# All files / lib/irc IrcMessage.ts

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     import { BufferReader, BufferWriter } from '@node-dlc/bufio';
    import { crc32c } from '@node-dlc/checksum';

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

    const MAX_DATA_LEN = 190;

    export abstract class IrcMessage {
      public static deserialize(buf: Buffer): IrcMessageV0 {
        const reader = new BufferReader(buf);

        const type = Number(reader.readUInt16BE());

        switch (type) {
          case MessageType.IrcMessageV0:
            return IrcMessageV0.deserialize(buf);
          default:
            throw new Error(`Irc message type must be IrcMessageV0`);
        }
      }

      public abstract type: number;

      public abstract serialize(): Buffer;
    }

    /**
     * IrcMessage contains information for Irc message packet.
     */
    export class IrcMessageV0 extends IrcMessage {
      public static type = MessageType.IrcMessageV0;

      public static fromBuffer(buf: Buffer, pubkey: Buffer): IrcMessageV0[] {
        const instances: IrcMessageV0[] = [];

        const checksum = crc32c(buf);

        const sequenceLength = Math.ceil(buf.length / MAX_DATA_LEN);

        const reader = new BufferReader(buf);
        const bufLen = buf.length;

        const currentTime = Math.floor(new Date().getTime() / 1000);

        for (let i = 0; i < sequenceLength; i++) {
          const sequenceNumber = i;
          const instance = new IrcMessageV0();

          instance.sequenceLength = BigInt(sequenceLength);
          instance.sequenceNumber = BigInt(sequenceNumber);
          instance.checksum = checksum;
          instance.pubkey = pubkey;
          instance.timestamp = currentTime;
          instance.data = reader.readBytes(
            Math.min(MAX_DATA_LEN, bufLen - reader.position),
          );

          instances.push(instance);
        }

        return instances;
      }

      public static fromString(str: string, pubkey: Buffer): IrcMessageV0[] {
        const buf = Buffer.from(str);

        return IrcMessageV0.fromBuffer(buf, pubkey);
      }

      /**
       * Deserializes an irc message
       * @param buf
       */
      public static deserialize(buf: Buffer): IrcMessageV0 {
        const instance = new IrcMessageV0();
        const reader = new BufferReader(buf);

        reader.readBigSize(); // read type

        instance.length = reader.readBigSize();

        instance.sequenceLength = reader.readBigSize();
        instance.sequenceNumber = reader.readBigSize();

        instance.checksum = reader.readUInt32BE();

        instance.signature = reader.readBytes(64);
        instance.pubkey = reader.readBytes(33);
        instance.timestamp = reader.readUInt32BE();

        const dataLen = reader.readUInt16BE();
        instance.data = reader.readBytes(dataLen);

        return instance;
      }

      public type = IrcMessageV0.type;

      public length: bigint;

      public sequenceLength: bigint;

      public sequenceNumber: bigint;

      public checksum: number;

      public signature: Buffer;

      public pubkey: Buffer;

      public timestamp: number;

      public data: Buffer;

      public serializeWithoutSig(): Buffer {
        const writer = new BufferWriter();
        writer.writeBigSize(this.sequenceLength);
        writer.writeBigSize(this.sequenceNumber);
        writer.writeUInt64BE(this.checksum);
        writer.writeBytes(this.pubkey);
        writer.writeUInt32BE(this.timestamp);
        writer.writeUInt16BE(this.data.length);
        writer.writeBytes(this.data);

        return writer.toBuffer();
      }

      /**
       * Serializes the irc_message_v0
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        writer.writeBigSize(this.type);

        const dataWriter = new BufferWriter();
        dataWriter.writeBigSize(this.sequenceLength);
        dataWriter.writeBigSize(this.sequenceNumber);
        dataWriter.writeUInt32BE(this.checksum);
        dataWriter.writeBytes(this.signature);
        dataWriter.writeBytes(this.pubkey);
        dataWriter.writeUInt32BE(this.timestamp);
        dataWriter.writeUInt16BE(this.data.length);
        dataWriter.writeBytes(this.data);

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

        return writer.toBuffer();
      }
    }

    export class IrcMessageWithoutSig {
      constructor(
        readonly sequenceLength: bigint,
        readonly sequenceNumber: bigint,
        readonly checksum: number,
        readonly signature: Buffer,
        readonly pubkey: Buffer,
        readonly data: Buffer,
      ) {}
    }