namespace Geekeey.Extensions.Process;

/// <summary>
/// Builder that helps configure environment variables.
/// </summary>
public sealed class EnvironmentVariablesBuilder
{
	private readonly Dictionary<string, string?> _vars = new(StringComparer.Ordinal);

	/// <summary>
	/// Sets an environment variable with the specified name to the specified value.
	/// </summary>
	public EnvironmentVariablesBuilder Set(string name, string? value)
	{
		_vars[name] = value;
		return this;
	}

	/// <summary>
	/// Sets multiple environment variables from the specified sequence of key-value pairs.
	/// </summary>
	public EnvironmentVariablesBuilder Set(IEnumerable<KeyValuePair<string, string?>> variables)
	{
		foreach (var (name, value) in variables)
		{
			Set(name, value);
		}

		return this;
	}

	/// <summary>
	/// Sets multiple environment variables from the specified dictionary.
	/// </summary>
	public EnvironmentVariablesBuilder Set(IReadOnlyDictionary<string, string?> variables)
		=> Set((IEnumerable<KeyValuePair<string, string?>>)variables);

	/// <summary>
	/// Builds the resulting environment variables.
	/// </summary>
	public IReadOnlyDictionary<string, string?> Build()
		=> new Dictionary<string, string?>(_vars, _vars.Comparer);
}