using ProjectM.Simulation;
using Unity.Entities;
using UnityEngine;

namespace ProjectM.Authoring
{
    /// <summary>
    /// Authoring for the projectile ghost prefab fired by the player's primary ability. Bakes the
    /// baked-once tunables (<see cref="Projectile.Speed"/>, <see cref="Projectile.Damage"/>,
    /// <see cref="Projectile.Range"/>) onto the entity; the replicated <c>Direction</c>/<c>SpawnId</c>
    /// and the integrated <c>DistanceTravelled</c> are left at their default 0 and written at spawn
    /// time by AbilityFireSystem. Ghost replication and <c>GhostOwner</c> are supplied by the
    /// GhostAuthoringComponent added on the same prefab GameObject (not added here, nor is Health).
    /// <c>GetEntity(TransformUsageFlags.Dynamic)</c> ensures a runtime-mutable LocalTransform exists.
    /// </summary>
    public class ProjectileAuthoring : MonoBehaviour
    {
        [Min(0f)] public float Speed = 25f;
        [Min(0f)] public float Damage = 20f;
        [Min(0f)] public float Range = 20f;

        private class ProjectileBaker : Baker<ProjectileAuthoring>
        {
            public override void Bake(ProjectileAuthoring authoring)
            {
                var entity = GetEntity(authoring, TransformUsageFlags.Dynamic);

                // Direction / SpawnId / DistanceTravelled default to 0 — set at spawn by AbilityFireSystem.
                AddComponent(entity, new Projectile
                {
                    Speed = authoring.Speed,
                    Damage = authoring.Damage,
                    Range = authoring.Range
                });
            }
        }
    }
}