/*
 * 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;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.Locale;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.april.agirstatool.charts.DateCount;
import org.april.agirstatool.charts.DateCountList;
import org.april.agirstatool.charts.DateCountMap;
import org.april.agirstatool.core.pages.ProjectPage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import fr.devinsy.strings.StringList;
import fr.devinsy.strings.StringsUtils;

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

	public static final DateTimeFormatter PATTERN_SHORTDATE = DateTimeFormatter.ofPattern("dd/MM/yyyy", Locale.FRANCE);
	public static final DateTimeFormatter PATTERN_LONGDATE = DateTimeFormatter.ofPattern("dd/MM/yyyy hh':'mm", Locale.FRANCE);

	public static StringList buildWeekDuration(final Project project, final LocalDate start, final LocalDate end)
	{
		StringList result;

		result = new StringList();

		if (start != null)
		{
			Issues issues = new Issues();
			issues.addAll(project.issues());
			issues.sort(IssueComparator.Sorting.CLOSEDON);

			LocalDate date = AgirStatoolUtils.normaliseWeekDate(start);
			LocalDate normalizedEnd = AgirStatoolUtils.normaliseWeekDate(end);
			while (!date.isAfter(normalizedEnd))
			{
				Stat stat = project.issues().extractActivedAt(date).computeStat(date);

				result.add(String.format(Locale.ENGLISH, "%.2f", stat.getMean()));

				//
				date = date.plusWeeks(1);
			}
		}

		//
		return result;
	}

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

		result = buildWeekLabels(start, LocalDate.now());

		//
		return result;
	}

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

		result = new StringList();

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

		//
		return result;
	}

	/**
	 * Builds the week max ages.
	 *
	 * @param project
	 *            the project
	 * @param start
	 *            the start
	 * @param end
	 *            the end
	 * @return the string list
	 */
	public static StringList buildWeekMaxAges(final Project project, final LocalDate start, final LocalDate end)
	{
		StringList result;

		result = new StringList();

		if (start != null)
		{
			LocalDate date = AgirStatoolUtils.normaliseWeekDate(start);
			LocalDate normalizedEnd = AgirStatoolUtils.normaliseWeekDate(end);
			while (date.isBefore(normalizedEnd) || date.isEqual(normalizedEnd))
			{
				Stat stat = project.issues().extractActivedAt(date).computeStat(date);

				result.add(String.valueOf(stat.getMax()));

				//
				date = date.plusWeeks(1);
			}
		}

		//
		return result;
	}

	/**
	 * Builds the week mean ages.
	 *
	 * @param project
	 *            the project
	 * @param start
	 *            the start
	 * @param end
	 *            the end
	 * @return the string list
	 */
	public static StringList buildWeekMeanAges(final Project project, final LocalDate start, final LocalDate end)
	{
		StringList result;

		result = new StringList();

		if (start != null)
		{
			LocalDate date = AgirStatoolUtils.normaliseWeekDate(start);
			LocalDate normalizedEnd = AgirStatoolUtils.normaliseWeekDate(end);
			while (date.isBefore(normalizedEnd) || date.isEqual(normalizedEnd))
			{
				Stat stat = project.issues().extractActivedAt(date).computeStat(date);

				result.add(String.format(Locale.ENGLISH, "%.2f", stat.getMean()));

				//
				date = date.plusWeeks(1);
			}
		}

		//
		return result;
	}

	/**
	 * Builds the week min ages.
	 *
	 * @param project
	 *            the project
	 * @param start
	 *            the start
	 * @param end
	 *            the end
	 * @return the string list
	 */
	public static StringList buildWeekMinAges(final Project project, final LocalDate start, final LocalDate end)
	{
		StringList result;

		result = new StringList();

		if (start != null)
		{
			LocalDate date = AgirStatoolUtils.normaliseWeekDate(start);
			LocalDate normalizedEnd = AgirStatoolUtils.normaliseWeekDate(end);
			while (date.isBefore(normalizedEnd) || date.isEqual(normalizedEnd))
			{
				Stat stat = project.issues().extractActivedAt(date).computeStat(date);

				result.add(String.valueOf(stat.getMin()));

				//
				date = date.plusWeeks(1);
			}
		}

		//
		return result;
	}

	/**
	 * Normalise week date.
	 *
	 * @param source
	 *            the source
	 * @return the local date
	 */
	public static LocalDate normaliseWeekDate(final LocalDate source)
	{
		LocalDate result;

		if (source == null)
		{
			result = source;
		}
		else
		{
			result = source.minusDays(source.getDayOfWeek().getValue() - 1);
		}

		//
		return result;
	}

	/**
	 * Normalized week count list.
	 *
	 * @param source
	 *            the source
	 * @param start
	 *            the start
	 * @param end
	 *            the end
	 * @return the date count list
	 */
	public static DateCountList normalizedWeekCountList(final DateCountList source, final LocalDate start, final LocalDate end)
	{
		DateCountList result;

		result = new DateCountList();

