using System.ComponentModel;
using System.Diagnostics;
using System.Net;
using System.Net.NetworkInformation;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Windows.Forms;
using Tmds.MDns;
using static robospot_camera_finder.MainForm;

namespace robospot_camera_finder
{
    public partial class MainForm : Form
    {
        private readonly ServiceBrowser browser = new();

        private BindingList<Camera> all_cameras = new();

        public static string cam_username = "admin";
        public static string cam_password = "RoboSpot10";

        private static string browse_scope = "_rtsp._tcp";

        bool is_browsing = false;

        public class Camera
        {
            public Camera(string name, string ip, string location, string serial)
            {
                camera_name = name;
                camera_ip = ip;
                camera_location = location;
                camera_serial = serial;
            }

            public Camera() { }

            public string camera_name { get; set; }

            public string camera_ip { get; set; }

            public string camera_location { get; set; }

            public string camera_serial { get; set; }
        }

        public MainForm()
        {
            InitializeComponent();

            bool got_proper_ip = false;
            foreach (var net_interface in NetworkInterface.GetAllNetworkInterfaces())
            {
                IPInterfaceProperties prop = net_interface.GetIPProperties();
                foreach (var ip in prop.UnicastAddresses)
                {
                    if (ip.Address.ToString().StartsWith("10."))
                    {
                        if (ip.IPv4Mask.ToString() == "255.0.0.0")
                        {
                            got_proper_ip = true;
                        }
                    }
                }
            }
            if (!got_proper_ip)
            {
                DialogResult open_netsettings = MessageBox.Show("No Ethernet interface on the 10.0.0.0/8 subnet found. Cameras might not be detected. Do you want to open network settings ?", "Wrong IP configuration", MessageBoxButtons.YesNo, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button1);
                if (open_netsettings == DialogResult.Yes)
                {
                    ProcessStartInfo startInfo = new ProcessStartInfo("NCPA.cpl");
                    startInfo.UseShellExecute = true;

                    Process.Start(startInfo);
                }
            }

            lbMain.DataSource = all_cameras;
            lbMain.DisplayMember = "camera_name";
            lbMain.ValueMember = "camera_ip";

            browser.ServiceAdded += (sender, args) =>
            {
                ServiceAdded(sender, args);
            };

            browser.ServiceChanged += (sender, args) =>
            {
                ServiceAdded(sender, args);
            };

            browser.ServiceRemoved += (sender, args) =>
            {
                if (browser.IsBrowsing)
                {
                    ServiceRemoved(sender, args);
                }
            };

            browse(true);
        }

        private void browse(bool browse_needed)
        {
            if (browse_needed)
            {
                if (!browser.IsBrowsing)
                {
                    browser.StartBrowse(browse_scope);
                    is_browsing = true;
                    toolStripStatusDisco.Text = "Discovery : Started";
                }
            }
            else
            {
                if (browser.IsBrowsing)
                {
                    browser.StopBrowse();
                    is_browsing = false;
                    toolStripStatusDisco.Text = "Discovery : Stopped";
                }
            }

            startToolStripMenuItem.Enabled = !browser.IsBrowsing;
            stopToolStripMenuItem.Enabled = browser.IsBrowsing;
        }

        private void ServiceAdded(object sender, ServiceAnnouncementEventArgs args)
        {
            foreach (var cam_addr in args.Announcement.Addresses)
            {
                if (cam_addr.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                {
                    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://" + cam_addr + "/stw-cgi/system.cgi?msubmenu=deviceinfo&action=view");
                    request.Credentials = new NetworkCredential(MainForm.cam_username, MainForm.cam_password);
                    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                    string text;
                    using (var sr = new StreamReader(response.GetResponseStream())) { text = sr.ReadToEnd(); }
                    string[] resp_lines = text.Split('\n');
                    string location_line = Array.Find(resp_lines, line => line.Trim().StartsWith("DeviceLocation="));
                    string serial_line = Array.Find(resp_lines, line => line.Trim().StartsWith("SerialNumber="));
                    string location = "";
                    string serial = "";
                    if (location_line != null)
                    {
                        location = location_line.Substring("DeviceLocation=".Length).Trim();
                    }
                    if (serial_line != null)
                    {
                        serial = serial_line.Substring("SerialNumber=".Length).Trim();
                    }

