// Copyright (c) Microsoft Corporation
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Text;

using Microsoft.PowerToys.Run.Plugin.System.Properties;

namespace Microsoft.PowerToys.Run.Plugin.System.Components
{
    /// <summary>
    /// This class represents the information for a network connection/interface
    /// </summary>
    internal sealed class NetworkConnectionProperties
    {
        /// <summary>
        /// Gets the name of the adapter
        /// </summary>
        internal string Adapter { get; private set; }

        /// <summary>
        /// Gets the physical address (MAC) of the adapter
        /// </summary>
        internal string PhysicalAddress { get; private set; }

        /// <summary>
        /// Gets a value indicating the interface type
        /// </summary>
        internal NetworkInterfaceType Type { get; private set; }

        /// <summary>
        /// Gets the speed of the adapter as unformatted value (Static information form the adapter device)
        /// </summary>
        internal long Speed { get; private set; }

        /// <summary>
        /// Gets a value indicating the operational state of the adapter
        /// </summary>
        internal OperationalStatus State { get; private set; }

        /// <summary>
        /// Gets the name of the network connection
        /// </summary>
        internal string ConnectionName { get; private set; }

        /// <summary>
        /// Gets a string with the suffix of the connection
        /// </summary>
        internal string Suffix { get; private set; }

        /// <summary>
        /// Gets the IPv4 address
        /// </summary>
        internal string IPv4 { get; private set; }

        /// <summary>
        /// Gets the IPv4 subnet mask
        /// </summary>
        internal string IPv4Mask { get; private set; }

        /// <summary>
        /// Gets the primarily used IPv6 address
        /// </summary>
        internal string IPv6Primary { get; private set; }

        /// <summary>
        /// Gets the global IPv6 address
        /// </summary>
        internal string IPv6Global { get; private set; }

        /// <summary>
        /// Gets the temporary IPv6 address
        /// </summary>
        internal string IPv6Temporary { get; private set; }

        /// <summary>
        /// Gets the link local IPv6 address
        /// </summary>
        internal string IPv6LinkLocal { get; private set; }

        /// <summary>
        /// Gets the site local IPv6 address
        /// </summary>
        internal string IPv6SiteLocal { get; private set; }

        /// <summary>
        /// Gets the unique local IPv6 address
        /// </summary>
        internal string IPv6UniqueLocal { get; private set; }

        /// <summary>
        /// Gets the list of gateway IPs as string
        /// </summary>
        internal List<IPAddress> Gateways { get; private set; } = new List<IPAddress>();

        /// <summary>
        /// Gets the list of DHCP server IPs as string
        /// </summary>
        internal IPAddressCollection DhcpServers { get; private set; }

        /// <summary>
        /// Gets the list of DNS server IPs as string
        /// </summary>
        internal IPAddressCollection DnsServers { get; private set; }

        /// <summary>
        /// Gets the list of WINS server IPs as string
        /// </summary>
        internal IPAddressCollection WinsServers { get; private set; }

        private static readonly CompositeFormat MicrosoftPluginSysGbps = CompositeFormat.Parse(Properties.Resources.Microsoft_plugin_sys_Gbps);
        private static readonly CompositeFormat MicrosoftPluginSysMbps = CompositeFormat.Parse(Properties.Resources.Microsoft_plugin_sys_Mbps);

        /// <summary>
        /// Initializes a new instance of the <see cref="NetworkConnectionProperties"/> class.
        /// This private constructor is used when we crete the list of adapter (properties) by calling <see cref="NetworkConnectionProperties.GetList()"/>.
        /// </summary>
        /// <param name="networkInterface">Network interface of the connection</param>
        private NetworkConnectionProperties(NetworkInterface networkInterface)
        {
            // Setting adapter properties
            Adapter = networkInterface.Description;
            PhysicalAddress = networkInterface.GetPhysicalAddress().ToString();
            Type = networkInterface.NetworkInterfaceType;
            Speed = networkInterface.Speed;
            State = networkInterface.OperationalStatus;

            // Connection properties
            ConnectionName = networkInterface.Name;
            if (State == OperationalStatus.Up)
            {
                Suffix = networkInterface.GetIPProperties().DnsSuffix;
                SetIpProperties(networkInterface.GetIPProperties());
            }
        }

