/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

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.security.zynamics.zylib.gui.zygraph.helpers;

import com.google.security.zynamics.zylib.gui.zygraph.realizers.ZyLabelContent;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;


public class HtmlGenerator {
  private static Map<String, String> initLineCache = new HashMap<String, String>();

  public static String escapeHtml(final String str) {
    final StringBuffer buf = new StringBuffer();
    final int len = str == null ? 0 : str.length();

    for (int i = 0; i < len; i++) {
      final char ch = str.charAt(i);
      if (Character.isLetterOrDigit(ch)) {
        buf.append(ch);
      } else {
        buf.append("&#" + (int) ch + ";");
      }
    }
    return buf.toString();
  }

  public static String getHtml(final Collection<String> strings, final String fontname,
      final boolean boldFirstLine) {
    final StringBuilder html =
        new StringBuilder(String.format("<html><font face=\"%s\" size=\"3\" color=\"000000\">",
            fontname));

    boolean first = true;

    for (final String string : strings) {
      html.append(boldFirstLine && first ? "<b>" : "");
      html.append(escapeHtml(string));
      html.append(boldFirstLine && first ? "</b>" : "");
      html.append("<br>");

      first = false;
    }

    html.append("</font></html>");

    return html.toString();
  }

  public static String getHtml(final ZyLabelContent content, final String fontname,
      final boolean boldFirstLine) {
    return getHtml(content, fontname, boldFirstLine, false);
  }

  public static String getHtml(final ZyLabelContent content, final String fontname,
      final boolean boldFirstLine, final boolean eliminateEmptyLines) {
    if (!initLineCache.containsKey(fontname)) {
      initLineCache.put(fontname,
          String.format("<html><font face=\"%s\" size=\"3\" color=\"000000\">", fontname));
    }

    final StringBuilder html = new StringBuilder(initLineCache.get(fontname));

    final int tooltipMaxLength = content.getLineCount() >= 40 ? 40 : content.getLineCount();

    for (int i = 0; i < tooltipMaxLength; ++i) {
      final String text = content.getLineContent(i).getText();
      if (eliminateEmptyLines) {
        if ((text.length() < 1) || text.equals("\n") || text.equals("\r") || text.equals("\t")) {
          continue;
        }
      }

      html.append(boldFirstLine && (i == 0) ? "<b>" : "");
      html.append(escapeHtml(text));
      html.append(boldFirstLine && (i == 0) ? "</b>" : "");
      html.append("<br>");
    }
    if (content.getLineCount() > 40) {
      html.append("...");
      html.append("<br>");
    }

    html.append("</font></html>");

    return html.toString();
  }

  public static String getHtml(final ZyLabelContent contentOne, final ZyLabelContent contentTwo,
      final String fontname, final boolean boldFirstLine) {
    return getHtml(contentOne, contentTwo, fontname, boldFirstLine, false);
  }

  public static String getHtml(final ZyLabelContent contentOne, final ZyLabelContent contentTwo,
      final String fontname, final boolean boldFirstLine, final boolean eliminateEmptyLines) {
    final StringBuilder html =
        new StringBuilder(String.format("<html><font face=\"%s\" size=\"3\" color=\"000000\">",
            fontname));

    for (int i = 0; i < contentOne.getLineCount(); ++i) {
      final String text = contentOne.getLineContent(i).getText();
      if (eliminateEmptyLines) {
        if ((text.length() < 1) || text.equals("\n") || text.equals("\r") || text.equals("\t")) {
          continue;
        }
      }

      html.append(boldFirstLine && (i == 0) ? "<b>" : "");
      html.append(escapeHtml(contentOne.getLineContent(i).getText()));
      html.append(boldFirstLine && (i == 0) ? "</b>" : "");
      html.append("<br>");
    }

    html.append("</font>");
    html.append("<hr></hr>");
    html.append(String.format("<font face=\"%s\" size=\"3\" color=\"000000\">", fontname));

    for (int i = 0; i < contentTwo.getLineCount(); ++i) {
      final String text = contentTwo.getLineContent(i).getText();
      if (eliminateEmptyLines) {
        if ((text.length() < 1) || text.equals("\n") || text.equals("\r") || text.equals("\t")) {
          continue;
        }
      }

      html.append(boldFirstLine && (i == 0) ? "<b>" : "");
      html.append(escapeHtml(contentTwo.getLineContent(i).getText()));
      html.append(boldFirstLine && (i == 0) ? "</b>" : "");
      html.append("<br>");
    }

    html.append("</font></html>");

    return html.toString();
  }

}