using System.Collections.Generic;
using UnityEngine;

namespace OnlyScove.Scripts
{
    [RequireComponent(typeof(CharacterController), typeof(InputReader), typeof(Animator))]
    public class PlayerStateMachine : MonoBehaviour
    {
        [field: Header("References")]
        [field: SerializeField] public CharacterController Controller { get; private set; }
        [field: SerializeField] public virtual InputReader Input { get; private set; }
        [field: SerializeField] public Animator Anim { get; private set; }
        [field: SerializeField] public EnvironmentScanner Scanner { get; private set; }
        public CameraController Cam { get; private set; }

        [field: Header("Movement Settings")]
        [field: SerializeField] public float WalkSpeed { get; private set; } = 3f;
        [field: SerializeField] public float RunSpeed { get; private set; } = 6f;
        [field: SerializeField] public float SprintSpeed { get; private set; } = 9f; // 150% of RunSpeed
        [field: SerializeField] public float SneakSpeed { get; private set; } = 1.5f;
        [field: SerializeField] public float DashForce { get; private set; } = 10f;
        [field: SerializeField] public float RotationSpeed { get; private set; } = 500f;
        [field: SerializeField] public float AnimationDamping { get; private set; } = 0.2f;

        [field: Header("Airborne Settings")]
        [field: SerializeField] public float JumpHeight { get; private set; } = 2f;
        [field: SerializeField] public float Gravity { get; private set; } = -9.81f;
        [field: SerializeField] public float ThrustDownwardForce { get; private set; } = -20f;

        [field: Header("Ground Check")]
        [field: SerializeField] public float GroundCheckRadius { get; private set; } = 0.2f;
        [field: SerializeField] public Vector3 GroundCheckOffset { get; private set; }
        [field: SerializeField] public LayerMask GroundMask { get; private set; }

        [field: Header("Interaction")]
        [field: SerializeField] public float InteractionRange { get; private set; } = 2f;
        [field: SerializeField] public LayerMask InteractionMask { get; private set; }

        public float VelocityY { get; set; }
        public bool IsGrounded { get; private set; }
        public bool WasGrounded { get; private set; }

        // Interaction system variables
        private List<IInteractable> interactablesNearby = new List<IInteractable>();
        private int currentInteractableIndex = 0;

        public string CurrentStateName => currentState != null ? currentState.GetType().Name : "None";

        private PlayerBaseState currentState;
        private bool hasControl = true;

        protected virtual void Awake()
        {
            Controller = GetComponent<CharacterController>();
            Input = GetComponent<InputReader>();
            Anim = GetComponentInChildren<Animator>();
            Scanner = GetComponent<EnvironmentScanner>();
            Cam = Camera.main?.GetComponent<CameraController>();
        }

        private void Start()
        {
            SwitchState(new PlayerIdleState(this));
            
            // Subscribe to cycle events
            Input.OnNextInteractEvent += OnNextInteract;
            Input.OnPreviousInteractEvent += OnPreviousInteract;
        }

        private void OnDestroy()
        {
            if (Input != null)
            {
                Input.OnNextInteractEvent -= OnNextInteract;
                Input.OnPreviousInteractEvent -= OnPreviousInteract;
            }
        }

        protected virtual void Update()
        {
            if (!hasControl) return;

            WasGrounded = IsGrounded;
            CheckGround();
            UpdateInteractablesList();

            currentState?.Tick(Time.deltaTime);
        }

        private void FixedUpdate()
        {
            if (!hasControl) return;
            currentState?.PhysicsTick(Time.fixedDeltaTime);
        }

        private void CheckGround()
        {
            IsGrounded = Physics.CheckSphere(transform.TransformPoint(GroundCheckOffset), GroundCheckRadius, GroundMask);
        }

        private void UpdateInteractablesList()
        {
            interactablesNearby.Clear();
            Collider[] colliders = Physics.OverlapSphere(transform.position + transform.forward * (InteractionRange / 2), InteractionRange, InteractionMask);
            foreach (var col in colliders)
            {
                if (col.TryGetComponent(out IInteractable interactable))
                {
                    if (!interactablesNearby.Contains(interactable))
                        interactablesNearby.Add(interactable);
                }
            }

            if (interactablesNearby.Count == 0)
            {
                currentInteractableIndex = 0;
            }
            else if (currentInteractableIndex >= interactablesNearby.Count)
            {
                currentInteractableIndex = interactablesNearby.Count - 1;
            }
        }

        private void OnNextInteract()
        {
            if (interactablesNearby.Count <= 1) return;
            currentInteractableIndex = (currentInteractableIndex + 1) % interactablesNearby.Count;
            Debug.Log($"[Interaction] Switched to: {interactablesNearby[currentInteractableIndex].InteractionPrompt}");
        }

        private void OnPreviousInteract()
        {
            if (interactablesNearby.Count <= 1) return;
            currentInteractableIndex--;
            if (currentInteractableIndex < 0) currentInteractableIndex = interactablesNearby.Count - 1;
            Debug.Log($"[Interaction] Switched to: {interactablesNearby[currentInteractableIndex].InteractionPrompt}");
        }

        public IInteractable GetInteractable()
        {
            if (interactablesNearby.Count == 0) return null;
            return interactablesNearby[currentInteractableIndex];
        }

        public void SetGroundCheck(float radius, Vector3 offset)
        {
            GroundCheckRadius = radius;
            GroundCheckOffset = offset;
        }

        public void SwitchState(PlayerBaseState newState)
        {
            currentState?.Exit();
            currentState = newState;
            currentState?.Enter();
        }

        public void SetControl(bool control)
        {
            hasControl = control;
            Controller.enabled = control;
            if (!control)
            {
                Anim.SetFloat("Speed", 0f);
            }
        }

        private void OnDrawGizmosSelected()
        {
            Gizmos.color = new Color(0, 1, 0, 0.5f);
            Gizmos.DrawSphere(transform.TransformPoint(GroundCheckOffset), GroundCheckRadius);
            
            Gizmos.color = Color.blue;
            Gizmos.DrawWireSphere(transform.position + transform.forward * (InteractionRange / 2), InteractionRange);
        }
    }
}