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;

namespace MatrixCalculator
{
    public partial class ImportCsvWindow : Form
    {
        private string csv;
        private bool allowExit = true;

        #region Public properties
        public int StartRow { get; set; }
        public int StartCol { get; set; }
        public int EndRow { get; set; }
        public int EndCol { get; set; }

        public string Csv{
            get { return csv; }
            set { csv = value; UpdateGrid(); }
        }

        public string MatrixName {
            get {
                return inputName.Text;
            }

            set {
                inputName.Text = value;
            }
        }

        public MathNet.Numerics.LinearAlgebra.Matrix<double> Matrix
        {
            get { return GridViewHelper.GetMatrix(dataGrid); }
            set { GridViewHelper.PutMatrix(value, dataGrid); }
        }
        #endregion

        private Dictionary<char, bool> separators = new Dictionary<char,bool>();

        public ImportCsvWindow()
        {
            InitializeComponent();

            separators.Add(',', true);
            separators.Add('\t', false);
            separators.Add(' ', false);
            separators.Add(';', false);
        }

        public void LoadFile(string filename)
        {
            if (System.IO.File.Exists(filename))
                Csv = System.IO.File.ReadAllText(filename);
        }

        private void UpdateGrid()
        {
            List<char> sep = new List<char>();
            foreach (var i in separators)
                if (i.Value) sep.Add(i.Key);

            // Update data
            dataGrid.DataSource = CsvParser.GetTable(Csv, sep.ToArray(), checkCombine.Checked);

            foreach (DataGridViewColumn i in dataGrid.Columns)
            {
                i.HeaderText = "";
                i.AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
            }

            // Update sizes
            inputStartRow.Value = 0;
            inputStartColumn.Value = 0;
            inputEndColumn.Value = inputEndColumn.Maximum = dataGrid.Columns.Count - 1;
            inputEndRow.Value = inputEndRow.Maximum = dataGrid.Rows.Count - 1;
        }

        #region Separators
        private void checkCombine_CheckedChanged(object sender, EventArgs e)
        {
            UpdateGrid();
        }

        private void checkSepComma_CheckedChanged(object sender, EventArgs e)
        {
            separators[','] = checkSepComma.Checked;
            UpdateGrid();
        }

        private void checkSepSemicolon_CheckedChanged(object sender, EventArgs e)
        {
            separators[';'] = checkSepComma.Checked;
            UpdateGrid();
        }

        private void checkSepSpace_CheckedChanged(object sender, EventArgs e)
        {
            separators[' '] = checkSepComma.Checked;
            UpdateGrid();
        }

        private void checkSepOthers_CheckedChanged(object sender, EventArgs e)
        {
            List<char> temp = new List<char>();
            foreach (var i in separators)
                if (i.Key != ' ' && i.Key != '\t' && i.Key != ';' && i.Key != ',')
                    temp.Add(i.Key);

            foreach (var i in temp) separators[i] = false;

            if (checkSepOthers.Checked)
                foreach (var i in inputSepOthers.Text)
                    separators[i] = true;

            UpdateGrid();
        }

        private void checkSepTab_CheckedChanged(object sender, EventArgs e)
        {
            separators['\t'] = checkSepComma.Checked;
            UpdateGrid();
        }

        private void inputSepOthers_TextChanged(object sender, EventArgs e)
        {
            List<char> temp = new List<char>();
            foreach (var i in separators)
                if (i.Key != ' ' && i.Key != '\t' && i.Key != ';' && i.Key != ',')
                    temp.Add(i.Key);

            foreach (var i in temp) separators[i] = false;

            if (checkSepOthers.Checked)
                foreach (var i in inputSepOthers.Text)
                    separators[i] = true;

            UpdateGrid();
        }
        #endregion

        #region Form buttons
        private void buttonEntire_Click(object sender, EventArgs e)
        {
            StartCol = StartRow = 0;
            inputEndColumn.Value = dataGrid.Columns.Count - 1;
            inputEndRow.Value = dataGrid.Rows.Count - 1;

            this.DialogResult = System.Windows.Forms.DialogResult.OK;
            this.Close();
        }

        private void buttonAccept_Click(object sender, EventArgs e)
        {
            // Get numbers
            StartCol = Convert.ToInt32(inputStartColumn.Value);
            StartRow = Convert.ToInt32(inputStartRow.Value);
            EndCol = Convert.ToInt32(inputEndColumn.Value);
            EndRow = Convert.ToInt32(inputEndRow.Value);

            // Validate input
            if (inputName.Text == "")
            {
                allowExit = false;
                MessageBox.Show("Name cannot be empty!", "Error!");
                return;
            }

            if (EndCol - StartCol <= 0 || EndRow - StartRow <= 0)
            {
                allowExit = false;
                MessageBox.Show("Invalid range, the matrix must have at least one row and one column.", "Error!");
                return;
            }

            // Trim unneeded rows and columns
            while (StartCol > 0) {
                dataGrid.Columns.RemoveAt(0);
                StartCol--;
                EndCol--;
            }

            while (StartRow > 0) {
                dataGrid.Rows.RemoveAt(0);
                StartRow--;
                EndRow--;
            }

            GridViewHelper.Resize(dataGrid, EndCol + 1, EndRow + 1);

            // Done, finish
            this.DialogResult = System.Windows.Forms.DialogResult.OK;
            this.Close();
        }

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

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

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