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import { MessageType } from '../MessageType';
import { bigIntToNumber, toBigInt } from '../util';
import { IDlcMessage } from './DlcMessage';
import {
HyperbolaPayoutCurvePiece,
HyperbolaPayoutCurvePieceJSON,
PayoutCurvePiece,
PolynomialPayoutCurvePieceJSON,
} from './PayoutCurvePiece';
/**
* PayoutFunction contains the payout curve definition for numeric outcome contracts.
* Updated to match rust-dlc format exactly.
*/
export class PayoutFunction implements IDlcMessage {
public static type = MessageType.PayoutFunction;
/**
* Creates a PayoutFunction from JSON data
* @param json JSON object representing a payout function
*/
// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
public static fromJSON(json: any): PayoutFunction {
const instance = new PayoutFunction();
// Parse payout function pieces
const pieces =
json.payoutFunctionPieces || json.payout_function_pieces || [];
instance.payoutFunctionPieces = pieces.map(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(pieceJson: any, index: number) => {
const piece = {
endPoint: {
eventOutcome: toBigInt(pieceJson.endPoint?.eventOutcome),
outcomePayout: toBigInt(pieceJson.endPoint?.outcomePayout),
extraPrecision: pieceJson.endPoint?.extraPrecision || 0,
},
payoutCurvePiece: PayoutCurvePiece.fromJSON(
pieceJson.payoutCurvePiece || pieceJson.payout_curve_piece,
),
};
// For HyperbolaPayoutCurvePiece, set the left and right end points
if (piece.payoutCurvePiece instanceof HyperbolaPayoutCurvePiece) {
const hyperbola = piece.payoutCurvePiece as HyperbolaPayoutCurvePiece;
// Left end point is this piece's endPoint
hyperbola.leftEndPoint = piece.endPoint;
// Right end point is the next piece's endPoint, or lastEndpoint if this is the last piece
Iif (index < pieces.length - 1) {
const nextPiece = pieces[index + 1];
hyperbola.rightEndPoint = {
eventOutcome: toBigInt(nextPiece.endPoint?.eventOutcome),
outcomePayout: toBigInt(nextPiece.endPoint?.outcomePayout),
extraPrecision: nextPiece.endPoint?.extraPrecision || 0,
};
} else {
// Use lastEndpoint for the final piece
const lastEndpoint = json.lastEndpoint || json.last_endpoint || {};
hyperbola.rightEndPoint = {
eventOutcome: toBigInt(lastEndpoint.eventOutcome),
outcomePayout: toBigInt(lastEndpoint.outcomePayout),
extraPrecision: lastEndpoint.extraPrecision || 0,
};
}
}
return piece;
},
);
// Parse last endpoint
const lastEndpoint = json.lastEndpoint || json.last_endpoint;
Eif (lastEndpoint) {
instance.lastEndpoint = {
eventOutcome: toBigInt(lastEndpoint.eventOutcome),
outcomePayout: toBigInt(lastEndpoint.outcomePayout),
extraPrecision: lastEndpoint.extraPrecision || 0,
};
} else {
// Default last endpoint if not provided
instance.lastEndpoint = {
eventOutcome: BigInt(0),
outcomePayout: BigInt(0),
extraPrecision: 0,
};
}
return instance;
}
/**
* Deserializes a payout_function message
* @param buf
*/
public static deserialize(buf: Buffer): PayoutFunction {
const instance = new PayoutFunction();
const reader = new BufferReader(buf);
// Read payout function pieces (as vec)
const numPieces = Number(reader.readBigSize());
for (let i = 0; i < numPieces; i++) {
// Read end_point first
const eventOutcome = reader.readUInt64BE();
const outcomePayout = reader.readUInt64BE();
const extraPrecision = reader.readUInt16BE();
