using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text.RegularExpressions;
using System.Xml.Linq;

namespace IoTNode.DeviceServices.Onvif
{
    public class IPCamera
    {
        public string DiscoveryXml { get; set; }
        public string GetCapabilitiesXml { get; set; }
        public string DeviceUrl { get; set; }
        public string Ip { get; set; }
        public string Id { get; set; }
        public string MediaUrl { get; set; }
        public string GetProfilesXml { get; set; }
        public string UserName { get; set; }
        public string Password { get; set; }
        public string PTZAddress { get; set; }
        public bool Ptz3DZoomSupport { get; set; }
        public List<Profile> Profiles { get; set; } = new List<Profile>();
        public string StreamUriXml { get; set; }
        public string SnapshotUriXml { get; set; }
        public string StreamUri { get; private set; }
        public string SnapshotUri { get; private set; }

        public void ParseDiscovery()
        {
            var doc = XDocument.Parse(this.DiscoveryXml);
            this.DeviceUrl = doc.Descendants().FirstOrDefault(o => o.Name.LocalName == "XAddrs").Value.Split(' ')[0];
            this.Id = doc.Descendants()
                .FirstOrDefault(o => o.Name.LocalName == "EndpointReference").Elements()
                .FirstOrDefault(o => o.Name.LocalName == "Address").Value.Replace("urn:uuid:", "").Replace("-", "");
            this.Ip = Regex.Match(this.DeviceUrl, "//([^/]*)/").Groups[1].Value;
        }

        public void ParseCapabilities()
        {
            var doc = XDocument.Parse(this.GetCapabilitiesXml);
            this.MediaUrl = doc.Descendants().FirstOrDefault(o => o.Name.LocalName == "Media").Elements().FirstOrDefault(o => o.Name.LocalName == "XAddr").Value;
            this.PTZAddress = doc.Descendants().FirstOrDefault(o => o.Name.LocalName == "PTZ")?.Elements().FirstOrDefault(o => o.Name.LocalName == "XAddr")?.Value;
            this.Ptz3DZoomSupport = string.IsNullOrWhiteSpace(this.PTZAddress) ? false : true;
        }

        public void ParseProfiles()
        {
            if (string.IsNullOrEmpty(this.GetProfilesXml))
            {
                return;
            }
            var doc = XDocument.Parse(this.GetProfilesXml);
            foreach (var item in doc.Descendants().Where(o => o.Name.LocalName == "Profiles"))
            {
                var profile = new Profile
                {
                    Token = item.Attribute("token").Value,
                    Name = item.Elements().FirstOrDefault(o => o.Name.LocalName == "Name").Value
                };
                var condition = false;
                var videoEncoderConfiguration = item.Elements().FirstOrDefault(o => o.Name.LocalName == "VideoEncoderConfiguration");
                XElement resolution = null;
                if (videoEncoderConfiguration == null)
                {
                    condition = true;
                    videoEncoderConfiguration = item.Elements().FirstOrDefault(o => o.Name.LocalName == "VideoSourceConfiguration");
                    resolution = videoEncoderConfiguration.Elements().FirstOrDefault(o => o.Name.LocalName == "Bounds");
                }
                else
                {
                    resolution = videoEncoderConfiguration.Elements().FirstOrDefault(o => o.Name.LocalName == "Resolution");
                }
                if (condition)
                {
                    profile.Width = Convert.ToInt32(resolution.Attribute("width").Value);
                    profile.Height = Convert.ToInt32(resolution.Attribute("height").Value);
                }
                else
                {
                    profile.Width = Convert.ToInt32(resolution.Elements().FirstOrDefault(o => o.Name.LocalName == "Width").Value);
                    profile.Height = Convert.ToInt32(resolution.Elements().FirstOrDefault(o => o.Name.LocalName == "Height").Value);
                }
                this.Profiles.Add(profile);
            }
        }

        public void ParseStreamUri()
        {
            this.StreamUri = WebUtility.HtmlDecode(this.RegexMatch(this.StreamUriXml, @"[^<>]*", @"<tt:Uri>", @"</tt:Uri>"));
        }

        public void ParseSnapshotUri()
        {
            this.SnapshotUri = WebUtility.HtmlDecode(this.RegexMatch(this.SnapshotUriXml, @"[^<>]*", @"<tt:Uri>", @"</tt:Uri>"));
        }

        private string RegexMatch(string input, string pattern, string prefix, string suffix)
        {
            return Regex.Match(input, $"(?<={prefix}){pattern}(?={suffix})").Value;
        }
    }
}