using System;
using System.Collections.Generic;
using System.Linq;
using Luneraria.Core;
using UnityEngine;
using UnityEngine.UIElements;

namespace Luneraria.UI
{
    /// <summary>
    /// The hero in the bottom bar (Godot LuneHeroCard): portrait, name, level, experience
    /// progress, HP, role, the three item slots and the talent state. A click opens the hero window
    /// (details, items, talents) or, without a hero, the recruiting window. No MOBA action bar:
    /// heroes act alone. H1: the command slot shows the ultimate of a hero that has one (its
    /// planned trigger rule, in combat whether it fired) and opens the hero window on it.
    /// </summary>
    public sealed class LuneHeroCard : LuneButton
    {
        public string HeroId = "";
        public event Action CommandRequested;
        readonly LunePortraitElement _portrait;
        readonly Label _name;
        readonly Label _level;
        readonly LuneGlyphElement _roleGlyph;
        readonly Label _role;
        readonly LuneHpBar _xp;
        readonly Label _xpText;
        readonly Label _hp;
        readonly LuneHpBar _hpBar;
        readonly LuneGlyphElement[] _slots = new LuneGlyphElement[LuneContent.ItemSlots];
        readonly LuneStatusBadge _talent;
        readonly VisualElement _empty;
        readonly VisualElement _filled;
        readonly List<LunePortraitElement> _faces = new List<LunePortraitElement>();
        readonly Label _emptyTitle;
        readonly Label _emptyPrice;
        readonly LuneGlyphElement _emptyCoin;
        readonly VisualElement _facesRow;
        /// <summary>Reserved: the ultimate of a planned hero (released through the command menu in combat).</summary>
        public readonly LuneButton CommandSlot;
        LuneHudModel _model;
        LuneUnit _live;
        HeroState _hero;
        UnitDef _definition;
        string _signature = "";

        public LuneHeroCard() : base(null, LuneButtons.HudCard)
        {
            style.minWidth = 320f;
            style.height = 132f;
            style.justifyContent = Justify.FlexStart;
            style.alignItems = Align.Stretch;
            style.paddingLeft = 8f;
            style.paddingRight = 8f;
            style.paddingTop = 8f;
            style.paddingBottom = 8f;
            _portrait = new LunePortraitElement();
            _portrait.style.width = 88f;
            Add(_portrait);
            _filled = LuneUi.Box(true, 2f, this);
            _filled.style.marginLeft = 10f;
            _filled.style.flexGrow = 1f;
            _filled.style.flexShrink = 1f;
            _filled.style.minWidth = 0f;
            _name = LuneUi.Clip(LuneUi.Label("", "HudName", _filled));
            VisualElement roleRow = LuneUi.Box(false, 5f, _filled);
            LuneUi.Glyph("star", LuneUiTheme.Hero, 13f, roleRow);
            _level = LuneUi.Label("", "HudValue", roleRow);
            _roleGlyph = LuneUi.Glyph("tank", LuneUiTheme.Muted, 14f, roleRow);
            _role = LuneUi.Label("", "HudMuted", roleRow);
            VisualElement xpRow = LuneUi.Box(false, 6f, _filled);
            _xp = new LuneHpBar(60f, 6f) { Fill = LuneUiTheme.BronzeLight };
            _xp.style.flexGrow = 1f;
            xpRow.Add(_xp);
            _xpText = LuneUi.Label("", "HudMuted", xpRow);
            VisualElement hpRow = LuneUi.Box(false, 5f, _filled);
            LuneUi.Glyph("heart", LuneUiTheme.Lightened(LuneUiTheme.Danger, .2f), 13f, hpRow);
            _hp = LuneUi.Label("", "HudText", hpRow);
            _hpBar = new LuneHpBar(50f, 5f);
            _hpBar.style.flexGrow = 1f;
            hpRow.Add(_hpBar);
            VisualElement itemRow = LuneUi.Box(false, 4f, _filled);
            for (int index = 0; index < _slots.Length; index++)
            {
                var box = new VisualElement { pickingMode = PickingMode.Ignore };
                box.style.width = 26f;
                box.style.height = 26f;
                box.style.backgroundColor = new Color(0f, 0f, 0f, .35f);
                box.style.borderTopLeftRadius = 3f;
                box.style.borderTopRightRadius = 3f;
                box.style.borderBottomLeftRadius = 3f;
                box.style.borderBottomRightRadius = 3f;
                box.style.borderLeftWidth = 1f;
                box.style.borderRightWidth = 1f;
                box.style.borderTopWidth = 1f;
                box.style.borderBottomWidth = 1f;
                Color edge = LuneUiTheme.Hex("33404d");
                box.style.borderLeftColor = edge;
                box.style.borderRightColor = edge;
                box.style.borderTopColor = edge;
                box.style.borderBottomColor = edge;
                box.style.paddingLeft = 4f;
                box.style.paddingTop = 4f;
                itemRow.Add(box);
                _slots[index] = LuneUi.Glyph("", Color.white, 18f, box);
            }
            _talent = new LuneStatusBadge();
            itemRow.Add(_talent);
            CommandSlot = new LuneButton("ULTIMATE", LuneButtons.HudPrimary, itemRow);
            CommandSlot.Clicked += () => CommandRequested?.Invoke();
            LuneUi.Show(CommandSlot, false);
            _empty = LuneUi.Box(true, 3f, this);
            _empty.style.marginLeft = 10f;
            _empty.style.flexGrow = 1f;
            _empty.style.justifyContent = Justify.Center;
            _emptyTitle = LuneUi.Label("HELD ANWERBEN", "HudName", _empty);
            _facesRow = LuneUi.Box(false, 4f, _empty);
            foreach (string id in LuneContent.Heroes.Keys)
            {
                var face = new LunePortraitElement();
                face.style.width = 38f;
                face.style.height = 38f;
                _facesRow.Add(face);
                _faces.Add(face);
            }
            VisualElement price = LuneUi.Box(false, 4f, _empty);
            _emptyCoin = LuneUi.Glyph("coin", LuneUiTheme.Gold, 14f, price);
            _emptyPrice = LuneUi.Label("", "HudMuted", price);
            LuneTooltip.Attach(this, Tip);
        }

