using System.Collections.Generic;
using System.Globalization;
using System.Text;
using Luneraria.Core;

namespace Luneraria.UI
{
    /// <summary>Network state the HUD shows (role, connection); implemented by the session in U4.</summary>
    public interface ILuneHudSession
    {
        bool IsNetworked { get; }
        bool IsAuthority { get; }
    }

    /// <summary>
    /// What one seat may see, prepared for display (port of scripts/luneraria/ui/lune_hud_model.gd).
    /// Every HUD element reads through this model, so the privacy rules live in one place:
    /// - gold, draft, undo and uncommitted bookings exist only for the viewer's own seat;
    /// - of other players the model exposes names, lanes, readiness, human/bot/offline and the
    ///   committed hero (public since the last combat), never their gold or current plans;
    /// - lanes, buildings, the boss and the waves come from public state only.
    /// The model never changes the match; commands still go through the game controller.
    /// </summary>
    public sealed class LuneHudModel
    {
        public static readonly Dictionary<string, string> TowerNames = new Dictionary<string, string>
            { { "outer", "Grenzwacht" }, { "inner", "Bastion" }, { "base", "Kernwacht" }, { "core", "Ancient" } };
        public static readonly Dictionary<string, string> TierText = new Dictionary<string, string>
            { { "outer", "Außenturm" }, { "inner", "Innenturm" }, { "base", "Basisturm" }, { "core", "Ancient" } };

        public readonly LuneMatch State;
        public readonly int Slot;
        /// <summary>Optional network session; only read for the display (role, connection).</summary>
        public ILuneHudSession Session;
        readonly HashSet<int> _wasHuman = new HashSet<int>();

        public LuneHudModel(LuneMatch state, int viewer, ILuneHudSession session = null)
        {
            State = state;
            Slot = System.Math.Max(0, viewer);
            Session = session;
        }

        // ---------------------------------------------------------------- phase and own seat
        public bool Planning { get { return State.Phase == Phase.Planning; } }
        public bool Fighting { get { return State.Phase == Phase.Combat && State.Combat != null; } }
        public bool Over { get { return State.Phase == Phase.Over; } }
        public Player Me { get { return State.Players[Slot]; } }
        public int Team { get { return Me.Team; } }
        public int Enemy { get { return 1 - Team; } }
        public int OwnGold { get { return State.GoldOf(Slot); } }
        /// <summary>Base income paid at the end of the current round's combat (rules: LuneBalance.RoundIncome).</summary>
        public int Income { get { return State.Balance.RoundIncome(State.RoundNumber) + IncomeBonus; } }
        /// <summary>S1: the own permanent champion income (Legion TD 2), 0 under the reference rules.</summary>
        public int IncomeBonus { get { return State.Extended ? Me.IncomeBonus : 0; } }
        /// <summary>After Ready the plan is binding (the host refuses later commands).</summary>
        public bool Locked { get { return Planning && Me.Ready; } }
        public List<RosterEntry> OwnRoster { get { return Planning ? Me.Draft.Roster : Me.Roster; } }
        /// <summary>The own hero: the draft in planning, the committed hero otherwise; null without a hero.</summary>
        public HeroState OwnHero { get { return Planning ? Me.Draft.Hero : Me.Hero; } }
        public bool CanUndo { get { return Planning && !Locked && Me.Undo.Count > 0; } }
        public int SupplyCap { get { return State.Balance.SupplyCap; } }
        public bool Networked { get { return Session != null && Session.IsNetworked; } }
        public bool IsGuest { get { return Networked && !Session.IsAuthority; } }

        public sealed class BookingView
        {
            public string Uid = "";
            public string ChampionId = "";
            public string Lane = "";
            public int DeployRound;
            public int Cost;
            /// <summary>Booked in this planning (still refundable).</summary>
            public bool Fresh;

            public override string ToString() { return Uid + ":" + ChampionId + ":" + Lane + ":" + DeployRound + ":" + Fresh; }
        }

        public List<BookingView> OwnBookings()
        {
            var result = new List<BookingView>();
            if (Planning)
            {
                foreach (Booking booking in Me.Draft.NewBookings)
                    result.Add(new BookingView { Uid = booking.Uid, ChampionId = booking.ChampionId, Lane = booking.Lane, Cost = booking.Cost, DeployRound = State.RoundNumber + 1, Fresh = true });
            }
            foreach (Booking booking in Me.Bookings)
            {
                if (booking.DeployRound >= State.RoundNumber)
                    result.Add(new BookingView { Uid = booking.Uid, ChampionId = booking.ChampionId, Lane = booking.Lane, Cost = booking.Cost, DeployRound = booking.DeployRound });
            }
            return result;
        }

