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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 text = getString text(input);
    ret matchInputWithPattern(text, pattern);
  }
    
  SS matchInputWithPattern(S text, BEAObject pattern) {
    S pat = getString text(pattern);

    if (pattern.typeIs("Syntactic Pattern"))
      pat = starsToAngleBracketedNumbers(pat);
      
    SS mapping = flexMatchAngleBracketVarsIC_honorPunctuation_first(pat, text);
    if (mapping != null) ret mapping;
    ret flexMatchAngleBracketVarsIC_first(pat, text);
  }
  
  BEAObject reactInputWithPattern(BEAObject input, BEAObject pattern, Concepts ccOut default db_mainConcepts()) {
    if (input == null || pattern == null) null;
    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");
    bool dontRun = eq(req.get("dontRun"), "1");
    
    Map<S, IF0<Algorithm>> algorithms = litorderedmap(
      "Process new input" := (IF0) () -> new ProcessNewInput,
      "Run pattern" := (IF0) () -> new RunPattern,
      "Find rewrites for match" := (IF0) () -> new FindRewrites,
      "Reverse input (test algorithm)" := (IF0) () -> new ReverseInput,
      "Timeout test" := (IF0) () -> new TimeoutTest,
      "Make syntactic patterns" := (IF0) () -> new MakeSyntacticPatterns,
      
      // add algorithms here
    
    );

    S output = empty(algorithm) || dontRun ? null : doAlgorithm(algorithms, algorithm, q);
    
    S right = mod.html_loggedIn();
    
    S centered = new(
      htitle_h2(ahref(mod.baseLink + "/", "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"))),
    );
    
    ret hmobilefix() + hsansserif() + 
      loadJQuery2() + 
        div_alignRight(right)
      + div_center(centered)
      + (output == null ? "" : h3(algorithm) + output);
  }
  
  S doAlgorithm(Map<S, IF0<Algorithm>> algorithms, S algorithm, S q) {
    GazelleBEA.Req req = mod.currentReq!;
    StringBufferWithMaxSize out = new(100000);
    
    IF0<Algorithm> algo = lookupPossiblyCI(algorithms, algorithm);
    if (algo == null)
      out.append("Algorithm not found: " + algorithm);
    else {
      if (isB(evalWithTimeout(10.0, r {
        temp tempSetTL(mod.currentReq, req);
        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;
    Appendable outPrio = new StringBufferWithMaxSize(10000);
    
    void appendHTML(Appendable out default this.out, S html) ctex {
      if (empty(html)) ret;
      out.append(html).append("\n");
    }
    
    void appendText(Appendable out default this.out, S text) ctex {
      if (empty(text)) ret;
      out.append(hpre_htmlencode(rtrim(text)));
    }
    
    void appendTextBold(Appendable out default this.out, S text) ctex {
      if (empty(text)) ret;
      out.append(b(hpre_htmlencode(rtrim(text))));
    }
  }
  
  runnable class ReverseInput extends Algorithm {
    appendText(reversed(q));
  }
  
  class TimeoutTest extends Algorithm {
    run { sleepSeconds(120); }
  }
  
  class RunPattern extends Algorithm {
    new L<Runnable> nonMatches;
    
    run {
      BEAObject pattern = mod.beaGet(parseFirstLong(q));
      if (pattern == null) ret with appendText("Pattern not found");
      appendText("Pattern: " + pattern);
      for (BEAObject input : mod.beaList("Input")) {
        S text = input.text();
        SS mapping = matchInputWithPattern(input, pattern);
        if (mapping == null)
          nonMatches.add(r {
            appendText("Checking Input: " + input + " - No match");
          });
        else {
          S result = "\n" + indent(formatDoubleArrowMap_horizontallyAligned(mapping));
          appendText("Checking Input: " + input + result);
          allowStoringMatch(this, input, pattern, mapping);
        }
      }
      
      callFAll(nonMatches);
    }
  }

  class FindRewrites extends Algorithm {
    run {
      // argument is ID of a match
      BEAObject match = mod.beaGet(parseFirstLong(q));
      if (match == null || !match.typeIs("Match")) ret with appendText("Match not found");
      BEAObject pattern = cast cget pattern(match);
      BEAObject input = cast cget input(match);
      SS mapping = cast get mapping(match);
      appendText("Match: " + match);
      appendText("Input: " + input);
      appendText("Pattern: " + pattern);
      appendText("Mapping:\n"
        + indent(formatDoubleArrowMap_horizontallyAligned(mapping)));
        
      appendRewrites(this, input, input.text(), pattern, match, mapping);
    }
  }
  
  // match and input can be null, pattern has to be set
  void appendRewrites(Algorithm algo, BEAObject input, S inputText, BEAObject pattern, BEAObject match, SS mapping) {
    Cl<BEAObject> rewrites = mod.findBEABackRefs(pattern, "Rewrite");
    for (BEAObject r : rewrites) {
      S text = r.text();
      S text2 = replaceAngleBracketVars(text, mapValues curly(mapping));
      algo.appendText(" Using pattern rewrite: " + text);
      algo.appendTextBold(
          "    " + inputText + "\n"
        + " => " + text2);
        
