package divconq.web.md.plugin;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;

import divconq.web.md.Plugin;
import divconq.web.md.ProcessContext;
import divconq.xml.XElement;

public class WebSequencePlugin extends Plugin {

	public WebSequencePlugin() {
		super("sequence");
	}
	
	@Override
	public void emit(ProcessContext ctx, XElement parent, List<String> lines,
			Map<String, String> params) {
		// TODO Auto-generated method stub
		
	}
	
	/*
	@Override
	public void emit(final StringBuilder out, final List<String> lines, final Map<String, String> params) {
		String style = params.get("style");
		if(style == null) {
			style = "default";			
		}
		String content = null;
		for(String line : lines) {
			if(content == null) {
				content = line;
			}
			else {
				content = content + "\n" + line;				
			}
		}
		
		content = content + "\n";
		
		try {
			String link = getSequenceDiagram(content, style);
			
			if(link != null) {
				out.append("<img src=\"");
				out.append(link);
				out.append("\"/>");			
			}
		} catch (IOException e) {
			throw new RuntimeException("Error while rendering websequenceplugin", e);
		}
	}
	*/
	
	protected String getSequenceDiagram(String text, String style) throws IOException {
            //Build parameter string
            String data = "style=" + style + "&message=" +  URLEncoder.encode( text, "UTF-8" ) + "&apiVersion=1";
            
            // Send the request
            URL url = new URL("http://www.websequencediagrams.com");
            URLConnection conn = url.openConnection();
            conn.setDoOutput(true);
            OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
            
            //write parameters
            writer.write(data);
            writer.flush();
            
            // Get the response
            StringBuffer answer = new StringBuffer();
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                answer.append(line);
            }
            writer.close();
            reader.close();

            String json = answer.toString();
            
            int start = json.indexOf( "?png=" );
            int end = json.indexOf( "\"", start );
            
            if(start != -1 && end != -1) {
                String surl =  "http://www.websequencediagrams.com/" + json.substring(start, end) ;	            	            
                return surl;            	
            }
            return null;
            	            
   }
}