using System.Reflection;
using DispenserCommon.Ioc;

namespace DispenserCore.IOC;

public class IocScanner
{
    /// <summary>
    ///     扫描所有的类，将所有带有Component的类注册到IOC容器中
    /// </summary>
    public static List<IocService> Scan()
    {
        var components = GetAssemblies()
            .SelectMany(a => a.GetTypes()
                .Where(t => t.GetCustomAttributes(typeof(Component), true).Length > 0))
            .ToList();
        List<IocService> services = [];
        components.ForEach(component =>
        {
            var attribute = component.GetCustomAttribute<Component>();
            services.Add(new IocService(attribute?.Type ?? component, component));
        });
        return services;
    }

    private static IEnumerable<Assembly> GetAssemblies()
    {
        var assemblies = new List<Assembly>();
        foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
        {
            var name = assembly.GetName().Name;
            if (name != null && name.ToLower().Contains("dispenser")) GetReferenceAssemblies(assembly, assemblies);
        }

        return assemblies;
    }

    private static void GetReferenceAssemblies(Assembly assembly, ICollection<Assembly> assemblies)
    {
        foreach (var assemblyName in assembly.GetReferencedAssemblies())
        {
            var name = assemblyName.Name;
            if (name != null && name.ToLower().Contains("dispenser"))
            {
                var ass = Assembly.Load(assemblyName);
                if (assemblies.Contains(ass)) continue;
                assemblies.Add(ass);
                GetReferenceAssemblies(ass, assemblies);
            }
        }
    }
}