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 Dropdown : Base {
            public SpriteFont Font = MrAG.Draw.Font;
            public Color TextColor = Color.White;

            public Color BorderColor = Color.LightGray;
            
            public Color Color = Color.Black;
            public Color HoverColor = Color.DarkGray;
            public Color BackColor = Color.Gray;
            
            public int BorderSize = 2;
            
            public MrAG.Draw.TextAlignmentX AlignmentX = MrAG.Draw.TextAlignmentX.Center;

            private bool IsOpen;

            private int OldHeight = 0;

            public List<string> Items = new List<string>();
            public string Text = "";
            public Action OnSelectedChange;

            public override void DoClick(int x, int y, MouseKey mouseKey) {
                if (!this.IsOpen)
                    this.Open();
                else{
                    for (int i = 0; i < this.Items.Count; i++ ){
                        if (y > this.OldHeight + (i * 20) && y < this.OldHeight + (i * 20) + 20){
                            this.Text = this.Items[i];

                            if (this.OnSelectedChange != null)
                                this.OnSelectedChange.Invoke();
                            break;
                        }
                    }

                    this.Close();
                }

                base.DoClick(x, y, mouseKey);
            }

            public override void Update() {
                if (this.IsOpen && MrAG.Gui.CurrentFocus != this)
                    this.Close();
            }

            public void Open(){
                this.SetFocus();
                this.IsOpen = true;

                this.OldHeight = this.Height;

                this.Height += this.Items.Count * 20;
            }

            public void Close(){
                this.IsOpen = false;
                this.Height = this.OldHeight;
            }

            public void AddItem(string text){
                this.Items.Add(text);
            }

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

                MrAG.Draw.SetFont(this.Font);
                MrAG.Draw.Text(this.Text, this.X + (this.Width / 2), this.Y + ((this.IsOpen ? this.OldHeight : this.Height) / 2), this.TextColor, MrAG.Draw.TextAlignmentX.Center, MrAG.Draw.TextAlignmentY.Center);

                if (this.IsOpen){
                    MrAG.Draw.Box(this.X + this.BorderSize, this.Y + this.OldHeight + this.BorderSize, this.Width - (this.BorderSize * 2), (this.Items.Count * 20) - (this.BorderSize * 2) + (this.BorderSize * 2), this.BackColor);
                    MrAG.Draw.OutlinedBox(this.X, this.Y + this.OldHeight, this.Width, (this.Items.Count * 20) + (this.BorderSize * 2), this.BorderSize, this.BorderColor);
                    
                    int y = MrAG.Gui.CurMouseState.Y - this.Y;
                    int x = MrAG.Gui.CurMouseState.X;
                    bool shouldhighlite = x >= this.X && x <= this.X + this.Width;

                    for (int i = 0; i < this.Items.Count; i++ ){
                        int addy = this.OldHeight + (i * 20);

                        if (shouldhighlite && y > addy && y < addy + 20){
                            MrAG.Draw.Box(this.X + this.BorderSize, this.Y + addy + this.BorderSize, this.Width - (this.BorderSize * 2), 20, this.HoverColor);
                        }

                        MrAG.Draw.Text(this.Items[i], this.X + (this.Width / 2), this.Y + addy + 10 + this.BorderSize, this.TextColor, MrAG.Draw.TextAlignmentX.Center, MrAG.Draw.TextAlignmentY.Center);
                    }
                }

                base.Draw();
            }
        }
    }
}