using MgTestAdmin.Model;
using System;
using System.Collections.Generic;
using System.Linq;

namespace MgTestAdmin
{
    public class OperationProviderService
    {
        private IOperationProvider[] _providers;

        public OperationProviderService()
        {
            _providers = typeof(OperationProviderService)
                .Assembly
                .GetTypes()
                .Where(t => t.IsClass && !t.IsAbstract && typeof(IOperationProvider).IsAssignableFrom(t))
                .Select(t => (IOperationProvider)Activator.CreateInstance(t, true))
                .ToArray();
        }

        public IEnumerable<string> GetCategories()
        {
            return _providers.GroupBy(p => p.Category).Select(g => g.Key).OrderBy(c => c);
        }

        public IEnumerable<IOperationProvider> GetProviders(string category)
        {
            return _providers.Where(p => p.Category == category).OrderBy(p => p.Name);
        }
    }
}