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

namespace WIDESEAWCS_Common.ServiceLog
{
    public class ServiceLogger
    {
        private static ReaderWriterLockSlim LogWriteLock = new ReaderWriterLockSlim();

        private static string folderPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Log\\" + DateTime.Now.ToString("yyyy-MM-dd"));

        private static int size = 10485760;

        private static string ext = ".log";

        public static void WriteLogToFile(string fileName, string log)
        {
            try
            {
                LogWriteLock.EnterWriteLock();
                if (!Directory.Exists(folderPath))
                {
                    Directory.CreateDirectory(folderPath);
                }

                string path = Path.Combine(folderPath, GetLastAccessFileName(fileName));
                DateTime now = DateTime.Now;
                string contents = $"【{now}】{Environment.NewLine}{log}";
                File.AppendAllText(path, contents);
            }
            catch
            {
            }
            finally
            {
                LogWriteLock.ExitWriteLock();
            }
        }

        private static string GetLogFilePath(string folderPath, string fileName)
        {
            string fileName2 = fileName;
            List<FileInfo> list = (from fi in new DirectoryInfo(folderPath).GetFiles()
                                   where fi.Name.ToLower().Contains(fileName2.ToLower()) && fi.Extension.ToLower() == ext.ToLower() && fi.Length < size
                                   select fi into d
                                   orderby d.Name descending
                                   select d).ToList();
            if (list.Count > 0)
            {
                return list.FirstOrDefault().FullName;
            }

            return Path.Combine(folderPath, fileName2 + "_" + DateTime.Now.ToString("HH-mm-ss") + ".log");
        }

        private static string GetLastAccessFileName(string fileName)
        {
            string[] existLogFileNames = GetExistLogFileNames(fileName);
            foreach (string text in existLogFileNames)
            {
                if (new FileInfo(text).Length < size)
                {
                    return text;
                }
            }

            return fileName + "_" + DateTime.Now.ToString("HH-mm-ss") + ".log";
        }

        public static string[] GetExistLogFileNames(string fileName)
        {
            return Directory.GetFiles(folderPath, fileName + "*.log");
        }
    }
}