using System;
using System.Collections.Generic;
using System.Linq;
using TMPro;
using UnityEngine;

namespace PhxhSDK
{
    /// <summary>
    /// 文本下拉框
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class UITextDropdown<T> : UIGameObjectWrapper
    {
        /// <summary>
        /// 选中变化回调
        /// </summary>
        private readonly Action<T> onValueChanged;
        /// <summary>
        /// 下拉框
        /// </summary>
        private readonly TMP_Dropdown dropdown;
        private readonly Func<T, string> data2Text;
        private readonly TMP_Text text;
        private int currentSelected;
        private List<T> listData;

        public UITextDropdown(GameObject root,
            GameObject selectTextObject,
            Action<T> onValueChanged,
            Func<T, string> data2Text) : base(root, true)
        {
            dropdown = GetItem<TMP_Dropdown>();
            text = GetItem<TMP_Text>(selectTextObject);

            if (dropdown == null)
                DebugUtil.LogError($"cannot find TMP_Dropdown component in {(root == null ? null : root.name)}");

            if (text == null)
                DebugUtil.LogError($"cannot find TMP_Text component in {(selectTextObject == null ? null : selectTextObject.name)}");

            this.onValueChanged = onValueChanged;
            this.data2Text = data2Text;

            dropdown.onValueChanged.AddListener(OnValueChanged);
        }

        public void SetData(IEnumerable<T> collection)
        {
            listData ??= new(collection.Count());
            listData.Clear();
            listData.AddRange(collection);

            if (dropdown == null)
                return;

            dropdown.ClearOptions();
            foreach (T item in listData)
            {
                TMP_Dropdown.OptionData data = new();
                if (data2Text != null)
                    data.text = data2Text(item);

                dropdown.options.Add(data);
            }

            if (listData != null && currentSelected >= 0 && currentSelected < listData.Count)
            {
                if (data2Text != null && text != null)
                    text.text = data2Text(listData[currentSelected]);
            }
        }

        public void Clear()
        {
            dropdown?.ClearOptions();
        }
        public void SetValue(int value)
        {
            currentSelected = value;
        }

        private void OnValueChanged(int value)
        {
            currentSelected = value;

            if (listData != null && currentSelected >= 0 && currentSelected < listData.Count)
            {
                if (data2Text != null && text != null)
                    text.text = data2Text(listData[currentSelected]);

                onValueChanged?.Invoke(listData[currentSelected]);
            }
        }
    }
}