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

namespace Theriapolis.GodotHost.Scenes.Steps;

/// <summary>
/// Step II — Species. Direct port of <c>StepSpecies</c> in
/// <c>src/steps.jsx</c> plus the Phase 6.5 hybrid extension: when
/// <see cref="CharacterDraft.IsHybrid"/> is true the step shows two
/// stacked grids, one filtered by SireCladeId and one by DamCladeId.
/// </summary>
public partial class StepSpecies : VBoxContainer, IStep
{
    private CharacterDraft _draft = null!;
    private VBoxContainer _purebredSection = null!;
    private VBoxContainer _hybridSection = null!;
    private GridContainer _purebredGrid = null!;
    private GridContainer _sireGrid = null!;
    private GridContainer _damGrid = null!;

    public void Bind(CharacterDraft draft)
    {
        _draft = draft;
        // Defer Refresh so it runs after the click callback that triggered
        // Changed completes — Free() called on a card mid-callback returns
        // without freeing, leaving a stale duplicate in the grid.
        _draft.Changed += () => Callable.From(Refresh).CallDeferred();
        Build();
    }

    public string? Validate() => WizardValidation.Validate(1, _draft);

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

        var intro = new VBoxContainer();
        intro.AddThemeConstantOverride("separation", 6);
        AddChild(intro);
        intro.AddChild(new Label { Text = "FOLIO II · SPECIES" });
        intro.AddChild(new Label { Text = "Choose a Species" });
        intro.AddChild(new Label
        {
            Text = "Refine your line. Species inherits the clade's traits and adds its "
                 + "own — body size, base movement speed, and species-specific abilities. "
                 + "Hybrid characters pick one species per parent lineage.",
            AutowrapMode = TextServer.AutowrapMode.WordSmart,
        });

        _purebredSection = new VBoxContainer();
        _purebredSection.AddThemeConstantOverride("separation", 6);
        AddChild(_purebredSection);
        _purebredGrid = MakeGrid();
        _purebredSection.AddChild(_purebredGrid);

        _hybridSection = new VBoxContainer();
        _hybridSection.AddThemeConstantOverride("separation", 16);
        AddChild(_hybridSection);

        _hybridSection.AddChild(new Label { Text = "SIRE — Paternal Lineage" });
        _sireGrid = MakeGrid();
        _hybridSection.AddChild(_sireGrid);

        _hybridSection.AddChild(new Label { Text = "DAM — Maternal Lineage" });
        _damGrid = MakeGrid();
        _hybridSection.AddChild(_damGrid);

        Refresh();
    }

    private static GridContainer MakeGrid()
    {
        var grid = new GridContainer { Columns = 3, SizeFlagsHorizontal = SizeFlags.ExpandFill };
        grid.AddThemeConstantOverride("h_separation", 16);
        grid.AddThemeConstantOverride("v_separation", 16);
        return grid;
    }

    private void Refresh()
    {
        if (_purebredGrid is null) return;
        bool hybrid = _draft.IsHybrid;
        _purebredSection.Visible = !hybrid;
        _hybridSection.Visible = hybrid;

        if (hybrid)
        {
            RefreshGrid(_sireGrid, _draft.SireCladeId, _draft.SireSpeciesId,
                spId => _draft.Patch(new Godot.Collections.Dictionary { { "sire_species_id", spId } }));
            RefreshGrid(_damGrid, _draft.DamCladeId, _draft.DamSpeciesId,
                spId => _draft.Patch(new Godot.Collections.Dictionary { { "dam_species_id", spId } }));
        }
        else
        {
            RefreshGrid(_purebredGrid, _draft.CladeId, _draft.SpeciesId,
                spId => _draft.Patch(new Godot.Collections.Dictionary { { "species_id", spId } }));
        }
    }

    private static void RefreshGrid(GridContainer grid, string cladeId, string selectedSpecies, System.Action<string> onClick)
    {
        foreach (var c in grid.GetChildren()) c.Free();
        if (string.IsNullOrEmpty(cladeId)) return;
        foreach (var sp in CodexContent.SpeciesOfClade(cladeId))
            grid.AddChild(BuildCard(sp, sp.Id == selectedSpecies, onClick));
    }

    private static Control BuildCard(SpeciesDef sp, bool selected, System.Action<string> onClick)
    {
        var card = new PanelContainer
        {
            CustomMinimumSize = new Vector2(200, 0),
            MouseFilter = MouseFilterEnum.Stop,
        };
        if (selected) card.Modulate = new Color(1f, 0.95f, 0.85f);

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

        var box = new VBoxContainer { MouseFilter = MouseFilterEnum.Pass };
        box.AddThemeConstantOverride("separation", 6);
        card.AddChild(box);

        box.AddChild(new Label { Text = sp.Name });
        box.AddChild(new Label { Text = $"{sp.Size.ToUpperInvariant()} · {sp.BaseSpeedFt} FT/TURN" });

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

        if (sp.Traits.Length > 0 || sp.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 sp.Traits)
                chips.AddChild(new TraitChip { TraitName = t.Name, Description = t.Description });
            foreach (var d in sp.Detriments)
                chips.AddChild(new TraitChip { TraitName = d.Name, Description = d.Description, Detriment = true });
        }

        return card;
    }
}