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!7

concept DetectorEntry {
  S task; // e.g. "English vs German n=1000"
  S expression; // posNgram|posNgram|...^negNgram|negNgram|...
  S result; // double (0..1)
}

module LanguageDetectionNGramScorers > DynCRUD<DetectorEntry> {
  start {
    indexConceptFieldsCI(DetectorEntry, 'task, DetectorEntry, 'expression);
    crud.sorter = func(Cl<DetectorEntry> l) -> L<DetectorEntry> {
      sortByCalculatedFieldDesc(l, e -> parseDoubleOpt(e.result))
    };
  }
  
  // API
  
  void saveResult(S task, S expression, S result) {
    cset(uniqCI DetectorEntry(+expression, +task), +result);
  }
  
  // pairs of expression + result
  LPairS expressionsForTask(S task) {
    ret map(conceptsWhereCI DetectorEntry(+task),
      e -> pair(e.expression, e.result));
  }
}