using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using AcDream.App.UI;
using AcDream.App.UI.Layout;
using AcDream.Content;
using DatReaderWriter;
using DatReaderWriter.DBObjs;
using DatReaderWriter.Options;

namespace AcDream.App.Tests.UI.Layout;

/// <summary>
/// #409 (client-wide retail tooltip system) installed-DAT acceptance gate.
/// Opt in with <c>ACDREAM_PROBE_LIVE_MOUNT=1</c>; <c>ACDREAM_DAT_DIR</c> can
/// override the ordinary Documents/Asheron's Call location. Pins retail's
/// tooltip popup LayoutDesc <c>0x21000041</c> structure and a client-wide
/// sweep landmark, mirroring <see cref="CharacterManagementLiveDatTests"/>'s
/// pattern.
/// </summary>
public sealed class TooltipLiveDatTests
{
    private static string DatDirectory =>
        System.Environment.GetEnvironmentVariable("ACDREAM_DAT_DIR")
        ?? Path.Combine(
            System.Environment.GetFolderPath(System.Environment.SpecialFolder.UserProfile),
            "Documents",
            "Asheron's Call");

    /// <summary>The tooltip popup catalog LayoutDesc — every probed
    /// tooltip-bearing element's P0x48 resolves here (with one exception,
    /// 0x21000026, an alternate skin used by a handful of elements —
    /// RetailTooltipPresenter is data-driven off each element's OWN P0x48
    /// so neither this constant nor 0x21000026 is hardcoded in production
    /// code; it is cited here only to pin the probe's own finding).</summary>
    private const uint TooltipCatalogLayoutId = 0x21000041u;

    /// <summary>The four popup "skin" root element ids live-DAT-probed inside
    /// <see cref="TooltipCatalogLayoutId"/>. Each is a 30x30 four-piece bevel
    /// frame around the SAME text child id (<see cref="TooltipTextChildId"/>).</summary>
    private static readonly uint[] PopupSkinRootIds =
        [0x10000487u, 0x10000395u, 0x10000397u, 0x10000398u];

    private const uint TooltipTextChildId = 0x10000396u;

    [InstalledDatFact]
    public void TooltipCatalog_EveryPopupSkin_SharesTheSameTextChild()
    {
        using var dats = new DatCollection(DatDirectory, DatAccessType.Read);

        ElementInfo? root = LayoutImporter.ImportInfos(dats, TooltipCatalogLayoutId);
        Assert.NotNull(root);
        Assert.Equal(0u, root!.Id);
        Assert.Equal(800f, root.Width);
        Assert.Equal(600f, root.Height);

        foreach (uint skinRootId in PopupSkinRootIds)
        {
            ElementInfo skin = Assert.Single(root.Children, c => c.Id == skinRootId);
            // UIElementManager::StartTooltip @0x0045DE90's own fallback read:
            // GetAttribute_Enum(tooltipRootElement, 0x4a, &textChildId) off the
            // freshly-instantiated POPUP root itself.
            Assert.Equal(TooltipTextChildId, skin.TooltipTextChildElementId);

            ElementInfo textChild = Assert.Single(
                AllDescendants(skin), e => e.Id == TooltipTextChildId);
            Assert.Equal(12u, textChild.Type); // UIElement_Text
        }
    }

    [InstalledDatFact]
    public void TooltipCatalog_ImportsThroughLayoutImporter_WithTextChildResolvable()
    {
        using var dats = new DatCollection(DatDirectory, DatAccessType.Read);

        ImportedLayout? popup = LayoutImporter.Import(
            dats,
            TooltipCatalogLayoutId,
            0x10000487u,
            _ => (0u, 0, 0),
            null);
        Assert.NotNull(popup);
        Assert.Equal(30f, popup!.Root.Width);
        Assert.Equal(30f, popup.Root.Height);
        Assert.Equal(TooltipTextChildId, popup.Root.AuthoredTooltipTextChildElementId);