        /// <summary>hero: the own hero (draft in planning) or null; live: the combat unit or null.</summary>
        public void Apply(HeroState hero, LuneHudModel model, LuneUnit live)
        {
            _model = model;
            _live = live;
            bool hasHero = hero != null;
            if (live != null && hasHero)
            {
                _hp.text = live.Alive ? LuneUiTheme.Number(live.Hp) + " / " + LuneUiTheme.Number(live.MaxHp) : "gefallen";
                _hpBar.Fraction = live.Alive ? (float)(live.Hp / Math.Max(1.0, live.MaxHp)) : 0f;
                _hpBar.Fill = LuneHpBar.HealthColor(_hpBar.Fraction, LuneUiTheme.Good);
                _portrait.Crossed = !live.Alive;
            }
            string signature = (hasHero ? hero.HeroId + ":" + hero.Xp + ":" + hero.Lane + ":" + string.Join(",", hero.Items) + ":" + string.Join(",", hero.Talents) + ":" + hero.Ultimate + ":" + hero.Skin : "-") + "|"
                + (live != null) + "|" + (live != null ? live.UltimateSerial : 0) + "|" + model.OwnGold + "|" + model.Planning;
            if (signature == _signature)
                return;
            _signature = signature;
            LuneUi.Show(_filled, hasHero);
            LuneUi.Show(_empty, !hasHero);
            _hero = hero;
            if (!hasHero)
            {
                HeroId = "";
                _definition = null;
                _portrait.ShowModel("w04");
                _portrait.Dimmed = true;
                _portrait.Crossed = false;
                int index = 0;
                foreach (HeroSpec spec in LuneContent.Heroes.Values)
                    _faces[index++].ShowModel(spec.Model);
                // In combat nobody can recruit: say so instead of offering it.
                bool planning = model.Planning;
                _emptyTitle.text = planning ? "HELD ANWERBEN" : "KEIN HELD";
                _emptyPrice.text = planning ? LuneContent.Heroes.Values[0].Cost + " · ein Held pro Spieler" : "Anwerben in der Planung";
                LuneUi.Show(_emptyCoin, planning);
                LuneUi.Show(_facesRow, planning);
                LuneUi.Show(CommandSlot, false);
                return;
            }
            HeroId = hero.HeroId;
            HeroSpec heroSpec = LuneContent.Heroes[HeroId];
            _definition = model.HeroDefinition(hero);
            _portrait.Dimmed = false;
            _portrait.Crossed = live != null && !live.Alive;
            _portrait.ShowModel(string.IsNullOrEmpty(hero.Skin) ? heroSpec.Model : heroSpec.Model + "#" + hero.Skin);
            _name.text = heroSpec.Name;
            int level = LuneContent.LevelFor(hero.Xp);
            _level.text = "STUFE " + level;
            _roleGlyph.Glyph = LuneStats.RoleGlyph(_definition.Role);
            _role.text = LuneStats.RoleName(_definition.Role);
            int[] levels = LuneContent.LevelXp;
            int low = levels[level - 1];
            bool top = level >= levels.Length;
            int high = levels[Math.Min(level, levels.Length - 1)];
            _xp.Fraction = top ? 1f : (float)(hero.Xp - low) / Math.Max(1, high - low);
            _xpText.text = top ? "EP " + hero.Xp + " · max" : "EP " + hero.Xp + " / " + high;
            LuneUi.Show(_hpBar, live != null);
            if (live == null)
                _hp.text = LuneUiTheme.Number(_definition.MaxHp) + " Leben";
            for (int index = 0; index < _slots.Length; index++)
            {
                string itemId = index < hero.Items.Count ? hero.Items[index] : "";
                _slots[index].Glyph = itemId;
                _slots[index].Color = LuneItemSlot.ColorOf(itemId);
            }
            int openTier = hero.Talents.Count;
            int[] talentLevels = LuneContent.TalentLevels;
            if (openTier < talentLevels.Length && level >= talentLevels[openTier])
            {
                _talent.SetState("TALENT!", LuneUiTheme.Hero, "star", true);
                LuneUi.Show(_talent, model.Planning);
            }
            else if (openTier < talentLevels.Length)
            {
                _talent.SetState("TALENT AB " + talentLevels[openTier], LuneUiTheme.Muted);
                LuneUi.Show(_talent, true);
            }
            else
            {
                LuneUi.Show(_talent, false);
            }
            // H1: heroes with an ultimate show it with its planned rule; the reference heroes have none.
            bool command = LuneContent.HasUltimate(HeroId);
            LuneUi.Show(CommandSlot, command);
            if (command)
            {
                string rule = LuneContent.UltimateRuleFor(hero);
                string ruleName = LuneContent.UltimateRulesOf(HeroId).First(r => r.Id == rule).Name;
                bool fired = _live != null && _live.UltimateSerial > 0;
                // Short: the slot shares the row with the item slots and the talent badge.
                CommandSlot.Text = fired ? "ULT GENUTZT" : "ULT · " + ruleName.ToUpperInvariant();
                CommandSlot.On = fired;
            }
        }

