using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;

namespace MQTTServerSideAPI
{
    public static class Logger
    {
        public static void LogSide(string message, string side) {
            string logFilePath = GetLogFile(side);
            using (StreamWriter  sw = new StreamWriter(logFilePath, true)) { 
                sw.WriteLine($"{DateTime.Now.ToString()} - {message}");
                sw.Close();
            }
        }
        public static string GetLogFile(string side)
        {
            string logPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Logs");
            if (!Directory.Exists(logPath))
            {
                Directory.CreateDirectory(logPath);
            }

            //string logFilePath = Path.Combine(logPath, $"{DateTime.Now.ToString("yyyyMMdd")}_{side}.log");
            string logFilePath = Path.Combine(logPath, $"mqtttest_{side}.log");
            return logFilePath;
        }
        public static void LogCallinSide(string message)
        {
            LogSide(message, "callin");
        }
        public static void LogCalloutanaSide(string message)
        {
            LogSide(message, "calloutanalysis");
        }
        public static void LogDownSide(string message)
        {
            LogSide(message, "down");
        }
        public static List<string> GetAllCallin()
        {
            List<string> listRet = new List<string>();
            string logFilePath = GetLogFile("callin");
            if (!File.Exists(logFilePath))
            {
                return listRet;
            }

            try
            {
                using (StreamReader sr = new StreamReader(logFilePath, true))
                {
                    while (sr.Peek() >= 0)
                    {
                        listRet.Add(sr.ReadLine());
                    }
                }
            }
            catch(Exception ex)
            {
                System.Diagnostics.EventLog.WriteEntry("MQTTServerSideAPI", DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss fff") + " " + ex.ToString(), System.Diagnostics.EventLogEntryType.Error);
            }
            
            return listRet;
        }

        public static List<string> GetFilterCallin(string productid, string devicename)
        {
            //1. get all 
            //2. filter
            List<string> alllogs = GetAllCallin();

            IEnumerable<string> filterExp = alllogs.Where((log) => {
                String[] seps = { " - " };
                string[] part2arr = log.Split(seps, StringSplitOptions.RemoveEmptyEntries);
                if(part2arr.Length > 1)
                {
                    if (part2arr[1].StartsWith("productid:" + productid + ",devicename:" + devicename + ","))
                        return true;
                    else
                        return false;
                }

                return false; 
            });

            return filterExp.ToList();
        }
    }
}