using System;
using Babushka.scripts.CSharp.Common.CharacterControls;
using Babushka.scripts.CSharp.Common.DayAndNight;
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, ISaveable
{
    [ExportGroup("Persistence")]
    [Export] private VariableNode _fieldIndex;
    [Export] private Node _saveIdHolder;
    [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;
    
    [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 int _currentDay;

    public bool IsPlanted;

    private PlantBehaviour2D? _currentPlant;
    
    private const string DAY_COUNTER_SAVE_ID = "12c6da2e-fc71-4281-a04a-dfd3c7943975";

    [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 || IsPlanted) && _wateringCanActive && WateringCanState.GetFillState() > 0;
        
        PlantingInteraction.IsActive = _canPlant || _canWater;
    }

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

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

    public override void _EnterTree()
    {
        LoadFromSaveData();
    }

    public override void _Ready()
    {
        if(PlantingPlaceholder.GetChildCount() > 0)
            _currentPlant = PlantingPlaceholder.GetChild<PlantBehaviour2D>(0);
        UpdateFieldState(FieldState);
        
        int randomIndex = new Random().Next(0, _maskTexture.Length);
        _maskSprite.Texture = _maskTexture[randomIndex];
        _outlineSprite.Texture = _maskOutlineTextures[randomIndex];
        base._Ready();
    }
    
    public void UpdateFieldState(FieldState state, bool updateSaveAfter = true)
    {
        switch (state)
        {
            case FieldState.Empty:
                FieldState = FieldState.Empty;
                PlantingInteraction.IsActive = false;
                break;
            case FieldState.Tilled:
                FieldState = FieldState.Tilled;
                _fieldSprite.Texture = Tilled;
                if(!IsPlanted)
                    PlantingInteraction.IsActive = true;
                break;
            case FieldState.Watered:
                FieldState = FieldState.Watered;
                _fieldSprite.Texture = Watered;
                if(!IsPlanted)
                    PlantingInteraction.IsActive = true;
                break;
            default:
                FieldState = FieldState.NotFound;
                break;
        }
        UpdateInteractionArea();
        if(updateSaveAfter)
            UpdateSaveData();
    }

    public void Water()
    {
        if (WateringCanState.GetFillState() > 0 && FieldState != FieldState.Watered)
        {
            UpdateFieldState(FieldState.Watered);
            _wateringParticles.Emitting = true;
            WateringCanState.Water();
            _wateringEvent.Raise();

            if (_currentPlant != null)
            {
                _currentPlant.DaysWatered++;
                UpdateSaveData();
            }
        }
    }
    
    /// <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);
            UpdateSaveData();
        }

        if (_canWater)
        {
            Water();
        }
    }
    
    public void ChangePlantedState()
    {
        IsPlanted = true;
        if(FieldState == FieldState.Tilled)
            _fieldSprite.Texture = Tilled;
        if(FieldState == FieldState.Watered)
            _fieldSprite.Texture = Watered;
        PlantingInteraction.IsActive = false;
    }

    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))
        {
            PlantPrefab(plantPrefabPath);
            InventoryManager.Instance.playerInventory.RemoveItem(currentSlotIndex);
            success = true;
        }
        
        return success;
    }

    private void PlantPrefab(string prefabPath)
    {
        InstantiatePlant(prefabPath);

        if (_currentPlant != null)
        {
            ChangePlantedState();
            _currentPlant.DayPlanted = _currentDay;
        }
    }

    private void InstantiatePlant(string prefabPath)
    {
        PackedScene prefab = ResourceLoader.Load<PackedScene>(prefabPath, nameof(PackedScene));
        Node2D plant2d = prefab.Instantiate<Node2D>();
        PlantingPlaceholder.AddChild(plant2d);
        plant2d.GlobalPosition = PlantingPlaceholder.GlobalPosition;
        _currentPlant = plant2d as PlantBehaviour2D;

        if (_currentPlant != null)
        {
            _currentPlant.Field = this;
        }
    }

    public void HarvestPlant()
    {
        _currentPlant = null;
        UpdateFieldState(FieldState.Empty, true);
        IsPlanted = false;
    }
    
