//! Example of how to transfer ERC20 tokens from one account to another.

use alloy::{

primitives::U256,

providers::{Provider, ProviderBuilder},

sol,

};

use eyre::Result;

// Codegen from artifact.

sol!(

#[allow(missing_docs)]

#[sol(rpc)]

ERC20Example,

"examples/artifacts/ERC20Example.json"

);

#[tokio::main]

async fn main() -> Result<()> {

// Spin up a forked Anvil node.

// Ensure `anvil` is available in $PATH.

let rpc_url = "https://reth-ethereum.ithaca.xyz/rpc";

let provider =

ProviderBuilder::new().connect_anvil_with_wallet_and_config(|anvil| anvil.fork(rpc_url))?;

// Create two users, Alice and Bob.

let accounts = provider.get_accounts().await?;

let alice = accounts[0];

let bob = accounts[1];

// Deploy the `ERC20Example` contract.

let contract = ERC20Example::deploy(provider).await?;

// Register the balances of Alice and Bob before the transfer.

let alice_before_balance = contract.balanceOf(alice).call().await?;

let bob_before_balance = contract.balanceOf(bob).call().await?;

// Transfer and wait for inclusion.

let amount = U256::from(100);

let tx_hash = contract.transfer(bob, amount).send().await?.watch().await?;

println!("Sent transaction: {tx_hash}");

// Register the balances of Alice and Bob after the transfer.

let alice_after_balance = contract.balanceOf(alice).call().await?;

let bob_after_balance = contract.balanceOf(bob).call().await?;

// Check the balances of Alice and Bob after the transfer.

assert_eq!(alice_before_balance - alice_after_balance, amount);

assert_eq!(bob_after_balance - bob_before_balance, amount);

Ok(())

}