/*
 * Copyright (C) 2020 Christian Pierre MOMON <christian.momon@devinsy.fr>
 * 
 * This file is part of AgirStatool, simple key value database.
 * 
 * AgirStatool is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * AgirStatool 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with AgirStatool.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.april.agirstatool.core.pages;

import java.io.IOException;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

import org.apache.commons.codec.digest.DigestUtils;
import org.april.agirstatool.charts.DateCountList;
import org.april.agirstatool.core.AgirStatool;
import org.april.agirstatool.core.AgirStatoolException;
import org.april.agirstatool.core.AgirStatoolUtils;
import org.april.agirstatool.core.Project;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import fr.devinsy.strings.StringList;
import fr.devinsy.xidyn.utils.XidynUtils;

/**
 * The Class projectsRawPageBuilder.
 */
public class CreatedConcludedCountChartView
{
	private static Logger logger = LoggerFactory.getLogger(CreatedConcludedCountChartView.class);

	/**
	 * Builds the.
	 *
	 * @param projects
	 *            the projects
	 * @return the string
	 * @throws AgirStatoolException
	 *             the agir statool exception
	 */
	public static String build(final String title, final Project project) throws AgirStatoolException
	{
		String result;

		try
		{
			logger.info("Building created/concluded chart view…");

			if (project.hasIssue())
			{
				String source = XidynUtils.load(AgirStatool.class.getResource("/org/april/agirstatool/core/pages/chartLineView.xhtml"));
				String code = XidynUtils.extractBodyContent(source);

				code = code.replaceAll("myChart", "myChart_" + DigestUtils.md5Hex(title + "lineBar"));

				StringList labels = buildWeekLabels(project.issueStats().getFirstCreate().toLocalDate());
				code = code.replaceAll("labels: \\[.*\\]", "labels: " + AgirStatoolUtils.toJSonStrings(labels));

				StringList values = project.issueStats().getWeekCreatedIssueCounts().toValueList();
				code = code.replaceAll("data: \\[.*\\]", "data: " + AgirStatoolUtils.toJSonNumbers(values));

				values = project.issueStats().getWeekConcludedIssueCounts().toValueList();
				code = code.replaceAll("data: \\[.*\\] ", "data: " + AgirStatoolUtils.toJSonNumbers(values));

				result = code.toString();
			}
			else
			{
				result = "No issue.";
			}
		}
		catch (IOException exception)
		{
			throw new AgirStatoolException("Error building ProjectsRaw view: " + exception.getMessage(), exception);
		}

		//
		return result;
	}

	/**
	 * Builds the 3 months.
	 *
	 * @param title
	 *            the title
	 * @param project
	 *            the project
	 * @return the string
	 * @throws AgirStatoolException
	 *             the agir statool exception
	 */
	public static String build(final String title, final Project project, final int monthCount) throws AgirStatoolException
	{
		String result;

		try
		{
			logger.info("Building created/closed x months chart view…");

			if (project.hasIssue() && !project.getName().equals("*"))
			{
				String source = XidynUtils.load(AgirStatool.class.getResource("/org/april/agirstatool/core/pages/chartLineView.xhtml"));
				String code = XidynUtils.extractBodyContent(source);

				code = code.replaceAll("myChart", "myChart_" + DigestUtils.md5Hex(title + "lineChartXMonths"));

				LocalDate start = LocalDate.now().minusMonths(monthCount);
				LocalDate end = LocalDate.now();

				StringList labels = buildWeekLabels(start);
				code = code.replaceAll("labels: \\[.*\\]", "labels: " + AgirStatoolUtils.toJSonStrings(labels));

				DateCountList dates = project.issueStats().getWeekCreatedIssueCounts();
				StringList values = AgirStatoolUtils.normalizedWeekCountList(dates, start, end).toValueList();
				code = code.replaceAll("data: \\[.*\\]", "data: " + AgirStatoolUtils.toJSonNumbers(values));

				dates = project.issueStats().getWeekConcludedIssueCounts();
				values = AgirStatoolUtils.normalizedWeekCountList(dates, start, end).toValueList();
				code = code.replaceAll("data: \\[.*\\] ", "data: " + AgirStatoolUtils.toJSonNumbers(values));

				result = code.toString();
			}
			else
			{
				result = "No issue.";
			}
		}
		catch (IOException exception)
		{
			throw new AgirStatoolException("Error building ProjectsRaw view: " + exception.getMessage(), exception);
		}

		//
		return result;
	}

	/**
	 * Builds the week labels.
	 *
	 * @param start
	 *            the start
	 * @return the string list
	 */
	private static StringList buildWeekLabels(final LocalDate start)
	{
		StringList result;

		result = new StringList();

		if (start != null)
		{
			LocalDate end = AgirStatoolUtils.normaliseWeekDate(LocalDate.now());
			LocalDate date = AgirStatoolUtils.normaliseWeekDate(start);
			while (date.isBefore(end) || date.isEqual(end))
			{
				String label = date.format(DateTimeFormatter.ofPattern("yyyy-MMM"));
				result.add(label);
				date = date.plusWeeks(1);
			}
		}

		//
		return result;
	}
}