using Microsoft.Extensions.DependencyModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using Znyc.Recruitment.Admin.Commons.Options;

namespace Znyc.Recruitment.Admin.Commons.Helpers
{
    /// <summary>
    /// </summary>
    public class RuntimeHelper
    {
        /// <summary>
        ///     获取项目程序集，排除所有的系统程序集(Microsoft.***、System.***等)、Nuget下载包
        /// </summary>
        /// <returns></returns>
        public static IList<Assembly> GetAllAssemblies()
        {
            List<Assembly> list = new List<Assembly>();
            DependencyContext deps = DependencyContext.Default;
            //排除所有的系统程序集、Nuget下载包
            IEnumerable<CompilationLibrary> libs = deps.CompileLibraries.Where(lib => lib.Type == AssembleTypeConsts.Project); //只获取本项目用到的包
            foreach (CompilationLibrary lib in libs)
            {
                try
                {
                    Assembly assembly = AssemblyLoadContext.Default.LoadFromAssemblyName(new AssemblyName(lib.Name));
                    list.Add(assembly);
                }
                catch (Exception)
                {
                    // ignored
                }
            }

            return list;
        }

        /// <summary>
        ///     获取项目程序集，排除所有的系统程序集(Microsoft.***、System.***等)、Nuget下载包和Znyc.Recruitment.Admin.Commons.dll
        ///     获取所有关于Znyc的程序集
        /// </summary>
        /// <returns></returns>
        public static IList<Assembly> GetAllZnycAssemblies()
        {
            List<Assembly> list = new List<Assembly>();
            DependencyContext deps = DependencyContext.Default;
            //排除所有的系统程序集、Nuget下载包
            IEnumerable<CompilationLibrary> libs = deps.CompileLibraries.Where(lib =>
                lib.Type == AssembleTypeConsts.Project || lib.Name.StartsWith("Znyc")); //只获取本项目用到的包
            foreach (CompilationLibrary lib in libs)
            {
                try
                {
                    if (lib.Name != "Znyc.Recruitment.Admin.Commons")
                    {
                        Assembly assembly = AssemblyLoadContext.Default.LoadFromAssemblyName(new AssemblyName(lib.Name));
                        list.Add(assembly);
                    }
                }
                catch (Exception)
                {
                    // ignored
                }
            }

            return list;
        }

        /// <summary>
        /// </summary>
        /// <param name="assemblyName"></param>
        /// <returns></returns>
        public static Assembly GetAssembly(string assemblyName)
        {
            return GetAllZnycAssemblies().FirstOrDefault(assembly => assembly.FullName.Contains(assemblyName));
        }

        /// <summary>
        /// </summary>
        /// <returns></returns>
        public static IList<Type> GetAllTypes()
        {
            List<Type> list = new List<Type>();
            foreach (Assembly assembly in GetAllAssemblies())
            {
                IEnumerable<TypeInfo> typeInfos = assembly.DefinedTypes;
                foreach (TypeInfo typeInfo in typeInfos)
                {
                    list.Add(typeInfo.AsType());
                }
            }

            return list;
        }

        /// <summary>
        /// </summary>
        /// <param name="assemblyName"></param>
        /// <returns></returns>
        public static IList<Type> GetTypesByAssembly(string assemblyName)
        {
            List<Type> list = new List<Type>();
            Assembly assembly = AssemblyLoadContext.Default.LoadFromAssemblyName(new AssemblyName(assemblyName));
            IEnumerable<TypeInfo> typeInfos = assembly.DefinedTypes;
            foreach (TypeInfo typeInfo in typeInfos)
            {
                list.Add(typeInfo.AsType());
            }

            return list;
        }

        /// <summary>
        ///     获取实现类
        /// </summary>
        /// <param name="typeName"></param>
        /// <param name="baseInterfaceType"></param>
        /// <returns></returns>
        public static Type GetImplementType(string typeName, Type baseInterfaceType)
        {
            return GetAllTypes().FirstOrDefault(t =>
            {
                if (t.Name == typeName &&
                    t.GetTypeInfo().GetInterfaces().Any(b => b.Name == baseInterfaceType.Name))
                {
                    TypeInfo typeInfo = t.GetTypeInfo();
                    return typeInfo.IsClass && !typeInfo.IsAbstract && !typeInfo.IsGenericType;
                }

                return false;
            });
        }
    }
}