        UiElement? textChild = popup.FindElement(TooltipTextChildId);
        Assert.IsType<UiText>(textChild);
    }

    /// <summary>
    /// A known tooltip-bearing element (the Appearance page's left rotate
    /// button, live-DAT-probed) authors all five trigger properties with
    /// literal StringInfo text — the "core" case
    /// <see cref="RetailTooltipPresenter"/> can show end to end.
    /// </summary>
    [InstalledDatFact]
    public void KnownElement_AuthorsAllFiveTooltipProperties_WithResolvableText()
    {
        using var dats = new DatCollection(DatDirectory, DatAccessType.Read);

        ElementInfo? tree = LayoutImporter.ImportInfos(dats, 0x21000005u);
        Assert.NotNull(tree);
        ElementInfo rotateLeft = Assert.Single(AllDescendants(tree!), e => e.Id == 0x100005A4u);

        Assert.True(rotateLeft.TooltipEnabled);
        Assert.Equal(0x10000487u, rotateLeft.TooltipRootElementId);
        Assert.Equal(TooltipCatalogLayoutId, rotateLeft.TooltipLayoutDid);
        Assert.NotNull(rotateLeft.TooltipText);

        var strings = new DatStringResolver(dats);
        string? resolved = DatWidgetFactory.ResolveTooltipText(rotateLeft, strings.Resolve);
        Assert.Equal("Rotate left.", resolved);
    }

    /// <summary>
    /// Landmark client-wide sweep (mirrors
    /// <see cref="LayoutImporterMediaBearingChildSweepTests"/>'s own shape):
    /// every installed LayoutDesc, counting elements authoring at least one
    /// of the five tooltip-trigger properties. Asserts landmarks + a floor,
    /// not a brittle exact total, so the gate survives a future DAT
    /// revision.
    /// </summary>
    [InstalledDatFact]
    public void ClientWideSweep_FindsKnownLandmarksAndAFloorCount()
    {
        using var dats = new DatCollection(DatDirectory, DatAccessType.Read);

        var withProperties = new List<(uint LayoutId, uint ElementId, bool HasText, bool Showable)>();
        foreach (uint layoutId in dats.GetAllIdsOfType<LayoutDesc>())
        {
            ElementInfo? tree;
            try { tree = LayoutImporter.ImportInfos(dats, layoutId); }
            catch { continue; }
            if (tree is null) continue;

            foreach (ElementInfo e in AllDescendants(tree))
            {
                bool any = e.TooltipRootElementId != 0 || e.TooltipLayoutDid != 0
                    || e.TooltipText.HasValue || e.TooltipEnabled
                    || e.TooltipDelaySeconds.HasValue;
                if (any)
                {
                    // F9 (2026-08-16 review round): "with literal text" alone
                    // over-counts what RetailTooltipPresenter.OnTooltipShow
                    // actually shows — that gate is a FULL AND across
                    // TooltipEnabled (P0x4B) AND non-null text (P0x49) AND
                    // both popup-locator ids (P0x47/P0x48), not just text
                    // presence. Measure the real intersection instead of
                    // assuming "243 with text" == "243 showable".
                    bool showable = e.TooltipEnabled && e.TooltipText.HasValue
                        && e.TooltipLayoutDid != 0 && e.TooltipRootElementId != 0;
                    withProperties.Add((layoutId, e.Id, e.TooltipText.HasValue, showable));
                }
            }
        }

        Console.WriteLine($"[409-DAT] {withProperties.Count} elements author >=1 tooltip property "
            + $"({withProperties.Count(f => f.HasText)} with literal StringInfo text, "
            + $"{withProperties.Count(f => f.Showable)} pass the full OnTooltipShow gate).");

