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

namespace ShowTrend3.Libs
{
    public static class TempDir
    {
        //private const char Slash = '\\';
        private const char Slash = '/';
        public enum Status { free, write, read };
        private static Dictionary<string, int> readFile = new Dictionary<string, int>();
        private static List<string> writeFile = new List<string>();

        public static void Clear()
        {
            try
            {
                var tempDir = Directory.GetCurrentDirectory() + Slash + "temp";
                if (!Directory.Exists(tempDir))
                    Directory.CreateDirectory(tempDir);
                string[] files = Directory.GetFiles(tempDir, "*");
                foreach (var e in files)
                {
                    if (readFile.ContainsKey(e.Split(Slash).Last()) || writeFile.Contains(e.Split(Slash).Last()))
                        continue;

                    DateTime createDate = File.GetCreationTime(e);
                    bool flag = createDate.Year == DateTime.Now.Year &&
                        createDate.Month == DateTime.Now.Month &&
                        createDate.Day == DateTime.Now.Day &&
                        (DateTime.Now - createDate).TotalMinutes > 2;
                    flag |= createDate.Day == DateTime.Now.AddDays(-1).Day &&
                        DateTime.Now.Hour == 0 &&
                        (DateTime.Now - createDate).TotalMinutes > 2;
                    flag |= (DateTime.Now - createDate).TotalHours > 1;
                    if (flag)
                        File.Delete(e);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }

        public static bool CheckFileExist(string onlyName)
        {
            return writeFile.Contains(onlyName) ||
                File.Exists(Directory.GetCurrentDirectory() + Slash + "temp" + Slash + onlyName);
        }

        public static FileStream StartWrite(string onlyName)
        {
            writeFile.Add(onlyName);
            return new FileStream(Directory.GetCurrentDirectory() + Slash + "temp" + Slash + onlyName, FileMode.CreateNew);
        }
        public static void EndWrite(string onlyName)
        {
            writeFile.Remove(onlyName);
        }

        public static void LockRead(string onlyName)
        {
            if (!readFile.ContainsKey(onlyName))
                readFile.Add(onlyName, 0);
            readFile[onlyName]++;
        }
        public static bool CanRead(string onlyName)
        {
            if (!CheckFileExist(onlyName))
                return false;
            return !writeFile.Contains(onlyName);
        }
        public static FileStream StartRead(string onlyName)
        {
            return new FileStream(Directory.GetCurrentDirectory() + Slash + "temp" + Slash + onlyName, FileMode.Open);
        }
        public static void FreeRead(string onlyName)
        {
            if (!readFile.ContainsKey(onlyName))
                return;
            if (readFile[onlyName] > 0)
                readFile[onlyName]--;
            if (readFile[onlyName] == 0)
                readFile.Remove(onlyName);
        }
    }
}