using System;
using System.Text;
using System.IO;

namespace SafeMobileLib
{
    public class GenerateConfigFiles
    {
        static string CR = Environment.NewLine;

        public static void CreateAndCopyPostgresqlConfMaster(string masterIP, string appPath)
        {
            StringBuilder createText = new StringBuilder(4096);
            string path = appPath;

            // This text is added only once to the file.
            if (File.Exists(path))
                File.Delete(path);


            createText.Append($"listen_addresses = '*'{CR}port = 5432{CR}max_connections = 1000{CR}shared_buffers = 32MB{CR}");
            createText.Append($"datestyle = 'iso, mdy'{CR}lc_messages = 'English_United States.1252'{CR}lc_monetary = 'English_United States.1252'{CR}");
            createText.Append($"lc_numeric = 'English_United States.1252'{CR}lc_time = 'English_United States.1252'{CR}default_text_search_config = 'pg_catalog.english'");
            createText.Append($"{CR}{CR}wal_level = hot_standby{CR}max_wal_senders = 3{CR}wal_keep_segments = 500{CR}wal_log_hints = on{CR}");
            createText.Append($"max_replication_slots = 1{CR}archive_mode = on{CR}archive_command = 'copy \"%p\" \"\\\\\\\\{masterIP}\\\\archive_folder\\\\%f\"'{CR}archive_timeout = 0");

            // write to file
            File.WriteAllText(path, createText.ToString());
            
            // Show the content file to the console.
            string readText = File.ReadAllText(path);
            Console.WriteLine(readText);

            Utils.WriteLine("File successfuly written to: " + path, ConsoleColor.DarkCyan);
        }

        public static void CreateAndCopyHbaConf(string slaveIP, string appPath)
        {
            string path = appPath;

            // This text is added only once to the file.
            if (File.Exists(path))
                File.Delete(path);


            string createText = $"host    all         all         127.0.0.1/32          md5{CR}host    all         all         0.0.0.0/0             md5{CR}" +
                                $"host    all         all         ::1/128               md5{CR}host 	replication	postgres	{slaveIP}/32		  trust";
            File.WriteAllText(path, createText);


            // Show the content file to the console.
            string readText = File.ReadAllText(path);
            Console.WriteLine(readText);

            Utils.WriteLine("File successfuly written to: " + path, ConsoleColor.DarkCyan);
        }


        public static void CreateAndCopyPostgresqlConfSlave(string appPath)
        {
            string path = appPath;
            StringBuilder createText = new StringBuilder(4096);

            // This text is added only once to the file.
            if (File.Exists(path))
                File.Delete(path);


            createText.Append($"listen_addresses = '*'{CR}port = 5432{CR}max_connections = 1000{CR}shared_buffers = 32MB{CR}");
            createText.Append($"datestyle = 'iso, mdy'{CR}lc_messages = 'English_United States.1252'{CR}lc_monetary = 'English_United States.1252'{CR}");
            createText.Append($"lc_numeric = 'English_United States.1252'{CR}lc_time = 'English_United States.1252'{CR}default_text_search_config = 'pg_catalog.english'");
            createText.Append($"{CR}{CR}wal_level = hot_standby{CR}max_wal_senders = 3{CR}wal_keep_segments = 500{CR}");
            createText.Append($"max_replication_slots = 1{CR}hot_standby = on{CR}log_destination = stderr{CR}logging_collector = on");
       

            File.WriteAllText(path, createText.ToString());

            // Show the content file to the console.
            string readText = File.ReadAllText(path);
            Console.WriteLine(readText);

            Utils.WriteLine("File successfuly written to: " + path, ConsoleColor.DarkCyan);
        }



        public static void CreateRecoveryConf(string masterIP, string path, string safemobilePath)
        {
            StringBuilder createText = new StringBuilder(4096);


            // This text is added only once to the file.
            if (File.Exists(path))
                File.Delete(path);


            createText.Append($"standby_mode = 'on'{CR}primary_conninfo = 'host = {masterIP} port = 5432 user = postgres password = wizdemo26'{CR}");
            createText.Append($"primary_slot_name = 'replication_slot_node'{CR}restore_command = 'copy \"\\\\\\\\{masterIP}\\\\archive_folder\\\\%f\" \"%p\"'{CR}");
            createText.Append($"trigger_file = '{safemobilePath.Replace(@"\", "/")}/failover.txt'{CR}");
            createText.Append($"recovery_target_timeline = 'latest'");

            File.WriteAllText(path, createText.ToString());


            // Open the file to read from.
            string readText = File.ReadAllText(path);
            Console.WriteLine(readText);

            Utils.WriteLine("File successfuly written to: " + path, ConsoleColor.DarkCyan);
        }


        public static string CheckCurrentConfiguration(string appPath)
        {
            string line;
            bool valid = false;
            bool has_hot_standby = false;

            using (StreamReader file = new StreamReader(appPath))
            {
                while ((line = file.ReadLine()) != null)
                {
                    if (line.Replace(" ", "").Contains("max_replication_slots"))
                            valid = true;

                    if (line.Replace(" ", "").Equals("hot_standby=on"))
                        has_hot_standby = true;
                }

                if (!valid)
                    return string.Empty;

                if (has_hot_standby)
                    return "slave";

                return "master";
            }
        }
    }
}