        LuneTip Tip()
        {
            if (_hero == null || _definition == null)
                return new LuneTip
                {
                    Title = "Held anwerben", Glyph = "crown", GlyphColor = LuneUiTheme.Hero,
                    Text = LuneContent.Heroes.Count + " Helden stehen zur Wahl; jeder Spieler führt einen. Helden sammeln Erfahrung, steigen bis Stufe 10 auf, tragen drei Items und wählen zwei Talente.",
                    Note = "Klick: Heldenauswahl öffnen",
                };
            HeroSpec spec = LuneContent.Heroes[_hero.HeroId];
            List<string> names = _hero.Items.Select(id => LuneContent.Items[id].Name).ToList();
            var tip = new LuneTip
            {
                Title = spec.Name + " · Stufe " + LuneContent.LevelFor(_hero.Xp), Glyph = "crown", GlyphColor = LuneUiTheme.Hero, Subtitle = spec.Title,
                Text = "Items: " + (names.Count > 0 ? string.Join(", ", names) : "keine"), Note = "Klick: Werte, Items und Talente · H: Kamera zum Helden",
            };
            tip.Stats.AddRange(LuneStats.Rows(_definition));
            return tip;
        }
    }

    /// <summary>
    /// Hero window content (Godot LuneHeroDetail). Without a hero: the three heroes with portrait,
    /// role, real stats and price to recruit one. With a hero: portrait, level and experience, lane
    /// order, and tabs for values and ability (from the rules' definitions, including level, items
    /// and talents), the three item slots with the item shop, and the two talent tiers. Only shows
    /// data; every change is a command through the game.
    /// </summary>
    public sealed class LuneHeroDetail : VisualElement
    {
        public const int TabValues = 0;
        public const int TabItems = 1;
        public const int TabTalents = 2;
        /// <summary>H1: ultimate rule and skin of heroes that have them.</summary>
        public const int TabUltimate = 3;

        public event Action<Command> CommandRequested;
        public int Tab = TabValues;
        public readonly Dictionary<string, LuneItemSlot> ItemCards = new Dictionary<string, LuneItemSlot>();
        public readonly Dictionary<string, LuneButton> RecruitButtons = new Dictionary<string, LuneButton>();
        public readonly Dictionary<string, LuneButton> LaneButtons = new Dictionary<string, LuneButton>();
        public readonly List<LuneButton> TalentCards = new List<LuneButton>();
        public readonly Dictionary<string, LuneButton> RuleCards = new Dictionary<string, LuneButton>();
        public readonly Dictionary<string, LuneButton> SkinCards = new Dictionary<string, LuneButton>();
        public LuneTabBar Tabs;
        LuneHudModel _model;
        string _signature = "";

        public LuneHeroDetail()
        {
            pickingMode = PickingMode.Ignore;
            style.flexGrow = 1f;
        }

        public void ShowTab(int index)
        {
            Tab = index;
            _signature = "";
            if (_model != null)
                Apply(_model);
        }

