package org.apache.maven.plugin.install;

import org.apache.maven.model.Plugin;
import org.apache.maven.model.PluginExecution;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.util.xml.Xpp3Dom;

import java.util.List;
import javax.annotation.Nullable;

/**
 * Contains the configuration for this plugin.
 */
public class InstallConfiguration {
  public static final InstallConfiguration DEFAULT = new InstallConfiguration(false, false, false);

  @SuppressWarnings("unchecked")
  static InstallConfiguration from(MavenProject project) {
    InstallConfiguration config = InstallConfiguration.DEFAULT;

    for (Plugin p : (List<Plugin>) project.getBuildPlugins()) {
      if ("org.apache.maven.plugins:maven-install-plugin".equals(p.getKey())) {
        Object cfg = p.getConfiguration();
        if (cfg != null) {
          config = InstallConfiguration.from(cfg, config);
        }
        for (PluginExecution e : p.getExecutions()) {
          if ("default-install".equals(e.getId())) {
            config = InstallConfiguration.from(e.getConfiguration(), config);
            break;
          }
        }
        break;
      }
    }
    return config;
  }

  static InstallConfiguration from(Object configurationObject, InstallConfiguration previous) {
    if (configurationObject instanceof Xpp3Dom) {
      return from((Xpp3Dom) configurationObject, previous);
    }
    throw new IllegalStateException("Unknown configuration type : " + configurationObject.getClass().getName());
  }

  private static InstallConfiguration from(Xpp3Dom cfg, InstallConfiguration previous) {
    Boolean createChecksum = readBooleanValue(cfg, "createChecksum");
    Boolean updateReleaseInfo = readBooleanValue(cfg, "updateReleaseInfo");
    Boolean skip = readBooleanValue(cfg, "skip");
    return new InstallConfiguration(previous, createChecksum, updateReleaseInfo, skip);
  }

  @Nullable
  private static Boolean readBooleanValue(Xpp3Dom element, String name) {
    Xpp3Dom[] children = element.getChildren(name);
    return (children.length > 0) ? Boolean.parseBoolean(children[0].getValue()) : null;
  }

  @Nullable
  private final InstallConfiguration previous;
  @Nullable
  private final Boolean createChecksum;
  @Nullable
  private final Boolean updateReleaseInfo;
  @Nullable
  private final Boolean skip;

  private InstallConfiguration(boolean createChecksum, boolean updateReleaseInfo, boolean skip) {
    this.previous = null;
    this.createChecksum = createChecksum;
    this.updateReleaseInfo = updateReleaseInfo;
    this.skip = skip;
  }

  private InstallConfiguration(InstallConfiguration previous,
                               Boolean createChecksum, Boolean updateReleaseInfo, Boolean skip) {
    this.previous = previous;
    this.createChecksum = createChecksum;
    this.updateReleaseInfo = updateReleaseInfo;
    this.skip = skip;
  }

  public boolean createChecksum() {
    return createChecksum!=null ? createChecksum : previous.createChecksum();
  }

  public boolean updateReleaseInfo() {
    return updateReleaseInfo!=null ? updateReleaseInfo : previous.updateReleaseInfo();
  }

  public boolean skip() {
    return skip!=null ? skip : previous.skip();
  }
}