namespace Pong.Scripts.Managers.UI.Menus;

public partial class Settings : BaseMenu
{
	private SettingsManager _settings;
	private SpinBox _scale;
	private OptionButton _vSync;
	private Button _saveButton;

	private bool _scaleModified;
	private bool _vSyncModified;

	public override void _EnterTree()
	{
		base._EnterTree();
		GetNodes();

		_scale.Value = _settings.SettingsData.Scale;
		_vSync.Selected = (int)_settings.SettingsData.VSync;
	}

	private void OnBackButtonPressed()
	{
		GetTree().ChangeSceneToFile("res://Scenes/UI/Menus/MainMenu.tscn");
	}

	/// <summary>
	/// get references to the nodes required for the settings menu to function and bind to events.
	/// </summary>
	private void GetNodes()
	{
		using var mainContainer = GetNode<VBoxContainer>("ScrollContainer/InternalMainContainer");

		_settings = GetNode<SettingsManager>("/root/SettingsManager");
		_scale = mainContainer.GetNode<SpinBox>("ScaleContainer/Scale");
		_vSync = mainContainer.GetNode<OptionButton>("VSyncContainer/VSyncOptions");
		_saveButton = GetNode<Button>("SaveButton");
	}

	/// <summary>
	/// method fired every time the scale value is changed.
	/// </summary>
	/// <param name="value">the new value</param>
	private void ScaleChanged(double value)
	{
		_scaleModified = !value.Equals(_settings.SettingsData.Scale);
		CheckIfModified();
	}

	/// <summary>
	/// method fired every time the VSync value is changed.
	/// </summary>
	/// <param name="index">the index of the VSync options box.</param>
	private void VSyncChanged(long index)
	{
		_vSyncModified = index != _settings.SettingsData.VSync;
		CheckIfModified();
	}

	/// <summary>
	/// changes the isModified bool to true if either of the modified booleans are true and enables the save button if
	/// the isModified bool is true.
	/// </summary>
	private void CheckIfModified()
	{
		var isModified = _scaleModified || _vSyncModified;
		_saveButton.Disabled = !isModified;
	}

	/// <summary>
	/// saves the new settings to a json file and disables the save button if that operation happens successfully.
	/// </summary>
	private async void OnSaveButtonPressed()
	{
		if (!await _settings.SaveSettings(_settings.SettingsData with { Scale = _scale.Value, VSync = _vSync.Selected})) return;
		_saveButton.Disabled = true;
		_scaleModified = false;
		_vSyncModified = false;
	}
}