        public string TitleText(LuneHudModel model)
        {
            HeroState hero = model.OwnHero;
            return hero == null ? "HELD ANWERBEN" : "HELD · " + LuneContent.Heroes[hero.HeroId].Name.ToUpperInvariant();
        }

        public void Apply(LuneHudModel model)
        {
            _model = model;
            HeroState hero = model.OwnHero;
            string signature = (hero != null ? hero.HeroId + ":" + hero.Xp + ":" + hero.Lane + ":" + hero.Fresh + ":" + string.Join(",", hero.Items) + ":" + string.Join(",", hero.Talents) + ":" + string.Join(",", hero.FreshItems) + ":" + hero.Ultimate + ":" + hero.Skin : "-")
                + "|" + model.OwnGold + "|" + model.Planning + "|" + model.Locked + "|" + Tab + "|" + model.State.GrottoAvailable() + "|" + model.State.RoundNumber;
            if (signature == _signature)
                return;
            _signature = signature;
            Clear();
            ItemCards.Clear();
            RecruitButtons.Clear();
            LaneButtons.Clear();
            TalentCards.Clear();
            RuleCards.Clear();
            SkinCards.Clear();
            Tabs = null;
            if (hero == null)
                Recruit(model);
            else
                ShowHero(model, hero);
        }

        static bool CanAct(LuneHudModel model) { return model.Planning && !model.Locked; }

        static string WhyNot(LuneHudModel model)
        {
            if (!model.Planning)
                return "Nur in der Planung.";
            if (model.Locked)
                return "Bereit gemeldet – die Planung ist verbindlich.";
            return "";
        }

        void Recruit(LuneHudModel model)
        {
            LuneUi.Wrap(LuneUi.Label("Jeder Spieler führt einen Helden. Er kämpft auf seiner Lane mit, sammelt Erfahrung aus Gefechten in seiner Nähe und aus jeder Runde, trägt drei Items und wählt ab Stufe 3 und 6 je ein Talent.", "HudMuted", this));
            VisualElement row = LuneUi.Box(false, 12f, this);
            row.style.alignItems = Align.Stretch;
            row.style.flexGrow = 1f;
            row.style.marginTop = 10f;
            int gold = model.OwnGold;
            foreach (KeyValuePair<string, HeroSpec> pair in LuneContent.Heroes)
            {
                string heroId = pair.Key;
                HeroSpec spec = pair.Value;
                var panel = new LunePanel(LunePanels.HudTight);
                panel.style.flexGrow = 1f;
                panel.style.flexBasis = 0f;
                row.Add(panel);
                VisualElement column = LuneUi.Box(true, 5f, panel);
                column.style.flexGrow = 1f;
                var portrait = new LunePortraitElement();
                portrait.style.height = 170f;
                column.Add(portrait);
                portrait.ShowModel(spec.Model, true);
                LuneUi.Label(spec.Name, "HudTitle", column);
                LuneUi.Label(spec.Title, "HudMuted", column);
                UnitDef definition = model.HeroDefinition(new HeroState { HeroId = heroId });
                VisualElement role = LuneUi.Box(false, 5f, column);
                LuneUi.Glyph(LuneStats.RoleGlyph(definition.Role), LuneUiTheme.BronzeLight, 15f, role);
                LuneUi.Label(spec.RoleText, "HudText", role);
                foreach (string[] entry in LuneStats.Rows(definition).Take(5))
                {
                    VisualElement line = LuneUi.Box(false, 6f, column);
                    LuneUi.Glyph(entry[0], LuneUiTheme.Muted, 13f, line);
                    LuneUi.Label(entry[1], "HudMuted", line).style.minWidth = 104f;
                    LuneUi.Clip(LuneUi.Label(entry[2], "HudText", line)).style.flexGrow = 1f;
                }
                Label summary = LuneUi.Wrap(LuneUi.Label(spec.Summary, "HudText", column));
                summary.style.flexGrow = 1f;
                int cost = spec.Cost;
                var buy = new LuneButton("ANWERBEN · " + cost + " G", LuneButtons.HudPrimary, column);
                string why = WhyNot(model);
                if (why.Length == 0 && gold < cost)
                    why = "Es fehlen " + (cost - gold) + " Gold.";
                buy.Disabled = why.Length > 0;
                buy.Clicked += () => CommandRequested?.Invoke(Command.HeroBuy(heroId));
                RecruitButtons[heroId] = buy;
                if (why.Length > 0)
                    LuneUi.SetColor(LuneUi.Wrap(LuneUi.Label(why, "HudMuted", column)), gold < cost ? LuneUiTheme.Danger : LuneUiTheme.Muted);
                if (spec.Provisional)
                    LuneUi.Wrap(LuneUi.Label("Vorläufige Rolle des vorhandenen Modells.", "HudMuted", column));
                else if (spec.UltimateName.Length > 0)
                    LuneUi.SetColor(LuneUi.Label("Ultimate: " + spec.UltimateName, "HudText", column), LuneUiTheme.Hero);
            }
        }

