// 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 com.google.gerrit.client.Gerrit;
import com.google.gerrit.client.access.AccessMap;
import com.google.gerrit.client.access.ProjectAccessInfo;
import com.google.gerrit.client.actions.ActionButton;
import com.google.gerrit.client.actions.ActionInfo;
import com.google.gerrit.client.change.Resources;
import com.google.gerrit.client.download.DownloadPanel;
import com.google.gerrit.client.projects.ConfigInfo;
import com.google.gerrit.client.projects.ConfigInfo.InheritedBooleanInfo;
import com.google.gerrit.client.projects.ProjectApi;
import com.google.gerrit.client.rpc.CallbackGroup;
import com.google.gerrit.client.rpc.GerritCallback;
import com.google.gerrit.client.rpc.NativeMap;
import com.google.gerrit.client.rpc.ScreenLoadCallback;
import com.google.gerrit.client.ui.OnEditEnabler;
import com.google.gerrit.client.ui.SmallHeading;
import com.google.gerrit.reviewdb.client.AccountGeneralPreferences.DownloadCommand;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.Project.InheritableBoolean;
import com.google.gerrit.reviewdb.client.Project.SubmitType;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlexTable;
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.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwtexpui.globalkey.client.NpTextArea;
import com.google.gwtexpui.globalkey.client.NpTextBox;

public class ProjectInfoScreen extends ProjectScreen {
  private boolean isOwner;

  private LabeledWidgetsGrid grid;
  private LabeledWidgetsGrid actionsGrid;

  // Section: Project Options
  private ListBox requireChangeID;
  private ListBox submitType;
  private ListBox state;
  private ListBox contentMerge;
  private NpTextBox maxObjectSizeLimit;
  private Label effectiveMaxObjectSizeLimit;

  // Section: Contributor Agreements
  private ListBox contributorAgreements;
  private ListBox signedOffBy;

  private NpTextArea descTxt;
  private Button saveProject;

  private OnEditEnabler saveEnabler;

  public ProjectInfoScreen(final Project.NameKey toShow) {
    super(toShow);
  }

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

    Resources.I.style().ensureInjected();
    saveProject = new Button(Util.C.buttonSaveChanges());
    saveProject.addClickHandler(new ClickHandler() {
      @Override
      public void onClick(ClickEvent event) {
        doSave();
      }
    });

    add(new ProjectDownloadPanel(getProjectKey().get(), true));

    initDescription();
    grid = new LabeledWidgetsGrid();
    actionsGrid = new LabeledWidgetsGrid();
    initProjectOptions();
    initAgreements();
    add(grid);
    add(saveProject);
    add(actionsGrid);
  }

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

    Project.NameKey project = getProjectKey();
    CallbackGroup cbg = new CallbackGroup();
    AccessMap.get(project,
        cbg.add(new GerritCallback<ProjectAccessInfo>() {
          @Override
          public void onSuccess(ProjectAccessInfo result) {
            isOwner = result.isOwner();
            enableForm();
            saveProject.setVisible(isOwner);
          }
        }));
    ProjectApi.getConfig(project,
        cbg.addFinal(new ScreenLoadCallback<ConfigInfo>(this) {
          @Override
          public void preDisplay(ConfigInfo result) {
            display(result);
          }
        }));

    savedPanel = INFO;
  }

  private void enableForm() {
    enableForm(isOwner);
  }

  private void enableForm(boolean isOwner) {
    submitType.setEnabled(isOwner);
    state.setEnabled(isOwner);
    contentMerge.setEnabled(isOwner);
    descTxt.setEnabled(isOwner);
    contributorAgreements.setEnabled(isOwner);
    signedOffBy.setEnabled(isOwner);
    requireChangeID.setEnabled(isOwner);
    maxObjectSizeLimit.setEnabled(isOwner);
  }

  private void initDescription() {
    final VerticalPanel vp = new VerticalPanel();
    vp.add(new SmallHeading(Util.C.headingDescription()));

    descTxt = new NpTextArea();
    descTxt.setVisibleLines(6);
    descTxt.setCharacterWidth(60);
    vp.add(descTxt);

    add(vp);
    saveEnabler = new OnEditEnabler(saveProject);
    saveEnabler.listenTo(descTxt);
  }

  private void initProjectOptions() {
    grid.addHeader(new SmallHeading(Util.C.headingProjectOptions()));

    submitType = new ListBox();
    for (final Project.SubmitType type : Project.SubmitType.values()) {
      submitType.addItem(Util.toLongString(type), type.name());
    }
    submitType.addChangeHandler(new ChangeHandler() {
      @Override
      public void onChange(ChangeEvent event) {
        setEnabledForUseContentMerge();
      }
    });
    saveEnabler.listenTo(submitType);
    grid.add(Util.C.headingProjectSubmitType(), submitType);

