namespace AssetRipper.IO.Files;

public static class SpecialFileNames
{
	public static bool IsEngineResource(string? fileName)
	{
		return IsDefaultResource(fileName) || IsEditorResource(fileName);
	}

	public static bool IsDefaultResource(string? fileName)
	{
		return fileName is DefaultResourceName1 or DefaultResourceName2;
	}

	public static bool IsEditorResource(string? fileName)
	{
		return fileName is EditorResourceName;
	}

	public static bool IsBuiltinExtra(string? fileName)
	{
		return fileName is BuiltinExtraName1 or BuiltinExtraName2;
	}

	public static bool IsDefaultResourceOrBuiltinExtra(string? fileName)
	{
		return IsDefaultResource(fileName) || IsBuiltinExtra(fileName);
	}

	public static bool IsEngineGeneratedF(string? fileName)
	{
		return fileName is EngineGeneratedF;
	}

	public static string FixFileIdentifier(string name)
	{
		name = name.ToLowerInvariant();
		name = FixDependencyName(name);
		name = FixResourcePath(name);
		return name;
	}

	public static string FixDependencyName(string dependency)
	{
		if (dependency.StartsWith(LibraryFolder, StringComparison.Ordinal))
		{
			return dependency.Substring(LibraryFolder.Length);
		}
		else if (dependency.StartsWith(ResourcesFolder, StringComparison.Ordinal))
		{
			return dependency.Substring(ResourcesFolder.Length);
		}
		return dependency;
	}

	public static string FixResourcePath(string resourcePath)
	{
		const string archivePrefix = "archive:/";
		if (resourcePath.StartsWith(archivePrefix, StringComparison.Ordinal))
		{
			return Path.GetFileName(resourcePath);
		}
		else
		{
			return resourcePath;
		}
	}

	/// <summary>
	/// Remove .dll extension from the assembly name and add the "Assembly - " prefix if appropriate.
	/// </summary>
	/// <param name="assembly">An assembly name.</param>
	/// <returns>A new string if changed, otherwise the original string.</returns>
	public static string FixAssemblyName(string assembly)
	{
		return RemoveAssemblyFileExtension(IsAssemblyIdentifier(assembly) ? $"Assembly - {assembly}" : assembly);
	}

	/// <summary>
	/// Remove .dll extension from the assembly name.
	/// </summary>
	/// <param name="assembly">An assembly name.</param>
	/// <returns>A new string if changed, otherwise the original string.</returns>
	public static string RemoveAssemblyFileExtension(string assembly)
	{
		return assembly.EndsWith(AssemblyExtension, StringComparison.Ordinal) ? assembly[..^AssemblyExtension.Length] : assembly;
	}

	public static string AddAssemblyFileExtension(string assembly)
	{
		return assembly.EndsWith(AssemblyExtension, StringComparison.Ordinal) ? assembly : assembly + AssemblyExtension;
	}

	public static bool IsProjectAssembly(string assembly)
	{
		const string PrefixName = "Assembly";
		return assembly.StartsWith($"{PrefixName} - ", StringComparison.Ordinal) || assembly.StartsWith($"{PrefixName}-", StringComparison.Ordinal);
	}

	private static bool IsAssemblyIdentifier(string assembly)
	{
		return assembly
			is "Boo"
			or "Boo - first pass"
			or "CSharp"
			or "CSharp - first pass"
			or "UnityScript"
			or "UnityScript - first pass";
	}

	public const string LibraryFolder = "library/";
	public const string ResourcesFolder = "resources/";
	public const string DefaultResourceName1 = "unity default resources";
	public const string DefaultResourceName2 = "unity_default_resources";
	public const string EditorResourceName = "unity editor resources";
	public const string BuiltinExtraName1 = "unity builtin extra";
	public const string BuiltinExtraName2 = "unity_builtin_extra";
	public const string EngineGeneratedF = "0000000000000000f000000000000000";
	public const string AssemblyExtension = ".dll";
}