using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HanvonF710XAttendanceService
{
    class AttendanceMachineDAO
    {

        public void update(AttendanceMachine attendanceMachine, MySqlConnection connection) {
            string query = "UPDATE `hrms`.`attendance_machine` SET `machine_ip` = @machine_ip, `port_number` = @port_number, `machine_name` = @machine_name, `site_id` = @site_id, `status` = @status, `last_sync_date` = @last_sync_date  WHERE `machine_id` = @machine_id";
            MySqlCommand cmd = new MySqlCommand(query, connection);
            cmd.Parameters.AddWithValue("@machine_ip", attendanceMachine.MachineIp);
            cmd.Parameters.AddWithValue("@port_number", attendanceMachine.PortNumber);
            cmd.Parameters.AddWithValue("@machine_name", attendanceMachine.MachineName);
            cmd.Parameters.AddWithValue("@site_id", attendanceMachine.SiteId);
            cmd.Parameters.AddWithValue("@status", attendanceMachine.Status);
            cmd.Parameters.AddWithValue("@last_sync_date", attendanceMachine.LastSyncDate);
            cmd.Parameters.AddWithValue("@machine_id", attendanceMachine.MachineId);
           
            cmd.ExecuteNonQuery();
        }

        public List<AttendanceMachine> getAttendanceMachines(MySqlConnection connection, String siteId) {
            List<AttendanceMachine> attendanceMachines = null;
            using (var cmd = new MySqlCommand())
            {
                cmd.Connection = connection;
                cmd.CommandTimeout = 120;
                string typeClause = MachineScope.BuildMachineTypeWhereClause(cmd);
                cmd.CommandText = "SELECT * FROM hrms.attendance_machine WHERE site_id = @siteId AND " + typeClause;
                cmd.Parameters.AddWithValue("@siteId", siteId);
                using (var reader = cmd.ExecuteReader())
                {
                    if (reader != null)
                    {
                        attendanceMachines = getAttendanceMachineList(reader);
                    }
                }
            }
            return attendanceMachines ?? new List<AttendanceMachine>();
        }

        public List<AttendanceMachine> getAllAttendanceMachines(MySqlConnection connection)
        {
            List<AttendanceMachine> attendanceMachines = null;
            using (var cmd = new MySqlCommand())
            {
                cmd.Connection = connection;
                cmd.CommandTimeout = 120;
                string typeClause = MachineScope.BuildMachineTypeWhereClause(cmd);
                cmd.CommandText =
                    "SELECT machine_id, machine_ip, port_number, machine_name, site_id, status, last_sync_date " +
                    "FROM hrms.attendance_machine WHERE " + typeClause;

                using (var reader = cmd.ExecuteReader())
                {
                    if (reader != null)
                    {
                        attendanceMachines = getAttendanceMachineList(reader);
                    }
                }
            }

            return attendanceMachines ?? new List<AttendanceMachine>();
        }

        /// <summary>Normalize IP for comparison (trim + remove spaces) so "192.168. 0.50" matches "192.168.0.50".</summary>
        private static string NormalizeIp(string ip)
        {
            if (string.IsNullOrWhiteSpace(ip)) return "";
            return new string(ip.Trim().Where(c => !char.IsWhiteSpace(c)).ToArray());
        }

        public bool TryGetAttendanceMachineByIp(MySqlConnection connection, string machineIp, out AttendanceMachine machine, out string machineType)
        {
            machine = null;
            machineType = null;
            if (string.IsNullOrWhiteSpace(machineIp)) return false;

            string normalizedIp = NormalizeIp(machineIp);

            using (var cmd = new MySqlCommand())
            {
                cmd.Connection = connection;
                cmd.CommandTimeout = 60;
                string typeClause = MachineScope.BuildMachineTypeWhereClause(cmd, "machine_type", "mtype");
                cmd.CommandText =
                    "SELECT machine_id, machine_ip, port_number, machine_name, site_id, status, last_sync_date, machine_type " +
                    "FROM hrms.attendance_machine WHERE machine_ip = @machine_ip AND " + typeClause + " LIMIT 1";
                cmd.Parameters.AddWithValue("@machine_ip", machineIp);
                using (var reader = cmd.ExecuteReader())
                {
                    if (reader.Read())
                    {
                        FillMachineFromReader(reader, out machine, out machineType);
                        return true;
                    }
                }
            }

