using Febucci.UI;
using System;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using Yarn.Unity;
using System.Threading.Tasks;

namespace AibisDream
{
    public class DialogUiViewer : Singleton<DialogUiViewer>
    {
        #region 组件名称

        private const string DIALOG_BOX = "Dialog Box";
        private const string ACTOR_NAME = "Actor Name";
        private const string DIALOG_TEXT = "Dialog Text";
        private const string NEXT_BUTTON = "Next Button";
        private const string CHOICE_BUTTON = "Choice Button";
        private const string QUICK_TALK = "Quick Talk";

        #endregion

        #region 对话框UI

        private GameObject dialogBox;
        private TypewriterByCharacter dialogText;
        private TextMeshProUGUI actorName;
        private Button nextButton;
        private GameObject choiceBox;
        private GameObject choiceButtonPrefab;
        private GameObject quickTalkButton;

        #endregion

        protected override void Awake()
        {
            base.Awake();
            // 获取预制体
            choiceButtonPrefab = Resources.Load<GameObject>("Prefabs/UI/Choice Button");
            // 获取子物体
            dialogBox = transform.Find(DIALOG_BOX).gameObject;
            GetDialogComponentInBox(dialogBox);
        }

        private void OnEnable()
        {
            DialogController.OnDialogueComplete += HideDialog;
        }

        private void OnDisable()
        {
            DialogController.OnDialogueComplete -= HideDialog;
        }

        /// <summary>
        /// 显示文字
        /// </summary>
        /// <param name="dialogLine">对话内容</param>
        /// <param name="actor">名称</param>
        /// <param name="nextStep">下一步</param>
        public void ShowLine(string dialogLine, string actor, Action nextStep)
        {
            dialogBox.SetActive(true);
            dialogText.ShowText("");
            dialogText.gameObject.SetActive(true);
            choiceBox.SetActive(false);

            actorName.text = actor;
            dialogText.ShowText(dialogLine);
            
            // 显示完成后处理
            dialogText.onTextShowed.RemoveAllListeners();
            dialogText.onTextShowed.AddListener(() => nextButton.gameObject.SetActive(true));
            
            nextButton.onClick.RemoveAllListeners();
        }
        
        /// <summary>
        /// 显示文字，显示完成自动跳过
        /// </summary>
        /// <param name="dialogLine"></param>
        /// <param name="actor"></param>
        /// <param name="nextStep"></param>
        public void ShowAutoLine(string dialogLine, string actor, Action nextStep)
        {
            dialogBox.SetActive(true);
            dialogText.ShowText("");
            dialogText.gameObject.SetActive(true);
            choiceBox.SetActive(false);
            
            actorName.text = actor;
            nextButton.onClick.RemoveAllListeners();
            dialogText.ShowText(dialogLine);
            
            // 对话显示完成后自动跳过
            dialogText.onTextShowed.RemoveAllListeners();
            dialogText.onTextShowed.AddListener(() => CommonUtil.Delay(200, nextStep));
        }

        /// <summary>
        /// 显示选项
        /// </summary>
        /// <param name="dialogueOptions">选项</param>
        /// <param name="onOptionSelected"></param>
        public void ShowOptions(DialogueOption[] dialogueOptions, Action<int> onOptionSelected)
        {
            dialogBox.SetActive(true);
            choiceBox.SetActive(true);
            dialogText.gameObject.SetActive(false);
            dialogText.ShowText("");
            actorName.text = "";

            // 销毁原来的按钮
            foreach (Transform child in choiceBox.transform)
            {
                Destroy(child.gameObject);
            }

            // 生成新按钮
            foreach (DialogueOption option in dialogueOptions)
            {
                if (option.IsAvailable)
                {
                    var choiceInstance = Instantiate(choiceButtonPrefab, Vector3.zero, Quaternion.identity);
                    choiceInstance.transform.SetParent(choiceBox.transform);
                    choiceInstance.GetComponentInChildren<TextMeshProUGUI>().text =
                        option.Line.TextWithoutCharacterName.Text;
                    choiceInstance.GetComponent<Button>().onClick
                        .AddListener(() => onOptionSelected.Invoke(option.DialogueOptionID));
                }
            }
        }

        public void HideDialog()
        {
            dialogBox?.SetActive(false);
        }

        public void SwitchQuickTalkMode()
        {
            DialogController.Instance.quickRunMode = !DialogController.Instance.quickRunMode;
            quickTalkButton.GetComponent<Image>().color =
                DialogController.Instance.quickRunMode ? Color.gray : Color.white;
        }

        public bool TrySkipLine()
        {
            if (dialogText.isShowingText)
            {
                dialogText.SkipTypewriter();
                return true;
            }
            else
            {
                return false;
            }
        }

        public void AfterEndLine()
        {
            nextButton.gameObject.SetActive(false);
        }

        private void GetDialogComponentInBox(GameObject box)
        {
            actorName = box.transform.Find(ACTOR_NAME).gameObject.GetComponent<TextMeshProUGUI>();
            dialogText = box.transform.Find(DIALOG_TEXT).gameObject.GetComponent<TypewriterByCharacter>();
            nextButton = box.transform.Find(NEXT_BUTTON).GetComponent<Button>();
            choiceBox = box.transform.Find(CHOICE_BUTTON).gameObject;
            quickTalkButton = box.transform.Find(QUICK_TALK).gameObject;
            
            quickTalkButton.GetComponent<Button>().onClick.AddListener(SwitchQuickTalkMode);
        }
    }
}