using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using Luticate2.Auth.Dbo.Result;
using Luticate2.Auth.Interfaces;

namespace Luticate2.Auth.Business.Fields.DMEC
{
    public class LuExpressionConverterStaticMethods : LuExpressionConverter<LuExpressionConverterStaticMethods, LuExpressionConverterStaticMethods>
    {
        public IDictionary<Type, Type> Converters { get; } = new Dictionary<Type, Type>();

        public LuExpressionConverterStaticMethods(IServiceProvider serviceProvider) : base(serviceProvider)
        {
            Converters.Add(typeof(Enumerable), typeof(LuExpressionConverterEnumerable));
        }

        protected override LuResult<Expression> ConvertInternal(Stack<Expression> expressions, Expression baseExpression, LuExpressionConverterOptions options)
        {
            var expression = expressions.Peek();
            if (expression is MethodCallExpression methodCallExpression)
            {
                if (Converters.ContainsKey(methodCallExpression.Method.DeclaringType))
                {
                    var type = Converters[methodCallExpression.Method.DeclaringType];
                    var service = (ILuExpressionConverter) ServiceProvider.GetService(type);
                    return service.ConvertExpression(expressions, baseExpression, options);
                }
            }

            return base.ConvertInternal(expressions, baseExpression, options);
        }
    }
}