        // ---------------------------------------------------------------- units and heroes
        public string RoleOf(string typeId) { return State.RoleOf(typeId); }

        public sealed class TroopInfo
        {
            public UnitDef Def;
            public string Role = "";
            public int Stage;
        }

        /// <summary>Catalogue definition of a troop with its role and stage.</summary>
        public TroopInfo Troop(string typeId)
        {
            return new TroopInfo { Def = DataCatalog.GetUnit(typeId), Role = RoleOf(typeId), Stage = LuneStats.StageOf(typeId) };
        }

        /// <summary>Live combat unit for a persistent uid of the viewer (or null).</summary>
        public LuneUnit LiveUnit(string uid)
        {
            if (!Fighting || string.IsNullOrEmpty(uid))
                return null;
            foreach (LuneUnit unit in State.Combat.Units)
            {
                if (unit.PersistentUid == uid)
                    return unit;
            }
            return null;
        }

        public UnitDef HeroDefinition(HeroState hero)
        {
            UnitDef definition = LuneContent.HeroDefinition(hero);
            definition.Role = ContentData.HeroRoles.GetValueOrDefault(hero.HeroId, "front");
            return definition;
        }

        // ---------------------------------------------------------------- buildings
        public sealed class BuildingInfo
        {
            public string Id = "";
            public int Team;
            public string Tier = "outer";
            public string Lane = "";
            public bool Alive;
            public double Hp;
            public double MaxHp = 1.0;
            public double Fraction;
            public bool Attackable;
            public BuildingInfo[] Base;

            public override string ToString()
            {
                return Id + ":" + Alive + ":" + LuneUiTheme.Round(Hp) + ":" + Attackable;
            }
        }

        public BuildingInfo Building(string id)
        {
            BuildingDef definition = State.Map.BuildingDef(id);
            double maxHp = definition != null ? definition.MaxHp : 1.0;
            double hp = State.BuildingHp.GetValueOrDefault(id, 0.0);
            bool alive = hp > 0.0;
            if (Fighting && State.Combat.Buildings.TryGetValue(id, out LuneUnit unit))
            {
                alive = unit.Alive;
                hp = alive ? unit.Hp : 0.0;
            }
            return new BuildingInfo
            {
                Id = id, Team = definition != null ? definition.Team : 0, Tier = definition != null ? definition.Tier : "outer", Lane = definition != null ? definition.Lane : "",
                Alive = alive, Hp = hp, MaxHp = maxHp, Fraction = GdMath.Clamp(hp / GdMath.Max(1.0, maxHp), 0.0, 1.0),
                Attackable = alive && definition != null && LuneMap.IsAttackable(definition, AliveMap()),
            };
        }

        Dictionary<string, bool> AliveMap()
        {
            if (Fighting)
                return State.Combat.AliveMap();
            var result = new Dictionary<string, bool>();
            foreach (KeyValuePair<string, double> pair in State.BuildingHp)
                result[pair.Key] = pair.Value > 0.0;
            return result;
        }

        public static string BuildingTitle(string id)
        {
            string[] parts = id.Split('_');
            if (parts[1] == "ancient")
                return "Ancient";
            if (parts[1] == "base")
                return "Kernwacht";
            return TowerNames.TryGetValue(parts[2], out string name) ? name : id;
        }

        public static string BuildingPlace(string id)
        {
            string[] parts = id.Split('_');
            string team = parts[0] == "blau" ? "Blau" : "Rot";
            if (parts[1] == "ancient")
                return "Ancient " + team;
            if (parts[1] == "base")
                return string.Format("Basis {0} · Kernwacht {1}", team, parts[2]);
            return string.Format("{0} · {1} {2}", LuneMap.LaneNames[parts[1]].ToUpperInvariant(), BuildingTitle(id), team);
        }

        /// <summary>A team's Ancient with its two base towers (Kernwacht) in Base.</summary>
        public BuildingInfo Ancient(int team)
        {
            string prefix = team == 0 ? "blau" : "rot";
            BuildingInfo core = Building(prefix + "_ancient");
            core.Base = new[] { Building(prefix + "_base_1"), Building(prefix + "_base_2") };
            return core;
        }

        // ---------------------------------------------------------------- players
        public string PlayerName(int seat)
        {
            return seat == Slot ? "Du" : State.Players[seat].Name;
        }

