// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;

import {LoveScript} from "../script/Love.s.sol";
import {Love} from "../src/Love.sol";
import {Test} from "forge-std/Test.sol";

/// @notice The token is meant to live at the same address on every EVM network,
///         so these tests pin the CREATE2 deployment path and the inputs the
///         address derives from.
contract LoveCreate2Test is Test {
    bytes32 constant SALT = keccak256("LOVE");

    LoveScript script;

    function setUp() public {
        script = new LoveScript();

        // The canonical deterministic deployer, as it exists on live networks.
        assertGt(CREATE2_FACTORY.code.length, 0, "create2 deployer missing");
    }

    function test_DeploysAtPredictedAddress() public {
        address predicted = vm.computeCreate2Address(SALT, keccak256(type(Love).creationCode), CREATE2_FACTORY);

        Love deployed = Love(_deploy(SALT));

        assertEq(address(deployed), predicted);
        assertEq(deployed.symbol(), "LOVE");
    }

    /// @dev What the deploy script prints must be what the chain gives back.
    function test_ScriptPredictionMatchesDeployment() public {
        assertEq(script.predict(SALT), _deploy(SALT));
    }

    function test_ScriptUsesKeccakOfLoveAsDefaultSalt() public view {
        assertEq(script.DEFAULT_SALT(), SALT);
    }

    /// @dev Same salt, same code, same address — that is the whole point.
    function test_PredictionIsChainAgnostic() public {
        address onThisChain = script.predict(SALT);

        vm.chainId(137);
        assertEq(script.predict(SALT), onThisChain);

        vm.chainId(42_161);
        assertEq(script.predict(SALT), onThisChain);
    }

    function test_DifferentSaltsGiveDifferentAddresses() public view {
        assertTrue(script.predict(SALT) != script.predict(keccak256("LOVE2")));
    }

    /// @dev Redeploying with the same salt must fail, not silently return the
    ///      existing token.
    function test_RevertWhen_RedeployingWithSameSalt() public {
        _deploy(SALT);

        (bool ok,) = CREATE2_FACTORY.call(abi.encodePacked(SALT, type(Love).creationCode));
        assertFalse(ok);
    }

    function testFuzz_PredictionMatchesDeployment(bytes32 salt) public {
        assertEq(script.predict(salt), _deploy(salt));
    }

    function _deploy(bytes32 salt) internal returns (address deployed) {
        (bool ok, bytes memory ret) = CREATE2_FACTORY.call(abi.encodePacked(salt, type(Love).creationCode));
        require(ok, "create2 deployment failed");
        // casting to 'bytes20' is safe because the deployer returns the 20-byte address, raw
        // forge-lint: disable-next-line(unsafe-typecast)
        deployed = address(bytes20(ret));
    }
}