using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using LinFu.IoC.Configuration.Interfaces;
using LinFu.IoC.Interfaces;

namespace LinFu.IoC.Configuration
{
    /// <summary>
    ///     An <see cref="IMemberInjectionFilter{TMember}" /> implementation
    ///     that automatically selects properties whose property types
    ///     currently exist in the target container.
    /// </summary>
    public class PropertyInjectionFilter : BaseMemberInjectionFilter<PropertyInfo>
    {
        /// <summary>
        ///     Determines which members should be selected from the <paramref name="targetType" />
        ///     using the <paramref name="container" />
        /// </summary>
        /// <param name="targetType">The target type that will supply the list of members that will be filtered.</param>
        /// <param name="container">The target container.</param>
        /// <returns>A list of <see cref="PropertyInfo" /> objects that pass the filter description.</returns>
        protected override IEnumerable<PropertyInfo> GetMembers(Type targetType, IServiceContainer container)
        {
            var results =
                from p in targetType.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
                let propertyType = p.PropertyType
                let isServiceArray = propertyType.ExistsAsServiceArray()
                let isCompatible = isServiceArray(container) || container.Contains(propertyType)
                where p.CanWrite && isCompatible
                select p;

            return results;
        }
    }
}