/*
 * Copyright (c) Robert Bosch GmbH. All rights reserved.
 */
package org.eclipse.blockchain.ui.views;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.blockchain.core.BlockchainCore;
import org.eclipse.blockchain.core.CoreCommandExecutor;
import org.eclipse.blockchain.ui.Activator;
import org.eclipse.blockchain.ui.util.UIUtilities;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.DirectoryDialog;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * @author ADG5COB
 */
public class GethServerDialog extends Dialog {

  private Text dataDirText;
  private Text initFileText;
  private final String userDir = System.getProperty("user.dir");
  private String networkId = "";
  private Label networkIdLabel;
  private final Map<String, String> gethOptions = new HashMap<>();
  private String dataDirectory = "";
  private String genesisFile = "";

  /**
   * @return -
   */
  public String getDataDirectory() {
    return this.dataDirectory;
  }

  /**
   * @return -
   */
  public String getGenesisFile() {
    return this.genesisFile;
  }

  /**
   * @return -
   */
  public Map<String, String> getGethOptions() {
    return this.gethOptions;
  }

  /**
   * @param parentShell -
   */
  public GethServerDialog(final Shell parentShell) {
    super(parentShell);
    populateGethOptions();
  }

  private void populateGethOptions() {
    this.gethOptions.put("rpc", "");
    this.gethOptions.put("rpccorsdomain", "*");
    this.gethOptions.put("rpcapi", "db,eth,net,web3,personal");
    this.gethOptions.put("gcmode", "archive");
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void configureShell(final Shell shell) {
    super.configureShell(shell);
    shell.setText("Geth Server Setup");
    shell.setSize(300, 400);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected Control createDialogArea(final Composite parent) {
    Composite containerComp = new Composite(parent, SWT.None);
    containerComp.setLayout(new GridLayout(3, false));
    containerComp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

    createContent(containerComp);
    UIUtilities.moveShellToCenterOfScreen(Display.getDefault(), parent.getShell());
    return parent;
  }

  private void createContent(final Composite containerComp) {
    // First Layer
    Label dataDirLabel = new Label(containerComp, SWT.None);
    dataDirLabel.setText("Data Directory");
    dataDirLabel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false));

    this.dataDirText = new Text(containerComp, SWT.BORDER);
    this.dataDirText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
    this.dataDirText.setText("C:\\Deepthi\\BlockChain\\Account\\Node4");
    this.dataDirText.setToolTipText(this.dataDirText.getText());

    Button dataDirBrowse = new Button(containerComp, SWT.PUSH);
    dataDirBrowse.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false));
    dataDirBrowse.setText("Browse");
    dataDirBrowse.addSelectionListener(new SelectionAdapter() {

      /**
       * {@inheritDoc}
       */
      @Override
      public void widgetSelected(final SelectionEvent e) {
        getAndSetSelectedDirectoryNode(containerComp, GethServerDialog.this.dataDirText);
      }
    });

    // Second Layer
    Label initFileLabel = new Label(containerComp, SWT.None);
    initFileLabel.setText("Init File");
    initFileLabel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false));

    this.initFileText = new Text(containerComp, SWT.BORDER);
    this.initFileText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
    this.initFileText.setText("");
    this.initFileText.setToolTipText(this.initFileText.getText());

    Button initFileBrowse = new Button(containerComp, SWT.PUSH);
    initFileBrowse.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false));
    initFileBrowse.setText("Browse");
    initFileBrowse.addSelectionListener(new SelectionAdapter() {

      /**
       * {@inheritDoc}
       */
      @Override
      public void widgetSelected(final SelectionEvent e) {
        getandSetSelectedGenesisFile(containerComp, GethServerDialog.this.initFileText);
      }
    });

    // Scrolled Composite - contains network values
    ScrolledComposite networkComposite = new ScrolledComposite(containerComp, SWT.V_SCROLL | SWT.BORDER);
    networkComposite.setLayout(new GridLayout(1, false));
    networkComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false, 3, 0));
    Composite networkChild = createdScrolledContent(networkComposite);

    networkComposite.setContent(networkChild);
    networkComposite.setMinSize(networkComposite.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    networkComposite.setExpandHorizontal(true);
    networkComposite.setExpandVertical(true);
    networkComposite.layout();
  }

  private Composite createdScrolledContent(final ScrolledComposite scrolledComposite) {
    /**
     * This contains the geth arguments which should be made configurable, as of now its static but networkId will be
     * read from the genesis file
     */
    Composite childComp = new Composite(scrolledComposite, SWT.None);
    childComp.setLayout(new GridLayout(1, false));
    childComp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

    Group networkGroup = new Group(childComp, SWT.BORDER);
    networkGroup.setLayout(new GridLayout(1, false));
    networkGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    networkGroup.setText("Network");

    this.networkIdLabel = new Label(networkGroup, SWT.None | SWT.READ_ONLY);
    this.networkIdLabel.setText("Network ID : " +
        (this.networkId.isEmpty() ? CoreCommandExecutor.getInstance().getDefaultNetworkIdForGeth() : this.networkId));

    Group rpcGroup = new Group(childComp, SWT.BORDER);
    rpcGroup.setLayout(new GridLayout(1, false));
    rpcGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    rpcGroup.setText("RPC");

    for (Map.Entry<String, String> entry : this.gethOptions.entrySet()) {
      Label lab = new Label(rpcGroup, SWT.None);
      String val = entry.getValue();
      lab.setText(entry.getKey() + (val.isEmpty() ? "" : " : " + val));
    }
    return childComp;
  }

  private void getandSetSelectedGenesisFile(final Composite parent, final Text textWidget) {
    FileDialog dataDir = new FileDialog(parent.getShell());
    dataDir.setFilterPath(this.userDir);
    String selectedDir = dataDir.open();
    textWidget.setText(selectedDir);
    try (BufferedReader br = new BufferedReader(new FileReader(new File(selectedDir)))) {
      String contents = "";
      while ((contents = br.readLine()) != null) {
        if (contents.contains("chainId")) {
          this.networkId = contents.substring(contents.indexOf(':') + 1).replace(",", "").trim();
          this.networkIdLabel.setText("Network ID : " + this.networkId);
          this.networkIdLabel.getParent().layout();
        }
      }
    }
    catch (IOException e) {
      BlockchainCore.getInstance().logException(Activator.PLUGIN_ID, e.getMessage(), e);
    }
  }

  private void getAndSetSelectedDirectoryNode(final Composite parent, final Text textWidget) {
    DirectoryDialog dirDialog = new DirectoryDialog(parent.getShell());
    dirDialog.setFilterPath(this.userDir);
    String selectedDir = dirDialog.open();
    textWidget.setText(selectedDir);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void okPressed() {
    this.dataDirectory = this.dataDirText.getText();
    this.genesisFile = this.initFileText.getText();
    super.okPressed();
  }

}