        // #409 investigation landmark (main game UI, Appearance rotate button).
        Assert.Contains(withProperties, f => f.LayoutId == 0x21000005u && f.ElementId == 0x100005A4u);
        // Floor: the live-DAT sweep found 430 total / 243 with literal text /
        // 243 fully showable (2026-08-16, both post-F9 measurements) —
        // assert comfortably below all three so a future content patch that
        // only ADDS tooltip authoring cannot flake this gate.
        Assert.True(withProperties.Count >= 400,
            $"expected at least 400 tooltip-property-authoring elements, found {withProperties.Count}.");
        Assert.True(withProperties.Count(f => f.HasText) >= 200,
            $"expected at least 200 elements with literal tooltip text, found {withProperties.Count(f => f.HasText)}.");
        Assert.True(withProperties.Count(f => f.Showable) >= 200,
            $"expected at least 200 fully showable elements, found {withProperties.Count(f => f.Showable)}.");
    }

    /// <summary>
    /// #409 live-failure round, the pin that protects the runtime-text fix.
    /// The Options panel's authored toggle-row TEMPLATE (LayoutDesc
    /// <c>0x2100002B</c>, row root <c>0x10000218</c>, checkbox leaf
    /// <c>0x10000219</c>) carries the full tooltip POPUP LOCATOR
    /// (<c>P0x47</c>/<c>P0x48</c>) and the <c>P0x4B</c> on-bit, but authors NO
    /// <c>P0x49</c> text — its help string arrives at runtime, exactly as
    /// retail's <c>UIOption_CheckboxBitfield64::CreateChildren @0x00485E65</c>
    /// stamps its <c>siTooltip</c> array. This is why reading only
    /// <c>AuthoredTooltipText</c> showed nothing anywhere in-world; see
    /// <c>RetailTooltipPresenter.ResolveTooltipText</c>.
    ///
    /// <para>The row template is template-list referenced, so
    /// <see cref="LayoutImporter.ImportInfos"/>'s client-wide walk deliberately
    /// filters it out (#375) — it has to be imported by its own root id.</para>
    /// </summary>
    [InstalledDatFact]
    public void OptionsToggleRowTemplate_AuthorsThePopupLocatorButNoLiteralText()
    {
        using var dats = new DatCollection(DatDirectory, DatAccessType.Read);

        ImportedLayout? row = LayoutImporter.Import(
            dats, OptionsPanelLayoutId, OptionsToggleRowTemplateId, _ => (0u, 0, 0), null);
        Assert.NotNull(row);

        UiElement checkbox = Assert.Single(
            AllWidgets(row!.Root), w => w.DatElementId == OptionsToggleCheckboxId);

        Assert.Equal(0x10000397u, checkbox.AuthoredTooltipRootElementId);   // P0x47
        Assert.Equal(TooltipCatalogLayoutId, checkbox.AuthoredTooltipLayoutDid); // P0x48
        Assert.True(checkbox.AuthoredTooltipEnabled);                        // P0x4B
        Assert.True(string.IsNullOrEmpty(checkbox.AuthoredTooltipText));     // no P0x49
        // ...and it is a real hover target, so UiRoot.UpdateHover can select it.
        Assert.False(checkbox.ClickThrough);
        // StartTooltipAtMouse @0x00460E7E's fallback source, stamped by the
        // importer's dat shell.
        Assert.Equal(OptionsPanelLayoutId, checkbox.SourceLayoutDid);
    }

    private const uint OptionsPanelLayoutId = 0x2100002Bu;
    private const uint OptionsToggleRowTemplateId = 0x10000218u;
    private const uint OptionsToggleCheckboxId = 0x10000219u;

    /// <summary>Retail's <c>UIElement_UIItem</c> registered class id
    /// (<c>UIElement_UIItem::Register @0x0047A488</c>:
    /// <c>RegisterElementClass(0x10000032, ...)</c>). The catalog also holds a
    /// handful of type-3 (plain UIRegion) housekeeping elements used only as
    /// BaseElement bases for the real prototypes below — never selected by any
    /// list's own cell-template attribute, so they are excluded from this
    /// scan.</summary>
    private const uint UiItemElementType = 0x10000032u;

