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

/// <summary>
/// 删除用户面板
/// 显示用户列表并提供删除功能，包含二次确认
/// </summary>
public class DeleteUserPanel : BasePanel
{
    [Header("用户列表")]
    public ScrollableListView UserListView; // 滚动用户列表
    public GameObject UserItemPrefab; // 用户列表项预制件
    
    [Header("用户详情显示")]
    public TextMeshProUGUI SelectedUserText; // 选中用户显示
    public TextMeshProUGUI UserDetailsText; // 用户详细信息
                                            // public Image UserAvatarImage; // 用户头像（可选）

    [Header("操作按钮")]
    public Button HomeButton;
    public Button DeleteButton; // 删除按钮
    public Button RefreshButton; // 刷新按钮
    // public Button CancelButton; // 取消按钮
    public Button BackButton; // 返回按钮
    
    [Header("状态显示")]
    public TextMeshProUGUI StatusText; // 状态文本
    
    private IAuthenticationService _authService;
    private UserInfo _selectedUser;
    private List<UserDeleteItem> _userItems = new List<UserDeleteItem>();
    
    public override void Init()
    {
        _authService = ServiceLocator.Get<IAuthenticationService>();
        
        InitializeUI();
        LoadUserList();
    }
    
    private void InitializeUI()
    {
        // 初始化按钮事件
        if (HomeButton != null)
        {
            HomeButton.onClick.AddListener(() =>
            {
                ReturnToHome();
            });
        }
        if (DeleteButton != null)
        {
            DeleteButton.onClick.AddListener(OnDeleteButtonClicked);
            DeleteButton.interactable = false; // 初始禁用
        }
        
        if (RefreshButton != null)
        {
            RefreshButton.onClick.AddListener(OnRefreshButtonClicked);
        }
        
        // if (CancelButton != null)
        // {
        //     CancelButton.onClick.AddListener(OnCancelButtonClicked);
        // }
        
        if (BackButton != null)
        {
            BackButton.onClick.AddListener(OnBackButtonClicked);
        }
        
        // 初始化用户列表
        if (UserListView != null && UserItemPrefab != null)
        {
            UserListView.ItemPrefab = UserItemPrefab;
            UserListView.ItemHeight = 60f;
            UserListView.ItemSpacing = 5f;
        }
        
        SetStatus("请选择要删除的用户", true);
        ClearSelectedUser();
    }
    
    private void LoadUserList()
    {
        if (_authService == null)
        {
            SetStatus("认证服务不可用", false);
            return;
        }
        
        // 清空现有列表
        if (UserListView != null)
        {
            UserListView.ClearItems();
        }
        _userItems.Clear();
        
        // 获取所有用户
        var users = _authService.GetAllUsers();
        if (users == null || users.Count == 0)
        {
            SetStatus("没有可删除的用户", false);
            return;
        }
        
        // 添加用户到列表（排除当前登录用户和admin）
        string currentUser = _authService.CurrentUsername;
        foreach (var user in users)
        {
            // 不允许删除admin用户和当前登录用户
            if (user.Username.Equals("admin", System.StringComparison.OrdinalIgnoreCase) ||
                user.Username.Equals(currentUser, System.StringComparison.OrdinalIgnoreCase))
            {
                continue;
            }
            
            AddUserToList(user);
        }
        
        if (_userItems.Count == 0)
        {
            SetStatus("没有可删除的用户", false);
        }
        else
        {
            SetStatus($"找到 {_userItems.Count} 个可删除的用户", true);
        }
    }
    
    private void AddUserToList(UserInfo user)
    {
        if (UserListView == null) return;
        
        var listItem = UserListView.AddItem(user);
        if (listItem != null)
        {
            var userItem = listItem.gameObject.GetComponent<UserDeleteItem>();
            userItem.Initialize(user, this);
            _userItems.Add(userItem);
        }
    }
    
    public void OnUserSelected(UserInfo user)
    {
        _selectedUser = user;
        UpdateSelectedUserDisplay();
        
        if (DeleteButton != null)
        {
            DeleteButton.interactable = true;
        }
    }
    
    private void UpdateSelectedUserDisplay()
    {
        if (_selectedUser == null)
        {
            ClearSelectedUser();
            return;
        }
        
        if (SelectedUserText != null)
        {
            SelectedUserText.text = $"选中用户: {_selectedUser.Username}";
        }
        
        if (UserDetailsText != null)
        {
            var roleText = _selectedUser.Role == UserRole.Admin ? "管理员" : "普通用户";
            var details = $"用户名: {_selectedUser.Username}\n" +
                         $"角色: {roleText}\n" +
                         $"创建时间: {_selectedUser.CreatedTime:yyyy-MM-dd HH:mm}\n" +
                         $"最后登录: {(_selectedUser.LastLoginTime != default ? _selectedUser.LastLoginTime.ToString("yyyy-MM-dd HH:mm") : "从未登录")}";
            
            UserDetailsText.text = details;
        }
    }
    
    private void ClearSelectedUser()
    {
        _selectedUser = null;
        
        if (SelectedUserText != null)
        {
            SelectedUserText.text = "未选择用户";
        }
        
        if (UserDetailsText != null)
        {
            UserDetailsText.text = "请从下方列表选择要删除的用户";
        }
        
        if (DeleteButton != null)
        {
            DeleteButton.interactable = false;
        }
    }
    
    private void OnDeleteButtonClicked()
    {
        if (_selectedUser == null)
        {
            SetStatus("请先选择要删除的用户", false);
            return;
        }
        string username = _selectedUser.Username;
        // 不能删除admin用户和当前用户
        if (username.Equals("admin", System.StringComparison.OrdinalIgnoreCase))
        {
            SetStatus("不能删除管理员账户", false);
            return;
        }
        
        if (username.Equals(_authService.CurrentUsername, System.StringComparison.OrdinalIgnoreCase))
        {
            SetStatus("不能删除当前登录用户", false);
            return;
        }
        
        // 显示删除确认对话框
        ConfirmDialog.ShowDeleteConfirm(
            _selectedUser.Username,
            () => DeleteUser(_selectedUser.Username),
            () => Debug.Log("取消删除用户")
        );
    }
    
    private void DeleteUser(string username)
    {
        if (_authService == null)
        {
            SetStatus("认证服务不可用", false);
            return;
        }
        
        bool success = _authService.RemoveUser(username);
        
        if (success)
        {
            SetStatus($"用户 '{username}' 删除成功", true);
            Debug.Log($"成功删除用户: {username}");
            
            // 刷新列表
            LoadUserList();
            ClearSelectedUser();
        }
        else
        {
            SetStatus($"删除用户 '{username}' 失败", false);
        }
    }
    
    private void OnRefreshButtonClicked()
    {
        LoadUserList();
        ClearSelectedUser();
    }
    
    private void OnCancelButtonClicked()
    {
        ClosePanel();
    }
    
    private void OnBackButtonClicked()
    {
        ClosePanel();
    }
    
    private void SetStatus(string message, bool isSuccess)
    {
        if (StatusText != null)
        {
            StatusText.text = message;
            StatusText.color = isSuccess ? Color.green : Color.red;
        }
    }
    
    // public void ClosePanel()
    // {
    //     UIManager.Instance.HidePanel<DeleteUserPanel>();
    // }
}