// 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.account;

import com.google.gerrit.client.Gerrit;
import com.google.gerrit.client.rpc.GerritCallback;
import com.google.gerrit.client.rpc.ScreenLoadCallback;
import com.google.gerrit.client.ui.HintTextBox;
import com.google.gerrit.client.ui.ProjectNameSuggestOracle;
import com.google.gerrit.client.ui.ProjectsTable;
import com.google.gerrit.common.PageLinks;
import com.google.gerrit.common.data.AccountProjectWatchInfo;
import com.google.gerrit.reviewdb.Project;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.HTMLTable.CellFormatter;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.SuggestBox;
import com.google.gwt.user.client.ui.SuggestBox.DefaultSuggestionDisplay;
import com.google.gwt.user.client.ui.SuggestOracle.Suggestion;
import com.google.gwtexpui.globalkey.client.GlobalKey;
import com.google.gwtexpui.globalkey.client.HidePopupPanelCommand;
import com.google.gwtexpui.user.client.PluginSafeDialogBox;

import java.util.List;

public class MyWatchedProjectsScreen extends SettingsScreen implements
    ResizeHandler {
  private Button addNew;
  private HintTextBox nameBox;
  private SuggestBox nameTxt;
  private HintTextBox filterTxt;
  private MyWatchesTable watchesTab;
  private Button browse;
  private PluginSafeDialogBox popup;
  private Button close;
  private ProjectsTable projectsTab;
  private Button delSel;

  private PopupPanel.PositionCallback popupPosition;
  private HandlerRegistration regWindowResize;

  private int preferredPopupWidth = -1;

  private boolean submitOnSelection;
  private boolean firstPopupLoad = true;
  private boolean popingUp;

  private ScrollPanel sp;

  @Override
  protected void onInitUI() {
    super.onInitUI();
    createWidgets();


    /* top table */

    final Grid grid = new Grid(2, 2);
    grid.setStyleName(Gerrit.RESOURCES.css().infoBlock());
    grid.setText(0, 0, Util.C.watchedProjectName());
    grid.setWidget(0, 1, nameTxt);

    grid.setText(1, 0, Util.C.watchedProjectFilter());
    grid.setWidget(1, 1, filterTxt);

    final CellFormatter fmt = grid.getCellFormatter();
    fmt.addStyleName(0, 0, Gerrit.RESOURCES.css().topmost());
    fmt.addStyleName(0, 1, Gerrit.RESOURCES.css().topmost());
    fmt.addStyleName(0, 0, Gerrit.RESOURCES.css().header());
    fmt.addStyleName(1, 0, Gerrit.RESOURCES.css().header());
    fmt.addStyleName(1, 0, Gerrit.RESOURCES.css().bottomheader());

    final FlowPanel fp = new FlowPanel();
    fp.setStyleName(Gerrit.RESOURCES.css().addWatchPanel());
    fp.add(grid);
    fp.add(addNew);
    fp.add(browse);
    add(fp);


    /* bottom table */

    add(watchesTab);
    add(delSel);


    /* popup */

    final FlowPanel pfp = new FlowPanel();
    sp = new ScrollPanel(projectsTab);
    pfp.add(sp);
    pfp.add(close);
    popup.setWidget(pfp);

    popupPosition = new PopupPanel.PositionCallback() {
      public void setPosition(int offsetWidth, int offsetHeight) {
        if (preferredPopupWidth == -1) {
          preferredPopupWidth = offsetWidth;
        }

        int top = grid.getAbsoluteTop() - 50; // under page header

        // Try to place it to the right of everything else, but not
        // right justified
        int left = 5 + Math.max(
                         grid.getAbsoluteLeft() + grid.getOffsetWidth(),
                   watchesTab.getAbsoluteLeft() + watchesTab.getOffsetWidth() );

        if (top + offsetHeight > Window.getClientHeight()) {
          top = Window.getClientHeight() - offsetHeight;
        }
        if (left + offsetWidth > Window.getClientWidth()) {
          left = Window.getClientWidth() - offsetWidth;
        }

        if (top < 0) {
          sp.setHeight((sp.getOffsetHeight() + top) + "px");
          top = 0;
        }
        if (left < 0) {
          sp.setWidth((sp.getOffsetWidth() + left) + "px");
          left = 0;
        }

        popup.setPopupPosition(left, top);
      }
    };
  }

  @Override
  public void onResize(final ResizeEvent event) {
    sp.setSize("100%","100%");

    // For some reason keeping track of preferredWidth keeps the width better,
    // but using 100% for height works better.
    popup.setHeight("100%");
    popupPosition.setPosition(preferredPopupWidth, popup.getOffsetHeight());
  }

  protected void createWidgets() {
    nameBox = new HintTextBox();
    nameTxt = new SuggestBox(new ProjectNameSuggestOracle(), nameBox);
    nameBox.setVisibleLength(50);
    nameBox.setHintText(Util.C.defaultProjectName());
    nameBox.addKeyPressHandler(new KeyPressHandler() {
      @Override
      public void onKeyPress(KeyPressEvent event) {
        submitOnSelection = false;

