/*
 * Copyright 2011 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.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.wicket.Component;
import org.apache.wicket.PageParameters;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.StatelessForm;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.markup.html.link.BookmarkablePageLink;
import org.apache.wicket.markup.html.link.ExternalLink;
import org.apache.wicket.markup.html.panel.Fragment;
import org.apache.wicket.markup.repeater.Item;
import org.apache.wicket.markup.repeater.data.DataView;
import org.apache.wicket.markup.repeater.data.ListDataProvider;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.eclipse.jgit.diff.DiffEntry.ChangeType;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;

import com.gitblit.GitBlit;
import com.gitblit.Keys;
import com.gitblit.SyndicationServlet;
import com.gitblit.models.RepositoryModel;
import com.gitblit.utils.JGitUtils;
import com.gitblit.utils.JGitUtils.SearchType;
import com.gitblit.utils.StringUtils;
import com.gitblit.utils.TicgitUtils;
import com.gitblit.wicket.GitBlitWebSession;
import com.gitblit.wicket.WicketUtils;
import com.gitblit.wicket.panels.LinkPanel;
import com.gitblit.wicket.panels.RefsPanel;

public abstract class RepositoryPage extends BasePage {

	protected final String repositoryName;
	protected final String objectId;

	private transient Repository r;

	private RepositoryModel m;

	private final Map<String, PageRegistration> registeredPages = new HashMap<String, PageRegistration>() {

		private static final long serialVersionUID = 1L;

		{
			put("repositories", new PageRegistration("gb.repositories", RepositoriesPage.class, false));
			put("summary", new PageRegistration("gb.summary", SummaryPage.class));
			put("log", new PageRegistration("gb.log", LogPage.class));
			put("branches", new PageRegistration("gb.branches", BranchesPage.class));
			put("tags", new PageRegistration("gb.tags", TagsPage.class));
			put("tree", new PageRegistration("gb.tree", TreePage.class));
			put("tickets", new PageRegistration("gb.tickets", TicketsPage.class));
			put("edit", new PageRegistration("gb.edit", EditRepositoryPage.class));
			put("docs", new PageRegistration("gb.docs", DocsPage.class));
		}
	};

	public RepositoryPage(PageParameters params) {
		super(params);
		repositoryName = WicketUtils.getRepositoryName(params);
		objectId = WicketUtils.getObject(params);

		if (StringUtils.isEmpty(repositoryName)) {
			error(MessageFormat.format("Repository not specified for {0}!", getPageName()), true);
		}

		Repository r = getRepository();
		RepositoryModel model = getRepositoryModel();

		// standard page links
		addRegisteredPageLink("repositories");
		addRegisteredPageLink("summary");
		addRegisteredPageLink("log");
		addRegisteredPageLink("branches");
		addRegisteredPageLink("tags");
		addRegisteredPageLink("tree");

		// per-repository extra page links
		List<String> extraPageLinks = new ArrayList<String>();
		if (model.useTickets && TicgitUtils.getTicketsBranch(r) != null) {
			extraPageLinks.add("tickets");
		}
		if (model.useDocs) {
			extraPageLinks.add("docs");
		}

		final boolean showAdmin;
		if (GitBlit.getBoolean(Keys.web.authenticateAdminPages, true)) {
			boolean allowAdmin = GitBlit.getBoolean(Keys.web.allowAdministration, false);
			showAdmin = allowAdmin && GitBlitWebSession.get().canAdmin();
		} else {
			showAdmin = GitBlit.getBoolean(Keys.web.allowAdministration, false);
		}

		// Conditionally add edit link
		if (showAdmin
				|| GitBlitWebSession.get().isLoggedIn()
				&& (model.owner != null && model.owner.equalsIgnoreCase(GitBlitWebSession.get()
						.getUser().username))) {
			extraPageLinks.add("edit");
		}

		final String pageName = getPageName();
		final String pageWicketId = getLinkWicketId(pageName);
		ListDataProvider<String> extrasDp = new ListDataProvider<String>(extraPageLinks);
		DataView<String> extrasView = new DataView<String>("extra", extrasDp) {
			private static final long serialVersionUID = 1L;

			public void populateItem(final Item<String> item) {
				String extra = item.getModelObject();
				PageRegistration pageReg = registeredPages.get(extra);
				item.add(new LinkPanel("extraLink", null, getString(pageReg.translationKey),
						pageReg.pageClass, WicketUtils.newRepositoryParameter(repositoryName)));
			}
		};
		add(extrasView);

		add(new ExternalLink("syndication", SyndicationServlet.asLink(getRequest()
				.getRelativePathPrefixToContextRoot(), repositoryName, null, 0)));

