using System.Collections.Generic;
using UnitTestSharp;
using Vellum;

namespace Amphora.Vellum.UnitTests
{
    public class SaveConverterTests : TestFixture
    {
        /// <summary>
        /// Writes <paramref name="node"/> as Lua text, inside the table a save has to be, and reads it back.
        /// </summary>
        public static SaveNode ThroughLuaText(SaveNode node)
        {
            SaveNode save = SaveNode.NewTable();
            save.Entries["value"] = node;
            return LuaSaveFormat.Parse(LuaSaveFormat.Format(save)).RequireEntry("value");
        }

        public class ForTests : TestFixture
        {
            public void ThisAssembly_SavesTheContainersThroughItsReferences()
            {
                SaveSession session = SaveConverters.For(typeof(SaveConverterTests).Assembly).CreateSession();
                var value = new Inventory();
                value.Route.Add(new Vector { X = 1.5 });
                value.Stops["home"] = new Vector { Y = 4 };
                value.Stops["mine"] = new Vector { X = -1 };
                SaveNode node = ThroughLuaText(session.ToNode(value, typeof(Inventory)));
                var loaded = (Inventory)session.FromNode(node, typeof(Inventory));

                CheckEqual(1.5, loaded.Route[0].X);
                CheckEqual(new[] { "home", "mine" }, new List<string>(loaded.Stops.Keys));
                CheckEqual(4.0, loaded.Stops["home"].Y);
            }

            public void TheLibrary_NamesBothConverters()
            {
                SaveSession session = SaveConverters.For(typeof(DynamicArrayConverter<>).Assembly).CreateSession();

                CheckEqual(SaveNode.Kinds.List,
                    session.ToNode(new DynamicArray<int>(), typeof(DynamicArray<int>)).Kind);
                CheckEqual(SaveNode.Kinds.Table,
                    session.ToNode(new OrderedDictionary<int, int>(), typeof(OrderedDictionary<int, int>)).Kind);
            }
        }
    }
}