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import {
concat, dataSlice, getBigInt, getBytes, encodeRlp, assertArgument
} from "../utils/index.js";
import { getAddress } from "./address.js";
import type { BigNumberish, BytesLike } from "../utils/index.js";
// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
/**
* Returns the address that would result from a ``CREATE`` for %%tx%%.
*
* This can be used to compute the address a contract will be
* deployed to by an EOA when sending a deployment transaction (i.e.
* when the ``to`` address is ``null``).
*
* This can also be used to compute the address a contract will be
* deployed to by a contract, by using the contract's address as the
* ``to`` and the contract's nonce.
*
* @example
* from = "0x8ba1f109551bD432803012645Ac136ddd64DBA72";
* nonce = 5;
*
* getCreateAddress({ from, nonce });
* //_result:
*/
export function getCreateAddress(tx: { from: string, nonce: BigNumberish }): string {
const from = getAddress(tx.from);
const nonce = getBigInt(tx.nonce, "tx.nonce");
let nonceHex = nonce.toString(16);
if (nonceHex === "0") {
nonceHex = "0x";
} else if (nonceHex.length % 2) {
nonceHex = "0x0" + nonceHex;
} else {
nonceHex = "0x" + nonceHex;
}
return getAddress(dataSlice(keccak256(encodeRlp([ from, nonceHex ])), 12));
}
/**
* Returns the address that would result from a ``CREATE2`` operation
* with the given %%from%%, %%salt%% and %%initCodeHash%%.
*
* To compute the %%initCodeHash%% from a contract's init code, use
* the [[keccak256]] function.
*
* For a quick overview and example of ``CREATE2``, see [[link-ricmoo-wisps]].
*
* @example
* // The address of the contract
* from = "0x8ba1f109551bD432803012645Ac136ddd64DBA72"
*
* // The salt
* salt = id("HelloWorld")
*
* // The hash of the initCode
* initCode = "0x6394198df16000526103ff60206004601c335afa6040516060f3";
* initCodeHash = keccak256(initCode)
*
* getCreate2Address(from, salt, initCodeHash)
* //_result:
*/
export function getCreate2Address(_from: string, _salt: BytesLike, _initCodeHash: BytesLike): string {
const from = getAddress(_from);
const salt = getBytes(_salt, "salt");
const initCodeHash = getBytes(_initCodeHash, "initCodeHash");
assertArgument(salt.length === 32, "salt must be 32 bytes", "salt", _salt);
assertArgument(initCodeHash.length === 32, "initCodeHash must be 32 bytes", "initCodeHash", _initCodeHash);
return getAddress(dataSlice(keccak256(concat([ "0xff", from, salt, initCodeHash ])), 12))
}
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