using Godot;
using System;
using System.Collections.Generic;

namespace Rokojori
{ 

  [Tool]
  [GlobalClass,Icon("res://addons/rokojori_action_library/Icons/UI.svg")]
  public partial class UI : Control, IDisposable
  {     

    [Export]
    public UISettings settings;

    [Export]
    public float fontZoom = 1;

    public enum UpdateMode
    {
      Always,
      Only_Manual_Updates
    }
    [Export]
    public UpdateMode updateMode = UpdateMode.Always;

    [Export] 
    public bool useParentSize = false;

    [ExportGroup("Functions")]
    [ExportToolButton( "Mouse:Stop => Pass")]
    public Callable StopToPassButton => Callable.From( ()=>{ MakeStopToPass(); } );

    [Export]
    public Node[] stopToPassRoots = [];

    [ExportGroup("Read Only")]

    [Export]
    public float X_computedFontSizePixels = 1;    

   

    List<ICustomDisposer> _customDisposers = [];

    public void AddForDisposing( ICustomDisposer customDisposer )
    {
      _customDisposers.Add( customDisposer );
    }

    protected override void Dispose( bool disposing )
    {
      _customDisposers.ForEach( cd => cd.Dispose() );
      _customDisposers = [];
    }

    [Export]
    public string[] customDisposerIDs = [];

    public void MakeStopToPass()
    {
      var roots = stopToPassRoots;

      if ( roots == null || roots.Length == 0 )
      {
        roots = [ this ];
      }

      foreach ( var n in roots )
      {
        if ( n is Control c )
        {
          if ( c.MouseFilter == MouseFilterEnum.Stop )
          {
            c.MouseFilter = MouseFilterEnum.Pass;
          }
        }

        n.ForEach<Control>( 
          ( c )=>
          {
            if ( c.MouseFilter == MouseFilterEnum.Stop )
            {
              c.MouseFilter = MouseFilterEnum.Pass;
            }
          }
        );
      }
    }

    Vector2 cachedSize;

    public static UI Get( Control c )
    {
      return UIHolder.GetUI( c );
    }

    public static UIStylePropertyContainer GetStylePropertyContainerParent( Control c )
    {
      var it = c as Node;
      var walker = NodesWalker.Get();

      it = walker.Parent( it );

      if ( it is UI )
      {
        return null;
      }

      while ( it != null )
      {
        if ( it is UIStylePropertyContainer )
        {
          return it as UIStylePropertyContainer;
        }

        it = walker.Parent( it );
        
        if ( it is UI )
        {
          it = null;
        }
      }

      return null;
    }


    public static TimeLine GetTimeLine( Control c, TimeLine timeLine )
    {
      if ( timeLine != null )
      {
        return timeLine;
      }

      var ui = Get( c );

      if ( ui == null || ui.settings == null )
      {
        return null;
      }

      return ui.settings.defaultTimeline;
    }

    public override void _Process( double delta )
    {      
      if ( settings == null )
      {
        return;
      }

      if ( useParentSize )
      {
        var parentSize = GetParent<Control>().Size;

        if ( parentSize != cachedSize )
        {
          Size = parentSize;

          cachedSize = parentSize;

          // this.LogInfo( "Size Changed" );
        }

        
      }

      onProcess.DispatchEvent( (float)delta );
      UpdateFontSize();
      UpdateUIElements();

      // customDisposerIDs = _customDisposers.Map( c => c.GetUID() + ":" + c.GetInfo() ).ToArray();
      
    }

    public void UpdateExternal( float delta)
    {
      onProcess.DispatchEvent( delta );
      UpdateFontSize();
    }
    
    public readonly EventSlot<InputEvent> onInputEvent = new EventSlot<InputEvent>();
    public readonly EventSlot<float> onProcess = new EventSlot<float>();

    public override void _Input( InputEvent ie )
    {
      onInputEvent.DispatchEvent( ie );
    }

    List<UIHoverable> hoveredControls = new List<UIHoverable>();

    public void SetHovered( UIHoverable control )
    {
      hoveredControls.Add( control );
    }

    public void BindOwnChildren()
    {
      BindChildrenOf( this );
    }

    public void BindChildrenOf( Node node )
    {
      node.ForEach<UIImage>( img => img.SetUI( this ) ); 
      node.ForEach<UIInputInfo>( info => info.SetUI( this ) ); 
      node.ForEach<UIText>( text => text.SetUI( this ) );
      node.ForEach<UIRegion>( region => region.SetUI( this ) );     
    }

    public override void _Ready()
    {
      var sm = Unique<SensorManager>.Get();
      
      if ( sm != null )
      {
        sm._onActiveDeviceChange.AddAction( a => UpdateUIInputs() );
      }

      UpdateUIInputs();
    } 

    void UpdateUIInputs()
    { 
      Nodes.ForEach<UIInputInfo>( this, uii => uii.updateInfo = true );
    }



    void UpdateFontSize()
    {
      if ( settings == null )
      {
        return;
      }

      X_computedFontSizePixels = UINumber.Compute( this, settings.fontSize ) * fontZoom;   
      

      if ( Theme != null )
      {
        Theme.DefaultFontSize = Mathf.RoundToInt( X_computedFontSizePixels );
      }
    }

    void UpdateUIElements()
    {
      if ( UpdateMode.Always != updateMode )
      {
        return;
      }

      UpdateAllUIRegions();
    }

    public void UpdateAllUIRegions()
    {
      Nodes.ForEachDirectChild<UIRegion>( this, r => r.Layout() );
    }

    public static float GetWindowWidth( Control control )
    {
      if ( Engine.IsEditorHint() )
      {
        return ProjectSettings.GetSetting( "display/window/size/viewport_width" ).AsInt32();
      }
      else
      {
        return control.GetWindow().Size.X;
      }
    }

    public static float GetWindowHeight( Control control )
    {
      if ( Engine.IsEditorHint() )
      {
        return ProjectSettings.GetSetting( "display/window/size/viewport_height" ).AsInt32();
      }
      else
      {
        return control.GetWindow().Size.Y;
      }
    }
    

  }
}