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

namespace File_Browser
{
    public partial class TextEditor : Form
    {
        FileStream fileStream;
        Byte[] dataBytes;
        string fileName;

        public TextEditor()
        {
            InitializeComponent();
        }

        public void loadTextEditor(string file)
        {
            fileName = file;
            StreamReader streamReader;
            string line;
            this.Text += " - Editing " + fileName;
            try {
                richTextBox1.Text = "";
                streamReader = new StreamReader(fileName);
                line = streamReader.ReadToEnd();
                richTextBox1.Text = line;
                streamReader.Close();
            } catch (Exception ex) {
                MessageBox.Show("Error Reading File: " + ex.StackTrace);
                this.Close();
            }
        }

        private void SaveButton_Click(object sender, EventArgs e)
        {
            if (richTextBox1.Text.Length > 0)
            {
                try {
                    fileStream = new FileStream(fileName, FileMode.OpenOrCreate);
                    dataBytes = Encoding.ASCII.GetBytes(richTextBox1.Text);
                    fileStream.Write(dataBytes, 0, dataBytes.Length);
                    fileStream.Close();
                    MessageBox.Show("Successfully Saved");
                } catch (Exception err) {
                    MessageBox.Show(err.Message);
                }

            }
        }

        private void AppendButton_Click(object sender, EventArgs e)
        {
            if (richTextBox1.Text.Length > 0)
            {
                try
                {
                    fileStream = new FileStream(fileName, FileMode.Append);
                    dataBytes = Encoding.ASCII.GetBytes(richTextBox1.Text);
                    fileStream.Write(dataBytes, 0, dataBytes.Length);
                    fileStream.Close();
                    MessageBox.Show("Successfully Appended");
                }
                catch (Exception err)
                {
                    MessageBox.Show(err.Message);
                }

            }
        }

        private void SplitButton_Click(object sender, EventArgs e)
        {
            string text;
            string[] words;
            if (richTextBox1.Text.Length > 0)
            {
                string split = Microsoft.VisualBasic.Interaction.InputBox("Iveskite simbolį pagal kurį išskirti");
                text = richTextBox1.Text;
                words = text.Split(split[0]);
                richTextBox1.Text = "";
                foreach (string item in words)
                {
                    richTextBox1.Text += (item + Environment.NewLine);
                }
            }
        }

        private void SubstringButton_Click(object sender, EventArgs e)
        {
            string text;
            if (richTextBox1.Text.Length > 4)
            {
                text = richTextBox1.Text;
                string pos1 = Microsoft.VisualBasic.Interaction.InputBox("Iveskite pradžios poziciją");
                string pos2 = Microsoft.VisualBasic.Interaction.InputBox("Iveskite pabaigos poziciją");
                try
                {
                    richTextBox1.Text = text.Substring(Int32.Parse(pos1), Int32.Parse(pos2));
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Error while substringing: " + ex.Message);
                }
            }
        }

        private void SearchButton_Click(object sender, EventArgs e)
        {
            string text;
            if (richTextBox1.Text.Length > 0)
            {
                text = richTextBox1.Text;
                string ats = Microsoft.VisualBasic.Interaction.InputBox("Iveskit teksta kurio ieskosite");
                if (text.Contains(ats))
                {
                    int pos = text.IndexOf(ats);
                    richTextBox1.Focus();
                    richTextBox1.Select(pos, ats.Length);
                }
                else
                {
                    MessageBox.Show("Ieškomos frazės nėra");
                }
            }
        }

        private void ReplaceButton_Click(object sender, EventArgs e)
        {
            string text;
            if (richTextBox1.Text.Length > 0)
            {
                text = richTextBox1.Text;
                string ats = Microsoft.VisualBasic.Interaction.InputBox("Iveskit teksta kuri pakeisite");
                string repl = Microsoft.VisualBasic.Interaction.InputBox("Iveskit teksta kuriuo pakeisite");
                if (text.Contains(ats))
                {
                    richTextBox1.Text = text.Replace(ats, repl);
                }
                else
                {
                    MessageBox.Show("Keičiamo teksto nėra");
                }
            }
        }
    }
}