using System;
using System.Collections.Generic;

namespace Luneraria.Core
{
    /// <summary>Timed effect of one family (e.g. "root_grasp"): kind, strength, time left.</summary>
    public sealed class Effect
    {
        /// <summary>movement_slow, attack_slow, attack_speed, damage, reduction, healing_reduction.</summary>
        public string Kind = "";
        public double Amount;
        public double Remaining;
    }

    /// <summary>Damage over time of one family (e.g. "burn"): ticks once per second.</summary>
    public sealed class DamageOverTime
    {
        public double Damage;
        public double Remaining;
        public double NextTick = 1.0;
        public int AttackType;
    }

    /// <summary>
    /// One combat instance (reference: lune_unit.gd). Persistent ownership stays in LuneMatch;
    /// this object lives for one combat phase. Damage, heals and effects are queued and applied
    /// together by LuneCombat, so processing order never decides who strikes first.
    /// </summary>
    public sealed class LuneUnit
    {
        /// <summary>Attack type (row) against armour type (column): Klinge, Durchschlag, Impuls.</summary>
        public static readonly double[,] DamageMatrix = { { 1.30, 0.75, 1.00 }, { 1.00, 1.30, 0.75 }, { 0.75, 1.00, 1.30 } };
        public static readonly string[] MobileKinds = { "troop", "hero", "monster", "champion", "boss" };

        /// <summary>Sequential per combat, assigned in spawn order (deterministic).</summary>
        public int Id;
        /// <summary>Spawn index within the own team; mirrored units share it (fair staggering).</summary>
        public int TeamIndex;
        /// <summary>troop, hero, monster, champion, boss, tower or core.</summary>
        public string Kind = "troop";
        public int Team;
        public int OwnerSlot = -1;
        public string PersistentUid = "";
        public string Lane = "mid";
        /// <summary>lane or grotto.</summary>
        public string Zone = "lane";
        public UnitDef Def = new UnitDef();
        public string BuildingId = "";
        public Vec2 Position;
        public Vec2 PreviousPosition;
        public double Facing;
        public double Hp = 1.0;
        public double MaxHp = 1.0;
        public bool Alive = true;
        public LuneUnit Target;
        public double Progress;
        public double Lateral;
        public double AttackProgress;
        public int HitCount;
        public double CombatTime;
        public double Shield;
        public double ShieldRemaining = double.PositiveInfinity;
        public readonly OrderedMap<string, Effect> Effects = new OrderedMap<string, Effect>();
        public readonly OrderedMap<string, DamageOverTime> Dots = new OrderedMap<string, DamageOverTime>();
        public double AbilityReady = 6.0;
        public bool ReachedBase;
        /// <summary>The grotto boss waits while two expeditions still fight each other.</summary>
        public bool Dormant;
        public double AuraReady = 4.0;
        // H1 hero kit: Sylvara's leap (once per combat) and the ultimate charge (once per combat).
        public bool LeapUsed;
        /// <summary>Set for the one step of a leap: the unit lands next to this target.</summary>
        public LuneUnit LeapTarget;
        /// <summary>The first hit after a leap deals extra damage.</summary>
        public bool LeapStrike;
        public bool UltimateUsed;
        // Presentation-only counters; never read by the rules.
        public int AttackSerial;
        public int AbilitySerial;
        public int LeapSerial;
        public int UltimateSerial;
        public double HitFlash;
        public bool InRange;
        public double DeathTime = -1.0;

        public bool IsBuilding() { return Kind == "tower" || Kind == "core"; }

        public bool IsMobile() { return Array.IndexOf(MobileKinds, Kind) >= 0; }

        public double AttackRange() { return Def.AttackRange; }

        public double Speed() { return Def.Speed; }

        public int ArmorType() { return GdMath.Clamp(Def.ArmorType, 0, 2); }

        public string Ability() { return Def.Ability; }

        public bool IsBoss() { return Kind == "boss" || Def.IsBoss; }

        public double Mitigated(double raw, int attackType)
        {
            double value = GdMath.Max(0.0, raw) * DamageMatrix[GdMath.Clamp(attackType, 0, 2), ArmorType()];
            return value * (1.0 - DamageReduction());
        }

        /// <summary>Applies an already mitigated amount through the shield.</summary>
        public void Take(double amount)
        {
            if (!Alive || amount <= 0.0)
                return;
            double absorbed = GdMath.Min(Shield, amount);
            Shield -= absorbed;
            Hp = GdMath.Max(0.0, Hp - (amount - absorbed));
            HitFlash = 0.18;
        }

        public void Heal(double amount)
        {
            if (Alive && !IsBuilding())
                Hp = GdMath.Min(MaxHp, Hp + GdMath.Max(0.0, amount) * (1.0 - StrongestEffect("healing_reduction")));
        }

        public void GrantShield(double amount, double duration = double.PositiveInfinity)
        {
            if (Alive && amount > Shield)
            {
                Shield = amount;
                ShieldRemaining = duration;
            }
        }

