!7

set flag DynModule.

cmodule DiscordBot > DynPrintLogAndEnabled {
  transient JDA bot;
  transient new Set<Long> msgsReactedTo;
  transient double deleteDelay = 60.0;
  transient Color imageEmbedMysteriousLineColor = colorFromHex("36393f");
  
  transient new InheritableThreadLocal<MessageChannel> currentChannel;

  start {
    logModuleOutput();
    // TODO: log JDA output
    bot = discordBot(new ListenerAdapter {
      public void onMessageReceived(MessageReceivedEvent e) pcall {
        ret if !enabled || !licensed();
        
        bool bot = e.getAuthor().isBot();
        
        Message msg = e.getMessage();
        
        print("Channel type: " + e.getChannelType());
        bool isPrivate = e.getChannelType() == ChannelType.PRIVATE;
        print("Msg from " + e.getAuthor().getName() + ": " + e.getMessage().getContentDisplay());
        S content = trim(msg.getContentRaw());
        if (empty(content)) ret;

        O user = userConcept(e.getAuthor());
        
        S crud = dm_gazelle_linesCRUD();
        O channel = dm_call(crud, 'uniqChannel, msg.getChannel().getIdLong());
        dm_call(crud, 'cset, channel, litobjectarray(name := msg.getChannel().getName()));
        
        O lineConcept = dm_call(crud, 'uniqConcept, litObjectArrayAsObject(msgID := e.getMessage().getIdLong()));
        dm_call(crud, 'cset, lineConcept, litobjectarray(
          text := content,
          +bot, +isPrivate,
          author := user, +channel));
        
        ret if bot;
        
        final MessageChannel ch = e.getChannel();
        
        if (swicOneOf(content, "!eval ", "!fresh ", "!real-eval", "!safe-eval ") || eqic(content, "!fresh")) {
          O safetyCheck = null;
          bool authed = dm_discord_userCanEval(e.getAuthor().getIdLong());
          new Matches m;
          if (swic(content, "!safe-eval ", m)) {
            content = "!eval " + m.rest();
            authed = false;
          }
          
          if (!authed) {
            //ret with postInChannel(ch, "Sorry, you're not authed to eval");
            safetyCheck = func(S code) -> S {
              S safety = joinWithComma(getCodeFragmentSafety(code));
              if (eq(safety, 'safe)) ret "";
              S s = "Sorry. Safety level is " + safety;
              Set<S> unknown = codeAnalysis_getUnknownIdentifiers(code);
              if (nempty(unknown)) s += ". Unknown identifiers: " + joinWithComma(unknown);
              ret s;
            };
          }
          temp tempSetTL(currentChannel, ch);
          ret with dm_bot_execEvalCmd(voidfunc(S s) {
            if (s != null)
              postInChannel(ch, shorten(s, 1000))
          }, content, +safetyCheck);
        }
        
        GazelleEvalContext ctx = dm_gazelle_stdEvalContext(dm_gazelle_allRulesWithComment("discord"));
        GazelleTree tree = new(ctx, content);
        L<GazelleTree> l = dm_gazelle_getChildren(tree);
        if (empty(l)) ret;
        
        for (GazelleTree t : takeFirst(10, l))
          postInChannelWithDelete(ch, t.line);
      }
      
      public void onMessageReactionAdd(MessageReactionAddEvent e) pcall {
        ret if !enabled || !licensed();
        MessageReaction r = e.getReaction();
        bool bot = e.getUser().isBot();
        long msgID = r.getMessageIdLong();
        add(msgsReactedTo, msgID);
        print("User " + e.getUser() + (bot ? " (bot)" : "") + " reacted to message " + msgID + " with " + r.getReactionEmote());
        if (bot) ret;

        S crud = dm_gazelle_linesCRUD();
        O lineConcept = dm_call(crud, 'uniqConcept, litObjectArrayAsObject(+msgID));
        L reactions = cast get(lineConcept, 'reactions);
        print("lineConcept=" + lineConcept);
        print("reactions=" + reactions);
        O reaction = dm_call(crud, 'nuReaction, litObjectArrayAsObject(
          user := userConcept(e.getUser()),
          emoji := r.getReactionEmote().getName(),
          created := now()));
        print("reaction=" + reaction);
          
        dm_call(crud, 'cset, lineConcept, litobjectarray(
          reactions := listPlus(reactions, reaction)));
      }
    });
    
    dm_registerAs('discordBot);
    print("Started bot");
  }
  
  void cleanMeUp {
    if (bot != null) pcall {
      print("Shutting down bot");
      bot.shutdown();
      print("Bot shut down");
    }
    bot = null;
  }
  
  O userConcept(User user) {
    S crud = dm_gazelle_linesCRUD();
    O userConcept = dm_call(crud, 'uniqUser, user.getIdLong());
    dm_call(crud, 'cset, userConcept, litobjectarray(name := user.getName()));
    ret userConcept;
  }
  
  // API
  
  void postInChannel(long channelID, S msg) {
    postInChannel(bot.getTextChannelById(channelID), msg);
  }
  
  void postInChannel(MessageChannel channel, S msg) {
    channel.sendMessage(msg).queue();
  }
  
  void postInChannel(S channel, S msg) {
    long id = dm_discord_channelID(channel);
    if (id == 0) fail("Channel not found: " + channel);
    postInChannel(id, msg);
  }
  
  void postInChannelWithDelete(MessageChannel channel, S msg) {
    channel.sendMessage(msg).queue(msg2 -> {
      final long msgId = msg2.getIdLong();
      print("I sent msg: " + msgId);
      doLater(deleteDelay, r {
        ret if contains(msgsReactedTo, msgId);
        print("Deleting msg " + msgId);
        msg2.delete().queue();
      });
    });
  }
  
  void postImage(S url) {
    postImage(currentChannel!, url);
  }
  
  void postImage(S url, S title) {
    postImage(currentChannel!, url, title);
  }
  
  void postImage(MessageChannel channel, S url) {
    postImage(channel, url, "");
  }
  
  void postImage(MessageChannel channel, S url, S description) {
    channel.sendMessage(
      new EmbedBuilder()
        .setImage(absoluteURL(url))
        //.setTitle(unnull(title))
        .setDescription(unnull(description))
        .setColor(imageEmbedMysteriousLineColor)
        .build()).queue();
  }
}

Began life as a copy of #1021630