Transfer Feature reopen

application/src/main/java/org/togetherjava/tjbot/features/Features.java

@@ -126,6 +126,7 @@ public static Collection<Feature> createFeatures(JDA jda, Database database, Con
         features.add(new HelpThreadCreatedListener(helpSystemHelper));
 
         // Message context commands
+        features.add(new TransferQuestionCommand(config));
 
         // User context commands
 

application/src/main/java/org/togetherjava/tjbot/features/moderation/TransferQuestionCommand.java

@@ -0,0 +1,220 @@
+package org.togetherjava.tjbot.features.moderation;
+
+import net.dv8tion.jda.api.EmbedBuilder;
+import net.dv8tion.jda.api.JDA;
+import net.dv8tion.jda.api.entities.Guild;
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.entities.MessageEmbed;
+import net.dv8tion.jda.api.entities.User;
+import net.dv8tion.jda.api.entities.channel.concrete.ForumChannel;
+import net.dv8tion.jda.api.entities.channel.forums.ForumTag;
+import net.dv8tion.jda.api.entities.channel.forums.ForumTagSnowflake;
+import net.dv8tion.jda.api.entities.channel.unions.MessageChannelUnion;
+import net.dv8tion.jda.api.events.interaction.ModalInteractionEvent;
+import net.dv8tion.jda.api.events.interaction.command.MessageContextInteractionEvent;
+import net.dv8tion.jda.api.interactions.commands.build.Commands;
+import net.dv8tion.jda.api.interactions.components.Modal;
+import net.dv8tion.jda.api.interactions.components.text.TextInput;
+import net.dv8tion.jda.api.interactions.components.text.TextInputStyle;
+import net.dv8tion.jda.api.requests.RestAction;
+import net.dv8tion.jda.api.utils.messages.MessageCreateBuilder;
+import net.dv8tion.jda.api.utils.messages.MessageCreateData;
+
+import org.togetherjava.tjbot.config.Config;
+import org.togetherjava.tjbot.features.BotCommandAdapter;
+import org.togetherjava.tjbot.features.CommandVisibility;
+import org.togetherjava.tjbot.features.MessageContextCommand;
+import org.togetherjava.tjbot.features.utils.StringDistances;
+
+import java.awt.Color;
+import java.util.List;
+import java.util.Optional;
+import java.util.function.Predicate;
+import java.util.function.Supplier;
+import java.util.regex.Pattern;
+
+public final class TransferQuestionCommand extends BotCommandAdapter
+        implements MessageContextCommand {
+    private static final String COMMAND_NAME = "transfer-question";
+    private static final String MODAL_TITLE_ID = "transferID";
+    private static final String MODAL_INPUT_ID = "transferQuestion";
+    private static final String MODAL_TAG = "tags";
+    private static final int TITLE_GUESS_MAX_LENGTH = 50;
+    private static final Pattern TITLE_GUESS_COMPACT_REMOVAL_PATTERN = Pattern.compile("\\W");
+    private static final int TITLE_GUESS_COMPACT_LENGTH_MIN = 2;
+    private static final int TITLE_GUESS_COMPACT_LENGTH_MAX = 30;
+    private static final Color EMBED_COLOR = new Color(50, 164, 168);
+    private final Predicate<String> isHelpForumName;
+    private final List<String> tags;
+
+
+    /**
+     * Creates a new instance.
+     *
+     * @param config to get the helper forum and tags
+     */
+    public TransferQuestionCommand(Config config) {
+        super(Commands.message(COMMAND_NAME), CommandVisibility.GUILD);
+
+        isHelpForumName =
+                Pattern.compile(config.getHelpSystem().getHelpForumPattern()).asMatchPredicate();
+
+        tags = config.getHelpSystem().getCategories();
+    }
+
+    @Override
+    public void onMessageContext(MessageContextInteractionEvent event) {
+        String originalMessage = event.getTarget().getContentRaw();
+        String originalMessageId = event.getTarget().getId();
+        String originalChannelId = event.getChannel().getId();
+        String authorId = event.getTarget().getAuthor().getId();
+        String mostCommonTag = tags.get(0);
+
+        TextInput modalTitle = TextInput.create(MODAL_TITLE_ID, "Title", TextInputStyle.SHORT)
+            .setMaxLength(70)
+            .setMinLength(4)
+            .setPlaceholder("Describe the question in short")
+            .setValue(createTitle(originalMessage))
+            .build();
+
+        TextInput modalInput =
+                TextInput.create(MODAL_INPUT_ID, "Question", TextInputStyle.PARAGRAPH)
+                    .setValue(originalMessage)
+                    .setRequiredRange(3, 2000)
+                    .setPlaceholder("Contents of the question")
+                    .build();
+
+        TextInput modalTag = TextInput.create(MODAL_TAG, "Most fitting tag", TextInputStyle.SHORT)
+            .setValue(mostCommonTag)
+            .setPlaceholder("Suitable tag for the question")
+            .build();
+
+        String modalComponentId =
+                generateComponentId(authorId, originalMessageId, originalChannelId);
+        Modal transferModal = Modal.create(modalComponentId, "Transfer this question")
+            .addActionRow(modalTitle)
+            .addActionRow(modalInput)
+            .addActionRow(modalTag)
+            .build();
+
+        event.replyModal(transferModal).queue();
+    }
+
+    @Override
