package nabble.view.lib;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


// used outside nabble, so do not use Init
public final class HtmlViewUtils {

	private HtmlViewUtils() {}  // never


	/** Number of pages to be displayed before/after the current page*/
	public static final int NEIGHBOR_PAGES = 3;

	public static interface PagingPath {
		public String path(int row);
	}

	public static final class GenericPagingPath implements PagingPath {
		private final String url;

		public GenericPagingPath(String url) {
			this.url = url;
		}

		public String path(int row) {
			return url + (row==0 ? "" : "&i=" + row);
		}
	}

	public static void genericPaging(HttpServletRequest request,HttpServletResponse response, int count, int currentRecord, int maxRows, PagingPath pagingPath, String margins)
		throws IOException
	{
		genericPaging(request, response, count, currentRecord, maxRows, pagingPath, margins, false, NEIGHBOR_PAGES);
	}

	public static void genericPaging(HttpServletRequest request,HttpServletResponse response, int count, int currentRecord, int maxRows, PagingPath pagingPath, String margins, boolean hideLastPage,int NEIGHBOR_PAGES)
		throws IOException
	{
		PrintWriter out = response.getWriter();
		if (count > maxRows) {
			
		out.print( "\r\n<style type=\"text/css\">\r\n	span.page { padding: .1em .3em }\r\n	span.current-page { border-width:1px; border-style:solid; }\r\n</style>\r\n<span style=\"float:right;white-space:nowrap;padding:" );
		out.print( (margins) );
		out.print( ";font-weight:normal\">\r\n	" );

					int currentPage = (currentRecord / maxRows) + 1;
					int lastPage = count / maxRows;
					// If there are more items on the next page...
					if (count % maxRows > 0)
						lastPage++; // ... I increment the last page.

					int before = currentPage - NEIGHBOR_PAGES;
					int after = currentPage + NEIGHBOR_PAGES;
					if (before <= 1) {
						// Among the first pages
						int limit = Math.min(currentPage + NEIGHBOR_PAGES, lastPage);

						for (int i = 1; i <= limit; i++) {
							if (i == currentPage) {
								
		out.print( "\r\n<span class=\"current-page page medium-border-color\">" );
		out.print( (i) );
		out.print( "</span>\r\n" );

							} else {
								int page = (i-1) * maxRows;
								
		out.print( "\r\n	<span class=\"page\">\r\n		<a href=\"" );
		out.print( (pagingPath.path(page)) );
		out.print( "\" title=\"page " );
		out.print( (i) );
		out.print( "\">" );
		out.print( (i) );
		out.print( "</a>\r\n	</span>\r\n" );

							}
						}

						if (limit < lastPage) {
							int page = (lastPage-1) * maxRows;
							boolean atEnd = after == lastPage-1;
							
		out.print( "\r\n" );
		out.print( (atEnd? "" : "...") );
		out.print( "\r\n" );
 if (!hideLastPage || atEnd) { 
		out.print( "\r\n<span class=\"page\">\r\n	<a href=\"" );
		out.print( (pagingPath.path(page)) );
		out.print( "\" title=\"page " );
		out.print( (lastPage) );
		out.print( "\"" );
		out.print( (atEnd? "" : " rel=\"nofollow\"") );
		out.print( ">" );
		out.print( (lastPage) );
		out.print( "</a>\r\n</span>\r\n" );
 } 
		out.print( "\r\n" );

						}
					} else if (before > 1 && after < lastPage) {
						// In the middle pages
						
		out.print( "\r\n<span class=\"page\">\r\n	<a href=\"" );
		out.print( (pagingPath.path(0)) );
		out.print( "\" title=\"page 1\">1</a>\r\n</span>\r\n" );
		out.print( (before == 2? "" : "...") );
		out.print( "\r\n" );

						int limit = before + 2 * NEIGHBOR_PAGES;
						for (int i = before; i <= limit; i++) {
							if (i == currentPage) {
								
		out.print( "<span class=\"current-page page medium-border-color\">" );
		out.print( (i) );
		out.print( "</span>" );

							} else {
								int page = (i-1) * maxRows;
								
		out.print( "\r\n	<span class=\"page\">\r\n		<a href=\"" );
		out.print( (pagingPath.path(page)) );
		out.print( "\" title=\"page " );
		out.print( (i) );
		out.print( "\">" );
		out.print( (i) );
		out.print( "</a>\r\n	</span>\r\n" );

							}
						}

						if (limit < lastPage) {
							int page = (lastPage-1) * maxRows;
							boolean atEnd = after == lastPage-1;
							
		out.print( "\r\n" );
		out.print( (atEnd? "" : "...") );
		out.print( "\r\n" );
 if (!hideLastPage || atEnd) { 
		out.print( "\r\n<span class=\"page\">\r\n	<a href=\"" );
		out.print( (pagingPath.path(page)) );
		out.print( "\" title=\"page " );
		out.print( (lastPage) );
		out.print( "\"" );
		out.print( (atEnd? "" : " rel=\"nofollow\"") );
		out.print( ">" );
		out.print( (lastPage) );
		out.print( "</a>\r\n</span>\r\n" );
 } 
		out.print( "\r\n" );

						}
					} else {
						// Among the last pages
						
		out.print( "\r\n<span class=\"page\">\r\n	<a href=\"" );
		out.print( (pagingPath.path(0)) );
		out.print( "\" title=\"page 1\">1</a>\r\n</span>\r\n" );
		out.print( (before == 2? "" : "...") );
		out.print( "\r\n" );

						for (int i = before; i <= lastPage; i++) {
							if (i == currentPage) {
								
		out.print( "<span class=\"current-page page medium-border-color\">" );
		out.print( (i) );
		out.print( "</span>" );

							} else {
								int page = (i-1) * maxRows;
								
		out.print( "\r\n	<span class=\"page\">\r\n		<a href=\"" );
		out.print( (pagingPath.path(page)) );
		out.print( "\" title=\"page " );
		out.print( (i) );
		out.print( "\">" );
		out.print( (i) );
		out.print( "</a>\r\n	</span>\r\n" );

							}
						}
					}
				
		out.print( "\r\n</span>\r\n" );

		}
	}

	public static void googleAnalytics(PrintWriter out) {
		
		out.print( "\r\n<script>\r\n	(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){\r\n	(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),\r\n	m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)\r\n	})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');\r\n	\r\n	ga('create', 'UA-91855-9', 'auto', 'nabble');\r\n	ga('nabble.send', 'pageview');\r\n</script>\r\n" );

	}

}