using Avalonia.Controls;
using Avalonia.Controls.Templates;
using Cowain.Base.Helpers;
using Cowain.Base.ViewModels;
using Cowain.TestProject.ViewModels;
using System;
using System.Text.RegularExpressions;

namespace Cowain.TestProject
{
    /// <summary>
    /// 视图定位器，根据视图模型定位视图
    /// </summary>
    public class ViewLocator : IDataTemplate
    {

        public Control? Build(object? param)
        {
            if (param is null)
                return null;
            var dataType = param.GetType();
            var name = dataType.FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
            //var type = Type.GetType(name);
            // 完全限定名
            var type = Type.GetType($"{name}, {GetAssemblyName(dataType)}");

            if (type != null)
            {
                return (Control)Activator.CreateInstance(type)!;
            }
            return new TextBlock { Text = "Not Found: " + name };
        }

        public bool Match(object? data)
        {
            return data is ViewModelBase || data is PageViewModelBase;
        }

        /// <summary>
        /// 获取程序集名称
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        private string GetAssemblyName(Type type)
        {
            // 类型的完整名称
            string? input = type.AssemblyQualifiedName;
            if (input is null)
            {
                return string.Empty;
            }

            // 正则表达式匹配两个逗号之间的内容
            var match = Regex.Match(input, ",(.*?),");
            return match.Success ? match.Groups[1].Value.Trim() : string.Empty;
        }
    }
}