using System;
using System.Collections.Generic;
using Gamesmiths.Forge.Godot.Resources.Abilities;
using Godot;
using Movementtests.systems;

[Tool, GlobalClass]
public partial class AbilitySelection : Control
{
    [Signal] public delegate void AbilityAddedEventHandler(WeaponSystem.WeaponEvent forEvent, ForgeAbilityBehavior behavior);
    [Signal] public delegate void AbilityRemovedEventHandler(WeaponSystem.WeaponEvent forEvent, ForgeAbilityBehavior behavior);
    
    [Export] public WeaponSystem.WeaponEvent ForEvent { get; set; } = WeaponSystem.WeaponEvent.StartedFlying;
    
    [Export] public string Title { get; set; } = string.Empty;
    
    [Export] public PackedScene AbilitySelectedItem { get; set; }
    
    [Export] public ForgeAbilityBehavior[] AbilityBehaviors { get; set; }

    private VBoxContainer _selectedAbilities;
    private MenuButton _addAbility;
    private PopupMenu _addAbilityMenu;
    
    public override void _Ready()
    {
        var titleLabel = GetNode<Label>("%TitleLabel");
        titleLabel.Text = Title;
        
        _selectedAbilities = GetNode<VBoxContainer>("%SelectedAbilities");
        _addAbility = GetNode<MenuButton>("%AddAbility");
        _addAbilityMenu = _addAbility.GetPopup();
        
        if (Engine.IsEditorHint()) return;
        
        var i = 0;
        foreach (var behavior in AbilityBehaviors)
        {
            _addAbilityMenu.AddIconItem(behavior.Icon, behavior.Name);
            _addAbilityMenu.SetItemMetadata(i, behavior);
            i += 1;
        }
        
        _addAbilityMenu.IndexPressed += AddAbilityMenuOnIndexPressed;
    }

    public void Initialize(IEnumerable<Resource> equippedAbilities)
    {
        foreach (var equippedAbility in equippedAbilities)
        {
            if (equippedAbility is not ForgeAbilityBehavior ability) continue;
            AddSelectedAbility(ability);
        }
    }

    private void AddAbilityMenuOnIndexPressed(long index)
    {
        var indexInt = Convert.ToInt32(index);
        var metadata = (ForgeAbilityBehavior) _addAbilityMenu.GetItemMetadata(indexInt);
        EmitSignalAbilityAdded(ForEvent, metadata);
    }

    public void AddSelectedAbility(ForgeAbilityBehavior behavior)
    {
        var newSelectedAbilityItem = AbilitySelectedItem.Instantiate() as SelectedAbility;
        if (newSelectedAbilityItem == null) return;
        
        newSelectedAbilityItem.SetAbility(behavior);
        newSelectedAbilityItem.AbilityRemoved += ability => EmitSignalAbilityRemoved(ForEvent, ability);
        _selectedAbilities.AddChild(newSelectedAbilityItem);
    }
    
    public void RemoveSelectedAbility(ForgeAbilityBehavior behavior)
    {
        foreach (var child in _selectedAbilities.GetChildren())
        {
            if (child is not SelectedAbility selectedAbility || selectedAbility.Ability != behavior) continue;
            _selectedAbilities.RemoveChild(selectedAbility);
            _addAbility.GrabFocus();
            return;
        }
    }
}