/*
 * Copyright 2014 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.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;

import org.apache.wicket.PageParameters;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.link.BookmarkablePageLink;
import org.apache.wicket.markup.repeater.Item;
import org.apache.wicket.markup.repeater.data.DataView;
import org.apache.wicket.markup.repeater.data.ListDataProvider;

import com.gitblit.Keys;
import com.gitblit.models.RepositoryModel;
import com.gitblit.models.TicketModel;
import com.gitblit.models.TicketModel.Status;
import com.gitblit.models.UserModel;
import com.gitblit.tickets.QueryBuilder;
import com.gitblit.tickets.QueryResult;
import com.gitblit.tickets.TicketIndexer.Lucene;
import com.gitblit.utils.ArrayUtils;
import com.gitblit.utils.StringUtils;
import com.gitblit.wicket.GitBlitWebSession;
import com.gitblit.wicket.TicketsUI;
import com.gitblit.wicket.TicketsUI.TicketSort;
import com.gitblit.wicket.WicketUtils;
import com.gitblit.wicket.panels.LinkPanel;
import com.gitblit.wicket.panels.TicketListPanel;
import com.gitblit.wicket.panels.TicketSearchForm;
import com.gitblit.wicket.panels.UserTitlePanel;

/**
 * My Tickets page
 *
 * @author Christian Buisson
 * @author James Moger
 */
public class MyTicketsPage extends RootPage {

    public MyTicketsPage() {
        this(null);
    }

    public MyTicketsPage(PageParameters params) {
        super(params);
        setupPage("", getString("gb.myTickets"));

        UserModel currentUser = GitBlitWebSession.get().getUser();
        if (currentUser == null || UserModel.ANONYMOUS.equals(currentUser)) {
            setRedirect(true);
            setResponsePage(getApplication().getHomePage());
            return;
        }

        final String username = currentUser.getName();

        final String[] statiiParam = (params == null) ? TicketsUI.openStatii : params.getStringArray(Lucene.status.name());
        final String assignedToParam = (params == null) ? "" : params.getString(Lucene.responsible.name(), null);
        final String milestoneParam = (params == null) ? "" : params.getString(Lucene.milestone.name(), null);
        final String queryParam = (params == null) ? null : params.getString("q", null);
        final String searchParam = (params == null) ? "" : params.getString("s", null);
        final String sortBy = (params == null) ? "" : Lucene.fromString(params.getString("sort", Lucene.created.name())).name();
        final String repositoryId = (params == null) ? "" : params.getString(Lucene.rid.name(), null);
        final boolean desc = (params == null) ? true : !"asc".equals(params.getString("direction", "desc"));


        // add the user title panel
        add(new UserTitlePanel("userTitlePanel", currentUser, getString("gb.myTickets")));

        // add search form
        add(new TicketSearchForm("ticketSearchForm", null, searchParam, getClass(), params));

        // standard queries
        add(new BookmarkablePageLink<Void>("changesQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.type.matches(TicketModel.Type.Proposal.name()),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));

        add(new BookmarkablePageLink<Void>("bugsQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.type.matches(TicketModel.Type.Bug.name()),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));

        add(new BookmarkablePageLink<Void>("enhancementsQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.type.matches(TicketModel.Type.Enhancement.name()),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));

        add(new BookmarkablePageLink<Void>("tasksQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.type.matches(TicketModel.Type.Task.name()),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));

        add(new BookmarkablePageLink<Void>("questionsQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.type.matches(TicketModel.Type.Question.name()),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));
        
        add(new BookmarkablePageLink<Void>("maintenanceQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.type.matches(TicketModel.Type.Maintenance.name()),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));

        add(new BookmarkablePageLink<Void>("resetQuery", MyTicketsPage.class,
                queryParameters(
                        null,
                        milestoneParam,
                        TicketsUI.openStatii,
                        null,
                        null,
                        true,
                        null,
                        1)));

        add(new Label("userDivider"));
        add(new BookmarkablePageLink<Void>("createdQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.createdby.matches(username),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));

        add(new BookmarkablePageLink<Void>("watchedQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.watchedby.matches(username),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));
        add(new BookmarkablePageLink<Void>("mentionsQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.mentions.matches(username),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));
        add(new BookmarkablePageLink<Void>("responsibleQuery", MyTicketsPage.class,
                queryParameters(
                        Lucene.responsible.matches(username),
                        milestoneParam,
                        statiiParam,
                        assignedToParam,
                        sortBy,
                        desc,
                        repositoryId,
                        1)));

