using System.Collections.Generic;
using Godot;

namespace Babushka.scripts.CSharp.Common.Farming;

public partial class FieldService : Node
{
    private Dictionary<string, FieldsInScene>? outerDict;
    
    [Signal] public delegate void FieldCreatedEventHandler();
    
    public static FieldService Instance { get; private set; } = null!;

    public override void _EnterTree()
    {
            Instance = this;
            outerDict = new Dictionary<string, FieldsInScene>();
    }
    

    //Create
    public bool TryAddEntry(string sceneName, Vector2I position, FieldBehaviour2D field)
    {
        if (outerDict != null )
        {
            FieldsInScene fieldsInScene;
            bool outerDictEntryExists = outerDict.TryGetValue(sceneName, out fieldsInScene);
            
            if (!outerDictEntryExists)
            {
                fieldsInScene = new FieldsInScene();
                outerDict.Add(sceneName, fieldsInScene);
            }
            
            if (!fieldsInScene.fields.ContainsKey(position))
            {
                fieldsInScene.fields.Add(position, field);
                EmitSignal(SignalName.FieldCreated);
                return true;
            }
        }
        return false;
    }
    
    // Read
    public FieldBehaviour2D? TryGet(string key, Vector2I fieldPosition)
    {
        if (outerDict != null && outerDict.TryGetValue(key, out FieldsInScene? field))
        {
            if (field.fields.TryGetValue(fieldPosition, out FieldBehaviour2D? fieldInstance))
            {
                return fieldInstance;
            }
        }
        return null;
    }
    
    
    //Update
    public void UpdateEntry(string key, Vector2I fieldPosition, FieldBehaviour2D state)
    {
        if (outerDict != null && outerDict.TryGetValue(key, out FieldsInScene? field))
        {
            if (field.fields.ContainsKey(fieldPosition))
            {
                field.fields[fieldPosition] = state;
            }
            else
            {
                TryAddEntry(key, fieldPosition, state);
            }
        }
    }
    
    //Delete

    public void RemoveEntry(string key, Vector2I fieldPosition)
    {
        if (outerDict != null && outerDict.TryGetValue(key, out FieldsInScene? field))
        {
            if (field.fields.ContainsKey(fieldPosition))
            {
                field.fields.Remove(fieldPosition);
            }
        }
    }
}

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

    public FieldsInScene()
    {
        fields = new Dictionary<Vector2I, FieldBehaviour2D?>();
    }
}