using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Resources;

namespace WxOrder.Framework.Helpers;

/// <summary>
/// WPF 资源读取帮助类
/// 支持 Resource、Embedded Resource、Content 三种方式
/// </summary>
public static class ResourceHelper
{
	/// <summary>
	/// 从 WPF 应用程序资源中读取文本内容（Build Action = Resource）
	/// </summary>
	/// <param name="relativePath">相对路径，如 "Ctrls/PDDInvoice/Resources/invoice.js"</param>
	/// <param name="assemblyName">程序集名称，可选，默认使用当前程序集</param>
	/// <returns>文件内容字符串</returns>
	public static string GetResourceText(string relativePath, string assemblyName = null)
	{
		try
		{
			// 构建 pack URI
			string uriString;
			if (string.IsNullOrEmpty(assemblyName))
			{
				// 当前程序集
				uriString = $"pack://application:,,,/{relativePath}";
			}
			else
			{
				// 指定程序集
				uriString = $"pack://application:,,,/{assemblyName};component/{relativePath}";
			}

			var uri = new Uri(uriString, UriKind.Absolute);
			StreamResourceInfo resourceInfo = Application.GetResourceStream(uri);

			if (resourceInfo == null)
			{
				throw new FileNotFoundException($"资源未找到: {relativePath}");
			}

			using (var reader = new StreamReader(resourceInfo.Stream))
			{
				return reader.ReadToEnd();
			}
		}
		catch (Exception ex)
		{
			return "";
		}
	}

	/// <summary>
	/// 从嵌入资源中读取文本内容（Build Action = Embedded Resource）
	/// </summary>
	/// <param name="resourceName">完整资源名称，如 "YourNamespace.Ctrls.PDDInvoice.Resources.invoice.js"</param>
	/// <param name="assembly">程序集，默认使用当前程序集</param>
	/// <returns>文件内容字符串</returns>
	public static string GetEmbeddedResourceText(string resourceName, Assembly assembly = null)
	{
		try
		{
			assembly ??= Assembly.GetExecutingAssembly();

			using (var stream = assembly.GetManifestResourceStream(resourceName))
			{
				if (stream == null)
				{
					throw new FileNotFoundException($"嵌入资源未找到: {resourceName}");
				}

				using (var reader = new StreamReader(stream))
				{
					return reader.ReadToEnd();
				}
			}
		}
		catch (Exception ex)
		{
			throw new InvalidOperationException($"读取嵌入资源失败: {resourceName}", ex);
		}
	}

	/// <summary>
	/// 从嵌入资源中读取文本内容，自动查找资源名称（支持部分匹配）
	/// </summary>
	/// <param name="fileName">文件名，如 "invoice.js"</param>
	/// <param name="assembly">程序集，默认使用当前程序集</param>
	/// <returns>文件内容字符串</returns>
	public static string GetEmbeddedResourceTextByFileName(string fileName, Assembly assembly = null)
	{
		assembly ??= Assembly.GetExecutingAssembly();

		// 查找匹配的资源名称
		var resourceNames = assembly.GetManifestResourceNames();
		var matchedName = Array.Find(resourceNames, name => name.EndsWith(fileName));

		if (string.IsNullOrEmpty(matchedName))
		{
			throw new FileNotFoundException($"未找到名为 {fileName} 的嵌入资源");
		}

		return GetEmbeddedResourceText(matchedName, assembly);
	}

	/// <summary>
	/// 从文件系统读取文本内容（Build Action = Content）
	/// </summary>
	/// <param name="filePath">文件物理路径或相对路径</param>
	/// <returns>文件内容字符串</returns>
	public static string GetFileText(string filePath)
	{
		try
		{
			if (!File.Exists(filePath))
			{
				throw new FileNotFoundException($"文件未找到: {filePath}");
			}

			return File.ReadAllText(filePath, System.Text.Encoding.UTF8);
		}
		catch (Exception ex)
		{
			throw new InvalidOperationException($"读取文件失败: {filePath}", ex);
		}
	}

	/// <summary>
	/// 读取 JS 资源（专门针对 JS 文件的便捷方法）
	/// </summary>
	/// <param name="relativePath">JS 文件相对路径</param>
	/// <returns>JS 文件内容</returns>
	public static string GetJavaScriptResource(string relativePath)
	{
		return GetResourceText(relativePath);
	}
}