# All files / lib/messages OrderNegotiationFields.ts

87.71% Statements 50/57
50% Branches 7/14
100% Functions 12/12
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     import { BufferReader, BufferWriter } from '@node-dlc/bufio';

    import { IOrderOfferJSON, OrderOffer } from './OrderOffer';

    /**
     * Order negotiation fields for order contract negotiation.
     * Follows the same pattern as NegotiationFields with Single and Disjoint variants.
     */
    export abstract class OrderNegotiationFields {
      public static deserialize(buf: Buffer): OrderNegotiationFields {
        const reader = new BufferReader(buf);
        const discriminator = Number(reader.readBigSize());

        switch (discriminator) {
          case 0:
            return SingleOrderNegotiationFields.deserialize(buf);
          case 1:
            return DisjointOrderNegotiationFields.deserialize(buf);
          default:
            throw new Error(
              `Invalid OrderNegotiationFields discriminator: ${discriminator}. Must be 0 (Single) or 1 (Disjoint)`,
            );
        }
      }

      /**
       * Creates OrderNegotiationFields from JSON data
       * @param json JSON object representing order negotiation fields
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): OrderNegotiationFields {
        Iif (!json || typeof json !== 'object') {
          throw new Error('Invalid JSON input for OrderNegotiationFields');
        }

        const variant = json.variant;

        switch (variant) {
          case 'Single':
            return SingleOrderNegotiationFields.fromJSON(json);
          case 'Disjoint':
            return DisjointOrderNegotiationFields.fromJSON(json);
          default:
            throw new Error(
              `Unknown order negotiation fields variant: ${variant}. Must be 'Single' or 'Disjoint'`,
            );
        }
      }

      public abstract variant: 'Single' | 'Disjoint';
      public abstract discriminator: number;
      public abstract serialize(): Buffer;
      public abstract toJSON(): IOrderNegotiationFieldsJSON;
    }

    /**
     * Order negotiation fields for contract based on a single event (basic/empty).
     */
    export class SingleOrderNegotiationFields extends OrderNegotiationFields {
      /**
       * Creates a SingleOrderNegotiationFields from JSON data
       * @param json JSON object representing single order negotiation fields
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): SingleOrderNegotiationFields {
        const instance = new SingleOrderNegotiationFields();

        Iif (json.variant !== 'Single') {
          throw new Error(
            `Invalid variant for SingleOrderNegotiationFields: expected 'Single', got ${json.variant}`,
          );
        }

        // Single order negotiation fields are currently empty/basic
        return instance;
      }

      /**
       * Deserializes single order negotiation fields
       * @param buf
       */
      public static deserialize(buf: Buffer): SingleOrderNegotiationFields {
        const instance = new SingleOrderNegotiationFields();
        const reader = new BufferReader(buf);

        reader.readBigSize(); // read discriminator (0)
        // Single order negotiation fields are currently empty

        return instance;
      }

      public variant = 'Single' as const;
      public discriminator = 0;

      /**
       * Converts single order negotiation fields to JSON
       */
      public toJSON(): ISingleOrderNegotiationFieldsJSON {
        return {
          variant: this.variant,
        };
      }

      /**
       * Serializes the single order negotiation fields into a Buffer
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        writer.writeBigSize(this.discriminator);
        // Single order negotiation fields are currently empty

        return writer.toBuffer();
      }
    }

    /**
     * Order negotiation fields for contract based on multiple events.
     */
    export class DisjointOrderNegotiationFields extends OrderNegotiationFields {
      /**
       * Creates a DisjointOrderNegotiationFields from JSON data
       * @param json JSON object representing disjoint order negotiation fields
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): DisjointOrderNegotiationFields {
        const instance = new DisjointOrderNegotiationFields();

        Iif (json.variant !== 'Disjoint') {
          throw new Error(
            `Invalid variant for DisjointOrderNegotiationFields: expected 'Disjoint', got ${json.variant}`,
          );
        }

        if (!json.orderOffer) {
          throw new Error(
            'DisjointOrderNegotiationFields requires orderOffer field',
          );
        }

        instance.orderOffer = OrderOffer.fromJSON
          ? OrderOffer.fromJSON(json.orderOffer)
          : OrderOffer.deserialize(Buffer.from(json.orderOffer, 'hex'));

        return instance;
      }

      /**
       * Deserializes disjoint order negotiation fields
       * @param buf
       */
      public static deserialize(buf: Buffer): DisjointOrderNegotiationFields {
        const instance = new DisjointOrderNegotiationFields();
        const reader = new BufferReader(buf);

        reader.readBigSize(); // read discriminator (1)
        const orderOfferLength = reader.readBigSize();
        const orderOfferBuf = reader.readBytes(Number(orderOfferLength));
        instance.orderOffer = OrderOffer.deserialize(orderOfferBuf);

        return instance;
      }

      public variant = 'Disjoint' as const;
      public discriminator = 1;
      public orderOffer: OrderOffer;

      /**
       * Converts disjoint order negotiation fields to JSON
       */
      public toJSON(): IDisjointOrderNegotiationFieldsJSON {
        return {
          variant: this.variant,
          orderOffer: this.orderOffer.toJSON(),
        };
      }

      /**
       * Serializes the disjoint order negotiation fields into a Buffer
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        writer.writeBigSize(this.discriminator);

        const orderOfferData = this.orderOffer.serialize();
        writer.writeBigSize(orderOfferData.length);
        writer.writeBytes(orderOfferData);

        return writer.toBuffer();
      }
    }

    export type IOrderNegotiationFieldsJSON =
      | ISingleOrderNegotiationFieldsJSON
      | IDisjointOrderNegotiationFieldsJSON;

    export interface ISingleOrderNegotiationFieldsJSON {
      variant: 'Single';
    }

    export interface IDisjointOrderNegotiationFieldsJSON {
      variant: 'Disjoint';
      orderOffer: IOrderOfferJSON;
    }

    // Legacy exports for backward compatibility - map to new structure
    export const OrderNegotiationFieldsV0 = SingleOrderNegotiationFields; // V0 was basic/empty
    export const OrderNegotiationFieldsV1 = DisjointOrderNegotiationFields; // V1 had OrderOffer

    export type IOrderNegotiationFieldsV0JSON = ISingleOrderNegotiationFieldsJSON;
    export type IOrderNegotiationFieldsV1JSON = IDisjointOrderNegotiationFieldsJSON;