        // states
        if (ArrayUtils.isEmpty(statiiParam)) {
            add(new Label("selectedStatii", getString("gb.all")));
        } else {
            add(new Label("selectedStatii", StringUtils.flattenStrings(Arrays.asList(statiiParam), ",")));
        }
        add(new BookmarkablePageLink<Void>("openTickets", MyTicketsPage.class, queryParameters(queryParam, milestoneParam, TicketsUI.openStatii, assignedToParam, sortBy, desc, repositoryId, 1)));
        add(new BookmarkablePageLink<Void>("closedTickets", MyTicketsPage.class, queryParameters(queryParam, milestoneParam, TicketsUI.closedStatii, assignedToParam, sortBy, desc, repositoryId, 1)));
        add(new BookmarkablePageLink<Void>("allTickets", MyTicketsPage.class, queryParameters(queryParam, milestoneParam, null, assignedToParam, sortBy, desc, repositoryId, 1)));

        // by status
        List<Status> statii = new ArrayList<Status>(Arrays.asList(Status.values()));
        statii.remove(Status.Closed);
        ListDataProvider<Status> resolutionsDp = new ListDataProvider<Status>(statii);
        DataView<Status> statiiLinks = new DataView<Status>("statii", resolutionsDp) {
            private static final long serialVersionUID = 1L;

            @Override
            public void populateItem(final Item<Status> item) {
                final Status status = item.getModelObject();
                PageParameters p = queryParameters(queryParam, milestoneParam, new String [] { status.name().toLowerCase() }, assignedToParam, sortBy, desc, repositoryId, 1);
                String css = TicketsUI.getStatusClass(status);
                item.add(new LinkPanel("statusLink", css, status.toString(), MyTicketsPage.class, p).setRenderBodyOnly(true));
            }
        };
        add(statiiLinks);

        // by sort
        List<TicketSort> sortChoices = new ArrayList<TicketSort>();
        sortChoices.add(new TicketSort(getString("gb.sortNewest"), Lucene.created.name(), true));
        sortChoices.add(new TicketSort(getString("gb.sortOldest"), Lucene.created.name(), false));
        sortChoices.add(new TicketSort(getString("gb.sortMostRecentlyUpdated"), Lucene.updated.name(), true));
        sortChoices.add(new TicketSort(getString("gb.sortLeastRecentlyUpdated"), Lucene.updated.name(), false));
        sortChoices.add(new TicketSort(getString("gb.sortMostComments"), Lucene.comments.name(), true));
        sortChoices.add(new TicketSort(getString("gb.sortLeastComments"), Lucene.comments.name(), false));
        sortChoices.add(new TicketSort(getString("gb.sortMostPatchsetRevisions"), Lucene.patchsets.name(), true));
        sortChoices.add(new TicketSort(getString("gb.sortLeastPatchsetRevisions"), Lucene.patchsets.name(), false));
        sortChoices.add(new TicketSort(getString("gb.sortMostVotes"), Lucene.votes.name(), true));
        sortChoices.add(new TicketSort(getString("gb.sortLeastVotes"), Lucene.votes.name(), false));
        sortChoices.add(new TicketSort(getString("gb.sortHighestPriority"), Lucene.priority.name(), true));
        sortChoices.add(new TicketSort(getString("gb.sortLowestPriority"), Lucene.priority.name(), false));
        sortChoices.add(new TicketSort(getString("gb.sortHighestSeverity"), Lucene.severity.name(), true));
        sortChoices.add(new TicketSort(getString("gb.sortLowestSeverity"), Lucene.severity.name(), false));

        TicketSort currentSort = sortChoices.get(0);
        for (TicketSort ts : sortChoices) {
            if (ts.sortBy.equals(sortBy) && desc == ts.desc) {
                currentSort = ts;
                break;
            }
        }
        add(new Label("currentSort", currentSort.name));

        ListDataProvider<TicketSort> sortChoicesDp = new ListDataProvider<TicketSort>(sortChoices);
        DataView<TicketSort> sortMenu = new DataView<TicketSort>("sort", sortChoicesDp) {
            private static final long serialVersionUID = 1L;

