using UnityEngine;

namespace BlockOutReplica.Gameplay
{
    public sealed class BlockOutInputController : MonoBehaviour
    {
        private BlockOutGameController game;
        private Camera gameCamera;

        public void Initialize(BlockOutGameController controller, Camera camera)
        { game = controller; gameCamera = camera; }

        private void OnEnable()
        {
            if(game==null)game=GetComponent<BlockOutGameController>();
            if(gameCamera==null)gameCamera=Camera.main;
        }

#if UNITY_EDITOR
        private void OnGUI()
        {
            // Game View can deliver an IMGUI click without a polled Update
            // mouse-down after reload/focus changes. Preserve booster targeting
            // through that native editor event; commit guards prevent double spend.
            var e=Event.current;
            if(game==null||gameCamera==null||game.IsInputReviewRunning||game.InputLocked||
                game.SelectedBooster==BoosterType.None||e.type!=EventType.MouseDown||e.button!=0)return;
            game.BeginDrag(new Vector2(e.mousePosition.x,Screen.height-e.mousePosition.y),gameCamera);
        }
#endif

        private void Update()
        {
            if (game == null || gameCamera == null || game.InputLocked || game.IsInputReviewRunning) return;
            if (TryGetPointerDown(out Vector2 down)) game.BeginDrag(down, gameCamera);
            if (game.IsDragging && TryGetPointerPosition(out Vector2 position))
                game.ContinueDrag(position, gameCamera);
            if (game.IsDragging && IsPointerUp()) game.EndDrag();
        }

        private static bool TryGetPointerDown(out Vector2 position)
        {
            if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)
            { position = Input.GetTouch(0).position; return true; }
            if (Input.GetMouseButtonDown(0))
            { position = Input.mousePosition; return true; }
            position = default; return false;
        }

        private static bool TryGetPointerPosition(out Vector2 position)
        {
            if (Input.touchCount > 0) { position = Input.GetTouch(0).position; return true; }
            position = Input.mousePosition; return true;
        }

        private static bool IsPointerUp()
        {
            if (Input.touchCount > 0)
            {
                TouchPhase phase = Input.GetTouch(0).phase;
                return phase == TouchPhase.Ended || phase == TouchPhase.Canceled;
            }
            return Input.GetMouseButtonUp(0);
        }
    }
}