// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "forge-std/Test.sol";
import "../contracts/LabHelper.sol";

/// @title LabHelper Test Suite
/// @notice Foundry tests for LabHelper
contract LabHelperTest is Test {
    LabHelper public instance;

    event LogSetup(string message);

    function setUp() public {
        instance = new LabHelper("Convert latest review findings into one concrete");
        emit LogSetup("setUp complete");
    }

    // ── deployment tests ───────────────────────────────────────────────

    function test_Deployment() public view {
        assertEq(instance.topic(), "Convert latest review findings into one concrete", "initial topic mismatch");
    }

    function test_DeploymentNonEmpty() public view {
        assertTrue(bytes(instance.topic()).length > 0, "topic should not be empty");
    }

    // ── state mutation tests ───────────────────────────────────────────

    function test_SetTopic() public {
        string memory next = "updated value";
        instance.setTopic(next);
        assertEq(instance.topic(), next, "setTopic failed");
    }

    function test_SetTopicEmpty() public {
        instance.setTopic("");
        assertEq(instance.topic(), "", "setting empty topic failed");
    }

    function test_SetTopicTwice() public {
        instance.setTopic("first");
        instance.setTopic("second");
        assertEq(instance.topic(), "second", "double set failed");
    }

    // ── fuzz tests ────────────────────────────────────────────────────

    function testFuzz_SetTopic(string calldata newTopic) public {
        instance.setTopic(newTopic);
        assertEq(instance.topic(), newTopic, "fuzz setTopic mismatch");
    }

    // ── gas benchmarks ────────────────────────────────────────────────

    function test_SetTopicGas() public {
        uint256 gasBefore = gasleft();
        instance.setTopic("gas benchmark");
        uint256 gasUsed = gasBefore - gasleft();
        assertTrue(gasUsed < 100_000, "setTopic gas too high");
    }
}