/*
 * Copyright 2013 gitblit.com.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.gitblit.wicket.pages;

import java.io.Serializable;
import java.text.DateFormat;
import java.text.MessageFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TimeZone;
import java.util.TreeSet;

import org.apache.wicket.PageParameters;
import org.apache.wicket.behavior.HeaderContributor;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.panel.Fragment;
import org.eclipse.jgit.lib.Repository;

import com.gitblit.GitBlit;
import com.gitblit.Keys;
import com.gitblit.models.DailyLogEntry;
import com.gitblit.models.Metric;
import com.gitblit.models.RefLogEntry;
import com.gitblit.models.RepositoryCommit;
import com.gitblit.models.RepositoryModel;
import com.gitblit.models.UserModel;
import com.gitblit.utils.ArrayUtils;
import com.gitblit.utils.RefLogUtils;
import com.gitblit.utils.StringUtils;
import com.gitblit.wicket.GitBlitWebApp;
import com.gitblit.wicket.PageRegistration;
import com.gitblit.wicket.PageRegistration.DropDownMenuItem;
import com.gitblit.wicket.PageRegistration.DropDownMenuRegistration;
import com.gitblit.wicket.charting.GoogleChart;
import com.gitblit.wicket.charting.GoogleCharts;
import com.gitblit.wicket.charting.GooglePieChart;
import com.gitblit.wicket.ng.NgController;
import com.gitblit.wicket.panels.DigestsPanel;
import com.gitblit.wicket.panels.LinkPanel;

public abstract class DashboardPage extends RootPage {

	public DashboardPage() {
		super();
	}

	public DashboardPage(PageParameters params) {
		super(params);
	}

	@Override
	protected boolean reusePageParameters() {
		return true;
	}

	protected void addActivity(UserModel user, Collection<RepositoryModel> repositories, String feedTitle, int daysBack) {
		Calendar c = Calendar.getInstance();
		c.add(Calendar.DATE, -1*daysBack);
		Date minimumDate = c.getTime();
		TimeZone timezone = getTimeZone();
		
		// create daily commit digest feed
		List<DailyLogEntry> digests = new ArrayList<DailyLogEntry>();
		for (RepositoryModel model : repositories) {
			Repository repository = GitBlit.self().getRepository(model.name);
			List<DailyLogEntry> entries = RefLogUtils.getDailyLogByRef(model.name, repository, minimumDate, timezone);
			digests.addAll(entries);
			repository.close();
		}
		
		Fragment activityFragment = new Fragment("activity", "activityFragment", this);
		add(activityFragment);
		activityFragment.add(new Label("feedTitle", feedTitle));
		if (digests.size() == 0) {
			// quiet or no starred repositories
			if (repositories.size() == 0) {
				if (UserModel.ANONYMOUS.equals(user)) {
					if (daysBack == 1) {
						activityFragment.add(new Label("digests", getString("gb.noActivityToday")));
					} else {
						activityFragment.add(new Label("digests", MessageFormat.format(getString("gb.noActivity"), daysBack)));
					}
				} else {
					activityFragment.add(new LinkPanel("digests", null, getString("gb.findSomeRepositories"), RepositoriesPage.class));
				}
			} else {
				if (daysBack == 1) {
					activityFragment.add(new Label("digests", getString("gb.noActivityToday")));
				} else {
					activityFragment.add(new Label("digests", MessageFormat.format(getString("gb.noActivity"), daysBack)));
				}
			}
		} else {
			// show daily commit digest feed
			Collections.sort(digests);
			DigestsPanel digestsPanel = new DigestsPanel("digests", digests);
			activityFragment.add(digestsPanel);
		}
		
		// add the nifty charts
		if (!ArrayUtils.isEmpty(digests)) {
			// aggregate author exclusions
			Set<String> authorExclusions = new TreeSet<String>();
			for (String author : GitBlit.getStrings(Keys.web.metricAuthorExclusions)) {
				authorExclusions.add(author.toLowerCase());
			}
			for (RepositoryModel model : repositories) {
				if (!ArrayUtils.isEmpty(model.metricAuthorExclusions)) {
					for (String author : model.metricAuthorExclusions) {
						authorExclusions.add(author.toLowerCase());
					}
				}
			}

			addCharts(activityFragment, digests, authorExclusions, daysBack);
		} else {
			activityFragment.add(new Label("charts").setVisible(false));
			activityFragment.add(new Label("feedheader").setVisible(false));
		}
	}
	
	protected Fragment createNgList(String wicketId, String fragmentId, String ngController, List<RepositoryModel> repositories) {
		String format = GitBlit.getString(Keys.web.datestampShortFormat, "MM/dd/yy");
		final DateFormat df = new SimpleDateFormat(format);
		df.setTimeZone(getTimeZone());

		Fragment fragment = new Fragment(wicketId, fragmentId, this);
		
