// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {Script, console} from "forge-std/Script.sol";
import {WETH} from "../contracts/tokens/WETH.sol";

/**
 * @title DeployWETH9Direct
 * @notice Deploy WETH9 directly to the exact address from genesis.json
 * @dev Since the address is pre-allocated in genesis.json, we can:
 *      1. Calculate the salt if we know the deployer (reverse CREATE2 calculation)
 *      2. Use vm.startPrank to impersonate any deployer address
 *      3. Deploy using CREATE2 with the calculated salt
 * 
 *      Alternatively, if the address is just pre-allocated in genesis, we might
 *      be able to deploy directly to it using vm.etch (for testing) or by
 *      ensuring the deployment happens at the right nonce/conditions.
 */
contract DeployWETH9Direct is Script {
    // Target address from genesis.json
    address constant TARGET_WETH9 = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    
    // Standard CREATE2 deployer (commonly used for deterministic deployments)
    address constant CREATE2_DEPLOYER = 0x4e59b44847b379578588920cA78FbF26c0B4956C;
    
    function run() external {
        console.log("Deploying WETH9 to exact address:", vm.toString(TARGET_WETH9));
        console.log("Strategy: Calculate salt or use direct deployment");
        
        // Get WETH bytecode
        bytes memory wethBytecode = type(WETH).creationCode;
        bytes32 bytecodeHash = keccak256(wethBytecode);
        
        console.log("WETH9 bytecode hash:", vm.toString(bytecodeHash));
        
        // Strategy 1: Try to calculate salt for known deployers
        // We'll try the standard CREATE2 deployer first
        uint256 salt = calculateSaltForAddress(CREATE2_DEPLOYER, wethBytecode, TARGET_WETH9);
        
        if (salt != type(uint256).max) {
            console.log("Found salt:", vm.toString(salt));
            console.log("Using CREATE2 deployer:", vm.toString(CREATE2_DEPLOYER));
            
            // Impersonate the CREATE2 deployer (if it exists on-chain)
            // If it doesn't exist, we'll need to deploy it first or use a different approach
            vm.startBroadcast();
            
            // Deploy using CREATE2 with the calculated salt
            address deployedAddress = deployWithCreate2(CREATE2_DEPLOYER, wethBytecode, salt);
            
            require(deployedAddress == TARGET_WETH9, "Address mismatch!");
            
            // Verify deployment
            WETH weth = WETH(payable(TARGET_WETH9));
            console.log("WETH9 name:", weth.name());
            console.log("WETH9 symbol:", weth.symbol());
            console.log("WETH9 decimals:", weth.decimals());
            
            vm.stopBroadcast();
            
            console.log("\n=== Deployment Summary ===");
            console.log("WETH9 Address:", vm.toString(TARGET_WETH9));
            console.log("Deployer:", vm.toString(CREATE2_DEPLOYER));
            console.log("Salt:", vm.toString(salt));
        } else {
            // Strategy 2: Since address is in genesis.json, it might be a special case
            // We can try deploying directly using vm.etch (for testing) or
            // by ensuring we deploy with the right nonce
            console.log("Could not calculate salt for known deployers");
            console.log("Trying alternative approach: deploy with vm.etch or direct deployment");
            
            vm.startBroadcast();
            
            // For testing: use vm.etch to set the bytecode directly
            // Note: This only works in fork mode or local testnets
            bytes memory deployedBytecode = abi.encodePacked(wethBytecode);
            
            // Verify if contract already exists
            uint256 codeSize;
            assembly {
                codeSize := extcodesize(TARGET_WETH9)
            }
            
            if (codeSize == 0) {
                // Deploy a new WETH contract - it will get a random address
                // But we want it at a specific address, so we need CREATE2
                console.log("Contract does not exist yet at target address");
                console.log("Need to use CREATE2 with correct salt and deployer");
                revert("Cannot deploy to exact address without CREATE2 parameters");
            } else {
                console.log("Contract already exists at target address");
                WETH weth = WETH(payable(TARGET_WETH9));
                console.log("WETH9 name:", weth.name());
            }
            
            vm.stopBroadcast();
        }
    }
    
    /**
     * @notice Calculate what salt would produce the target address
     * @dev This is a reverse CREATE2 calculation - we know the address, we need the salt
     *      Unfortunately, CREATE2 is a one-way function, so we can't directly reverse it
     *      But we can try common salts and see which one produces the target address
     *      
     *      CREATE2 formula: keccak256(0xff ++ deployer ++ salt ++ keccak256(bytecode))[12:]
     */
    function calculateSaltForAddress(
        address deployer,
        bytes memory bytecode,
        address target
    ) internal pure returns (uint256) {
        bytes32 bytecodeHash = keccak256(bytecode);
        
        // Try common salts
        bytes32[] memory commonSalts = new bytes32[](20);
        commonSalts[0] = bytes32(uint256(0)); // Zero
        commonSalts[1] = bytes32(uint256(1)); // One
        commonSalts[2] = bytes32(uint256(138)); // Chain ID
        commonSalts[3] = keccak256("WETH9");
        commonSalts[4] = keccak256("WETH");
        commonSalts[5] = keccak256(abi.encodePacked(target));
        commonSalts[6] = bytes32(uint256(uint160(target)));
        
        for (uint256 i = 7; i < 20; i++) {
            commonSalts[i] = keccak256(abi.encodePacked("WETH9", i));
        }
        
        for (uint256 i = 0; i < commonSalts.length; i++) {
            bytes32 hash = keccak256(
                abi.encodePacked(bytes1(0xff), deployer, commonSalts[i], bytecodeHash)
            );
            address computed = address(uint160(uint256(hash)));
            if (computed == target) {
                return uint256(commonSalts[i]);
            }
        }
        
        return type(uint256).max; // Not found
    }
    
    /**
     * @notice Deploy using CREATE2 with a specific deployer, bytecode, and salt
     * @dev This requires the deployer contract to exist or be deployed first
     */
    function deployWithCreate2(
        address deployerAddr,
        bytes memory bytecode,
        uint256 salt
    ) internal returns (address) {
        // If deployer doesn't exist, we'd need to deploy it first
        // For now, we'll use inline assembly to deploy with CREATE2
        
        address addr;
        assembly {
            let ptr := mload(0x40)
            
            // Copy bytecode to memory
            let bytecodeLength := mload(bytecode)
            let bytecodePtr := add(bytecode, 0x20)
            mstore(ptr, bytecodeLength)
            let codeDataPtr := add(ptr, 0x20)
            codecopy(codeDataPtr, bytecodePtr, bytecodeLength)
            
            // Deploy using CREATE2
            addr := create2(0, codeDataPtr, bytecodeLength, salt)
            
            if iszero(addr) {
                revert(0, 0)
            }
        }
        
        return addr;
    }
}