using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;

namespace SHH.CameraDashboard
{
    // 简单的包装类，用于 ComboBox 显示
    public class ServerOption
    {
        public string Name { get; set; }

        public string Ip { get; set; }
        public int Port { get; set; }
        // 修改显示属性：如果有名字就显示 名字(IP)，没有就显示 IP
        public string DisplayText => string.IsNullOrEmpty(Name) ? $"{Ip}:{Port}" : $"{Name} ({Ip})";
    }

    public partial class CameraListControl : UserControl
    {
        // 所有摄像头数据（原始全集）
        private List<CameraInfo> _allCameras = new List<CameraInfo>();

        // 绑定到界面的数据（过滤后）
        public ObservableCollection<CameraInfo> DisplayCameras { get; set; } = new ObservableCollection<CameraInfo>();

        public CameraListControl()
        {
            InitializeComponent();
            CameraList.ItemsSource = DisplayCameras;

            // 初始加载服务器列表
            ReloadServers();
        }

        /// <summary>
        /// 公开方法：供主窗体在向导结束后调用，刷新下拉框
        /// </summary>
        public void ReloadServers()
        {
            var savedSelection = ServerCombo.SelectedItem as ServerOption;

            // 1. 转换全局配置到 ComboBox 选项
            var options = AppGlobalData.ActiveServerList
                .Select(n => new ServerOption { Ip = n.Ip, Port = n.Port })
                .ToList();

            ServerCombo.ItemsSource = options;

            // 2. 尝试恢复之前的选中项，或者默认选中第一个
            if (options.Count > 0)
            {
                if (savedSelection != null)
                {
                    var match = options.FirstOrDefault(o => o.Ip == savedSelection.Ip && o.Port == savedSelection.Port);
                    ServerCombo.SelectedItem = match ?? options[0];
                }
                else
                {
                    ServerCombo.SelectedItem = options[0];
                }
            }
            else
            {
                // 如果没有配置，清空列表
                _allCameras.Clear();
                DisplayCameras.Clear();
                UpdateEmptyState();
            }
        }

        private async void ServerCombo_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (ServerCombo.SelectedItem is ServerOption server)
            {
                // 切换服务器，加载数据
                LoadingMask.Visibility = Visibility.Visible;
                EmptyText.Visibility = Visibility.Collapsed;

                string url = $"http://{server.Ip}:{server.Port}/api/Cameras";

                try
                {
                    // 使用 HttpService 获取列表
                    var list = await HttpService.GetAsync<List<CameraInfo>>(url);

                    _allCameras = list ?? new List<CameraInfo>();

                    // 应用当前的搜索词
                    FilterList(SearchBox.Text);
                }
                catch
                {
                    // 失败清空
                    _allCameras.Clear();
                    DisplayCameras.Clear();
                }
                finally
                {
                    LoadingMask.Visibility = Visibility.Collapsed;
                    UpdateEmptyState();
                }
            }
        }

        private void SearchBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            FilterList(SearchBox.Text);
        }

        private void FilterList(string keyword)
        {
            DisplayCameras.Clear();

            if (string.IsNullOrWhiteSpace(keyword))
            {
                foreach (var c in _allCameras) DisplayCameras.Add(c);
            }
            else
            {
                var lowerKw = keyword.ToLower();
                var results = _allCameras.Where(c =>
                    (c.Name != null && c.Name.ToLower().Contains(lowerKw)) ||
                    (c.IpAddress != null && c.IpAddress.Contains(lowerKw))
                );

                foreach (var c in results) DisplayCameras.Add(c);
            }
        }

        private void UpdateEmptyState()
        {
            EmptyText.Visibility = DisplayCameras.Count == 0 ? Visibility.Visible : Visibility.Collapsed;
        }

        // 1. 定义一个事件：当设备被选中时触发
        public event System.Action<CameraInfo> OnDeviceSelected;

        // 2. 实现 ListView 的选中事件处理
        private void CameraList_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (CameraList.SelectedItem is CameraInfo selectedCam)
            {
                // 触发事件，把选中的相机传出去
                OnDeviceSelected?.Invoke(selectedCam);
            }
        }
    }
}