package com.minres.rdl.generator;

/**
 * This class holds all the data for an option. This includes the prefix, the key, the separator 
 * (for value options), the multiplicity, and all the other settings describing the option. The class
 * is designed to be only a data container from a user perspective, i. e. the user has read-access to 
 * any data determined by the {@link Options#check()}, but not access to any of the other methods
 * which are used internally for the operation of the actual check. 
 */

public class OptionData {

  private final static String CLASS = "OptionData";

  private Options.Prefix              prefix       = null;
  private String                      key          = null; 
  private boolean                     detail       = false; 
  private Options.Separator           separator    = null; 
  private boolean                     value        = false; 
  private Options.Multiplicity        multiplicity = null;
  private java.util.regex.Pattern     pattern      = null;
  private int                         counter      = 0;
  private java.util.ArrayList<String> values       = null;
  private java.util.ArrayList<String> details      = null;

/**
 * The constructor
 */

  OptionData(Options.Prefix prefix, 
             String key, 
             boolean detail, 
             Options.Separator separator, 
             boolean value, 
             Options.Multiplicity multiplicity) {

    if (prefix       == null) throw new IllegalArgumentException(CLASS + ": prefix may not be null");
    if (key          == null) throw new IllegalArgumentException(CLASS + ": key may not be null");
    if (separator    == null) throw new IllegalArgumentException(CLASS + ": separator may not be null");
    if (multiplicity == null) throw new IllegalArgumentException(CLASS + ": multiplicity may not be null");

//.... The data describing the option

    this.prefix       = prefix;
    this.key          = key;
    this.detail       = detail;
    this.separator    = separator;
    this.value        = value;
    this.multiplicity = multiplicity;

//.... Create the pattern to match this option

    if (value) {
      if (separator == Options.Separator.BLANK) {
        if (detail) {
          pattern = java.util.regex.Pattern.compile(prefix.getName() + key + "((\\w|\\.)+)$");
        } else {
          pattern = java.util.regex.Pattern.compile(prefix.getName() + key + "$");
        }
      } else {
        if (detail) {
          pattern = java.util.regex.Pattern.compile(prefix.getName() + key + "((\\w|\\.)+)" + separator.getName() + "(.+)$");
        } else {
          pattern = java.util.regex.Pattern.compile(prefix.getName() + key + separator.getName() + "(.+)$");
        }
      }
    } else {
      pattern = java.util.regex.Pattern.compile(prefix.getName() + key + "$");
    }

//.... Structures to hold result data

    if (value) {
      values = new java.util.ArrayList<String>();
      if (detail) 
        details = new java.util.ArrayList<String>();
    }
    
  }

/**
 * Getter method for <code>prefix</code> property
 * <p>
 * @return The value for the <code>prefix</code> property
 */

  Options.Prefix getPrefix() {
    return prefix;
  }

/**
 * Getter method for <code>key</code> property
 * <p>
 * @return The value for the <code>key</code> property
 */

  String getKey() {
    return key;
  }

/**
 * Getter method for <code>detail</code> property
 * <p>
 * @return The value for the <code>detail</code> property
 */

  boolean useDetail() {
    return detail;
  }

/**
 * Getter method for <code>separator</code> property
 * <p>
 * @return The value for the <code>separator</code> property
 */

  Options.Separator getSeparator() {
    return separator;
  }

/**
 * Getter method for <code>value</code> property
 * <p>
 * @return The value for the <code>value</code> property
 */

  boolean useValue() {
    return value;
  }

/**
 * Getter method for <code>multiplicity</code> property
 * <p>
 * @return The value for the <code>multiplicity</code> property
 */

  Options.Multiplicity getMultiplicity() {
    return multiplicity;
  }

/**
 * Getter method for <code>pattern</code> property
 * <p>
 * @return The value for the <code>pattern</code> property
 */

  java.util.regex.Pattern getPattern() {
    return pattern;
  }

/**
 * Get the number of results found for this option, which is number of times the key matched
 * <p>
 * @return The number of results
 */

  public int getResultCount() {
    if (value) {
      return values.size();
    } else {
      return counter;
    }
  }

/**
 * Get the value with the given index. The index can range between 0 and {@link #getResultCount()}<code> - 1</code>.
 * However, only for value options, a non-<code>null</code> value will be returned. Non-value options always 
 * return <code>null</code>.
 * <p>
 * @param index The index for the desired value
 * <p>
 * @return The option value with the given index
 * <p>
 * @throws IllegalArgumentException If the value for <code>index</code> is out of bounds
 */

  public String getResultValue(int index) {
    if (!value) return null;
    if (index < 0 || index >= getResultCount()) throw new IllegalArgumentException(CLASS + ": illegal value for index");
    return values.get(index);
  }

/**
 * Get the detail with the given index. The index can range between 0 and {@link #getResultCount()}<code> - 1</code>.
 * However, only for value options which take details, a non-<code>null</code> detail will be returned. Non-value options 
 * and value options which do not take details always return <code>null</code>.
 * <p>
 * @param index The index for the desired value
 * <p>
 * @return The option detail with the given index
 * <p>
 * @throws IllegalArgumentException If the value for <code>index</code> is out of bounds
 */

  public String getResultDetail(int index) {
    if (!detail) return null;
    if (index < 0 || index >= getResultCount()) throw new IllegalArgumentException(CLASS + ": illegal value for index");
    return details.get(index);
  }

/**
 * Store the data for a match found
 */

  void addResult(String valueData, String detailData) {
    if (value) {
      if (valueData == null) throw new IllegalArgumentException(CLASS + ": valueData may not be null");
      values.add(valueData);
      if (detail) {
        if (detailData == null) throw new IllegalArgumentException(CLASS + ": detailData may not be null");
        details.add(detailData);
      }
    } 
    counter++;
  }

/**
 * This is the overloaded {@link Object#toString()} method, and it is provided mainly for debugging 
 * purposes.
 * <p>
 * @return A string representing the instance
 */

  public String toString() {

    StringBuffer sb = new StringBuffer();

    sb.append("Prefix      : ");
    sb.append(prefix);
    sb.append('\n');
    sb.append("Key         : ");
    sb.append(key);
    sb.append('\n');
    sb.append("Detail      : ");
    sb.append(detail);
    sb.append('\n');
    sb.append("Separator   : ");
    sb.append(separator);
    sb.append('\n');
    sb.append("Value       : ");
    sb.append(value);
    sb.append('\n');
    sb.append("Multiplicity: ");
    sb.append(multiplicity);
    sb.append('\n');
    sb.append("Pattern     : ");
    sb.append(pattern);
    sb.append('\n');

    sb.append("Results     : ");
    sb.append(counter);
    sb.append('\n');
    if (value) {
      if (detail) {
        for (int i = 0; i < values.size(); i++) {
          sb.append(details.get(i));
          sb.append(" / ");
          sb.append(values.get(i));
          sb.append('\n');
        }
      } else {
        for (int i = 0; i < values.size(); i++) {
          sb.append(values.get(i));
          sb.append('\n');
        }
      }
    }
    
    return sb.toString();

  }

}