using AcDream.Plugin.Abstractions;
using OpenAC.MosswartMassacre.Backend;
using OpenAC.MosswartMassacre.Inventory;
using static OpenAC.MosswartMassacre.Tests.Inventory.InventoryWorld;

namespace OpenAC.MosswartMassacre.Tests.Inventory;

public sealed class DecalItemBuilderTests
{
    [Fact]
    public void With_the_header_flags_known_a_field_sent_as_zero_is_present_and_an_unsent_one_absent()
    {
        // The original's dumps hold "218103822": 0 for items whose header
        // carried a zero equipable-slots field (1153 of 3058 items).
        PluginInventoryItem tapers = Tapers();
        uint flags = HeaderFlags.Value | HeaderFlags.Usable | HeaderFlags.ValidLocations
            | HeaderFlags.StackSize | HeaderFlags.MaxStackSize | HeaderFlags.PluralName;

        MyWorldObject record = DecalItemBuilder.Create(new ItemSource(
            tapers, null, false, 0, new ItemHeaderWords { WeenieHeaderFlags = flags }));

        Assert.Equal(0, record.IntValues[DecalKeys.EquipableSlots]);
        Assert.Equal(unchecked((int)flags), record.IntValues[DecalKeys.CreateFlags1]);
        Assert.False(record.IntValues.ContainsKey(DecalKeys.RawBurden));
    }

    [Fact]
    public void Without_the_header_flags_a_zero_field_is_left_out_and_the_value_key_reads_minus_one()
    {
        PluginInventoryItem bare = FakeItemsBare(0x80000555u, "Bare Thing");

        MyWorldObject record = DecalItemBuilder.Create(new ItemSource(bare, null, false, 0, default));

        Assert.Equal(-1, record.IntValues[DecalKeys.RawValue]);
        Assert.Equal(-1, record.Value);
        Assert.False(record.IntValues.ContainsKey(DecalKeys.EquipableSlots));
        Assert.False(record.IntValues.ContainsKey(DecalKeys.CreateFlags1));
        Assert.False(record.IntValues.ContainsKey(DecalKeys.PhysicsDataFlags));
        Assert.False(record.IntValues.ContainsKey(DecalKeys.Setup));
    }

    [Fact]
    public void The_physics_and_second_header_words_are_written_when_known()
    {
        PluginInventoryItem tachi = Tachi(appraised: false);
        var words = new ItemHeaderWords
        {
            WeenieHeaderFlags2 = 1u,
            PhysicsDescriptionFlags = 0x21881u,
            PhysicsWord = 17u,
            SetupId = 0x02000155u,
            Scale = 0d,
            ParentObjectId = Me,
            ParentLocation = 1,
            HookType = 2,
        };

        MyWorldObject record = DecalItemBuilder.Create(new ItemSource(tachi, null, false, 0, words));

        Assert.Equal(1, record.IntValues[DecalKeys.CreateFlags2]);
        Assert.Equal(0x21881, record.IntValues[DecalKeys.PhysicsDataFlags]);
        Assert.Equal(17, record.IntValues[DecalKeys.PhysicsWord]);
        Assert.Equal(0x02000155, record.IntValues[DecalKeys.Setup]);
        Assert.Equal(0d, record.DoubleValues[DecalKeys.Scale]);
        Assert.Equal(unchecked((int)Me), record.IntValues[DecalKeys.Wielder]);
        Assert.Equal(1, record.IntValues[DecalKeys.WieldingSlot]);
        Assert.Equal(2, record.IntValues[DecalKeys.HookType]);
    }

    [Fact]
    public void Combine_keeps_an_earlier_appraisal_and_refreshes_it_from_the_live_item()
    {
        // MyWorldObjectCreator.cs:44-61.
        MyWorldObject older = DecalItemBuilder.Create(new ItemSource(
            Tachi(appraised: true), TachiProps(), true, 1700000000, default));
        PluginInventoryItem moved = Tachi(appraised: false) with { WielderObjectId = 0u, ContainerObjectId = 0x80000900u };
        MyWorldObject newer = DecalItemBuilder.Create(new ItemSource(moved, null, false, 0, default));

        MyWorldObject combined = DecalItemBuilder.Combine(older, newer);

        Assert.Same(older, combined);
        Assert.True(combined.HasIdData);
        Assert.Equal(1700000000, combined.LastIdTime);
        Assert.Equal([2598, 2603], combined.Spells);
        Assert.Equal(50, combined.MaxDamage);
        Assert.Equal(unchecked((int)0x80000900u), combined.ContainerId);
        Assert.Equal(unchecked((int)0x80000900u), combined.IntValues[DecalKeys.Container]);
        Assert.Equal(combined.IntValues.Keys.Order(), combined.IntValues.Keys);
    }

    [Fact]
    public void Combine_takes_the_live_item_when_it_is_appraised_or_the_old_one_was_not()
    {
        MyWorldObject older = DecalItemBuilder.Create(new ItemSource(Tapers(), null, false, 0, default));
        MyWorldObject newer = DecalItemBuilder.Create(new ItemSource(Tapers(60), null, false, 0, default));

        Assert.Same(newer, DecalItemBuilder.Combine(older, newer));
    }

    [Fact]
    public void A_saved_record_reads_back_and_writes_the_same_frame()
    {
        MyWorldObject record = DecalItemBuilder.Create(new ItemSource(
            Breastplate(), BreastplateProps(), true, 1790325015, default));
        string json = Wire.Serialize(record);

        MyWorldObject? back = Newtonsoft.Json.JsonConvert.DeserializeObject<MyWorldObject>(json);

        Assert.Equal(json, Wire.Serialize(back));
    }

    private static PluginInventoryItem FakeItemsBare(uint id, string name) =>
        Fakes.FakeItems.Item(id, name) with { ObjectClass = PluginObjectClass.Misc, MaximumStackSize = 1 };
}