using UnityEngine;
using UnityEngine.InputSystem;

namespace BinxForge.CoinRoom
{
    public sealed class CoinRoom : MonoBehaviour
    {
        public Rigidbody2D player;
        public Pickup[] coins;
        public Patrol patrol;
        public Camera worldCamera;
        public Vector2 spawn = new Vector2(-5, -3);
        public readonly RoundRules Rules = new RoundRules();
        private Vector2 intent;
        public bool Active { get { return isActiveAndEnabled && Application.isFocused && Rules.Active; } }

        private void Start() { RestartRound(); }
        private void Update()
        {
            var keys = Keyboard.current;
            if (!Application.isFocused || keys == null) { intent = Vector2.zero; return; }
            if (keys.rKey.wasPressedThisFrame) RestartRound();
            if (keys.pKey.wasPressedThisFrame) Rules.Pause(!Rules.Paused);
            intent = Active ? new Vector2(
                ((keys.dKey.isPressed || keys.rightArrowKey.isPressed) ? 1 : 0) - ((keys.aKey.isPressed || keys.leftArrowKey.isPressed) ? 1 : 0),
                ((keys.wKey.isPressed || keys.upArrowKey.isPressed) ? 1 : 0) - ((keys.sKey.isPressed || keys.downArrowKey.isPressed) ? 1 : 0)
            ) : Vector2.zero;
        }
        private void FixedUpdate()
        {
            if (player == null) return;
            if (Active) Rules.Tick(Time.fixedDeltaTime);
            RoundRules.Movement(intent.x, intent.y, out double x, out double y);
            player.linearVelocity = Active ? new Vector2((float)x, (float)y) : Vector2.zero;
            player.simulated = Active;
        }
        private void OnApplicationFocus(bool focused)
        {
            if (!focused) { Rules.Pause(true); intent = Vector2.zero; if (player != null) { player.linearVelocity = Vector2.zero; player.simulated = false; } }
        }
        private void OnDisable()
        {
            intent = Vector2.zero;
            if (player != null) { player.linearVelocity = Vector2.zero; player.simulated = false; }
        }
        public void RestartRound()
        {
            intent = Vector2.zero;
            Rules.Restart();
            if (player != null) { player.simulated = false; player.position = spawn; player.linearVelocity = Vector2.zero; player.simulated = Application.isFocused; }
            if (coins != null) foreach (var coin in coins) if (coin != null) coin.gameObject.SetActive(true);
            if (patrol != null) patrol.ResetPose();
        }
        private void OnGUI()
        {
            GUILayout.BeginArea(new Rect(16, 16, Mathf.Max(1, Mathf.Min(390, Screen.width - 32)), 170), GUI.skin.box);
            GUILayout.Label("Coin Room — " + Rules.Score + "/3 coins — " + Mathf.CeilToInt((float)Rules.Remaining) + " active seconds");
            GUILayout.Label("Arrows / WASD: move. P: pause. R: restart.");
            GUILayout.Label("Collect all gold coins; avoid the red patrol.");
            GUILayout.Label(Rules.State != RoundState.Playing ? Rules.State.ToString() : Rules.Paused ? "Paused — press P to resume" : "Playing");
            if (GUILayout.Button("Restart")) RestartRound();
            GUILayout.EndArea();
        }
        private void LateUpdate()
        {
            if (worldCamera != null && worldCamera.aspect > 0) worldCamera.orthographicSize = Mathf.Max(5, 7.75f / worldCamera.aspect);
        }
    }
}