# All files / lib/messages ContractDescriptor.ts

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

    import { ContractDescriptorType, MessageType } from '../MessageType';
    import { IDlcMessage } from './DlcMessage';
    import { PayoutFunction, PayoutFunctionV0JSON } from './PayoutFunction';
    import { IRoundingIntervalsJSON, RoundingIntervals } from './RoundingIntervals';

    export abstract class ContractDescriptor {
      public static deserialize(
        buf: Buffer,
      ): EnumeratedDescriptor | NumericalDescriptor {
        const reader = new BufferReader(buf);
        const typeId = Number(reader.readBigSize());

        switch (typeId) {
          case ContractDescriptorType.Enumerated:
            return EnumeratedDescriptor.deserialize(buf);
          case ContractDescriptorType.NumericOutcome:
            return NumericalDescriptor.deserialize(buf);
          default:
            throw new Error(
              `Contract descriptor type must be Enumerated (0) or NumericOutcome (1), got ${typeId}`,
            );
        }
      }

      /**
       * Creates a ContractDescriptor from JSON data (e.g., from test vectors)
       * @param json JSON object representing a contract descriptor
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): ContractDescriptor {
        Iif (!json) {
          throw new Error('contractDescriptor is required');
        }

        // Handle enumerated contract descriptor
        if (
          json.enumeratedContractDescriptor ||
          json.enumerated_contract_descriptor
        ) {
          return EnumeratedDescriptor.fromJSON(
            json.enumeratedContractDescriptor ||
              json.enumerated_contract_descriptor,
          );
        }
        // Handle numeric outcome contract descriptor
        else Eif (
          json.numericOutcomeContractDescriptor ||
          json.numeric_outcome_contract_descriptor
        ) {
          return NumericalDescriptor.fromJSON(
            json.numericOutcomeContractDescriptor ||
              json.numeric_outcome_contract_descriptor,
          );
        } else {
          throw new Error(
            'contractDescriptor must have either enumeratedContractDescriptor or numericOutcomeContractDescriptor',
          );
        }
      }

      public abstract contractDescriptorType: ContractDescriptorType;
      public abstract type: number; // For backward compatibility
      public abstract toJSON(): EnumeratedDescriptorJSON | NumericalDescriptorJSON;
      public abstract serialize(): Buffer;
    }

    /**
     * EnumeratedContractDescriptor contains information about a contract's outcomes
     * and their corresponding payouts (for enumerated outcomes).
     * This corresponds to the previous ContractDescriptorV0.
     */
    export class EnumeratedDescriptor
      extends ContractDescriptor
      implements IDlcMessage {
      public static contractDescriptorType = ContractDescriptorType.Enumerated;

      /**
       * Creates an EnumeratedContractDescriptor from JSON data
       * @param json JSON object representing an enumerated contract descriptor
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): EnumeratedDescriptor {
        const instance = new EnumeratedDescriptor();

        const payouts = json.payouts || [];
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        instance.outcomes = payouts.map((payout: any) => ({
          outcome: payout.outcome,
          localPayout: BigInt(payout.offerPayout || 0), // Use canonical offerPayout field
        }));

        return instance;
      }

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

        reader.readBigSize(); // read type (0)
        const numOutcomes = Number(reader.readBigSize());

        for (let i = 0; i < numOutcomes; i++) {
          const outcomeLen = Number(reader.readBigSize());
          const outcome = reader.readBytes(outcomeLen).toString();
          const localPayout = reader.readUInt64BE();

          instance.outcomes.push({
            outcome,
            localPayout,
          });
        }

        return instance;
      }

      /**
       * The type for enumerated_contract_descriptor message - using MessageType for IDlcMessage compatibility
       */
      public type = MessageType.ContractDescriptorV0; // For IDlcMessage compatibility

      /**
       * The contract descriptor type for new format
       */
      public contractDescriptorType = ContractDescriptorType.Enumerated;

      public outcomes: IOutcome[] = [];

      /**
       * Converts enumerated_contract_descriptor to JSON
       */
      public toJSON(): EnumeratedDescriptorJSON {
        // Return enum variant format for Rust compatibility
        return {
          enumeratedContractDescriptor: {
            payouts: this.outcomes.map((outcome) => ({
              outcome: outcome.outcome,
              offerPayout: Number(outcome.localPayout), // Use offerPayout to match Rust
            })),
          },
        };
      }

