using Babushka.scripts.CSharp.Low_Code.Variables;
using Godot;
using Godot.Collections;

namespace Babushka.scripts.CSharp.Common.Farming;

[GlobalClass]
public partial class FarmingControls2D : Node2D
{
    [Export] private VariableResource _sceneKeyProvider;
    [Export] private PackedScene? _fieldPrefab = null!;
    [Export] private Node2D _movingPlayer;
    [Export] private Camera2D _camera;
    [Export] private CpuParticles2D _wateringParticles;
    [Export] private float _wateringCanParticlesVerticalOffset = 50f;

    private int _toolId = -1;
    private bool _wateringCanFilled = false;

    
    [Signal] public delegate void WateringFieldEventHandler();
    
    #region Tools
    
    /// <summary>
    /// If no tool has been set, then set the current tool to the incoming tool id.
    /// </summary>
    /// <param name="toolId">The id of the tool to activate if possible</param>
    /// <returns>If the tool in question was activated.</returns>
    public bool TryActivateTool(int toolId)
    {
        bool activate;
        
        //if our hands are empty, activate
        if (toolId == -1)
        {
            activate = false;
        }
        else
        {
            activate = true;
        }

        _toolId = activate ? toolId : -1;
        
        WateringCanState.SetActive(_toolId == WateringCanState.WATERING_CAN_ID);
        
        return activate;
    }
    
    #endregion

    public override void _Input(InputEvent @event)
    {
        if (@event.IsActionPressed("click") 
            && _toolId == WateringCanState.WATERING_CAN_ID 
            && WateringCanState.GetFillState() > 0)
        {
            GD.Print("Trying to use the watering can.");
            Vector2I adjustedPosition = GetAdjustedMousePosition();
            WaterTheField(adjustedPosition);
        }
    }

    private Vector2I GetAdjustedMousePosition()
    {
        Vector2 mousePosition = _camera.GetGlobalMousePosition();
        Vector2I mousePositionInteger = (Vector2I) mousePosition;
        Vector2I adjustedPosition = AdjustValue(mousePositionInteger, new Vector2I(735, 651));
        return adjustedPosition;
    }
    
    /// <summary>
    /// Called by the allowed farming area collision area 2d.
    /// </summary>
    /// <param name="node"></param>
    /// <param name="inputEvent"></param>
    /// <param name="shapeIndex"></param>
    public void InputEventPressedOn(Node node, InputEvent inputEvent, int shapeIndex)
    {
        if (!inputEvent.IsPressed())
        {
            return;
        }

        if (!inputEvent.IsActionPressed("click"))
            return;
        
        if (inputEvent is InputEventMouseButton inputEventMouseButton)
        {
            if (!inputEventMouseButton.Pressed)
            {
                return;
            }
        }
        else
        {
            return;
        }
        
        if (_toolId == 0)
        {
            Vector2I adjustedPosition = GetAdjustedMousePosition();
            MakeField(adjustedPosition);
        }
    }

    #region WATERING
    public void FillWateringCan()
    {
        if (_toolId == WateringCanState.WATERING_CAN_ID)
        {
            WateringCanState.Fill();
        }
    }
    
    private void WaterTheField(Vector2I fieldPosition)
    {
        FieldBehaviour2D? field = FieldService.Instance.TryGet(_sceneKeyProvider.Payload.AsString(), fieldPosition);
        if (field == null || field.FieldState == FieldState.Watered)
        {
            GD.Print($"The field at position {fieldPosition} is null!");
            return;
        }
        
        field.Water();
        _wateringParticles.GlobalPosition = new Vector2(field.GlobalPosition.X, field.GlobalPosition.Y + _wateringCanParticlesVerticalOffset);
        WateringCanState.Water();
        GD.Print($"Watered the field at {fieldPosition}.");
        EmitSignal(SignalName.WateringField);
    }

    #endregion
    
    #region FIELD CREATION
    private void MakeField(Vector2I fieldPosition)
    {
        if(_fieldPrefab == null) 
            return;
        
        // only instantiate a field if there isn't one already.
        if(FieldService.Instance.TryGet(_sceneKeyProvider.Payload.AsString(), fieldPosition) == null)
        {
            GD.Print($"FarmingControls: Creating a field at {fieldPosition}");
            Node fieldInstance = _fieldPrefab.Instantiate();
            if (fieldInstance is Node2D field2d)
            {
                // add dictionary entry for the field
                Array<Node> fields = field2d.FindChildren("*", nameof(FieldBehaviour2D));
                if (fields.Count > 0)
                    FieldService.Instance.TryAddEntry(_sceneKeyProvider.Payload.AsString(), fieldPosition, fields[0] as FieldBehaviour2D);
                
                // reposition and reparent the instance
                field2d.Position = new Vector2(fieldPosition.X, fieldPosition.Y);;
                FieldService.Instance.AddChild(fieldInstance);
            }
        }
        else
        {
            GD.Print($"FarmingControls: Could not create a field at {fieldPosition}.");
        }
    }

    private int AdjustValue(float value)
    {
        float adjustedValue = value / 500;
        adjustedValue = Mathf.RoundToInt(adjustedValue);
        adjustedValue *= 500;
        return (int)adjustedValue;
    }

    private Vector2I AdjustValue(Vector2I input, Vector2I step)
    {
        return input.Snapped(step);
    }
    
    #endregion
}