        if (event.getNativeEvent().getKeyCode() == KeyCodes.KEY_ENTER) {
          if (((DefaultSuggestionDisplay) nameTxt.getSuggestionDisplay())
              .isSuggestionListShowing()) {
            submitOnSelection = true;
          } else {
            doAddNew();
          }
        }
      }
    });
    nameTxt.addSelectionHandler(new SelectionHandler<Suggestion>() {
      @Override
      public void onSelection(SelectionEvent<Suggestion> event) {
        if (submitOnSelection) {
          submitOnSelection = false;
          doAddNew();
        }
      }
    });

    filterTxt = new HintTextBox();
    filterTxt.setVisibleLength(50);
    filterTxt.setHintText(Util.C.defaultFilter());
    filterTxt.addKeyPressHandler(new KeyPressHandler() {
      @Override
      public void onKeyPress(KeyPressEvent event) {
        if (event.getNativeEvent().getKeyCode() == KeyCodes.KEY_ENTER) {
          doAddNew();
        }
      }
    });

    addNew = new Button(Util.C.buttonWatchProject());
    addNew.addClickHandler(new ClickHandler() {
      @Override
      public void onClick(final ClickEvent event) {
        doAddNew();
      }
    });

    projectsTab = new ProjectsTable() {
      {
        keysNavigation.add(new OpenKeyCommand(0, 'o', Util.C.projectListOpen()));
        keysNavigation.add(new OpenKeyCommand(0, KeyCodes.KEY_ENTER,
                                                      Util.C.projectListOpen()));
      }

      @Override
      protected void movePointerTo(final int row, final boolean scroll) {
        super.movePointerTo(row, scroll);

        // prevent user input from being overwritten by simply poping up
        if (! popingUp || "".equals(nameBox.getText()) ) {
          nameBox.setText(getRowItem(row).getName());
        }
      }

      @Override
      protected void onOpenRow(final int row) {
        super.onOpenRow(row);
        nameBox.setText(getRowItem(row).getName());
        doAddNew();
      }
    };
    projectsTab.setSavePointerId(PageLinks.SETTINGS_PROJECTS);

    close = new Button(Util.C.projectsClose());
    close.addClickHandler(new ClickHandler() {
      @Override
      public void onClick(final ClickEvent event) {
        closePopup();
      }
    });

    popup = new PluginSafeDialogBox();
    popup.setModal(false);
    popup.setText(Util.C.projects());

    browse = new Button(Util.C.buttonBrowseProjects());
    browse.addClickHandler(new ClickHandler() {
      @Override
      public void onClick(final ClickEvent event) {
        displayPopup();
      }
    });

    watchesTab = new MyWatchesTable();

    delSel = new Button(Util.C.buttonDeleteSshKey());
    delSel.addClickHandler(new ClickHandler() {
      @Override
      public void onClick(final ClickEvent event) {
        watchesTab.deleteChecked();
      }
    });
  }

  @Override
  protected void onLoad() {
    super.onLoad();
    populateWatches();
  }

  @Override
  protected void onUnload() {
    super.onUnload();
    closePopup();
  }

  protected void displayPopup() {
    popingUp = true;
    if (firstPopupLoad) { // For sizing/positioning, delay display until loaded
      populateProjects();
    } else {
      popup.setPopupPositionAndShow(popupPosition);

      GlobalKey.dialog(popup);
      GlobalKey.addApplication(popup, new HidePopupPanelCommand(0,
          KeyCodes.KEY_ESCAPE, popup));
      projectsTab.setRegisterKeys(true);

      projectsTab.finishDisplay();

      if (regWindowResize == null) {
        regWindowResize = Window.addResizeHandler(this);
      }

      popingUp = false;
    }
  }

  protected void closePopup() {
    popup.hide();
    if (regWindowResize != null) {
      regWindowResize.removeHandler();
      regWindowResize = null;
    }
  }

  protected void doAddNew() {
    final String projectName = nameTxt.getText();
    if ("".equals(projectName)) {
      return;
    }

    String filter = filterTxt.getText();
    if (filter == null || filter.isEmpty()
        || filter.equals(Util.C.defaultFilter())) {
      filter = null;
    }

    addNew.setEnabled(false);
    nameBox.setEnabled(false);
    filterTxt.setEnabled(false);

    Util.ACCOUNT_SVC.addProjectWatch(projectName, filter,
        new GerritCallback<AccountProjectWatchInfo>() {
          public void onSuccess(final AccountProjectWatchInfo result) {
            addNew.setEnabled(true);
            nameBox.setEnabled(true);
            filterTxt.setEnabled(true);

            nameTxt.setText("");
            watchesTab.insertWatch(result);
          }

          @Override
          public void onFailure(final Throwable caught) {
            addNew.setEnabled(true);
            nameBox.setEnabled(true);
            filterTxt.setEnabled(true);

            super.onFailure(caught);
          }
        });
  }

  protected void populateWatches() {
    Util.ACCOUNT_SVC.myProjectWatch(
        new ScreenLoadCallback<List<AccountProjectWatchInfo>>(this) {
      @Override
      public void preDisplay(final List<AccountProjectWatchInfo> result) {
        watchesTab.display(result);
      }
    });
  }

  protected void populateProjects() {
    Util.PROJECT_SVC.visibleProjects(
        new GerritCallback<List<Project>>() {
      @Override
      public void onSuccess(final List<Project> result) {
        projectsTab.display(result);
        if (firstPopupLoad) { // Display was delayed until table was loaded
          firstPopupLoad = false;
          displayPopup();
        }
      }
    });
  }
}