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

namespace Volian.Controls.Library
{
    //C2025-023 Electronic Procedures
    //Control for designating which cells in a table require EP input 
    public partial class TablePropertiesControl : UserControl
    {
        //defines the type of possible inputs from an EP viewer
        public enum EPinputtype
        {
            none,
            textbox,
            checkbox
        };

        private DataTable values;
        private BindingSource bindingSource = null;
        private int totalrows = 1;
        private int totalcols = 1;
        public readonly string epname;
        private bool IsInitializing;

        //initialization / data will be in the format:
        // totalnumrows,totalnumcols;(row,col):value|(row,col):value...
        public TablePropertiesControl(string name, string title, string initialvalues)
        {
            InitializeComponent();

            IsInitializing = true;

            epname = name;
            lbltitle.Text = title;
            initializevalues(initialvalues);
            bindingSource = new BindingSource(values, "");
            dataview.DataSource = bindingSource;
            dataview.AutoGenerateColumns = false;

            Load += new EventHandler(FormLoad_setDefaults);
        }

        //initialization / data will be in the format:
        // totalnumrows,totalnumcols;(row,col):value|(row,col):value...
        private void initializevalues(string initialvalues)
        {
            values = new DataTable("values");

            if (!string.IsNullOrEmpty(initialvalues))
            {
                string[] grp = initialvalues.Split(';');
                string[] total = grp[0].Split(',');
                initializedt(int.Parse(total[0]), int.Parse(total[1]));

                string[] ivs = grp[1].Split('|');
                //pair will be of format:
                //(row,col):value
                foreach (string pair in ivs)
                {
                    Match m = Regex.Match(pair, @"\(([\d]),([\d])\):([\w]+)");
                    if (m.Success)
                    {
                        int row = int.Parse(m.Groups[1].Value);
                        int col = int.Parse(m.Groups[2].Value);
                        string v = m.Groups[3].Value;
                        values.Rows[row][col] = v;
                    }

                }

                values.AcceptChanges();
            }
            else
            {
                initializedt(1, 1);
            }
        }

        //initialize the blank datatable
        private void initializedt(int numrows, int numcols)
        {
            totalrows = numrows;
            totalcols = numcols;

            for (int c = 0; c < totalcols; c++)
            {
                values.Columns.Add(new DataColumn($"Column{c}") { DefaultValue = "none" });
            }

            for (int rw = 0; rw < totalrows; rw++)
            {
                values.Rows.Add();
            }

        }

        void FormLoad_setDefaults(object sender, EventArgs e)
        {
            BindingSource bindingSourceDropDown = new BindingSource();
            bindingSourceDropDown.DataSource = Enum.GetNames(typeof(EPinputtype));

            //in order to achieve a dropdown of possible values need
            //to remove the auto-inserted columns
            //that were auto-generated of type type text
            //when values was bound to the datagrid
            for (int c = 0; c < totalcols; c++)
            {
                dataview.Columns.RemoveAt(c);
                var cName = new DataGridViewComboBoxColumn();
                cName.DataSource = bindingSourceDropDown;
                cName.DefaultCellStyle.NullValue = "none";
                dataview.Columns.Insert(c, cName);
            }

            NumRows.Value = totalrows;
            NumCols.Value = totalcols;
            IsInitializing = false;
            setDataViewtoValues();

        }

        //set the display cells to match the values in the datatable for initialization
        //and resize of the dataviewgrid
        void setDataViewtoValues()
        {
            if (!IsInitializing)
            {
                for (int c = 0; c < totalcols; c++)
                {
                    for (int rw = 0; rw < totalrows; rw++)
                    {
                        dataview.Rows[rw].Cells[c].Value = values.Rows[rw][c];
                    }
                }
            }
        }

        //Get storage string for storing table values in db
        // data will be returned in the format:
        // totalnumrows,totalnumcols;(row,col):value|(row,col):value...
        public string GetStorageValue()
        {
            //force any in progress editing to commit.
            ((BindingSource)dataview.DataSource).EndEdit();

            StringBuilder bldr = new StringBuilder();
            bldr.Append($"{totalrows},{totalcols}");
            List<string> points = new List<string>();
            for (int rw = 0; rw < values.Rows.Count; rw++)
            {
                for (int col = 0; col < values.Columns.Count; col++)
                {
                    if ((string) values.Rows[rw][col] != "none")
                        points.Add($"({rw},{col}):{values.Rows[rw][col]}");
                }
            }


            if (points.Count > 0)
            {
                bldr.Append(";");
                bldr.Append(string.Join("|", points));
            }

            return bldr.ToString();
        }

        private void NumRows_ValueChanged(object sender, EventArgs e)
        {
            int endNumRows = (int)NumRows.Value;
            int curNumRows = totalrows;

            //remove rows till equal
            while (curNumRows > endNumRows)
            {
                values.Rows.RemoveAt(curNumRows - 1);
                curNumRows--;
            }
            //add rows till equal
            while (curNumRows < endNumRows)
            {
                values.Rows.Add();
                curNumRows++;
            }

            totalrows = endNumRows;
            setDataViewtoValues();
        }

        private void NumCols_ValueChanged(object sender, EventArgs e)
        {
            int endNumCols = (int)NumCols.Value;
            int curNumCols = totalcols;

            BindingSource bindingSourceDropDown = new BindingSource();
            bindingSourceDropDown.DataSource = Enum.GetNames(typeof(EPinputtype));

            //remove cols till equal
            while (curNumCols > endNumCols)
            {
                values.Columns.RemoveAt(curNumCols - 1);
                dataview.Columns.RemoveAt(curNumCols - 1);
                curNumCols--;
            }
            //add cols till equal
            while (curNumCols < endNumCols)
            {
                values.Columns.Add(new DataColumn($"Column{curNumCols + 1}") { DefaultValue = "none"});
                if (dataview.Columns.Count > curNumCols) dataview.Columns.RemoveAt(curNumCols);
                var cName = new DataGridViewComboBoxColumn();
                cName.DataSource = bindingSourceDropDown;
                cName.DefaultCellStyle.NullValue = "none";
                dataview.Columns.Add(cName);

                curNumCols++;
            }

            totalcols = endNumCols;
            setDataViewtoValues();
        }

        //set the datatable value to match the changed datagridview value
        //for some reason despite being bound, does not automatically update 
        // (it may be that datatable as a bindingsource does not implement INotifyProperty
        //  and thus needs manually set like this)
        private void dataview_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            values.Rows[e.RowIndex][e.ColumnIndex] = (string) dataview.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
        }
    }

}