sO thoughtBot;

static int longPollTick = 100;

static int longPollMaxWait = 1000*60;

sS botImageID = #1102802;

sS userImageID = #1102803;

sS chatHeaderImageID = #1102802;

sS baseLink;

sbool botOnRight = true;

sS timeZone = germanTimeZone_string();

static Set<S> specialButtons = litciset("Cancel", "Back", "Abbrechen", "Zurück");

sclass Out extends DynamicObject {

  S buttonsIntro;

  LS buttons;

  S placeholder;

  S defaultInput;

}

sclass Msg extends DynamicObject {

  long time;

  bool fromUser;

  S text;

  Out out;

  *() {}

  *(bool *fromUser, S *text) { time = now(); }

}

concept Conversation {

  bool authed;

  S cookie;

  new LL<Msg> oldDialogs;

  new L<Msg> msgs;

  void add(Msg m) {

    syncAdd(msgs, m);

    change();

  }

  int allCount() { ret lengthLevel2(oldDialogs) + l(msgs); }

  int archiveSize() { ret lengthLevel2(oldDialogs); }

}

svoid pWebChatBot {

  db();

  thoughtBot = runDependent(thoughtBotID);

  Class envType = fieldType(thoughtBot, "env");

  if (envType != null)

    setOpt(thoughtBot, "env", proxy(envType, (O) mc()));

}

static void sayAsync(S session, S text) {

  lock dbLock();

  Conversation conv = getConv(session);

  conv.add(new Msg(false, text));

  print("sayAsync " + session + ", new size=" + conv.allCount());

}

html {

  temp tempRegisterThread();

  S cookie = params.get('cookie);

  if (empty(cookie)) {

    registerVisitor();

    cookie = cookieSent();

  }

  Conversation conv = nempty(cookie) ? getConv(cookie) : null;

  print("URI: " + uri + ", cookie: " + cookie + ", msgs: " + l(conv.msgs));

  S pw = trim(params.get('pw));

  if (nempty(pw)) {

    S realPW = trim(loadSecretTextFile("password.txt"));

    if (empty(realPW)) ret errorMsg("Administrator has not set a password");

    if (neq(pw, realPW))

      ret errorMsg("Bad password, please try again");

    cset(conv, authed := true);

    if (nempty(params.get('redirect)))

      ret hrefresh(params.get('redirect));

  }

  if (eq(uri, "/stats")) {

    if (!conv.authed) ret serveAuthForm(rawLink(uri));

    ret "Threads: " + ul_htmlEncode(getThreadNames(registeredThreads()));

  }

  if (eq(uri, "/logs")) {

    if (!conv.authed) ret serveAuthForm(rawLink(uri));

    ret webChatBotLogsHTML2(rawLink(uri), params);

  }

  if (eq(uri, "/auth-only")) {

    if (eq(params.get('logout), "1"))

      cset(conv, authed := false);

    if (!conv.authed) ret serveAuthForm(params.get('uri));

    ret "";

  }

  {

    lock dbLock();

    S message = trim(params.get("btn"));

    if (empty(message)) message = trim(params.get("message"));

    if (match("new dialog", message)) {

      conv.oldDialogs.add(conv.msgs);

      cset(conv, msgs := new L);

      conv.change();

      callOpt(thoughtBot, "clearSession", conv.cookie);

      message = null;

    }

    call(thoughtBot, "setSession", cookie, params);

    if (empty(conv.msgs))

      addReplyToConvo(conv, lambda0 initialMessage);

    if (nempty(message) && !lastUserMessageWas(conv, message)) {

      print("Adding message: " + message);

      conv.add(new Msg(true, message));

    }

    if (nempty(conv.msgs) && last(conv.msgs).fromUser)

      addReplyToConvo(conv, () -> makeReply(last(conv.msgs).text));

  } // locked

  if (eq(uri, "/msg")) ret withHeader("OK");

  if (eq(uri, "/incremental")) {

    int a = parseInt(params.get("a"));

    long start = sysNow();

