/* eslint-disable no-case-declarations */
import { Buffer } from 'buffer'
import { MsgSend, ProtoStdTx } from '../models/proto/generated/tx-signer'

export class ProtoTxDecoder {
  // Returns partially decoded transaction
  public unmarshalStdTx(
    encodedTxBytes: Buffer,
    length: number = encodedTxBytes.length
  ): ProtoStdTx {
    return ProtoStdTx.decode(encodedTxBytes.subarray(2), length - 2)
  }

  // Returns decoded transaction message data
  public decodeStdTxData(protoStdTx: ProtoStdTx) {
    switch (protoStdTx.msg?.typeUrl) {
      case '/x.nodes.MsgSend':
        const msgSendData = MsgSend.decode(protoStdTx.msg.value)

        const decodedStdTxData = {
          memo: protoStdTx.memo,
          entropy: protoStdTx.entropy,
          fee: protoStdTx.fee,
          msg: {
            typeUrl: protoStdTx.msg.typeUrl,
            value: {
              amount: msgSendData.amount,
              FromAddress: Buffer.from(msgSendData.FromAddress).toString('hex'),
              ToAddress: Buffer.from(msgSendData.ToAddress).toString('hex'),
            },
          },
          signature: protoStdTx.signature
            ? {
                publicKey: Buffer.from(protoStdTx.signature.publicKey).toString(
                  'hex'
                ),
                Signature: Buffer.from(protoStdTx.signature.Signature).toString(
                  'hex'
                ),
              }
            : protoStdTx.signature,
        }

        return decodedStdTxData
      default:
        throw Error('Decoding for transaction type not supported yet.')
    }
  }
}