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sclass BEACalculations {
  GazelleBEA mod;
  
  *(GazelleBEA *mod) {}
  
  void reactAllInputsWithSomePatterns() {
    for (BEAObject input : mod.beaObjectsOfType("input")) {
      new ReactInputWithSomePatterns r;
      r.input = input;
      r.ccOut = db_mainConcepts();
      r.max = 10;
      r.start();
      stepAllWithTimeout(10.0, r);
    }
  }
  
  class ReactInputWithSomePatterns implements Steppable {
    BEAObject input;
    Concepts ccOut;
    int max = 3, n;
    Iterator<BEAObject> patterns;

    void start {    
      n = countConceptsWhereIC(ccOut, BEAObject, +input, type := "match");
      patterns = iterator(sortByConceptID(conceptsWhereIC BEAObject(type := "Pattern")));
    }
    
    public bool step() {
      if (n >= max) false;
      if (!patterns.hasNext()) false;
      if (reactInputWithPattern(input, patterns.next(), ccOut) != null)
        ++n;
      true;
    }
  }

  SS matchInputWithPattern(BEAObject input, BEAObject pattern) {
    S pat = getString text(pattern);
    S text = getString text(input);
    ret flexMatchAngleBracketVarsIC_honorPunctuation_first(pat, text);
    //ret flexMatchAngleBracketVarsIC_first(pat, text);
  }
  
  BEAObject reactInputWithPattern(BEAObject input, BEAObject pattern, Concepts ccOut) {
    SS mapping = matchInputWithPattern(input, pattern);
    //printVars_str("reactInputWithPattern", +input, +pattern, +mapping);
    if (mapping == null) null;
    ret cnew(ccOut, BEAObject,
      type := "Match",
      +input,
      +pattern,
      +mapping);
  }
  
  O serveAnalyzeInput(GazelleBEA.Req req) {
    new Concepts ccOut;
    BEAObject input = getConcept BEAObject(parseLong(req.get("id")));
    if (input == null)
      input = cnew(ccOut, BEAObject, type := "Input", text := req.get("q"));
    S text = getString text(input);
    new ReactInputWithSomePatterns r;
    r.input = input;
    r.ccOut = ccOut;
    r.max = 1000;
    r.start();
    stepAllWithTimeout(10.0, r);
    L matches = conceptsWhereIC(ccOut, BEAObject, type := "Match");
    ret h1_title("Analyze Input")
      + p("Input: " + b(htmlEncode(text)))
      + p(empty(matches) ? "No matches" : "Matches")
      + ul_htmlEncode(matches);
  }
  
  O serveQueryPage(GazelleBEA.Req req) {
    S q = req.get("q"), algorithm = req.get("algorithm");
    
    Map<S, IF0<Algorithm>> algorithms = litorderedmap(
      "Reverse input (test algorithm)" := (IF0) () -> new ReverseInput,
      "Timeout test" := (IF0) () -> new TimeoutTest,
    );

    S output = empty(algorithm) ? null : doAlgorithm(algorithms, algorithm, q);
    
    ret hcenter3(
        htitle_h2("Gazelle BEA Query")
      + hform(p("Query: " + htextfield(+q, style := "width: 300px; text-align: center") + " &nbsp; Algorithm: " + hselect_list(keys(algorithms), algorithm, name := "algorithm") + " &nbsp; " + hbutton("Go"))))
      + (output == null ? "" : h3("Output by" + algorithm) + output);
  }
  
  S doAlgorithm(Map<S, IF0<Algorithm>> algorithms, S algorithm, S q) {
    StringBufferWithMaxSize out = new(100000);
    
    IF0<Algorithm> algo = mapGet(algorithms, algorithm);
    if (algo == null)
      out.append("Algorithm not found: " + algorithm);
    else {
      if (isB(evalWithTimeout(10.0, r {
        Algorithm alg = algo!;
        alg.q = q;
        alg.out = out;
        alg.run();
      })))
        out.append("\n[algorithm timeout]");
    }
    
    ret str(out);
  }
  
  abstract sclass Algorithm implements Runnable {
    S q;
    Appendable out;
    
    void append(S s) ctex {
      out.append(s);
    }
  }
  
  sclass ReverseInput extends Algorithm {
    run { append(reversed(q)); }
  }
  
  sclass TimeoutTest extends Algorithm {
    run { sleepSeconds(120); }
  }
}