		// disable current page
		disableRegisteredPageLink(pageName);

		// add floating search form
		SearchForm searchForm = new SearchForm("searchForm", repositoryName);
		add(searchForm);
		searchForm.setTranslatedAttributes();

		// set stateless page preference
		setStatelessHint(true);
	}
	
	@Override
	protected void setupPage(String repositoryName, String pageName) {
		add(new LinkPanel("repositoryName", null, repositoryName, SummaryPage.class,
				WicketUtils.newRepositoryParameter(repositoryName)));
		add(new Label("pageName", pageName));

		super.setupPage(repositoryName, pageName);
	}

	public String getLinkWicketId(String pageName) {
		for (String wicketId : registeredPages.keySet()) {
			String key = registeredPages.get(wicketId).translationKey;
			String linkName = getString(key);
			if (linkName.equals(pageName)) {
				return wicketId;
			}
		}
		return null;
	}

	public void disableRegisteredPageLink(String pageName) {
		String wicketId = getLinkWicketId(pageName);
		if (!StringUtils.isEmpty(wicketId)) {
			Component c = get(wicketId);
			if (c != null) {
//				c.setEnabled(false);
//				WicketUtils.setCssClass(c, "selected");
			}
		}
	}

	private void addRegisteredPageLink(String key) {
		PageRegistration pageReg = registeredPages.get(key);
		if (pageReg.repositoryLink) {
			add(new BookmarkablePageLink<Void>(key, pageReg.pageClass,
					WicketUtils.newRepositoryParameter(repositoryName)));
		} else {
			add(new BookmarkablePageLink<Void>(key, pageReg.pageClass));
		}
	}

	protected void addSyndicationDiscoveryLink() {
		add(WicketUtils.syndicationDiscoveryLink(SyndicationServlet.getTitle(repositoryName,
				objectId), SyndicationServlet.asLink(getRequest()
				.getRelativePathPrefixToContextRoot(), repositoryName, objectId, 0)));
	}

	protected Repository getRepository() {
		if (r == null) {
			Repository r = GitBlit.self().getRepository(repositoryName);
			if (r == null) {
				error("Can not load repository " + repositoryName, true);
				return null;
			}
			this.r = r;
		}
		return r;
	}

	protected RepositoryModel getRepositoryModel() {
		if (m == null) {
			RepositoryModel model = GitBlit.self().getRepositoryModel(
					GitBlitWebSession.get().getUser(), repositoryName);
			if (model == null) {
				authenticationError("Unauthorized access for repository " + repositoryName);
				return null;
			}
			m = model;
		}
		return m;
	}

	protected RevCommit getCommit() {
		RevCommit commit = JGitUtils.getCommit(r, objectId);
		if (commit == null) {
			error(MessageFormat.format("Failed to find commit \"{0}\" in {1} for {2} page!",
					objectId, repositoryName, getPageName()), true);
		}
		return commit;
	}

	protected String getShortObjectId(String objectId) {
		return objectId.substring(0, 8);
	}

	protected void addRefs(Repository r, RevCommit c) {
		add(new RefsPanel("refsPanel", repositoryName, c, JGitUtils.getAllRefs(r)));
	}

	protected void addFullText(String wicketId, String text, boolean substituteRegex) {
		String html;
		if (substituteRegex) {
			html = GitBlit.self().processCommitMessage(repositoryName, text);
		} else {
			html = StringUtils.breakLinesForHtml(text);
		}
		add(new Label(wicketId, html).setEscapeModelStrings(false));
	}

	protected abstract String getPageName();

	protected Component createPersonPanel(String wicketId, PersonIdent identity,
			SearchType searchType) {
		boolean showEmail = GitBlit.getBoolean(Keys.web.showEmailAddresses, false);
		if (!showEmail || StringUtils.isEmpty(identity.getName())
				|| StringUtils.isEmpty(identity.getEmailAddress())) {
			String value = identity.getName();
			if (StringUtils.isEmpty(value)) {
				if (showEmail) {
					value = identity.getEmailAddress();
				} else {
					value = getString("gb.missingUsername");
				}
			}
			Fragment partial = new Fragment(wicketId, "partialPersonIdent", this);
			LinkPanel link = new LinkPanel("personName", "list", value, SearchPage.class,
					WicketUtils.newSearchParameter(repositoryName, objectId, value, searchType));
			setPersonSearchTooltip(link, value, searchType);
			partial.add(link);
			return partial;
		} else {
			Fragment fullPerson = new Fragment(wicketId, "fullPersonIdent", this);
			LinkPanel nameLink = new LinkPanel("personName", "list", identity.getName(),
					SearchPage.class, WicketUtils.newSearchParameter(repositoryName, objectId,
							identity.getName(), searchType));
			setPersonSearchTooltip(nameLink, identity.getName(), searchType);
			fullPerson.add(nameLink);

