// Copyright (C) 2008 The Android Open Source Project
//
// 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.google.gerrit.client.admin;

import static com.google.gerrit.common.PageLinks.ADMIN_PROJECTS;

import com.google.gerrit.client.Dispatcher;
import com.google.gerrit.client.Gerrit;
import com.google.gerrit.client.info.WebLinkInfo;
import com.google.gerrit.client.projects.ProjectInfo;
import com.google.gerrit.client.projects.ProjectMap;
import com.google.gerrit.client.rpc.GerritCallback;
import com.google.gerrit.client.rpc.Natives;
import com.google.gerrit.client.ui.HighlightingInlineHyperlink;
import com.google.gerrit.client.ui.Hyperlink;
import com.google.gerrit.client.ui.PagingHyperlink;
import com.google.gerrit.client.ui.ProjectSearchLink;
import com.google.gerrit.client.ui.ProjectsTable;
import com.google.gerrit.common.PageLinks;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwtexpui.globalkey.client.NpTextBox;
import java.util.List;

public class ProjectListScreen extends PaginatedProjectScreen {
  private Hyperlink prev;
  private Hyperlink next;
  private ProjectsTable projects;
  private NpTextBox filterTxt;

  private Query query;

  public ProjectListScreen() {
    super(null);
  }

  public ProjectListScreen(String params) {
    this();
    parseToken(params);
  }

  @Override
  protected void onLoad() {
    super.onLoad();
    query = new Query(match).start(start).run();
  }

  @Override
  public String getScreenToken() {
    return ADMIN_PROJECTS;
  }

  @Override
  protected void onInitUI() {
    super.onInitUI();
    setPageTitle(AdminConstants.I.projectListTitle());
    initPageHeader();

    prev = PagingHyperlink.createPrev();
    prev.setVisible(false);

    next = PagingHyperlink.createNext();
    next.setVisible(false);

    projects =
        new ProjectsTable() {
          @Override
          protected void initColumnHeaders() {
            super.initColumnHeaders();
            table.setText(0, ProjectsTable.C_REPO_BROWSER, AdminConstants.I.projectRepoBrowser());
            table
                .getFlexCellFormatter()
                .addStyleName(0, ProjectsTable.C_REPO_BROWSER, Gerrit.RESOURCES.css().dataHeader());
          }

          @Override
          protected void onOpenRow(int row) {
            History.newItem(link(getRowItem(row)));
          }

          private String link(ProjectInfo item) {
            return Dispatcher.toProject(item.name_key());
          }

          @Override
          protected void insert(int row, ProjectInfo k) {
            super.insert(row, k);
            table
                .getFlexCellFormatter()
                .addStyleName(row, ProjectsTable.C_REPO_BROWSER, Gerrit.RESOURCES.css().dataCell());
          }

          @Override
          protected void populate(int row, ProjectInfo k) {
            populateState(row, k);
            FlowPanel fp = new FlowPanel();
            fp.add(new ProjectSearchLink(k.name_key()));
            fp.add(new HighlightingInlineHyperlink(k.name(), link(k), match));
            table.setWidget(row, ProjectsTable.C_NAME, fp);
            table.setText(row, ProjectsTable.C_DESCRIPTION, k.description());
            addWebLinks(row, k);

            setRowItem(row, k);
          }

          private void addWebLinks(int row, ProjectInfo k) {
            List<WebLinkInfo> webLinks = Natives.asList(k.webLinks());
            if (webLinks != null && !webLinks.isEmpty()) {
              FlowPanel p = new FlowPanel();
              table.setWidget(row, ProjectsTable.C_REPO_BROWSER, p);
              for (WebLinkInfo weblink : webLinks) {
                p.add(weblink.toAnchor());
              }
            }
          }
        };
    projects.setSavePointerId(PageLinks.ADMIN_PROJECTS);

    add(projects);
    final HorizontalPanel buttons = new HorizontalPanel();
    buttons.setStyleName(Gerrit.RESOURCES.css().changeTablePrevNextLinks());
    buttons.add(prev);
    buttons.add(next);
    add(buttons);
  }

  private void initPageHeader() {
    final HorizontalPanel hp = new HorizontalPanel();
    hp.setStyleName(Gerrit.RESOURCES.css().projectFilterPanel());
    final Label filterLabel = new Label(AdminConstants.I.projectFilter());
    filterLabel.setStyleName(Gerrit.RESOURCES.css().projectFilterLabel());
    hp.add(filterLabel);
    filterTxt = new NpTextBox();
    filterTxt.setValue(match);
    filterTxt.addKeyUpHandler(
        new KeyUpHandler() {
          @Override
          public void onKeyUp(KeyUpEvent event) {
            Query q =
                new Query(filterTxt.getValue())
                    .open(event.getNativeKeyCode() == KeyCodes.KEY_ENTER);
            if (match.equals(q.qMatch)) {
              q.start(start);
            }
            if (q.open || !match.equals(q.qMatch)) {
              if (query == null) {
                q.run();
              }
              query = q;
            }
          }
        });
    hp.add(filterTxt);
    add(hp);
  }

  @Override
  public void onShowView() {
    super.onShowView();
    if (match != null) {
      filterTxt.setCursorPos(match.length());
    }
    filterTxt.setFocus(true);
  }

  @Override
  public void registerKeys() {
    super.registerKeys();
    projects.setRegisterKeys(true);
  }

  private class Query {
    private final String qMatch;
    private int qStart;
    private boolean open;

    Query(String match) {
      this.qMatch = match;
    }

    Query start(int start) {
      this.qStart = start;
      return this;
    }

    Query open(boolean open) {
      this.open = open;
      return this;
    }

    Query run() {
      int limit = open ? 1 : pageSize + 1;
      ProjectMap.match(
          qMatch,
          limit,
          qStart,
          new GerritCallback<ProjectMap>() {
            @Override
            public void onSuccess(ProjectMap result) {
              if (!isAttached()) {
                // View has been disposed.
              } else if (query == Query.this) {
                query = null;
                showMap(result);
              } else {
                query.run();
              }
            }
          });
      return this;
    }

    private void showMap(ProjectMap result) {
      if (open && !result.isEmpty()) {
        Gerrit.display(PageLinks.toProject(result.values().get(0).name_key()));
        return;
      }

      setToken(getTokenForScreen(qMatch, qStart));
      ProjectListScreen.this.match = qMatch;
      ProjectListScreen.this.start = qStart;

      if (result.size() <= pageSize) {
        projects.display(result);
        next.setVisible(false);
      } else {
        projects.displaySubset(result, 0, result.size() - 1);
        setupNavigationLink(next, qMatch, qStart + pageSize);
      }

      if (qStart > 0) {
        setupNavigationLink(prev, qMatch, qStart - pageSize);
      } else {
        prev.setVisible(false);
      }

      if (!isCurrentView()) {
        display();
      }
    }
  }
}