/*
 * Copyright © 2004-2021 L2J Server
 * 
 * This file is part of L2J Server.
 * 
 * L2J Server is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * L2J Server is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.l2jserver.gameserver.util;

import java.util.Arrays;
import java.util.Collection;
import java.util.function.Function;

import com.l2jserver.gameserver.model.PageResult;

/**
 * A class containing useful methods for constructing HTML
 * @author NosBit
 */
public class HtmlUtil {
	/**
	 * Gets the HTML representation of CP gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @return the HTML
	 */
	public static String getCpGauge(int width, long current, long max, boolean displayAsPercentage) {
		return getGauge(width, current, max, displayAsPercentage, "L2UI_CT1.Gauges.Gauge_DF_Large_CP_bg_Center", "L2UI_CT1.Gauges.Gauge_DF_Large_CP_Center", 17, -13);
	}
	
	/**
	 * Gets the HTML representation of HP gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @return the HTML
	 */
	public static String getHpGauge(int width, long current, long max, boolean displayAsPercentage) {
		return getGauge(width, current, max, displayAsPercentage, "L2UI_CT1.Gauges.Gauge_DF_Large_HP_bg_Center", "L2UI_CT1.Gauges.Gauge_DF_Large_HP_Center", 17, -13);
	}
	
	/**
	 * Gets the HTML representation of HP Warn gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @return the HTML
	 */
	public static String getHpWarnGauge(int width, long current, long max, boolean displayAsPercentage) {
		return getGauge(width, current, max, displayAsPercentage, "L2UI_CT1.Gauges.Gauge_DF_Large_HPWarn_bg_Center", "L2UI_CT1.Gauges.Gauge_DF_Large_HPWarn_Center", 17, -13);
	}
	
	/**
	 * Gets the HTML representation of HP Fill gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @return the HTML
	 */
	public static String getHpFillGauge(int width, long current, long max, boolean displayAsPercentage) {
		return getGauge(width, current, max, displayAsPercentage, "L2UI_CT1.Gauges.Gauge_DF_Large_HPFill_bg_Center", "L2UI_CT1.Gauges.Gauge_DF_Large_HPFill_Center", 17, -13);
	}
	
	/**
	 * Gets the HTML representation of MP Warn gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @return the HTML
	 */
	public static String getMpGauge(int width, long current, long max, boolean displayAsPercentage) {
		return getGauge(width, current, max, displayAsPercentage, "L2UI_CT1.Gauges.Gauge_DF_Large_MP_bg_Center", "L2UI_CT1.Gauges.Gauge_DF_Large_MP_Center", 17, -13);
	}
	
	/**
	 * Gets the HTML representation of EXP Warn gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @return the HTML
	 */
	public static String getExpGauge(int width, long current, long max, boolean displayAsPercentage) {
		return getGauge(width, current, max, displayAsPercentage, "L2UI_CT1.Gauges.Gauge_DF_Large_EXP_bg_Center", "L2UI_CT1.Gauges.Gauge_DF_Large_EXP_Center", 17, -13);
	}
	
	/**
	 * Gets the HTML representation of Food gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @return the HTML
	 */
	public static String getFoodGauge(int width, long current, long max, boolean displayAsPercentage) {
		return getGauge(width, current, max, displayAsPercentage, "L2UI_CT1.Gauges.Gauge_DF_Large_Food_Bg_Center", "L2UI_CT1.Gauges.Gauge_DF_Large_Food_Center", 17, -13);
	}
	
	/**
	 * Gets the HTML representation of Weight gauge automatically changing level depending on current/max.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @return the HTML
	 */
	public static String getWeightGauge(int width, long current, long max, boolean displayAsPercentage) {
		return getWeightGauge(width, current, max, displayAsPercentage, Util.map(current, 0, max, 1, 5));
	}
	