    /// <summary>
    /// Item-tooltip investigation (docs/ISSUES.md #409 follow-on): pins the
    /// finding that justifies <c>UiItemSlot</c> hardcoding a single popup-
    /// locator pair rather than reading it per prototype. Every standalone
    /// UIItem prototype (type <c>0x10000032</c>) in the shared cell-template
    /// catalog (<see cref="ItemListCellTemplate.CatalogLayoutId"/>, LayoutDesc
    /// <c>0x21000037</c>) resolves the SAME <c>P0x47/P0x48</c> pair through
    /// catalog inheritance — <c>0x10000395</c> within <c>0x21000041</c>, one of
    /// the four popup skins <see cref="TooltipCatalog_EveryPopupSkin_SharesTheSameTextChild"/>
    /// already pins. None author literal <c>P0x49</c> text or the <c>P0x4B</c>
    /// on-bit — matching retail's runtime-text game-code sites
    /// (<c>UIElement_UIItem::UpdateTooltip @0x004E1CB0</c> sets both the text
    /// and the on-bit itself; see <see cref="RetailTooltipPresenter.OnTooltipShow"/>'s
    /// <c>fromRuntime</c> bypass).
    /// </summary>
    [InstalledDatFact]
    public void UiItemCatalog_EveryPrototype_SharesTheSamePopupLocator()
    {
        using var dats = new DatCollection(DatDirectory, DatAccessType.Read);

        ElementInfo? catalog = LayoutImporter.ImportInfos(dats, ItemListCellTemplate.CatalogLayoutId);
        Assert.NotNull(catalog);
        Assert.True(catalog!.Children.Count >= 40,
            $"expected the shared UIItem catalog to hold dozens of prototypes, found {catalog.Children.Count}.");

        var prototypes = catalog.Children.Where(c => c.Type == UiItemElementType).ToList();
        Assert.True(prototypes.Count >= 30,
            $"expected the shared UIItem catalog to hold dozens of type-0x10000032 prototypes, found {prototypes.Count}.");

        foreach (ElementInfo prototype in prototypes)
        {
            Assert.True(prototype.TooltipRootElementId == UiItemTooltipRootElementId,
                $"prototype 0x{prototype.Id:X8} authors P0x47=0x{prototype.TooltipRootElementId:X8}, expected 0x{UiItemTooltipRootElementId:X8}.");
            Assert.True(prototype.TooltipLayoutDid == TooltipCatalogLayoutId,
                $"prototype 0x{prototype.Id:X8} authors P0x48=0x{prototype.TooltipLayoutDid:X8}, expected 0x{TooltipCatalogLayoutId:X8}.");
            Assert.False(prototype.TooltipText.HasValue,
                $"prototype 0x{prototype.Id:X8} unexpectedly authors literal P0x49 tooltip text.");
        }

        // Concrete owning lists select DIFFERENT prototype ids (attribute
        // 0x1000000E) for their own cell shape, but every one of those
        // prototypes still resolves the same popup locator above — so
        // UiItemSlot's hardcoded pair is correct regardless of which list
        // spawned the cell.
        ElementInfo? inventoryTree = LayoutImporter.ImportInfos(dats, 0x21000023u);
        ElementInfo? contentsGrid = inventoryTree is null
            ? null : AllDescendants(inventoryTree).FirstOrDefault(x => x.Id == 0x100001C6u);
        Assert.NotNull(contentsGrid);
        Assert.True(contentsGrid!.TryGetEffectiveProperty(0x1000000Eu, out UiPropertyValue protoProp));
        Assert.NotEqual(0u, (uint)protoProp.UnsignedValue);

