using UnityEngine;
using UnityEditor;
using Minigames.BirdPooper;

namespace Editor.CustomEditorsAndDrawers
{
    /// <summary>
    /// Custom editor for Obstacle component.
    /// Provides utility button to auto-setup PolygonCollider2D from object bounds.
    /// </summary>
    [CustomEditor(typeof(Obstacle))]
    public class ObstacleEditor : UnityEditor.Editor
    {
        public override void OnInspectorGUI()
        {
            // Draw default inspector
            DrawDefaultInspector();
            
            EditorGUILayout.Space(10);
            EditorGUILayout.LabelField("Collider Setup", EditorStyles.boldLabel);
            
            Obstacle obstacle = (Obstacle)target;
            
            // Count sprite renderers and colliders in hierarchy
            SpriteRenderer[] allSpriteRenderers = obstacle.GetComponentsInChildren<SpriteRenderer>(true);
            Collider2D[] allColliders = obstacle.GetComponentsInChildren<Collider2D>(true);
            int enabledColliders = 0;
            int disabledColliders = 0;
            foreach (Collider2D col in allColliders)
            {
                if (col.enabled) enabledColliders++;
                else disabledColliders++;
            }
            int renderersWithoutColliders = CountRenderersWithoutColliders(obstacle.transform);
            
            EditorGUILayout.LabelField($"Sprite Renderers: {allSpriteRenderers.Length}", EditorStyles.miniLabel);
            EditorGUILayout.LabelField($"Colliders (enabled): {enabledColliders}", EditorStyles.miniLabel);
            if (disabledColliders > 0)
            {
                EditorGUILayout.LabelField($"Colliders (disabled): {disabledColliders} - will be left alone", EditorStyles.miniLabel);
            }
            if (renderersWithoutColliders > 0)
            {
                EditorGUILayout.LabelField($"Renderers missing colliders: {renderersWithoutColliders}", EditorStyles.miniLabel);
            }
            
            EditorGUILayout.Space(5);
            
            // Button to auto-fit existing colliders
            if (enabledColliders > 0)
            {
                if (GUILayout.Button("Auto Fit All Colliders to Bounds"))
                {
                    AutoFitAllColliders(obstacle);
                }
                
                EditorGUILayout.HelpBox(
                    "Adjusts all ENABLED colliders to match their renderer bounds. Disabled colliders are left alone.",
                    MessageType.Info
                );
                
                EditorGUILayout.Space(5);
            }
            
            // Button to create missing colliders and auto-fit all
            if (GUILayout.Button("Create & Adjust All Colliders"))
            {
                CreateAndAdjustAllColliders(obstacle);
            }
            
            EditorGUILayout.HelpBox(
                "Creates PolygonCollider2D on SpriteRenderers missing colliders, then auto-fits ENABLED colliders to bounds. Disabled colliders are left alone.",
                MessageType.Info
            );
        }
        
        /// <summary>
        /// Count how many SpriteRenderers don't have ANY collider (enabled or disabled) on the same GameObject.
        /// </summary>
        private int CountRenderersWithoutColliders(Transform root)
        {
            int count = 0;
            SpriteRenderer spriteRenderer = root.GetComponent<SpriteRenderer>();
            if (spriteRenderer != null && root.GetComponent<Collider2D>() == null)
            {
                count++;
            }
            
            foreach (Transform child in root)
            {
                count += CountRenderersWithoutColliders(child);
            }
            
            return count;
        }
        
        /// <summary>
        /// Auto-fit all existing colliders recursively.
        /// </summary>
        private void AutoFitAllColliders(Obstacle obstacle)
        {
            int fittedCount = 0;
            AutoFitCollidersRecursive(obstacle.transform, ref fittedCount);
            
            Debug.Log($"[ObstacleEditor] Auto-fitted {fittedCount} collider(s) for '{obstacle.name}'");
            EditorUtility.DisplayDialog(
                "Colliders Adjusted", 
                $"Successfully adjusted {fittedCount} collider(s) to match their renderer bounds.",
                "OK"
            );
        }
        
        /// <summary>
        /// Create missing colliders and auto-fit all colliders recursively.
        /// </summary>
        private void CreateAndAdjustAllColliders(Obstacle obstacle)
        {
            int createdCount = 0;
            int fittedCount = 0;
            
            CreateCollidersRecursive(obstacle.transform, ref createdCount);
            AutoFitCollidersRecursive(obstacle.transform, ref fittedCount);
            
