import { Hash } from "viem"
import {
  TransactionSender,
  TransactionSenderResponse,
  type TransactionSenderRequest,
} from "./TransactionSender"
import { mezoMainnet, mezoTestnet } from "./chains"

/**
 * A TransactionSender that relays through the Mezo relayer. Note that the Mezo
 * relayer verifies that the relayed call is to a Safe, a call to
 * execTransaction, and that the call refunds the relayer for spent gas. This
 * means the underlying smart account must be funded, and the signed
 * transaction must be performing the expected behavior.
 */
export default class MezoTransactionSender implements TransactionSender {
  private relayEndpoint: string

  // The address of the receiver of refunds; must match the expected receiver
  // of the relay, or the relay will reject transactions.
  public refundReceiver: string

  constructor(
    chainId: number = mezoMainnet.id,
    relayEndpoint?: string,
    refundReceiver?: string,
  ) {
    switch (chainId) {
      case mezoMainnet.id:
        this.relayEndpoint =
          relayEndpoint ?? "https://mezo.org/api/v2/relay/transactions"
        this.refundReceiver =
          refundReceiver ?? "0xf35c1a20303ddcA464Ebf5b3b023588Cf3181c8a" // Mezo Passport Mainnet Relayer
        break
      case mezoTestnet.id:
        this.relayEndpoint =
          relayEndpoint ?? "https://test.mezo.org/api/v2/relay/transactions"
        this.refundReceiver =
          refundReceiver ?? "0x6e80164ea60673D64d5d6228beb684a1274Bb017" // testertesting.eth
        break
      default:
        throw new Error(`Unsupported chainId: ${chainId}`)
    }
  }

  async sendTransaction(
    transactionRequest: TransactionSenderRequest,
  ): Promise<TransactionSenderResponse> {
    try {
      const response = await fetch(this.relayEndpoint, {
        method: "POST",
        body: JSON.stringify({
          txTo: transactionRequest.to,
          txData: transactionRequest.data,
        }),
        headers: { "Content-Type": "application/json" },
      })

      const { transactionHash } = (await response.json()) as {
        transactionHash: Hash
      }

      // eslint-disable-next-line no-console
      console.log(
        `Transaction successfully submitted with hash: ${transactionHash}`,
      )

      return { hash: transactionHash ?? "0x" }
    } catch (error) {
      // eslint-disable-next-line no-console
      console.log(`Error relaying transaction: ${error}`)
      throw error
    }
  }
}