using System;
using IchniOnline.Online.Logic;
using IchniOnline.Online.Network.Models;
using UnityEngine;
using UnityEngine.UI;

namespace Ichni.UI
{
    public class LoginPage : UIPageBase
    {
        [Header("Button References")]
        public Button closeButton;
        public Button tapTapButton;

        [Header("Page References")]
        public StartUIPage startUIPage;

        private bool _isLoggingIn;

        protected override void Awake()
        {
            base.Awake();

            // 如果 mainCanvasGroup 没有在 Inspector 中赋值，递归查找子物体
            if (mainCanvasGroup == null)
            {
                mainCanvasGroup = GetComponentInChildren<CanvasGroup>(true);
            }
        }

        private void Start()
        {
            // 确保初始状态：alpha=0, 不可交互, 不可射线检测
            // （Canvas 处于 inactive 状态，这些值在激活后生效）
            if (mainCanvasGroup != null)
            {
                mainCanvasGroup.alpha = 0f;
                mainCanvasGroup.interactable = false;
                mainCanvasGroup.blocksRaycasts = false;
            }

            // 在 Start 中绑定按钮事件（确保序列化引用已就绪）
            if (closeButton != null)
            {
                closeButton.onClick.AddListener(OnCloseClicked);
            }
            else
            {
                Debug.LogWarning("[LoginPage] closeButton 未赋值");
            }

            if (tapTapButton != null)
            {
                tapTapButton.onClick.AddListener(OnTapTapClicked);
            }
            else
            {
                Debug.LogWarning("[LoginPage] tapTapButton 未赋值");
            }

            // 在 Start 中订阅 AuthService 事件
            SubscribeAuthEvents();
        }

        private void OnDestroy()
        {
            UnsubscribeAuthEvents();
        }

        private void OnEnable()
        {
            SubscribeAuthEvents();
        }

        private void OnDisable()
        {
            UnsubscribeAuthEvents();
        }

        #region IchniOnlineAuthService Event Subscription

        private void SubscribeAuthEvents()
        {
            IchniOnlineAuthService.OnLoginSuccess -= OnAuthLoginSuccess;
            IchniOnlineAuthService.OnLoginFailed -= OnAuthLoginFailed;
            IchniOnlineAuthService.OnLoginCanceled -= OnAuthLoginCanceled;

            IchniOnlineAuthService.OnLoginSuccess += OnAuthLoginSuccess;
            IchniOnlineAuthService.OnLoginFailed += OnAuthLoginFailed;
            IchniOnlineAuthService.OnLoginCanceled += OnAuthLoginCanceled;
        }

        private void UnsubscribeAuthEvents()
        {
            IchniOnlineAuthService.OnLoginSuccess -= OnAuthLoginSuccess;
            IchniOnlineAuthService.OnLoginFailed -= OnAuthLoginFailed;
            IchniOnlineAuthService.OnLoginCanceled -= OnAuthLoginCanceled;
        }

        #endregion

        /// <summary>
        /// 点击 Close 按钮：淡出登录页，恢复 StartPage 交互
        /// </summary>
        private void OnCloseClicked()
        {
            FadeOut(0.5f, false, RestoreStartPage);
        }

        /// <summary>
        /// 点击 TapTap 按钮：通过 AuthService 发起 TapTap 登录
        /// </summary>
        private void OnTapTapClicked()
        {
            if (_isLoggingIn) return;

            _isLoggingIn = true;
            tapTapButton.interactable = false;
            if (closeButton != null) closeButton.interactable = false;

            Debug.Log("[LoginPage] 正在登录...");
            IchniOnlineAuthService.LoginWithTapTap();
        }

        /// <summary>
        /// AuthService 登录成功回调
        /// </summary>
        private void OnAuthLoginSuccess(LoginResponseDto response)
        {
            _isLoggingIn = false;

            if (response == null || response.User == null)
            {
                Debug.Log("[LoginPage] 登录成功（无用户详情）");
                FadeOut(0.5f, false, RestoreStartPage);
                return;
            }

            Debug.Log($"[LoginPage] 登录成功，用户：{response.User.DisplayName}（ID: {response.User.UserId}）");

            // 登录成功后淡出登录页
            FadeOut(0.5f, false, RestoreStartPage);
        }

        /// <summary>
        /// AuthService 登录失败回调
        /// </summary>
        private void OnAuthLoginFailed(string error)
        {
            _isLoggingIn = false;
            RestoreButtons();
            Debug.LogError($"[LoginPage] 登录失败：{error}");
        }

        /// <summary>
        /// AuthService 登录取消回调
        /// </summary>
        private void OnAuthLoginCanceled()
        {
            _isLoggingIn = false;
            RestoreButtons();
            Debug.Log("[LoginPage] 用户取消了登录");
        }

        private void RestoreButtons()
        {
            if (tapTapButton != null) tapTapButton.interactable = true;
            if (closeButton != null) closeButton.interactable = true;
        }

        /// <summary>
        /// 恢复 StartPage 的交互能力
        /// </summary>
        private void RestoreStartPage()
        {
            if (startUIPage != null)
            {
                startUIPage.RestoreInteraction();
            }
        }
    }
}