using System;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;

namespace Flow.Launcher.Core.Plugin
{
    internal class PluginAssemblyLoader : AssemblyLoadContext
    {
        private readonly AssemblyDependencyResolver dependencyResolver;

        private readonly AssemblyName assemblyName;

        internal PluginAssemblyLoader(string assemblyFilePath)
        {
            dependencyResolver = new AssemblyDependencyResolver(assemblyFilePath);
            assemblyName = new AssemblyName(Path.GetFileNameWithoutExtension(assemblyFilePath));
        }

        internal Assembly LoadAssemblyAndDependencies()
        {
            return LoadFromAssemblyName(assemblyName);
        }

        protected override Assembly Load(AssemblyName assemblyName)
        {
            string assemblyPath = dependencyResolver.ResolveAssemblyToPath(assemblyName);

            if (assemblyPath != null)
            {
                return LoadFromAssemblyPath(assemblyPath);
            }

            return null;
        }

        internal Type FromAssemblyGetTypeOfInterface(Assembly assembly, Type type)
        {
            var allTypes = assembly.ExportedTypes;

            return allTypes.First(o => o.IsClass && !o.IsAbstract && o.GetInterfaces().Contains(type));
        }
    }
}