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

namespace MSCO
{
    /// <summary>Spieler im Admin-Menü.</summary>
    public class AdminPlayer
    {
        public int Id;
        public string Name;
        public string SteamId;
        public bool IsAdmin;
    }

    /// <summary>
    /// Fenster über dem Spiel: F7-Konsole (alle MSCO-Befehle), Chat (T) und Admin-Menü (/admin).
    /// Solange eins davon offen ist, sind Spielerbewegung und Kamera gesperrt (InputLock).
    /// </summary>
    public class Overlays
    {
        const int MaxConsoleLines = 300;
        const int MaxChatLines = 60;
        const float ChatFadeSeconds = 15f;
        const string ConsoleControl = "msco_console";
        const string ChatControl = "msco_chat";

        class ChatLine
        {
            public string Name, Text;
            public bool System;
            public float Time;
        }

        // Konsole
        public bool ConsoleOpen { get; private set; }
        readonly List<string> consoleLines = new List<string>();
        readonly List<string> history = new List<string>();
        int historyIndex = -1;
        string consoleInput = "";
        Vector2 consoleScroll;
        int consoleOpenedFrame = -1;
        bool consoleScrollToEnd;

        // Chat
        public bool ChatOpen { get; private set; }
        readonly List<ChatLine> chat = new List<ChatLine>();
        string chatInput = "";
        int chatOpenedFrame = -1;

        // Admin
        public bool AdminOpen { get; private set; }
        List<AdminPlayer> adminPlayers;
        List<string> bannedIds;
        int adminTab;
        string adminReason = "";
        int confirmBanId = -1;
        Vector2 adminScroll;

        public bool AnyOpen { get { return ConsoleOpen || ChatOpen || AdminOpen; } }

        // Stile
        bool stylesReady;
        GUIStyle panel, rowStyle, field, logText, caption, title, primary, secondary, danger, chatName, chatText, chatSystem, small;

        // ---------------------------------------------------------------- Öffnen/Schließen

        public void ToggleConsole()
        {
            ConsoleOpen = !ConsoleOpen;
            if (ConsoleOpen)
            {
                ChatOpen = false;
                consoleOpenedFrame = Time.frameCount;
                consoleScrollToEnd = true;
            }
        }

        public void OpenChat()
        {
            if (AnyOpen) return;
            ChatOpen = true;
            chatOpenedFrame = Time.frameCount;
            chatInput = "";
        }

        public void OpenAdmin(List<AdminPlayer> players)
        {
            AdminOpen = true;
            ConsoleOpen = false;
            ChatOpen = false;
            adminPlayers = players;
            confirmBanId = -1;
        }

        public void SetAdminPlayers(List<AdminPlayer> players) { adminPlayers = players; }
        public void SetBanned(List<string> ids) { bannedIds = ids; }
        public void SetBackups(List<string> names) { backupNames = names; }
        List<string> backupNames;
        string confirmWorld; // "reset" oder Name des Backups, das wiederhergestellt werden soll

        public void CloseAll()
        {
            ConsoleOpen = ChatOpen = AdminOpen = false;
        }

        // ---------------------------------------------------------------- Inhalte

        public void Log(string line)
        {
            foreach (string part in (line ?? "").Split('\n'))
            {
                consoleLines.Add(part);
                if (consoleLines.Count > MaxConsoleLines) consoleLines.RemoveAt(0);
            }
            consoleScrollToEnd = true;
        }

        public void AddChat(string name, string text, bool system = false)
        {
            chat.Add(new ChatLine { Name = name, Text = text, System = system, Time = Time.realtimeSinceStartup });
            if (chat.Count > MaxChatLines) chat.RemoveAt(0);
        }

        // ---------------------------------------------------------------- Zeichnen (OnGUI)

        public void Draw(MultiplayerManager mp, bool inGame)
        {
            EnsureStyles();
            if (inGame) DrawChat(mp);
            if (ConsoleOpen) DrawConsole();
            if (AdminOpen) DrawAdmin(mp);
        }

        void DrawConsole()
        {
            float width = Mathf.Min(Screen.width - 40, 960);
            var rect = new Rect((Screen.width - width) / 2f, 20, width, Mathf.Min(340, Screen.height * 0.5f));
            UiTheme.DrawShadow(rect);
            GUI.Box(rect, GUIContent.none, panel);

