using System;
using System.Collections.Generic;
using DG.Tweening;
using SLSUtilities.UI;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace Cielonos.MainGame.UI
{
    /// <summary>
    /// 通用确认 / 信息提示页面。
    /// <para>
    /// 作为动态 Prefab 实例化，使用完毕后自动销毁。
    /// 通过 <see cref="Show"/> 静态方法创建并显示。
    /// </para>
    /// <para>
    /// 支持任意数量的按钮：
    /// - 两个按钮（确认 / 取消）用于需要用户确认的场景。
    /// - 单个按钮（确定）用于信息提示场景。
    /// </para>
    /// </summary>
    [RequireComponent(typeof(CanvasGroup))]
    public class ConfirmUIPage : UIPageBase
    {
        // ──────────────────── 常量 ────────────────────
        private const float FadeInDuration = 0.2f;
        private const float FadeOutDuration = 0.15f;

        // ──────────────────── 序列化引用 ────────────────────
        [Header("Content")]
        [SerializeField] private TMP_Text titleText;
        [SerializeField] private TMP_Text descriptionText;

        [Header("Buttons")]
        [SerializeField] private Transform buttonContainer;
        [SerializeField] private Button buttonPrefab;

        // ──────────────────── 运行时状态 ────────────────────
        private readonly List<Button> spawnedButtons = new();
        private Action pendingCallback;
        private bool allowEscClose = true;

        /// <inheritdoc/>
        public override bool CloseOnEsc => allowEscClose;

        protected override void Start()
        {
            
        }

        // ──────────────────── 静态入口 ────────────────────

        /// <summary>
        /// 创建并显示一个确认页面实例。
        /// </summary>
        /// <param name="config">页面配置，包含标题、描述和按钮。</param>
        /// <returns>已创建的页面实例。</returns>
        public static ConfirmUIPage Show(ConfirmPageConfig config)
        {
            if (config == null)
                throw new ArgumentNullException(nameof(config));

            var manager = UIPageManager.Instance;
            var go = manager.InstantiateDynamicPage(manager.ConfirmPagePrefab);
            var page = go.GetComponent<ConfirmUIPage>();

            if (page == null)
            {
                Debug.LogError("[ConfirmUIPage] Prefab is missing ConfirmUIPage component.");
                Destroy(go);
                return null;
            }

            page.Initialize(config);
            page.Open();
            return page;
        }

        // ──────────────────── 初始化 ────────────────────

        /// <summary>
        /// 根据配置初始化页面内容和按钮。
        /// </summary>
        private void Initialize(ConfirmPageConfig config)
        {
            allowEscClose = config.AllowEscClose;

            if (titleText != null)
                titleText.text = config.Title;

            if (descriptionText != null)
                descriptionText.text = config.Description;

            CreateButtons(config.Buttons);
        }

        private void CreateButtons(List<ConfirmButtonConfig> buttonConfigs)
        {
            if (buttonPrefab == null)
            {
                Debug.LogError("[ConfirmUIPage] buttonPrefab is not assigned.");
                return;
            }

            // 隐藏模板按钮
            buttonPrefab.gameObject.SetActive(false);

            foreach (var btnConfig in buttonConfigs)
            {
                var button = Instantiate(buttonPrefab, buttonContainer);
                button.gameObject.SetActive(true);

                var label = button.GetComponentInChildren<TMP_Text>();
                if (label != null)
                    label.text = btnConfig.Label;

                var callback = btnConfig.OnClick;
                button.onClick.AddListener(() => OnButtonClicked(callback));

                spawnedButtons.Add(button);
            }
        }

        // ──────────────────── 生命周期 ────────────────────

        public override void Open()
        {
            if (IsOpen) return;
            IsOpen = true;

            gameObject.SetActive(true);
            canvasGroup.alpha = 0f;
            canvasGroup.interactable = false;
            canvasGroup.blocksRaycasts = false;

            UIPageManager.Instance.RegisterPage(this);

            canvasGroup.DOFade(1f, FadeInDuration)
                .SetUpdate(true)
                .OnComplete(() =>
                {
                    canvasGroup.interactable = true;
                    canvasGroup.blocksRaycasts = true;
                    OnPageOpened();
                }).Play();
        }

        public override void Close()
        {
            if (!IsOpen) return;
            IsOpen = false;

            UIPageManager.Instance.UnregisterPage(this);
            canvasGroup.interactable = false;
            canvasGroup.blocksRaycasts = false;

            canvasGroup.DOFade(0f, FadeOutDuration)
                .SetUpdate(true)
                .OnComplete(() =>
                {
                    OnPageClosed();
                    Destroy(gameObject);
                }).Play();
        }

        protected override void OnPageClosed()
        {
            // 先触发基类事件
            base.OnPageClosed();

            // 执行挂起的按钮回调
            var callback = pendingCallback;
            pendingCallback = null;
            callback?.Invoke();

            // 清理按钮监听
            foreach (var btn in spawnedButtons)
            {
                if (btn != null)
                    btn.onClick.RemoveAllListeners();
            }

            spawnedButtons.Clear();
        }

        // ──────────────────── 按钮处理 ────────────────────

        private void OnButtonClicked(Action callback)
        {
            if (!IsOpen) return;
            pendingCallback = callback;
            Close();
        }
    }
}