package org.kuali.maven.common;

 import java.util.Collection;

 import org.apache.commons.lang.StringUtils;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.apache.maven.project.MavenProject;

 public class UrlBuilder {

     private static final Log log = LogFactory.getLog(UrlBuilder.class);

     protected boolean isTargetGroupId(final MavenProject project, final String organizationGroupId) {

         // Return false if we can't do a meaningful comparison

         if (project == null || organizationGroupId == null) {

             return false;

         }

         // Check that it matches our target groupId

         return organizationGroupId.equals(project.getGroupId());

     }

     protected String getTrimmedGroupId(final MavenProject project, final String organizationGroupId) {

         String groupId = project.getGroupId();

         if (StringUtils.isEmpty(organizationGroupId)) {

             return groupId;

         }

         if (!groupId.startsWith(organizationGroupId)) {

             log.warn("Group Id: '" + groupId + "' does not start with '" + organizationGroupId + "'");

             return groupId;

         }

         String s = StringUtils.replace(groupId, organizationGroupId, "");

         if (s.startsWith(".")) {

             s = s.substring(1);

         }

         s = s.replace(".", "/");

         return s;

     }

     protected boolean isAppendArtifactId(final MavenProject project, final String trimmedGroupId) {

         // Always append the artifactId for single module projects

         if (isEmpty(project.getModules())) {

             return true;

         }

         // Always append the artifactId if it is different than the final portion of the groupId

         if (!trimmedGroupId.endsWith(project.getArtifactId())) {

             return true;

         }

         /**

          * We have a multi-module build where the artifactId for the top level project is the same as the final portion

          * of the groupId.<br>

          * eg org.kuali.rice:rice Return false here so the public url is:<br>

          * http://site.kuali.org/rice/1.0.3<br>

          * instead of<br>

          * http://site.kuali.org/rice/rice/1.0.3<br>

          */

         return false;

     }

     public String getSitePath(final MavenProject project, final String organizationGroupId) {

         String trimmedGroupId = getTrimmedGroupId(project, organizationGroupId);

         StringBuilder sb = new StringBuilder(trimmedGroupId);

         if (isAppendArtifactId(project, trimmedGroupId)) {

             if (sb.length() > 0) {

                 sb.append("/");

             }

             sb.append(project.getArtifactId());

         }

         return sb.toString();

     }

     protected boolean isEmpty(final Collection<?> c) {

         if (c == null) {

             return true;

         }

         if (c.isEmpty()) {

             return true;

         }

         return false;

     }

     protected String getBaseUrl(final String protocol, final String hostname, final MavenProject project,

             final SiteContext context) {

         StringBuilder sb = new StringBuilder();

         sb.append(protocol);

         sb.append("://");

         sb.append(hostname);

         sb.append("/");

         sb.append(getSitePath(project, context.getOrganizationGroupId()));

         sb.append("/");

         sb.append(project.getVersion());

         sb.append("/");

         return sb.toString();

     }

     protected boolean isBaseCase(final MavenProject project, final String organizationGroupId) {

         // If this is the organizations groupId return true

         // This happens when using Maven to generate a site about the Kuali parent pom itself

         if (isTargetGroupId(project, organizationGroupId)) {

             return true;

         }

         // Otherwise, inspect the parent project

         MavenProject parent = project.getParent();

         // If there is no parent, return true

         if (parent == null) {

             return true;

         }

         // If the parent groupId is the organizations groupId return true

         if (isTargetGroupId(parent, organizationGroupId)) {

             return true;

         }

         // False otherwise

         return false;

     }

     public String getPublicUrl(final MavenProject project, final SiteContext context) {

         String organizationGroupId = context.getOrganizationGroupId();

         if (isBaseCase(project, organizationGroupId)) {

             return getBaseUrl(context.getPublicUrlProtocol(), context.getHostname(), project, context);

         } else {

             return getPublicUrl(project.getParent(), context) + project.getArtifactId() + "/";

         }

     }

     public String getPublishUrl(final MavenProject project, final SiteContext context) {

         String organizationGroupId = context.getOrganizationGroupId();

         if (isBaseCase(project, organizationGroupId)) {

             return getBaseUrl(context.getPublishUrlProtocol(), context.getBucket(), project, context);

         } else {

             return getPublishUrl(project.getParent(), context) + project.getArtifactId() + "/";

         }

     }

     public boolean isSnapshot(final MavenProject project) {

         String version = project.getVersion();

         int pos = version.toUpperCase().indexOf("SNAPSHOT");

         boolean isSnapshot = pos != -1;

         return isSnapshot;

     }

     public MavenProject getMavenProject(final String groupId, final String artifactId, final String packaging) {

         MavenProject project = new MavenProject();

         project.setGroupId(groupId);

         project.setArtifactId(artifactId);

         project.setPackaging(packaging);

         return project;

     }

     public String getDownloadUrl(final MavenProject project, final SiteContext context) {

         String prefix = context.getDownloadPrefix();

         StringBuilder sb = new StringBuilder();

         sb.append(prefix);

         if (!prefix.endsWith("/")) {

             sb.append("/");

         }

         if (isSnapshot(project)) {

             sb.append(context.getDownloadSnapshotPrefix());

         } else {

             sb.append(context.getDownloadReleasePrefix());

         }

         sb.append("/");

         String groupId = project.getGroupId();

         sb.append(groupId.replace('.', '/'));

         sb.append("/");

         sb.append(project.getArtifactId());

         sb.append("/");

         sb.append(project.getVersion());

         sb.append("/");

         return sb.toString();

     }

 }