            GUI.Label(new Rect(rect.x + 16, rect.y + 10, 300, 20), "MSCO CONSOLE", caption);
            GUI.Label(new Rect(rect.xMax - 216, rect.y + 10, 200, 20), "type 'help'  -  F7 to close", small);

            // Tasten: Enter ausführen, Esc schließen, Hoch/Runter Verlauf
            Event e = Event.current;
            if (e.type == EventType.KeyDown && GUI.GetNameOfFocusedControl() == ConsoleControl)
            {
                if (e.keyCode == KeyCode.Return || e.keyCode == KeyCode.KeypadEnter)
                {
                    RunConsoleLine(consoleInput);
                    consoleInput = "";
                    e.Use();
                }
                else if (e.keyCode == KeyCode.Escape) { ConsoleOpen = false; e.Use(); return; }
                else if (e.keyCode == KeyCode.UpArrow && history.Count > 0)
                {
                    historyIndex = historyIndex < 0 ? history.Count - 1 : Mathf.Max(0, historyIndex - 1);
                    consoleInput = history[historyIndex];
                    e.Use();
                }
                else if (e.keyCode == KeyCode.DownArrow && historyIndex >= 0)
                {
                    historyIndex++;
                    consoleInput = historyIndex < history.Count ? history[historyIndex] : "";
                    if (historyIndex >= history.Count) historyIndex = -1;
                    e.Use();
                }
            }

            GUILayout.BeginArea(new Rect(rect.x + 14, rect.y + 34, rect.width - 28, rect.height - 84));
            if (consoleScrollToEnd && e.type == EventType.Repaint) { consoleScroll.y = float.MaxValue; consoleScrollToEnd = false; }
            consoleScroll = GUILayout.BeginScrollView(consoleScroll);
            foreach (string line in consoleLines) GUILayout.Label(line, logText);
            GUILayout.EndScrollView();
            GUILayout.EndArea();

            // Taste, mit der die Konsole geöffnet wurde, nicht als Zeichen übernehmen
            if (Time.frameCount == consoleOpenedFrame && e.type == EventType.KeyDown) e.Use();
            GUI.SetNextControlName(ConsoleControl);
            consoleInput = GUI.TextField(new Rect(rect.x + 14, rect.yMax - 46, rect.width - 28, 34), consoleInput, 200, field);
            GUI.FocusControl(ConsoleControl);
        }

        void RunConsoleLine(string line)
        {
            line = (line ?? "").Trim();
            if (line.Length == 0) return;
            history.Add(line);
            if (history.Count > 50) history.RemoveAt(0);
            historyIndex = -1;
            Log("> " + line);

            if (line == "clear") { consoleLines.Clear(); return; }
            string[] args = line.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
            if (args.Length > 0 && args[0] == "mp") // "mp connect ..." geht auch
            {
                var rest = new string[args.Length - 1];
                Array.Copy(args, 1, rest, 0, rest.Length);
                args = rest;
            }
            Commands.Execute(args, Log);
        }

        void DrawChat(MultiplayerManager mp)
        {
            float now = Time.realtimeSinceStartup;
            float width = Mathf.Min(460, Screen.width - 40);
            float lineHeight = 20;
            int maxLines = ChatOpen ? 12 : 6;

            // Sichtbare Zeilen: offen = die letzten, geschlossen = nur neue (blenden aus)
            var visible = new List<ChatLine>();
            for (int i = chat.Count - 1; i >= 0 && visible.Count < maxLines; i--)
                if (ChatOpen || now - chat[i].Time < ChatFadeSeconds) visible.Insert(0, chat[i]);

            float bottom = Screen.height * 0.62f;
            float height = visible.Count * lineHeight + (ChatOpen ? 52 : 12);
            var rect = new Rect(20, bottom - height, width, height);
            if (ChatOpen || visible.Count > 0) GUI.Box(rect, GUIContent.none, ChatOpen ? panel : rowStyle);

