// Copyright (C) 2009 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.rpc.GerritCallback;
import com.google.gerrit.client.ui.FancyFlexTable;
import com.google.gerrit.common.data.ListBranchesResult;
import com.google.gerrit.common.data.GitwebLink;
import com.google.gerrit.common.errors.InvalidNameException;
import com.google.gerrit.common.errors.InvalidRevisionException;
import com.google.gerrit.reviewdb.Branch;
import com.google.gerrit.reviewdb.Project;
import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
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.user.client.Command;
import com.google.gwt.user.client.DeferredCommand;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter;
import com.google.gwtexpui.globalkey.client.NpTextBox;
import com.google.gwtjsonrpc.client.RemoteJsonException;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ProjectBranchesPanel extends Composite {
  private Project.NameKey projectName;

  private BranchesTable branches;
  private Button delBranch;
  private Button addBranch;
  private NpTextBox nameTxtBox;
  private NpTextBox irevTxtBox;

  private final FlowPanel addPanel = new FlowPanel();

  public ProjectBranchesPanel(final Project.NameKey toShow) {
    final FlowPanel body = new FlowPanel();
    initBranches(body);
    initWidget(body);

    projectName = toShow;
  }

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

    Util.PROJECT_SVC.listBranches(projectName,
        new GerritCallback<ListBranchesResult>() {
          public void onSuccess(final ListBranchesResult result) {
            enableForm(true);
            display(result.getBranches());
            addPanel.setVisible(result.getCanAdd());
          }
        });
  }

  private void display(final List<Branch> listBranches) {
    branches.display(listBranches);
    delBranch.setVisible(branches.hasBranchCanDelete());
  }

  private void enableForm(final boolean on) {
    delBranch.setEnabled(on);
    addBranch.setEnabled(on);
    nameTxtBox.setEnabled(on);
    irevTxtBox.setEnabled(on);
  }

  private void initBranches(final Panel body) {
    addPanel.setStyleName(Gerrit.RESOURCES.css().addSshKeyPanel());

    final Grid addGrid = new Grid(2, 2);

    nameTxtBox = new NpTextBox();
    nameTxtBox.setVisibleLength(50);
    nameTxtBox.setText(Util.C.defaultBranchName());
    nameTxtBox.addStyleName(Gerrit.RESOURCES.css().inputFieldTypeHint());
    nameTxtBox.addFocusHandler(new FocusHandler() {
      @Override
      public void onFocus(FocusEvent event) {
        if (Util.C.defaultBranchName().equals(nameTxtBox.getText())) {
          nameTxtBox.setText("");
          nameTxtBox.removeStyleName(Gerrit.RESOURCES.css().inputFieldTypeHint());
        }
      }
    });
    nameTxtBox.addBlurHandler(new BlurHandler() {
      @Override
      public void onBlur(BlurEvent event) {
        if ("".equals(nameTxtBox.getText())) {
          nameTxtBox.setText(Util.C.defaultBranchName());
          nameTxtBox.addStyleName(Gerrit.RESOURCES.css().inputFieldTypeHint());
        }
      }
    });
    nameTxtBox.addKeyPressHandler(new KeyPressHandler() {
      @Override
      public void onKeyPress(KeyPressEvent event) {
        if (event.getCharCode() == KeyCodes.KEY_ENTER) {
          doAddNewBranch();
        }
      }
    });
    addGrid.setText(0, 0, Util.C.columnBranchName() + ":");
    addGrid.setWidget(0, 1, nameTxtBox);

    irevTxtBox = new NpTextBox();
    irevTxtBox.setVisibleLength(50);
    irevTxtBox.setText(Util.C.defaultRevisionSpec());
    irevTxtBox.addStyleName(Gerrit.RESOURCES.css().inputFieldTypeHint());
    irevTxtBox.addFocusHandler(new FocusHandler() {
      @Override
      public void onFocus(FocusEvent event) {
        if (Util.C.defaultRevisionSpec().equals(irevTxtBox.getText())) {
          irevTxtBox.setText("");
          irevTxtBox.removeStyleName(Gerrit.RESOURCES.css().inputFieldTypeHint());
        }
      }
    });
    irevTxtBox.addBlurHandler(new BlurHandler() {
      @Override
      public void onBlur(BlurEvent event) {
        if ("".equals(irevTxtBox.getText())) {
          irevTxtBox.setText(Util.C.defaultRevisionSpec());
          irevTxtBox.addStyleName(Gerrit.RESOURCES.css().inputFieldTypeHint());
        }
      }
    });
    irevTxtBox.addKeyPressHandler(new KeyPressHandler() {
      @Override
      public void onKeyPress(KeyPressEvent event) {
        if (event.getCharCode() == KeyCodes.KEY_ENTER) {
          doAddNewBranch();
        }
      }
    });
    addGrid.setText(1, 0, Util.C.initialRevision() + ":");
    addGrid.setWidget(1, 1, irevTxtBox);

    addBranch = new Button(Util.C.buttonAddBranch());
    addBranch.addClickHandler(new ClickHandler() {
      @Override
      public void onClick(final ClickEvent event) {
        doAddNewBranch();
      }
    });
    addPanel.add(addGrid);
    addPanel.add(addBranch);

    branches = new BranchesTable();

    delBranch = new Button(Util.C.buttonDeleteBranch());
    delBranch.addClickHandler(new ClickHandler() {
      @Override
      public void onClick(final ClickEvent event) {
        branches.deleteChecked();
      }
    });

    body.add(branches);
    body.add(delBranch);
    body.add(addPanel);
  }

  private void doAddNewBranch() {
    String branchName = nameTxtBox.getText();
    if ("".equals(branchName) || Util.C.defaultBranchName().equals(branchName)) {
      nameTxtBox.setFocus(true);
      return;
    }

