using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Data;

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;

using QuickModeling.Models;

namespace QuickModeling.ViewModels
{
    public partial class ConfigurationViewModel : ObservableValidator
    {
        [ObservableProperty]
        private ComponentConfig config;
        [ObservableProperty]
        private Parameter parameter = new Parameter();
        [ObservableProperty]
        [NotifyCanExecuteChangedFor(nameof(AddGroupCommand))]
        private string groupName;

        public ObservableCollection<string> Groups { get; set; } = new ObservableCollection<string>();

        public ConfigurationViewModel(ComponentConfig config)
        {
            this.config = config;
            var gs = config.Parameters.Select(p => p.Group).ToList();
            foreach (var group in gs)
            {
                if (!string.IsNullOrEmpty(group) && !Groups.Contains(group))
                {
                    Groups.Add(group);
                }
            }
            var cv = CollectionViewSource.GetDefaultView(config.Parameters);
            //不包含这个分组属性，则添加，避免重复分组
            if (!cv.GroupDescriptions
                .Any(g => g is PropertyGroupDescription description && description.PropertyName == "Group"))
            {
                cv.GroupDescriptions.Add(new PropertyGroupDescription("Group"));
            }
            //Parameters = config.Parameters;
        }

        private bool CanAddGroup => !string.IsNullOrEmpty(GroupName) && !Groups.Contains(GroupName);

        [RelayCommand(CanExecute = nameof(CanAddGroup))]
        private void AddGroup()
        {
            Groups.Add(GroupName);
            Parameter.Group = GroupName;
            GroupName = string.Empty;
        }

        [ObservableProperty]
        private string description;
        [RelayCommand]
        private void SendConfig(Window window)
        {
            var groups = Config.Parameters.GroupBy(p => p.FullName).Where(g => g.Count() > 1).ToList();
            StringBuilder sb = new StringBuilder();
            if (groups.Any())
            {
                foreach (var group in groups)
                {
                    sb.AppendLine($"参数 '{group.FirstOrDefault().FullName}' 已存在重复项");
                }
                MessageBox.Show(sb.ToString(), "重复参数", MessageBoxButton.OK, MessageBoxImage.Warning);
                return;
            }

            var parameterHasErrors = Config.Parameters.Where(p => p.HasErrors);
            if (parameterHasErrors.Any())
            {
                string errorMessage = string.Join(
                    "\n",
                    parameterHasErrors.Select(
                        p => $"{p.Group}-{p.Name}: {p.GetErrors().FirstOrDefault()?.ErrorMessage}"));

                MessageBox.Show(errorMessage);
                return;
            }
            ValidateAllProperties();
            if (!HasErrors)
            {
                WeakReferenceMessenger.Default.Send(Config, "config");
                window?.Close();
            }
            else
            {
                MessageBox.Show(GetErrors().FirstOrDefault().ErrorMessage);
            }
        }

        [RelayCommand]
        private void EditParameter(Parameter parameter)
        {
            if (parameter != null && config.Parameters.Contains(parameter))
            {
                var copy = parameter.Clone() as Parameter;
                Parameter = copy;
            }
        }

        [RelayCommand]
        private void DeleteParameter(Parameter parameter)
        {
            if (parameter != null && config.Parameters.Contains(parameter))
            {
                var result = MessageBox.Show(
                    $"确定要删除参数 '{parameter.Name}' 吗？",
                    "删除参数",
                    MessageBoxButton.YesNo,
                    MessageBoxImage.Question);
                if (result == MessageBoxResult.No)
                {
                    return;
                }
                config.Parameters.Remove(parameter);
            }
        }

        [RelayCommand]
        private void CloseWindow(Window window) { window?.Close(); }
        [RelayCommand]
        private void AddParameter()
        {
            if (string.IsNullOrEmpty(Parameter.Name))
            {
                MessageBox.Show("参数名称不能为空，请选择后再添加。", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                return;
            }
            if (string.IsNullOrEmpty(Parameter.Group))
            {
                MessageBox.Show("参数分组不能为空，请填写后再添加。", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                return;
            }
            if (config.Parameters.Any(p => p.Group == Parameter.Group && p.Name == Parameter.Name))
            {
                MessageBox.Show("该分组下已存在同名参数，请修改名称后再添加。", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            else
            {
                var copy = Parameter.Clone() as Parameter; // 克隆参数，避免引用问题
                bool isValid = true;
                object value;
                switch (copy.DataType)
                {
                    case TypeKind.Boolean:
                        isValid = bool.TryParse(copy.Value?.ToString(), out bool boolValue);
                        value = boolValue;
                        break;
                    //case TypeKind.DateTime:
                    //    isValid = DateTime.TryParse(copy.Value.ToString(), out DateTime dateTimeValue);
                    //    value = dateTimeValue;
                    //    break;
                    case TypeKind.Double:
                        isValid = double.TryParse(copy.Value?.ToString(), out double doubleValue);
                        value = doubleValue;
                        break;
                    case TypeKind.Integer:
                        isValid = int.TryParse(copy.Value?.ToString(), out int intValue);
                        break;
                    //case TypeKind.Point:
                    //    break;
                    case TypeKind.String:
                        value = copy.Value?.ToString() ?? string.Empty;
                        break;
                }
                if (!isValid)
                {
                    MessageBox.Show(
                        $"参数 '{copy.Name}' 的值 '{copy.Value}' 无效，请检查数据类型。",
                        "提示",
                        MessageBoxButton.OK,
                        MessageBoxImage.Warning);
                    return;
                }
                config.Parameters.Add(copy);
            }
        }

        /// <summary>
        /// 配置名称
        /// </summary>
        //[Required(ErrorMessage = "配置名称不能为空")]
        //public string ConfigName { get => configName; set => SetProperty(ref configName, value, true); }

        ///// <summary>
        ///// 参数
        ///// </summary>
        //public ObservableCollection<Parameter> Parameters { get; set; } = new ObservableCollection<Parameter>();
    }
}