            Debug.Log($"[ObstacleEditor] Created {createdCount} collider(s) and adjusted {fittedCount} collider(s) for '{obstacle.name}'");
            EditorUtility.DisplayDialog(
                "Colliders Created & Adjusted", 
                $"Created {createdCount} new collider(s) and adjusted {fittedCount} total collider(s).",
                "OK"
            );
        }
        
        /// <summary>
        /// Recursively create PolygonCollider2D on GameObjects with Renderer but no Collider2D.
        /// Skips GameObjects that have disabled colliders (leaves them alone).
        /// </summary>
        private void CreateCollidersRecursive(Transform current, ref int createdCount)
        {
            // Check if this GameObject has a SpriteRenderer
            SpriteRenderer spriteRenderer = current.GetComponent<SpriteRenderer>();
            
            if (spriteRenderer != null)
            {
                // Check if there's ANY collider (enabled or disabled)
                Collider2D existingCollider = current.GetComponent<Collider2D>();
                
                // Only create if there's NO collider at all
                if (existingCollider == null)
                {
                    Undo.AddComponent<PolygonCollider2D>(current.gameObject);
                    EditorUtility.SetDirty(current.gameObject);
                    createdCount++;
                }
                // If collider exists but is disabled, leave it alone (skip)
            }
            
            // Recurse to children
            foreach (Transform child in current)
            {
                CreateCollidersRecursive(child, ref createdCount);
            }
        }
        
        /// <summary>
        /// Recursively auto-fit all ENABLED PolygonCollider2D components to their renderer bounds.
        /// Skips disabled colliders (leaves them alone).
        /// </summary>
        private void AutoFitCollidersRecursive(Transform current, ref int fittedCount)
        {
            // Try to fit collider on this GameObject
            PolygonCollider2D polyCollider = current.GetComponent<PolygonCollider2D>();
            Renderer renderer = current.GetComponent<Renderer>();
            
            // Only fit if collider exists, is ENABLED, and has a renderer
            if (polyCollider != null && polyCollider.enabled && renderer != null)
            {
                FitColliderToBounds(current, polyCollider, renderer);
                fittedCount++;
            }
            // If collider is disabled, skip it (leave it alone)
            
            // Recurse to children
            foreach (Transform child in current)
            {
                AutoFitCollidersRecursive(child, ref fittedCount);
            }
        }
        
        /// <summary>
        /// Fit a single PolygonCollider2D to its sprite bounds.
        /// Uses the sprite's local bounds directly to properly handle scale.
        /// </summary>
        private void FitColliderToBounds(Transform targetTransform, PolygonCollider2D polyCollider, Renderer renderer)
        {
            // Try to get SpriteRenderer for direct sprite bounds access
            SpriteRenderer spriteRenderer = renderer as SpriteRenderer;
            
            if (spriteRenderer != null && spriteRenderer.sprite != null)
            {
                // Use sprite's local bounds directly - this is already in local space and respects scale
                Bounds spriteBounds = spriteRenderer.sprite.bounds;
                Vector3 center = spriteBounds.center;
                Vector3 extents = spriteBounds.extents;
                
                // Create rectangle points (already in local space)
                Vector2[] points = new Vector2[4];
                points[0] = new Vector2(center.x - extents.x, center.y - extents.y); // Bottom-left
                points[1] = new Vector2(center.x + extents.x, center.y - extents.y); // Bottom-right
                points[2] = new Vector2(center.x + extents.x, center.y + extents.y); // Top-right
                points[3] = new Vector2(center.x - extents.x, center.y + extents.y); // Top-left
                
                // Apply to collider
                Undo.RecordObject(polyCollider, "Auto Fit Collider");
                polyCollider.SetPath(0, points);
                EditorUtility.SetDirty(polyCollider);
            }
            else
            {
                // Fallback to world space bounds if not a sprite renderer
                Bounds bounds = renderer.bounds;
                Vector3 center = targetTransform.InverseTransformPoint(bounds.center);
                Vector3 extents = bounds.extents;
                
                Vector2[] points = new Vector2[4];
                points[0] = new Vector2(center.x - extents.x, center.y - extents.y);
                points[1] = new Vector2(center.x + extents.x, center.y - extents.y);
                points[2] = new Vector2(center.x + extents.x, center.y + extents.y);
                points[3] = new Vector2(center.x - extents.x, center.y + extents.y);
                
                Undo.RecordObject(polyCollider, "Auto Fit Collider");
                polyCollider.SetPath(0, points);
                EditorUtility.SetDirty(polyCollider);
            }
        }
    }
}