    #region SAVE AND LOAD

    /// <summary>
    /// Update save data as prep for scene transition (when data is saved and loaded from disk).
    /// </summary>
    public void UpdateSaveData()
    {
        var payloadData = new Dictionary<string, Variant>
        {
            { "field_state", (int)FieldState },
            { "day_count_on_last_exit", _currentDay},
        };

        if (IsPlanted)
        {
            payloadData.Add(
                "plant_data", new Dictionary<string, Variant>()
                {
                    { "prefab_path", _currentPlant.PrefabPath },
                    { "plant_start_day", _currentPlant.DayPlanted },
                    { "plant_watered_days", _currentPlant.DaysWatered }
                }
            );
        }
        
        string id = _saveIdHolder.GetMeta("SaveID").AsString();
        SavegameService.AppendDataToSave(id, payloadData);
    }

    /// <summary>
    /// Loads on scene enter.
    /// </summary>
    public void LoadFromSaveData()
    {
        // Get field and plant data
        string id = _saveIdHolder.GetMeta("SaveID").AsString();
        
        Dictionary<string, Variant> save = SavegameService.GetSaveData(id);
        
        // if we already have a plant, don't instantiate another one
        int plantCount = PlantingPlaceholder.GetChildCount();

        if (save.Count > 0)
        {
            // get plant first because it's also relevant for the field state
            if (save.TryGetValue("plant_data", out Variant plantDataVar))
            {
                IsPlanted = true;
                Dictionary<string, Variant> plantDataDict =  plantDataVar.AsGodotDictionary<string, Variant>();

                if (plantDataDict.TryGetValue("prefab_path", out Variant prefabPathVar))
                {
                    if(plantCount == 0)
                        InstantiatePlant(prefabPathVar.AsString());
                    else
                        _currentPlant = PlantingPlaceholder.GetChild(0) as PlantBehaviour2D;
                }
                else
                {
                    return;
                }
                
                if (plantDataDict.TryGetValue("plant_start_day", out Variant plantStartDay) && _currentPlant != null)
                {
                    _currentPlant.DayPlanted = plantStartDay.AsInt32();
                }
                if (plantDataDict.TryGetValue("plant_watered_days", out Variant plantDaysWatered) && _currentPlant != null)
                {
                    _currentPlant.DaysWatered = plantDaysWatered.AsInt32();
                }
            }
            
            // Get current day count: Load only. Saving the day count is handled on the day and night prefab.
            Dictionary<string, Variant> dayCountSave = SavegameService.GetSaveData(DAY_COUNTER_SAVE_ID);

            if (dayCountSave.Count > 0)
            {
                if (dayCountSave.TryGetValue("payload", out Variant dayCountVar))
                {
                    _currentDay = dayCountVar.AsInt32();
                    if (_currentPlant != null)
                    {
                        _currentPlant.CurrentDayInCalendar = _currentDay;
                    }
                }
            }
            
            // get field state
            if (save.TryGetValue("field_state", out Variant fieldStateVar))
            {
                int fieldStateInt = fieldStateVar.AsInt32();

                // if the field has been unlocked, make it visible.
                if (fieldStateInt != 0)
                {
                    Visible = true;

                    if (save.TryGetValue("day_count_on_last_exit", out Variant lastDayCountVar))
                    {
                        int lastDayCount =  lastDayCountVar.AsInt32();
                        
                        // if day is today, then just use the provided field state as is.
                        if (CalendarController.Instance != null && _currentDay != lastDayCount)
                        {
                            // if the field was watered the day before, set it to tilled
                            if (fieldStateInt == 3)
                            {
                                fieldStateInt = 1;
                            }
                        }
                    }
                    
                    FieldState = (FieldState) fieldStateInt;
                    UpdateFieldState(FieldState, false);
                }
            }
        }
    }
#endregion
    
}