using Arch.Core;
using HSchool.Ai;
using HSchool.Content;

namespace HSchool.Simulation.Tests;

public class NeedDecayTests
{
    [Fact]
    public void Hunger_DropsByDecayPerHourOnCampus()
    {
        var catalog = VanillaCatalog();
        var hunger = catalog.Needs["Hunger"];
        var world = World.Create();
        try
        {
            world.Create(
                new PersonNeeds(new Dictionary<string, float>(StringComparer.Ordinal) { ["Hunger"] = hunger.Initial }),
                new Presence("cafeteria", 0f, "cafeteria", false, []));
            NeedDecay.Apply(world, catalog, gameMinutes: 60);

            var query = new QueryDescription().WithAll<PersonNeeds>();
            world.Query(
                in query,
                (ref PersonNeeds needs) =>
                    Assert.Equal(hunger.Initial - hunger.DecayPerHour, needs.Values["Hunger"], precision: 4));
        }
        finally
        {
            World.Destroy(world);
        }
    }

    [Fact]
    public void Sleep_ReturnsToMaxOffCampus()
    {
        var catalog = VanillaCatalog();
        var world = World.Create();
        try
        {
            world.Create(
                new PersonNeeds(new Dictionary<string, float>(StringComparer.Ordinal)
                {
                    ["Sleep"] = 0.2f,
                    ["Hunger"] = 0.4f,
                }),
                Presence.OffCampus);
            NeedDecay.Apply(world, catalog, gameMinutes: 60);

            var query = new QueryDescription().WithAll<PersonNeeds>();
            world.Query(in query, (ref PersonNeeds needs) =>
            {
                Assert.Equal(catalog.Needs["Sleep"].Max, needs.Values["Sleep"]);
                Assert.Equal(0.4f, needs.Values["Hunger"]);
            });
        }
        finally
        {
            World.Destroy(world);
        }
    }

    [Fact]
    public void SameInputs_LeaveTheSameNeedValues()
    {
        var catalog = VanillaCatalog();
        var first = HungerAfterHour(catalog);
        var second = HungerAfterHour(catalog);
        Assert.Equal(first, second);
    }

    private static float HungerAfterHour(DefCatalog catalog)
    {
        var world = World.Create();
        try
        {
            world.Create(
                new PersonNeeds(new Dictionary<string, float>(StringComparer.Ordinal) { ["Hunger"] = 1f }),
                new Presence("cafeteria", 0f, "cafeteria", false, []));
            NeedDecay.Apply(world, catalog, gameMinutes: 60);
            var value = 0f;
            var query = new QueryDescription().WithAll<PersonNeeds>();
            world.Query(in query, (ref PersonNeeds needs) => value = needs.Values["Hunger"]);
            return value;
        }
        finally
        {
            World.Destroy(world);
        }
    }

    private static DefCatalog VanillaCatalog()
    {
        var root = Path.Combine(AppContext.BaseDirectory, "vanilla");
        var documents = new List<ContentDocument>();
        foreach (var path in Directory.EnumerateFiles(root, "*.*", SearchOption.AllDirectories))
        {
            if (!path.EndsWith(".jsonc", StringComparison.OrdinalIgnoreCase)
                && !path.EndsWith(".json", StringComparison.OrdinalIgnoreCase))
            {
                continue;
            }

            var relative = Path.GetRelativePath(root, path).Replace('\\', '/');
            documents.Add(new ContentDocument(CatalogLoader.CorePackId, relative, File.ReadAllText(path)));
        }

        return new CatalogLoader().Load([CatalogLoader.CorePackId], documents);
    }
}