using System;
using System.Collections.Generic;
using Coroutine;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Font;
using MLEM.Input;
using MLEM.Startup;
using MLEM.Textures;
using MLEM.Ui;
using MLEM.Ui.Elements;
using MLEM.Ui.Style;

namespace Examples {
    public class GameImpl : MlemGame {

        private Texture2D testTexture;
        private NinePatch testPatch;

        public GameImpl() {
            this.IsMouseVisible = true;
        }

        protected override void LoadContent() {
            this.testTexture = LoadContent<Texture2D>("Textures/Test");
            this.testPatch = new NinePatch(new TextureRegion(this.testTexture, 0, 8, 24, 24), 8);
            base.LoadContent();

            var style = new UntexturedStyle(this.SpriteBatch) {
                Font = new GenericSpriteFont(LoadContent<SpriteFont>("Fonts/TestFont")),
                TextScale = 0.1F,
                PanelTexture = this.testPatch,
                ButtonTexture = new NinePatch(new TextureRegion(this.testTexture, 24, 8, 16, 16), 4),
                TextFieldTexture = new NinePatch(new TextureRegion(this.testTexture, 24, 8, 16, 16), 4),
                ScrollBarBackground = new NinePatch(new TextureRegion(this.testTexture, 8, 0, 4, 8), 1, 1, 2, 2),
                ScrollBarScrollerTexture = new NinePatch(new TextureRegion(this.testTexture, 12, 0, 4, 8), 1, 1, 2, 2),
                CheckboxTexture = new NinePatch(new TextureRegion(this.testTexture, 24, 8, 16, 16), 4),
                CheckboxCheckmark = new TextureRegion(this.testTexture, 24, 0, 8, 8),
                RadioTexture = new NinePatch(new TextureRegion(this.testTexture, 16, 0, 8, 8), 3),
                RadioCheckmark = new TextureRegion(this.testTexture, 32, 0, 8, 8)
            };
            var untexturedStyle = this.UiSystem.Style;
            this.UiSystem.Style = style;
            this.UiSystem.GlobalScale = 5;

            var root = new Panel(Anchor.Center, new Vector2(80, 100), Point.Zero, false, true, new Point(5, 10));
            this.UiSystem.Add("Test", root);

            root.AddChild(new Paragraph(Anchor.AutoLeft, 1, "This is a small demo for MLEM.Ui, a user interface library that is part of (M)LEM (L)ibrary by (E)llpeck for (M)onoGame."));
            var image = root.AddChild(new Image(Anchor.AutoCenter, new Vector2(20, 20), new TextureRegion(this.testTexture, 0, 0, 8, 8)) {IsHidden = true});
            root.AddChild(new Button(Anchor.AutoCenter, new Vector2(1, 10), "Toggle Image") {
                OnClicked = (element, button) => {
                    if (button == MouseButton.Left)
                        image.IsHidden = !image.IsHidden;
                }
            });
            root.AddChild(new Button(Anchor.AutoCenter, new Vector2(1, 10), "Change Style") {
                OnClicked = (element, button) => {
                    if (button == MouseButton.Left)
                        this.UiSystem.Style = this.UiSystem.Style == untexturedStyle ? style : untexturedStyle;
                },
                PositionOffset = new Point(0, 1),
                HasCustomStyle = true,
                Texture = this.testPatch,
                HoveredColor = Color.LightGray
            });

            root.AddChild(new VerticalSpace(3));
            root.AddChild(new Paragraph(Anchor.AutoCenter, 1, "Text input:", true));
            root.AddChild(new TextField(Anchor.AutoLeft, new Vector2(1, 10)) {PositionOffset = new Point(0, 1)});

            root.AddChild(new VerticalSpace(3));
            root.AddChild(new Paragraph(Anchor.AutoLeft, 1, "Zoom in or out:"));
            root.AddChild(new Button(Anchor.AutoLeft, new Vector2(10), "+") {
                OnClicked = (element, button) => {
                    if (element.Root.Scale < 2)
                        element.Root.Scale += 0.1F;
                }
            });
            root.AddChild(new Button(Anchor.AutoInline, new Vector2(10), "-") {
                OnClicked = (element, button) => {
                    if (element.Root.Scale > 0.5F)
                        element.Root.Scale -= 0.1F;
                },
                PositionOffset = new Point(1, 0)
            });

            root.AddChild(new VerticalSpace(3));
            root.AddChild(new Checkbox(Anchor.AutoLeft, new Vector2(1, 10), "Checkbox 1!"));
            root.AddChild(new Checkbox(Anchor.AutoLeft, new Vector2(1, 10), "Checkbox 2!") {PositionOffset = new Point(0, 1)});

            root.AddChild(new VerticalSpace(3));
            root.AddChild(new RadioButton(Anchor.AutoLeft, new Vector2(1, 10), "Radio button 1!"));
            root.AddChild(new RadioButton(Anchor.AutoLeft, new Vector2(1, 10), "Radio button 2!") {PositionOffset = new Point(0, 1)});
        }

        protected override void Draw(GameTime gameTime) {
            this.GraphicsDevice.Clear(Color.Black);
            base.Draw(gameTime);
        }

    }
}