using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;

namespace ConfigEditor
{
    public partial class MainForm: Form
    {
        private string opened_file = null;

        public MainForm()
        {
            InitializeComponent();
        }

        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog()
            {
                Title = "Выберите файл конфигурации",
                Filter = "Файл *.json|*.json",
                Multiselect = false
            };
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                opened_file = ofd.FileName;
                richTextBox1.Text = File.ReadAllText(ofd.FileName);
            }
        }

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            File.WriteAllText(opened_file, richTextBox1.Text);
        }

        private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd = new SaveFileDialog
            {
                Title = "Сохранить файл конфигурации",
                Filter = "Файл *.json|*.json"
            };
            if (sfd.ShowDialog() == DialogResult.OK)
                File.WriteAllText(sfd.FileName, richTextBox1.Text);
        }

        private void generateMD5ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            using (var md5 = MD5.Create())
            {
                using (FileStream stream = File.OpenRead(opened_file))
                    md5.ComputeHash(stream);
                
                StringBuilder sb = new StringBuilder();
                byte[] hash = md5.Hash;
                for (int i = 0; i < hash.Length; i++)
                    sb.Append(hash[i].ToString("x2"));

                Clipboard.SetText(sb.ToString());
                MessageBox.Show($"Hash successfully copied into your clipboard.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }

        private bool CheckChanges()
        {
            if (opened_file != null)
            {
                if (richTextBox1.Text != File.ReadAllText(opened_file))
                {
                    DialogResult result = MessageBox.Show("The document has been modified.\nDo you want to save your changes?", "Question", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
                    if (result == DialogResult.Yes)
                    {
                        File.WriteAllText(opened_file, richTextBox1.Text);
                        MessageBox.Show("File successfully saved.", "Info", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        return true;
                    }
                    else if (result == DialogResult.Cancel)
                        return false;
                }
            }
            return true;
        }

        private void closeFileToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (!CheckChanges())
                return;
            richTextBox1.Clear();
            opened_file = null;
        }

        private void closeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (!CheckChanges())
                return;
            Application.Exit();
        }

        private void MainForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (!CheckChanges())
                return;
            Application.Exit();
        }
    }
}