using System;

namespace Babushka.scripts.CSharp.Common.Farming;

/// <summary>
/// Holds Information about the current state of the watering can.
/// Since there is only one watering can, we can track this in one central static class.
/// </summary>
public static class WateringCanState
{
    private static int _fillstate = 0;
    
    /// <summary>
    /// How many fields can be watered with one filling of the watering can.
    /// </summary>
    public const int MAX_FILLSTATE = 6;
    
    /// <summary>
    /// The Tool ID of the watering can. Used to identify it amongst other pickup items (and things that can be held by Vesna).
    /// </summary>
    public const int WATERING_CAN_ID = 1;
    
    /// <summary>
    /// Whether or not the watering can is currently active, i.e. held in hand by Vesna.
    /// Triggers animations and ui.
    /// </summary>
    public static bool Active = false;
    
    public delegate void WateringCanDelegate(bool state);
    public static event WateringCanDelegate WateringCanActiveStateChanged;
    public static event Action? OnWater;
        

    
    /// <summary>
    /// Resets the fillstate to the max amount.
    /// </summary>
    public static void Fill()
    {
        _fillstate = MAX_FILLSTATE;
    }

    /// <summary>
    /// Called when watering a field. Reduces the current fillstate.
    /// </summary>
    public static void Water()
    {
        if(_fillstate > 0)
        {
            _fillstate--;
            OnWater?.Invoke();
        }
    }

    /// <summary>
    /// Resets the watering can. Equivalent to "Empty" state.
    /// </summary>
    public static void Reset()
    {
        _fillstate = 0;
    }

    /// <summary>
    /// Returns the current fill state of the watering can.
    /// </summary>
    /// <returns></returns>
    public static int GetFillState()
    {
        return _fillstate;
    }

    /// <summary>
    /// Sets the Active state of the watering can, i.e. if it is currently in hand and if the ui should be active.
    /// </summary>
    /// <param name="active"></param>
    public static void SetActive(bool active)
    {
        if(active != Active)
            WateringCanActiveStateChanged?.Invoke(active);
        Active =  active;
    }
}