using UnityEngine;

namespace ProjectI.Enemies
{
    // Arrival brackets have their own geometry; faction, charge, health and status visuals retain ownership.
    [DefaultExecutionOrder(220)]
    public sealed class EnemyArrivalPresentation : MonoBehaviour
    {
        private PrototypeEnemy actor;
        private LineRenderer[] lines;
        private static Material shared;
        private ulong observedIdentity;
#if UNITY_EDITOR || DEVELOPMENT_BUILD
        public double FirstVisibleAt { get; private set; } = -1;
        public bool CueVisible => lines != null && lines[0] != null && lines[0].enabled;
#endif
        private void Awake() => actor = GetComponent<PrototypeEnemy>();
        private void LateUpdate()
        {
            var state = actor != null ? actor.Arrival : default;
            if (actor != null && observedIdentity != actor.SpawnIdentity)
            {
                observedIdentity = actor.SpawnIdentity;
#if UNITY_EDITOR || DEVELOPMENT_BUILD
                FirstVisibleAt = -1;
#endif
            }
            bool visible = actor != null && actor.IsAlive && state.Valid && state.SpawnIdentity == actor.SpawnIdentity && actor.ServerNow < state.ReadyAt;
            if (!visible) { Hide(); return; }
            if (lines == null)
            {
                if (shared == null) { shared = new Material(Shader.Find("Universal Render Pipeline/Unlit")); shared.name = "Shared arrival brackets"; shared.SetColor("_BaseColor", new Color(.8f, .95f, 1)); }
                lines = new LineRenderer[4];
                for (int i = 0; i < 4; i++)
                {
                    var child = new GameObject("Arrival bracket " + i); child.layer = 2; child.transform.SetParent(transform, false);
                    var line = child.AddComponent<LineRenderer>(); line.sharedMaterial = shared; line.useWorldSpace = false;
                    line.widthMultiplier = .065f; line.positionCount = 3; line.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off; lines[i] = line;
                }
            }
#if UNITY_EDITOR || DEVELOPMENT_BUILD
            if (FirstVisibleAt < 0) FirstVisibleAt = actor.ServerNow;
#endif
            float progress = Mathf.Clamp01((float)((actor.ServerNow - state.BornAt) / (state.ReadyAt - state.BornAt)));
            float radius = .65f, height = 1.8f;
            if (actor.IsBoss) { radius = .9f; height = 3.3f; }
            else EnemySpawnCircleRules.TryResolveClearance(actor.definition, actor.IsElite, out radius, out height, out _);
            radius += .3f; height = Mathf.Max(.75f, height);
            for (int i = 0; i < 4; i++)
            {
                var axis = Quaternion.Euler(0, 45 + i * 90, 0) * Vector3.forward;
                float bottom = .1f + progress * height * .5f, top = height + .3f - progress * height * .3f;
                lines[i].SetPosition(0, axis * (radius - .18f) + Vector3.up * top);
                lines[i].SetPosition(1, axis * radius + Vector3.up * top);
                lines[i].SetPosition(2, axis * radius + Vector3.up * bottom); lines[i].enabled = true;
            }
        }
        private void Hide() { if (lines != null) foreach (var line in lines) if (line != null) line.enabled = false; }
        private void OnDisable() => Hide();
    }
}