using System;
using System.Collections.Generic;
using System.Threading;
using UnityEngine;

namespace MSCO
{
    /// <summary>Eine Ankündigung der MSCO-Admins (Keymaster → Wartung &amp; News, Ziel "Spiel").</summary>
    public class Announcement
    {
        public string Id, Title, Text, Level; // Level: info, warning, critical
    }

    /// <summary>
    /// Status vom Keymaster (/api/status?for=game): Wartungsmodus, Ankündigungen und die Mindest-Sicherheitsstufe der
    /// Server. Wird im Hintergrund geladen (WinHTTP, blockiert das Spiel nicht) und alle paar Minuten aufgefrischt.
    /// Ohne Verbindung gilt das Eingebaute (MSCO.MinServerSecurity), Ankündigungen fehlen dann einfach.
    /// </summary>
    public static class SiteStatus
    {
        const float RefreshSeconds = 300f;

        static readonly object gate = new object();
        static List<Announcement> announcements = new List<Announcement>();
        static bool maintenance;
        static string maintenanceMessage = "";
        static int minServerLevel; // vom Keymaster (0 = unbekannt)
        static float nextFetch;
        static bool fetching;

        /// <summary>Aktuelle Ankündigungen (wichtigste zuerst).</summary>
        public static List<Announcement> Announcements { get { lock (gate) return new List<Announcement>(announcements); } }
        public static bool Maintenance { get { lock (gate) return maintenance; } }
        public static string MaintenanceMessage { get { lock (gate) return maintenanceMessage; } }

        /// <summary>
        /// Sicherheitsstufe, die Server und P2P-Hosts mindestens haben müssen: das Eingebaute oder - wenn höher - was die
        /// MSCO-Admins im Keymaster eingestellt haben.
        /// </summary>
        public static int RequiredServerSecurity { get { lock (gate) return Math.Max(MSCO.MinServerSecurity, minServerLevel); } }

        /// <summary>Neue Ankündigung seit dem letzten Abruf (für einen Hinweis im Spiel).</summary>
        public static event Action<Announcement> NewAnnouncement;

        static readonly HashSet<string> seen = new HashSet<string>();
        static readonly List<Announcement> fresh = new List<Announcement>(); // neu, noch nicht gemeldet (Hauptthread)
        static bool firstLoad = true;

        /// <summary>Jedes Frame aufrufen (MultiplayerManager): lädt beim Start und dann alle 5 Minuten neu.</summary>
        public static void Tick()
        {
            Action<Announcement> handler = NewAnnouncement;
            List<Announcement> report = null;
            lock (gate)
                if (fresh.Count > 0) { report = new List<Announcement>(fresh); fresh.Clear(); }
            if (report != null && handler != null)
                foreach (Announcement a in report)
                    try { handler(a); } catch { }
            if (fetching || Time.realtimeSinceStartup < nextFetch) return;
            Refresh();
        }

        /// <summary>Sofort neu laden (z.B. beim Öffnen des Server-Browsers).</summary>
        public static void Refresh()
        {
            if (fetching) return;
            fetching = true;
            nextFetch = Time.realtimeSinceStartup + RefreshSeconds;
            var thread = new Thread(() =>
            {
                try
                {
                    string error;
                    string text = WinHttp.Get(ServerBrowser.MasterUrl + "/api/status?for=game", 8000, out error);
                    if (text != null) Apply(text);
                }
                catch { }
                finally { fetching = false; }
            });
            thread.IsBackground = true;
            thread.Start();
        }

        static void Apply(string text)
        {
            var root = MiniJson.Parse(text) as Dictionary<string, object>;
            if (root == null) return;
            object v;
            var m = root.TryGetValue("maintenance", out v) ? v as Dictionary<string, object> : null;
            var sec = root.TryGetValue("security", out v) ? v as Dictionary<string, object> : null;
            var list = new List<Announcement>();
            var items = root.TryGetValue("announcements", out v) ? v as List<object> : null;
            if (items != null)
                foreach (object item in items)
                {
                    var a = item as Dictionary<string, object>;
                    if (a == null) continue;
                    list.Add(new Announcement
                    {
                        Id = MiniJson.Str(a, "id", ""),
                        Title = Clip(MiniJson.Str(a, "title", ""), 120),
                        Text = Clip(MiniJson.Str(a, "text", ""), 600),
                        Level = MiniJson.Str(a, "level", "info"),
                    });
                    if (list.Count >= 5) break;
                }
            lock (gate)
            {
                announcements = list;
                maintenance = m != null && MiniJson.Bool(m, "active");
                maintenanceMessage = m != null ? Clip(MiniJson.Str(m, "message", ""), 500) : "";
                if (sec != null) minServerLevel = Math.Max(0, Math.Min(1000, MiniJson.Int(sec, "minServerLevel")));
                foreach (Announcement a in list)
                    if (seen.Add(a.Id) && !firstLoad) fresh.Add(a);
                firstLoad = false;
            }
        }

        /// <summary>Kein Steuerzeichen/Rich-Text aus dem Netz in die Oberfläche (Unity-GUI wertet &lt;color&gt; usw. aus).</summary>
        static string Clip(string s, int max)
        {
            if (string.IsNullOrEmpty(s)) return "";
            var sb = new System.Text.StringBuilder(Math.Min(s.Length, max));
            foreach (char c in s)
            {
                if (sb.Length >= max) break;
                if (c == '<') sb.Append('‹');
                else if (c == '>') sb.Append('›');
                else if (c == '\n' || !char.IsControl(c)) sb.Append(c);
            }
            return sb.ToString();
        }
    }
}