        void ShowHero(LuneHudModel model, HeroState hero)
        {
            HeroSpec spec = LuneContent.Heroes[hero.HeroId];
            UnitDef definition = model.HeroDefinition(hero);
            bool canAct = CanAct(model);
            VisualElement body = LuneUi.Box(false, 18f, this);
            body.style.alignItems = Align.Stretch;
            body.style.flexGrow = 1f;
            VisualElement left = LuneUi.Box(true, 6f, body);
            left.style.width = 290f;
            var portrait = new LunePortraitElement();
            portrait.style.width = 290f;
            portrait.style.height = 230f;
            left.Add(portrait);
            portrait.ShowModel(string.IsNullOrEmpty(hero.Skin) ? spec.Model : spec.Model + "#" + hero.Skin, true);
            LuneUi.Label(spec.Title, "HudMuted", left);
            VisualElement role = LuneUi.Box(false, 6f, left);
            LuneUi.Glyph(LuneStats.RoleGlyph(definition.Role), LuneUiTheme.BronzeLight, 16f, role);
            LuneUi.Label(spec.RoleText, "HudText", role);
            int level = LuneContent.LevelFor(hero.Xp);
            int[] levels = LuneContent.LevelXp;
            VisualElement levelRow = LuneUi.Box(false, 6f, left);
            LuneUi.Glyph("star", LuneUiTheme.Hero, 16f, levelRow);
            LuneUi.Label("STUFE " + level + " / " + levels.Length, "HudValue", levelRow);
            var bar = new LuneHpBar(0f, 8f) { Fill = LuneUiTheme.BronzeLight };
            left.Add(bar);
            bool top = level >= levels.Length;
            int low = levels[level - 1];
            int high = levels[Math.Min(level, levels.Length - 1)];
            bar.Fraction = top ? 1f : (float)(hero.Xp - low) / Math.Max(1, high - low);
            LuneUi.Label(top ? hero.Xp + " EP · Höchststufe" : hero.Xp + " / " + high + " EP · noch " + (high - hero.Xp) + " bis Stufe " + (level + 1), "HudMuted", left);
            LuneUi.Label("EINSATZ", "HudCaps", left);
            VisualElement lanes = LuneUi.Box(false, 4f, left);
            foreach (string lane in LuneMap.Lanes.Concat(new[] { LuneMatch.Grotto }))
            {
                string title = lane == LuneMatch.Grotto ? "GROTTE" : LuneUi.Upper(LuneMap.LaneNames[lane]);
                var button = new LuneButton(title, LuneButtons.HudToggle, lanes);
                button.style.flexGrow = 1f;
                button.On = hero.Lane == lane;
                button.Disabled = !canAct || (lane == LuneMatch.Grotto && !model.State.GrottoAvailable());
                string uid = hero.Uid;
                string captured = lane;
                button.Clicked += () => CommandRequested?.Invoke(Command.Assign(uid, captured));
                LaneButtons[lane] = button;
            }
            if (hero.Lane == LuneMatch.Grotto)
                LuneUi.SetColor(LuneUi.Wrap(LuneUi.Label("Der Held fehlt seiner Lane in der nächsten Kampfphase.", "HudText", left)), LuneUiTheme.Warn);
            if (hero.Fresh && model.Planning)
            {
                int refund = hero.Invested + hero.Items.Sum(id => LuneContent.Items[id].Cost);
                // Godot: a plain button in the column fills its width.
                var cancel = new LuneButton("Held zurückgeben +" + refund, LuneButtons.HudButton, left);
                cancel.Disabled = !canAct;
                cancel.Clicked += () => CommandRequested?.Invoke(Command.HeroCancel());
            }
            VisualElement right = LuneUi.Box(true, 8f, body);
            right.style.flexGrow = 1f;
            right.style.flexShrink = 1f;
            right.style.minWidth = 0f;
            Tabs = new LuneTabBar();
            right.Add(Tabs);
            Tabs.AddTab("WERTE & FÄHIGKEIT");
            Tabs.AddTab("ITEMS " + hero.Items.Count + "/" + LuneContent.ItemSlots);
            int openTier = hero.Talents.Count;
            int[] talentLevels = LuneContent.TalentLevels;
            bool talentReady = openTier < talentLevels.Length && level >= talentLevels[openTier];
            LuneButton talents = Tabs.AddTab("TALENTE");
            if (talentReady)
                LuneUi.Glyph("star", LuneUiTheme.Hero, 13f, talents).style.marginLeft = 5f;
            bool special = LuneContent.HasUltimate(hero.HeroId) || LuneContent.SkinsOf(hero.HeroId).Length > 0;
            if (special)
                Tabs.AddTab("ULTIMATE & SKIN");
            if (Tab == TabUltimate && !special)
                Tab = TabValues;
            Tabs.Select(Tab);
            Tabs.TabChanged += ShowTab;
            VisualElement page = LuneUi.Box(true, 8f, right);
            page.style.flexGrow = 1f;
            if (Tab == TabItems)
                Items(model, hero, level, page);
            else if (Tab == TabTalents)
                Talents(model, hero, level, page);
            else if (Tab == TabUltimate)
                Ultimate(model, hero, spec, page);
            else
                Values(hero, definition, spec, page);
        }

