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

namespace Luneraria.UI
{
    /// <summary>
    /// Attack champions (Godot LuneChampionPanel): target lane, the three champion cards (copper,
    /// hatched, "1 WELLE") and the own bookings ("Einsatz in Welle 15 – MID"). Champions are bought
    /// in planning n, fight once in wave n+1 and then vanish; they never join the permanent army.
    /// </summary>
    public sealed class LuneChampionPanel : VisualElement
    {
        public event Action<Command> CommandRequested;
        public string TargetLane = "mid";
        public readonly Dictionary<string, LuneUnitCard> Cards = new Dictionary<string, LuneUnitCard>();
        public readonly Dictionary<string, LuneButton> LaneButtons = new Dictionary<string, LuneButton>();
        readonly VisualElement _bookings;
        readonly Label _count;
        string _signature = "";
        LuneHudModel _model;

        public LuneChampionPanel()
        {
            pickingMode = PickingMode.Ignore;
            style.flexDirection = FlexDirection.Row;
            style.alignItems = Align.FlexStart;
            VisualElement lanes = LuneUi.Box(true, 4f, this);
            LuneUi.Label("ZIEL", "HudCaps", lanes);
            foreach (string lane in LuneMap.Lanes)
            {
                var button = new LuneButton(LuneUi.Upper(LuneMap.LaneNames[lane]), LuneButtons.HudToggle, lanes);
                button.style.minWidth = 86f;
                button.On = lane == TargetLane;
                string captured = lane;
                button.Clicked += () =>
                {
                    TargetLane = captured;
                    _signature = "";
                    foreach (KeyValuePair<string, LuneButton> pair in LaneButtons)
                        pair.Value.On = pair.Key == captured;
                    if (_model != null)
                        Apply(_model);
                };
                LaneButtons[lane] = button;
                LuneTooltip.Attach(button, () => new LuneTip { Title = "Ziel-Lane " + LuneMap.LaneNames[captured], Text = "Gebuchte Champions greifen in der nächsten Welle auf dieser Lane an." });
            }
            VisualElement row = LuneUi.Box(false, 6f, this);
            row.style.marginLeft = 10f;
            row.style.alignItems = Align.FlexStart;
            foreach (KeyValuePair<string, ChampionSpec> pair in LuneContent.Champions)
            {
                string championId = pair.Key;
                ChampionSpec spec = pair.Value;
                var card = new LuneUnitCard();
                row.Add(card);
                string role = championId == "ch_schutz" ? "schutz" : championId == "ch_druck" ? "druck" : championId == "ch_belagerung" ? "siege" : "melee";
                card.Setup(championId, spec.Model, spec.Name, role, spec.Cost, "", true, DataCatalog.GetSend(spec.Base));
                card.Clicked += () => CommandRequested?.Invoke(Command.ChampionBook(championId, TargetLane));
                Cards[championId] = card;
                LuneTooltip.Attach(card, () => Tip(championId));
            }
            VisualElement right = LuneUi.Box(true, 4f, this);
            right.style.marginLeft = 10f;
            right.style.flexGrow = 1f;
            right.style.flexShrink = 1f;
            right.style.minWidth = 200f;
            VisualElement head = LuneUi.Box(false, 0f, right);
            LuneUi.Label("EINSÄTZE", "HudCaps", head).style.flexGrow = 1f;
            _count = LuneUi.Label("", "HudMuted", head);
            _bookings = LuneUi.Box(true, 3f, right);
        }

