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_ShowsExpiryDateLine()
    {
        // HouseSystem::HasPurchaseWaitPeriodExpired: (now - timestamp) >
        // 0x278d00 (2,592,000 s = 30 days). Inside the window, retail's
        // gmHouseUI::DisplayPurchaseTimeText composes prefix + strftime("%c")
        // of (timestamp + 30 days) + suffix (night-round review F8 — the
        // "unrecoverable strftime branch" from ISSUES #413 item 2 was
        // byte-decoded and is now ported). The exact date substring is
        // locale/timezone-formatted (.NET's honest %c analogue), so this
        // pins the STRUCTURE (prefix/suffix, non-empty middle), not the
        // exact rendered date text.
        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);

        string line = Assert.Single(house.Lines);
        Assert.StartsWith("You may buy another landscape house at ", line);
        Assert.EndsWith(". This restriction does not apply to apartments.", line);
    }

    [Fact]
    public void HouseStatus_TimestampWithinThirtyDayWindow_ExpiryDateIsTimestampPlusThirtyDays()
    {
        // Pins the actual computed expiry moment (retail: timestamp +
        // 0x278d00 = 2,592,000 s, formatted via localtime — this fixture's
        // LocalTimeZone is UTC, so the rendered date is exactly the UTC
        // expiry instant with no offset ambiguity).
        var clock = new ManualTimeProvider();
        var objects = new ClientObjectTable();
        objects.AddOrUpdate(new ClientObject { ObjectId = Self, Type = ItemType.Creature });
        DateTimeOffset purchaseTime = clock.GetUtcNow();
        var bundle = new PropertyBundle();
        bundle.Ints[(uint)PropertyInt.HousePurchaseTimestamp] =
            (int)purchaseTime.ToUnixTimeSeconds();
        objects.UpsertProperties(Self, bundle);
        var house = new RuntimeHouseState(objects, clock);

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

        DateTime expectedExpiry = purchaseTime.AddSeconds(0x278d00).UtcDateTime;
        string line = Assert.Single(house.Lines);
        Assert.Contains(expectedExpiry.ToString(System.Globalization.CultureInfo.CurrentCulture), line);
    }

    [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;

        // F8: pin LocalTimeZone to UTC so the not-yet-expired branch's
        // TimeZoneInfo.ConvertTime call is deterministic across machines —
        // the real production TimeProvider.System.LocalTimeZone is
        // TimeZoneInfo.Local, matching retail's own localtime() call.
        public override TimeZoneInfo LocalTimeZone => TimeZoneInfo.Utc;

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