        /// <summary>Seat status for display: self, human, bot, or offline (was human, a bot plays the seat).</summary>
        public string StatusOf(int seat)
        {
            Player player = State.Players[seat];
            if (player.IsHuman)
                _wasHuman.Add(seat);
            if (seat == Slot)
                return "self";
            if (player.IsHuman)
                return "human";
            return _wasHuman.Contains(seat) ? "offline" : "bot";
        }

        public sealed class MemberInfo
        {
            public int Slot;
            public string Name = "";
            public string Lane = "";
            public bool IsSelf;
            public bool Ready;
            public string Status = "";
            public string Bund = "";
            public string HeroId = "";
            public int HeroLevel;

            public override string ToString()
            {
                return Slot + ":" + Name + ":" + Lane + ":" + IsSelf + ":" + Ready + ":" + Status + ":" + Bund + ":" + HeroId + ":" + HeroLevel;
            }
        }

        public List<MemberInfo> Members(int team)
        {
            var result = new List<MemberInfo>();
            for (int seat = team * 3; seat < team * 3 + 3; seat++)
            {
                Player player = State.Players[seat];
                // Own seat: current draft. Everyone else: the committed hero, public since the last combat.
                HeroState hero = seat == Slot ? OwnHero : player.Hero;
                result.Add(new MemberInfo
                {
                    Slot = seat, Name = PlayerName(seat), Lane = player.Lane, IsSelf = seat == Slot, Ready = player.Ready, Status = StatusOf(seat), Bund = player.Bund,
                    HeroId = hero != null ? hero.HeroId : "", HeroLevel = hero != null ? LuneContent.LevelFor(hero.Xp) : 0,
                });
            }
            return result;
        }

        /// <summary>Ready humans and humans in the match.</summary>
        public void ReadyCount(out int ready, out int humans)
        {
            ready = 0;
            humans = 0;
            foreach (Player player in State.Players)
            {
                if (!player.IsHuman)
                    continue;
                humans++;
                if (player.Ready)
                    ready++;
            }
        }

        // ---------------------------------------------------------------- lanes
        public sealed class HeroBrief
        {
            public string Model = "";
            public string Name = "";
            public int Level;

            public override string ToString() { return Model + ":" + Level; }
        }

        public sealed class LaneInfo
        {
            public string Lane = "";
            public string Title = "";
            public string OwnPlayer = "";
            public string EnemyPlayer = "";
            public bool OwnIsMe;
            /// <summary>Own inner, own outer, enemy outer, enemy inner: the chain from the own base to the enemy's.</summary>
            public BuildingInfo[] Towers;
            public LuneLaneThreat.Result Threat;
            public readonly List<Announcement> Dangers = new List<Announcement>();
            public HeroBrief OwnHero;
            public HeroBrief EnemyHero;
            /// <summary>Unit counts exist only in combat.</summary>
            public bool HasCounts;
            public int OwnCount;
            public int EnemyCount;
            /// <summary>S1 barracks: own waves reinforced here (enemy inner tower fell) / enemy waves reinforced.</summary>
            public bool OwnBarracks;
            public bool EnemyBarracks;
        }

        public LaneInfo Lane(string lane)
        {
            int ownSeat = State.SlotOf(Team, lane);
            int enemySeat = State.SlotOf(Enemy, lane);
            string own = Team == 0 ? "blau" : "rot";
            string enemy = Team == 0 ? "rot" : "blau";
            var result = new LaneInfo
            {
                Lane = lane, Title = LuneMap.LaneNames[lane].ToUpperInvariant(), OwnPlayer = PlayerName(ownSeat), EnemyPlayer = PlayerName(enemySeat), OwnIsMe = ownSeat == Slot,
                Towers = new[] { Building(own + "_" + lane + "_inner"), Building(own + "_" + lane + "_outer"), Building(enemy + "_" + lane + "_outer"), Building(enemy + "_" + lane + "_inner") },
                Threat = LuneLaneThreat.Evaluate(State, Team, lane), OwnHero = HeroOf(ownSeat), EnemyHero = HeroOf(enemySeat),
                OwnBarracks = State.Extended && State.BarracksBroken(Team, lane), EnemyBarracks = State.Extended && State.BarracksBroken(Enemy, lane),
            };
            foreach (Announcement entry in State.Announcements())
            {
                if (entry.Lane == lane)
                    result.Dangers.Add(entry);
            }
            if (Fighting)
            {
                LuneLaneThreat.Battle battle = LuneLaneThreat.Battlefield(State, Team, lane);
                result.HasCounts = true;
                result.OwnCount = battle.OwnCount;
                result.EnemyCount = battle.EnemyCount;
            }
            return result;
        }

