using Godot;
using Theriapolis.Core.Data;
using Theriapolis.GodotHost.UI;

namespace Theriapolis.GodotHost.Scenes.Steps;

/// <summary>
/// Step I — Clade. Direct port of <c>StepClade</c> in
/// <c>src/steps.jsx</c>: intro paragraph, then a card grid with one
/// card per clade. Click selects via <see cref="CharacterDraft.Patch"/>.
///
/// Default theme only at this layer (per GODOT_PORTING_GUIDE.md §12 build
/// order); the parchment look lands in the final theming pass.
/// </summary>
public partial class StepClade : VBoxContainer, IStep
{
    private CharacterDraft _draft = null!;
    private GridContainer _grid = null!;

    public void Bind(CharacterDraft draft)
    {
        _draft = draft;
        _draft.Changed += Refresh;
        Build();
    }

    public string? Validate() => string.IsNullOrEmpty(_draft?.CladeId) ? "Pick a clade." : null;

    private void Build()
    {
        AddThemeConstantOverride("separation", 16);

        var intro = new VBoxContainer();
        intro.AddThemeConstantOverride("separation", 6);
        AddChild(intro);
        intro.AddChild(new Label { Text = "FOLIO I · CLADE" });
        intro.AddChild(new Label { Text = "Choose a Clade" });
        intro.AddChild(new Label
        {
            Text = "The broad mammalian family of your line. Clade defines the largest "
                 + "strokes — predator or prey, communal or solitary, scent-driven or "
                 + "sight-driven. Each clade carries inherited traits and limits that "
                 + "no character escapes.",
            AutowrapMode = TextServer.AutowrapMode.WordSmart,
            CustomMinimumSize = new Vector2(0, 0),
        });

        _grid = new GridContainer
        {
            Columns = 3,
            SizeFlagsHorizontal = SizeFlags.ExpandFill,
        };
        _grid.AddThemeConstantOverride("h_separation", 16);
        _grid.AddThemeConstantOverride("v_separation", 16);
        AddChild(_grid);

        Refresh();
    }

    private void Refresh()
    {
        if (_grid is null) return;
        foreach (var c in _grid.GetChildren()) c.QueueFree();
        foreach (var clade in CodexContent.Clades)
            _grid.AddChild(BuildCard(clade));
    }

    private Control BuildCard(CladeDef clade)
    {
        bool selected = _draft.CladeId == clade.Id;

        var btn = new Button
        {
            Text = "",
            Flat = false,
            ToggleMode = true,
            ButtonPressed = selected,
            FocusMode = Control.FocusModeEnum.None,
            // 200 wide so 3 cards + separators (≈ 632) + page margins +
            // Aside fit inside ≥ 1024-px viewports (the smaller-screen
            // floor we want to support). Height held at 200 so the inner
            // labels render at readable size without a content-driven
            // height collapse (Button isn't a Container, so child vbox
            // height doesn't bubble up to the button's intrinsic min size).
            CustomMinimumSize = new Vector2(200, 200),
            ClipText = false,
            Alignment = HorizontalAlignment.Left,
        };
        btn.Pressed += () =>
        {
            // Default species for the new clade — match React app.jsx:
            // when clade changes, species defaults to first species in clade.
            string speciesId = "";
            foreach (var s in CodexContent.SpeciesOfClade(clade.Id))
            {
                speciesId = s.Id;
                break;
            }
            _draft.Patch(new Godot.Collections.Dictionary
            {
                { "clade_id",   clade.Id },
                { "species_id", speciesId },
            });
        };

        // Label content stacked inside the button via an anchored VBoxContainer
        // (Button isn't a Container, so we anchor the vbox to fill the button's
        // rect and let the children flow within it).
        var box = new VBoxContainer
        {
            MouseFilter = MouseFilterEnum.Ignore,
        };
        box.AnchorRight = 1f;
        box.AnchorBottom = 1f;
        box.OffsetLeft = 12;
        box.OffsetTop = 12;
        box.OffsetRight = -12;
        box.OffsetBottom = -12;
        box.AddThemeConstantOverride("separation", 6);
        btn.AddChild(box);

        box.AddChild(new Label { Text = clade.Name, MouseFilter = MouseFilterEnum.Ignore });
        box.AddChild(new Label
        {
            Text = clade.Kind.ToUpperInvariant(),
            MouseFilter = MouseFilterEnum.Ignore,
        });

        if (clade.AbilityMods.Count > 0)
        {
            var modsRow = new HBoxContainer { MouseFilter = MouseFilterEnum.Ignore };
            modsRow.AddThemeConstantOverride("separation", 8);
            box.AddChild(modsRow);
            foreach (var (k, v) in clade.AbilityMods)
                modsRow.AddChild(new Label
                {
                    Text = $"{k} {(v >= 0 ? "+" : "")}{v}",
                    MouseFilter = MouseFilterEnum.Ignore,
                });
        }

        if (clade.Traits.Length > 0)
        {
            box.AddChild(new Label
            {
                Text = $"{clade.Traits.Length} traits, {clade.Detriments.Length} detriments",
                MouseFilter = MouseFilterEnum.Ignore,
            });
        }

        return btn;
    }
}