		LocalDate normalizedEnd = normaliseWeekDate(end);
		LocalDate date = normaliseWeekDate(start);
		int index = source.indexOf(toYearWeek(start));
		if (index == -1)
		{
			index = 0;
		}
		while (date.isBefore(normalizedEnd) || date.isEqual(normalizedEnd))
		{
			String dateToken = toYearWeek(date);
			long count;
			if (index < source.size())
			{
				DateCount current = source.get(index);
				// AgirStatoolUtils.logger.info("===> " + dateToken + " " +
				// current.getDate());
				if (StringUtils.equals(current.getDate(), dateToken))
				{
					count = current.getCount();
					index += 1;
				}
				else
				{
					count = 0;
				}
			}
			else
			{
				count = 0;
			}
			result.add(new DateCount(dateToken, count));
			date = date.plusWeeks(1);
		}

		//
		return result;
	}

	/**
	 * Builds the week created count list.
	 *
	 * @param source
	 *            the source
	 * @param start
	 *            the start
	 * @return the date count list
	 */
	public static DateCountList normalizedWeekCountList(final DateCountMap source, final LocalDate start)
	{
		DateCountList result;

		result = new DateCountList();

		LocalDate date = normaliseWeekDate(start);
		LocalDate end = normaliseWeekDate(LocalDate.now());
		long count = 0;
		while (date.isBefore(end) || date.isEqual(end))
		{
			String dateToken = toYearWeek(date);
			DateCount current = source.get(dateToken);
			if (current != null)
			{
				count += current.getCount();
			}
			result.add(new DateCount(dateToken, count));
			date = date.plusWeeks(1);
		}

		//
		return result;
	}

	/**
	 * Gets the current time in long format.
	 * 
	 * @return the long
	 */
	public static long now()
	{
		return new Date().getTime();
	}

	/**
	 * Select stat indicator.
	 *
	 * @param value
	 *            the value
	 * @return the string
	 */
	public static String selectStatIndicator(final long value)
	{
		String result;

		if (value < 10)
		{
			result = null;
		}
		else if (value < 20)
		{
			result = "caution";
		}
		else if (value < 50)
		{
			result = "warning";
		}
		else
		{
			result = "alert";
		}

		//
		return result;
	}

	/**
	 * Select unassigned indicator.
	 *
	 * @param value
	 *            the value
	 * @return the string
	 */
	public static String selectUnassignedIndicator(final long value)
	{
		String result;

		if (value == 0)
		{
			result = null;
		}
		else
		{
			result = "alert";
		}

		//
		return result;
	}

	/**
	 * To human long.
	 *
	 * @param value
	 *            the value
	 * @return the string
	 */
	public static String toHumanLong(final LocalDateTime value)
	{
		String result;

		result = toHumanLong(value, null);

		//
		return result;
	}

	/**
	 * To human long.
	 *
	 * @param value
	 *            the value
	 * @param defaultValue
	 *            the default value
	 * @return the string
	 */
	public static String toHumanLong(final LocalDateTime value, final String defaultValue)
	{
		String result;

		if (value == null)
		{
			result = null;
		}
		else
		{
			result = value.format(PATTERN_LONGDATE);
		}

		//
		return result;
	}

	/**
	 * To human short.
	 *
	 * @param value
	 *            the value
	 * @return the string
	 */
	public static String toHumanShort(final LocalDateTime value)
	{
		String result;

		result = toHumanShort(value, null);

		//
		return result;
	}

	/**
	 * To human short.
	 *
	 * @param value
	 *            the value
	 * @param defaultValue
	 *            the default value
	 * @return the string
	 */
	public static String toHumanShort(final LocalDateTime value, final String defaultValue)
	{
		String result;

		if (value == null)
		{
			result = null;
		}
		else
		{
			result = value.format(PATTERN_SHORTDATE);
		}

		//
		return result;
	}

	public static Integer toInteger(final String value)
	{
		Integer result;

		if ((value == null) || (!NumberUtils.isDigits(value)))
		{
			result = null;
		}
		else
		{
			result = Integer.parseInt(value);
		}

		//
		return result;
	}

	/**
	 * To Json numbers.
	 *
	 * @param source
	 *            the source
	 * @return the string
	 */
	public static String toJSonNumbers(final StringList source)
	{
		String result;

		result = StringsUtils.toString(source, "[", ",", "]");

		//
		return result;
	}

	/**
	 * To Json strings.
	 *
	 * @param source
	 *            the source
	 * @return the string
	 */
	public static String toJSonStrings(final StringList source)
	{
		String result;

		StringList target = new StringList();

		target.append("[");
		for (String string : source)
		{
			target.append("'");
			target.append(string);
			target.append("'");
			target.append(",");
		}
		target.removeLast();
		target.append("]");

		result = target.toString();

		//
		return result;
	}

	/**
	 * To year week.
	 *
	 * @param source
	 *            the source
	 * @return the string
	 */
	public static String toYearWeek(final LocalDate source)
	{
		String result;

		if (source == null)
		{
			result = null;
		}
		else
		{
			result = source.format(DateTimeFormatter.ofPattern("yyyyww", Locale.FRANCE));
		}

		//
		return result;
	}
}