using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace MAX.Framework.Extensions;

public static class StyleExtensions
{
	/// <summary>
	/// 合并指定的 <see cref="Style"/>。
	/// </summary>
	/// <param name="style1"></param>
	/// <param name="style2"></param>
	public static void Merge(this Style style1, Style style2)
	{
		if (style1 == null)
		{
			throw new ArgumentNullException("style1");
		}
		if (style2 == null)
		{
			throw new ArgumentNullException("style2");
		}

		if (style1.TargetType.IsAssignableFrom(style2.TargetType))
		{
			style1.TargetType = style2.TargetType;
		}

		if (style2.BasedOn != null)
		{
			style1.Merge(style2.BasedOn);
		}

		foreach (SetterBase currentSetter in style2.Setters)
		{
			style1.Setters.Add(currentSetter);
		}


		foreach (TriggerBase currentTrigger in style2.Triggers)
		{
			style1.Triggers.Add(currentTrigger);
		}

		// This code is only needed when using DynamicResources.
		foreach (object key in style2.Resources.Keys)
		{
			style1.Resources[key] = style2.Resources[key];
		}
	}

	/// <summary>
	/// 集合是否有值。
	/// </summary>
	/// <typeparam name="T"></typeparam>
	/// <param name="source"></param>
	/// <returns></returns>
	public static bool HasValue<T>(this IEnumerable<T> source)
	{
		return source != null && source.Any();
	}

	public static ResourceDictionary FindResourceDictionary(this Style style, object resourceKey)
	{
		if (style.Resources != null && style.Resources.Contains(resourceKey))
		{
			return style.Resources;
		}
		if (style.BasedOn != null)
		{
			return style.BasedOn.FindResourceDictionary(resourceKey);
		}
		return null;
	}

	public static void Merge(this ResourceDictionary resourceDictionary, ResourceDictionary mergee)
	{
		if (resourceDictionary != null && mergee != null && mergee.Count > 0)
		{
			foreach (var key in mergee.Keys)
			{
				if (!resourceDictionary.Contains(key))
				{
					resourceDictionary.Add(key, mergee[key]);
				}
			}
		}
	}
}