            Color old = GUI.color;
            float y = rect.y + 6;
            foreach (ChatLine line in visible)
            {
                float age = now - line.Time;
                float alpha = ChatOpen ? 1f : Mathf.Clamp01((ChatFadeSeconds - age) / 3f);
                GUI.color = new Color(1f, 1f, 1f, alpha);
                if (line.System)
                {
                    GUI.Label(new Rect(rect.x + 12, y, width - 24, lineHeight), line.Text, chatSystem);
                }
                else
                {
                    Vector2 size = chatName.CalcSize(new GUIContent(line.Name + ":"));
                    GUI.Label(new Rect(rect.x + 12, y, size.x, lineHeight), line.Name + ":", chatName);
                    GUI.Label(new Rect(rect.x + 16 + size.x, y, width - 28 - size.x, lineHeight), line.Text, chatText);
                }
                y += lineHeight;
            }
            GUI.color = old;

            if (!ChatOpen) return;

            Event e = Event.current;
            if (e.type == EventType.KeyDown && GUI.GetNameOfFocusedControl() == ChatControl)
            {
                if (e.keyCode == KeyCode.Return || e.keyCode == KeyCode.KeypadEnter)
                {
                    string text = chatInput.Trim();
                    if (text.Length > 0)
                    {
                        if (text.StartsWith("/")) RunConsoleLine(text.Substring(1)); // z.B. /admin
                        else mp.SendChat(text);
                    }
                    chatInput = "";
                    ChatOpen = false;
                    e.Use();
                    return;
                }
                if (e.keyCode == KeyCode.Escape) { ChatOpen = false; e.Use(); return; }
            }

            // Taste, mit der der Chat geöffnet wurde (T), nicht als Zeichen übernehmen
            if (Time.frameCount == chatOpenedFrame && e.type == EventType.KeyDown) e.Use();
            GUI.SetNextControlName(ChatControl);
            chatInput = GUI.TextField(new Rect(rect.x + 10, rect.yMax - 40, width - 20, 30), chatInput, 150, field);
            GUI.FocusControl(ChatControl);
        }

        void DrawAdmin(MultiplayerManager mp)
        {
            float width = Mathf.Min(720, Screen.width - 40), height = Mathf.Min(580, Screen.height - 40);
            var rect = new Rect((Screen.width - width) / 2f, (Screen.height - height) / 2f, width, height);
            UiTheme.DrawShadow(rect);
            GUI.Box(rect, GUIContent.none, panel);

            if (Event.current.type == EventType.KeyDown && Event.current.keyCode == KeyCode.Escape)
            {
                AdminOpen = false;
                Event.current.Use();
                return;
            }

            GUILayout.BeginArea(new Rect(rect.x + 20, rect.y + 16, rect.width - 40, rect.height - 32));
            GUILayout.BeginHorizontal();
            GUILayout.Label("Admin", title, GUILayout.ExpandWidth(true)); // nicht von den Buttons zusammendrücken lassen
            if (GUILayout.Button("REFRESH", secondary, GUILayout.Height(30), GUILayout.Width(100))) mp.RequestAdminList();
            GUILayout.Space(8);
            if (GUILayout.Button("CLOSE", secondary, GUILayout.Height(30), GUILayout.Width(90))) AdminOpen = false;
            GUILayout.EndHorizontal();
            GUILayout.Space(6);

            // Reiter
            GUILayout.BeginHorizontal();
            string[] tabs = { "PLAYERS", "TELEPORT", "ITEMS", "BANS" + (bannedIds != null && bannedIds.Count > 0 ? " (" + bannedIds.Count + ")" : ""), "WORLD" };
            for (int i = 0; i < tabs.Length; i++)
            {
                if (GUILayout.Button(tabs[i], adminTab == i ? primary : secondary, GUILayout.Height(30), GUILayout.Width(120))) adminTab = i;
                GUILayout.Space(6);
            }
            GUILayout.EndHorizontal();
            GUILayout.Space(10);

            if (adminTab == 1) DrawAdminTeleport(mp);
            else if (adminTab == 2) DrawAdminItems(mp);
            else if (adminTab == 3) DrawAdminBans(mp);
            else if (adminTab == 4) DrawAdminWorld(mp);
            else DrawAdminPlayers(mp);
            GUILayout.EndArea();
        }

