using System;
using System.Diagnostics;
using System.IO;
using System.Net.NetworkInformation;
using System.Windows.Forms;

namespace CramLinkClientGUI
{
    public partial class MainForm : Form
    {
        private Process vpnProcess;
        private System.Windows.Forms.Timer pingTimer = new System.Windows.Forms.Timer();

        public MainForm()
        {
            InitializeComponent();

            statusLabel.Text = "Disconnected";
            siteComboBox.Items.AddRange(new[]
            {
                "CramLink 1 - HQ",
                "CramLink 2 - N/A"
            });
            siteComboBox.SelectedIndex = 0;

            pingTimer.Interval = 5000;
            pingTimer.Tick += PingTargets;
        }

        private void connectButton_Click(object sender, EventArgs e)
        {
            if (vpnProcess != null && !vpnProcess.HasExited)
            {
                vpnProcess.Kill();
                vpnProcess.Dispose();
                vpnProcess = null;
                statusLabel.Text = "Disconnected";
                connectButton.Text = "Connect";
                logBox.AppendText("VPN disconnected.\r\n");
                pingTimer.Stop();
                return;
            }

            string configPath = "C:\\CramLinkVPN\\client.ovpn";
            string openvpnPath = "C:\\CramLinkVPN\\openvpn.exe";

            if (!File.Exists(configPath) || !File.Exists(openvpnPath))
            {
                MessageBox.Show("OpenVPN executable or config not found.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            vpnProcess = new Process();
            vpnProcess.StartInfo.FileName = openvpnPath;
            vpnProcess.StartInfo.Arguments = "--config \"" + configPath + "\"";
            vpnProcess.StartInfo.RedirectStandardOutput = true;
            vpnProcess.StartInfo.RedirectStandardError = true;
            vpnProcess.StartInfo.UseShellExecute = false;
            vpnProcess.StartInfo.CreateNoWindow = true;

            vpnProcess.OutputDataReceived += (s, args) => HandleVPNOutput(args.Data);
            vpnProcess.ErrorDataReceived += (s, args) => HandleVPNOutput(args.Data);

            vpnProcess.Start();
            vpnProcess.BeginOutputReadLine();
            vpnProcess.BeginErrorReadLine();

            connectButton.Text = "Disconnect";
            statusLabel.Text = "Connecting...";
            logBox.AppendText("Connecting to VPN...\r\n");
        }

        private void HandleVPNOutput(string data)
        {
            if (data == null) return;
            Invoke(new Action(() =>
            {
                logBox.AppendText(data + "\r\n");
                if (data.Contains("Initialization Sequence Completed"))
                {
                    statusLabel.Text = "Connected";
                    pingTimer.Start();
                }
            }));
        }

        private void PingTargets(object sender, EventArgs e)
        {
            bool piOnline = PingHost("192.168.0.53");
            bool plcOnline = PingHost("192.168.0.98");
            piStatus.ForeColor = piOnline ? System.Drawing.Color.Green : System.Drawing.Color.Red;
            plcStatus.ForeColor = plcOnline ? System.Drawing.Color.Green : System.Drawing.Color.Red;
        }

        private bool PingHost(string host)
        {
            try
            {
                using Ping ping = new Ping();
                PingReply reply = ping.Send(host, 1000);
                return reply.Status == IPStatus.Success;
            }
            catch { return false; }
        }

        private void plcStatus_Click(object sender, EventArgs e)
        {

        }
    }
}