        static void Values(HeroState hero, UnitDef definition, HeroSpec spec, VisualElement page)
        {
            List<string[]> rows = LuneStats.Rows(definition, true);
            rows.Add(new[] { "sword", "Schaden/Sekunde", "≈ " + LuneUiTheme.Decimal(LuneStats.Dps(definition)) + " (ohne Fähigkeit)" });
            VisualElement grid = LuneUi.Box(true, 3f, page);
            foreach (string[] entry in rows)
            {
                VisualElement line = LuneUi.Box(false, 10f, grid);
                LuneUi.Glyph(entry[0], LuneUiTheme.Muted, 15f, line);
                LuneUi.Label(entry[1], "HudMuted", line).style.minWidth = 130f;
                LuneUi.Wrap(LuneUi.Label(entry[2], "HudText", line)).style.flexGrow = 1f;
            }
            UnitDef baseDef = spec.Base;
            LuneUi.Wrap(LuneUi.Label("Grundwerte " + LuneUiTheme.Number(baseDef.MaxHp) + " Leben, " + LuneUiTheme.Decimal(baseDef.Damage) + " Schaden; je Stufe +" + LuneUiTheme.Round(LuneContent.HpPerLevel * 100.0)
                + " % Leben und +" + LuneUiTheme.Round(LuneContent.DamagePerLevel * 100.0) + " % Schaden (jetzt Stufe " + definition.Level + ").", "HudMuted", page));
            LuneUi.Label("FÄHIGKEIT", "HudCaps", page);
            // H1 heroes bring their own kit text; the reference heroes use their troop model's ability.
            string ability = spec.AbilityText.Length > 0 ? spec.AbilityText : DataCatalog.GetUnit(spec.Model).AbilityDescription ?? "";
            if (spec.PassiveText.Length > 0)
                ability = spec.PassiveText + "\n" + ability;
            if (spec.UltimateName.Length > 0)
                ability += "\nUltimate " + spec.UltimateName + ": " + spec.UltimateText;
            LuneUi.Wrap(LuneUi.Label(ability, "HudText", page));
            var chosen = new List<string>();
            TalentOption[][] options = LuneContent.TalentsOf(hero.HeroId);
            for (int tier = 0; tier < hero.Talents.Count; tier++)
            {
                foreach (TalentOption option in options[tier])
                {
                    if (option.Id == hero.Talents[tier])
                        chosen.Add(option.Name + ": " + option.Text);
                }
            }
            if (chosen.Count > 0)
            {
                LuneUi.Label("TALENTE", "HudCaps", page);
                LuneUi.Wrap(LuneUi.Label(string.Join("\n", chosen), "HudText", page));
            }
            LuneUi.Wrap(LuneUi.Label("Erfahrung: Tode von Gegnern in " + (int)LuneContent.XpRadius + " m (Monster 12 + Welle, Champion 30 + 2 × Welle, Gebäude " + LuneContent.BuildingXp + ", Boss " + LuneContent.BossXp
                + ") und je Kampf " + LuneContent.XpParticipation + " + " + LuneContent.XpPerRound + " × Welle.", "HudMuted", page));
        }