        Vector2 teleportScroll;

        void DrawAdminTeleport(MultiplayerManager mp)
        {
            if (!mp.CanCheat)
            {
                GUILayout.Label("Teleporting only works in the game.", small);
                return;
            }
            GUILayout.Label("Teleport yourself to a place. Players: use GOTO / BRING on the PLAYERS tab.", small);
            GUILayout.Space(8);
            teleportScroll = GUILayout.BeginScrollView(teleportScroll);
            const int columns = 3;
            for (int i = 0; i < Cheats.Places.Length; i += columns)
            {
                GUILayout.BeginHorizontal();
                for (int c = 0; c < columns; c++)
                {
                    if (i + c < Cheats.Places.Length)
                    {
                        string[] place = Cheats.Places[i + c];
                        if (GUILayout.Button(place[0].ToUpperInvariant(), secondary, GUILayout.Height(38)))
                            mp.TeleportToPlace(place[0], place[1]);
                    }
                    else GUILayout.Label("", GUILayout.Height(38));
                    if (c < columns - 1) GUILayout.Space(6);
                }
                GUILayout.EndHorizontal();
                GUILayout.Space(6);
            }
            GUILayout.EndScrollView();
        }

        void DrawAdminPlayers(MultiplayerManager mp)
        {
            // Cheats für den eigenen Spieler (nur im Spiel)
            if (mp.CanCheat)
            {
                GUILayout.BeginHorizontal();
                if (GUILayout.Button("+1.000 MK", primary, GUILayout.Height(30))) mp.CheatMoney(1000f);
                GUILayout.Space(6);
                if (GUILayout.Button("+10.000 MK", primary, GUILayout.Height(30))) mp.CheatMoney(10000f);
                GUILayout.Space(6);
                if (GUILayout.Button("REFILL NEEDS", primary, GUILayout.Height(30))) mp.CheatNeeds();
                GUILayout.Space(6);
                if (GUILayout.Button("SATSUMA TO ME", primary, GUILayout.Height(30))) mp.BringCar();
                GUILayout.EndHorizontal();
                GUILayout.Label("Cheats are announced in the chat. GOTO teleports you to a player, BRING teleports a player to you.", small);
                GUILayout.Space(8);
            }

            GUILayout.Label("REASON FOR KICK / BAN (optional)", caption);
            adminReason = GUILayout.TextField(adminReason, 100, field, GUILayout.Height(32));
            GUILayout.Space(10);

            adminScroll = GUILayout.BeginScrollView(adminScroll);
            if (adminPlayers == null) GUILayout.Label("Loading players...", small);
            else if (adminPlayers.Count == 0) GUILayout.Label("No players.", small);
            else
            {
                foreach (AdminPlayer p in adminPlayers)
                {
                    GUILayout.BeginHorizontal(rowStyle, GUILayout.Height(44));
                    GUILayout.BeginVertical();
                    bool you = p.Id == mp.LocalId;
                    GUILayout.Label(p.Name + (you ? "  (you)" : "") + (p.IsAdmin ? "  (admin)" : ""), chatName);
                    GUILayout.Label(string.IsNullOrEmpty(p.SteamId) ? "id " + p.Id : p.SteamId.StartsWith("name:") ? "no Steam" : "SteamID " + p.SteamId, small);
                    GUILayout.EndVertical();
                    GUILayout.FlexibleSpace();

                    bool self = p.Id == mp.LocalId;
                    if (mp.CanCheat)
                    {
                        GUI.enabled = !self;
                        if (GUILayout.Button("GOTO", secondary, GUILayout.Height(30), GUILayout.Width(70))) mp.GotoPlayer(p.Id);
                        GUILayout.Space(6);
                        if (GUILayout.Button("BRING", secondary, GUILayout.Height(30), GUILayout.Width(70))) mp.BringPlayer(p.Id);
                        GUILayout.Space(12);
                    }
                    if (mp.IsDedicated)
                    {
                        // Admin geben/nehmen (braucht Steam; der Server meldet, wenn es nicht geht)
                        GUI.enabled = !self;
                        if (GUILayout.Button(p.IsAdmin ? "REMOVE ADMIN" : "MAKE ADMIN", secondary, GUILayout.Height(30), GUILayout.Width(120)))
                            mp.SetAdmin(p.Id, !p.IsAdmin);
                        GUILayout.Space(12);
                    }
                    GUI.enabled = !self && !p.IsAdmin;
                    if (GUILayout.Button("KICK", secondary, GUILayout.Height(30), GUILayout.Width(70)))
                        mp.AdminAction(false, p.Id, adminReason);
                    GUILayout.Space(6);
                    bool confirming = confirmBanId == p.Id;
                    if (GUILayout.Button(confirming ? "SURE?" : "BAN", danger, GUILayout.Height(30), GUILayout.Width(70)))
                    {
                        if (confirming) { mp.AdminAction(true, p.Id, adminReason); confirmBanId = -1; }
                        else confirmBanId = p.Id;
                    }
                    GUI.enabled = true;
                    GUILayout.EndHorizontal();
                    GUILayout.Space(4);
                }
            }
            GUILayout.EndScrollView();
        }