    String rev = irevTxtBox.getText();
    if ("".equals(rev) || Util.C.defaultRevisionSpec().equals(rev)) {
      irevTxtBox.setText("HEAD");
      DeferredCommand.addCommand(new Command() {
        @Override
        public void execute() {
          irevTxtBox.selectAll();
          irevTxtBox.setFocus(true);
        }
      });
      return;
    }

    if (!branchName.startsWith(Branch.R_REFS)) {
      branchName = Branch.R_HEADS + branchName;
    }

    addBranch.setEnabled(false);
    Util.PROJECT_SVC.addBranch(projectName, branchName, rev,
        new GerritCallback<ListBranchesResult>() {
          public void onSuccess(final ListBranchesResult result) {
            addBranch.setEnabled(true);
            nameTxtBox.setText("");
            irevTxtBox.setText("");
            display(result.getBranches());
          }

          @Override
          public void onFailure(final Throwable caught) {
            if (caught instanceof InvalidNameException
                || caught instanceof RemoteJsonException
                && caught.getMessage().equals(InvalidNameException.MESSAGE)) {
              nameTxtBox.selectAll();
              nameTxtBox.setFocus(true);

            } else if (caught instanceof InvalidRevisionException
                || caught instanceof RemoteJsonException
                && caught.getMessage().equals(InvalidRevisionException.MESSAGE)) {
              irevTxtBox.selectAll();
              irevTxtBox.setFocus(true);
            }

            addBranch.setEnabled(true);
            super.onFailure(caught);
          }
        });
  }

  private class BranchesTable extends FancyFlexTable<Branch> {
    boolean canDelete;

    BranchesTable() {
      table.setWidth("");
      table.setText(0, 2, Util.C.columnBranchName());
      table.setText(0, 3, Util.C.columnBranchRevision());

      final FlexCellFormatter fmt = table.getFlexCellFormatter();
      fmt.addStyleName(0, 1, Gerrit.RESOURCES.css().iconHeader());
      fmt.addStyleName(0, 2, Gerrit.RESOURCES.css().dataHeader());
      fmt.addStyleName(0, 3, Gerrit.RESOURCES.css().dataHeader());
      if (Gerrit.getConfig().getGitwebLink() != null) {
        fmt.addStyleName(0, 4, Gerrit.RESOURCES.css().dataHeader());
      }
    }

    void deleteChecked() {
      final HashSet<Branch.NameKey> ids = new HashSet<Branch.NameKey>();
      for (int row = 1; row < table.getRowCount(); row++) {
        final Branch k = getRowItem(row);
        if (k != null && table.getWidget(row, 1) instanceof CheckBox
            && ((CheckBox) table.getWidget(row, 1)).getValue()) {
          ids.add(k.getNameKey());
        }
      }
      if (ids.isEmpty()) {
        return;
      }

      Util.PROJECT_SVC.deleteBranch(projectName, ids,
          new GerritCallback<Set<Branch.NameKey>>() {
            public void onSuccess(final Set<Branch.NameKey> deleted) {
              for (int row = 1; row < table.getRowCount();) {
                final Branch k = getRowItem(row);
                if (k != null && deleted.contains(k.getNameKey())) {
                  table.removeRow(row);
                } else {
                  row++;
                }
              }
            }
          });
    }

    void display(final List<Branch> result) {
      canDelete = false;

      while (1 < table.getRowCount())
        table.removeRow(table.getRowCount() - 1);

      for (final Branch k : result) {
        final int row = table.getRowCount();
        table.insertRow(row);
        applyDataRowStyle(row);
        populate(row, k);
      }
    }

    void populate(final int row, final Branch k) {
      final GitwebLink c = Gerrit.getConfig().getGitwebLink();

      if (k.getCanDelete()) {
        table.setWidget(row, 1, new CheckBox());
        canDelete = true;
      } else {
        table.setText(row, 1, "");
      }

      table.setText(row, 2, k.getShortName());

      if (k.getRevision() != null) {
        table.setText(row, 3, k.getRevision().get());
      } else {
        table.setText(row, 3, "");
      }

      if (c != null) {
        table.setWidget(row, 4, new Anchor("(gitweb)", false, c.toBranch(k
            .getNameKey())));
      }

      final FlexCellFormatter fmt = table.getFlexCellFormatter();
      fmt.addStyleName(row, 1, Gerrit.RESOURCES.css().iconCell());
      fmt.addStyleName(row, 2, Gerrit.RESOURCES.css().dataCell());
      fmt.addStyleName(row, 3, Gerrit.RESOURCES.css().dataCell());
      if (c != null) {
        fmt.addStyleName(row, 4, Gerrit.RESOURCES.css().dataCell());
      }

      setRowItem(row, k);
    }

    boolean hasBranchCanDelete() {
      return canDelete;
    }
  }
}