using UnityEngine;

namespace GamecraftModdingAPI.Interface.IMGUI
{
    /// <summary>
    /// A simple text label.
    /// This wraps Unity IMGUI's Label.
    /// </summary>
    public class Label : UIElement
    {
        private bool automaticLayout = false;

        /// <summary>
        /// String to display on the label.
        /// </summary>
        public string Text { get; set; }
        
        /// <summary>
        /// The rectangular area that the label can use.
        /// </summary>
        public Rect Box { get; set; } = Rect.zero;
        
        public void OnGUI()
        {
            if (automaticLayout)
            {
                GUILayout.Label(Text, Constants.Default.label);
            }
            else
            {
                GUI.Label(Box, Text, Constants.Default.label);
            }
        }

        /// <summary>
        /// The label's unique name.
        /// </summary>
        public string Name { get; }
        
        /// <summary>
        /// Whether to display the label.
        /// </summary>
        public bool Enabled { set; get; } = true;

        /// <summary>
        /// Initializes a new instance of the <see cref="T:GamecraftModdingAPI.Interface.IMGUI.Label"/> class with automatic layout.
        /// </summary>
        /// <param name="initialText">Initial string to display on the label.</param>
        /// <param name="name">The element's name.</param>
        public Label(string initialText = null, string name = null)
        {
            automaticLayout = true;
            Text = initialText;
            if (name == null)
            {
                this.Name = typeof(Label).FullName + "::" + initialText;
            }
            else
            {
                this.Name = name;
            }
            IMGUIManager.AddElement(this);
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="T:GamecraftModdingAPI.Interface.IMGUI.Label"/>.
        /// </summary>
        /// <param name="box">Rectangular area for the label.</param>
        /// <param name="initialText">Initial string to display on the label.</param>
        /// <param name="name">The element's name.</param>
        public Label(Rect box, string initialText = null, string name = null) : this(initialText, name)
        {
            this.Box = box;
            automaticLayout = false;
        }
    }
}