        public void Apply(LuneHudModel model)
        {
            _model = model;
            List<LuneHudModel.BookingView> bookings = model.OwnBookings();
            int fresh = model.Planning ? model.Me.Draft.NewBookings.Count : 0;
            int gold = model.OwnGold;
            string signature = string.Join(",", bookings) + "|" + gold + "|" + model.Planning + "|" + model.Locked + "|" + TargetLane + "|" + model.State.RoundNumber;
            if (signature == _signature)
                return;
            _signature = signature;
            bool canAct = model.Planning && !model.Locked;
            foreach (KeyValuePair<string, LuneUnitCard> pair in Cards)
            {
                int cost = LuneContent.Champions[pair.Key].Cost;
                string why = "";
                if (!model.Planning)
                    why = "Buchungen nur in der Planung.";
                else if (model.Locked)
                    why = "Bereit gemeldet – die Planung ist verbindlich.";
                else if (fresh >= LuneContent.MaxBookings)
                    why = "Höchstens " + LuneContent.MaxBookings + " Champions pro Runde.";
                else if (gold < cost)
                    why = "Es fehlen " + (cost - gold) + " Gold.";
                pair.Value.SetAvailable(why.Length == 0, why, !canAct, gold < cost);
            }
            _count.text = fresh + "/" + LuneContent.MaxBookings + " diese Runde";
            _bookings.Clear();
            if (bookings.Count == 0)
            {
                LuneUi.Wrap(LuneUi.Label("Keine Champions gebucht. Kauf jetzt – Einsatz in Welle " + (model.State.RoundNumber + (model.Planning ? 1 : 2)) + ".", "HudMuted", _bookings));
                return;
            }
            foreach (LuneHudModel.BookingView booking in bookings)
            {
                VisualElement line = LuneUi.Box(false, 6f, _bookings);
                LuneUi.Glyph("hourglass", LuneUiTheme.Champion, 14f, line);
                bool running = booking.DeployRound == model.State.RoundNumber;
                VisualElement texts = LuneUi.Box(true, -2f, line);
                texts.style.flexGrow = 1f;
                LuneUi.Label(LuneContent.Champions[booking.ChampionId].Name, "HudText", texts);
                LuneUi.Label("Einsatz in Welle " + booking.DeployRound + " – " + LuneUi.Upper(LuneMap.LaneNames[booking.Lane]) + (running ? " (jetzt)" : ""), "HudMuted", texts);
                if (booking.Fresh)
                {
                    var cancel = new LuneButton("×", LuneButtons.HudIconButton, line);
                    cancel.Disabled = !canAct;
                    string uid = booking.Uid;
                    cancel.Clicked += () => CommandRequested?.Invoke(Command.ChampionCancel(uid));
                    LuneTooltip.Attach(cancel, () => new LuneTip { Title = "Buchung zurücknehmen", Text = "Volle Erstattung, solange die Planung läuft." });
                }
            }
        }

        LuneTip Tip(string championId)
        {
            ChampionSpec spec = LuneContent.Champions[championId];
            int round = _model != null ? _model.State.RoundNumber + 1 : 2;
            UnitDef definition = LuneContent.ChampionDefinition(championId, round, _model != null ? _model.State.Balance : LuneBalance.Default());
            var tip = new LuneTip
            {
                Title = spec.Name + " · Angriffschampion", Glyph = "champion", GlyphColor = LuneUiTheme.Champion,
                Subtitle = spec.RoleText + " · " + spec.Cost + " Gold · Einsatz in Welle " + round + " – " + LuneUi.Upper(LuneMap.LaneNames[TargetLane]),
                // S1 (Legion TD 2): sending is also an investment in income.
                Text = spec.Text + (_model != null && _model.State.Extended ? "\nSöldner-Einkommen: +" + _model.State.ChampionIncome(spec.Cost) + " Gold in jeder folgenden Runde, dauerhaft." : ""),
                Note = "Einmaliger Einsatz: kämpft eine Welle lang und verschwindet danach. Die Ankündigung ist für alle sichtbar; sein Tod bringt dem Gegner " + (_model != null ? _model.State.ChampionBountyFor(definition.Bounty) : definition.Bounty) + " Gold.",
                Warn = Cards[championId].Reason,
            };
            tip.Stats.AddRange(LuneStats.Rows(definition));
            return tip;
        }
    }

    /// <summary>
    /// The selected normal unit (Godot LuneUnitDetail): portrait, name, stage, role, HP, damage,
    /// tempo, range, armour, ability, upgrade with cost and stat change, return value, and the lane
    /// order with TOP, MID, BOTTOM and GROTTE (only allowed options active). Normal units carry no
    /// items. In combat or after Ready it only informs.
    /// </summary>
    public sealed class LuneUnitDetail : LunePanel
    {
        public const string GrottoWarning = "Diese Einheit fehlt deiner Lane in der nächsten Kampfphase.";
        public event Action<Command> CommandRequested;
        public event Action Closed;
        public string Uid = "";
        readonly LunePortraitElement _portrait;
        readonly Label _name;
        readonly Label _sub;
        readonly LuneHpBar _live;
        readonly VisualElement _stats;
        readonly Label _ability;
        readonly Label _types;
        readonly Label _upgradeTitle;
        readonly Label _upgradeDelta;
        public readonly LuneButton UpgradeButton;
        public readonly LuneButton SellButton;
        readonly Label _sellNote;
        public readonly Dictionary<string, LuneButton> LaneButtons = new Dictionary<string, LuneButton>();
        readonly Label _warning;
        readonly Label _locked;
        string _signature = "";