    state = new ListBox();
    for (final Project.State stateValue : Project.State.values()) {
      state.addItem(Util.toLongString(stateValue), stateValue.name());
    }
    saveEnabler.listenTo(state);
    grid.add(Util.C.headingProjectState(), state);

    contentMerge = newInheritedBooleanBox();
    saveEnabler.listenTo(contentMerge);
    grid.add(Util.C.useContentMerge(), contentMerge);

    requireChangeID = newInheritedBooleanBox();
    saveEnabler.listenTo(requireChangeID);
    grid.addHtml(Util.C.requireChangeID(), requireChangeID);

    maxObjectSizeLimit = new NpTextBox();
    saveEnabler.listenTo(maxObjectSizeLimit);
    effectiveMaxObjectSizeLimit = new Label();
    HorizontalPanel p = new HorizontalPanel();
    p.setStyleName(Gerrit.RESOURCES.css().maxObjectSizeLimitPanel());
    p.add(maxObjectSizeLimit);
    p.add(effectiveMaxObjectSizeLimit);
    grid.addHtml(Util.C.headingMaxObjectSizeLimit(), p);
  }

  private static ListBox newInheritedBooleanBox() {
    ListBox box = new ListBox();
    for (InheritableBoolean b : InheritableBoolean.values()) {
      box.addItem(b.name(), b.name());
    }
    return box;
  }

  /**
   * Enables the {@link #contentMerge} checkbox if the selected submit type
   * allows the usage of content merge.
   * If the submit type (currently only 'Fast Forward Only') does not allow
   * content merge the useContentMerge checkbox gets disabled.
   */
  private void setEnabledForUseContentMerge() {
    if (SubmitType.FAST_FORWARD_ONLY.equals(Project.SubmitType
        .valueOf(submitType.getValue(submitType.getSelectedIndex())))) {
      contentMerge.setEnabled(false);
      InheritedBooleanInfo b = InheritedBooleanInfo.create();
      b.setConfiguredValue(InheritableBoolean.FALSE);
      setBool(contentMerge, b);
    } else {
      contentMerge.setEnabled(submitType.isEnabled());
    }
  }

  private void initAgreements() {
    grid.addHeader(new SmallHeading(Util.C.headingAgreements()));

    contributorAgreements = newInheritedBooleanBox();
    if (Gerrit.getConfig().isUseContributorAgreements()) {
      saveEnabler.listenTo(contributorAgreements);
      grid.add(Util.C.useContributorAgreements(), contributorAgreements);
    }

    signedOffBy = newInheritedBooleanBox();
    saveEnabler.listenTo(signedOffBy);
    grid.addHtml(Util.C.useSignedOffBy(), signedOffBy);
  }

  private void setSubmitType(final Project.SubmitType newSubmitType) {
    int index = -1;
    if (submitType != null) {
      for (int i = 0; i < submitType.getItemCount(); i++) {
        if (newSubmitType.name().equals(submitType.getValue(i))) {
          index = i;
          break;
        }
      }
      submitType.setSelectedIndex(index);
      setEnabledForUseContentMerge();
    }
  }

  private void setState(final Project.State newState) {
    if (state != null) {
      for (int i = 0; i < state.getItemCount(); i++) {
        if (newState.name().equals(state.getValue(i))) {
          state.setSelectedIndex(i);
          break;
        }
      }
    }
  }

  private void setBool(ListBox box, InheritedBooleanInfo inheritedBoolean) {
    int inheritedIndex = -1;
    for (int i = 0; i < box.getItemCount(); i++) {
      if (box.getValue(i).startsWith(InheritableBoolean.INHERIT.name())) {
        inheritedIndex = i;
      }
      if (box.getValue(i).startsWith(inheritedBoolean.configured_value().name())) {
        box.setSelectedIndex(i);
      }
    }
    if (inheritedIndex >= 0) {
      if (getProjectKey().equals(Gerrit.getConfig().getWildProject())) {
        if (box.getSelectedIndex() == inheritedIndex) {
          for (int i = 0; i < box.getItemCount(); i++) {
            if (box.getValue(i).equals(InheritableBoolean.FALSE.name())) {
              box.setSelectedIndex(i);
              break;
            }
          }
        }
        box.removeItem(inheritedIndex);
      } else {
        box.setItemText(inheritedIndex, InheritableBoolean.INHERIT.name() + " ("
            + inheritedBoolean.inherited_value() + ")");
      }
    }
  }

