using System;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using TMPro;

namespace BaseGames.UI
{
    /// <summary>
    /// 滑条控件封装：Slider + 实时数值标签 + 一行式 <see cref="Bind"/>，
    /// 消除设置面板里"移除监听→设值→加监听→更新标签"的重复样板。
    /// </summary>
    [DisallowMultipleComponent]
    public class UISlider : MonoBehaviour
    {
        [SerializeField] private Slider   _slider;
        [Tooltip("实时数值标签（可空）。")]
        [SerializeField] private TMP_Text _valueLabel;
        [Tooltip("数值标签格式（当未传 fmt 委托时使用）。例：\"{0:0}\"、\"{0:0}%\"。")]
        [SerializeField] private string   _format = "{0:0}";

        private Func<float, string> _fmt;

        public Slider Slider => _slider;
        public float Value => _slider != null ? _slider.value : 0f;

        /// <summary>
        /// 绑定取值范围、初值与变更回调。<paramref name="fmt"/> 可自定义数值标签文本（优先于 <see cref="_format"/>）。
        /// </summary>
        public void Bind(float min, float max, float value, UnityAction<float> onChanged, Func<float, string> fmt = null)
        {
            if (_slider == null) return;
            _slider.onValueChanged.RemoveAllListeners();
            _slider.minValue = min;
            _slider.maxValue = max;
            _slider.value    = Mathf.Clamp(value, min, max);
            _fmt = fmt;
            UpdateLabel(_slider.value);
            _slider.onValueChanged.AddListener(v =>
            {
                onChanged?.Invoke(v);
                UpdateLabel(v);
            });
        }

        private void UpdateLabel(float v)
        {
            if (_valueLabel == null) return;
            _valueLabel.text = _fmt != null ? _fmt(v) : string.Format(_format, v);
        }
    }
}