        public LuneUnitDetail() : base(LunePanels.Hud)
        {
            VisualElement column = LuneUi.Box(true, 5f, this);
            VisualElement head = LuneUi.Box(false, 10f, column);
            head.style.alignItems = Align.FlexStart;
            _portrait = new LunePortraitElement();
            _portrait.style.width = 76f;
            _portrait.style.height = 76f;
            head.Add(_portrait);
            VisualElement titles = LuneUi.Box(true, 2f, head);
            titles.style.flexGrow = 1f;
            titles.style.flexShrink = 1f;
            titles.style.minWidth = 0f;
            _name = LuneUi.Wrap(LuneUi.Label("", "HudName", titles));
            _sub = LuneUi.Wrap(LuneUi.Label("", "HudMuted", titles));
            _live = new LuneHpBar(0f, 6f);
            titles.Add(_live);
            var close = new LuneButton(null, LuneButtons.HudIconButton, head);
            close.style.width = 32f;
            close.style.height = 30f;
            LuneUi.Glyph("close", LuneUiTheme.Muted, 12f, close);
            close.Clicked += () => Closed?.Invoke();
            LuneTooltip.Attach(close, () => new LuneTip { Title = "Auswahl aufheben", Text = "Esc" });
            _stats = LuneUi.Box(true, 2f, column);
            LuneTooltip.Attach(_stats, StatsTip);
            _types = LuneUi.Wrap(LuneUi.Label("", "HudMuted", column));
            _ability = LuneUi.Wrap(LuneUi.Label("", "HudText", column));
            VisualElement upgradeBox = LuneUi.Box(true, 2f, column);
            VisualElement upgradeRow = LuneUi.Box(false, 8f, upgradeBox);
            _upgradeTitle = LuneUi.Wrap(LuneUi.Label("", "HudText", upgradeRow));
            _upgradeTitle.style.flexGrow = 1f;
            UpgradeButton = new LuneButton("", LuneButtons.HudPrimary, upgradeRow);
            UpgradeButton.Clicked += () => CommandRequested?.Invoke(Command.Upgrade(Uid));
            _upgradeDelta = LuneUi.Wrap(LuneUi.Label("", "HudMuted", upgradeBox));
            VisualElement laneRow = LuneUi.Box(false, 4f, column);
            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, laneRow);
                button.style.flexGrow = 1f;
                string captured = lane;
                button.Clicked += () => CommandRequested?.Invoke(Command.Assign(Uid, captured));
                LaneButtons[lane] = button;
                LuneTooltip.Attach(button, () => new LuneTip { Title = "Einsatz: " + title,
                    Text = captured == LuneMatch.Grotto ? GrottoWarning : "Kämpft in der nächsten Welle auf der " + LuneMap.LaneNames[captured] + "-Lane." });
            }
            _warning = LuneUi.Wrap(LuneUi.Label(GrottoWarning, "HudText", column));
            LuneUi.SetColor(_warning, LuneUiTheme.Warn);
            VisualElement sellRow = LuneUi.Box(false, 8f, column);
            SellButton = new LuneButton("", LuneButtons.HudButton, sellRow);
            SellButton.Clicked += () => CommandRequested?.Invoke(Command.Sell(Uid));
            _sellNote = LuneUi.Wrap(LuneUi.Label("", "HudMuted", sellRow));
            _sellNote.style.flexGrow = 1f;
            _locked = LuneUi.Wrap(LuneUi.Label("", "HudMuted", column));
        }

