using System;

namespace AcDream.App.UI.Layout;

/// <summary>
/// Mounts retail's two-tab Map/House panel — LayoutDesc <c>0x2100006E</c>
/// slot <c>0x1000018C</c>, <see cref="AcDream.App.UI.RetailPanelCatalog"/>
/// id <b>16</b>. Batch C (overnight hover/UI round, 2026-08-17), built on
/// the <see cref="SocialPanelController"/>/<see cref="OptionsPanelController"/>
/// recipe (Type-8 tab host, <see cref="UiTabPanel.ActivateTabBehavior"/>,
/// per-page scoped controllers).
///
/// <para>
/// <b>Slot/panelId/button — resolved, not guessed.</b> The FA campaign's own
/// full 16-slot <c>gmPanelUI::SetupChildren</c> dump
/// (<c>docs/research/2026-08-11-fa-panel-structure.md:927-933</c>) already
/// named slot <c>0x1000018C</c> as "gmMapUI+gmHouseUI pages", panel id 16 —
/// this session's <c>MapHousePanelSlotProbeTests</c> re-confirmed it live.
/// The toolbar button is <c>0x1000019A</c> (own authored
/// <c>P0x10000029 = 16</c>), one of three currently-ghosted panel buttons
/// (see <c>docs/research/2026-08-17-map-house-recon.md</c>).
/// </para>
///
/// <para>
/// <b>Tab table — live-DAT-confirmed.</b>
/// <c>button 0x100001F3 -&gt; page 0x100001F6 (Map, DEFAULT)</c>,
/// <c>button 0x100001F4 -&gt; page 0x100001F7 (House)</c>. The page roots are
/// themselves typed <c>0x10000026</c> (gmMapUI) / <c>0x10000025</c>
/// (gmHouseUI) in the DAT — <see cref="DatWidgetFactory"/> has no special
/// case for either id, so they build as generic containers (same as every
/// other unmodeled retail UI class); <see cref="MapPageController"/> and
/// <see cref="HousePageController"/> find their own signature children by
/// id underneath.
/// </para>
///
/// <para>
/// <b>Close button</b>: <c>0x100001F5</c> (Type 1, top-right at
/// <c>(276,0) 24x25</c>) — same authored position/size as the Social
/// panel's own close button, the established <c>gmPanelUI</c> sibling
/// convention.
/// </para>
/// </summary>
public sealed class MapHousePanelController : IRetainedPanelController
{
    public const uint HostLayoutId = 0x2100006Eu;
    public const uint SlotElementId = 0x1000018Cu;

    private const uint MapButtonId = 0x100001F3u;
    private const uint MapPageId = 0x100001F6u;
    private const uint HouseButtonId = 0x100001F4u;
    private const uint HousePageId = 0x100001F7u;
    private const uint CloseButtonId = 0x100001F5u;

    public sealed record Callbacks(
        Action Toggle,
        MapPageController.Bindings Map,
        HousePageController.Bindings House);

    private readonly UiTabPanel _tabPanel;
    private readonly MapPageController? _map;
    private readonly HousePageController? _house;
    private readonly Action<uint, uint> _onActivePageChanged;
    private bool _visible;
    private bool _disposed;

    public UiElement Root => _tabPanel;
    public UiTabPanel TabPanel => _tabPanel;

    private MapHousePanelController(
        UiTabPanel tabPanel, MapPageController? map, HousePageController? house)
    {
        _tabPanel = tabPanel;
        _map = map;
        _house = house;

        // House's outbound query is a fire-when-shown convenience (see
        // HousePageController.Bindings.OnShown's own doc — not a ported
        // retail trigger, an acdream one), gated the same "window shown AND
        // my tab active" conjunction the social panel's Fellowship/
        // Allegiance pages use for their own declarations.
        _onActivePageChanged = (_, _) => FireHouseShownIfActive();
        _tabPanel.ActivePageChanged += _onActivePageChanged;
    }

    /// <param name="rootInfo">The pre-Build <see cref="ElementInfo"/> tree
    /// <paramref name="layout"/> was built from — <see cref="MapPageController"/>
    /// needs it to read <c>m_pMap</c>'s own authored int/enum attrs, which
    /// only exist on <see cref="ElementInfo"/>, not the built
    /// <see cref="UiElement"/> tree.</param>
    public static MapHousePanelController? Bind(
        ElementInfo rootInfo, ImportedLayout layout, Callbacks callbacks)
    {
        ArgumentNullException.ThrowIfNull(rootInfo);
        ArgumentNullException.ThrowIfNull(layout);
        ArgumentNullException.ThrowIfNull(callbacks);

        if (layout.Root is not UiTabPanel tabPanel)
        {
            Console.WriteLine(
                "[D.2b] MapHousePanelController.Bind: root did not build as UiTabPanel "
                + $"(actual type {layout.Root.GetType().Name}) — Map/House panel will not open.");
            return null;
        }

        if (layout.FindElement(CloseButtonId) is UiButton close)
            close.OnClick = callbacks.Toggle;
        else
            Console.WriteLine(
                $"[D.2b] MapHousePanelController: close button 0x{CloseButtonId:X8} not found.");

        UiElement? mapPage = UiElement.FindDescendant(tabPanel, MapPageId);
        UiElement? housePage = UiElement.FindDescendant(tabPanel, HousePageId);

        MapPageController? map = null;
        if (mapPage is not null)
        {
            ElementInfo? mapPageInfo = FindInfo(rootInfo, MapPageId);
            map = mapPageInfo is null
                ? null
                : MapPageController.Bind(mapPage, mapPageInfo, callbacks.Map);
        }
        HousePageController? house = housePage is null
            ? null
            : HousePageController.Bind(housePage, callbacks.House);

        if (mapPage is null)
            Console.WriteLine($"[D.2b] MapHousePanelController: Map page 0x{MapPageId:X8} not found.");
        if (housePage is null)
            Console.WriteLine($"[D.2b] MapHousePanelController: House page 0x{HousePageId:X8} not found.");

        return new MapHousePanelController(tabPanel, map, house);
    }

    public void ActivateTabs() => _tabPanel.ActivateTabBehavior();

    public bool IsShowingHouse => _tabPanel.ActivePageElementId == HousePageId;

    public void OnShown()
    {
        _visible = true;
        FireHouseShownIfActive();
    }

    public void OnHidden() => _visible = false;

    private void FireHouseShownIfActive()
    {
        if (_visible && IsShowingHouse)
            _house?.OnShown();
    }

    /// <summary>Per-frame poll: Map's 5 s-gated refresh (cheap when not due)
    /// and House's revision-gated row rebuild. Both stay unconditional
    /// (unlike Friends/Squelch's DAT-locked rebuild) — Map's own cadence
    /// gate and House's list compare are both cheap even while hidden.</summary>
    public void Tick(double deltaSeconds)
    {
        if (_disposed) return;
        _map?.Tick(deltaSeconds);
        _house?.Tick();
    }

    public void Dispose()
    {
        if (_disposed) return;
        _disposed = true;
        _tabPanel.ActivePageChanged -= _onActivePageChanged;
    }

    private static ElementInfo? FindInfo(ElementInfo info, uint id)
    {
        if (info.Id == id) return info;
        foreach (ElementInfo child in info.Children)
        {
            ElementInfo? found = FindInfo(child, id);
            if (found is not null) return found;
        }
        return null;
    }
}