# All files / lib/messages PayoutCurvePiece.ts

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

    import { MessageType, PayoutCurvePieceType } from '../MessageType';
    import { F64 } from '../serialize/F64';
    import { bigIntToNumber, toBigInt } from '../util';
    import { IDlcMessage } from './DlcMessage';

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

        switch (typeId) {
          case PayoutCurvePieceType.Polynomial:
            return PolynomialPayoutCurvePiece.deserialize(buf);
          case PayoutCurvePieceType.Hyperbola:
            return HyperbolaPayoutCurvePiece.deserialize(buf);
          default:
            throw new Error(
              `Payout curve piece type must be Polynomial (0) or Hyperbola (1), got ${typeId}`,
            );
        }
      }

      /**
       * Creates a PayoutCurvePiece from JSON data
       * @param json JSON object representing a payout curve piece
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): PayoutCurvePiece {
        Iif (!json) {
          throw new Error('payoutCurvePiece is required');
        }

        // Handle test vector format with nested types
        if (json.polynomialPayoutCurvePiece) {
          return PolynomialPayoutCurvePiece.fromJSON(
            json.polynomialPayoutCurvePiece,
          );
        } else Eif (json.hyperbolaPayoutCurvePiece) {
          return HyperbolaPayoutCurvePiece.fromJSON(json.hyperbolaPayoutCurvePiece);
        }
        // Handle direct format
        else if (json.points !== undefined || json.payoutPoints !== undefined) {
          return PolynomialPayoutCurvePiece.fromJSON(json);
        } else if (json.usePositivePiece !== undefined) {
          return HyperbolaPayoutCurvePiece.fromJSON(json);
        } else {
          throw new Error(
            'payoutCurvePiece must be either polynomial (with points) or hyperbola (with usePositivePiece)',
          );
        }
      }

      public abstract payoutCurvePieceType: PayoutCurvePieceType;
      public abstract type: number; // For backward compatibility
      public abstract toJSON():
        | PolynomialPayoutCurvePieceJSON
        | HyperbolaPayoutCurvePieceJSON;
      public abstract serialize(): Buffer;
    }

    /**
     * PolynomialPayoutCurvePiece defines a polynomial curve piece for payout functions.
     * This corresponds to type 0 in the sibling sub-type format.
     */
    export class PolynomialPayoutCurvePiece
      extends PayoutCurvePiece
      implements IDlcMessage {
      public static payoutCurvePieceType = PayoutCurvePieceType.Polynomial;

      /**
       * Creates a PolynomialPayoutCurvePiece from JSON data
       * @param json JSON object representing a polynomial payout curve piece
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): PolynomialPayoutCurvePiece {
        const instance = new PolynomialPayoutCurvePiece();

        const points = json.payoutPoints || json.points || [];
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        instance.points = points.map((point: any) => ({
          eventOutcome: toBigInt(point.eventOutcome || point.event_outcome),
          outcomePayout: toBigInt(point.outcomePayout || point.outcome_payout),
          extraPrecision: point.extraPrecision || point.extra_precision || 0,
        }));

        return instance;
      }

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

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

        for (let i = 0; i < numPts; i++) {
          const eventOutcome = reader.readUInt64BE();
          const outcomePayout = reader.readUInt64BE();
          const extraPrecision = reader.readUInt16BE();

          instance.points.push({
            eventOutcome,
            outcomePayout,
            extraPrecision,
          });
        }

        return instance;
      }

      /**
       * The type for polynomial_payout_curve_piece message - Note: this is a sub-component, not a standalone wire message
       */
      public type = MessageType.PolynomialPayoutCurvePiece;

      /**
       * The payout curve piece type for new format
       */
      public payoutCurvePieceType = PayoutCurvePieceType.Polynomial;

      public points: IPoint[] = [];

      /**
       * Converts polynomial_payout_curve_piece to JSON
       */
      public toJSON(): PolynomialPayoutCurvePieceJSON {
        return {
          polynomialPayoutCurvePiece: {
            payoutPoints: this.points.map((point) => {
              return {
                eventOutcome: bigIntToNumber(point.eventOutcome),
                outcomePayout: bigIntToNumber(point.outcomePayout),
                extraPrecision: Number(point.extraPrecision),
              };
            }),
          },
        };
      }

