using System.Numerics;
using Roboto.Core;
using MemEntity = Roboto.Memory.Entity;

namespace Roboto.Data;

/// <summary>
/// Maps raw Memory.Entity → Core.EntitySnapshot. Single source of truth for entity mapping.
/// </summary>
public static class EntityMapper
{
    public static EntitySnapshot MapEntity(MemEntity e, Vector2 playerPos)
    {
        var pos = e.HasPosition ? new Vector2(e.X, e.Y) : Vector2.Zero;
        var dist = e.HasPosition ? Vector2.Distance(pos, playerPos) : float.MaxValue;
        var category = EntityClassifier.Classify(e.Path, e.Components);
        var rarity = (MonsterRarity)e.Rarity;

        return new EntitySnapshot
        {
            Id = e.Id,
            Path = e.Path,
            Metadata = e.Metadata,
            Category = category,
            ThreatLevel = MapThreatLevel(category, rarity),
            Rarity = rarity,
            Position = pos,
            Z = e.Z,
            DistanceToPlayer = dist,
            IsAlive = e.IsAlive || !e.HasVitals,
            LifeCurrent = e.LifeCurrent,
            LifeTotal = e.LifeTotal,
            IsTargetable = e.IsTargetable,
            Components = e.Components,
            ModNames = e.ModNames,
            TransitionName = AreaNameLookup.Resolve(e.TransitionName) ?? e.TransitionName,
            TransitionState = e.TransitionState,
            ActionId = e.ActionId,
            IsAttacking = e.IsAttacking,
            IsMoving = e.IsMoving,
            ItemBaseName = e.ItemBaseName,
            IsQuestItem = e.IsQuestItem,
            LabelOffset = e.LabelOffset,
        };
    }

    public static MonsterThreatLevel MapThreatLevel(EntityCategory category, MonsterRarity rarity)
    {
        if (category != EntityCategory.Monster) return MonsterThreatLevel.None;
        return rarity switch
        {
            MonsterRarity.White => MonsterThreatLevel.Normal,
            MonsterRarity.Magic => MonsterThreatLevel.Magic,
            MonsterRarity.Rare => MonsterThreatLevel.Rare,
            MonsterRarity.Unique => MonsterThreatLevel.Unique,
            _ => MonsterThreatLevel.Normal,
        };
    }
}