        /// <summary>
        /// Creates a list with all network adapters and their properties
        /// </summary>
        /// <returns>List containing all network adapters</returns>
        internal static List<NetworkConnectionProperties> GetList()
        {
            var interfaces = NetworkInterface.GetAllNetworkInterfaces()
                                             .Where(x => x.NetworkInterfaceType != NetworkInterfaceType.Loopback && x.GetPhysicalAddress() != null)
                                             .Select(i => new NetworkConnectionProperties(i))
                                             .OrderByDescending(i => i.IPv4) // list IPv4 first
                                             .ThenBy(i => i.IPv6Primary) // then IPv6
                                             .ToList();
            return interfaces;
        }

        /// <summary>
        /// Gets a formatted string with the adapter details
        /// </summary>
        /// <returns>String with the details</returns>
        internal string GetAdapterDetails()
        {
            return $"{Resources.Microsoft_plugin_sys_AdapterName}: {Adapter}" +
                $"\n{Resources.Microsoft_plugin_sys_PhysicalAddress}: {PhysicalAddress}" +
                $"\n{Resources.Microsoft_plugin_sys_Speed}: {GetFormattedSpeedValue(Speed)}" +
                $"\n{Resources.Microsoft_plugin_sys_Type}: {GetAdapterTypeAsString(Type)}" +
                $"\n{Resources.Microsoft_plugin_sys_State}: " + (State == OperationalStatus.Up ? Resources.Microsoft_plugin_sys_Connected : Resources.Microsoft_plugin_sys_Disconnected) +
                $"\n{Resources.Microsoft_plugin_sys_ConnectionName}: {ConnectionName}";
        }

        /// <summary>
        /// Returns a formatted string with the connection details
        /// </summary>
        /// <returns>String with the details</returns>
        internal string GetConnectionDetails()
        {
            return $"{Resources.Microsoft_plugin_sys_ConnectionName}: {ConnectionName}" +
                $"\n{Resources.Microsoft_plugin_sys_State}: " + (State == OperationalStatus.Up ? Resources.Microsoft_plugin_sys_Connected : Resources.Microsoft_plugin_sys_Disconnected) +
                $"\n{Resources.Microsoft_plugin_sys_Type}: {GetAdapterTypeAsString(Type)}" +
                $"\n{Resources.Microsoft_plugin_sys_Suffix}: {Suffix}" +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Ip4Address}: ", IPv4) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Ip4SubnetMask}: ", IPv4Mask) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Ip6Address}:\n\t", IPv6Global) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Ip6Temp}:\n\t", IPv6Temporary) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Ip6Link}:\n\t", IPv6LinkLocal) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Ip6Site}:\n\t", IPv6SiteLocal) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Ip6Unique}:\n\t", IPv6UniqueLocal) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Gateways}:\n\t", Gateways) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Dhcp}:\n\t", DhcpServers) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Dns}:\n\t", DnsServers) +
                CreateIpInfoForDetailsText($"{Resources.Microsoft_plugin_sys_Wins}:\n\t", WinsServers) +
                $"\n\n{Resources.Microsoft_plugin_sys_AdapterName}: {Adapter}" +
                $"\n{Resources.Microsoft_plugin_sys_PhysicalAddress}: {PhysicalAddress}" +
                $"\n{Resources.Microsoft_plugin_sys_Speed}: {GetFormattedSpeedValue(Speed)}";
        }

        /// <summary>
        /// Set the ip address properties of the <see cref="NetworkConnectionProperties"/> instance.
        /// </summary>
        /// <param name="properties">Element of the type <see cref="IPInterfaceProperties"/>.</param>
        private void SetIpProperties(IPInterfaceProperties properties)
        {
            DateTime t = DateTime.Now;

