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package edu.byu.hbll.box;

import com.fasterxml.jackson.annotation.JsonProperty;
import java.io.Serializable;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * Represents a facet. Immutable.
 *
 * @author Charles Draper
 */
public final class Facet implements Serializable {

  private static final long serialVersionUID = 1L;

  /** The name of the facet. */
  @JsonProperty private String name;
  /** The facet vlaue. */
  @JsonProperty private String value;

  /** Constructor for serializers/deserializers. */
  @SuppressWarnings("unused")
  private Facet() {}

  /**
   * Creates a new {@link Facet} with the given name and value.
   *
   * @param name name of the facet group
   * @param value value of the facet
   */
  public Facet(String name, String value) {
    this.name = validateName(name);
    this.value = Objects.requireNonNull(value);
  }

  @Override
  public int hashCode() {
    return Objects.hash(name, value);
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }

    if (!(o instanceof Facet)) {
      return false;
    }

    Facet other = (Facet) o;

    return Objects.equals(name, other.name) && Objects.equals(value, other.value);
  }

  @Override
  public String toString() {
    return name + ":" + value;
  }

  /**
   * Validates a facet group name. Facet names must contain only characters in [0-9A-Za-z_].
   *
   * @param name name of the facet group
   * @return whether or not the name is valid
   */
  public static String validateName(String name) {
    if (name == null || !name.matches("[0-9A-Za-z_]+")) {
      throw new IllegalArgumentException("facet keys must be alphanumeric");
    }

    return name;
  }

  /**
   * Parses a facet value in the form of "NAME:VALUE".
   *
   * @param facet the facet value
   * @return the parsed facet
   */
  public static Facet parse(String facet) {
    return new Facet(validateName(facet.replaceFirst(":.+", "")), facet.replaceFirst(".+?:", ""));
  }

  /**
   * Parses facet values in the form of "NAME:VALUE".
   *
   * @param facets the facets to parse
   * @return the parsed facets
   */
  public static List parse(Collection facets) {
    return facets.stream().map(f -> parse(f)).collect(Collectors.toList());
  }

  /**
   * Utility method for grouping facets by name.
   *
   * @param facets a collection of facets
   * @return a map of group name to a set of corresponding facets
   */
  public static Map> group(Collection facets) {
    Map> facetMap = new LinkedHashMap<>();

    for (Facet facet : facets) {
      facetMap.computeIfAbsent(facet.getName(), f -> new LinkedHashSet<>()).add(facet);
    }

    return facetMap;
  }

  /**
   * Returns the name of the facet.
   *
   * @return the name of the facet
   */
  public String getName() {
    return name;
  }

  /**
   * Returns the value of the facet.
   *
   * @return the value of the facet.
   */
  public String getValue() {
    return value;
  }
}