using UnityEngine;

namespace BumpCombat.Constants
{
    [CreateAssetMenu(menuName = "BumpCombat/Defense 2.5D/Artifact Drops")]
    public sealed class Defense25DArtifactDropConstants : ScriptableObject
    {
        [Min(0f)] public float FirstDropDelaySeconds = 60f;
        public float[] LaterDropTimesSeconds = { 180f, 360f };
        public Vector2 NearDistanceRange = new(2f, 4f);
        public Vector2 FarDistanceRange = new(18f, 26f);
        [Min(0f)] public float FarDropSeparation = 12f;
        [Min(0f)] public float InteractionRadius = 1.5f;
        public float[] ReliefSeconds = { 12f, 15f, 15f };
        [Min(0f)] public float DropFootprintRadius = .65f;
        [Min(0f)] public float RouteClearance = .75f;
        [Min(0f)] public float StructureClearance = 1.25f;
        [Min(1)] public int PositionSearchAttempts = 4096;

        public bool Validate(out string error)
        {
            if (!IsFinite(FirstDropDelaySeconds) || FirstDropDelaySeconds < 0f ||
                !IsRangeValid(NearDistanceRange) || !IsRangeValid(FarDistanceRange) ||
                !IsFinite(FarDropSeparation) || FarDropSeparation < 0f ||
                !IsFinite(InteractionRadius) || InteractionRadius <= 0f ||
                !IsFinite(DropFootprintRadius) || DropFootprintRadius <= 0f ||
                !IsFinite(RouteClearance) || RouteClearance < 0f ||
                !IsFinite(StructureClearance) || StructureClearance < 0f ||
                PositionSearchAttempts < 1)
            {
                error = "Artifact drop timing, distance, clearance, or search settings are invalid.";
                return false;
            }

            if (LaterDropTimesSeconds == null || LaterDropTimesSeconds.Length != 2 ||
                !IsFinite(LaterDropTimesSeconds[0]) || !IsFinite(LaterDropTimesSeconds[1]) ||
                LaterDropTimesSeconds[0] <= 0f || LaterDropTimesSeconds[1] <= LaterDropTimesSeconds[0])
            {
                error = "Exactly two increasing later artifact drop times are required.";
                return false;
            }

            if (ReliefSeconds == null || ReliefSeconds.Length != 3)
            {
                error = "Each of the three artifact drops must define one relief duration.";
                return false;
            }
            foreach (float duration in ReliefSeconds)
                if (!IsFinite(duration) || duration <= 0f)
                {
                    error = "Artifact relief durations must be finite and positive.";
                    return false;
                }

            error = string.Empty;
            return true;
        }

        private static bool IsRangeValid(Vector2 range) => IsFinite(range.x) && IsFinite(range.y)
            && range.x >= 0f && range.y > range.x;

        private static bool IsFinite(float value) => !float.IsNaN(value) && !float.IsInfinity(value);
    }
}