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 ListBox : Base {
            public Color BorderColor = Color.Gray;
            public Color BackColor = Color.DarkGray;
            public Color TextColor = Color.Blue;
            public Color SelectedTextColor = Color.Black;
            public Color SelectedBackColor = Color.LightGray;
            public Color LineColor = Color.Red;
            public int BorderSize;
            public int Spacing = 2;
            public int Padding = 4;
            public int LineSize = 2;
            public bool ShowLines = true;
            public SpriteFont Font = MrAG.Draw.Font;

            public Action OnSelectionChange;

            public string _selectedtext = "";
            public int _selindex = -1;
            public string SelectedText {
                get { return this._selectedtext; }

                set{
                    for (int i = 0; i < this.Items.Count; i++) {
                        if (this.Items[i].text == value) {
                            this.SelectedIndex = i;
                            return;
                        }
                    }

                    Vector2 s = this.Font.MeasureString(value);

                    ListBox_Item itm = new ListBox_Item() {
                        text = value,
                        Xsize = (int)s.X,
                        Ysize = (int)s.Y
                    };

                    this.Items.Insert(0, itm);
                    this.SelectedIndex = 0;
                }
            }

            public int SelectedIndex {
                get { return this._selindex; }

                set{
                    if (value < 0 || value >= this.Items.Count)
                        return;

                    this._selindex = value;
                    this._selectedtext = this.Items[value].text;

                    if (this.OnSelectionChange != null)
                        this.OnSelectionChange.Invoke();
                }
            }

            private List<ListBox_Item> Items = new List<ListBox_Item>();

            private MrAG.Gui.SliderV Slider;
            private bool toomuchcontent;
            private int maxitemstoshow;
            private int curshowing;

            private class ListBox_Item {
                public string text;
                public int Ysize;
                public int Xsize;
            }

            public ListBox() {
                this.Slider = new SliderV() {
                    Render = false,
                    Parent = this,
                    Width = 10
                };
            }

            public void AddItem(string text) {
                Vector2 s = this.Font.MeasureString(text);

                ListBox_Item itm = new ListBox_Item() {
                    text = text,
                    Xsize = (int)s.X,
                    Ysize = (int)s.Y
                };

                this.Items.Add(itm);
            }

            public void AddItem(string text, int index) {
                Vector2 s = this.Font.MeasureString(text);

                ListBox_Item itm = new ListBox_Item() {
                    text = text,
                    Xsize = (int)s.X,
                    Ysize = (int)s.Y
                };

                this.Items.Insert(index, itm);

                if (this.SelectedIndex > index - 1)
                    this.SelectedIndex++;
            }

            public bool RemoveItem(string text) {
                for (int i = 0; i < this.Items.Count; i++) {
                    if (this.Items[i].text == text) {
                        this.Items.RemoveAt(i);
                        return true;
                    }
                }

                return false;
            }

            public bool RemoveItem(int index) {
                if (this.Items.Count >= index && index >= 0) {
                    this.Items.RemoveAt(index);
                    return true;
                }

                return false;
            }

            public List<string> GetItems() {
                List<string> tmp = new List<string>();
                
                for (int i = 0; i < this.Items.Count; i++)
                    tmp.Add(this.Items[i].text);

                return tmp;
            }

            public override void SetSize(int w, int h) {
                this.Slider.Height = h - (this.BorderSize * 2);
                this.Slider.Y = this.BorderSize;
                this.Slider.X = w - 10 - this.BorderSize;

                base.SetSize(w, h);
            }

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

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

            public override void Update() {
                this.Slider.MaxValue = this.maxitemstoshow;
                this.Slider.Render = this.toomuchcontent;

                base.Update();
            }

            public override void KeyPress(Key key) {
                switch (key.Char) {
                    case 38:
                        this.SelectedIndex--;
                        this.Slider.Value--;
                        break;

                    case 40:
                        this.SelectedIndex++;
                        this.Slider.Value++;
                        break;
                }
                
                base.KeyPress(key);
            }

            public override void LeftMouseClick(int x, int y) {
                int addy = this.Padding;
                int slideradd = this.Padding;
                for (int i = 0; i < this.Slider.Value; i++) {
                    slideradd += this.Items[i].Ysize;
                    slideradd += this.Spacing;
                }

                for (int i = this.Slider.Value; i < this.Items.Count; i++) {
                    int tsize = this.Items[i].Ysize;
                    if (addy + tsize > this.Height)
                        break;

                    int newy = addy;
                    newy += this.Spacing;
                    newy += tsize;

                    if (y >= addy && y <= newy) {
                        this.SelectedIndex = i;
                        break;
                    }

                    addy =+ newy;
                }
                
                base.LeftMouseClick(x, y);
            }

            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);

                int addy = this.Padding;
                int slideradd = this.Padding;
                for (int i = 0; i < this.Slider.Value; i++) {
                    slideradd += this.Items[i].Ysize;
                    slideradd += this.Spacing;
                }

                this.maxitemstoshow = 0;
                this.toomuchcontent = this.Slider.Value > 0;
                for (int i = this.Slider.Value; i < this.Items.Count; i++) {
                    int tsize = this.Items[i].Ysize;
                    if (addy + tsize > this.Height) {
                        this.toomuchcontent = true;
                        break;
                    }

                    this.maxitemstoshow++;
                    if (i == this.SelectedIndex) {
                        MrAG.Draw.Box(this.X + this.Padding, this.Y + addy, this.Width - (this.Padding * 2), tsize, this.SelectedBackColor);
                    }
                    MrAG.Draw.Text(this.Items[i].text, this.X + this.Padding, this.Y + addy, i == this.SelectedIndex? this.SelectedTextColor : this.TextColor);

                    addy += this.Spacing;
                    addy += tsize;

                    if (ShowLines && i + 1 < this.Items.Count && addy + this.Items[i + 1].Ysize <= this.Height) {
                        MrAG.Draw.Box(this.X + this.Padding, this.Y + addy - (this.Spacing / 2) - (this.LineSize / 2), this.Width - (this.Padding * 2), this.LineSize, this.LineColor);
                    }
                }

                this.curshowing = this.maxitemstoshow;
                this.maxitemstoshow = this.Items.Count - this.maxitemstoshow;
                base.Draw();
            }
        }
    }
}