+    public void onModalSubmitted(ModalInteractionEvent event, List<String> args) {
+        event.deferEdit().queue();
+
+        String authorId = args.get(0);
+        String messageId = args.get(1);
+        String channelId = args.get(2);
+
+        event.getJDA()
+            .retrieveUserById(authorId)
+            .flatMap(fetchedUser -> createForumPost(event, fetchedUser))
+            .flatMap(createdforumPost -> dmUser(event.getChannel(), createdforumPost,
+                    event.getGuild()))
+            .flatMap(dmSent -> deleteOriginalMessage(event.getJDA(), channelId, messageId))
+            .queue();
+    }
+
+    private static String createTitle(String message) {
+        if (message.length() >= TITLE_GUESS_MAX_LENGTH) {
+            int lastWordEnd = message.lastIndexOf(' ', TITLE_GUESS_MAX_LENGTH);
+
+            if (lastWordEnd == -1) {
+                lastWordEnd = TITLE_GUESS_MAX_LENGTH;
+            }
+
+            message = message.substring(0, lastWordEnd);
+        }
+
+        return isTitleValid(message) ? message : "Untitled";
+    }
+
+    private static boolean isTitleValid(CharSequence title) {
+        String titleCompact = TITLE_GUESS_COMPACT_REMOVAL_PATTERN.matcher(title).replaceAll("");
+
+        return titleCompact.length() >= TITLE_GUESS_COMPACT_LENGTH_MIN
+                && titleCompact.length() <= TITLE_GUESS_COMPACT_LENGTH_MAX;
+    }
+
+    private RestAction<ForumPost> createForumPost(ModalInteractionEvent event, User originalUser) {
+
+        String originalMessage = event.getValue(MODAL_INPUT_ID).getAsString();
+
+        MessageEmbed embedForPost = makeEmbedForPost(originalUser, originalMessage);
+
+        MessageCreateData forumMessage = new MessageCreateBuilder()
+            .addContent("%s has a question:".formatted(originalUser.getAsMention()))
+            .setEmbeds(embedForPost)
+            .build();
+
+        String forumTitle = event.getValue(MODAL_TITLE_ID).getAsString();
+        String transferQuestionTag = event.getValue(MODAL_TAG).getAsString();
+
+        ForumChannel questionsForum = getHelperForum(event.getJDA());
+        String mostCommonTag = tags.get(0);
+
+        String queryTag =
+                StringDistances.closestMatch(transferQuestionTag, tags).orElse(mostCommonTag);
+
+        ForumTag tag = getTagOrDefault(questionsForum.getAvailableTagsByName(queryTag, true),
+                () -> questionsForum.getAvailableTagsByName(mostCommonTag, true).get(0));
+
+        return questionsForum.createForumPost(forumTitle, forumMessage)
+            .setTags(ForumTagSnowflake.fromId(tag.getId()))
+            .map(createdPost -> new ForumPost(originalUser, createdPost.getMessage()));
+    }
+
+    private RestAction<Message> dmUser(MessageChannelUnion sourceChannel, ForumPost forumPost,
+            Guild guild) {
+
+        String messageTemplate =
+                """
+                        Hello%s 👋 You have asked a question in the wrong channel%s. Not a big deal, but none of the experts who could help you are reading your question there 🙁
+
+                        Your question has been automatically transferred to %s, please continue there, thank you 👍
+                        """;
+
+        String messageForDm = messageTemplate.formatted("", " on" + " " + guild.getName(),
+                forumPost.message.getJumpUrl());
+
+        String messageOnDmFailure = messageTemplate.formatted(" " + forumPost.author.getAsMention(),
+                "", forumPost.message.getJumpUrl());
+
+        return forumPost.author.openPrivateChannel()
+            .flatMap(channel -> channel.sendMessage(messageForDm))
+            .onErrorFlatMap(error -> sourceChannel.sendMessage(messageOnDmFailure));
+    }
+
+    private RestAction<Void> deleteOriginalMessage(JDA jda, String channelId, String messageId) {
+        return jda.getTextChannelById(channelId).deleteMessageById(messageId);
+    }
+
+    private ForumChannel getHelperForum(JDA jda) {
+        Optional<ForumChannel> forumChannelOptional = jda.getForumChannels()
+            .stream()
+            .filter(forumChannel -> isHelpForumName.test(forumChannel.getName()))
+            .findFirst();
+
+        return forumChannelOptional.orElseThrow(() -> new IllegalStateException(
+                "Did not find the helper-forum while trying to transfer a question. Make sure the config is setup properly."));
+    }
+
+    private static ForumTag getTagOrDefault(List<ForumTag> tagsFoundOnForum,
+            Supplier<ForumTag> defaultTag) {
+        return tagsFoundOnForum.isEmpty() ? defaultTag.get() : tagsFoundOnForum.get(0);
+    }
+
+    private MessageEmbed makeEmbedForPost(User originalUser, String originalMessage) {
+        return new EmbedBuilder()
+            .setAuthor(originalUser.getName(), originalUser.getAvatarUrl(),
+                    originalUser.getAvatar().getUrl())
+            .setDescription(originalMessage)
+            .setColor(EMBED_COLOR)
+            .build();
+    }
+
+    private record ForumPost(User author, Message message) {
+    }
+}