// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
using System;
using System.Collections.Generic;
using System.Drawing;

namespace ClassicalSharp.Gui.Widgets {
	public sealed partial class TextGroupWidget : Widget {
		
		public TextGroupWidget(Game game, int elementsCount, Font font, Font underlineFont) : base(game) {
			ElementsCount = elementsCount;
			this.font = font;
			this.underlineFont = underlineFont;
		}
		
		public TextGroupWidget SetLocation(Anchor horAnchor, Anchor verAnchor, int xOffset, int yOffset) {
			HorizontalAnchor = horAnchor; VerticalAnchor = verAnchor;
			XOffset = xOffset; YOffset = yOffset;
			CalculatePosition();
			return this;
		}
		
		public Texture[] Textures;
		public bool[] PlaceholderHeight;
		internal string[] lines;
		LinkData[] linkData;
		int ElementsCount, defaultHeight;
		readonly Font font, underlineFont;
		
		public override void Init() {
			Textures = new Texture[ElementsCount];
			PlaceholderHeight = new bool[ElementsCount];
			lines = new string[ElementsCount];
			linkData = new LinkData[ElementsCount];
			
			DrawTextArgs args = new DrawTextArgs("I", font, true);
			int height = game.Drawer2D.MeasureChatSize(ref args).Height;
			game.Drawer2D.ReducePadding(ref height, Utils.Floor(font.Size), 3);
			defaultHeight = height;
			
			for (int i = 0; i < Textures.Length; i++) {
				Textures[i].Height = (short)defaultHeight;
				PlaceholderHeight[i] = true;
			}
			UpdateDimensions();
		}
		
		public void SetUsePlaceHolder(int index, bool placeHolder) {
			PlaceholderHeight[index] = placeHolder;
			if (Textures[index].ID > 0) return;
			
			int newHeight = placeHolder ? defaultHeight : 0;
			Textures[index].Y1 = CalcY(index, newHeight);
			Textures[index].Height = (short)newHeight;
		}
		
		public void PushUpAndReplaceLast(string text) {
			int y = Y;
			gfx.DeleteTexture(ref Textures[0]);
			for (int i = 0; i < Textures.Length - 1; i++) {
				Textures[i] = Textures[i + 1];
				lines[i] = lines[i + 1];
				Textures[i].Y1 = y;
				y += Textures[i].Height;
				linkData[i] = linkData[i + 1];
			}
			
			linkData[Textures.Length - 1] = default(LinkData);
			Textures[Textures.Length - 1].ID = 0; // Delete() is called by SetText otherwise.
			SetText(Textures.Length - 1, text);
		}
		
		int CalcY(int index, int newHeight) {
			int y = 0;
			int deltaY = newHeight - Textures[index].Height;
			
			if (VerticalAnchor == Anchor.LeftOrTop) {
				y = Y;
				for (int i = 0; i < index; i++)
					y += Textures[i].Height;
				for (int i = index + 1; i < Textures.Length; i++)
					Textures[i].Y1 += deltaY;
			} else {
				y = game.Height - YOffset;
				for (int i = index + 1; i < Textures.Length; i++)
					y -= Textures[i].Height;
				
				y -= newHeight;
				for (int i = 0; i < index; i++)
					Textures[i].Y1 -= deltaY;
			}
			return y;
		}
		
		public int GetUsedHeight() {
			int sum = 0;
			for (int i = 0; i < Textures.Length; i++) {
				if (!Textures[i].IsValid) continue;
				sum += Textures[i].Height;
			}
			return sum;
		}
		
		void UpdateDimensions() {
			Width = 0;
			Height = 0;
			for (int i = 0; i < Textures.Length; i++) {
				Width = Math.Max(Width, Textures[i].Width);
				Height += Textures[i].Height;
			}
			CalculatePosition();
		}
		
		public override void Render(double delta) {
			for (int i = 0; i < Textures.Length; i++) {
				Texture texture = Textures[i];
				if (texture.IsValid)
					texture.Render(gfx);
			}
		}
		
		public override void Dispose() {
			for (int i = 0; i < Textures.Length; i++)
				gfx.DeleteTexture(ref Textures[i]);
		}
		
		public override void CalculatePosition() {
			int oldY = Y;
			base.CalculatePosition();
			if (Textures == null) return;
			
			for (int i = 0; i < Textures.Length; i++) {
				Textures[i].X1 = CalcPos(HorizontalAnchor, XOffset, Textures[i].Width, game.Width);
				Textures[i].Y1 += Y - oldY;
			}
		}
		
		public string GetSelected(int mouseX, int mouseY) {
			for (int i = 0; i < Textures.Length; i++) {
				Texture tex = Textures[i];
				if (tex.IsValid && tex.Bounds.Contains(mouseX, mouseY))
					return GetUrl(i, mouseX) ?? lines[i];
			}
			return null;
		}
		
		string GetUrl(int index, int mouseX) {
			Rectangle[] partBounds = linkData[index].bounds;
			if (partBounds == null) return null;
			Texture tex = Textures[index];
			mouseX -= tex.X1;
			
			for (int i = 1; i < partBounds.Length; i += 2) {
				if (mouseX >= partBounds[i].Left && mouseX < partBounds[i].Right)
					return linkData[index].urls[i];
			}
			return null;
		}
	}
}