using System;
using System.IO;
using System.Windows.Forms;
using System.Drawing;

namespace VisualScriptEditor
{
    public partial class Form1 : Form
    {
        private string currentFileName = "";

        public Form1()
        {
            InitializeComponent();

            if (Properties.Settings.Default.CurrentFont != null && Properties.Settings.Default.CurrentForeColor != null)
            {
                txtFileContent.Font = Properties.Settings.Default.CurrentFont;
                txtFileContent.ForeColor = Properties.Settings.Default.CurrentForeColor;
            }
            else
            {
                Properties.Settings.Default.CurrentFont = new Font("Courier New", 12);
                Properties.Settings.Default.CurrentForeColor = Color.Black;
            }
        }

        public void ShowLineNumbers()
        {
            Point point = new Point(0, 0);

            int firstIndex = txtFileContent.GetCharIndexFromPosition(point);
            int firstLine = txtFileContent.GetLineFromCharIndex(firstIndex);

            point.X = ClientRectangle.Width;
            point.Y = ClientRectangle.Height;

            int lastIndex = txtFileContent.GetCharIndexFromPosition(point);
            int lastLine = txtFileContent.GetLineFromCharIndex(lastIndex);

            txtLineNumber.SelectionAlignment = HorizontalAlignment.Center;

            txtLineNumber.Text = "";

            for (int i = firstLine; i <= lastLine + 1; i++)
            {
                txtLineNumber.Text += i + 1 + "n";
            }
        }

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            txtFileContent.Clear();
        }

        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog fileDialog = new OpenFileDialog();
            fileDialog.Filter = "Visual Scripts Files | *.vscript";
            fileDialog.Title = "Open file";

            if (fileDialog.ShowDialog() == DialogResult.OK)
            {
                currentFileName = fileDialog.FileName;

                StreamReader reader = new StreamReader(fileDialog.FileName);
                txtFileContent.Text = reader.ReadToEnd();
                reader.Close();
            }
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (File.Exists(currentFileName))
            {
                StreamWriter writer = new StreamWriter(currentFileName);
                writer.Write(txtFileContent.Text);
                writer.Close();
            }
            else
            {
                SaveFileDialog fileDialog = new SaveFileDialog();
                fileDialog.Filter = "Visual Script Files | *.vscript";
                fileDialog.Title = "Save File";

                if (fileDialog.ShowDialog() == DialogResult.OK)
                {
                    currentFileName = fileDialog.FileName;

                    StreamWriter writer = new StreamWriter(fileDialog.FileName);
                    writer.Write(txtFileContent.Text);
                    writer.Close();
                }
            }
        }

        private void undoToolStripMenuItem_Click(object sender, EventArgs e)
        {
            txtFileContent.Undo();
        }

        private void redoToolStripMenuItem_Click(object sender, EventArgs e)
        {
            txtFileContent.Redo();
        }

        private void cutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            txtFileContent.Cut();
        }

        private void copyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            txtFileContent.Copy();
        }

        private void pasteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            txtFileContent.Paste();
        }

        private void selectAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            txtFileContent.SelectAll();
        }

        private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog fileDialog = new SaveFileDialog();
            fileDialog.Filter = "Visual Script Files | *.vscript";
            fileDialog.Title = "Save As";

            if (fileDialog.ShowDialog() == DialogResult.OK)
            {
                currentFileName = fileDialog.FileName;

                StreamWriter writer = new StreamWriter(fileDialog.FileName);
                writer.Write(txtFileContent.Text);
                writer.Close();
            }
        }

        private void fontsColorsToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            FontDialog fontDialog = new FontDialog();

            fontDialog.ShowColor = true;
            fontDialog.ShowHelp = false;
            fontDialog.ShowApply = false;
            fontDialog.ShowEffects = false;

            fontDialog.Font = Properties.Settings.Default.CurrentFont;
            fontDialog.Color = Properties.Settings.Default.CurrentForeColor;

            if (fontDialog.ShowDialog() == DialogResult.OK)
            {
                Properties.Settings.Default.CurrentFont = fontDialog.Font;
                Properties.Settings.Default.CurrentForeColor = fontDialog.Color;

                Properties.Settings.Default.Save();

                txtFileContent.Font = fontDialog.Font;
                txtFileContent.ForeColor = fontDialog.Color;
            }
        }

        private void txtLineNumber_Enter(object sender, EventArgs e)
        {

        }

        private void txtLineNumber_Leave(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            txtFileContent.AppendText(Environment.NewLine);
            txtFileContent.AppendText(Environment.NewLine);

            txtLineNumber.Font = txtFileContent.Font;
            txtFileContent.Select();
            ShowLineNumbers();
        }

        private void Form1_Resize(object sender, EventArgs e)
        {
            ShowLineNumbers();
        }

        private void txtFileContent_SelectionChanged(object sender, EventArgs e)
        {
            Point point = txtFileContent.GetPositionFromCharIndex(txtFileContent.SelectionStart);
            if (point.X == 1)
            {
                ShowLineNumbers();
            }
        }

        private void txtFileContent_VScroll(object sender, EventArgs e)
        {
            txtLineNumber.Text = "";
            ShowLineNumbers();
            txtLineNumber.Invalidate();
        }

        private void txtFileContent_TextChanged(object sender, EventArgs e)
        {
            if (txtFileContent.Text == "")
            {
                ShowLineNumbers();
            }
        }

        private void txtFileContent_FontChanged(object sender, EventArgs e)
        {
            txtLineNumber.Font = txtFileContent.Font;
            txtFileContent.Select();
            ShowLineNumbers();
        }

        private void txtLineNumber_MouseDown(object sender, MouseEventArgs e)
        {
            txtFileContent.Select();
            txtLineNumber.DeselectAll();
        }
    }
}