using System;
using Unity.Netcode;
using UnityEngine;
using UnityEngine.Events;

public sealed class NetworkButtonInteractable : NetworkInteractable
{
    [SerializeField] private UnityEvent pressed = new();
    [SerializeField] private UnityEvent<bool> buttonStateChanged;

    private readonly NetworkVariable<bool> isPressed = new(
        false,
        NetworkVariableReadPermission.Everyone,
        NetworkVariableWritePermission.Server);
    private readonly NetworkVariable<uint> pressSequence = new(
        0,
        NetworkVariableReadPermission.Everyone,
        NetworkVariableWritePermission.Server);

    public bool IsPressed => isPressed.Value;
    public uint PressSequence => pressSequence.Value;

    public event Action Pressed;
    public event Action<bool> StateChanged;

    public override void OnNetworkSpawn()
    {
        isPressed.OnValueChanged += HandleStateChanged;
        pressSequence.OnValueChanged += HandlePressSequenceChanged;
        ApplyState(isPressed.Value);
    }

    public override void OnNetworkDespawn()
    {
        isPressed.OnValueChanged -= HandleStateChanged;
        pressSequence.OnValueChanged -= HandlePressSequenceChanged;
    }

    protected override bool CanInteractOnServer(ulong senderClientId) => true;

    protected override void InteractOnServer(ulong senderClientId, NetworkObject playerObject)
    {
        isPressed.Value = !isPressed.Value;
        pressSequence.Value++;
    }

    private void HandleStateChanged(bool _, bool currentValue) => ApplyState(currentValue);

    private void HandlePressSequenceChanged(uint previous, uint current)
    {
        if (current == previous)
            return;

        Pressed?.Invoke();
        pressed?.Invoke();
    }

    private void ApplyState(bool currentValue)
    {
        StateChanged?.Invoke(currentValue);
        buttonStateChanged?.Invoke(currentValue);
    }
}