using System;
using System.Collections.Generic;
using System.Linq;
using Godot;

public static class ExtensionHelper
{
    // public static Card GetCardWithId(this SceneTree tree, string id)
    // {
    //     const string CardGroup = "Card";
    //     var cards = tree.GetNodesInGroup(CardGroup);
    //     foreach (var card in cards)
    //     {
    //         if (card is Card c)
    //         {
    //             if (c.Id == id)
    //                 return c;
    //         }
    //         else
    //             throw new System.Exception($"Node in group {CardGroup} is not of type {nameof(Card)}");
    //     }
    //     return null;
    // }
    // public static Row GetRowWithId(this SceneTree tree, string id)
    // {
    //     const string RowGroup = "Card";
    //     var rows = tree.GetNodesInGroup(RowGroup);
    //     foreach (var row in rows)
    //     {
    //         if (row is Row r)
    //         {
    //             if (r.Id == id)
    //                 return r;
    //         }
    //         else
    //             throw new System.Exception($"Node in group {RowGroup} is not of type {nameof(Row)}");
    //     }
    //     return null;
    // }
    public static IEnumerable<Node> GetAllDescendents(this Node node, bool includeInternal = false)
    {
        foreach (Node n in node.GetChildren(includeInternal))
        {
            yield return n;
            foreach (Node c in n.GetAllDescendents())
                yield return c;
        }
    }
    // gets all descendents of a given type (in undefined order)
    public static IEnumerable<T> GetAllDescendents<T>(this Node node,
        bool includeInternal = false)
    {
        foreach (var n in node.GetAllDescendents(includeInternal))
            if (n is T t)
                yield return t;
    }
    public static string GetUnusedRowId(this SceneTree tree)
    {
        var ids = tree.GetNodesInGroup("RowGroup").OfType<row>().Select(r => r.RowId).ToArray();
        int i = 1;
        while (true)
        {
            if (!ids.Contains(i.ToString()))
                return i.ToString();
            i++;
        }
    }
    public static string GetUnusedCardId(this SceneTree tree)
    {
        //use hashset because there are (probably) more cards than rows
        var ids = tree.GetNodesInGroup("CardGroup").OfType<card>().Select(c => c.CardId).ToHashSet();
        int i = 1;
        while (true)
        {
            if (!ids.Contains(i.ToString()))
                return i.ToString();
            i++;
        }
    }
    public static TNode GetParentOfType<TNode>(this Node node) where TNode : Node
    {
        var par = node.GetParent();
        if (par is null)
            return null;
        else if (par is TNode as_tnode)
            return as_tnode;
        else
            return par.GetParentOfType<TNode>();
    }
    public static Vector2 Union(this Vector2 vect, Vector2 other)
        => new(Math.Max(vect.X, other.X), Math.Max(vect.Y, other.Y));
    public static Vector2I Union(this Vector2I vect, Vector2 other)
        => new((int)Math.Max(vect.X, other.X), (int)Math.Max(vect.Y, other.Y));
}