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

namespace MatrixCalculator
{
    public partial class Editor : Form
    {
        bool allowExit = true;

        #region Setters and getters
        public string MatrixName {
            get { return inputName.Text;  }
            set { inputName.Text = value; }
        }

        public string MatrixDescription
        {
            get { return inputDescription.Text; }
            set { inputDescription.Text = value; }
        }

        public Matrix<double> Matrix
        {
            get { return GridViewHelper.GetMatrix(dataEditor); }
            set {
                GridViewHelper.PutMatrix(value, dataEditor);
                inputColumns.Value = value.ColumnCount;
                inputRows.Value = value.RowCount;
            }
        }
        #endregion

        #region Constructor
        public Editor()
        {
            InitializeComponent();

            inputName.Text = "New matrix ";
        }
        #endregion

        #region Resize buttons
        private void buttonResizeReset_Click(object sender, EventArgs e)
        {
            inputRows.Value = dataEditor.Rows.Count;
            inputColumns.Value = dataEditor.Columns.Count;
        }

        private void buttonResizeApply_Click(object sender, EventArgs e)
        {
            int rows = Convert.ToInt32(inputRows.Value);
            int cols = Convert.ToInt32(inputColumns.Value);

            GridViewHelper.Resize(dataEditor, cols, rows);
        }
        #endregion

        #region Form buttons
        private void buttonAccept_Click(object sender, EventArgs e)
        {
            this.DialogResult = System.Windows.Forms.DialogResult.OK;

            // Make sure name is not empty
            if (MatrixName == "")
            {
                allowExit = false;
                MessageBox.Show("You must enter a name!", "Error!");
            }

            // Make sure size is not empty! Empty matrices behave very weird
            else if (dataEditor.Columns.Count == 0 || dataEditor.Rows.Count == 0)
            {
                allowExit = false;
                MessageBox.Show("The matrix must have at least one row and one column!", "Error!");
            }
        }

        private void buttonCancel_Click(object sender, EventArgs e)
        {
            this.DialogResult = System.Windows.Forms.DialogResult.Cancel;
            this.Close();
        }
        #endregion

        #region Right click menu
        private void contextMenuCut_Click(object sender, EventArgs e)
        {
            GridViewHelper.CopySelected(dataEditor);

            foreach (DataGridViewCell i in dataEditor.SelectedCells) i.Value = "0";
        }

        private void contextMenuCopy_Click(object sender, EventArgs e)
        {
            GridViewHelper.CopySelected(dataEditor);
        }

        private void contextMenuPaste_Click(object sender, EventArgs e)
        {
            GridViewHelper.Paste(dataEditor);
        }

        private void contextMenuClear_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewCell i in dataEditor.SelectedCells) i.Value = "0";
        }

        private void contextMenuClearAll_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewRow i in dataEditor.Rows)
                foreach (DataGridViewCell j in i.Cells)
                    j.Value = "0";
        }

        private void contextMenuInsertRow_Click(object sender, EventArgs e)
        {
            if (dataEditor.CurrentCell != null) dataEditor.Rows.Insert(dataEditor.CurrentCell.RowIndex, new DataGridViewRow());
            else dataEditor.Rows.Add();
        }

        private void contextMenuInsertCol_Click(object sender, EventArgs e)
        {
            var col = new DataGridViewTextBoxColumn()
                {
                    SortMode = DataGridViewColumnSortMode.NotSortable,
                    AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCellsExceptHeader
                };

            if (dataEditor.CurrentCell != null) dataEditor.Columns.Insert(dataEditor.CurrentCell.ColumnIndex, col);
            else dataEditor.Columns.Add(col);
        }

        private void contextMenuDelRow_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewCell i in dataEditor.SelectedCells)
                dataEditor.Rows.RemoveAt(i.RowIndex);
        }

        private void contextMenuDelColumn_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewCell i in dataEditor.SelectedCells)
                dataEditor.Columns.RemoveAt(i.ColumnIndex);
        }
        #endregion

        #region Drawing
        protected override void OnPaintBackground(PaintEventArgs e)
        {
            DynamicLink.Controls.BackgroundGradient.Paint(e.Graphics, new Rectangle(-1, -1, this.Width, this.Height));
        }
        #endregion

        private void dataEditor_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.ColumnIndex < 0 || e.ColumnIndex >= dataEditor.Columns.Count) return;
            if (e.RowIndex < 0 || e.RowIndex >= dataEditor.Rows.Count) return;
            
            if (e.Button == System.Windows.Forms.MouseButtons.Right)
            {
                dataEditor.CurrentCell = dataEditor.Rows[e.RowIndex].Cells[e.ColumnIndex];
                if (dataEditor.ContextMenu != null) dataEditor.ContextMenu.Show(dataEditor, e.Location);
            }
        }

        private void Editor_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!allowExit)
            {
                allowExit = true;
                e.Cancel = true;
            }
        }
    }
}