        void Items(LuneHudModel model, HeroState hero, int level, VisualElement page)
        {
            bool canAct = CanAct(model);
            List<string> items = hero.Items;
            VisualElement slots = LuneUi.Box(false, 10f, page);
            slots.style.alignItems = Align.FlexStart;
            for (int index = 0; index < LuneContent.ItemSlots; index++)
            {
                VisualElement box = LuneUi.Box(true, 3f, slots);
                box.style.flexGrow = 1f;
                box.style.flexBasis = 0f;
                var slot = new LuneItemSlot(true);
                slot.style.width = 46f;
                slot.style.height = 46f;
                box.Add(slot);
                if (index < items.Count)
                {
                    string itemId = items[index];
                    ItemSpec item = LuneContent.Items[itemId];
                    slot.SetItem(itemId, LuneItemSlot.State.Equipped);
                    LuneTooltip.Attach(slot, () => new LuneTip { Title = item.Name, Glyph = itemId, GlyphColor = LuneItemSlot.ColorOf(itemId), Text = item.Text });
                    LuneUi.Label(item.Name, "HudText", box);
                    bool fresh = hero.FreshItems.Contains(itemId);
                    int refund = fresh ? item.Cost : (int)Math.Floor(item.Cost * LuneContent.ItemRefund);
                    var sell = new LuneButton("Verkaufen +" + refund, LuneButtons.HudButton, box);
                    sell.style.alignSelf = Align.FlexStart;
                    sell.Disabled = !canAct;
                    sell.Clicked += () => CommandRequested?.Invoke(Command.ItemSell(itemId));
                }
                else
                {
                    slot.SetItem("", LuneItemSlot.State.Empty);
                    LuneUi.Label("Platz " + (index + 1) + " frei", "HudMuted", box);
                }
            }
            LuneUi.Label("ITEMS · einzigartig je Held, bleiben dauerhaft, Rückgabe " + LuneUiTheme.Round(LuneContent.ItemRefund * 100.0) + " %", "HudCaps", page);
            VisualElement grid = LuneUi.Box(true, 8f, page);
            int gold = model.OwnGold;
            VisualElement line = null;
            int column = 0;
            foreach (KeyValuePair<string, ItemSpec> pair in LuneContent.Items)
            {
                string itemId = pair.Key;
                ItemSpec item = pair.Value;
                if (column % 2 == 0)
                    line = LuneUi.Box(false, 8f, grid);
                column++;
                var card = new LuneItemSlot(false);
                card.style.flexGrow = 1f;
                card.style.flexBasis = 0f;
                line.Add(card);
                LuneItemSlot.State state = LuneItemSlot.State.Available;
                if (items.Contains(itemId))
                    state = LuneItemSlot.State.Unique;
                else if (!canAct)
                    state = LuneItemSlot.State.Locked;
                else if (level < item.MinLevel)
                    state = LuneItemSlot.State.Incompatible;
                else if (items.Count >= LuneContent.ItemSlots)
                    state = LuneItemSlot.State.Full;
                else if (gold < item.Cost)
                    state = LuneItemSlot.State.Unaffordable;
                card.SetItem(itemId, state);
                ItemCards[itemId] = card;
                string uid = hero.Uid;
                card.Clicked += () =>
                {
                    if (card.Current == LuneItemSlot.State.Available)
                        CommandRequested?.Invoke(Command.ItemBuy(itemId, uid));
                };
                string why = state == LuneItemSlot.State.Unique ? "Dein Held trägt es bereits; Items sind einzigartig."
                    : state == LuneItemSlot.State.Locked ? WhyNot(model)
                    : state == LuneItemSlot.State.Incompatible ? "Erfordert Heldenstufe " + item.MinLevel + "."
                    : state == LuneItemSlot.State.Full ? "Alle " + LuneContent.ItemSlots + " Plätze belegt; verkaufe zuerst ein Item."
                    : state == LuneItemSlot.State.Unaffordable ? "Es fehlen " + (item.Cost - gold) + " Gold."
                    : "Klick: kaufen und ausrüsten.";
                LuneTooltip.Attach(card, () => new LuneTip { Title = item.Name + " · " + item.Cost + " Gold", Glyph = itemId, GlyphColor = LuneItemSlot.ColorOf(itemId), Text = item.Text, Note = why });
            }
        }

        void Talents(LuneHudModel model, HeroState hero, int level, VisualElement page)
        {
            bool canAct = CanAct(model);
            List<string> talents = hero.Talents;
            int[] talentLevels = LuneContent.TalentLevels;
            TalentOption[][] options = LuneContent.TalentsOf(hero.HeroId);
            for (int tier = 0; tier < talentLevels.Length; tier++)
            {
                int required = talentLevels[tier];
                string state = tier < talents.Count ? "gewählt" : level >= required && tier == talents.Count ? "jetzt wählbar" : "ab Stufe " + required;
                LuneUi.Label("TALENT " + (tier + 1) + " · STUFE " + required + " · " + state.ToUpperInvariant(), "HudCaps", page);
                VisualElement row = LuneUi.Box(false, 8f, page);
                row.style.alignItems = Align.Stretch;
                for (int choice = 0; choice < options[tier].Length; choice++)
                {
                    TalentOption option = options[tier][choice];
                    var card = new LuneButton(null, LuneButtons.HudCard, row);
                    card.style.flexGrow = 1f;
                    card.style.flexBasis = 0f;
                    card.style.minHeight = 96f;
                    card.style.flexDirection = FlexDirection.Column;
                    card.style.alignItems = Align.Stretch;
                    card.style.justifyContent = Justify.FlexStart;
                    card.style.paddingLeft = 10f;
                    card.style.paddingRight = 10f;
                    card.style.paddingTop = 8f;
                    card.style.paddingBottom = 8f;
                    LuneUi.Label(option.Name, "HudValue", card);
                    LuneUi.Wrap(LuneUi.Label(option.Text, "HudMuted", card));
                    bool chosen = tier < talents.Count && talents[tier] == option.Id;
                    card.On = chosen;
                    card.Disabled = !(canAct && tier == talents.Count && level >= required) && !chosen;
                    int capturedTier = tier;
                    int capturedChoice = choice;
                    card.Clicked += () =>
                    {
                        if (!chosen)
                            CommandRequested?.Invoke(Command.Talent(capturedTier, capturedChoice));
                    };
                    TalentCards.Add(card);
                }
            }
            LuneUi.Wrap(LuneUi.Label("Die Wahl ist endgültig; jede Stufe bietet zwei Richtungen (Einzelziel oder Fläche, Schutz oder Druck).", "HudMuted", page));
        }

