/*******************************************************************************
 *
 * Copyright (c) 2004-2009 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * 
 *    Kohsuke Kawaguchi
 *
 *
 *******************************************************************************/ 

package hudson.model;

import hudson.EnvVars;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.apache.commons.lang3.StringUtils;
import org.kohsuke.stapler.StaplerRequest;
import org.kohsuke.stapler.StaplerResponse;
import org.kohsuke.stapler.Stapler;

import javax.servlet.ServletException;
import java.io.IOException;

import hudson.search.SearchableModelObject;
import hudson.search.Search;
import hudson.search.SearchIndexBuilder;
import hudson.search.SearchIndex;

/**
 * {@link ModelObject} with some convenience methods.
 *
 * @author Kohsuke Kawaguchi
 * @author Nikita Levyankov
 */
public abstract class AbstractModelObject implements SearchableModelObject {

    /**
     * Displays the error in a page.
     */
    protected final void sendError(Exception e, StaplerRequest req, StaplerResponse rsp) throws ServletException, IOException {
        sendError(e.getMessage(), req, rsp);
    }

    protected final void sendError(Exception e) throws ServletException, IOException {
        sendError(e, Stapler.getCurrentRequest(), Stapler.getCurrentResponse());
    }

    protected final void sendError(String message, StaplerRequest req, StaplerResponse rsp) throws ServletException, IOException {
        req.setAttribute("message", message);
        rsp.forward(this, "error", req);
    }

    /**
     * @param pre If true, the message is put in a PRE tag.
     */
    protected final void sendError(String message, StaplerRequest req, StaplerResponse rsp, boolean pre) throws ServletException, IOException {
        req.setAttribute("message", message);
        if (pre) {
            req.setAttribute("pre", true);
        }
        rsp.forward(this, "error", req);
    }

    protected final void sendError(String message) throws ServletException, IOException {
        sendError(message, Stapler.getCurrentRequest(), Stapler.getCurrentResponse());
    }

    /**
     * Convenience method to verify that the current request is a POST request.
     */
    protected final void requirePOST() throws ServletException {
        StaplerRequest req = Stapler.getCurrentRequest();
        if (req == null) {
            return; // invoked outside the context of servlet
        }
        String method = req.getMethod();
        if (!method.equalsIgnoreCase("POST")) {
            throw new ServletException("Must be POST, Can't be " + method);
        }
    }

    /**
     * Checks jndi,environment, hudson environment and system properties for
     * specified key. Property is checked in direct order: <ol> <li>JNDI
     * ({@link InitialContext#lookup(String)})</li> <li>Hudson environment
     * ({@link EnvVars#masterEnvVars})</li> <li>System properties
     * ({@link System#getProperty(String)})</li> </ol>
     *
     * @param key - the name of the configured property.
     * @return the string value of the configured property, or null if there is
     * no property with that key.
     */
    protected String getConfiguredHudsonProperty(String key) {
        if (StringUtils.isNotBlank(key)) {
            String resultValue;
            try {
                InitialContext iniCtxt = new InitialContext();
                Context env = (Context) iniCtxt.lookup("java:comp/env");
                resultValue = StringUtils.trimToNull((String) env.lookup(key));
                if (null != resultValue) {
                    return resultValue;
                }
                // look at one more place. See http://issues.hudson-ci.org/browse/HUDSON-1314
                resultValue = StringUtils.trimToNull((String) iniCtxt.lookup(key));
                if (null != resultValue) {
                    return resultValue;
                }
            } catch (NamingException e) {
                // ignore
            }

            // look at the env var next
            resultValue = StringUtils.trimToNull(EnvVars.masterEnvVars.get(key));
            if (null != resultValue) {
                return resultValue;
            }

            // finally check the system property
            resultValue = StringUtils.trimToNull(System.getProperty(key));
            if (null != resultValue) {
                return resultValue;
            }
        }
        return null;
    }

    /**
     * Default implementation that returns empty index.
     */
    protected SearchIndexBuilder makeSearchIndex() {
        return new SearchIndexBuilder().addAllAnnotations(this);
    }

    public final SearchIndex getSearchIndex() {
        return makeSearchIndex().make();
    }

    public Search getSearch() {
        return new Search();
    }

    /**
     * Default implementation that returns the display name.
     */
    public String getSearchName() {
        return getDisplayName();
    }
}