                    Camera new_camera = new Camera("Camera " + cam_addr + " - " + location + " - " + serial, cam_addr.ToString(), location, serial);

                    add_camera(new_camera);
                }
            }
        }

        private void add_camera(Camera new_camera)
        {
            if (all_cameras.Count == 0)
            {
                all_cameras.Add(new_camera);
            }
            else
            {
                Camera find_cam = all_cameras.FirstOrDefault(cam => cam.camera_serial == new_camera.camera_serial);

                if (find_cam != null)
                {
                    int i = all_cameras.IndexOf(find_cam);
                    all_cameras[i] = new_camera;
                }
                else
                {
                    all_cameras.Add(new_camera);
                }
            }
        }

        private void ServiceRemoved(object sender, ServiceAnnouncementEventArgs args)
        {
            foreach (var cam_ip in args.Announcement.Addresses)
            {
                if (cam_ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                {
                    foreach (var camera in all_cameras)
                    {
                        if (cam_ip.ToString() == camera.camera_ip)
                        {
                            all_cameras.Remove(camera);
                            return;
                        }
                    }
                }
            }
        }

        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            browser.StopBrowse();
        }

        private void lbMain_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (lbMain.SelectedItem != null)
            {
                toolStripStatusLabel.Text = "Loading camera...";
                Camera camera = all_cameras.FirstOrDefault<Camera>(cam => cam.camera_ip.ToString() == lbMain.SelectedValue.ToString());
                Form viewer = new StreamViewer(lbMain.GetItemText(lbMain.SelectedItem), lbMain.SelectedValue.ToString(), camera, this);
                viewer.Show();
                toolStripStatusLabel.Text = "";
            }
        }

        private void startToolStripMenuItem_Click(object sender, EventArgs e)
        {
            browse(true);
        }

        private void stopToolStripMenuItem_Click(object sender, EventArgs e)
        {
            browse(false);
        }

        private void forceReloadToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DialogResult result = MessageBox.Show("Are you sure you want to clear discovered cameras and restart the discovery process ?", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
            if (result == DialogResult.Yes)
            {
                browse(false);
                all_cameras.Clear();
                browse(true);
            }
        }

        private void loadToolStripMenuItem_Click(object sender, EventArgs e)
        {
            string json = "";
            OpenFileDialog openFile = new OpenFileDialog();
            openFile.Filter = "json file (*.json)|*.json";
            openFile.RestoreDirectory = true;

            if (openFile.ShowDialog() == DialogResult.OK)
            {
                json = File.ReadAllText(openFile.FileName);

                List<Camera> cameras_in_file = JsonSerializer.Deserialize<List<Camera>>(json);

                foreach (Camera new_camera in cameras_in_file)
                {
                    add_camera(new_camera);
                }
            }
        }

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            string json = JsonSerializer.Serialize<BindingList<Camera>>(all_cameras, new JsonSerializerOptions
            {
                WriteIndented = true
            });
            SaveFileDialog saveFile = new SaveFileDialog();
            saveFile.Filter = "json file (*.json)|*.json";
            saveFile.RestoreDirectory = true;

            if (saveFile.ShowDialog() == DialogResult.OK)
            {
                File.WriteAllText(saveFile.FileName, json);
            }
        }

        private void manualAddToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Manual_IP_Form manualForm = new Manual_IP_Form();

            if (manualForm.ShowDialog(this) == DialogResult.OK)
            {
                string ipAddress = manualForm.ipAddress;

                Camera camera_to_add = new Camera("Camera " + ipAddress, ipAddress, "", "");
                add_camera(camera_to_add);
            }
        }
    }
}