        ElementInfo? toolbarTree = LayoutImporter.ImportInfos(dats, 0x21000016u);
        ElementInfo? toolbarSlot = toolbarTree is null
            ? null : AllDescendants(toolbarTree).FirstOrDefault(x => x.Id == 0x100001A7u);
        Assert.NotNull(toolbarSlot);
        Assert.True(toolbarSlot!.TryGetEffectiveProperty(0x1000000Eu, out UiPropertyValue toolbarProtoProp));
        Assert.NotEqual(0u, (uint)toolbarProtoProp.UnsignedValue);
        // Different lists really do select different prototypes.
        Assert.NotEqual((uint)protoProp.UnsignedValue, (uint)toolbarProtoProp.UnsignedValue);
    }

    /// <summary>
    /// World-object tooltip investigation (docs/ISSUES.md #409 follow-on).
    /// <c>UIElement_SmartBoxWrapper</c> (retail's registered class
    /// <c>0x10000030</c>, <c>UIElement_SmartBoxWrapper::Register @0x0047A47E</c>)
    /// is the caller of the world-hover tooltip's own
    /// <c>UIElement::SetTooltip</c>/<c>StartTooltipAtMouse</c> pair
    /// (<c>RecvNotice_SmartBoxObjectFound @0x004E5AD0</c>, calls at
    /// <c>@0x004E5D74</c>/<c>@0x004E5DFB</c>) — but this exhaustive sweep of
    /// every installed <c>LayoutDesc</c> found ZERO elements of that type
    /// anywhere. Unlike the UIItem catalog (49 standalone template
    /// prototypes, all authoring the SAME popup locator), the 3D-viewport
    /// wrapper is evidently constructed directly by game code
    /// (<c>gmGamePlayUI</c>'s own mode setup) rather than from a walkable
    /// authored <c>ElementDesc</c>, so its own <c>P0x47</c>/<c>P0x48</c>
    /// cannot be read from the DAT the way every other tooltip trigger's
    /// can. <see cref="RetailTooltipPresenter"/>'s world-hover popup therefore
    /// REUSES the item-catalog's confirmed uniform pair
    /// (<c>P0x47=0x10000395</c>/<c>P0x48=0x21000041</c>) — the SAME "generic
    /// runtime-text" skin every other game-code <c>SetTooltip</c> caller in
    /// this family (items, the Options checkboxes, the radar) draws from —
    /// as the best-evidenced inference rather than leaving world-object
    /// tooltips unimplemented over one unrecoverable hex constant.
    /// </summary>
    [InstalledDatFact]
    public void SmartBoxWrapper_HasNoAuthoredElementDesc_AnywhereInstalled()
    {
        using var dats = new DatCollection(DatDirectory, DatAccessType.Read);

        int found = 0;
        foreach (uint layoutId in dats.GetAllIdsOfType<LayoutDesc>())
        {
            ElementInfo? tree;
            try { tree = LayoutImporter.ImportInfos(dats, layoutId); }
            catch { continue; }
            if (tree is null) continue;

            found += AllDescendants(tree).Count(e => e.Type == SmartBoxWrapperElementType);
        }

        Assert.Equal(0, found);
    }

    /// <summary>Retail's <c>UIElement_SmartBoxWrapper</c> registered class id.</summary>
    private const uint SmartBoxWrapperElementType = 0x10000030u;

    /// <summary>The item-cell popup-locator P0x47, hardcoded onto every
    /// <see cref="UiItemSlot"/> — see that class's own doc comment.</summary>
    private const uint UiItemTooltipRootElementId = 0x10000395u;

    private static IEnumerable<UiElement> AllWidgets(UiElement root)
    {
        yield return root;
        foreach (UiElement child in root.Children)
            foreach (UiElement descendant in AllWidgets(child))
                yield return descendant;
    }

    private static IEnumerable<ElementInfo> AllDescendants(ElementInfo root)
    {
        yield return root;
        foreach (ElementInfo child in root.Children)
            foreach (ElementInfo descendant in AllDescendants(child))
                yield return descendant;
    }
}