    L msgs;

    bool first = true;

    while (licensed() && sysNow() < start+longPollMaxWait) {

      int as = conv.archiveSize();

      msgs = cloneSubList(conv.msgs, a-as);

      bool newDialog = a <= as;

      if (empty(msgs)) {

        if (first) {

          print("Long poll starting on " + cookie + ", " + a + "/" + a);

          first = false;

        }

        sleep(longPollTick);

      } else {

        if (first) print("Long poll ended.");

        new StringBuilder buf;

        renderMessages(buf, msgs);

        ret withHeader("<!-- " + conv.allCount() + " " + (newDialog ? "NEW DIALOG " : "") + "-->\n"  + buf);

      }

    }

    ret withHeader("");

  }

  {

    lock dbLock();

    processParams(params);

    S html = loadSnippet(templateID); // TODO: cache

    new StringBuilder buf;

    // incremental only    

    //renderMessages(buf, conv.msgs);

    S langlinks = "<!-- langlinks here -->";

    if (html.contains(langlinks))

      html = html.replace(langlinks,

        ahref(rawLink("eng"), "English") + " | " + ahref(rawLink("deu"), "German"));

    html = html.replace("#BOTIMG#", imageSnippetURLOrEmptyGIF(chatHeaderImageID));

    html = html.replace("#N#", "0" /*str(conv.allCount())*/);

    html = html.replace("#INCREMENTALURL#", baseLink + "/incremental?a=");

    html = html.replace("#MSGURL#", baseLink + "/msg?message=");

    if (nempty(params.get("debug")))

      html = html.replace("var showActions = false;", "var showActions = true;");

    html = html.replace("#AUTOOPEN#", jsBool(botAutoOpen());

    html = html.replace("#BOT_ON#", jsBool(botOn());

    html = html.replace("$HEADING", heading);

    html = html.replace("<!-- MSGS HERE -->", str(buf));

    html = hreplaceTitle(html, heading);

    if (eqGet(params, "_botDemo", "1"))

      ret hhtml(hhead(

        htitle("Bot Demo")

        + loadJQuery()

      ) + hbody(hjavascript(html)));

    else

      ret withHeader(subBot_serveJavaScript(html));

  }

}

svoid addReplyToConvo(Conversation conv, IF0<S> think) {

  S reply = "";

  Out out = null;

  pcall {

    reply = think!;

    out = (Out) quickImport(getThreadLocal(thoughtBot, "out"));

  }

  Msg msg = new Msg(false, reply);

  msg.out = out;

  conv.add(msg);

}

sO withHeader(S html) {

  ret withHeader(subBot_serveHTML(html));

}

sO withHeader(O response) {

  call(response, 'addHeader, "Access-Control-Allow-Origin", "*");

  ret response;

}

svoid renderMessages(StringBuilder buf, L<Msg> msgs) {

  new Set<S> buttonsToSkip;

  new LS buttonsHtml;

  for (Msg m : msgs) {

    if (!m.fromUser && eq(m.text, "-")) continue;

    S html = htmlEncode2_nlToBr(trim(m.text));

    // pull back & cancel buttons to beginning of msg

    if (m == last(msgs) && m.out != null) {

      fOr (S btn : m.out.buttons)

        if (specialButtons.contains(btn)) {

          buttonsToSkip.add(btn);

          buttonsHtml.add(renderButtons(ll(btn)));

        }

    }

    if (nempty(buttonsHtml) && l(m.out.buttons) == l(buttonsToSkip))

      html += " " + hspan("  ", class := "chat-button-span") + lines(buttonsHtml);

    else

      buttonsToSkip.clear();

    appendMsg(buf, m.fromUser ? defaultUserName() : botName, formatTime(m.time), html, !m.fromUser);

  }

  appendButtons(buf, last(msgs).out, buttonsToSkip);

}

svoid appendMsg(StringBuilder buf, S name, S time, S text, bool bot) {

  // img now before text because of position: absolute

  // removed from last div: <span class="direct-chat-timestamp pull-$LR">$TIME</span>

  buf.append(([[<div class="direct-chat-msg doted-border">]]);

  S imgID = bot ? botImageID : userImageID;

  if (nempty(imgID))

    buf.append([[<img alt="message user image" src="$IMG" class="direct-chat-img">]]

