using System.Text;

using Newtonsoft.Json;

namespace Vbdsm.Common
{
    public class FileHelper
    {
        public static T? ReadFileInfo<T>(string fileName) where T : new()
        {
            var str = ReadFileInfo(fileName);
            return Str2Obj<T>(str);
        }

        public static string ReadFileInfo(string fileName, string path = "Data")
        {
            string filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, $"{path}\\{fileName}.json");
            StringBuilder sb = new StringBuilder();
            if (File.Exists(filePath)) //文件存在
            {
                try
                {
                    FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
                    StreamReader reader = new StreamReader(fs, Encoding.UTF8);
                    while (reader.ReadLine() is { } line)
                    {
                        sb.Append(line);
                    }
                    reader.Close();
                    fs.Close();
                }
                catch
                {
                    // ignored
                }
            }

            return sb.ToString();
        }

        public static void SaveFileInfo(object obj, string fileName)
        {
            string str = Obj2Str(obj);
            SaveFileInfo(str, fileName);
        }

        public static void SaveFileInfo(string contents, string fileName)
        {
            string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, $"Data");
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            string filePath = $"{path}\\{fileName}.json";
            File.WriteAllText(filePath, contents);
        }

        public static T? Str2Obj<T>(string str) where T : new()
        {
            if (!string.IsNullOrEmpty(str))
            {
                try
                {
                    return JsonConvert.DeserializeObject<T>(str);
                }
                catch //(Exception e)
                {
                    return default;
                }
            }
            return default;
        }

        public static string Obj2Str(object obj)
        {
            return JsonConvert.SerializeObject(obj, Formatting.Indented);
        }
    }
}