using System.Collections;
using System.Collections.Generic;
using TMPro;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.UI;
using Yarn.Unity;

namespace AibisDream.Test
{
    public class OptionTest : MonoBehaviour
    {
        private GameObject panel;
        private GameObject prefab;
        private GameObject[] buttonGroup;
        private YarnOption[] _options;

        void Start()
        {
            // 初始化时注册Command
            // 第一个参数为[command name=xxx]的参数
            // 第二个参数是注册的函数，在Yarn走到选择项时触发
            DialogController.Instance.RegisterOptionCommand("show_buttons", ShowButtons);

            // 不重要
            panel = transform.GetChild(0).gameObject;
            prefab = Resources.Load<GameObject>("Prefabs/UI/Choice Button");
        }

        /// <summary>
        /// 注册的命令
        /// </summary>
        /// <param name="options">触发时提供的选择项</param>
        public void ShowButtons(YarnOption[] options)
        {
            // 将前两个选项生成清单
            buttonGroup = InstantiateButtons(options);

            _options = options;
        }

        private GameObject[] InstantiateButtons(YarnOption[] options)
        {
            // 这里默认是前两个选项生成按钮，你也可以利用Text或Index来判断哪些是需要生成按钮的选项
            GameObject[] res = new GameObject[2];
            for (int i = 0; i < 2; i++)
            {
                var option = options[i];
                var instance = Instantiate(prefab, panel.transform, true);
                var textMesh = instance.GetComponentInChildren<TextMeshProUGUI>();
                textMesh.text = option.Text;
                
                instance.GetComponent<Button>().onClick.AddListener(() => {
                    // 执行SelectOption(), 对话就会从对应的选项往下继续执行
                    option.SelectOption();
                });

                res[i] = instance;
            }

            return res;
        }

        public void OnDestroy()
        {
            // 注意在合适的时机移除命令
            DialogController.Instance?.RemoveOptionCommand("show_buttons");
        }

        [YarnCommand("change_button_name")]
        public void ChangeButtonName(float idx, string buttonName)
        {
            var realIdx = Mathf.RoundToInt(idx);
            GameObject targetButton = buttonGroup[realIdx];
            
            var textMesh = targetButton.GetComponentInChildren<TextMeshProUGUI>();
            textMesh.text = buttonName;

            var button = targetButton.GetComponentInChildren<Button>();
            button.onClick.RemoveAllListeners();
            button.onClick.AddListener(() =>
            {
                var option = _options[realIdx + 2];
                DialogController.Instance.TryGetVariable($"$visitedState{realIdx + 1}", out bool visitedState);
                if (visitedState)
                {
                    option.SelectOption();
                }
            });
        }
    }
}