using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MathNet.Numerics.LinearAlgebra;

namespace MatrixCalculator
{
    static class GridViewHelper
    {
        /// <summary>
        /// Loads a matrix in a DataGridView
        /// </summary>
        public static void PutMatrix(Matrix<double> m, DataGridView grid)
        {
            // Reset grid
            grid.Rows.Clear();
            grid.Columns.Clear();

            // Add columns
            for (int i = 0; i < m.ColumnCount; i++)
            {
                var col = new DataGridViewTextBoxColumn()
                {
                    SortMode = DataGridViewColumnSortMode.NotSortable,
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells
                };

                grid.Columns.Add(col);
            }

            // Add rows and data
            for (int i = 0; i < m.RowCount; i++)
            {
                grid.Rows.Add();

                for (int j = 0; j < m.ColumnCount; j++)
                    grid[j, i].Value = MyDouble.String(m[i, j]);
            }
        }

        /// <summary>
        /// Gets the matrix from a DataGridView
        /// </summary>
        public static Matrix<double> GetMatrix(DataGridView grid)
        {
            Matrix<double> m = Matrix<double>.Build.Dense(grid.Rows.Count, grid.Columns.Count);

            for (int i = 0; i < m.RowCount; i++)
                for (int j = 0; j < m.ColumnCount; j++)
                {
                    double temp = 0;
                    
                    if (grid[j, i].Value != null)
                        double.TryParse(grid[j, i].Value.ToString(), out temp);

                    m[i, j] = temp;
                }

            return m;
        }

        /// <summary>
        /// Resizes a DataGridView
        /// </summary>
        /// <param name="grid">The DataGridView</param>
        /// <param name="ncols">The new number of columns</param>
        /// <param name="nrows">The new number of rows</param>
        public static void Resize(DataGridView grid, int ncols, int nrows)
        {
            // Add columns
            while (grid.Columns.Count < ncols)
            {
                DataGridViewTextBoxColumn col = new DataGridViewTextBoxColumn()
                {
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells,
                    SortMode = DataGridViewColumnSortMode.NotSortable
                };

                grid.Columns.Add(col);
            }

            // Remove columns
            while (grid.Columns.Count > ncols)
                grid.Columns.Remove(grid.Columns.GetLastColumn(DataGridViewElementStates.Displayed, DataGridViewElementStates.None));

            // Add rows
            while (grid.Rows.Count < nrows)
                grid.Rows.Add();

            // Remove rows
            while (grid.Rows.Count > nrows)
                grid.Rows.RemoveAt(grid.Rows.GetLastRow(DataGridViewElementStates.Displayed));
        }

        /// <summary>
        /// Copies the selected area to clipboard
        /// </summary>
        public static void CopySelected(DataGridView grid)
        {
            int minRow, minCol, maxRow, maxCol;
            minRow = minCol = int.MaxValue;
            maxRow = maxCol = int.MinValue;

            foreach (DataGridViewCell i in grid.SelectedCells)
            {
                minRow = Math.Min(minRow, i.RowIndex);
                minCol = Math.Min(minCol, i.ColumnIndex);
                maxRow = Math.Max(maxRow, i.RowIndex);
                maxCol = Math.Max(maxCol, i.ColumnIndex);
            }

            string csv = CsvParser.ToCSV(grid, minRow, minCol, maxRow, maxCol, true);
            Clipboard.SetText(csv, TextDataFormat.CommaSeparatedValue);
        }

        /// <summary>
        /// Pastes clipboard content into selected cell and beyond
        /// </summary>
        public static void Paste(DataGridView grid)
        {
            // Where to paste
            int row = 0, col = 0;
            if (grid.CurrentCell != null) {
                row = grid.CurrentCell.RowIndex;
                col = grid.CurrentCell.ColumnIndex;
            }

            // Get data
            string data = "";
            if (Clipboard.ContainsText(TextDataFormat.CommaSeparatedValue)) data = Clipboard.GetText(TextDataFormat.CommaSeparatedValue);
            else if (Clipboard.ContainsText()) data = Clipboard.GetText();

            var table = CsvParser.GetTable(data, MatrixCalculator.Properties.Settings.Default.InternalCsvSeparators.ToArray());

            // Put data in table
            for (int i = 0; i < table.Rows.Count; i++)
                for (int j = 0; j < table.Columns.Count; j++)
                    if (table.Rows[i][j].ToString() != "" && row + i < grid.Rows.Count && col + j < grid.Columns.Count)
                        grid[j + col, i + row].Value = table.Rows[i][j];
        }
    }
}