using Xunit;

using FluentAssertions;

using ZXBasicStudio.BuildSystem;

using System.IO;

using System.Collections.Generic;

using System.Linq;

namespace ZXBasicStudioTest

{

public class UsageDetectionTests

{

[Fact]

public void ZXBasicMap_ShouldDetectSigilVariableUsage()

{

// Arrange

string tempDir = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());

Directory.CreateDirectory(tempDir);

string mainFileContent = "dim a$ as string\na$ = \"Hello\"\nprint a$";

string mainPath = Path.Combine(tempDir, "main.bas");

File.WriteAllText(mainPath, mainFileContent);

var mainCodeFile = new ZXCodeFile(mainPath);

var allFiles = new List<ZXCodeFile> { mainCodeFile };

string buildLog = ""; // No unused warnings for now

// Act

var basicMap = new ZXBasicMap(mainCodeFile, allFiles, buildLog);

// Assert

basicMap.GlobalVariables.Should().Contain(v => v.Name == "a$");

var varA = basicMap.GlobalVariables.First(v => v.Name == "a$");

varA.Unused.Should().BeFalse("a$ is used later in the code");

// Cleanup

Directory.Delete(tempDir, true);

}

[Fact]

public void ZXBasicMap_ShouldDistinguishSigilAndNonSigilVariables()

{

// Arrange

string tempDir = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());

Directory.CreateDirectory(tempDir);

// a is used, a$ is NOT used (only defined)

string mainFileContent = "dim a as integer\ndim a$ as string\na = 10\nprint a";

string mainPath = Path.Combine(tempDir, "main.bas");

File.WriteAllText(mainPath, mainFileContent);

var mainCodeFile = new ZXCodeFile(mainPath);

var allFiles = new List<ZXCodeFile> { mainCodeFile };

string buildLog = "";

// Act

var basicMap = new ZXBasicMap(mainCodeFile, allFiles, buildLog);

// Assert

basicMap.GlobalVariables.Should().Contain(v => v.Name == "a");

basicMap.GlobalVariables.Should().NotContain(v => v.Name == "a$", "a$ is NOT used, so it should be skipped (if it's not marked as unused in buildLog, the local regex check should mark it as unused and it's skipped in GlobalVariables list generation)");

// Cleanup

Directory.Delete(tempDir, true);

}

}

}