      .replace("$IMG", snippetImgLink(imgID)));

  buf.append([[

    <div class="direct-chat-info clearfix">

    <div style="float: right" class="direct-chat-timestamp">$TIME</div>

    <span class="direct-chat-name pull-left">$NAME</span>

    </div>

    <div class="direct-chat-text pull-$LR clearfix">

      $TEXT

    </div>

    <div class="direct-chat-info clearfix"></div>

  </div>

   ]].replace("$LR", bot != botOnRight ? "left" : "right")

     .replace("$NAME", name)

     .replace("$TIME", time)

     .replace("$TEXT", text));

}

sS replaceButtonText(S s) {

  if (eqicOneOf(s, "back", "zurück")) ret unicode_undoArrow();

  if (eqicOneOf(s, "cancel", "Abbrechen")) ret unicode_crossProduct();

  ret s;

}

sS renderButtons(LS buttons) {

  new LS out;

  for i over buttons: {

    S code = buttons.get(i);

    S text = replaceButtonText(code);

    out.add(hbuttonOnClick_returnFalse(text, "submitAMsg(" + jsQuote(text) + ")", class := "chatbot-choice-button", title := eq(code, text) ? null : code));

    if (!specialButtons.contains(code)

      && i+1 < l(buttons) && specialButtons.contains(buttons.get(i+1)))

      out.add("  ");

  }

  ret lines(out);

}

svoid appendButtons(StringBuilder buf, Out out, Set<S> buttonsToSkip) {

  S placeholder = out == null ? "" : unnull(out.placeholder);

  S defaultInput = out == null ? "" : unnull(out.defaultInput);

  buf.append(hscript("chatBot_setInput(" + jsQuote(defaultInput) + ", " + jsQuote(placeholder) + ");"));

  if (out == null) ret;

  LS buttons = listMinusSet(out.buttons, buttonsToSkip);

  if (empty(buttons)) ret;

  S buttonsHtml = renderButtons(buttons);

  buf.append([[<div class="direct-chat-msg doted-border">

    <div class="direct-chat-buttons">

      $BUTTONS

    </div>

  </div>

    ]].replace("$BUTTONS", htmlEncode2_nlToBr(appendNewLineIfNempty(trim(out.buttonsIntro))) + buttonsHtml));

}

svoid appendDate(StringBuilder buf, S date) {

  buf.append([[

  <div class="chat-box-single-line">

    <abbr class="timestamp">DATE</abbr>

  </div>]].replace("DATE", date));

}

sS initialMessage() {

  ret (S) call(thoughtBot, "initialMessage"); 

}

static bool lastUserMessageWas(Conversation conv, S message) {

  Msg m = last(conv.msgs);

  ret m != null && m.fromUser && eq(m.text, message);

}

sS makeReply(S message) {

  ret callStaticAnswerMethod(thoughtBot, message);

}

sS formatTime(long time) {

  ret timeInTimeZoneWithOptionalDate_24(timeZone, time);

}

sS formatDialog(S id, L<Msg> msgs) {

  new L<S> lc;

  for (Msg m : msgs)

    lc.add(htmlencode((m.fromUser ? "> " : "< ") + m.text));

  ret id + ul(lc);

}

static Conversation getConv(fS cookie) {

  ret withDBLock(func -> Conversation {

    uniq(Conversation, +cookie)

  });

}

sS serveAuthForm(S redirect) {

  ret hhtml(hhead(htitle("Authorization required")) + hbody(hfullcenter(

    h3_htmlEncode(heading + " Admin")

    + hpostform(

      hhidden(+redirect)

    + "Password: " + hpassword('pw) + "<br><br>" + hsubmit()))));

}

sS errorMsg(S msg) {

  ret hhtml(hhead_title("Error") + hbody(hfullcenter(msg + "<br><br>" + ahref(jsBackLink(), "Back"))));

}

sS defaultUserName() {

  ret de() ? "Sie" : "You";

}

sbool de() {

  ret isTrue(callOpt(thoughtBot, "de"));

}

sbool botOn() {

  ret isTrue(callOpt(thoughtBot, "botOn"));

}

sbool botAutoOpen() {

  ret !isFalse(callOpt(thoughtBot, "botAutoOpen"));

}