using AcDream.Core.Items;
using Xunit;

namespace AcDream.Core.Tests.Items;

public sealed class ItemRepositoryTests
{
    private static ItemInstance MakeItem(uint id, string name = "Widget") =>
        new ItemInstance
        {
            ObjectId = id,
            WeenieClassId = 1,
            Name = name,
            Type = ItemType.Misc,
            StackSize = 1,
            Burden = 10,
            Value = 5,
        };

    [Fact]
    public void AddOrUpdate_FiresAddedEvent()
    {
        var repo = new ItemRepository();
        ItemInstance? added = null;
        repo.ItemAdded += i => added = i;

        var item = MakeItem(100);
        repo.AddOrUpdate(item);

        Assert.Same(item, added);
        Assert.Equal(1, repo.ItemCount);
        Assert.Same(item, repo.GetItem(100));
    }

    [Fact]
    public void AddOrUpdate_ExistingItem_FiresPropertiesUpdated()
    {
        var repo = new ItemRepository();
        var item = MakeItem(100);
        repo.AddOrUpdate(item);

        int propUpdateCount = 0;
        repo.ItemPropertiesUpdated += _ => propUpdateCount++;

        repo.AddOrUpdate(item);    // second call is an update
        Assert.Equal(1, propUpdateCount);
    }

    [Fact]
    public void MoveItem_UpdatesContainerAndFiresEvent()
    {
        var repo = new ItemRepository();
        var item = MakeItem(100);
        repo.AddOrUpdate(item);

        uint seenOld = 999, seenNew = 999;
        repo.ItemMoved += (it, oldC, newC) => { seenOld = oldC; seenNew = newC; };

        repo.MoveItem(100, 42, newSlot: 3);

        Assert.Equal(0u, seenOld);   // was not in any container initially
        Assert.Equal(42u, seenNew);
        Assert.Equal(42u, item.ContainerId);
        Assert.Equal(3,   item.ContainerSlot);
    }

    [Fact]
    public void MoveItem_Nonexistent_ReturnsFalse()
    {
        var repo = new ItemRepository();
        Assert.False(repo.MoveItem(999, 42));
    }

    [Fact]
    public void Remove_FiresEventAndRemoves()
    {
        var repo = new ItemRepository();
        var item = MakeItem(100);
        repo.AddOrUpdate(item);

        ItemInstance? removed = null;
        repo.ItemRemoved += i => removed = i;

        Assert.True(repo.Remove(100));
        Assert.Same(item, removed);
        Assert.Null(repo.GetItem(100));
    }

    [Fact]
    public void UpdateProperties_MergesIncomingBundle()
    {
        var repo = new ItemRepository();
        var item = MakeItem(100);
        item.Properties.Ints[1] = 10;
        repo.AddOrUpdate(item);

        var patch = new PropertyBundle();
        patch.Ints[2] = 20;          // new
        patch.Ints[1] = 15;          // overrides
        patch.Strings[100] = "desc";
        repo.UpdateProperties(100, patch);

        Assert.Equal(15, item.Properties.Ints[1]);
        Assert.Equal(20, item.Properties.Ints[2]);
        Assert.Equal("desc", item.Properties.Strings[100]);
    }

    [Fact]
    public void Clear_RemovesAllItems()
    {
        var repo = new ItemRepository();
        repo.AddOrUpdate(MakeItem(1));
        repo.AddOrUpdate(MakeItem(2));
        repo.AddOrUpdate(MakeItem(3));

        repo.Clear();
        Assert.Equal(0, repo.ItemCount);
    }

    [Fact]
    public void EnrichItem_updatesIconOnExistingStub_andRaisesUpdated()
    {
        var repo = new ItemRepository();
        repo.AddOrUpdate(new ItemInstance { ObjectId = 0x5001u, WeenieClassId = 42u }); // stub from PlayerDescription
        ItemInstance? updated = null;
        repo.ItemPropertiesUpdated += i => updated = i;

        bool hit = repo.EnrichItem(0x5001u, iconId: 0x06001234u, name: "Mana Stone", type: ItemType.Misc);

        Assert.True(hit);
        Assert.Equal(0x06001234u, repo.GetItem(0x5001u)!.IconId);
        Assert.Equal("Mana Stone", repo.GetItem(0x5001u)!.Name);
        Assert.NotNull(updated);
    }

    [Fact]
    public void EnrichItem_returnsFalse_whenItemUnknown()
    {
        var repo = new ItemRepository();
        Assert.False(repo.EnrichItem(0x9999u, 0x06001234u, "x", ItemType.Misc));
    }

    [Fact]
    public void EnrichItem_carriesEffects()
    {
        var repo = new ItemRepository();
        repo.AddOrUpdate(new ItemInstance { ObjectId = 0x500000AAu });
        bool ok = repo.EnrichItem(0x500000AAu, iconId: 0x06001234u, name: "Wand",
            type: ItemType.Caster, iconOverlayId: 0, iconUnderlayId: 0, effects: 0x1u);
        Assert.True(ok);
        Assert.Equal(0x1u, repo.GetItem(0x500000AAu)!.Effects);
    }

    [Fact]
    public void UpdateIntProperty_uiEffects_setsEffectsAndFires()
    {
        var repo = new ItemRepository();
        repo.AddOrUpdate(new ItemInstance { ObjectId = 0x500000ABu });
        ItemInstance? fired = null;
        repo.ItemPropertiesUpdated += i => fired = i;
        bool ok = repo.UpdateIntProperty(0x500000ABu, ItemRepository.UiEffectsPropertyId, value: 0x9);
        Assert.True(ok);
        Assert.Equal(0x9u, repo.GetItem(0x500000ABu)!.Effects);
        Assert.Equal(0x9, repo.GetItem(0x500000ABu)!.Properties.Ints[ItemRepository.UiEffectsPropertyId]);
        Assert.NotNull(fired);
    }

    [Fact]
    public void UpdateIntProperty_unknownItem_returnsFalse()
    {
        var repo = new ItemRepository();
        Assert.False(repo.UpdateIntProperty(0xDEADBEEFu, 18u, 1));
    }
}