using System;
using UnityEngine;
using UnityEngine.UI;

namespace Ashwild.Settings
{
    /// <summary>
    /// A reusable toggle. Pure UI: it knows nothing about which bool setting it drives. The panel
    /// calls <see cref="Init"/> once to register the action to run when the user flips it, then
    /// reflects state through <see cref="SetValue"/>.
    /// </summary>
    [DisallowMultipleComponent]
    public class SettingToggleWidget : MonoBehaviour
    {
        #region Serialized Fields

        [Header("References")]
        [SerializeField] private Toggle toggle;

        #endregion

        #region State

        private Action<bool> onChanged;

        #endregion

        #region Public API

        /// <summary>
        /// Registers the action to run when the user flips the toggle. Call once.
        /// </summary>
        public void Init(Action<bool> onChanged)
        {
            if (toggle == null)
            {
                Debug.LogError($"[SettingToggleWidget] '{name}' has no Toggle assigned.", this);
                return;
            }

            this.onChanged = onChanged;
            toggle.onValueChanged.RemoveListener(HandleToggleChanged);
            toggle.onValueChanged.AddListener(HandleToggleChanged);
        }

        /// <summary>
        /// Displays the given state without invoking the apply action.
        /// </summary>
        public void SetValue(bool value)
        {
            if (toggle != null) toggle.SetIsOnWithoutNotify(value);
        }

        #endregion

        #region Event Handlers

        /// <summary>
        /// Runs the apply action with the user-driven state.
        /// </summary>
        private void HandleToggleChanged(bool value) => onChanged?.Invoke(value);

        #endregion
    }
}