using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace MrAG {
    public partial class Gui {
        public class Slider : Base {
            public Color BorderColor = Color.Gray;
            public Color BackColor = Color.DarkGray;
            public Color SliderColor = Color.Blue;
            public Color LineColor = Color.Red;
            public int BorderSize;
            public int Padding = 4;
            public int LineSize = 2;
            public int SliderSize = 6;

            public Action OnValueChange;

            private int _value;
            public int Value{
                get {
                    return this._value;
                }

                set{
                    int oldval = this._value;

                    if (value > this.MaxValue)
                        this._value = this.MaxValue;
                    else if (value < 0)
                        this._value = 0;
                    else
                        this._value = value;

                    if (oldval != this._value && this.OnValueChange != null)
                        this.OnValueChange.Invoke();
                }
            }
            private int _maxvalue = 100;
            public int MaxValue {
                get {
                    return this._maxvalue;
                }

                set{
                    if (value < 0)
                        return;

                    this._maxvalue = value;
                    if (this._value > this._maxvalue)
                        this._value = this._maxvalue;
                }
            }
            
            public override void Update() {
                if (!this.IsActive() || !this.HasFocus)
                    return;

                int x = MrAG.Gui.CurMouseState.X - (this.X + this.BorderSize + this.Padding - (this.SliderSize / 2));

                this.Value = (int)Math.Round((((double)x / (double)(this.Width - (this.BorderSize * 2) - (this.Padding * 2))) * this.MaxValue));
                if (this.Value < 0)
                    this.Value = 0;

                if (this.Value > this.MaxValue)
                    this.Value = this.MaxValue;

                
                base.Update();
            }

            public override void DoScrollUp() {
                this.Value++;
                
                base.DoScrollUp();
            }

            public override void DoScrollDown() {
                this.Value--;
                
                base.DoScrollDown();
            }

            public override void Draw() {
                MrAG.Draw.Box(this.X + this.BorderSize, this.Y + this.BorderSize, this.Width - (this.BorderSize * 2), this.Height - (this.BorderSize * 2), this.BackColor);
                MrAG.Draw.OutlinedBox(this.X, this.Y, this.Width, this.Height, this.BorderSize, this.BorderColor);

                MrAG.Draw.Box(this.X + this.BorderSize + this.Padding, this.Y + (this.Height / 2) - (this.LineSize / 2), this.Width - (this.BorderSize * 2) - (this.Padding * 2), this.LineSize, this.LineColor);

                MrAG.Draw.Box(this.X + this.BorderSize + this.Padding + (int)(((double)this.Value / (double)this.MaxValue) * (this.Width - (this.BorderSize * 2) - (this.Padding * 2))) - (this.SliderSize / 2), this.Y + (this.Height / 2) - (this.SliderSize / 2), this.SliderSize, this.SliderSize, this.SliderColor);

                base.Draw();
            }
        }
    }
}