using Godot;
using Theriapolis.Core.Data;
using Theriapolis.GodotHost.Scenes.Widgets;
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;

        // PanelContainer (a Container subclass) so the card height is
        // driven by its inner VBoxContainer's content. Switching from
        // Button avoids the issue where Button's intrinsic min size
        // doesn't aggregate from non-Button children, causing chips to
        // overflow into the cards below at high trait counts.
        var card = new PanelContainer
        {
            CustomMinimumSize = new Vector2(200, 0),
            MouseFilter = MouseFilterEnum.Stop,
        };
        if (selected) card.Modulate = new Color(1f, 0.95f, 0.85f);  // gild tint placeholder until theming

        card.GuiInput += (InputEvent e) =>
        {
            if (e is InputEventMouseButton mb && mb.Pressed && mb.ButtonIndex == MouseButton.Left)
            {
                // 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 },
                });
            }
        };

        var box = new VBoxContainer { MouseFilter = MouseFilterEnum.Pass };
        box.AddThemeConstantOverride("separation", 6);
        card.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 || clade.Detriments.Length > 0)
        {
            var chips = new HFlowContainer { MouseFilter = MouseFilterEnum.Pass };
            chips.AddThemeConstantOverride("h_separation", 6);
            chips.AddThemeConstantOverride("v_separation", 4);
            box.AddChild(chips);

            foreach (var t in clade.Traits)
            {
                var chip = new TraitChip
                {
                    TraitName = t.Name,
                    Description = t.Description,
                };
                chips.AddChild(chip);
            }
            foreach (var d in clade.Detriments)
            {
                var chip = new TraitChip
                {
                    TraitName = d.Name,
                    Description = d.Description,
                    Detriment = true,
                };
                chips.AddChild(chip);
            }
        }

        return card;
    }
}