using AcDream.Core.Items;
using AcDream.Core.Net.Messages;
using AcDream.Core.Properties;
using AcDream.Runtime.Gameplay;

namespace AcDream.Runtime.Tests.Gameplay;

/// <summary>
/// House-tab conformance (Batch C, 2026-08-17): the ONE decomp-verified
/// line <c>gmHouseUI::DisplayPurchaseTimeText @0x004a3110</c> emits for a
/// houseless/fresh character, and the wait-period-not-expired case that
/// stays empty (unrecoverable strftime format, ISSUES #413 item 2).
/// </summary>
public sealed class RuntimeHouseStateTests
{
    private const uint Self = 0x50000001u;

    [Fact]
    public void EmptyBeforeAnyNoticeArrives()
    {
        // gmHouseUI::PostInit never calls Update/DisplayHouseData — the
        // ListBox starts genuinely empty (live-DAT-confirmed: the House
        // page's ListBox children=0, no other page content).
        var house = new RuntimeHouseState();

        Assert.Empty(house.Lines);
        Assert.False(house.HasReceivedNotice);
    }

    [Fact]
    public void HouseStatus_FreshCharacterWithNoTimestamp_ShowsBuyImmediatelyLine()
    {
        var objects = new ClientObjectTable();
        objects.AddOrUpdate(new ClientObject { ObjectId = Self, Type = ItemType.Creature });
        // No PropertyInt.HousePurchaseTimestamp set — absent reads as 0,
        // matching a fresh character that has never purchased or abandoned
        // a house. HasPurchaseWaitPeriodExpired(0) is trivially true.
        var house = new RuntimeHouseState(objects);

        house.ApplyHouseStatus(weenieError: 0u, Self);

        Assert.True(house.HasReceivedNotice);
        Assert.Equal(["You may buy another house immediately."], house.Lines);
    }

    [Fact]
    public void HouseStatus_WeenieErrorValueIsDiscarded()
    {
        // Decomp-confirmed: gmHouseUI::Update(uint32_t)/gmMapUI::
        // RecvNotice_FailedHouseTransaction never read their arg2. The
        // rendered text must not depend on the wire WeenieError value.
        var objects = new ClientObjectTable();
        objects.AddOrUpdate(new ClientObject { ObjectId = Self, Type = ItemType.Creature });
        var houseA = new RuntimeHouseState(objects);
        var houseB = new RuntimeHouseState(objects);

        houseA.ApplyHouseStatus(weenieError: 0u, Self);
        houseB.ApplyHouseStatus(weenieError: 0x45Fu /* HouseEvicted */, Self);

        Assert.Equal(houseA.Lines, houseB.Lines);
    }

    [Fact]
    public void HouseData_OwnedHouseWithExpiredWaitPeriod_ShowsAbandonFirstLine()
    {
        var objects = new ClientObjectTable();
        objects.AddOrUpdate(new ClientObject { ObjectId = Self, Type = ItemType.Creature });
        var house = new RuntimeHouseState(objects);

        house.ApplyHouseData(SampleHouseData(), Self);

        Assert.Equal(
            ["You may buy another house immediately after you abandon this one."],
            house.Lines);
    }

    [Fact]
    public void HouseStatus_TimestampWithinThirtyDayWindow_RendersNoLine()
    {
        // HouseSystem::HasPurchaseWaitPeriodExpired: (now - timestamp) >
        // 0x278d00 (2,592,000 s = 30 days). Inside the window, retail takes
        // the strftime-formatted branch this session leaves unported
        // (ISSUES #413 item 2) — must render nothing, not a guess.
        var clock = new ManualTimeProvider();
        var objects = new ClientObjectTable();
        objects.AddOrUpdate(new ClientObject { ObjectId = Self, Type = ItemType.Creature });
        var bundle = new PropertyBundle();
        bundle.Ints[(uint)PropertyInt.HousePurchaseTimestamp] =
            (int)clock.GetUtcNow().ToUnixTimeSeconds();
        objects.UpsertProperties(Self, bundle);
        var house = new RuntimeHouseState(objects, clock);

        clock.Advance(TimeSpan.FromDays(29));
        house.ApplyHouseStatus(weenieError: 0u, Self);

        Assert.Empty(house.Lines);
    }

    [Fact]
    public void HouseStatus_TimestampPastThirtyDayWindow_ShowsBuyImmediatelyLine()
    {
        var clock = new ManualTimeProvider();
        var objects = new ClientObjectTable();
        objects.AddOrUpdate(new ClientObject { ObjectId = Self, Type = ItemType.Creature });
        var bundle = new PropertyBundle();
        bundle.Ints[(uint)PropertyInt.HousePurchaseTimestamp] =
            (int)clock.GetUtcNow().ToUnixTimeSeconds();
        objects.UpsertProperties(Self, bundle);
        var house = new RuntimeHouseState(objects, clock);

        clock.Advance(TimeSpan.FromDays(31));
        house.ApplyHouseStatus(weenieError: 0u, Self);

        Assert.Equal(["You may buy another house immediately."], house.Lines);
    }

    [Fact]
    public void ResetSession_RestoresGenuinelyEmptyPreNoticeState()
    {
        var objects = new ClientObjectTable();
        objects.AddOrUpdate(new ClientObject { ObjectId = Self, Type = ItemType.Creature });
        var house = new RuntimeHouseState(objects);
        house.ApplyHouseStatus(weenieError: 0u, Self);
        Assert.NotEmpty(house.Lines);

        house.ResetSession();

        Assert.Empty(house.Lines);
        Assert.False(house.HasReceivedNotice);
    }

    [Fact]
    public void MissingObjectTable_DefaultsTimestampToZero()
    {
        // Bare-fixture callers (no ClientObjectTable) must not throw — the
        // same optional-borrow discipline RuntimeTradeState uses.
        var house = new RuntimeHouseState();

        house.ApplyHouseStatus(weenieError: 0u, Self);

        Assert.Equal(["You may buy another house immediately."], house.Lines);
    }

    private static GameEvents.HouseData SampleHouseData() => new(
        BuyTime: 0u,
        RentTime: 0u,
        Type: 0u,
        MaintenanceFree: false,
        Buy: Array.Empty<GameEvents.HousePayment>(),
        Rent: Array.Empty<GameEvents.HousePayment>(),
        Position: new CreateObject.ServerPosition(0u, 0f, 0f, 0f, 1f, 0f, 0f, 0f));

    private sealed class ManualTimeProvider : TimeProvider
    {
        private DateTimeOffset _now = new(2026, 8, 17, 0, 0, 0, TimeSpan.Zero);

        public override DateTimeOffset GetUtcNow() => _now;

        public void Advance(TimeSpan elapsed) => _now += elapsed;
    }
}