        /// <summary>A seat's hero for display: the own draft for the viewer, the committed (public) hero for everyone else; null without a hero.</summary>
        public HeroBrief HeroOf(int seat)
        {
            HeroState hero = seat == Slot ? OwnHero : State.Players[seat].Hero;
            if (hero == null)
                return null;
            HeroSpec spec = LuneContent.Heroes[hero.HeroId];
            return new HeroBrief { Model = spec.Model, Name = spec.Name, Level = LuneContent.LevelFor(hero.Xp) };
        }

        // ---------------------------------------------------------------- boss grotto
        public sealed class BossInfo
        {
            /// <summary>available, contested, conquered, failed, deploy_next, deploying, defeated or cooldown.</summary>
            public string State = "cooldown";
            public int Team = -1;
            public string Lane = "";
            public int DeployRound;
            public int WonRound;
            public int Bounty;
            public int RoundsLeft;
            public bool Own;
            public bool Chooser;
            public int NextRound;
            public bool HasHp;
            public double Hp;
            public double MaxHp = 1.0;

            /// <summary>The public part (without the viewer's own/chooser flags).</summary>
            public string PublicText()
            {
                return string.Format(CultureInfo.InvariantCulture, "{0}:{1}:{2}:{3}:{4}:{5}:{6}:{7}:{8}", State, Team, Lane, DeployRound, WonRound, Bounty, RoundsLeft, NextRound,
                    HasHp ? LuneUiTheme.Round(Hp) + "/" + LuneUiTheme.Round(MaxHp) : "-");
            }

            public override string ToString() { return PublicText() + ":" + Own + ":" + Chooser; }
        }

        /// <summary>
        /// Public boss state: available, contested, conquered, failed, deploy_next, deploying,
        /// defeated, cooldown. On a guest the grotto fight is read from the mirrored units. The
        /// chooser sees the lane of the own draft; everyone else the public claim lane.
        /// </summary>
        public BossInfo Boss()
        {
            return Boss(false);
        }

        BossInfo Boss(bool publicOnly)
        {
            BossClaim claim = State.Boss.Claim;
            int round = State.RoundNumber;
            var result = new BossInfo { RoundsLeft = System.Math.Max(0, State.Boss.NextAvailableRound - round), NextRound = State.Boss.NextAvailableRound };
            if (Fighting)
            {
                foreach (LuneUnit unit in State.Combat.Units)
                {
                    if (unit.Kind != "boss")
                        continue;
                    if (unit.Zone == "grotto")
                    {
                        if (unit.Alive)
                        {
                            result.State = "contested";
                            return result;
                        }
                        int winner = -1;
                        foreach (LuneUnit other in State.Combat.Units)
                        {
                            if (other.Alive && other.Zone == "grotto" && other.Team <= 1)
                                winner = other.Team;
                        }
                        result.State = winner >= 0 ? "conquered" : "failed";
                        result.Team = winner;
                        result.Own = winner == Team;
                        result.DeployRound = round + 1;
                        return result;
                    }
                    if (unit.Zone == "lane")
                    {
                        result.State = unit.Alive ? "deploying" : "defeated";
                        result.Team = unit.Team;
                        result.Own = unit.Team == Team;
                        result.Lane = unit.Lane;
                        result.DeployRound = round;
                        result.Bounty = LuneContent.BossBountyFor(round);
                        result.HasHp = true;
                        result.Hp = unit.Hp;
                        result.MaxHp = unit.MaxHp;
                        return result;
                    }
                }
            }
            if (claim != null && claim.DeployRound >= round)
            {
                result.State = Planning ? "deploy_next" : "deploying";
                result.Team = claim.Team;
                result.Own = claim.Team == Team;
                result.WonRound = claim.WonRound;
                result.DeployRound = claim.DeployRound;
                result.Bounty = LuneContent.BossBountyFor(claim.DeployRound);
                result.Chooser = claim.ChooserSlot == Slot;
                // The chooser's lane change is private until combat; others see the public claim lane.
                string chosen = !publicOnly && result.Chooser && Planning ? Me.Draft.BossLane ?? "" : "";
                result.Lane = chosen.Length > 0 ? chosen : claim.Lane;
                return result;
            }
            if (State.GrottoAvailable())
                result.State = "available";
            return result;
        }