        void DrawAdminItems(MultiplayerManager mp)
        {
            if (!mp.CanCheat)
            {
                GUILayout.Label("Items can only be spawned in the game.", small);
                return;
            }
            GUILayout.Label("Click an item to spawn it in front of you. Everyone sees it, and it is saved on the server.", small);
            GUILayout.Space(8);
            adminScroll = GUILayout.BeginScrollView(adminScroll);
            const int perRow = 4;
            for (int i = 0; i < ItemSpawner.Items.Length; i += perRow)
            {
                GUILayout.BeginHorizontal();
                for (int k = i; k < Mathf.Min(i + perRow, ItemSpawner.Items.Length); k++)
                {
                    string item = ItemSpawner.Items[k];
                    if (GUILayout.Button(item.ToUpper(), secondary, GUILayout.Height(34), GUILayout.Width(155))) mp.SpawnItem(item);
                    GUILayout.Space(6);
                }
                GUILayout.EndHorizontal();
                GUILayout.Space(6);
            }
            GUILayout.EndScrollView();
        }

        /// <summary>Welt zurücksetzen, Backups anlegen und wiederherstellen (dedizierter Server).</summary>
        void DrawAdminWorld(MultiplayerManager mp)
        {
            if (!mp.IsDedicated)
            {
                GUILayout.Label("World reset and save backups are only available on a dedicated server.", small);
                return;
            }
            GUILayout.Label("Everyone reconnects after a reset or restore. The current state is backed up first.", small);
            GUILayout.Space(8);

            GUILayout.BeginHorizontal();
            if (confirmWorld == "reset")
            {
                if (GUILayout.Button("REALLY RESET?", danger, GUILayout.Height(32), GUILayout.Width(170))) { mp.WorldAction(5, null); confirmWorld = null; }
                GUILayout.Space(6);
                if (GUILayout.Button("CANCEL", secondary, GUILayout.Height(32), GUILayout.Width(100))) confirmWorld = null;
            }
            else if (GUILayout.Button("RESET WORLD", danger, GUILayout.Height(32), GUILayout.Width(170))) confirmWorld = "reset";
            GUILayout.Space(10);
            if (GUILayout.Button("BACKUP NOW", primary, GUILayout.Height(32), GUILayout.Width(150))) mp.WorldAction(6, null);
            GUILayout.Space(6);
            if (confirmWorld == "point")
            {
                if (GUILayout.Button("REALLY?", danger, GUILayout.Height(32), GUILayout.Width(100))) { mp.WorldAction(8, null); confirmWorld = null; }
                GUILayout.Space(4);
                if (GUILayout.Button("CANCEL", secondary, GUILayout.Height(32), GUILayout.Width(90))) confirmWorld = null;
            }
            else if (GUILayout.Button("SET RESET POINT", secondary, GUILayout.Height(32), GUILayout.Width(170))) confirmWorld = "point";
            GUILayout.FlexibleSpace();
            GUILayout.EndHorizontal();
            GUILayout.Label("Reset: the whole world goes back to the save game as it was uploaded to the server (the reset point). " +
                            "SET RESET POINT makes the current save the new reset point.", small);
            GUILayout.Space(10);