	/**
	 * Gets the HTML representation of Weight gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @param level a number from 1 to 5 for the 5 different colors of weight gauge
	 * @return the HTML
	 */
	public static String getWeightGauge(int width, long current, long max, boolean displayAsPercentage, long level) {
		return getGauge(width, current, max, displayAsPercentage, "L2UI_CT1.Gauges.Gauge_DF_Large_Weight_bg_Center" + level, "L2UI_CT1.Gauges.Gauge_DF_Large_Weight_Center" + level, 17, -13);
	}
	
	/**
	 * Gets the HTML representation of a gauge.
	 * @param width the width
	 * @param current the current value
	 * @param max the max value
	 * @param displayAsPercentage if {@code true} the text in middle will be displayed as percent else it will be displayed as "current / max"
	 * @param backgroundImage the background image
	 * @param image the foreground image
	 * @param imageHeight the image height
	 * @param top the top adjustment
	 * @return the HTML
	 */
	private static String getGauge(int width, long current, long max, boolean displayAsPercentage, String backgroundImage, String image, long imageHeight, long top) {
		current = Math.min(current, max);
		final StringBuilder sb = new StringBuilder();
		StringUtil.append(sb, "<table width=", String.valueOf(width), " cellpadding=0 cellspacing=0><tr><td background=\"" + backgroundImage + "\">");
		StringUtil.append(sb, "<img src=\"" + image + "\" width=", String.valueOf((long) (((double) current / max) * width)), " height=", String.valueOf(imageHeight), ">");
		StringUtil.append(sb, "</td></tr><tr><td align=center><table cellpadding=0 cellspacing=", String.valueOf(top), "><tr><td>");
		if (displayAsPercentage) {
			StringUtil.append(sb, "<table cellpadding=0 cellspacing=2><tr><td>", String.format("%.2f%%", ((double) current / max) * 100), "</td></tr></table>");
		} else {
			final String tdWidth = String.valueOf((width - 10) / 2);
			StringUtil.append(sb, "<table cellpadding=0 cellspacing=0><tr><td width=" + tdWidth + " align=right>", String.valueOf(current), "</td>");
			StringUtil.append(sb, "<td width=10 align=center>/</td><td width=" + tdWidth + ">", String.valueOf(max), "</td></tr></table>");
		}
		StringUtil.append(sb, "</td></tr></table></td></tr></table>");
		return sb.toString();
	}
	
	public static <T> PageResult createPage(Collection<T> elements, int page, int elementsPerPage, Function<Integer, String> pagerFunction, Function<T, String> bodyFunction) {
		return createPage(elements, elements.size(), page, elementsPerPage, pagerFunction, bodyFunction);
	}
	
	public static <T> PageResult createPage(T[] elements, int page, int elementsPerPage, Function<Integer, String> pagerFunction, Function<T, String> bodyFunction) {
		return createPage(Arrays.asList(elements), elements.length, page, elementsPerPage, pagerFunction, bodyFunction);
	}
	
	public static <T> PageResult createPage(Iterable<T> elements, int size, int page, int elementsPerPage, Function<Integer, String> pagerFunction, Function<T, String> bodyFunction) {
		int pages = size / elementsPerPage;
		if ((elementsPerPage * pages) < size) {
			pages++;
		}
		
		final StringBuilder pagerTemplate = new StringBuilder();
		if (pages > 1) {
			int breakit = 0;
			for (int i = 0; i < pages; i++) {
				pagerTemplate.append(pagerFunction.apply(i));
				breakit++;
				
				if (breakit > 5) {
					pagerTemplate.append("</tr><tr>");
					breakit = 0;
				}
			}
		}
		
		if (page >= pages) {
			page = pages - 1;
		}
		
		int start = 0;
		if (page > 0) {
			start = elementsPerPage * page;
		}
		
		final StringBuilder sb = new StringBuilder();
		int i = 0;
		for (T element : elements) {
			if (i++ < start) {
				continue;
			}
			
			sb.append(bodyFunction.apply(element));
			
			if (i >= (elementsPerPage + start)) {
				break;
			}
		}
		return new PageResult(pages, pagerTemplate, sb);
	}
}