            UnicastIPAddressInformationCollection ipList = properties.UnicastAddresses;
            GatewayIPAddressInformationCollection gwList = properties.GatewayAddresses;
            DhcpServers = properties.DhcpServerAddresses;
            DnsServers = properties.DnsAddresses;
            WinsServers = properties.WinsServersAddresses;

            for (int i = 0; i < ipList.Count; i++)
            {
                IPAddress ip = ipList[i].Address;

                if (ip.AddressFamily == AddressFamily.InterNetwork)
                {
                    IPv4 = ip.ToString();
                    IPv4Mask = ipList[i].IPv4Mask.ToString();
                }
                else if (ip.AddressFamily == AddressFamily.InterNetworkV6)
                {
                    if (string.IsNullOrEmpty(IPv6Primary))
                    {
                        IPv6Primary = ip.ToString();
                    }

                    if (ip.IsIPv6LinkLocal)
                    {
                        IPv6LinkLocal = ip.ToString();
                    }
                    else if (ip.IsIPv6SiteLocal)
                    {
                        IPv6SiteLocal = ip.ToString();
                    }
                    else if (ip.IsIPv6UniqueLocal)
                    {
                        IPv6UniqueLocal = ip.ToString();
                    }
                    else if (ipList[i].SuffixOrigin == SuffixOrigin.Random)
                    {
                        IPv6Temporary = ip.ToString();
                    }
                    else
                    {
                        IPv6Global = ip.ToString();
                    }
                }
            }

            for (int i = 0; i < gwList.Count; i++)
            {
                Gateways.Add(gwList[i].Address);
            }

            Debug.Print($"time for getting ips: {DateTime.Now - t}");
        }

        /// <summary>
        /// Gets the interface type as string
        /// </summary>
        /// <param name="type">The type to convert</param>
        /// <returns>A string indicating the interface type</returns>
        private string GetAdapterTypeAsString(NetworkInterfaceType type)
        {
            switch (type)
            {
                case NetworkInterfaceType.Wman:
                case NetworkInterfaceType.Wwanpp:
                case NetworkInterfaceType.Wwanpp2:
                    return Resources.Microsoft_plugin_sys_MobileBroadband;
                case NetworkInterfaceType.Wireless80211:
                    return Resources.Microsoft_plugin_sys_WirelessLan;
                case NetworkInterfaceType.Loopback:
                    return Resources.Microsoft_plugin_sys_Loopback;
                case NetworkInterfaceType.Tunnel:
                    return Resources.Microsoft_plugin_sys_TunnelConnection;
                case NetworkInterfaceType.Unknown:
                    return Resources.Microsoft_plugin_sys_Unknown;
                default:
                    return Resources.Microsoft_plugin_sys_Cable;
            }
        }

        /// <summary>
        /// Gets the speed as formatted text value
        /// </summary>
        /// <param name="speed">The adapter speed as <see langword="long"/>.</param>
        /// <returns>A formatted string like `100 MB/s`</returns>
        private static string GetFormattedSpeedValue(long speed)
        {
            return (speed >= 1000000000) ? string.Format(CultureInfo.InvariantCulture, MicrosoftPluginSysGbps, speed / 1000000000) : string.Format(CultureInfo.InvariantCulture, MicrosoftPluginSysMbps, speed / 1000000);
        }

        /// <summary>
        /// Returns IP info or an empty string
        /// </summary>
        /// <param name="title">Descriptive header for the information.</param>
        /// <param name="property">IP value as <see cref="string"/> or <see cref="List{String}"/>.</param>
        /// <returns>Formatted string or an empty string.</returns>
        /// <exception cref="ArgumentException">If the parameter <paramref name="property"/> is not of the type <see cref="string"/> or <see cref="List{String}"/>.</exception>
        private static string CreateIpInfoForDetailsText(string title, dynamic property)
        {
            switch (property)
            {
                case string:
                    return $"\n{title}{property}";
                case List<string> listString:
                    return listString.Count == 0 ? string.Empty : $"\n{title}{string.Join("\n\t", property)}";
                case List<IPAddress> listIP:
                    return listIP.Count == 0 ? string.Empty : $"\n{title}{string.Join("\n\t", property)}";
                case IPAddressCollection collectionIP:
                    return collectionIP.Count == 0 ? string.Empty : $"\n{title}{string.Join("\n\t", property)}";
                case null:
                    return string.Empty;
                default:
                    throw new ArgumentException($"'{property}' is not of type 'string', 'List<string>', 'List<IPAddress>' or 'IPAddressCollection'.", nameof(property));
            }
        }
    }
}