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

        writer.writeBigSize(this.payoutCurvePieceType);
        writer.writeBigSize(this.points.length);

        for (const point of this.points) {
          writer.writeUInt64BE(point.eventOutcome);
          writer.writeUInt64BE(point.outcomePayout);
          writer.writeUInt16BE(point.extraPrecision);
        }

        return writer.toBuffer();
      }
    }

    /**
     * HyperbolaPayoutCurvePiece defines a hyperbola curve piece for payout functions.
     * This corresponds to type 1 in the sibling sub-type format.
     * Updated to use F64 for precise f64 parameter handling.
     */
    export class HyperbolaPayoutCurvePiece
      extends PayoutCurvePiece
      implements IDlcMessage {
      public static payoutCurvePieceType = PayoutCurvePieceType.Hyperbola;

      /**
       * Helper function to safely parse F64 values from JSON
       * Handles both number and string inputs for maximum precision
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      private static parseF64Value(value: any): F64 | null {
        // Check for basic null/undefined
        Iif (value === null || value === undefined) {
          return null;
        }

        try {
          if (typeof value === 'string') {
            // Parse string directly to preserve precision
            try {
              return F64.fromString(value);
            } catch (error) {
              // If fromString fails, try parsing as number
              const numValue = parseFloat(value);
              if (!isNaN(numValue) && isFinite(numValue)) {
                return F64.fromNumber(numValue);
              }
            }
          } else Eif (typeof value === 'number') {
            // Parse number - handle special cases
            Iif (!isFinite(value)) {
              return null; // Reject NaN, Infinity, -Infinity
            }
            return F64.fromNumber(value);
          }

          // Try to convert other types to number as fallback
          const numValue = Number(value);
          if (!isNaN(numValue) && isFinite(numValue)) {
            return F64.fromNumber(numValue);
          }

          return null;
        } catch (error) {
          return null;
        }
      }

      /**
       * Creates a HyperbolaPayoutCurvePiece from JSON data
       * @param json JSON object representing a hyperbola payout curve piece
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): HyperbolaPayoutCurvePiece | null {
        Iif (!json || typeof json !== 'object') return null;

        // Handle both wrapped format and direct format
        let data =
          json.hyperbolaPayoutCurvePiece || json.hyperbola_payout_curve_piece;

        // If no wrapper found, assume direct format if it has the expected properties
        Eif (
          !data &&
          (json.usePositivePiece !== undefined ||
            json.use_positive_piece !== undefined)
        ) {
          data = json;
        }

        Iif (!data) return null;

        try {
          const usePositivePiece =
            data.usePositivePiece || data.use_positive_piece || false;

          // Parse each F64 value with null check
          const translateOutcome = this.parseF64Value(
            data.translateOutcome !== undefined
              ? data.translateOutcome
              : data.translate_outcome,
          );
          const translatePayout = this.parseF64Value(
            data.translatePayout !== undefined
              ? data.translatePayout
              : data.translate_payout,
          );
          const a = this.parseF64Value(data.a);
          const b = this.parseF64Value(data.b);
          const c = this.parseF64Value(data.c);
          const d = this.parseF64Value(data.d);

          // Check that all required values were parsed successfully
          Iif (!translateOutcome || !translatePayout || !a || !b || !c || !d) {
            throw new Error('Failed to parse one or more F64 values');
          }

          return new HyperbolaPayoutCurvePiece(
            usePositivePiece,
            translateOutcome,
            translatePayout,
            a,
            b,
            c,
            d,
          );
        } catch (error) {
          return null;
        }
      }

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

        reader.readBigSize(); // read type (1)
        instance.usePositivePiece = reader.readUInt8() === 1;

        // Read f64 values using F64 for precise handling - read raw 8-byte buffers
        instance.translateOutcome = F64.deserialize(reader.readBytes(8));
        instance.translatePayout = F64.deserialize(reader.readBytes(8));
        instance.a = F64.deserialize(reader.readBytes(8));
        instance.b = F64.deserialize(reader.readBytes(8));
        instance.c = F64.deserialize(reader.readBytes(8));
        instance.d = F64.deserialize(reader.readBytes(8));