      // look for existing rewrite
      BEAObject existing = match == null || input == null ?: conceptWhereIC BEAObject(
        type := "Rewrite", +input, text := text2,
          +match, patternRewrite := r, label := "good"
      );
      
      if (existing != null)
        algo.appendHTML("Rewrite exists: " + mod.beaLinkHTML(existing));
      else if (match != null && input != null)
        algo.appendHTML(
          hinlinepostform(
            hhiddenMulti(
              action := "create",
              f_type := "Rewrite",
              f_text := text2,
              f_input := input.id, metaInfo_input := "concept",
              f_match := match.id, metaInfo_match := "concept",
              f_patternRewrite := r.id, metaInfo_patternRewrite := "concept",
              f_label := "good")
            + hbutton("Good rewrite"),
            target := "_blank",
            action := mod.crudLink(BEAObject)));
    }
  }
  
  class ProcessNewInput extends Algorithm {
    new L<Runnable> nonMatches;
    
    run {
      q = trim(q);
      BEAObject input = handleInput(this, q);

      for (BEAObject pattern : mod.beaListAny("Pattern", "Syntactic Pattern")) {
        SS mapping = matchInputWithPattern(q, pattern);
        if (mapping == null)
          nonMatches.add(r {
            appendText("Checking Pattern: " + pattern + " - No match");
          });
        else {
          S result = "\n" + indent(formatDoubleArrowMap_horizontallyAligned(mapping));
          appendText("Checking Pattern: " + pattern + result);
          if (input == null) {
            //appendHTML("Click \"Save input\" first to store this match");
          } else
            allowStoringMatch(this, input, pattern, mapping);
            
          appendRewrites(this, input, q, pattern, null, mapping);
        }
      }
      
      callFAll(nonMatches);
    }
  }
  
  void allowStoringMatch(Algorithm algo, BEAObject input, BEAObject pattern, SS mapping) {
    BEAObject match = conceptWhereCI(BEAObject, type := "Match",
      +pattern, +input, +mapping);
    if (match != null)
      ret with algo.appendHTML("Match exists: " + mod.beaLinkHTML(match));
      
    S url = appendParamsToURL(mod.baseLink + "/storeMatch", pattern := pattern.id, input := input.id);
    algo.appendHTML(
      hbuttonLink(appendParamsToURL(url, label := "good"), "Good match") + " "
      + hbuttonLink(appendParamsToURL(url, label := "bad"), "Bad match"));
  }
  
  runnable class MakeSyntacticPatterns extends Algorithm {
    for (BEAObject p : mod.beaList("Pattern")) {
      appendText(p + " => " + makeSyntacticPattern(p));
    }
  }

  S syntacticPatternText(BEAObject p) {  
    ret simpleSpacesTrim_javaTok(angleBracketVarsToStars(p.text()));
  }
  
  BEAObject makeSyntacticPattern(BEAObject p) {
    if (p == null || !p.typeIs("Pattern") || empty(p.text())) null;
    print("makeSyntacticPattern", p);
    S text = syntacticPatternText(p);
    BEAObject sp = uniqCI BEAObject(type := "Syntactic Pattern", +text);
    cset(p, syntacticPattern := sp);
    ret sp;
  }
  
  BEAObject handleInput(Algorithm algo, S q) {
    algo.appendText("Input: " + q);
      
    BEAObject input = conceptWhereIC(BEAObject, type := "Input", text := q);

    algo.appendHTML(input != null
      ? "Input exists: " + mod.beaLinkHTML(input)
      : !mod.requestAuthed() && !mod.allowAnonymousInputUpload ? null : hinlinepostform(
          /*hhiddenMulti(
              action := "create",
              f_type := "Input",
              f_text := q)
            + hbutton("Save input"),
            target := "_blank",
            action := mod.crudLink(BEAObject))*/
            hhiddenMulti(
              text := q,
              redirect := "")
            + hbutton("Save input"),
            action := mod.baseLink + "/saveInput",
            onsubmit := "$('input[name=redirect]').val(window.location.toString());"));
    ret input;
  }
  
} // end of Calculations