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 NoteBook1
{
    public partial class Form1 : Form
    {
        private bool isFilePass;
        private bool isFileSave;
        private bool isDirty;
        private string filePath;

        public Form1()
        {
            InitializeComponent();
        }

        private void MenuNewFileClick(object sender, EventArgs e)
        {
            if ((isFilePass && isFileSave) || (richTextBox1.Text == string.Empty))
            {
                richTextBox1.Text = string.Empty;
            }
            else
                NewFileMessage();
        }
        private void NewFileMessage()
        {
            SaveFileDialog saveAs = new SaveFileDialog();
            DialogResult dialogResult = MessageBox.Show("Do you want to save changes to file?", "My noteBook", MessageBoxButtons.YesNoCancel);
            if (DialogResult.Yes == dialogResult)
            {
                isFilePass = true;
                isFileSave = true;
                saveAs.ShowDialog();
                filePath = saveAs.FileName;
                SaverToFile();
                richTextBox1.Text = string.Empty;
            }
            else if (DialogResult.No == dialogResult)
            {
                richTextBox1.Text = string.Empty;
            }
            else { }
        }
        private void SaverToFile()
        {
            if (isFilePass)
            {
                using (StreamWriter saveToFile = new StreamWriter(filePath))
                {
                    saveToFile.WriteLine(richTextBox1.Text);
                }
            }
            else
                NewFileMessage();
        }

        private void richTextBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void MenuOpenFileClick(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            DialogResult dialogResult = openFileDialog.ShowDialog();
            if (DialogResult.OK == dialogResult)
            {
                isDirty = false;
                using (StreamReader readFromFile = new StreamReader(openFileDialog.FileName))
                {
                    richTextBox1.Text = readFromFile.ReadToEnd();
                }
                filePath = openFileDialog.FileName;
            }
        }

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (!isDirty)
                return;
            if (string.IsNullOrEmpty(filePath))
            {
                MenuSaveFileClick();
            }
        }
        private void MenuSaveFileClick()
        {
            if (isDirty)
            {
                SaveFileDialog saveAs = new SaveFileDialog();
                DialogResult dialogResult = saveAs.ShowDialog();
                if (DialogResult.OK == dialogResult)
                {
                    isFilePass = true;
                    isFileSave = true;
                    filePath = saveAs.FileName;
                    SaverToFile();
                }
            }
        }
    }
}