using System;
using System.Globalization;
using AibisDream.UI;
using AibisDream.Utility;
using TMPro;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Localization.Components;
using UnityEngine.UI;

namespace AibisDream
{
    public class SliderItem : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
    {
        [SerializeField] private Slider slider;
        [SerializeField] private TMP_Text labelText;
        [SerializeField] private LocalizeStringEvent labelLocalize;
        [SerializeField] private TMP_Text sliderText;
        [SerializeField] private Image selectionBar;
        [SerializeField] private float selectionBarHiddenAlpha;
        [SerializeField] private float selectionBarVisibleAlpha = 1f;
        [SerializeField] private Color normalTextColor = Color.white;
        [SerializeField] private Color hoveredTextColor = new Color(0.02f, 0.02f, 0.04f);

        private string _propName;
        private Action<string, string> _onValueChanged;
        private bool _isListening;
        private bool _isHovered;

        private void Awake()
        {
            SetHovered(false);

            if (slider != null && !_isListening)
            {
                slider.onValueChanged.AddListener(OnSliderChanged);
                _isListening = true;
            }
        }

        public void OnPointerEnter(PointerEventData eventData)
        {
            if (!_isHovered)
            {
                _isHovered = true;
                TerminalUIAudio.NotifyHover();
            }

            SetHovered(true);
        }

        public void OnPointerExit(PointerEventData eventData)
        {
            _isHovered = false;
            SetHovered(false);
        }

        private void SetHovered(bool hovered)
        {
            SetSelectionBarAlpha(hovered ? selectionBarVisibleAlpha : selectionBarHiddenAlpha);

            var color = hovered ? hoveredTextColor : normalTextColor;
            SetTextColor(labelText, color);
            SetTextColor(sliderText, color);
        }

        private void SetSelectionBarAlpha(float alpha)
        {
            if (selectionBar == null)
            {
                return;
            }

            var color = selectionBar.color;
            color.a = alpha;
            selectionBar.color = color;
        }

        private static void SetTextColor(TMP_Text text, Color color)
        {
            if (text != null)
            {
                text.color = color;
            }
        }

        private void OnDestroy()
        {
            if (slider != null && _isListening)
            {
                slider.onValueChanged.RemoveListener(OnSliderChanged);
                _isListening = false;
            }
        }

        public void Init(string propName, string label, float minValue, float maxValue, Action<string, string> onValueChanged)
        {
            _propName = propName;
            _onValueChanged = onValueChanged;
            SetDisplayText(labelText, labelLocalize, label);

            if (slider == null)
            {
                Debug.LogError($"[SliderItem] Slider not assigned on {name}.", this);
                return;
            }

            slider.minValue = minValue;
            slider.maxValue = maxValue;
        }

        public void SetValue(string value)
        {
            if (!float.TryParse(value, NumberStyles.Float, CultureInfo.InvariantCulture, out var floatValue))
            {
                Debug.LogError($"SliderItem: 解析数值{value}失败");
                return;
            }

            if (slider != null)
            {
                slider.SetValueWithoutNotify(floatValue);
            }

            RefreshValue(floatValue);
        }

        private void OnSliderChanged(float value)
        {
            RefreshValue(value);
            _onValueChanged?.Invoke(_propName, value.ToString("0.##", CultureInfo.InvariantCulture));
        }

        private void RefreshValue(float value)
        {
            if (sliderText != null)
            {
                var curVolume = Mathf.RoundToInt(value * 100).ToString(CultureInfo.InvariantCulture);
                sliderText.text = $"{curVolume}/100";
            }
        }

        private static void SetDisplayText(TMP_Text text, LocalizeStringEvent localize, string value)
        {
            if (localize != null && IsLocalizationKey(value))
            {
                localize.enabled = true;
                localize.SetTable(ConstRef.UITextTable);
                localize.SetEntry(value);
                return;
            }

            if (localize != null)
            {
                localize.enabled = false;
            }

            if (text != null)
            {
                text.text = value;
            }
        }

        private static bool IsLocalizationKey(string value)
        {
            return !string.IsNullOrEmpty(value) && value.StartsWith("setting_", StringComparison.Ordinal);
        }
    }
}