        /// <summary>Buildings ignore crowd control and buffs; an existing family keeps the stronger values.</summary>
        public void ApplyEffect(string family, string kind, double amount, double duration)
        {
            if (!Alive || IsBuilding())
                return;
            Effect effect;
            if (Effects.TryGetValue(family, out effect))
            {
                effect.Amount = GdMath.Max(effect.Amount, amount);
                effect.Remaining = GdMath.Max(effect.Remaining, duration);
            }
            else
            {
                Effects[family] = new Effect { Kind = kind, Amount = amount, Remaining = duration };
            }
        }

        public void ApplyDot(string family, double damage, double duration, int attackType)
        {
            if (!Alive || IsBuilding())
                return;
            DamageOverTime dot;
            if (Dots.TryGetValue(family, out dot))
            {
                if (damage > dot.Damage)
                {
                    dot.Damage = damage;
                    dot.AttackType = attackType;
                }
                dot.Remaining = GdMath.Max(dot.Remaining, duration);
            }
            else
            {
                Dots[family] = new DamageOverTime { Damage = damage, Remaining = duration, NextTick = 1.0, AttackType = attackType };
            }
        }

        public double StrongestEffect(string kind)
        {
            double amount = 0.0;
            IReadOnlyList<Effect> values = Effects.Values;
            for (int i = 0; i < values.Count; i++)
            {
                if (values[i].Kind == kind)
                    amount = GdMath.Max(amount, values[i].Amount);
            }
            return amount;
        }

        public double DamageBonus()
        {
            double result = 0.0;
            IReadOnlyList<Effect> values = Effects.Values;
            for (int i = 0; i < values.Count; i++)
            {
                if (values[i].Kind == "damage")
                    result += values[i].Amount;
            }
            return GdMath.Min(0.30, result) + Def.DamageBonus;
        }

        public double DamageReduction()
        {
            double result = StrongestEffect("reduction");
            switch (Ability())
            {
                case "g03":
                    if (CombatTime < 8.0 - 0.000001)
                        result = GdMath.Max(result, 0.15);
                    break;
                case "g04":
                    result = GdMath.Max(result, CombatTime < 10.0 - 0.000001 ? 0.25 : 0.10);
                    break;
            }
            return GdMath.Min(0.35, result + Def.ReductionBonus);
        }

        public double AttackSpeedFactor()
        {
            double slowing = StrongestEffect("attack_slow") * (IsBoss() ? 0.5 : 1.0);
            double bonus = Def.AttackSpeedBonus;
            return 1.0 + GdMath.Clamp(StrongestEffect("attack_speed") - slowing + bonus, -0.25, 0.5);
        }

        public bool HasTalent(string id) { return Def.Talents.Contains(id); }

        public string Role() { return Def.Role; }

        public double MovementFactor()
        {
            return 1.0 - GdMath.Min(0.35, StrongestEffect("movement_slow") * (IsBoss() ? 0.5 : 1.0));
        }

        /// <summary>Advances effect and shield timers; returns the DoT damage due this step.</summary>
        public double AdvanceStatus(double delta)
        {
            CombatTime += delta;
            HitFlash = GdMath.Max(0.0, HitFlash - delta);
            var families = new List<string>(Effects.Keys);
            foreach (string family in families)
            {
                Effect effect = Effects[family];
                effect.Remaining -= delta;
                if (effect.Remaining <= 0.000001)
                    Effects.Remove(family);
            }
            if (!double.IsPositiveInfinity(ShieldRemaining))
            {
                ShieldRemaining -= delta;
                if (ShieldRemaining <= 0.000001)
                    Shield = 0.0;
            }
            double dotDamage = 0.0;
            var dotFamilies = new List<string>(Dots.Keys);
            foreach (string family in dotFamilies)
            {
                DamageOverTime dot = Dots[family];
                dot.NextTick -= GdMath.Min(delta, GdMath.Max(0.0, dot.Remaining));
                while (dot.NextTick <= 0.000001)
                {
                    dotDamage += Mitigated(dot.Damage, dot.AttackType);
                    dot.NextTick += 1.0;
                }
                dot.Remaining -= delta;
                if (dot.Remaining <= 0.000001)
                    Dots.Remove(family);
            }
            return dotDamage;
        }
    }
}