            using (var cmd = new MySqlCommand())
            {
                cmd.Connection = connection;
                cmd.CommandTimeout = 120;
                string typeClause = MachineScope.BuildMachineTypeWhereClause(cmd, "machine_type", "mtype2");
                cmd.CommandText =
                    "SELECT machine_id, machine_ip, port_number, machine_name, site_id, status, last_sync_date, machine_type " +
                    "FROM hrms.attendance_machine WHERE " + typeClause;
                using (var reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        string dbIp = reader.IsDBNull(1) ? "" : reader.GetString("machine_ip");
                        if (NormalizeIp(dbIp) == normalizedIp)
                        {
                            FillMachineFromReader(reader, out machine, out machineType);
                            return true;
                        }
                    }
                }
            }

            return false;
        }
        private static void FillMachineFromReader(MySqlDataReader reader, out AttendanceMachine machine, out string machineType)
        {
            machine = new AttendanceMachine(
                reader.IsDBNull(0) ? "" : reader.GetString("machine_id"),
                reader.IsDBNull(1) ? "" : reader.GetString("machine_ip"),
                reader.IsDBNull(2) ? default(int) : reader.GetInt16("port_number"),
                reader.IsDBNull(3) ? "" : reader.GetString("machine_name"),
                reader.IsDBNull(4) ? default(int) : reader.GetInt16("site_id"),
                reader.IsDBNull(5) ? "" : reader.GetString("status"),
                reader.IsDBNull(6) ? default(DateTime) : reader.GetDateTime("last_sync_date")
            );
            machineType = reader.IsDBNull(7) ? null : reader.GetString("machine_type");
        }

        private List<AttendanceMachine> getAttendanceMachineList(MySqlDataReader reader) {
            List<AttendanceMachine> attendanceMachines = new List<AttendanceMachine>();
            while (reader.Read()) {
                attendanceMachines.Add(toAttendanceMachine(reader));
            }
            return attendanceMachines;
        }

        private AttendanceMachine toAttendanceMachine(MySqlDataReader reader) {
            return new AttendanceMachine(
                    reader.IsDBNull(0) ? "" : reader.GetString("machine_id"),
                    reader.IsDBNull(1) ? "" : reader.GetString("machine_ip"),
                    reader.IsDBNull(2) ? default(int) : reader.GetInt16("port_number"),
                    reader.IsDBNull(3) ? "" : reader.GetString("machine_name"),
                    reader.IsDBNull(4) ? default(int) : reader.GetInt16("site_id"),
                    reader.IsDBNull(5) ? "" : reader.GetString("status"),
                    reader.IsDBNull(6) ? default(DateTime) : reader.GetDateTime("last_sync_date")
                   
                ) ;
        }

        public void UpdateTotalEmpInMachines(string machine_id, int total_users,MySqlConnection connection)
        {
            string query = "UPDATE `hrms`.`attendance_machine` SET `total_users` ="+ total_users + "  WHERE `machine_id` = '"+ machine_id+ "'";
            MySqlCommand cmd = new MySqlCommand(query, connection);
            cmd.ExecuteNonQuery();
        }


        public string CheckEmpInDB(string machine_id, int emp_cd, MySqlConnection connection)
        {
            string result = "FALSE";
            string query = "Select * from attendance_machine_user a where a.machine_id='"+ machine_id + "' and a.serial_number = "+ emp_cd + "";
            MySqlCommand cmd = new MySqlCommand(query, connection);          
            DataTable dt = new DataTable();
            MySqlDataAdapter MySqlAdt = new MySqlDataAdapter();
            MySqlAdt.SelectCommand = cmd;
            MySqlAdt.Fill(dt);
            if(dt.Rows.Count > 0)
            {
                result = "TRUE";
            }
            else
            {
                result = "FALSE";

            }

            return result;
        }
    }
    
}