using System.Linq;
using AcDream.App.UI;
using AcDream.App.UI.Layout;
using AcDream.Core.Net.Messages;
using AcDream.Core.World;

namespace AcDream.App.Tests.UI.Layout;

/// <summary>
/// Controller-level tests for <see cref="MapHousePanelController"/> against
/// the committed <c>map_house_2100006E_1000018C.json</c> fixture (Batch C,
/// overnight hover/UI round) — the SAME <c>LayoutImporter.ImportInfos(dats,
/// 0x2100006Eu, 0x1000018Cu)</c> catalog import
/// <see cref="RetailUiRuntime.MountMapHousePanel"/> performs against real
/// DATs. No DAT access, no live runtime — dat-free per the established
/// <see cref="FixtureLoader"/> pattern.
/// </summary>
public sealed class MapHousePanelControllerTests
{
    /// <summary>Serves BOTH the town-hotspot template (any (layoutId,
    /// elementId) pair not the player/house icon ids) and the two icons
    /// <see cref="MapPageController.Bind"/> re-resolves standalone
    /// (<c>m_pMap</c>'s own button-swallowed children) — a real
    /// <see cref="RowTemplateResolver"/> would set <c>DatElementId</c> the
    /// same way <see cref="LayoutImporter.Build"/> does, so tests that need
    /// to find these icons back by id after the fact need it too.</summary>
    private static UiElement? FakeHotspotTemplate(uint layoutId, uint elementId)
        => new UiText { Width = 10f, Height = 10f, DatElementId = elementId };

    private static MapHousePanelController.Callbacks MakeCallbacks(
        List<string>? calls = null,
        Func<DerethDateTime.Calendar>? currentCalendar = null,
        Func<uint>? playerCellId = null,
        Func<CreateObject.ServerPosition?>? housePosition = null,
        Func<IReadOnlyList<string>>? houseLines = null)
    {
        calls ??= new List<string>();
        return new MapHousePanelController.Callbacks(
            Toggle: () => calls.Add("toggle"),
            Map: new MapPageController.Bindings(
                CurrentCalendar: currentCalendar ?? (static () => default),
                PlayerCellId: playerCellId ?? (static () => 0u),
                HousePosition: housePosition ?? (static () => null),
                TemplateResolver: FakeHotspotTemplate),
            House: new HousePageController.Bindings(
                Lines: houseLines ?? (static () => Array.Empty<string>()),
                OnShown: () => calls.Add("house-shown")));
    }

    [Fact]
    public void Bind_RootBuildsAsUiTabPanel()
    {
        ElementInfo rootInfo = FixtureLoader.LoadMapHouseHostInfos();
        ImportedLayout layout = FixtureLoader.LoadMapHouseHost();

        MapHousePanelController? controller =
            MapHousePanelController.Bind(rootInfo, layout, MakeCallbacks());

        Assert.NotNull(controller);
        Assert.IsType<UiTabPanel>(controller!.Root);
    }

    /// <summary>Pins the authored tab table exactly as read from the live
    /// DATs (<c>MapHousePanelSlotProbeTests</c>): two entries, Map is the
    /// sole default.</summary>
    [Fact]
    public void TabTable_MatchesLiveDatPairing_MapIsDefault()
    {
        ImportedLayout layout = FixtureLoader.LoadMapHouseHost();
        var tabs = Assert.IsType<UiTabPanel>(layout.Root);

        Assert.Equal(2, tabs.Tabs.Count);
        Assert.Contains(tabs.Tabs, e =>
            e.ButtonElementId == 0x100001F3u && e.PageElementId == 0x100001F6u && e.IsDefault);
        Assert.Contains(tabs.Tabs, e =>
            e.ButtonElementId == 0x100001F4u && e.PageElementId == 0x100001F7u && !e.IsDefault);
        Assert.Single(tabs.Tabs, e => e.IsDefault);
    }

