using CliFx.Analyzers.Tests.Utils;
using Microsoft.CodeAnalysis.Diagnostics;
using Xunit;

namespace CliFx.Analyzers.Tests;

public class SystemConsoleShouldBeAvoidedAnalyzerSpecs
{
    private static DiagnosticAnalyzer Analyzer { get; } = new SystemConsoleShouldBeAvoidedAnalyzer();

    [Fact]
    public void Analyzer_reports_an_error_if_a_command_calls_a_method_on_SystemConsole()
    {
        // Arrange
        // language=cs
        const string code = @"
[Command]
public class MyCommand : ICommand
{
    public ValueTask ExecuteAsync(IConsole console)
    {
        Console.WriteLine(""Hello world"");
        return default;
    }
}";

        // Act & assert
        Analyzer.Should().ProduceDiagnostics(code);
    }

    [Fact]
    public void Analyzer_reports_an_error_if_a_command_accesses_a_property_on_SystemConsole()
    {
        // Arrange
        // language=cs
        const string code = @"
[Command]
public class MyCommand : ICommand
{
    public ValueTask ExecuteAsync(IConsole console)
    {
        Console.ForegroundColor = ConsoleColor.Black;
        return default;
    }
}";
        // Act & assert
        Analyzer.Should().ProduceDiagnostics(code);
    }

    [Fact]
    public void Analyzer_reports_an_error_if_a_command_calls_a_method_on_a_property_of_SystemConsole()
    {
        // Arrange
        // language=cs
        const string code = @"
[Command]
public class MyCommand : ICommand
{
    public ValueTask ExecuteAsync(IConsole console)
    {
        Console.Error.WriteLine(""Hello world"");
        return default;
    }
}";

        // Act & assert
        Analyzer.Should().ProduceDiagnostics(code);
    }

    [Fact]
    public void Analyzer_does_not_report_an_error_if_a_command_interacts_with_the_console_through_IConsole()
    {
        // Arrange
        // language=cs
        const string code = @"
[Command]
public class MyCommand : ICommand
{
    public ValueTask ExecuteAsync(IConsole console)
    {
        console.Output.WriteLine(""Hello world"");
        return default;
    }
}";

        // Act & assert
        Analyzer.Should().NotProduceDiagnostics(code);
    }

    [Fact]
    public void Analyzer_does_not_report_an_error_if_IConsole_is_not_available_in_the_current_method()
    {
        // Arrange
        // language=cs
        const string code = @"
[Command]
public class MyCommand : ICommand
{
    public void SomeOtherMethod() => Console.WriteLine(""Test"");

    public ValueTask ExecuteAsync(IConsole console) => default;
}";

        // Act & assert
        Analyzer.Should().NotProduceDiagnostics(code);
    }

    [Fact]
    public void Analyzer_does_not_report_an_error_if_a_command_does_not_access_SystemConsole()
    {
        // Arrange
        // language=cs
        const string code = @"
[Command]
public class MyCommand : ICommand
{
    public ValueTask ExecuteAsync(IConsole console)
    {
        return default;
    }
}";

        // Act & assert
        Analyzer.Should().NotProduceDiagnostics(code);
    }
}