using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Mip
{
    public partial class frmChat : Form
    {
        public frmChat()
        {
            InitializeComponent();
        }

        string idUserKomu = "0";
        string idUserOd = "0";
        DateTime maxDateTime = DateTime.MinValue;
        //float pocet = 0;
        private void dataGridView3_CellClick(object sender, DataGridViewCellEventArgs e)
        {

            idUserKomu = dataGridView3.Rows[dataGridView3.CurrentRow.Index].Cells["IDUsers"].Value.ToString();
            idUserOd = classUser.ID.ToString();

            textBox3.Enabled = true;
            label1.Enabled = true;
            povolitrefresh = true;
            classUser.IndexChat = dataGridView3.CurrentRow.Index;
            refreshChatUsers();
            refreshListView();
        }

        private void frmChat_Load(object sender, EventArgs e)
        {
            refreshChatUsers();

            listView2.Columns.Add("Smer", 25,HorizontalAlignment.Center);
            listView2.Columns.Add("DatumCas", 80,HorizontalAlignment.Left);
            listView2.Columns.Add("Text", 350,HorizontalAlignment.Left);
            listView2.HeaderStyle = ColumnHeaderStyle.None;
            dataGridView3.ClearSelection();

            string cmd = "SELECT IFNULL(MAX(`DatumCas`),0) AS `posledny` FROM `mip`.`tabchat` WHERE `Komu` = " + classUser.ID.ToString() + ";";
            string strPoslednyDatum;
            classSQL.SQL(cmd, out strPoslednyDatum);
            if (strPoslednyDatum != "0") maxDateTime = Convert.ToDateTime(strPoslednyDatum);
            
            Timer refresh = new Timer();
            refresh.Enabled = true;
            refresh.Interval = 1000;
            refresh.Tick += new System.EventHandler(refresh_Tick);
                       
            
        }

        private void refresh_Tick(object sender, EventArgs e)
        {
            if (dataGridView3.SelectedRows.Count > 0)
            {
                refreshListView();
                //refreshChatUsers();
            }
                
        }
        //int selectedRow;
        private void refreshChatUsers()
        {
            /*
             SELECT CONCAT(IFNULL(`Titul`,''), ' ', `Priezvisko`, ' ', `Meno`) AS Meno,
			                `OnlineStatus`,
				            `IDUsers`
                           FROM `tabusers` ORDER BY `OnlineStatus` DESC, `Priezvisko`;
             
              
             */

            string cmd = @"SELECT CONCAT(IFNULL(`Titul`,''), ' ', `Priezvisko`, ' ', `Meno`) AS Meno,
			               `OnlineStatus`,
				            `IDUsers`,
				            IF((SELECT COUNT(`Od`) FROM `tabchat` WHERE(`Od` = `tabusers`.IDUsers AND `Komu` = " + classUser.ID.ToString() + @" AND `tabchat`.`Status` = 'Neprečítaná'))=0,'False','True') AS NoveSpravy
				         FROM `tabusers` ORDER BY `OnlineStatus` DESC, `Priezvisko`;";

            DataTable tblChat = new DataTable();
            classSQL.SQL(cmd, out tblChat);

            // vymaze uzivatela aby nemohol posielat spravy sam sebe
            DataRow[] drr = tblChat.Select("IDUsers=' " + classUser.ID.ToString() + " ' ");
            foreach (var row in drr) row.Delete();
            
            dataGridView3.DataSource = tblChat;
            dataGridView3.Columns["IDUsers"].Visible = false;
            dataGridView3.Columns["Meno"].HeaderText = "Meno";
            dataGridView3.Columns["OnlineStatus"].HeaderText = "Status";
            dataGridView3.Columns["NoveSpravy"].Visible = false;//pridane aby sme mohly oznacit od koho ma uzivatel nove spravy
            dataGridView3.AutoResizeColumns();
            dataGridView3.Columns["Meno"].Width = 125;

            dataGridView3.ClearSelection();
            if (classUser.IndexChat <= dataGridView3.Rows.Count - 1) dataGridView3.Rows[classUser.IndexChat].Selected = true;
            else if (dataGridView3.Rows.Count != 0) dataGridView3.Rows[dataGridView3.Rows.Count - 1].Selected = true;
            
