using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Slice 2 — pure mapping from a chosen class (a <see cref="CharacterId"/> byte) to its spawn-time setup: the
    /// Fire-slot ability id + the permanent trait <see cref="StatModifier"/>s (tagged with the reserved
    /// <see cref="Tuning.ClassSourceId"/>, NEVER stripped). Applied by GoInGameServerSystem on the just-spawned
    /// player and unit-tested. Burst-safe (byte-only, no managed types).
    /// <para>
    /// Trait deltas seed onto the <see cref="CharacterId.Default"/> character (no per-class blob row needed — the
    /// deltas ride the replicated StatModifier buffer, OwnerSendType.All, so the owning client folds the correct
    /// EffectiveCharacterStats). The DRG-asymmetry (operator-locked): <b>Warrior</b> = melee bruiser (tankier,
    /// slower, harder + longer-reach melee via MeleeDamage/MeleeRange); <b>Ranger</b> = ranged anchor (faster,
    /// squishier, longer projectile range + a wider auto-target assist — the co-op synergy hook the Warrior's
    /// knockback feeds). The Warrior's Fire = the aim-directed cone (<see cref="AbilityId.WarriorCone"/>); the
    /// Ranger's Fire = the default projectile (<see cref="AbilityId.Primary"/>).
    /// </para>
    /// </summary>
    public static class ClassTraits
    {
        public const byte WarriorClass = (byte)CharacterId.Warrior;
        public const byte RangerClass = (byte)CharacterId.Ranger;

        /// <summary>Normalize a wire ClassId to a known class (0 / unknown -> Warrior).</summary>
        public static byte Normalize(byte classId) => classId == RangerClass ? RangerClass : WarriorClass;

        /// <summary>The Fire-slot ability id for a class (Warrior = cone, Ranger = the default projectile).</summary>
        public static byte AbilityFor(byte classId)
            => classId == RangerClass ? (byte)AbilityId.Primary : (byte)AbilityId.WarriorCone;

        /// <summary>Append a class's permanent trait modifiers onto a player's StatModifier buffer (via ECB at spawn).</summary>
        public static void AppendSeeds(byte classId, Entity player, EntityCommandBuffer ecb)
        {
            uint src = Tuning.ClassSourceId;
            if (classId == RangerClass)
            {
                ecb.AppendToBuffer(player, new StatModifier { Target = (byte)StatTarget.MoveSpeed, Op = (byte)ModOp.PercentMult, Value = 0.15f, SourceId = src });
                ecb.AppendToBuffer(player, new StatModifier { Target = (byte)StatTarget.MaxHealth, Op = (byte)ModOp.PercentMult, Value = -0.15f, SourceId = src + 1u });
                ecb.AppendToBuffer(player, new StatModifier { Target = (byte)StatTarget.Range, Op = (byte)ModOp.PercentAdd, Value = 0.30f, SourceId = src + 2u });
                ecb.AppendToBuffer(player, new StatModifier { Target = (byte)StatTarget.AutoTargetRange, Op = (byte)ModOp.Flat, Value = 3f, SourceId = src + 3u });
            }
            else
            {
                ecb.AppendToBuffer(player, new StatModifier { Target = (byte)StatTarget.MaxHealth, Op = (byte)ModOp.Flat, Value = 30f, SourceId = src });
                ecb.AppendToBuffer(player, new StatModifier { Target = (byte)StatTarget.MoveSpeed, Op = (byte)ModOp.PercentMult, Value = -0.15f, SourceId = src + 1u });
                ecb.AppendToBuffer(player, new StatModifier { Target = (byte)StatTarget.MeleeDamage, Op = (byte)ModOp.Flat, Value = 6f, SourceId = src + 2u });
                ecb.AppendToBuffer(player, new StatModifier { Target = (byte)StatTarget.MeleeRange, Op = (byte)ModOp.Flat, Value = 0.8f, SourceId = src + 3u });
            }
        }
    }
}