            @Override
            public void populateItem(final Item<TicketSort> item) {
                final TicketSort ts = item.getModelObject();
                PageParameters params = queryParameters(queryParam, milestoneParam, statiiParam, assignedToParam, ts.sortBy, ts.desc, repositoryId, 1);
                item.add(new LinkPanel("sortLink", null, ts.name, MyTicketsPage.class, params).setRenderBodyOnly(true));
            }
        };
        add(sortMenu);

        // by repository
        final List<QueryResult> tickets =
            query(initializeQueryBuilder(null, username), 1, Integer.MAX_VALUE, sortBy, desc);
        final List<RepositoryModel> repositoryChoices = correspondingRepositories(tickets);
        Collections.sort(repositoryChoices);

        final RepositoryModel noneChoice = new RepositoryModel();
        noneChoice.name = getString("gb.all");
        repositoryChoices.add(0, noneChoice);

        RepositoryModel currentRepository = repositoryChoices.get(0);
        for (RepositoryModel r : repositoryChoices) {
            if (r.getRID().equals(repositoryId)) {
                currentRepository = r;
                break;
            }
        }
        add(new Label("currentRepository", currentRepository.toString()));

        ListDataProvider<RepositoryModel> repositoryChoicesDp = new ListDataProvider<RepositoryModel>(repositoryChoices);
        DataView<RepositoryModel> repositoryMenu = new DataView<RepositoryModel>("repository", repositoryChoicesDp) {
            private static final long serialVersionUID = 1L;

            @Override
            public void populateItem(final Item<RepositoryModel> item) {
                final RepositoryModel r = item.getModelObject();
                String rid = r == noneChoice ? null : r.getRID();
                PageParameters params = queryParameters(queryParam, milestoneParam, statiiParam, assignedToParam, sortBy, desc, rid, 1);
                item.add(new LinkPanel("repositoryLink", null, r.toString(), MyTicketsPage.class, params).setRenderBodyOnly(true));
            }
        };
        add(repositoryMenu);

        // Update query with filter criteria
        final QueryBuilder qb = initializeQueryBuilder(queryParam, username);

        if (!qb.containsField(Lucene.status.name()) && !ArrayUtils.isEmpty(statiiParam)) {
            // specify the states
            boolean not = false;
            QueryBuilder q = new QueryBuilder();
            for (String state : statiiParam) {
                if (state.charAt(0) == '!') {
                    not = true;
                    q.and(Lucene.status.doesNotMatch(state.substring(1)));
                } else {
                    q.or(Lucene.status.matches(state));
                }
            }

            if (not) {
                qb.and(q.toString());
            } else {
                qb.and(q.toSubquery().toString());
            }
        }

        if (noneChoice != currentRepository && !qb.containsField(Lucene.rid.name())) {
            QueryBuilder q1 = new QueryBuilder();
            q1.and(Lucene.rid.matches(repositoryId));
            qb.and(q1.toSubquery().toString());
        }

        // paging links
        int page = (params != null) ? Math.max(1, WicketUtils.getPage(params)) : 1;
        int pageSize = app().settings().getInteger(Keys.tickets.perPage, 25);

        final List<QueryResult> results = 
            StringUtils.isEmpty(searchParam) ? query(qb, page, pageSize, sortBy, desc) : search(searchParam, page, pageSize);

        int totalResults = results.size() == 0 ? 0 : results.get(0).totalResults;
        buildPager(queryParam, milestoneParam, statiiParam, assignedToParam, sortBy, desc, repositoryId, page, pageSize, results.size(), totalResults);

        final boolean showSwatch = app().settings().getBoolean(Keys.web.repositoryListSwatches, true);
        add(new TicketListPanel("ticketList", results, showSwatch, true));
    }

    protected PageParameters queryParameters(
            String query,
            String milestone,
            String[] states,
            String assignedTo,
            String sort,
            boolean descending,
            String repositoryId,
            int page) {

