using System;
using Babushka.scripts.CSharp.Common.CharacterControls;
using Babushka.scripts.CSharp.Common.Inventory;
using Babushka.scripts.CSharp.Common.Savegame;
using Babushka.scripts.CSharp.Low_Code.Events;
using Babushka.scripts.CSharp.Low_Code.Variables;
using Godot;
using Godot.Collections;

namespace Babushka.scripts.CSharp.Common.Farming;

/// <summary>
/// Defines the behaviour of the field, i.e. interactions, states and effects.
/// </summary>
[GlobalClass]
public partial class FieldBehaviour2D : Sprite2D
{
    [ExportGroup("Persistence")]
    [Export] public string SaveId = "";
    [Export] private VariableNode _fieldIndex;
    [Export] public VariableResource _sceneKeyProvider;
    [Export] public FieldState FieldState = FieldState.Tilled;
    
    [ExportGroup("Field Visuals")]
    [Export] private Sprite2D _fieldSprite;
    [Export] private Sprite2D _maskSprite;
    [Export] private Sprite2D _outlineSprite;
    [Export] private Texture2D[] _maskOutlineTextures;
    [Export] private Texture2D[] _maskTexture;
    [Export] private Texture2D Tilled;
    [Export] private Texture2D Watered;
    
    [ExportGroup("Field Interactions")]
    [Export] public InteractionArea2D PlantingInteraction;
    [Export] public InteractionArea2D FieldInteractionArea;
    
    [ExportGroup("Configuration")]
    [Export] public Node2D PlantingPlaceholder;
    [Export] public ItemRepository ItemRepository;
    [Export] private CpuParticles2D _wateringParticles;
    [Export] private EventResource _wateringEvent;

    private bool _seedsActive;
    private bool _wateringCanActive;

    private bool _canPlant;
    private bool _canWater;

    private PlantBehaviour2D? _currentPlant;

    [Signal] public delegate void PlantedEventHandler();

    private void UpdateInteractionArea()
    {
        // fieldstate == tilled / watered && samen im Inventar
        _canPlant = (FieldState == FieldState.Tilled ||  FieldState == FieldState.Watered) && _seedsActive;
        // fieldstate == tilled && watering can ausgewählt
        _canWater = (FieldState == FieldState.Tilled || FieldState == FieldState.Planted) && _wateringCanActive;
        FieldInteractionArea.IsActive = _canPlant || _canWater;
    }

    public void ActivatedSeedInInventory(bool activated)
    {
        _seedsActive = activated;
        UpdateInteractionArea();
    }

    public void ActivateWateringCanInInventory(bool activated)
    {
        _wateringCanActive = activated;
        UpdateInteractionArea();
    }

    public override void _Ready()
    {
        
        if(PlantingPlaceholder.GetChildCount() > 0)
            _currentPlant = PlantingPlaceholder.GetChild<PlantBehaviour2D>(0);
        UpdateFieldState(FieldState);
        
        FieldService.Instance.TryAddEntry(_sceneKeyProvider.Payload.AsString(),_fieldIndex.Payload.AsInt32(), this);
        
        int randomIndex = new Random().Next(0, _maskTexture.Length);
        _maskSprite.Texture = _maskTexture[randomIndex];
        _outlineSprite.Texture = _maskOutlineTextures[randomIndex];
        base._Ready();
    }
    
    public void UpdateFieldState(FieldState state)
    {
        switch (state)
        {
            case FieldState.Empty:
                FieldState = FieldState.Empty;
                PlantingInteraction.IsActive = false;
                break;
            case FieldState.Tilled:
                FieldState = FieldState.Tilled;
                _fieldSprite.Texture = Tilled;
                PlantingInteraction.IsActive = true;
                break;
            case FieldState.Watered:
                FieldState = FieldState.Watered;
                _fieldSprite.Texture = Watered;
                PlantingInteraction.IsActive = true;
                break;
            case FieldState.Planted:
                FieldState = FieldState.Planted;
                _fieldSprite.Texture = Tilled;
                PlantingInteraction.IsActive = false;
                break;
            default:
                FieldState = FieldState.NotFound;
                break;
        }
        UpdateInteractionArea();
        UpdateSaveData();
    }


    public void Water()
    {
        if (WateringCanState.GetFillState() > 0)
        {
            UpdateFieldState(FieldState.Watered);
            _wateringParticles.Emitting = true;
            WateringCanState.Water();
            _wateringEvent.Raise();
        }
    }
    
    /// <summary>
    /// Called when the player enters the field's interaction area and presses <E> or clicks.
    /// </summary>
    public void Farm()
    {
        if (_canPlant && TryPlant())
        { 
            EmitSignal(SignalName.Planted);
            UpdateFieldState(FieldState.Planted);
        }

        if (_canWater)
        {
            Water();
        }
    }

    private bool TryPlant()
    {
        bool success = false;
        int currentSlotIndex = InventoryManager.Instance.CurrentSelectedSlotIndex;
        ItemInstance? item = InventoryManager.Instance.playerInventory.Slots[currentSlotIndex].itemInstance;
        
        if (item == null || PlantingPlaceholder.GetChildCount() > 0 || item.amount == 0)
            return success;
        
        string plantPrefabPath = ItemRepository.TryGetPrefabPath(item.blueprint);

        if (!string.IsNullOrEmpty(plantPrefabPath))
        {
            PackedScene prefab = ResourceLoader.Load<PackedScene>(plantPrefabPath, nameof(PackedScene));
            Node2D plant2d = prefab.Instantiate<Node2D>();
            PlantingPlaceholder.AddChild(plant2d);
            plant2d.GlobalPosition = PlantingPlaceholder.GlobalPosition;
            _currentPlant = plant2d as PlantBehaviour2D;

            if (_currentPlant != null)
            {
                _currentPlant.Field = this;
            }
            
            InventoryManager.Instance.playerInventory.RemoveItem(currentSlotIndex);
            success = true;
        }
        
        return success;
    }


    public void UpdateSaveData()
    {
        var saveData = new SaveData();
        
        saveData.SceneName = _sceneKeyProvider.Payload.AsString();
        saveData.Id = SaveId + _fieldIndex.Payload.AsString();
        var payloadData = new Dictionary<string, Variant>
        {
            { "field_state", (int)FieldState }
        };

        if (_currentPlant != null)
        {
            payloadData.Add(
                "plant_data", new Dictionary<string, Variant>()
                {
                    { "prefab_path", _currentPlant.PrefabPath },
                    { "plant_state", (int)_currentPlant.State },
                    { "plant_days_growing", _currentPlant.DaysGrowing }
                }
            );
        }
        
        saveData.JsonPayload = Json.Stringify(payloadData, indent: "\t");
        
        SavegameService.AppendSave(saveData);
    }

}