			LinkPanel addressLink = new LinkPanel("personAddress", "list", "<"
					+ identity.getEmailAddress() + ">", SearchPage.class,
					WicketUtils.newSearchParameter(repositoryName, objectId,
							identity.getEmailAddress(), searchType));
			setPersonSearchTooltip(addressLink, identity.getEmailAddress(), searchType);
			fullPerson.add(addressLink);
			return fullPerson;
		}
	}

	protected void setPersonSearchTooltip(Component component, String value, SearchType searchType) {
		if (searchType.equals(SearchType.AUTHOR)) {
			WicketUtils.setHtmlTooltip(component, getString("gb.searchForAuthor") + " " + value);
		} else if (searchType.equals(SearchType.COMMITTER)) {
			WicketUtils.setHtmlTooltip(component, getString("gb.searchForCommitter") + " " + value);
		}
	}

	protected void setChangeTypeTooltip(Component container, ChangeType type) {
		switch (type) {
		case ADD:
			WicketUtils.setHtmlTooltip(container, getString("gb.addition"));
			break;
		case COPY:
		case RENAME:
			WicketUtils.setHtmlTooltip(container, getString("gb.rename"));
			break;
		case DELETE:
			WicketUtils.setHtmlTooltip(container, getString("gb.deletion"));
			break;
		case MODIFY:
			WicketUtils.setHtmlTooltip(container, getString("gb.modification"));
			break;
		}
	}

	@Override
	protected void onBeforeRender() {
		// dispose of repository object
		if (r != null) {
			r.close();
			r = null;
		}
		// setup page header and footer
		setupPage(repositoryName, "/ " + getPageName());
		super.onBeforeRender();
	}

	protected PageParameters newRepositoryParameter() {
		return WicketUtils.newRepositoryParameter(repositoryName);
	}

	protected PageParameters newCommitParameter() {
		return WicketUtils.newObjectParameter(repositoryName, objectId);
	}

	protected PageParameters newCommitParameter(String commitId) {
		return WicketUtils.newObjectParameter(repositoryName, commitId);
	}

	private static class PageRegistration implements Serializable {
		private static final long serialVersionUID = 1L;

		final String translationKey;
		final Class<? extends BasePage> pageClass;
		final boolean repositoryLink;

		PageRegistration(String translationKey, Class<? extends BasePage> pageClass) {
			this(translationKey, pageClass, true);
		}
		
		PageRegistration(String translationKey, Class<? extends BasePage> pageClass, boolean repositoryLink) {
			this.translationKey = translationKey;
			this.pageClass = pageClass;
			this.repositoryLink = repositoryLink;
		}
	}

	private static class SearchForm extends StatelessForm<Void> implements Serializable {
		private static final long serialVersionUID = 1L;

		private final String repositoryName;

		private final IModel<String> searchBoxModel = new Model<String>("");

		private final IModel<SearchType> searchTypeModel = new Model<SearchType>(SearchType.COMMIT);

		public SearchForm(String id, String repositoryName) {
			super(id);
			this.repositoryName = repositoryName;
			DropDownChoice<SearchType> searchType = new DropDownChoice<SearchType>("searchType",
					Arrays.asList(SearchType.values()));
			searchType.setModel(searchTypeModel);
			add(searchType.setVisible(GitBlit.getBoolean(Keys.web.showSearchTypeSelection, false)));
			TextField<String> searchBox = new TextField<String>("searchBox", searchBoxModel);
			add(searchBox);
		}

		void setTranslatedAttributes() {
			WicketUtils.setHtmlTooltip(get("searchType"), getString("gb.searchTypeTooltip"));
			WicketUtils.setHtmlTooltip(get("searchBox"), MessageFormat.format(getString("gb.searchTooltip"), repositoryName));
			WicketUtils.setInputPlaceholder(get("searchBox"), getString("gb.search"));
		}

		@Override
		public void onSubmit() {
			SearchType searchType = searchTypeModel.getObject();
			String searchString = searchBoxModel.getObject();
			if (searchString == null) {
				// FIXME IE intermittently has no searchString. Wicket bug?
				return;
			}
			for (SearchType type : SearchType.values()) {
				if (searchString.toLowerCase().startsWith(type.name().toLowerCase() + ":")) {
					searchType = type;
					searchString = searchString.substring(type.name().toLowerCase().length() + 1)
							.trim();
					break;
				}
			}
			setResponsePage(SearchPage.class,
					WicketUtils.newSearchParameter(repositoryName, null, searchString, searchType));
		}
	}
}