using System.Diagnostics;
using System.IO;
using System.Text.RegularExpressions;

namespace Build;

public class Helpers
{
	/// <summary>
	/// Returns a formatted version of the assembly that contains PowerShell cmdlets
	/// </summary>
	/// <param name="powershelModuleOutputLocation"></param>
	/// <returns></returns>
	public static string GetPowershellModuleVersion(string powershelModuleOutputLocation)
	{
		// When the project name changes, this dll will also need to be updated
		var moduleVersionInfo = FileVersionInfo.GetVersionInfo(Path.Combine(powershelModuleOutputLocation, "PowershellModule.dll"));

		// It's (almost) impossible to not have a product version tag here. There is a reason why the implementation
		// returns a string? but I can't find it and I don't really care too much. If we have null return an empty string
		// and append no version to the archive bundle.
		if (moduleVersionInfo.ProductVersion == null)
		{
			return string.Empty;
		}

		var versionRegex = new Regex(@"(\d+\.\d+\.\d+)(?:\-?([\w\-]+)\+?(\w+)?)?");
		var match = versionRegex.Match(moduleVersionInfo.ProductVersion);
		if (match.Success)
		{
			// If we have 4 groups, we've got a version number, suffix, and commit hash, so we return the first 2 as is
			// and the commit has capped to 8 characters
			if (match.Groups.Count == 4)
			{
				return $"{match.Groups[1]}-{match.Groups[2]}+{match.Groups[3].Value.Substring(0, 8)}";
			}

			if (match.Groups.Count == 3)
			{
				return $"{match.Groups[1]}-{match.Groups[2]}";
			}

			return $"{match.Groups[1]}";
		}

		return string.Empty;
	}
}