using Microsoft.VisualBasic.ApplicationServices;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LB_SmartVisionCommon
{
    public class ImageEnhancementManager
    {
        private Dictionary<ImageEnhancementDataType, RecordImageEnhancementData> _filters;
        private readonly string _dataFilePath;
        private RecordImageEnhancementData _currentFilter;
        private static ImageEnhancementManager _instance;
        /// <summary>
        /// 线程锁
        /// </summary>
        private static readonly object _lock = new object();
        private ImageEnhancementManager(string dataFilePath = "imageEnhancements.json")
        {
            _dataFilePath = dataFilePath;
            _filters = new Dictionary<ImageEnhancementDataType, RecordImageEnhancementData>();
            _currentFilter = null;
            LoadUsers();
        }
        public static ImageEnhancementManager Instance
        {
            get
            {
                // 双重检查锁定确保线程安全
                if (_instance == null)
                {
                    lock (_lock)
                    {
                        if (_instance == null)
                        {
                            _instance = new ImageEnhancementManager();
                        }
                    }
                }
                return _instance;
            }
        }

        /// <summary>
        /// 添加图像增强算子
        /// </summary>
        /// <param name="user"></param>
        /// <returns></returns>
        public bool AddUser(RecordImageEnhancementData filter)
        {
            if (_currentFilter == null)
            {
                _currentFilter = filter;
            }

            try
            {
                RecordImageEnhancementData recordImageEnhancementData = new RecordImageEnhancementData();
                recordImageEnhancementData.MaskWidth = filter.MaskWidth;
                recordImageEnhancementData.MaskHight = filter.MaskHight;
                recordImageEnhancementData.Factor = filter.Factor;
                recordImageEnhancementData.FilterName = filter.FilterName;
                _filters.Add(recordImageEnhancementData.FilterName, recordImageEnhancementData);
            }
            catch (Exception ex) 
            {
                MessageBox.Show("该算子已存在");
            }
            SaveUsers();
            return true;
        }

        /// <summary>
        /// 删除图像增强算子
        /// </summary>
        /// <param name="filter"></param>
        /// <returns></returns>
        public bool DeleteUser(RecordImageEnhancementData filter)
        {
            try
            {
                // 1. 从字典中删除
                if (_filters.ContainsKey(filter.FilterName))
                {
                    _filters.Remove(filter.FilterName);
                }

                // 2. 如果删除的是当前滤波，清空_currentFilter
                if (_currentFilter != null && _currentFilter.FilterName == filter.FilterName)
                {
                    _currentFilter = null;
                }

                // 3. 保存更改
                SaveUsers();

                return true;
            }
            catch (Exception ex)
            {
                // 记录日志
                Console.WriteLine($"删除滤波失败: {ex.Message}");
                return false;
            }
        }

        
        /// <summary>
        /// 获取所有用户列表
        /// </summary>
        /// <returns>List<RecordUserData></returns>
        public List<RecordImageEnhancementData> GetAllUsers()
        {
            return _filters.Select(u => u.Value.Clone()).ToList();
        }

        #region json文件保存加载
        /// <summary>
        /// 保存用户数据到JSON文件
        /// </summary>
        private void SaveUsers()
        {
            try
            {
                ConfigManager<Dictionary<ImageEnhancementDataType, RecordImageEnhancementData>>.SaveConfig<Dictionary<ImageEnhancementDataType, RecordImageEnhancementData>>(_filters, _dataFilePath);
            }
            catch (Exception ex)
            {
                MessageBox.Show($"保存图像增强算子失败：{ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        /// <summary>
        /// 从JSON文件加载用户数据
        /// </summary>
        private void LoadUsers()
        {
            try
            {
                if (File.Exists(_dataFilePath))
                {
                    _filters = ConfigManager<Dictionary<ImageEnhancementDataType, RecordImageEnhancementData>>.LoadConfig<Dictionary<ImageEnhancementDataType, RecordImageEnhancementData>>(_dataFilePath) ?? new Dictionary<ImageEnhancementDataType, RecordImageEnhancementData>();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"加载图像增强算子失败：{ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                _filters = new Dictionary<ImageEnhancementDataType, RecordImageEnhancementData>();
            }
        }
        #endregion
    }
}