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!7

static double updateInterval = 60;
sbool infoBoxes, fullUpdateAtStart = true;
sbool snippetsDB_inited;
sbool autoDownloadText = true;

concept CSnippet {
  long snippetID;
  S type;
  S title, md5, transpilationMD5;
  
  File file() { ret snippetDB_textFile(snippetID); }
  S text() { ret loadTextFile(file()); }
  bool hasText() { ret fileExists(file()); }
  void setText(S text) { saveTextFile(file(), text); }
}  
  
static Thread downloadThread;

p {
  //restartWith384MBHeap(); // for xfullgrab
  autoRestart10Mins();
  snippetsDB_init();
}

svoid snippetsDB_init() {
  lock programLock();
  if (snippetsDB_inited) ret;
  set snippetsDB_inited;
  mainConcepts.autoSaveInterval = 1000*60; // every minute
  mainConcepts.noXFullGrab = true;
  dbIndexing(CSnippet, 'snippetID);
  botWithCommandList("Snippets.");
  if (fullUpdateAtStart) fullDownload();
  doEvery(0, updateInterval, f update);
}

svoid fullDownload { fullDownload(true); }

svoid fullDownload(bool withText) {
  L<Snippet> l = listAllSnippets();
  printWithTime(n(l, "snippet") + " on server");
  slurp(l);
  if (withText) downloadSomeText();
}

static int slurp(L<Snippet> l) {
  lock dbLock();
  int changedSnippets = 0;
  for (Snippet s : l) {
    CSnippet cs = uniq(CSnippet, snippetID := parseSnippetID(s.id));
    int changes = 0;
    changes += cset(cs, title := s.title, type := s.type);
    if (neq(cs.md5, s.md5)) {
      changes += cset(cs, md5 := s.md5);
      if (cs.hasText()) { cs.setText(null); ++changes; }
    }
    if (changes > 0) ++changedSnippets;
  }
  S text = n2(changedSnippets, "changed snippet");
  
  if (infoBoxes && changedSnippets != 0) infoBox(text);
  printWithTime(text);
  ret changedSnippets;
}

// with text if autoDownloadText is true
svoid update {
  L<Snippet> l = listRecentlyChangedSnippets();
  printWithTime(n(l, "snippet") + " on server");
  int changedSnippets = slurp(l);
  if (changedSnippets >= l(l))
    fullDownload(autoDownloadText);
  else if (autoDownloadText)
    downloadSomeText();
}

answer {
  lock dbLock();
  if "full download" {
    fullDownload();
    ret "OK, have " + n(countConcepts(CSnippet), "snippet");
  }
  
  if "update" {
    update();
    ret "OK";
  }
  
  if "download some text" {
    if (downloadThread != null) ret "Already downloading";
    downloadSomeText();
    ret "Yo";
  }
  
  if "stop downloading" {
    cancelThread(downloadThread);
    downloadThread = null;
    ret "OK";
  }
  
  if "get snippet text *" {
    CSnippet c = findConcept(CSnippet, snippetID := parseSnippetID($1));
    if (c == null) ret "not found";
    downloadText(c);
    ret "OK " + quote(c.text());
  }
  
  if "count" ret n2(countConcepts(CSnippet), "snippet");
  
  if "all snippet ids"
    ret struct(map fsI(sorted(collect(CSnippet, 'snippetID))));

  if "kill" { cleanKillIn1(); ret "OK"; }
}

svoid downloadText(CSnippet s) {
  if (s.hasText()) ret;
  s.setText(eq(s.md5, emptyMD5()) ? "" : loadSnippet(s.snippetID));
}

svoid downloadSomeText {
  lock dbLock();
  if (downloadThread != null) ret;
  downloadThread = startThread(r {
    try {
      int n = 0; for (CSnippet s) if (s.hasText()) ++n;
      printWithTime("Have text for " + n + "/" + n(countConcepts(CSnippet), "concept");
      new ConcurrentEvaluator e;
      e.coresToUse = 10;
      for (final CSnippet s) {
        ping();
        if (!s.hasText()) e.add(r {
          ping();
          downloadText(s);
          /*++n;
          if ((n % 100) == 0)
            printWithTime("Have text for " + n + "/" + n(countConcepts(CSnippet), "concept");*/
        });
      }
      e.startWaitCleanUp();
    } finally {
      downloadThread = null;
    }
  });
}