorJSON;

    // Legacy interface
    export type IDigitDecompositionEventDescriptorV0JSON = IDigitDecompositionEventDescriptorJSON;