		List<RepoListItem> list = new ArrayList<RepoListItem>();
		for (RepositoryModel repo : repositories) {
			String name = StringUtils.stripDotGit(repo.name); 
			String path = "";
			if (name.indexOf('/') > -1) {
				path = name.substring(0, name.lastIndexOf('/') + 1);
				name = name.substring(name.lastIndexOf('/') + 1);
			}
			
			RepoListItem item = new RepoListItem();
			item.n = name;
			item.p = path;
			item.r = repo.name;
			item.i = repo.description;
			item.s = GitBlit.self().getStarCount(repo);
			item.t = getTimeUtils().timeAgo(repo.lastChange);
			item.d = df.format(repo.lastChange);
			item.c = StringUtils.getColor(StringUtils.stripDotGit(repo.name));
			item.wc = repo.isBare ? 0 : 1;
			list.add(item);
		}
		
		// inject an AngularJS controller with static data
		NgController ctrl = new NgController(ngController);
		ctrl.addVariable(wicketId, list);
		add(new HeaderContributor(ctrl));
		
		return fragment;
	}

	@Override
	protected void addDropDownMenus(List<PageRegistration> pages) {
		PageParameters params = getPageParameters();

		DropDownMenuRegistration menu = new DropDownMenuRegistration("gb.filters",
				GitBlitWebApp.HOME_PAGE_CLASS);
		// preserve time filter option on repository choices
		menu.menuItems.addAll(getRepositoryFilterItems(params));

		// preserve repository filter option on time choices
		menu.menuItems.addAll(getTimeFilterItems(params));

		if (menu.menuItems.size() > 0) {
			// Reset Filter
			menu.menuItems.add(new DropDownMenuItem(getString("gb.reset"), null, null));
		}

		pages.add(menu);
	}


	/**
	 * Creates the daily activity line chart, the active repositories pie chart,
	 * and the active authors pie chart
	 * 
	 * @param recentChanges
	 * @param authorExclusions
	 * @param daysBack
	 */
	protected void addCharts(Fragment frag, List<DailyLogEntry> recentChanges, Set<String> authorExclusions, int daysBack) {
		// activity metrics
		Map<String, Metric> repositoryMetrics = new HashMap<String, Metric>();
		Map<String, Metric> authorMetrics = new HashMap<String, Metric>();

		// aggregate repository and author metrics
		int totalCommits = 0;
		for (RefLogEntry change : recentChanges) {

			// aggregate repository metrics
			String repository = StringUtils.stripDotGit(change.repository);
			if (!repositoryMetrics.containsKey(repository)) {
				repositoryMetrics.put(repository, new Metric(repository));
			}
			repositoryMetrics.get(repository).count += 1;
			
			for (RepositoryCommit commit : change.getCommits()) {
				totalCommits++;
				String author = StringUtils.removeNewlines(commit.getAuthorIdent().getName());
				String authorName = author.toLowerCase();
				String authorEmail = StringUtils.removeNewlines(commit.getAuthorIdent().getEmailAddress()).toLowerCase();
				if (!authorExclusions.contains(authorName) && !authorExclusions.contains(authorEmail)) {
					if (!authorMetrics.containsKey(author)) {
						authorMetrics.put(author, new Metric(author));
					}
					authorMetrics.get(author).count += 1;
				}
			}
		}
		
		String headerPattern;
		if (daysBack == 1) {
			// today
			if (totalCommits == 0) {
				headerPattern = getString("gb.todaysActivityNone");
			} else {
				headerPattern = getString("gb.todaysActivityStats");
			}
		} else {
			// multiple days
			if (totalCommits == 0) {
				headerPattern = getString("gb.recentActivityNone");
			} else {
				headerPattern = getString("gb.recentActivityStats");
			}
		}
		frag.add(new Label("feedheader", MessageFormat.format(headerPattern,
				daysBack, totalCommits, authorMetrics.size())));

		// build google charts
		GoogleCharts charts = new GoogleCharts();

		// active repositories pie chart
		GoogleChart chart = new GooglePieChart("chartRepositories", getString("gb.activeRepositories"),
				getString("gb.repository"), getString("gb.commits"));
		for (Metric metric : repositoryMetrics.values()) {
			chart.addValue(metric.name, metric.count);
		}
		chart.setShowLegend(false);
		charts.addChart(chart);

		// active authors pie chart
		chart = new GooglePieChart("chartAuthors", getString("gb.activeAuthors"),
				getString("gb.author"), getString("gb.commits"));
		for (Metric metric : authorMetrics.values()) {
			chart.addValue(metric.name, metric.count);
		}
		chart.setShowLegend(false);
		charts.addChart(chart);

		add(new HeaderContributor(charts));		
		frag.add(new Fragment("charts", "chartsFragment", this));
	}
	
	protected class RepoListItem implements Serializable {

		private static final long serialVersionUID = 1L;
		
		String r; // repository
		String n; // name
		String p; // project/path
		String t; // time ago
		String d; // last updated
		String i; // information/description
		long s; // stars
		String c; // html color
		int wc; // working copy, 1 = true
	}
}