            GUILayout.Label("SAVE BACKUPS (NEWEST FIRST)", small);
            adminScroll = GUILayout.BeginScrollView(adminScroll);
            if (backupNames == null) GUILayout.Label("Loading...", small);
            else if (backupNames.Count == 0) GUILayout.Label("No backups yet. They are created automatically when the server takes over a save game, or with BACKUP NOW.", small);
            else
            {
                foreach (string name in backupNames)
                {
                    GUILayout.BeginHorizontal(rowStyle, GUILayout.Height(40));
                    GUILayout.Label(PrettyBackup(name), chatName);
                    GUILayout.FlexibleSpace();
                    if (confirmWorld == name)
                    {
                        if (GUILayout.Button("REALLY?", danger, GUILayout.Height(28), GUILayout.Width(100))) { mp.WorldAction(7, name); confirmWorld = null; }
                        GUILayout.Space(4);
                        if (GUILayout.Button("CANCEL", secondary, GUILayout.Height(28), GUILayout.Width(90))) confirmWorld = null;
                    }
                    else if (GUILayout.Button("RESTORE", primary, GUILayout.Height(28), GUILayout.Width(100))) confirmWorld = name;
                    GUILayout.EndHorizontal();
                    GUILayout.Space(4);
                }
            }
            GUILayout.EndScrollView();
        }

        /// <summary>"20260927-104626" -> "27.09.2026  10:46:26".</summary>
        static string PrettyBackup(string name)
        {
            if (name == null || name.Length != 15 || name[8] != '-') return name;
            return name.Substring(6, 2) + "." + name.Substring(4, 2) + "." + name.Substring(0, 4) + "   " +
                   name.Substring(9, 2) + ":" + name.Substring(11, 2) + ":" + name.Substring(13, 2);
        }

        void DrawAdminBans(MultiplayerManager mp)
        {
            GUILayout.Label(mp.IsDedicated ? "Banned players cannot join this server. UNBAN lets them in again."
                                           : "Players banned from your game in this session.", small);
            GUILayout.Space(8);
            adminScroll = GUILayout.BeginScrollView(adminScroll);
            if (bannedIds == null) GUILayout.Label("Loading...", small);
            else if (bannedIds.Count == 0) GUILayout.Label("Nobody is banned.", small);
            else
            {
                foreach (string id in bannedIds)
                {
                    GUILayout.BeginHorizontal(rowStyle, GUILayout.Height(40));
                    GUILayout.Label(id.StartsWith("name:") ? id.Substring(5) + "  (no Steam)" : "SteamID " + id, chatName);
                    GUILayout.FlexibleSpace();
                    if (GUILayout.Button("UNBAN", primary, GUILayout.Height(28), GUILayout.Width(90))) mp.Unban(id);
                    GUILayout.EndHorizontal();
                    GUILayout.Space(4);
                }
            }
            GUILayout.EndScrollView();
        }

        // ---------------------------------------------------------------- Stile

        void EnsureStyles()
        {
            if (stylesReady && panel.normal.background != null) return;
            panel = UiTheme.Card(UiTheme.Background, 10);
            rowStyle = UiTheme.Panel9(new Color(0.06f, 0.06f, 0.07f, 0.72f));
            rowStyle.padding = new RectOffset(12, 12, 6, 6);
            field = UiTheme.Field(14);
            logText = UiTheme.Label(12, UiTheme.Text);
            logText.wordWrap = true;
            logText.richText = true; // Warnungen/Fehler farbig markiert (MscoLog)
            logText.margin = new RectOffset(0, 0, 0, 0);
            caption = UiTheme.Label(11, UiTheme.Muted, FontStyle.Bold);
            title = UiTheme.Label(22, UiTheme.Text, FontStyle.Bold);
            title.wordWrap = false;
            small = UiTheme.Label(11, UiTheme.Muted);
            primary = UiTheme.PrimaryButton();
            secondary = UiTheme.Button(UiTheme.Secondary, UiTheme.SecondaryHover, UiTheme.Text, 12);
            danger = UiTheme.Button(UiTheme.Danger, UiTheme.DangerHover, Color.white, 12);
            chatName = UiTheme.Label(13, UiTheme.AccentHover, FontStyle.Bold, TextAnchor.MiddleLeft);
            chatText = UiTheme.Label(13, UiTheme.Text, FontStyle.Normal, TextAnchor.MiddleLeft);
            chatSystem = UiTheme.Label(12, UiTheme.Muted, FontStyle.Italic, TextAnchor.MiddleLeft);
            stylesReady = true;
        }
    }
}