        // Note: leftEndPoint and rightEndPoint are not part of the serialization
        // They will be set by PayoutFunction when creating from JSON
        instance.leftEndPoint = {
          eventOutcome: BigInt(0),
          outcomePayout: BigInt(0),
          extraPrecision: 0,
        };

        instance.rightEndPoint = {
          eventOutcome: BigInt(0),
          outcomePayout: BigInt(0),
          extraPrecision: 0,
        };

        return instance;
      }

      /**
       * The type for hyperbola_payout_curve_piece message - Note: this is a sub-component, not a standalone wire message
       */
      public type = MessageType.HyperbolaPayoutCurvePiece;

      public payoutCurvePieceType = HyperbolaPayoutCurvePiece.payoutCurvePieceType;

      // Use F64 for precise f64 parameter handling to avoid JavaScript precision issues
      public leftEndPoint: IPayoutPoint;
      public rightEndPoint: IPayoutPoint;
      public usePositivePiece: boolean;
      public translateOutcome: F64; // f64 - precise handling with F64
      public translatePayout: F64; // f64 - precise handling with F64
      public a: F64; // f64 - precise handling with F64
      public b: F64; // f64 - precise handling with F64
      public c: F64; // f64 - precise handling with F64
      public d: F64; // f64 - precise handling with F64

      constructor(
        usePositivePiece = false,
        translateOutcome?: string | F64,
        translatePayout?: string | F64,
        a?: string | F64,
        b?: string | F64,
        c?: string | F64,
        d?: string | F64,
      ) {
        super();
        this.usePositivePiece = usePositivePiece;

        // Convert string inputs to F64 objects, or use existing F64 objects
        this.translateOutcome = translateOutcome
          ? typeof translateOutcome === 'string'
            ? F64.fromString(translateOutcome)
            : translateOutcome
          : F64.fromNumber(0);
        this.translatePayout = translatePayout
          ? typeof translatePayout === 'string'
            ? F64.fromString(translatePayout)
            : translatePayout
          : F64.fromNumber(0);
        this.a = a
          ? typeof a === 'string'
            ? F64.fromString(a)
            : a
          : F64.fromNumber(0);
        this.b = b
          ? typeof b === 'string'
            ? F64.fromString(b)
            : b
          : F64.fromNumber(0);
        this.c = c
          ? typeof c === 'string'
            ? F64.fromString(c)
            : c
          : F64.fromNumber(0);
        this.d = d
          ? typeof d === 'string'
            ? F64.fromString(d)
            : d
          : F64.fromNumber(0);
      }

      /**
       * Converts hyperbola_payout_curve_piece to JSON
       * Uses F64.toJSONValue() which preserves precision by using strings for very large numbers
       */
      public toJSON(): HyperbolaPayoutCurvePieceJSON {
        return {
          hyperbolaPayoutCurvePiece: {
            usePositivePiece: this.usePositivePiece,
            translateOutcome: this.translateOutcome.toJSONValue(), // Smart conversion: number if safe, string if large
            translatePayout: this.translatePayout.toJSONValue(), // Preserves precision automatically
            a: this.a.toJSONValue(),
            b: this.b.toJSONValue(),
            c: this.c.toJSONValue(),
            d: this.d.toJSONValue(),
          },
        };
      }

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

        writer.writeBigSize(this.payoutCurvePieceType);
        writer.writeUInt8(this.usePositivePiece ? 1 : 0);

        // Write f64 values using F64 for precise handling - write raw 8-byte buffers
        writer.writeBytes(this.translateOutcome.serialize());
        writer.writeBytes(this.translatePayout.serialize());
        writer.writeBytes(this.a.serialize());
        writer.writeBytes(this.b.serialize());
        writer.writeBytes(this.c.serialize());
        writer.writeBytes(this.d.serialize());

        return writer.toBuffer();
      }
    }

    interface IPoint {
      eventOutcome: bigint;
      outcomePayout: bigint;
      extraPrecision: number;
    }

    interface IPointJSON {
      eventOutcome: number;
      outcomePayout: number;
      extraPrecision: number;
    }

    interface IPayoutPoint {
      eventOutcome: bigint;
      outcomePayout: bigint;
      extraPrecision: number;
    }

    export interface PolynomialPayoutCurvePieceJSON {
      polynomialPayoutCurvePiece: {
        payoutPoints: IPointJSON[];
      };
    }

    export interface HyperbolaPayoutCurvePieceJSON {
      hyperbolaPayoutCurvePiece: {
        usePositivePiece: boolean;
        translateOutcome: number | string;
        translatePayout: number | string;
        a: number | string;
        b: number | string;
        c: number | string;
        d: number | string;
      };
    }