using AcDream.Core.Items;
using AcDream.Runtime.Entities;
using AcDream.Runtime.Gameplay;

namespace AcDream.Runtime.Tests.Gameplay;

public sealed class RuntimeInventoryStateTests
{
    [Fact]
    public void ViewBorrowsTransactionShortcutAndManaOwners()
    {
        using var entities = new RuntimeEntityObjectLifetime();
        using var inventory = new RuntimeInventoryState(entities);
        inventory.Shortcuts.Replace(
        [
            new AcDream.Core.Items.ShortcutEntry(3, 0x80000001u, 0u),
            new AcDream.Core.Items.ShortcutEntry(4, 0u, 42u),
        ]);
        inventory.ItemMana.OnQueryItemManaResponse(
            0x80000001u,
            0.75f,
            valid: true);
        inventory.Transactions.IncrementBusyCount();

        RuntimeInventoryStateSnapshot snapshot = inventory.View.Snapshot;

        Assert.Equal(2, snapshot.ShortcutCount);
        Assert.Equal(1, snapshot.ItemManaCount);
        Assert.Equal(1, snapshot.BusyCount);
        Assert.False(snapshot.CanBeginRequest);
        Assert.True(inventory.View.TryGetShortcut(
            3,
            out RuntimeShortcutSnapshot itemShortcut));
        Assert.Equal(
            new RuntimeShortcutSnapshot(3, 0x80000001u, 0u),
            itemShortcut);
        Assert.True(inventory.View.TryGetShortcut(
            4,
            out RuntimeShortcutSnapshot spellShortcut));
        Assert.Equal(new RuntimeShortcutSnapshot(4, 0u, 42u), spellShortcut);
        Assert.True(inventory.View.TryGetItemMana(
            itemShortcut.ObjectId,
            out float fraction));
        Assert.Equal(0.75f, fraction);
    }

    [Fact]
    public void OwnsOneGameplayGraphOverExactEntityObjectTable()
    {
        using var entities = new RuntimeEntityObjectLifetime();
        using var inventory = new RuntimeInventoryState(entities);
        IReadOnlyList<ShortcutEntry> shortcuts =
            [new ShortcutEntry(2, 0x50000001u, 0u)];

        inventory.ExternalContainers.RequestOpen(0x70000001u);
        inventory.ExternalContainers.ApplyViewContents(0x70000001u);
        inventory.ItemMana.OnQueryItemManaResponse(0x50000001u, 0.75f, true);
        inventory.Shortcuts.Replace(shortcuts);

        Assert.Same(entities.Objects, inventory.Objects);
        Assert.Equal(0x70000001u, inventory.ExternalContainers.CurrentContainerId);
        Assert.Equal(0.75f, inventory.ItemMana.GetManaPercent(0x50000001u));
        Assert.Same(shortcuts, inventory.Shortcuts.Items);
        Assert.Equal(1, inventory.Shortcuts.Revision);
    }

    [Fact]
    public void ResetOperationsClearOnlyTheirOwnedLifetimeGroup()
    {
        using var entities = new RuntimeEntityObjectLifetime();
        using var inventory = new RuntimeInventoryState(entities);
        inventory.ExternalContainers.RequestOpen(0x70000001u);
        inventory.ExternalContainers.ApplyViewContents(0x70000001u);
        inventory.ItemMana.OnQueryItemManaResponse(0x50000001u, 0.75f, true);
        inventory.Shortcuts.Replace([new ShortcutEntry(1, 2u, 3u)]);
        inventory.Transactions.IncrementBusyCount();

        inventory.ResetExternalContainer();
        Assert.Equal(0u, inventory.ExternalContainers.CurrentContainerId);
        Assert.True(inventory.ItemMana.HasMana(0x50000001u));
        Assert.NotEmpty(inventory.Shortcuts.Items);
        Assert.Equal(1, inventory.Transactions.BusyCount);

        inventory.ResetTransactions();
        inventory.ResetItemMana();
        inventory.ResetPlayerSnapshots();

        Assert.Equal(0, inventory.Transactions.BusyCount);
        Assert.False(inventory.ItemMana.HasMana(0x50000001u));
        Assert.Empty(inventory.Shortcuts.Items);
    }

    [Fact]
    public void IndependentRuntimeInstancesNeverShareState()
    {
        using var firstEntities = new RuntimeEntityObjectLifetime();
        using var secondEntities = new RuntimeEntityObjectLifetime();
        using var first = new RuntimeInventoryState(firstEntities);
        using var second = new RuntimeInventoryState(secondEntities);

        first.Shortcuts.Replace([new ShortcutEntry(1, 2u, 3u)]);
        first.Transactions.IncrementBusyCount();

        Assert.NotSame(first.Objects, second.Objects);
        Assert.Single(first.Shortcuts.Items);
        Assert.Empty(second.Shortcuts.Items);
        Assert.Equal(1, first.Transactions.BusyCount);
        Assert.Equal(0, second.Transactions.BusyCount);
    }

    [Fact]
    public void DisposeDetachesTransactionsAndClearsOwnedState()
    {
        using var entities = new RuntimeEntityObjectLifetime();
        var inventory = new RuntimeInventoryState(entities);
        inventory.ExternalContainers.RequestOpen(0x70000001u);
        inventory.ExternalContainers.ApplyViewContents(0x70000001u);
        inventory.ItemMana.OnQueryItemManaResponse(0x50000001u, 0.5f, true);
        inventory.Shortcuts.Replace([new ShortcutEntry(1, 2u, 3u)]);

        inventory.Dispose();
        inventory.Dispose();

        Assert.True(inventory.IsDisposed);
        Assert.True(inventory.Transactions.IsDisposed);
        Assert.Equal(0u, inventory.ExternalContainers.CurrentContainerId);
        Assert.False(inventory.ItemMana.HasMana(0x50000001u));
        Assert.Empty(inventory.Shortcuts.Items);
    }

    [Fact]
    public void DisposalRetriesATransientOwnerObserverFailureToConvergence()
    {
        using var entities = new RuntimeEntityObjectLifetime();
        var inventory = new RuntimeInventoryState(entities);
        inventory.ExternalContainers.RequestOpen(0x70000001u);
        inventory.ExternalContainers.ApplyViewContents(0x70000001u);
        bool fail = true;
        inventory.ExternalContainers.Changed += _ =>
        {
            if (fail)
            {
                fail = false;
                throw new InvalidOperationException("transient");
            }
        };

        Assert.Throws<AggregateException>(inventory.Dispose);
        Assert.False(inventory.IsDisposed);
        Assert.True(inventory.Transactions.IsDisposed);

        inventory.Dispose();

        Assert.True(inventory.IsDisposed);
        Assert.Equal(0u, inventory.ExternalContainers.CurrentContainerId);
    }
}