using System;
using Luneraria.Core;
using UnityEngine;
using UnityEngine.UIElements;

namespace Luneraria.UI
{
    /// <summary>
    /// Start screen of Champions of Luneraria (port of the network part of lune_menu.gd):
    /// offline (local host with bot seats), host a direct connection, or join one. The menu is
    /// the start screen of the game; the HUD's "Menü" returns here. Peer 1 is the host; free
    /// seats stay bots. The host is authoritative.
    /// </summary>
    public sealed class LuneMainMenu : VisualElement
    {
        public event Action<MatchOptions> StartOffline;
        public event Action<int, string> HostRequested;
        public event Action<string, int, string> JoinRequested;
        public event Action QuitRequested;

        public string Bund = "wurzelbund";
        public string Lane = "mid";

        readonly TextField _name;
        readonly TextField _address;
        readonly TextField _port;
        readonly Label _status;
        LuneButton _laneTop;
        LuneButton _laneMid;
        LuneButton _laneBot;

        public LuneMainMenu()
        {
            style.position = Position.Absolute;
            style.left = 0f;
            style.top = 0f;
            style.right = 0f;
            style.bottom = 0f;
            style.justifyContent = Justify.Center;
            style.alignItems = Align.Center;
            style.backgroundColor = new Color(.02f, .03f, .05f, .92f);

            var panel = new LunePanel(LunePanels.Menu);
            panel.style.minWidth = 560f;
            panel.style.maxWidth = 640f;
            Add(panel);
            VisualElement column = LuneUi.Box(true, 14f, panel);
            column.style.alignItems = Align.Center;

            LuneUi.Label("CHAMPIONS", "TitleLabel", column).style.fontSize = 56f;
            LuneUi.Label("OF  LUNERARIA", "TitleLabel", column).style.fontSize = 40f;
            LuneUi.Label("DREI LANES  ·  3 GEGEN 3  ·  AUTOBATTLER", "EyebrowLabel", column);
            LuneUi.Wrap(LuneUi.Label("Team Blau (Südwest) mit zwei Bot-Verbündeten gegen drei Bots in Team Rot. Kein Rundenlimit: Es gewinnt, wer den gegnerische Ancient zerstört. Für sechs Menschen hosten oder beitreten; freie Plätze bleiben Bots. Der Host ist autoritativ.", "MutedLabel", column));

            LuneUi.Label("DEIN BUND", "SectionLabel", column);
            VisualElement bundRow = LuneUi.Box(false, 10f, column);
            new LuneButton("Glutpakt", LuneButtons.HudToggle, bundRow).Clicked += () => SetBund("glutpakt");
            new LuneButton("Wurzelbund", LuneButtons.HudToggle, bundRow).Clicked += () => SetBund("wurzelbund");

            LuneUi.Label("DEINE LANE", "SectionLabel", column);
            VisualElement laneRow = LuneUi.Box(false, 10f, column);
            _laneTop = new LuneButton("Top", LuneButtons.HudToggle, laneRow);
            _laneMid = new LuneButton("Mid", LuneButtons.HudToggle, laneRow);
            _laneBot = new LuneButton("Bottom", LuneButtons.HudToggle, laneRow);
            _laneTop.ToggleMode = true;
            _laneMid.ToggleMode = true;
            _laneBot.ToggleMode = true;
            _laneTop.Clicked += () => SetLane("top");
            _laneMid.Clicked += () => SetLane("mid");
            _laneBot.Clicked += () => SetLane("bot");
            SetLane("mid");

            LuneUi.Label("NETZWERK  ·  DIREKTVERBINDUNG", "SectionLabel", column);
            _name = Field(column, "Anzeigename", "Spieler");
            VisualElement netRow = LuneUi.Box(false, 10f, column);
            _address = Field(netRow, "Host-Adresse", "127.0.0.1");
            _address.style.flexGrow = 1f;
            _port = Field(netRow, "Port", LuneNet.DefaultPort.ToString());
            _port.style.width = 100f;

            VisualElement actions = LuneUi.Box(false, 12f, column);
            new LuneButton("ALLEIN SPIELEN", LuneButtons.Primary, actions).Clicked += StartAlone;
            new LuneButton("HOSTEN", LuneButtons.Secondary, actions).Clicked += StartHost;
            new LuneButton("BEITRETEN", LuneButtons.Secondary, actions).Clicked += StartJoin;
            new LuneButton("BEENDEN", LuneButtons.Secondary, actions).Clicked += () => QuitRequested?.Invoke();

            _status = LuneUi.Label("", "MutedLabel", column);
            _status.style.unityTextAlign = TextAnchor.MiddleCenter;
        }

        static TextField Field(VisualElement parent, string label, string value)
        {
            VisualElement box = LuneUi.Box(true, 4f, parent);
            box.style.flexGrow = 1f;
            LuneUi.Label(label, "EyebrowLabel", box);
            var field = new TextField { value = value };
            field.style.flexGrow = 1f;
            field.style.minHeight = 32f;
            field.style.fontSize = 16f;
            box.Add(field);
            return field;
        }

        void SetBund(string bund)
        {
            Bund = bund;
        }

        void SetLane(string lane)
        {
            Lane = lane;
            _laneTop.On = lane == "top";
            _laneMid.On = lane == "mid";
            _laneBot.On = lane == "bot";
        }

        /// <summary>Own seat on team Blau: slots 0–2 map to top, mid, bot.</summary>
        public MatchOptions OfflineOptions()
        {
            int seat = Array.IndexOf(LuneMap.Lanes, Lane);
            if (seat < 0)
                seat = 1;
            var options = new MatchOptions { Seed = Environment.TickCount & 0xffff, HumanSlot = seat };
            for (int slot = 0; slot < 6; slot++)
                options.Bunds.Add(slot == seat ? Bund : DataCatalog.Factions[(slot + options.Seed) % DataCatalog.Factions.Length]);
            return options;
        }

        void StartAlone()
        {
            StartOffline?.Invoke(OfflineOptions());
        }

        void StartHost()
        {
            int port = ParsePort();
            HostRequested?.Invoke(port, CleanName());
        }

        void StartJoin()
        {
            int port = ParsePort();
            JoinRequested?.Invoke(_address.value.Trim(), port, CleanName());
        }

        int ParsePort()
        {
            int port;
            return int.TryParse(_port.value.Trim(), out port) && port > 0 ? port : LuneNet.DefaultPort;
        }

        string CleanName()
        {
            string name = (_name.value ?? "").Trim();
            if (name.Length == 0)
                name = "Spieler";
            return name.Length > 24 ? name.Substring(0, 24) : name;
        }

        public void Notify(string message, bool error = false)
        {
            _status.text = message ?? "";
            _status.style.color = error ? LuneUiTheme.Hex("ff8a70") : LuneUiTheme.Muted;
        }

        public void Enter()
        {
            LuneUi.Show(this, true);
            Notify("");
        }

        public void Leave()
        {
            LuneUi.Show(this, false);
        }
    }
}