        PageParameters params = WicketUtils.newRepositoryParameter("");
        if (!StringUtils.isEmpty(query)) {
            params.add("q", query);
        }
        if (!StringUtils.isEmpty(milestone)) {
            params.add(Lucene.milestone.name(), milestone);
        }
        if (!ArrayUtils.isEmpty(states)) {
            for (String state : states) {
                params.add(Lucene.status.name(), state);
            }
        }
        if (!StringUtils.isEmpty(assignedTo)) {
            params.add(Lucene.responsible.name(), assignedTo);
        }
        if (!StringUtils.isEmpty(sort)) {
            params.add("sort", sort);
        }
        if (!descending) {
            params.add("direction", "asc");
        }
        if (!StringUtils.isEmpty(repositoryId)) {
            params.add(Lucene.rid.name(), repositoryId);
        }
        if (page > 1) {
            params.add("pg", "" + page);
        }
        return params;
    }

    protected void buildPager(
            final String query,
            final String milestone,
            final String [] states,
            final String assignedTo,
            final String sort,
            final boolean desc,
            final String repositoryId,
            final int page,
            int pageSize,
            int count,
            int total) {

        boolean showNav = total > (2 * pageSize);
        boolean allowPrev = page > 1;
        boolean allowNext = (pageSize * (page - 1) + count) < total;
        add(new BookmarkablePageLink<Void>("prevLink", MyTicketsPage.class, queryParameters(query, milestone, states, assignedTo, sort, desc, repositoryId, page - 1)).setEnabled(allowPrev).setVisible(showNav));
        add(new BookmarkablePageLink<Void>("nextLink", MyTicketsPage.class, queryParameters(query, milestone, states, assignedTo, sort, desc, repositoryId, page + 1)).setEnabled(allowNext).setVisible(showNav));

        if (total <= pageSize) {
            add(new Label("pageLink").setVisible(false));
            return;
        }

        // determine page numbers to display
        int pages = count == 0 ? 0 : ((total / pageSize) + (total % pageSize == 0 ? 0 : 1));
        // preferred number of pagelinks
        int segments = 5;
        if (pages < segments) {
            // not enough data for preferred number of page links
            segments = pages;
        }
        int minpage = Math.min(Math.max(1, page - 2), pages - (segments - 1));
        int maxpage = Math.min(pages, minpage + (segments - 1));
        List<Integer> sequence = new ArrayList<Integer>();
        for (int i = minpage; i <= maxpage; i++) {
            sequence.add(i);
        }

        ListDataProvider<Integer> pagesDp = new ListDataProvider<Integer>(sequence);
        DataView<Integer> pagesView = new DataView<Integer>("pageLink", pagesDp) {
            private static final long serialVersionUID = 1L;

            @Override
            public void populateItem(final Item<Integer> item) {
                final Integer i = item.getModelObject();
                LinkPanel link = new LinkPanel("page", null, "" + i, MyTicketsPage.class, queryParameters(query, milestone, states, assignedTo, sort, desc, repositoryId, i));
                link.setRenderBodyOnly(true);
                if (i == page) {
                    WicketUtils.setCssClass(item, "active");
                }
                item.add(link);
            }
        };
        add(pagesView);
    }

    private QueryBuilder initializeQueryBuilder(String queryparam, String username) {
        final QueryBuilder qb = new QueryBuilder(queryparam);

        // focused "my tickets"
        if (qb.containsField(Lucene.createdby.name())
                || qb.containsField(Lucene.responsible.name())
                || qb.containsField(Lucene.watchedby.name())
                || qb.containsField(Lucene.mentions.name())) {

            return qb;
        }

        // general "my tickets"
        return qb.andSubquery()
                 .or(Lucene.createdby.matches(username))
                 .or(Lucene.responsible.matches(username))
                 .or(Lucene.watchedby.matches(username))
                 .or(Lucene.mentions.matches(username))
                 .endSubquery();
    }

    private List<QueryResult> query(QueryBuilder qb, int page, int pageSize, String sortBy, boolean descending) {
        return app().tickets().queryFor(qb.build(), page, pageSize, sortBy, descending);
    }

    private List<QueryResult> search(String searchParam, int page, int pageSize) {
        return app().tickets().searchFor(null, searchParam, page, pageSize);
    }

    private List<RepositoryModel> correspondingRepositories(Collection<QueryResult> tickets) { 
        final HashMap<String, RepositoryModel> result = new HashMap<>();
        for (QueryResult ticket : tickets) {
            RepositoryModel repository = app().repositories().getRepositoryModel(ticket.repository);
            if (!result.containsKey(repository.getRID())) {
                result.put(repository.getRID(), repository);
            }
        }

        return new ArrayList<>(result.values());
    }
}