// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
using System;
using System.Drawing;
using OpenTK.Input;
#if ANDROID
using Android.Graphics;
#endif

namespace ClassicalSharp.Gui.Widgets {
	public sealed partial class AltTextInputWidget : Widget {

		public AltTextInputWidget(Game game, Font font, InputWidget input) : base(game) {
			HorizontalAnchor = Anchor.LeftOrTop;
			VerticalAnchor = Anchor.BottomOrRight;
			this.font = font;
			this.input = input;
			Active = false;
		}
		
		public void UpdateColours() {
			elements[0] = new Element("Colours", 10, 4, GetColourString());
			Redraw();
			SetActive(Active);
		}
		
		public Texture texture;
		readonly Font font;
		InputWidget input;
		Size elementSize;
		
		public void SetActive(bool active) {
			Active = active;
			Height = active ? texture.Height : 0;
		}
		
		public override void Render(double delta) {
			texture.Render(gfx);
		}
		
		public override void Init() {
			X = 5; Y = 5;
			InitData();
			Redraw();
			SetActive(Active);
		}

		public void Redraw() {
			Make(elements[selectedIndex], font);
			Width = texture.Width;
			Height = texture.Height;
		}
		
		unsafe void Make(Element e, Font font) {
			Size* sizes = stackalloc Size[e.Contents.Length / e.CharsPerItem];
			MeasureContentSizes(e, font, sizes);
			Size bodySize = CalculateContentSize(e, sizes, out elementSize);
			int titleWidth = MeasureTitles(font), titleHeight = elements[0].TitleSize.Height;
			Size size = new Size(Math.Max(bodySize.Width, titleWidth), bodySize.Height + titleHeight);
			game.Graphics.DeleteTexture(ref texture);
			
			using (Bitmap bmp = IDrawer2D.CreatePow2Bitmap(size))
				using (IDrawer2D drawer = game.Drawer2D)
			{
				drawer.SetBitmap(bmp);
				DrawTitles(drawer, font);
				drawer.Clear(new FastColour(30, 30, 30, 200), 0, titleHeight,
				             size.Width, bodySize.Height);
				
				DrawContent(drawer, font, e, titleHeight);
				texture = drawer.Make2DTexture(bmp, size, X, Y);
			}
		}
		
		int selectedIndex = 0;
		public override bool HandlesMouseClick(int mouseX, int mouseY, MouseButton button) {
			mouseX -= X; mouseY -= Y;
			if (IntersectsHeader(mouseX, mouseY)) {
				Redraw();
			} else {
				IntersectsBody(mouseX, mouseY);
			}
			return true;
		}
		
		bool IntersectsHeader(int widgetX, int widgetY) {
			Rectangle bounds = new Rectangle(0, 0, 0, 0);
			for (int i = 0; i < elements.Length; i++) {
				Size size = elements[i].TitleSize;
				bounds.Width = size.Width; bounds.Height = size.Height;
				if (bounds.Contains(widgetX, widgetY)) {
					selectedIndex = i;
					return true;
				}
				bounds.X += size.Width;
			}
			return false;
		}
		
		void IntersectsBody(int widgetX, int widgetY) {
			widgetY -= elements[0].TitleSize.Height;
			widgetX /= elementSize.Width; widgetY /= elementSize.Height;
			Element e = elements[selectedIndex];
			int index = widgetY * e.ItemsPerRow + widgetX;
			if (index * e.CharsPerItem < e.Contents.Length) {
				if (selectedIndex == 0) {
					// TODO: need to insert characters that don't affect caret index, adjust caret colour
					input.Append(e.Contents[index * e.CharsPerItem]);
					input.Append(e.Contents[index * e.CharsPerItem + 1]);
				} else {
					input.Append(e.Contents[index]);
				}
			}
		}

		public override void Dispose() {
			gfx.DeleteTexture(ref texture);
		}
	}
}