!7

sbool bottomRight = false;
sS templateID = bottomRight ? #1008787 : /*#1009000*/#1009081;
sS heading = "Stefan's Chat";
sS roomName = "main"; // internal
static int maxMessages = 100;

static int longPollTick = 100;
static int longPollMaxWait = 1000*60;

static new L pagePostProcessors;

concept Extension {
  S code;
  double priority;
}

concept User {
  S ipAddress;
}

sclass Msg {
  long time;
  User user;
  S text;
  L<S> buttons;
  
  *() {}
  *(S ipAddress, S *text) {
    user = uniq_sync(User, +ipAddress);
    time = now();
  }
}

concept Conversation {
  S cookie;
  
  // TODO: use synchro lists
  new LL<Msg> oldDialogs;
  new L<Msg> msgs;

  void add(Msg m) {
    if (empty(oldDialogs)) oldDialogs.add(new L);
    if (l(msgs) >= maxMessages)
      last(oldDialogs).add(popFirst(msgs));
    msgs.add(m);
    change();
  }
  
  int allCount() { ret lengthLevel2(oldDialogs) + l(msgs); }
  int archiveSize() { ret lengthLevel2(oldDialogs); }
}

p {
  db();
  for (Extension e : sortByField('priority, list(Extension)))
    pcall { evalJava(e.code); }
}

synchronized static void sayAsync(S session, S user, S text) {
  Conversation conv = getConv(session);
  conv.add(new Msg(user, text));
  print("sayAsync " + session + ", new size=" + conv.allCount());
}

html {
 _registerThread();
 registerVisitor();
 //fS cookie = cookieSent();
 try {
  Conversation conv;
  synchronized(mc()) {
    if (eq(uri, "/stats"))
      ret "Threads: " + ul_htmlEncode(getThreadNames(registeredThreads()));
      
    if (eq(uri, "/logs"))
      ret withDBLock(func -> S {
        L<Msg> msgs = sortByFieldDesc(allMsgs(), 'time);
        new L<S> l;
        for (Msg m : msgs)
          l.add(formatMsgForLog(m) + "<br>");
        ret h3_htitle("Chat Logs") + p(join(l));
      });
    
    S message = trim(params.get("btn"));
    if (empty(message)) message = trim(params.get("message"));
    conv = getConv(roomName);
    print("Have " + l(conv.msgs) + " msgs in conversation " + conv.cookie);
    
    if (match("clear", message)) {
      print("Clearing.");
      conv.oldDialogs.add(conv.msgs);
      cset(conv, msgs := new L);
      conv.change();
      message = null;
    }
    
    if (nempty(message) /*&& !lastUserMessageWas(conv, message)*/) {
      conv.add(new Msg(clientIP(), message));
      print("Have " + l(conv.msgs) + " msgs in conversation " + conv.cookie + " after add");
    }
  } // synchronized
  
  if (eq(uri, "/msg")) ret "OK";
  
  if (eq(uri, "/incremental")) {
    int a = parseInt(params.get("a"));

    long start = sysNow();
    L msgs;
    bool first = true;
    while (licensed() && sysNow() < start+longPollMaxWait) {
      msgs = subList(conv.msgs, a-conv.archiveSize());
      if (empty(msgs)) {
        if (first) {
          print("Long poll starting on " + roomName + ", " + a);
          first = false;
        }
        sleep(longPollTick);
      } else {
        if (first) print("Long poll ended.");
        new StringBuilder buf;
        renderMessages(buf, msgs);
        ret "<!-- " + conv.allCount() + "-->\n"  + buf;
      }
    }
    ret "";
  }
  
  synchronized(mc()) {
    S html = loadSnippet(templateID); // TODO: cache
    new StringBuilder buf;
    
    renderMessages(buf, conv.msgs);
  
    html = html.replace("#N#", str(conv.allCount()));
    html = html.replace("#INCREMENTALURL#", rawBotLink(programID(), "incremental?a=");
    html = html.replace("#MSGURL#", rawBotLink(programID(), "msg?message="));
  
    html = html.replace("$HEADING", heading);
    html = html.replace("<!-- MSGS HERE -->", str(buf));
    html = hreplaceTitle(html, heading);
    html = hmobilefix(html);
    for (O f : pagePostProcessors) pcall { html = or((S) callF(f, html), html); }
    ret html;
  }
 } finally {
  _unregisterThread();
 }
}

svoid renderMessages(StringBuilder buf, L<Msg> msgs) {
  for (Msg m : msgs) {
    new Matches mm;
    S html;
    if (startsWith(m.text, "[IMAGE] ", mm)) {
      S url = trim(mm.get(0));
      html = targetBlank(url, himg(url, width := 200, title := "User-submitted image", style := "display: block; margin-left: auto; margin-right: auto"));
    } else {
      dynamize_linkParams.set(new O[] { target := "_blank" });
      html = dynamize(m.text);
    }
    appendMsg(buf, m.user == null ? "?" : m.user.ipAddress, formatTime(m.time), html, /*!m.fromUser*/false);
  }
      
  if (empty(msgs)) ret;
  L<S> buttons = last(msgs).buttons;
  if (nempty(buttons))
    appendButtons(buf, buttons);
}

svoid appendMsg(StringBuilder buf, S name, S time, S text, bool bot) {
  S imgLink = snippetImgLink(bot ? #1008323 : #1008359);
	buf.append([[<div class="direct-chat-msg doted-border">
    <div class="direct-chat-info clearfix">
    <span class="direct-chat-name pull-left">$NAME</span>
    </div>
    <img alt="message user image" src="$IMG" class="direct-chat-img">
    <div class="direct-chat-text">
      $TEXT
    </div>
    <div class="direct-chat-info clearfix">
      <span class="direct-chat-timestamp pull-right">$TIME</span>
    </div>
  </div>
    ]].replace("$IMG", imgLink)
      .replace("$NAME", name)
      .replace("$TIME", time)
      .replace("$TEXT", text));
}

svoid appendButtons(StringBuilder buf, L<S> buttons) {
  S buttonsHtml = lines(map(buttons, func(S text) {
    hsubmit(text, name := "btn")
  }));
	buf.append([[<div class="direct-chat-msg doted-border">
    <div class="direct-chat-buttons">
      $BUTTONS
    </div>
  </div>
    ]].replace("$BUTTONS", 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 formatTime(long time) {
  ret formatGMTWithOptionalDate_24(time);
}

sS formatMsgForLog(Msg m) {
  ret htmlencode(formatDateAndTime(m.time)) + " - " + htmlencode(m.user.ipAddress + ": " + m.text);
}

static Conversation getConv(fS cookie) {
  ret uniq_sync(Conversation, +cookie);
}

static L<Msg> allMsgs() {
  new L<Msg> l;
  for (Conversation c)
    l.addAll(c.msgs);
  ret l;
}