        /// <summary>entry: own roster entry; live: the unit in combat or null.</summary>
        public void Apply(RosterEntry entry, LuneHudModel model, LuneUnit live)
        {
            Uid = entry.Uid;
            LuneHudModel.TroopInfo data = model.Troop(entry.TypeId);
            bool planning = model.Planning;
            bool locked = model.Locked;
            int gold = model.OwnGold;
            string signature = entry.Uid + ":" + entry.TypeId + ":" + entry.Lane + ":" + entry.Invested + ":" + entry.Fresh + "|" + planning + "|" + locked + "|" + gold + "|"
                + model.State.GrottoAvailable() + "|" + (live != null) + "|" + model.State.RoundNumber;
            if (live != null)
            {
                _live.Fraction = live.Alive ? (float)(live.Hp / Math.Max(1.0, live.MaxHp)) : 0f;
                _live.Fill = LuneHpBar.HealthColor(_live.Fraction, LuneUiTheme.TeamColor(model.Team));
            }
            LuneUi.Show(_live, live != null);
            if (signature == _signature)
                return;
            _signature = signature;
            UnitDef def = data.Def;
            _portrait.ShowModel(entry.TypeId);
            _name.text = def.DisplayName;
            string laneText = entry.Lane == LuneMatch.Grotto ? "Grotte" : LuneMap.LaneNames[entry.Lane];
            _sub.text = LuneStats.RoleName(data.Role) + " · Stufe " + (data.Stage == 2 ? "II" : "I") + " · " + laneText + (live != null && !live.Alive ? " · gefallen" : "");
            _stats.Clear();
            List<string[]> rows = LuneStats.ShortRows(def);
            for (int index = 0; index < 4; index += 2)
            {
                VisualElement line = LuneUi.Box(false, 6f, _stats);
                for (int cell = index; cell < index + 2; cell++)
                {
                    LuneUi.Glyph(rows[cell][0], LuneUiTheme.Muted, 14f, line);
                    Label value = LuneUi.Clip(LuneUi.Label(rows[cell][1], "HudText", line));
                    value.style.flexGrow = 1f;
                    value.style.flexBasis = 0f;
                }
            }
            _types.text = "Rüstung " + LuneStats.ArmorName(def.ArmorType) + " · Angriff " + LuneStats.DamageName(def.AttackType) + ", stark gegen " + LuneStats.StrongAgainst(def.AttackType);
            _ability.text = def.AbilityDescription ?? "";
            bool canAct = planning && !locked;
            string upgrade = def.UpgradeId ?? "";
            if (upgrade.Length == 0)
            {
                _upgradeTitle.text = "Höchste Stufe erreicht.";
                LuneUi.Show(UpgradeButton, false);
                _upgradeDelta.text = "";
            }
            else
            {
                UnitDef next = DataCatalog.GetUnit(upgrade);
                _upgradeTitle.text = "Aufwerten → " + next.DisplayName;
                LuneUi.Show(UpgradeButton, true);
                UpgradeButton.Text = "↑ " + next.Cost;
                UpgradeButton.Disabled = !canAct || gold < next.Cost;
                string delta = "Leben " + LuneUiTheme.Number(def.MaxHp) + " → " + LuneUiTheme.Number(next.MaxHp) + " · Schaden " + LuneUiTheme.Decimal(def.Damage) + " → " + LuneUiTheme.Decimal(next.Damage);
                if (Math.Abs(def.AttackRange - next.AttackRange) > 1e-9)
                    delta += " · Reichweite " + LuneUiTheme.Decimal(def.AttackRange) + " → " + LuneUiTheme.Decimal(next.AttackRange) + " m";
                if (canAct && gold < next.Cost)
                    delta += " · es fehlen " + (next.Cost - gold) + " Gold";
                _upgradeDelta.text = delta;
            }
            LuneUi.Show(_upgradeDelta, _upgradeDelta.text.Length > 0);
            int refund = entry.Fresh ? entry.Invested : (int)Math.Floor(entry.Invested * model.State.Balance.SellRefund);
            SellButton.Text = "Zurückgeben +" + refund;
            SellButton.Disabled = !canAct;
            LuneUi.Show(SellButton, planning);
            _sellNote.text = entry.Fresh ? "voller Preis" : LuneUiTheme.Round(model.State.Balance.SellRefund * 100.0) + " % von " + entry.Invested;
            LuneUi.Show(_sellNote, planning);
            bool grottoOpen = model.State.GrottoAvailable();
            foreach (KeyValuePair<string, LuneButton> pair in LaneButtons)
            {
                pair.Value.On = entry.Lane == pair.Key;
                pair.Value.Disabled = !canAct || (pair.Key == LuneMatch.Grotto && !grottoOpen);
            }
            LuneUi.Show(_warning, entry.Lane == LuneMatch.Grotto);
            if (!planning)
                _locked.text = "Im Kampf gibt es keine Befehle; Aufwertung, Rückgabe und Einsatz wieder in der Planung.";
            else if (locked)
                _locked.text = "Bereit gemeldet: Die Planung ist verbindlich.";
            else if (!grottoOpen)
                _locked.text = "Grotte gesperrt bis Welle " + model.State.Boss.NextAvailableRound + ".";
            else
                _locked.text = "";
            LuneUi.Show(_locked, _locked.text.Length > 0);
        }

        LuneTip StatsTip()
        {
            string type = _portrait.ModelId;
            if (string.IsNullOrEmpty(type))
                return null;
            UnitDef data = DataCatalog.GetUnit(type);
            var tip = new LuneTip { Title = data.DisplayName, Note = "Ein Angriff pro Sekunde mal Tempo; Schaden je Treffer vor Rüstung. Stark: 130 %, schwach: 75 % (Rüstungsmatrix)." };
            tip.Stats.AddRange(LuneStats.Rows(data, true));
            return tip;
        }
    }
}