// Read payout curve piece
const payoutCurvePieceStartPos = reader.position;
const payoutCurvePiece = PayoutCurvePiece.deserialize(
Buffer.from(reader.buffer.subarray(reader.position)),
);
// Skip past the payout curve piece bytes
const payoutCurvePieceSize = payoutCurvePiece.serialize().length;
reader.position = payoutCurvePieceStartPos + payoutCurvePieceSize;
instance.payoutFunctionPieces.push({
endPoint: {
eventOutcome,
outcomePayout,
extraPrecision,
},
payoutCurvePiece,
});
}
// Read last_endpoint
instance.lastEndpoint = {
eventOutcome: reader.readUInt64BE(),
outcomePayout: reader.readUInt64BE(),
extraPrecision: reader.readUInt16BE(),
};
return instance;
}
/**
* The type for payout_function message. payout_function = 42790
*/
public type = PayoutFunction.type;
public payoutFunctionPieces: IPayoutFunctionPiece[] = [];
public lastEndpoint: IPayoutPoint;
/**
* Constructor that ensures proper initialization
*/
constructor() {
// Explicitly initialize arrays to handle file-linking issues
this.payoutFunctionPieces = [];
}
/**
* Converts payout_function to JSON
*/
public toJSON(): PayoutFunctionJSON {
return {
payoutFunctionPieces: this.payoutFunctionPieces.map((piece) => ({
endPoint: {
eventOutcome: bigIntToNumber(piece.endPoint.eventOutcome),
outcomePayout: bigIntToNumber(piece.endPoint.outcomePayout),
extraPrecision: piece.endPoint.extraPrecision,
},
payoutCurvePiece: piece.payoutCurvePiece.toJSON(),
})),
lastEndpoint: {
eventOutcome: bigIntToNumber(this.lastEndpoint.eventOutcome),
outcomePayout: bigIntToNumber(this.lastEndpoint.outcomePayout),
extraPrecision: this.lastEndpoint.extraPrecision,
},
};
}
/**
* Serializes the payout_function message into a Buffer
*/
public serialize(): Buffer {
const writer = new BufferWriter();
// Write payout_function_pieces as vec (length + elements)
writer.writeBigSize(this.payoutFunctionPieces.length);
for (const piece of this.payoutFunctionPieces) {
// Write end_point first (matches rust order)
writer.writeUInt64BE(piece.endPoint.eventOutcome);
writer.writeUInt64BE(piece.endPoint.outcomePayout);
writer.writeUInt16BE(piece.endPoint.extraPrecision);
// Write payout_curve_piece second
writer.writeBytes(piece.payoutCurvePiece.serialize());
}
// Write last_endpoint
writer.writeUInt64BE(this.lastEndpoint.eventOutcome);
writer.writeUInt64BE(this.lastEndpoint.outcomePayout);
writer.writeUInt16BE(this.lastEndpoint.extraPrecision);
return writer.toBuffer();
}
}
// Legacy support
export const PayoutFunctionV0 = PayoutFunction;
export type PayoutFunctionV0 = PayoutFunction;
interface IPayoutPoint {
eventOutcome: bigint;
outcomePayout: bigint;
extraPrecision: number;
}
interface IPayoutPointJSON {
eventOutcome: number;
outcomePayout: number;
extraPrecision: number;
}
interface IPayoutFunctionPiece {
endPoint: IPayoutPoint;
payoutCurvePiece: PayoutCurvePiece;
}
interface IPayoutFunctionPieceJSON {
endPoint: IPayoutPointJSON;
payoutCurvePiece:
| PolynomialPayoutCurvePieceJSON
| HyperbolaPayoutCurvePieceJSON;
}
export interface PayoutFunctionJSON {
type?: number; // Optional for rust-dlc compatibility
payoutFunctionPieces: IPayoutFunctionPieceJSON[];
lastEndpoint: IPayoutPointJSON;
}
// Legacy interface
export type PayoutFunctionV0JSON = PayoutFunctionJSON;
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