using System;
using System.IO;
using System.Linq;
using Microsoft.CodeAnalysis;

namespace Cfa;

internal static class AuthoredSource
{
    public static bool Includes(SyntaxTree tree, Document document)
    {
        var path = document.FilePath ?? tree.FilePath;
        if (
            document.Project.FilePath is string projectPath
            && Path.IsPathRooted(path)
            && Path.GetDirectoryName(projectPath) is string projectDirectory
        )
        {
            path = Path.GetRelativePath(projectDirectory, path);
        }
        if (
            path.Split(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar)
                .Any(segment =>
                    segment.Equals("obj", StringComparison.OrdinalIgnoreCase)
                    || segment.Equals("bin", StringComparison.OrdinalIgnoreCase)
                )
        )
        {
            return false;
        }

        var name = Path.GetFileName(path);
        if (
            name.EndsWith(".g.cs", StringComparison.OrdinalIgnoreCase)
            || name.EndsWith(".g.i.cs", StringComparison.OrdinalIgnoreCase)
            || name.EndsWith(".generated.cs", StringComparison.OrdinalIgnoreCase)
            || name.EndsWith(".designer.cs", StringComparison.OrdinalIgnoreCase)
        )
        {
            return false;
        }

        return true;
    }
}