using System.Collections.Generic;
using Content.Client.HUD.UI;
using Content.Shared;
using Robust.Shared.Configuration;
using Robust.Shared.IoC;

namespace Content.Client.Viewport
{
    /// <summary>
    ///     Event proxy for <see cref="MainViewport"/> to listen to config events.
    /// </summary>
    // ReSharper disable once ClassNeverInstantiated.Global
    public sealed class ViewportManager
    {
        [Dependency] private readonly IConfigurationManager _cfg = default!;

        private readonly List<MainViewport> _viewports = new();

        public void Initialize()
        {
            _cfg.OnValueChanged(CCVars.ViewportStretch, _ => UpdateCfg());
            _cfg.OnValueChanged(CCVars.ViewportSnapToleranceClip, _ => UpdateCfg());
            _cfg.OnValueChanged(CCVars.ViewportSnapToleranceMargin, _ => UpdateCfg());
            _cfg.OnValueChanged(CCVars.ViewportScaleRender, _ => UpdateCfg());
            _cfg.OnValueChanged(CCVars.ViewportFixedScaleFactor, _ => UpdateCfg());
        }

        private void UpdateCfg()
        {
            _viewports.ForEach(v => v.UpdateCfg());
        }

        public void AddViewport(MainViewport vp)
        {
            _viewports.Add(vp);
        }

        public void RemoveViewport(MainViewport vp)
        {
            _viewports.Remove(vp);
        }
    }
}