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

namespace CopyAndEncodeImage {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        private void btnEncode_Click(object sender, EventArgs e) {
            if (!File.Exists(textBox1.Text)) {
                MessageBox.Show("The specified file does not exist.", "File Not Found", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            if (Path.GetExtension(textBox1.Text).ToLower() != ".png") {
                MessageBox.Show("Please select a valid PNG file.", "Invalid File", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            try {
                byte[] bytes = File.ReadAllBytes(textBox1.Text);
                string base64String = Convert.ToBase64String(bytes);
                string output = $"data:image/png;base64,{base64String}";
                Clipboard.SetText(output);
                MessageBox.Show("Image encoded and copied to clipboard successfully.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
            } catch (Exception ex) {
                MessageBox.Show($"An error occurred while encoding the image: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void btnChoose_Click(object sender, EventArgs e) {
            OpenFileDialog openFileDialog = new OpenFileDialog {
                Filter = "PNG Files|*.png",
                Title = "Select a PNG Image",
                FileName = string.IsNullOrEmpty(textBox1.Text) ? "" : textBox1.Text
            };
            if (openFileDialog.ShowDialog() == DialogResult.OK) {
                textBox1.Text = openFileDialog.FileName;
            }
        }

        private void textBox1_TextChanged(object sender, EventArgs e) {
            btnEncode.Enabled = !string.IsNullOrEmpty(textBox1.Text) && Path.GetExtension(textBox1.Text).ToLower() == ".png";
        }
    }
}