        /// <summary>
        /// H1: the ultimate and its trigger rule (one charge per combat, released automatically
        /// when the rule holds; the rule can change in every planning), and the cosmetic skins.
        /// </summary>
        void Ultimate(LuneHudModel model, HeroState hero, HeroSpec spec, VisualElement page)
        {
            bool canAct = CanAct(model);
            TalentOption[] rules = LuneContent.UltimateRulesOf(hero.HeroId);
            if (rules.Length > 0)
            {
                LuneUi.Label("ULTIMATE · " + spec.UltimateName.ToUpperInvariant(), "HudCaps", page);
                LuneUi.Wrap(LuneUi.Label(spec.UltimateText, "HudText", page));
                LuneUi.Label("AUSLÖSER · jederzeit in der Planung änderbar, kostenlos", "HudCaps", page);
                string current = LuneContent.UltimateRuleFor(hero);
                VisualElement row = LuneUi.Box(false, 8f, page);
                row.style.alignItems = Align.Stretch;
                foreach (TalentOption rule in rules)
                {
                    var card = new LuneButton(null, LuneButtons.HudCard, row);
                    card.style.flexGrow = 1f;
                    card.style.flexBasis = 0f;
                    card.style.minHeight = 84f;
                    card.style.flexDirection = FlexDirection.Column;
                    card.style.alignItems = Align.Stretch;
                    card.style.justifyContent = Justify.FlexStart;
                    card.style.paddingLeft = 8f;
                    card.style.paddingRight = 8f;
                    card.style.paddingTop = 6f;
                    card.style.paddingBottom = 6f;
                    LuneUi.Label(rule.Name + (rule == rules[0] ? " (Standard)" : ""), "HudValue", card);
                    LuneUi.Wrap(LuneUi.Label(rule.Text, "HudMuted", card));
                    bool on = rule.Id == current;
                    card.On = on;
                    card.Disabled = !canAct && !on;
                    string id = rule.Id;
                    card.Clicked += () =>
                    {
                        if (!on)
                            CommandRequested?.Invoke(Command.UltimateRule(id));
                    };
                    RuleCards[id] = card;
                }
            }
            TalentOption[] skins = LuneContent.SkinsOf(hero.HeroId);
            if (skins.Length == 0)
                return;
            LuneUi.Label("SKIN · nur das Aussehen, für alle sichtbar", "HudCaps", page);
            VisualElement looks = LuneUi.Box(false, 8f, page);
            looks.style.alignItems = Align.Stretch;
            var options = new List<TalentOption> { new TalentOption("", "Mondsilber", "Standard-Aussehen.") };
            options.AddRange(skins);
            foreach (TalentOption skin in options)
            {
                var card = new LuneButton(null, LuneButtons.HudCard, looks);
                card.style.width = 170f;
                card.style.flexDirection = FlexDirection.Column;
                card.style.alignItems = Align.Stretch;
                card.style.paddingLeft = 6f;
                card.style.paddingRight = 6f;
                card.style.paddingTop = 6f;
                card.style.paddingBottom = 6f;
                var face = new LunePortraitElement();
                face.style.height = 120f;
                face.pickingMode = PickingMode.Ignore;
                card.Add(face);
                face.ShowModel(skin.Id.Length == 0 ? spec.Model : spec.Model + "#" + skin.Id, true);
                LuneUi.Label(skin.Name, "HudValue", card);
                bool on = (hero.Skin ?? "") == skin.Id;
                card.On = on;
                card.Disabled = !canAct && !on;
                string id = skin.Id;
                card.Clicked += () =>
                {
                    if (!on)
                        CommandRequested?.Invoke(Command.HeroSkin(id));
                };
                LuneTooltip.Attach(card, () => new LuneTip { Title = skin.Name, Glyph = "crown", GlyphColor = LuneUiTheme.Hero, Text = skin.Text });
                SkinCards[id] = card;
            }
        }
    }
}