using System.Collections.Generic;
using Godot;

namespace Babushka.scripts.CSharp.Common.Farming;

public partial class FieldService : Node2D
{
    private Dictionary<PackedScene, FieldsInScene>? fieldsPerScene;



    [Signal] public delegate void FieldCreatedEventHandler();
    
    //Create
    public bool TryAddEntry(PackedScene scene, Vector2I key, FieldBehaviour2D field)
    {
        if (!fieldsPerScene.ContainsKey(scene))
        {
            FieldsInScene fieldInstance = new FieldsInScene();
            fieldsPerScene.Add(scene, fieldInstance);
            EmitSignal(SignalName.FieldCreated);
            return true;
        }
        return false;
    }
    
    // Read
    public FieldBehaviour2D Get(PackedScene key, Vector2I fieldPosition)
    {
        if (fieldsPerScene.TryGetValue(key, out FieldsInScene field))
        {
            if (field.fields.TryGetValue(fieldPosition, out FieldBehaviour2D fieldInstance))
                return fieldInstance;
        }
            
        return null;
    }
    
    //todo: 
    // - Make this a singleton
    // - Let this interact with the FarmingControls and the FieldBehaviours
    // - Replace FieldService2D and remove it from scenes.
    
    
    /*
    //Update
    public void UpdateEntry(Vector2I fieldPosition, FieldBehaviour2D state)
    {
        
        if (fields.ContainsKey(fieldPosition))
        {
            fields[fieldPosition] = state;
        }
        else
        {
            TryAddEntry(fieldPosition, state);
        }
    }
    
    //Delete

    public void RemoveEntry(Vector2I fieldPosition)
    {
        if (fields.ContainsKey(fieldPosition))
        {
            fields.Remove(fieldPosition);
        }
    }
    */
}

internal class FieldsInScene 
{
    public Dictionary<Vector2I, FieldBehaviour2D> fields;
}