        }

        private void refreshListView()
        {
            string cmd = "SELECT IFNULL(MAX(`DatumCas`),0) AS `posledny` FROM `mip`.`tabchat` WHERE `Komu` = " + classUser.ID.ToString() + ";";
            string strposlednyDatumNovy;
            classSQL.SQL(cmd, out strposlednyDatumNovy);
            DateTime novyHladanyMaxDateTime = DateTime.MinValue;
            //if (strposlednyDatumNovy != "0" || strposlednyDatumNovy !=null) novyHladanyMaxDateTime = Convert.ToDateTime(strposlednyDatumNovy);
            if (strposlednyDatumNovy != "") novyHladanyMaxDateTime = Convert.ToDateTime(strposlednyDatumNovy);

            if ((novyHladanyMaxDateTime > maxDateTime && dataGridView3.SelectedRows.Count >0 ) ||
                 povolitrefresh == true)
            {

                for (int i = listView2.Items.Count - 1; i >= 0; i--) listView2.Items[i].Remove();

                string cmd2 = @"SELECT `Od`,
                                      `Komu`,
                                       DATE_FORMAT (`DatumCas`, '%e' '.' '%c' '. - ' '%H' ':' '%i')  AS `DatCas`,
                                      `Text`, 
                                      `Status`,
                                      `IDChat` 
                               FROM `tabchat` 
                               WHERE ((`Od` = " + idUserOd + " AND `Komu` = " + idUserKomu + ") OR (`Od` = " + idUserKomu + " AND `Komu` = " + idUserOd + ")) ORDER BY `DatumCas`;";

                DataTable tbllistView = new DataTable();
                classSQL.SQL(cmd2, out tbllistView);
                //"↑↓"
                for (int i = 0; i < tbllistView.Rows.Count; i++)
                {
                    string smer = "";
                    string datumcas = "";
                    string text = "";

                    if (tbllistView.Rows[i].ItemArray[tbllistView.Columns["Od"].Ordinal].ToString() == idUserOd) smer = "↑";
                    else smer = "↓";
                    datumcas = tbllistView.Rows[i].ItemArray[tbllistView.Columns["DatCas"].Ordinal].ToString();
                    text = tbllistView.Rows[i].ItemArray[tbllistView.Columns["Text"].Ordinal].ToString();

                    addlistviewline(smer, datumcas, text);

                    if (tbllistView.Rows[i].ItemArray[tbllistView.Columns["Od"].Ordinal].ToString() == idUserOd) listView2.Items[listView2.Items.Count - 1].ForeColor = Color.Blue;
                    else
                    {
                        if (tbllistView.Rows[i].ItemArray[tbllistView.Columns["Status"].Ordinal].ToString() == "Neprečítaná")
                        {
                            string IDChat = tbllistView.Rows[i].ItemArray[tbllistView.Columns["IDChat"].Ordinal].ToString();
                            string cmd3 = @"UPDATE `mip`.`tabchat` SET `Status` = 'Prečítaná' WHERE `IDChat`=" + IDChat + ";";

                            classSQL.SQL(cmd3);
                            listView2.Items[listView2.Items.Count - 1].ForeColor = Color.Red;
                        }
                        else
                        {
                            listView2.Items[listView2.Items.Count - 1].ForeColor = Color.Black;
                        }
                    }
                }
                if (listView2.Items.Count > 0) listView2.Items[listView2.Items.Count - 1].EnsureVisible();
                if (strposlednyDatumNovy != "0") maxDateTime = Convert.ToDateTime(strposlednyDatumNovy);
                povolitrefresh = false;
            }
            
        }

        private void addlistviewline(String addsmer, String adddatumcas, String addtext)
        {
            ListViewItem newitem = new ListViewItem(addsmer);
            newitem.SubItems.Add(adddatumcas);
            newitem.SubItems.Add(addtext);
            listView2.Items.Add(newitem);
        }

        private void label3_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        bool vymazatText = false;
        bool povolitrefresh = false;
        private void textBox3_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == 13)
            {
                string cmd = @"INSERT INTO `mip`.`tabchat` (`Od`, `Komu`, `DatumCas`, `Text`, `Status`) VALUES ('"
                        + idUserOd + "', '"
                        + idUserKomu + "', "
                        + "NOW()" + ", '"
                        + textBox3.Text + "', "
                        + "'Neprečítaná');";
                
                classSQL.SQL(cmd);
                povolitrefresh = true;
                refreshListView();
                vymazatText = true;
                
            }
                       
           
        }

        private void textBox3_TextChanged(object sender, EventArgs e)
        {
            
        }

        private void textBox3_KeyUp(object sender, KeyEventArgs e)
        {
            if (vymazatText == true)
            {
                textBox3.Clear();
                vymazatText = false;
            }

        }

        private void frmChat_Leave(object sender, EventArgs e)
        {
            this.Close();
        }

        private void dataGridView3_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            classGlobal.SetCellColor(dataGridView3, e.ColumnIndex, e.RowIndex, e.Value.ToString());
        }

        private void dataGridView3_SelectionChanged(object sender, EventArgs e)
        {
            if(dataGridView3.SelectedRows.Count != 0) label1.Text = "Adresát:  " + dataGridView3.Rows[dataGridView3.SelectedRows[0].Index].Cells["Meno"].Value.ToString();

        }
        
    }
}