using System;
using System.IO;

namespace WpfApp.Utils
{
    public static class IconHelper
    {
        /// <summary>
        /// 获取图标路径（智能搜索）
        /// </summary>
        /// <param name="iconFileName">图标文件名，例如 "FMSDGAUGE-main.ico"，为空使用默认图标</param>
        /// <param name="externalDirs">可选外部搜索目录</param>
        /// <returns>图标绝对路径</returns>
        public static string GetIconPath(string iconFileName = null, string[] externalDirs = null)
        {
            // 默认图标文件名
            string defaultIconName = "FMSDGAUGE-main.ico";
            iconFileName ??= defaultIconName;

            // 默认项目图标目录（相对于 EXE）
            string projectIconDir = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"..\..\..\src\public");

            // 先搜索项目目录
            string path = SearchDirectory(projectIconDir, iconFileName);
            if (!string.IsNullOrEmpty(path))
                return path;

            // 再搜索外部目录
            if (externalDirs != null)
            {
                foreach (var dir in externalDirs)
                {
                    path = SearchDirectory(dir, iconFileName);
                    if (!string.IsNullOrEmpty(path))
                        return path;
                }
            }

            // 都没找到就抛异常
            throw new FileNotFoundException($"找不到图标文件: {iconFileName}");
        }

        /// <summary>
        /// 获取图标目录路径（智能推断）
        /// </summary>
        /// <param name="externalDirs">可选外部搜索目录</param>
        /// <returns>图标目录的绝对路径</returns>
        public static string GetIconDirectoryPath(string[] externalDirs = null)
        {
            // 默认项目图标目录（相对于 EXE）
            string projectIconDir = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"..\..\..\src\public");
            string fullPath = Path.GetFullPath(projectIconDir);

            if (Directory.Exists(fullPath))
                return fullPath;

            // 如果外部目录存在则返回第一个有效路径
            if (externalDirs != null)
            {
                foreach (var dir in externalDirs)
                {
                    if (Directory.Exists(dir))
                        return Path.GetFullPath(dir);
                }
            }

            // 否则抛异常
            throw new DirectoryNotFoundException($"找不到图标目录: {fullPath}");
        }
        
        /// <summary>
        /// 在指定目录及子目录搜索文件
        /// </summary>
        private static string SearchDirectory(string rootDir, string fileName)
        {
            if (string.IsNullOrEmpty(rootDir) || !Directory.Exists(rootDir))
                return null;

            var files = Directory.GetFiles(rootDir, fileName, SearchOption.AllDirectories);
            if (files.Length > 0)
                return Path.GetFullPath(files[0]);

            return null;
        }
    }
}