    [Fact]
    public void Bind_Succeeds_AndActivateTabs_SelectsMapByDefault()
    {
        ElementInfo rootInfo = FixtureLoader.LoadMapHouseHostInfos();
        ImportedLayout layout = FixtureLoader.LoadMapHouseHost();
        MapHousePanelController? controller =
            MapHousePanelController.Bind(rootInfo, layout, MakeCallbacks());

        Assert.NotNull(controller);
        controller!.ActivateTabs();

        Assert.Empty(controller.TabPanel.UnresolvedEntries);
        Assert.False(controller.IsShowingHouse);
    }

    [Fact]
    public void SwitchToHouse_FiresOnShown_OnlyWhenPanelIsVisible()
    {
        ElementInfo rootInfo = FixtureLoader.LoadMapHouseHostInfos();
        ImportedLayout layout = FixtureLoader.LoadMapHouseHost();
        var calls = new List<string>();
        MapHousePanelController? controller =
            MapHousePanelController.Bind(rootInfo, layout, MakeCallbacks(calls));
        Assert.NotNull(controller);
        controller!.ActivateTabs();

        // Not visible yet: switching tabs must not fire OnShown.
        controller.TabPanel.SwitchTo(0x100001F7u);
        Assert.DoesNotContain("house-shown", calls);

        controller.OnShown();
        Assert.Contains("house-shown", calls);
    }

    [Fact]
    public void CloseButton_InvokesToggle()
    {
        ElementInfo rootInfo = FixtureLoader.LoadMapHouseHostInfos();
        ImportedLayout layout = FixtureLoader.LoadMapHouseHost();
        var calls = new List<string>();
        MapHousePanelController? controller =
            MapHousePanelController.Bind(rootInfo, layout, MakeCallbacks(calls));
        Assert.NotNull(controller);

        UiElement? close = layout.FindElement(0x100001F5u);
        Assert.IsType<UiButton>(close);
        ((UiButton)close!).OnClick?.Invoke();

        Assert.Contains("toggle", calls);
    }

    [Fact]
    public void Bind_BuildsAll53TownHotspots_UnderTheMapWidget()
    {
        ElementInfo rootInfo = FixtureLoader.LoadMapHouseHostInfos();
        ImportedLayout layout = FixtureLoader.LoadMapHouseHost();
        MapHousePanelController? controller =
            MapHousePanelController.Bind(rootInfo, layout, MakeCallbacks());
        Assert.NotNull(controller);

        UiElement? map = UiElement.FindDescendant(controller!.Root, MapPageController.MapWidgetId);
        Assert.NotNull(map);
        // m_pMap's own children are the player/house icons (re-resolved
        // standalone — see MapPageController.Bind's doc on why m_pMap being
        // a Button swallows its authored nested children) PLUS the 53 town
        // hotspots.
        var townMarkers = map!.Children
            .Where(c => c.DatElementId != MapPageController.PlayerIconId
                && c.DatElementId != MapPageController.HouseIconId)
            .ToList();
        Assert.Equal(55, map.Children.Count);
        Assert.Equal(53, townMarkers.Count);
        Assert.All(townMarkers, c => Assert.Contains(
            MapLocations.All, loc => loc.Width == c.Width && loc.Height == c.Height));
        Assert.All(townMarkers, c => Assert.True(c.AuthoredTooltipEnabled));
        Assert.Contains(townMarkers, c => c.AuthoredTooltipText == "Holtburg");
    }

    [Fact]
    public void Bind_HouseListBoxStartsEmpty_MatchingRetailPostInit()
    {
        ElementInfo rootInfo = FixtureLoader.LoadMapHouseHostInfos();
        ImportedLayout layout = FixtureLoader.LoadMapHouseHost();
        MapHousePanelController? controller =
            MapHousePanelController.Bind(rootInfo, layout, MakeCallbacks());
        Assert.NotNull(controller);

        UiElement? box = UiElement.FindDescendant(controller!.Root, HousePageController.TextBoxId);
        var listBox = Assert.IsType<UiTemplateListBox>(box);
        Assert.Equal(0, listBox.ContentHeight);
    }
}