      /**
       * Serializes the enumerated_contract_descriptor message into a Buffer
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();

        writer.writeBigSize(this.contractDescriptorType);
        writer.writeBigSize(this.outcomes.length);

        for (const outcome of this.outcomes) {
          writer.writeBigSize(outcome.outcome.length);
          writer.writeBytes(Buffer.from(outcome.outcome));
          writer.writeUInt64BE(outcome.localPayout);
        }

        return writer.toBuffer();
      }
    }

    /**
     * NumericOutcomeContractDescriptor contains information about a contract's outcomes
     * and their corresponding payouts (for numeric outcomes).
     * This corresponds to the previous ContractDescriptorV1.
     */
    export class NumericalDescriptor
      extends ContractDescriptor
      implements IDlcMessage {
      public static contractDescriptorType = ContractDescriptorType.NumericOutcome;

      /**
       * Creates a NumericOutcomeContractDescriptor from JSON data
       * @param json JSON object representing a numeric outcome contract descriptor
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): NumericalDescriptor {
        const instance = new NumericalDescriptor();

        instance.numDigits = json.numDigits || json.num_digits || 0;

        // Parse payout function using proper fromJSON method
        instance.payoutFunction = PayoutFunction.fromJSON(
          json.payoutFunction || json.payout_function,
        );

        // Parse rounding intervals using proper fromJSON method
        instance.roundingIntervals = RoundingIntervals.fromJSON(
          json.roundingIntervals || json.rounding_intervals,
        );

        return instance;
      }

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

        reader.readBigSize(); // read type (1)
        instance.numDigits = reader.readUInt16BE();

        // Parse payout function - need to calculate its size to avoid consuming all bytes
        const payoutFunctionStartPos = reader.position;
        const tempPayoutFunction = PayoutFunction.deserialize(
          reader.buffer.subarray(reader.position),
        );
        instance.payoutFunction = tempPayoutFunction;

        // Skip past the payout function bytes
        const payoutFunctionSize = tempPayoutFunction.serialize().length;
        reader.position = payoutFunctionStartPos + payoutFunctionSize;

        // Parse remaining bytes as rounding intervals
        instance.roundingIntervals = RoundingIntervals.deserialize(
          reader.buffer.subarray(reader.position),
        );

        return instance;
      }

      /**
       * The type for numeric_outcome_contract_descriptor message - using MessageType for IDlcMessage compatibility
       */
      public type = MessageType.ContractDescriptorV1; // For IDlcMessage compatibility

      /**
       * The contract descriptor type for new format
       */
      public contractDescriptorType = ContractDescriptorType.NumericOutcome;

      public numDigits: number;

      public payoutFunction: PayoutFunction;

      public roundingIntervals: RoundingIntervals;

      /**
       * Validates correctness of all fields in the message
       * https://github.com/discreetlogcontracts/dlcspecs/blob/master/Messaging.md#the-contract_descriptor-type
       * @throws Will throw an error if validation fails
       */
      public validate(): void {
        this.roundingIntervals.validate();
      }

      /**
       * Converts numeric_outcome_contract_descriptor to JSON
       */
      public toJSON(): NumericalDescriptorJSON {
        // Return enum variant format for Rust compatibility
        return {
          numericOutcomeContractDescriptor: {
            numDigits: this.numDigits,
            payoutFunction: this.payoutFunction.toJSON(),
            roundingIntervals: this.roundingIntervals.toJSON(),
          },
        };
      }

      /**
       * Serializes the numeric_outcome_contract_descriptor message into a Buffer
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();

        writer.writeBigSize(this.contractDescriptorType);
        writer.writeUInt16BE(this.numDigits);
        writer.writeBytes(this.payoutFunction.serialize());
        writer.writeBytes(this.roundingIntervals.serialize());

        return writer.toBuffer();
      }
    }

    // Legacy support - keeping old class names as aliases
    export const ContractDescriptorV0 = EnumeratedDescriptor;
    export const ContractDescriptorV1 = NumericalDescriptor;
    export type ContractDescriptorV0 = EnumeratedDescriptor;
    export type ContractDescriptorV1 = NumericalDescriptor;

    interface IOutcome {
      outcome: string;
      localPayout: bigint;
    }

    // Rust-dlc enum variant format for EnumeratedDescriptor
    export interface EnumeratedDescriptorJSON {
      enumeratedContractDescriptor: {
        payouts: Array<{
          outcome: string;
          offerPayout: number;
        }>;
      };
    }

    // Rust-dlc enum variant format for NumericalDescriptor
    export interface NumericalDescriptorJSON {
      numericOutcomeContractDescriptor: {
        numDigits: number;
        payoutFunction: PayoutFunctionV0JSON;
        roundingIntervals: IRoundingIntervalsJSON;
      };
    }

    // Legacy interfaces for backward compatibility
    export type ContractDescriptorV0JSON = EnumeratedDescriptorJSON;
    export type ContractDescriptorV1JSON = NumericalDescriptorJSON;