using UnityEngine;
using TD.Core;

#if UNITY_EDITOR
using UnityEditor;
#endif

namespace TD.Levels
{
    /// <summary>
    /// Authoring volume marking the win-condition target. Enemies that reach a goal volume reduce
    /// the shared player life pool. Goal tiles are <see cref="PlacementState.Restricted"/> in the
    /// baked grid but remain walkable so enemies can enter them.
    /// </summary>
    /// <remarks>
    /// Goals have no ownership — they are shared across all players. Multiple goal volumes are
    /// allowed; the designer specifies the expected count via
    /// <see cref="LevelAuthoring.expectedGoalCount"/> and the bake validates the count matches.
    ///
    /// Final defenders are identified by their player zone being 4-adjacent to a goal volume's
    /// tile coverage; they do not have a LeakExitVolume.
    /// </remarks>
    public class GoalVolume : VolumeBase
    {
        [Tooltip("Whether tiles in this volume are buildable. Defaults to Invalid.")]
        public PlacementValidity placementValidity = PlacementValidity.Invalid;

        // Goals draw above player zones to be visually anchoring landmarks. Higher alpha than
        // other volume types (60% per gizmo design).
        private const float FillYLevel = 0.04f;

        protected override bool GetAlwaysShowToggle(LevelAuthoring authoring)
        {
            return authoring.alwaysShowGoals;
        }

        private void OnDrawGizmosSelected()
        {
            DrawGizmosCore();
        }

        private void OnDrawGizmos()
        {
            if (ShouldDrawAlwaysOn())
            {
                DrawGizmosCore();
            }
        }

        private void DrawGizmosCore()
        {
            Color goalColor = PlayerColors.Goal;
            DrawTileCoverageFill(goalColor, alpha: 0.60f, yLevel: FillYLevel);
            DrawRectangularOutline(goalColor, yLevel: FillYLevel);

#if UNITY_EDITOR
            var col = Collider;
            if (col != null)
            {
                Vector3 labelPos = new Vector3(col.bounds.center.x, FillYLevel + 0.1f, col.bounds.center.z);
                Handles.Label(labelPos, "GOAL");
            }
#endif
        }
    }
}