package morfologik.stemming;

import java.nio.charset.Charset;
import java.util.EnumMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

/**
 * Helper class to build {@link DictionaryMetadata} instances.
 */
public final class DictionaryMetadataBuilder {
  private final EnumMap<DictionaryAttribute, String> attrs
  = new EnumMap<DictionaryAttribute, String>(DictionaryAttribute.class);

  public DictionaryMetadataBuilder separator(char c) {
    this.attrs.put(DictionaryAttribute.SEPARATOR, Character.toString(c));
    return this;
  }

  public DictionaryMetadataBuilder encoding(Charset charset) {
    return encoding(charset.name());
  }

  public DictionaryMetadataBuilder encoding(String charsetName) {
    this.attrs.put(DictionaryAttribute.ENCODING, charsetName);
    return this;
  }

  public DictionaryMetadataBuilder frequencyIncluded()    { return frequencyIncluded(false); }
  public DictionaryMetadataBuilder frequencyIncluded(boolean v)  { this.attrs.put(DictionaryAttribute.FREQUENCY_INCLUDED, Boolean.valueOf(v).toString()); return this; }

  public DictionaryMetadataBuilder ignorePunctuation()    { return ignorePunctuation(true); }
  public DictionaryMetadataBuilder ignorePunctuation(boolean v)  { this.attrs.put(DictionaryAttribute.IGNORE_PUNCTUATION, Boolean.valueOf(v).toString()); return this; }

  public DictionaryMetadataBuilder ignoreNumbers()        { return ignoreNumbers(true); }
  public DictionaryMetadataBuilder ignoreNumbers(boolean v)      { this.attrs.put(DictionaryAttribute.IGNORE_NUMBERS, Boolean.valueOf(v).toString()); return this; }

  public DictionaryMetadataBuilder ignoreCamelCase()      { return ignoreCamelCase(true); }
  public DictionaryMetadataBuilder ignoreCamelCase(boolean v)    { this.attrs.put(DictionaryAttribute.IGNORE_CAMEL_CASE, Boolean.valueOf(v).toString()); return this; }

  public DictionaryMetadataBuilder ignoreAllUppercase()   { return ignoreAllUppercase(true); }
  public DictionaryMetadataBuilder ignoreAllUppercase(boolean v) { this.attrs.put(DictionaryAttribute.IGNORE_ALL_UPPERCASE, Boolean.valueOf(v).toString()); return this; }

  public DictionaryMetadataBuilder ignoreDiacritics()     { return ignoreDiacritics(true); }
  public DictionaryMetadataBuilder ignoreDiacritics(boolean v)   { this.attrs.put(DictionaryAttribute.IGNORE_DIACRITICS, Boolean.valueOf(v).toString()); return this; }

  public DictionaryMetadataBuilder convertCase()          { return convertCase(true); }
  public DictionaryMetadataBuilder convertCase(boolean v)        { this.attrs.put(DictionaryAttribute.CONVERT_CASE, Boolean.valueOf(v).toString()); return this; }

  public DictionaryMetadataBuilder supportRunOnWords()    { return supportRunOnWords(true); }
  public DictionaryMetadataBuilder supportRunOnWords(boolean v)  { this.attrs.put(DictionaryAttribute.RUN_ON_WORDS, Boolean.valueOf(v).toString()); return this; }

  public DictionaryMetadataBuilder encoder(EncoderType type) {
    this.attrs.put(DictionaryAttribute.ENCODER, type.name());
    return this;
  }

  public DictionaryMetadataBuilder locale(Locale locale) {
    return locale(locale.toString());
  }

  public DictionaryMetadataBuilder locale(String localeName) {
    this.attrs.put(DictionaryAttribute.LOCALE, localeName);
    return this;
  }

  public DictionaryMetadataBuilder withReplacementPairs(Map<String, List<String>> replacementPairs) {
    StringBuilder builder = new StringBuilder();
    for (Map.Entry<String,List<String>> e : replacementPairs.entrySet()) {
      String k = e.getKey();
      for (String v : e.getValue()) {
        if (builder.length() > 0) builder.append(", ");
        builder.append(k).append(" ").append(v);
      }
    }
    this.attrs.put(DictionaryAttribute.REPLACEMENT_PAIRS, builder.toString());
    return this;
  }

  public DictionaryMetadataBuilder withEquivalentChars(Map<Character, List<Character>> equivalentChars) {
    StringBuilder builder = new StringBuilder();
    for (Map.Entry<Character,List<Character>> e : equivalentChars.entrySet()) {
      Character k = e.getKey();
      for (Character v : e.getValue()) {
        if (builder.length() > 0) builder.append(", ");
        builder.append(k).append(" ").append(v);
      }
    }
    this.attrs.put(DictionaryAttribute.EQUIVALENT_CHARS, builder.toString());
    return this;
  }

  public DictionaryMetadataBuilder withInputConversionPairs(Map<String, String> conversionPairs) {
    StringBuilder builder = new StringBuilder();
    for (Map.Entry<String,String> e : conversionPairs.entrySet()) {
      String k = e.getKey();
      if (builder.length() > 0) builder.append(", ");
      builder.append(k).append(" ").append(conversionPairs.get(k));
    }
    this.attrs.put(DictionaryAttribute.INPUT_CONVERSION, builder.toString());
    return this;
  }

  public DictionaryMetadataBuilder withOutputConversionPairs(Map<String, String> conversionPairs) {
    StringBuilder builder = new StringBuilder();
    for (Map.Entry<String,String> e : conversionPairs.entrySet()) {
      String k = e.getKey();
      if (builder.length() > 0) builder.append(", ");
      builder.append(k).append(" ").append(conversionPairs.get(k));
    }
    this.attrs.put(DictionaryAttribute.OUTPUT_CONVERSION, builder.toString());
    return this;
  }


  public DictionaryMetadataBuilder author(String author) {
    this.attrs.put(DictionaryAttribute.AUTHOR, author);
    return this;
  }

  public DictionaryMetadataBuilder creationDate(String creationDate) {
    this.attrs.put(DictionaryAttribute.CREATION_DATE, creationDate);
    return this;
  }

  public DictionaryMetadataBuilder license(String license) {
    this.attrs.put(DictionaryAttribute.LICENSE, license);
    return this;
  }

  public DictionaryMetadata build() {
    return new DictionaryMetadata(attrs);
  }

  public EnumMap<DictionaryAttribute, String> toMap()    {
    return new EnumMap<DictionaryAttribute, String>(attrs);
  }
}