package fi.iki.elonen.debug;

import fi.iki.elonen.NanoHTTPD;
import fi.iki.elonen.ServerRunner;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class DebugServer extends NanoHTTPD {
    public DebugServer() {
        super(8080);
    }

    public static void main(String[] args) {
        ServerRunner.run(DebugServer.class);
    }

    @Override public Response serve(IHTTPSession session) {
        Map<String, List<String>> decodedQueryParameters =
            decodeParameters(session.getQueryParameterString());

        StringBuilder sb = new StringBuilder();
        sb.append("<html>");
        sb.append("<head><title>Debug Server</title></head>");
        sb.append("<body>");
        sb.append("<h1>Debug Server</h1>");

        sb.append("<p><blockquote><b>URI</b> = ").append(
            String.valueOf(session.getUri())).append("<br />");

        sb.append("<b>Method</b> = ").append(
            String.valueOf(session.getMethod())).append("</blockquote></p>");

        sb.append("<h3>Headers</h3><p><blockquote>").
            append(toString(session.getHeaders())).append("</blockquote></p>");

        sb.append("<h3>Parms</h3><p><blockquote>").
            append(toString(session.getParms())).append("</blockquote></p>");

        sb.append("<h3>Parms (multi values?)</h3><p><blockquote>").
            append(toString(decodedQueryParameters)).append("</blockquote></p>");

        try {
            Map<String, String> files = new HashMap<String, String>();
            session.parseBody(files);
            sb.append("<h3>Files</h3><p><blockquote>").
                append(toString(files)).append("</blockquote></p>");
        } catch (Exception e) {
            e.printStackTrace();
        }

        sb.append("</body>");
        sb.append("</html>");
        return new Response(sb.toString());
    }

    private String toString(Map<String, ? extends Object> map) {
        if (map.size() == 0) {
            return "";
        }
        return unsortedList(map);
    }

    private String unsortedList(Map<String, ? extends Object> map) {
        StringBuilder sb = new StringBuilder();
        sb.append("<ul>");
        for (Map.Entry entry : map.entrySet()) {
            listItem(sb, entry);
        }
        sb.append("</ul>");
        return sb.toString();
    }

    private void listItem(StringBuilder sb, Map.Entry entry) {
        sb.append("<li><code><b>").append(entry.getKey()).
            append("</b> = ").append(entry.getValue()).append("</code></li>");
    }
}