        // ---------------------------------------------------------------- waves
        public sealed class MonsterGroup
        {
            public string Id = "";
            public string Name = "";
            public int Count;
            public double Hp;
            public double Damage;
            public double Range;
            public bool New;
            public int Armor;
            public int Attack;

            public override string ToString() { return Id + "x" + Count + (New ? "+" : ""); }
        }

        public sealed class ChampionNotice
        {
            public int Team;
            public string Lane = "";
            public string ChampionId = "";
            public string Name = "";
            public bool Own;

            public override string ToString() { return Team + ":" + Lane + ":" + ChampionId; }
        }

        public sealed class BossNotice
        {
            public int Team;
            public string Lane = "";
            public int Bounty;
            public bool Own;

            public override string ToString() { return Team + ":" + Lane + ":" + Bounty; }
        }

        public sealed class WaveInfo
        {
            public int Round;
            public readonly List<MonsterGroup> Monsters = new List<MonsterGroup>();
            public int Count;
            public readonly List<ChampionNotice> Champions = new List<ChampionNotice>();
            public BossNotice Boss;

            public override string ToString()
            {
                return Round + "|" + string.Join(",", Monsters) + "|" + Count + "|" + string.Join(",", Champions) + "|" + (Boss != null ? Boss.ToString() : "-");
            }
        }

        /// <summary>
        /// The wave of the coming combat (planning) or the one after (combat). Monsters are public
        /// and identical for both sides; champions and the boss only once they are announced.
        /// </summary>
        public WaveInfo NextWave()
        {
            int round = Fighting ? State.RoundNumber + 1 : State.RoundNumber;
            List<UnitDef> wave = LuneWaves.Build(State.Balance, round);
            List<string> before = round > 1 ? LuneWaves.UnlockedTypes(State.Balance, round - 1) : new List<string>();
            var result = new WaveInfo { Round = round, Count = wave.Count };
            var groups = new Dictionary<string, MonsterGroup>();
            foreach (UnitDef monster in wave)
            {
                if (!groups.TryGetValue(monster.Id, out MonsterGroup group))
                {
                    group = new MonsterGroup
                    {
                        Id = monster.Id, Name = monster.DisplayName, Hp = monster.MaxHp, Damage = monster.Damage, Range = monster.AttackRange,
                        New = round > 1 && !before.Contains(monster.Id), Armor = monster.ArmorType, Attack = monster.AttackType,
                    };
                    groups[monster.Id] = group;
                    result.Monsters.Add(group);
                }
                group.Count++;
            }
            if (!Fighting)
            {
                foreach (Announcement entry in State.Announcements())
                {
                    if (entry.Kind == "boss")
                        result.Boss = new BossNotice { Team = entry.Team, Lane = entry.Lane, Bounty = entry.Bounty, Own = entry.Team == Team };
                    else
                        result.Champions.Add(new ChampionNotice { Team = entry.Team, Lane = entry.Lane, ChampionId = entry.ChampionId, Name = LuneContent.Champions[entry.ChampionId].Name, Own = entry.Team == Team });
                }
            }
            return result;
        }

        // ---------------------------------------------------------------- network test support
        /// <summary>
        /// Everything the HUD shows that must be identical for every seat (host, guest, bot views),
        /// as one string. The boss uses the public claim lane: the chooser's draft lane is private.
        /// </summary>
        public string PublicDigest()
        {
            var text = new StringBuilder();
            text.Append("round ").Append(State.RoundNumber).Append(" phase ").Append(State.Phase).Append('\n');
            foreach (BuildingDef definition in State.Map.Buildings)
            {
                BuildingInfo entry = Building(definition.Id);
                text.Append(definition.Id).Append('=').Append(entry.Alive).Append('/').Append(LuneUiTheme.Round(entry.Hp)).Append(' ');
            }
            text.Append('\n');
            foreach (string name in LuneMap.Lanes)
            {
                for (int side = 0; side < 2; side++)
                {
                    LuneLaneThreat.Result threat = LuneLaneThreat.Evaluate(State, side, name);
                    text.Append(name).Append('/').Append(side).Append('=').Append(threat.Level).Append(' ').Append(string.Join(";", threat.Reasons)).Append('\n');
                }
            }
            foreach (Player player in State.Players)
            {
                text.Append(player.Slot).Append(':').Append(player.Lane).Append(':').Append(player.Ready).Append(':').Append(player.IsHuman).Append(':')
                    .Append(player.Hero != null ? player.Hero.HeroId + "@" + player.Hero.Xp : "-").Append(' ');
            }
            text.Append('\n').Append("boss ").Append(Boss(true).PublicText()).Append('\n');
            text.Append("wave ").Append(NextWave()).Append('\n');
            return text.ToString();
        }
    }
}