using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Graphics;
 
namespace NameSpace
{
    class TextInput
    {
        public Rectangle TextLoc;
        public string Text;
        KeyboardState OldState;
        public bool Active = false;
        private SpriteFont Font;
        private Texture2D BackImage;
        public Color[] Colour = new Color[2];
        int MaxCharacters;
 
        public TextInput(string Default, Rectangle DrawTo, SpriteFont _Font, Texture2D BackGround, Color Active_Colour, Color Static_Colour)
        {
            Text = Default; TextLoc = DrawTo; Font = _Font; BackImage = BackGround; Colour[0] = Active_Colour; Colour[1] = Static_Colour;
            OldState = new KeyboardState(); MaxCharacters = -1;
        }
 
        public int Max_Characters
        {set { MaxCharacters = value; }}
        public int Remaining_Characters
        {
            get
            {
                if (MaxCharacters > 0) { return MaxCharacters - Text.Length; }
                return 0;
            }
        }
 
        public void Draw(SpriteBatch SB)
        {
            int YPos = (int)((TextLoc.Y + (TextLoc.Height / 2)) - (Font.MeasureString("|").Y / 2));
            int XPos = (int)((TextLoc.X + (TextLoc.Width / 2)) - (Font.MeasureString(Text).X / 2));
            if (Active) { SB.Draw(BackImage, TextLoc, Colour[0]); }
            else { SB.Draw(BackImage, TextLoc, Colour[1]); }
            SB.DrawString(Font, Text, new Vector2(XPos, YPos), Color.Black);
        }
 
        public void Update()
        {
            if (Active)
            {
                KeyboardState NewState = Keyboard.GetState();
                Keys[] PressedKeys = NewState.GetPressedKeys();
                foreach (Keys key in PressedKeys)
                {
                    if (OldState.IsKeyUp(key))
                    {
                        //Backspace
                        if (key == Keys.Back) { if (Text.Length > 0) { Text = Text.Remove(Text.Length - 1, 1); } }
                        //Space
                        else if (key == Keys.Space) { if (Text.Length > 0) { Text = Text + " "; } }
                        //Confirm the textbox
                        else if (key == Keys.Enter) { Active = false; }
                        //Numbers
                        else if (key == Keys.D0 || key == Keys.D1 || key == Keys.D2 || key == Keys.D3 || key == Keys.D4 || key == Keys.D5 || key == Keys.D6 || key == Keys.D7 || key == Keys.D8 || key == Keys.D9)
                        { string DUD = key.ToString(); Text += DUD.Remove(0, 1); }
                        //Letters
                        else if (key == Keys.A || key == Keys.B || key == Keys.C || key == Keys.D || key == Keys.E || key == Keys.F || key == Keys.G || key == Keys.H || key == Keys.I || key == Keys.J || key == Keys.K || key == Keys.L || key == Keys.M || key == Keys.N || key == Keys.O || key == Keys.P || key == Keys.Q || key == Keys.R || key == Keys.S || key == Keys.T || key == Keys.U || key == Keys.V || key == Keys.W || key == Keys.X || key == Keys.Y || key == Keys.Z)
                        { try { Text += key.ToString(); } catch { } }
                        //The rest get ignored as their .ToString()s suck
                    }
                }
                OldState = NewState;
                if (MaxCharacters > -1 && Text.Length > MaxCharacters)
                { Text = Text.Remove(MaxCharacters, Text.Length - MaxCharacters); }
            }
        }
 
    }
}