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package com.avaje.ebean.enhance.agent;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.TreeSet;

/**
 * Distill packages into distinct top level packages for searching.
 */
class DistillPackages {

  private TreeSet treeSet = new TreeSet();

  /**
   * Add packages that we want to distill.
   */
  DistillPackages add(Collection packages) {
    if (packages != null) {
      treeSet.addAll(packages);
    }
    return this;
  }

  /**
   * Add a raw entry splitting it into individual packages by delimiters.
   */
  DistillPackages addRaw(String packages) {
    if (packages != null) {
      String[] split = packages.split(",|;| ");
      for (int i = 0; i < split.length; i++) {
        String pkg = split[i].trim();
        if (!pkg.isEmpty()) {
          treeSet.add(pkg);
        }
      }
    }
    return this;
  }

  /**
   * Distill the list of packages into distinct top level packages.
   */
  List distill() {

    List distilled = new ArrayList();

    // build the distilled list
    for (String pack : treeSet) {
      if (notAlreadyContained(distilled, pack)) {
        distilled.add(pack);
      }
    }

    return distilled;
  }

  /**
   * Return true if the package is not already contained in the distilled list.
   */
  private boolean notAlreadyContained(List distilled, String pack) {

    for (int i = 0; i < distilled.size(); i++) {
      if (pack.startsWith(distilled.get(i))) {
        return false;
      }
    }
    return true;
  }
}