  private static InheritableBoolean getBool(ListBox box) {
    int i = box.getSelectedIndex();
    if (i >= 0) {
      final String selectedValue = box.getValue(i);
      if (selectedValue.startsWith(InheritableBoolean.INHERIT.name())) {
        return InheritableBoolean.INHERIT;
      }
      return InheritableBoolean.valueOf(selectedValue);
    }
    return InheritableBoolean.INHERIT;
  }

  void display(ConfigInfo result) {
    descTxt.setText(result.description());
    setBool(contributorAgreements, result.use_contributor_agreements());
    setBool(signedOffBy, result.use_signed_off_by());
    setBool(contentMerge, result.use_content_merge());
    setBool(requireChangeID, result.require_change_id());
    setSubmitType(result.submit_type());
    setState(result.state());
    maxObjectSizeLimit.setText(result.max_object_size_limit().configured_value());
    if (result.max_object_size_limit().inherited_value() != null) {
      effectiveMaxObjectSizeLimit.setVisible(true);
      effectiveMaxObjectSizeLimit.setText(
          Util.M.effectiveMaxObjectSizeLimit(result.max_object_size_limit().value()));
      effectiveMaxObjectSizeLimit.setTitle(
          Util.M.globalMaxObjectSizeLimit(result.max_object_size_limit().inherited_value()));
    } else {
      effectiveMaxObjectSizeLimit.setVisible(false);
    }

    saveProject.setEnabled(false);
    initProjectActions(result);
  }

  private void initProjectActions(ConfigInfo info) {
    actionsGrid.clear(true);
    actionsGrid.removeAllRows();

    NativeMap<ActionInfo> actions = info.actions();
    if (actions == null || actions.isEmpty()) {
      return;
    }
    actions.copyKeysIntoChildren("id");
    actionsGrid.addHeader(new SmallHeading(Util.C.headingProjectCommands()));
    FlowPanel actionsPanel = new FlowPanel();
    actionsPanel.setStyleName(Gerrit.RESOURCES.css().projectActions());
    actionsPanel.setVisible(true);
    actionsGrid.add(Util.C.headingCommands(), actionsPanel);
    for (String id : actions.keySet()) {
      actionsPanel.add(new ActionButton(getProjectKey(),
          actions.get(id)));
    }
  }

  private void doSave() {
    enableForm(false);
    saveProject.setEnabled(false);
    ProjectApi.setConfig(getProjectKey(), descTxt.getText().trim(),
        getBool(contributorAgreements), getBool(contentMerge),
        getBool(signedOffBy), getBool(requireChangeID),
        maxObjectSizeLimit.getText().trim(),
        Project.SubmitType.valueOf(submitType.getValue(submitType.getSelectedIndex())),
        Project.State.valueOf(state.getValue(state.getSelectedIndex())),
        new GerritCallback<ConfigInfo>() {
          @Override
          public void onSuccess(ConfigInfo result) {
            enableForm();
            display(result);
          }

          @Override
          public void onFailure(Throwable caught) {
            enableForm();
            super.onFailure(caught);
          }
        });
  }

  public class ProjectDownloadPanel extends DownloadPanel {
    public ProjectDownloadPanel(String project, boolean isAllowsAnonymous) {
      super(project, null, isAllowsAnonymous);
    }

    @Override
    public void populateDownloadCommandLinks() {
      if (!urls.isEmpty()) {
        if (allowedCommands.contains(DownloadCommand.CHECKOUT)
            || allowedCommands.contains(DownloadCommand.DEFAULT_DOWNLOADS)) {
          commands.add(cmdLinkfactory.new CloneCommandLink());
        }
      }
    }
  }

  private class LabeledWidgetsGrid extends FlexTable {
    private String labelSuffix;

    public LabeledWidgetsGrid() {
      super();
      labelSuffix = ":";
    }

    private void addHeader(Widget widget) {
      int row = getRowCount();
      insertRow(row);
      setWidget(row, 0, widget);
      getCellFormatter().getElement(row, 0).setAttribute("colSpan", "2");
    }

    private void add(String label, boolean labelIsHtml, Widget widget) {
      int row = getRowCount();
      insertRow(row);
      if (label != null) {
        if (labelIsHtml) {
          setHTML(row, 0, label + labelSuffix);
        } else {
          setText(row, 0, label + labelSuffix);
        }
      }
      setWidget(row, 1, widget);
    }

    public void add(String label, Widget widget) {
      add(label, false, widget);
    }

    public void addHtml(String label, Widget widget) {
      add(label, true, widget);
    }

  }
}