using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using Debug = UnityEngine.Debug;

namespace Framework.Utils
{
    /// <summary>
    /// 文件操作工具类
    /// </summary>
    public static class FileUtils
    {
        /// <summary>
        /// 异步读取文本文件
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <param name="encoding">编码格式，默认UTF8</param>
        /// <returns>文件内容</returns>
        public static async Task<string> ReadTextAsync(string filePath, Encoding encoding = null)
        {
            try
            {
                if (!File.Exists(filePath))
                {
                    Debug.LogError($"文件不存在: {filePath}");
                    return null;
                }

                encoding = encoding ?? Encoding.UTF8;
                using (StreamReader reader = new StreamReader(filePath, encoding))
                {
                    return await reader.ReadToEndAsync();
                }
            }
            catch (System.Exception ex)
            {
                Debug.LogError($"读取文件失败: {filePath}\n{ex}");
                return null;
            }
        }

        /// <summary>
        /// 异步写入文本文件
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <param name="content">文件内容</param>
        /// <param name="encoding">编码格式，默认UTF8</param>
        /// <param name="append">是否追加模式</param>
        /// <returns>是否写入成功</returns>
        public static async Task<bool> WriteTextAsync(string filePath, string content, Encoding encoding = null, bool append = false)
        {
            try
            {
                string directory = Path.GetDirectoryName(filePath);
                if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
                {
                    Directory.CreateDirectory(directory);
                }

                encoding = encoding ?? Encoding.UTF8;
                using (StreamWriter writer = new StreamWriter(filePath, append, encoding))
                {
                    await writer.WriteAsync(content);
                }

                return true;
            }
            catch (System.Exception ex)
            {
                Debug.LogError($"写入文件失败: {filePath}\n{ex}");
                return false;
            }
        }

        /// <summary>
        /// 检查文件是否存在
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns>是否存在</returns>
        public static bool Exists(string filePath)
        {
            return File.Exists(filePath);
        }

        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns>是否删除成功</returns>
        public static bool Delete(string filePath)
        {
            try
            {
                if (File.Exists(filePath))
                {
                    File.Delete(filePath);
                    return true;
                }

                return false;
            }
            catch (System.Exception ex)
            {
                Debug.LogError($"删除文件失败: {filePath}\n{ex}");
                return false;
            }
        }


        /// <summary>
        /// 使用系统默认程序打开文件
        /// </summary>
        /// <param name="filePath">文件完整路径</param>
        /// <returns>是否成功打开</returns>
        public static bool OpenFile(string filePath)
        {
            try
            {
                if (!File.Exists(filePath))
                {
                    Debug.LogError($"文件不存在: {filePath}");
                    return false;
                }

                // 使用ProcessStartInfo来指定正确的打开方式
                ProcessStartInfo startInfo = new ProcessStartInfo();
                startInfo.FileName = filePath;
                startInfo.UseShellExecute = true; // 使用系统shell来执行，这样会用默认程序打开文件
                Process.Start(startInfo);

                return true;
            }
            catch (System.Exception ex)
            {
                Debug.LogError($"打开文件失败: {filePath}\n{ex}");
                return false;
            }
        }
    }
}