using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace FloodSWE.Networking
{
    /// <summary>
    /// Drives a Connect/Disconnect button from SweQuestControlClient state.
    /// </summary>
    public sealed class SweConnectionButtonController : MonoBehaviour
    {
        [Header("References")]
        [SerializeField] private SweQuestControlClient controlClient;
        [SerializeField] private Button button;
        [SerializeField] private TMP_Text label;

        [Header("Labels")]
        [SerializeField] private string connectLabel = "Connect";
        [SerializeField] private string loadingLabel = "Loading...";
        [SerializeField] private string disconnectLabel = "Disconnect";

        [Header("Behavior")]
        [SerializeField] private bool disableButtonWhileLoading = true;
        [SerializeField] private bool allowCancelWhileLoading = false;

        private void OnEnable()
        {
            if (button == null)
            {
                button = GetComponent<Button>();
            }

            if (label == null && button != null)
            {
                label = button.GetComponentInChildren<TMP_Text>();
            }

            if (controlClient == null)
            {
                controlClient = FindFirstObjectByType<SweQuestControlClient>();
            }

            if (button != null)
            {
                button.onClick.AddListener(OnButtonPressed);
            }

            RefreshVisual();
        }

        private void OnDisable()
        {
            if (button != null)
            {
                button.onClick.RemoveListener(OnButtonPressed);
            }
        }

        private void Update()
        {
            RefreshVisual();
        }

        public void OnButtonPressed()
        {
            if (controlClient == null)
            {
                return;
            }

            if (controlClient.IsConnectionAlive)
            {
                controlClient.Disconnect();
                return;
            }

            if (controlClient.IsWaitingForAck)
            {
                if (allowCancelWhileLoading)
                {
                    controlClient.Disconnect();
                }
                return;
            }

            controlClient.Connect();
        }

        private void RefreshVisual()
        {
            if (controlClient == null)
            {
                SetLabel(connectLabel);
                SetButtonInteractable(false);
                return;
            }

            if (controlClient.IsConnectionAlive)
            {
                SetLabel(disconnectLabel);
                SetButtonInteractable(true);
                return;
            }

            if (controlClient.IsWaitingForAck)
            {
                SetLabel(loadingLabel);
                bool interactable = !disableButtonWhileLoading || allowCancelWhileLoading;
                SetButtonInteractable(interactable);
                return;
            }

            SetLabel(connectLabel);
            SetButtonInteractable(true);
        }

        private void SetLabel(string textValue)
        {
            if (label == null || label.text == textValue)
            {
                return;
            }

            label.text = textValue;
        }

        private void SetButtonInteractable(bool interactable)
        {
            if (button == null || button.interactable == interactable)
            {
                return;
            }

            button.interactable = interactable;
        }
    }
}