using UnityEngine;
using System;

/// <summary>
/// Draws the field/property ONLY if the compared property compared by the comparison type with the value of comparedValue returns true.
/// Based on: https://forum.unity.com/threads/draw-a-field-only-if-a-condition-is-met.448855/
/// </summary>
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = true)]
public class DrawIfAttribute : PropertyAttribute
{
    #region Fields

    public string comparedPropertyName { get; private set; }
    public object comparedValue { get; private set; }
    public DisablingType disablingType { get; private set; }
    public Comparator comparisonMethod { get; private set; }

    /// <summary>
    /// Types of comperisons.
    /// </summary>
    public enum DisablingType
    {
        ReadOnly = 2,
        DontDraw = 3
    }
    public enum Comparator
    {
        Equal=0,
        NotEqual=1
    }

    #endregion

    /// <summary>
    /// Only draws the field only if a condition is met. Supports enum and bools.
    /// </summary>
    /// <param name="comparedPropertyName">The name of the property that is being compared (case sensitive).</param>
    /// <param name="comparedValue">The value the property is being compared to.</param>
    /// <param name="disablingType">The type of disabling that should happen if the condition is NOT met. Defaulted to DisablingType.DontDraw.</param>
    public DrawIfAttribute(string comparedPropertyName, object comparedValue, DisablingType disablingType = DisablingType.ReadOnly, Comparator comparisonMethod=Comparator.Equal)
    {
        this.comparedPropertyName = comparedPropertyName;
        this.comparedValue = comparedValue;
        this.disablingType = disablingType;
        this.comparisonMethod = comparisonMethod;
    }
}