add user lookup command

src/main/java/cc/fascinated/bat/common/LongUtils.java

@@ -0,0 +1,21 @@
+package cc.fascinated.bat.common;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+public class LongUtils {
+    /**
+     * Checks if a string is a long
+     *
+     * @param string the string to check
+     * @return if the string is a long
+     */
+    public static boolean isLong(String string) {
+        try {
+            Long.parseLong(string);
+            return true;
+        } catch (NumberFormatException exception) {
+            return false;
+        }
+    }
+}

src/main/java/cc/fascinated/bat/features/base/BaseFeature.java

@@ -3,6 +3,7 @@ package cc.fascinated.bat.features.base;
 import cc.fascinated.bat.command.Category;
 import cc.fascinated.bat.features.Feature;
 import cc.fascinated.bat.features.base.commands.botadmin.premium.PremiumAdminCommand;
+import cc.fascinated.bat.features.base.commands.discord.LookupUserCommand;
 import cc.fascinated.bat.features.base.commands.fun.EightBallCommand;
 import cc.fascinated.bat.features.base.commands.fun.image.ImageCommand;
 import cc.fascinated.bat.features.base.commands.general.*;
@@ -41,5 +42,6 @@ public class BaseFeature extends Feature {
         super.registerCommand(commandService, context.getBean(ImageCommand.class));
         super.registerCommand(commandService, context.getBean(FeatureCommand.class));
         super.registerCommand(commandService, context.getBean(EightBallCommand.class));
+        super.registerCommand(commandService, context.getBean(LookupUserCommand.class));
     }
 }

src/main/java/cc/fascinated/bat/features/base/commands/discord/LookupUserCommand.java

@@ -0,0 +1,80 @@
+package cc.fascinated.bat.features.base.commands.discord;
+
+import cc.fascinated.bat.command.BatCommand;
+import cc.fascinated.bat.command.CommandInfo;
+import cc.fascinated.bat.common.EmbedDescriptionBuilder;
+import cc.fascinated.bat.common.EmbedUtils;
+import cc.fascinated.bat.common.LongUtils;
+import cc.fascinated.bat.model.BatGuild;
+import cc.fascinated.bat.model.BatUser;
+import cc.fascinated.bat.service.DiscordService;
+import lombok.NonNull;
+import net.dv8tion.jda.api.entities.Member;
+import net.dv8tion.jda.api.entities.User;
+import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
+import net.dv8tion.jda.api.interactions.commands.OptionMapping;
+import net.dv8tion.jda.api.interactions.commands.OptionType;
+import net.dv8tion.jda.api.interactions.commands.SlashCommandInteraction;
+import org.springframework.stereotype.Component;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+@Component
+@CommandInfo(name = "lookupuser", description = "Lookup a user")
+public class LookupUserCommand extends BatCommand {
+    public LookupUserCommand() {
+        super.addOption(OptionType.STRING, "id", "The id of the user", true);
+    }
+
+    @Override
+    public void execute(BatGuild guild, @NonNull BatUser user, @NonNull MessageChannel channel, Member member, @NonNull SlashCommandInteraction event) {
+        OptionMapping idOption = event.getOption("id");
+        if (idOption == null) {
+            return;
+        }
+        String id = idOption.getAsString();
+        if (!LongUtils.isLong(id)) {
+            event.replyEmbeds(EmbedUtils.errorEmbed()
+                            .setDescription("You need to provide a valid user id")
+                            .build())
+                    .setEphemeral(true)
+                    .queue();
+            return;
+        }
+
+        DiscordService.JDA.retrieveUserById(id).queue(target -> {
+            if (target == null) {
+                event.replyEmbeds(EmbedUtils.errorEmbed()
+                                .setDescription("User `%s` not found".formatted(id))
+                                .build())
+                        .setEphemeral(true)
+                        .queue();
+                return;
+            }
+
+            // The flags of the user (eg. Discord Partner, Hypesquad Events, etc.)
+            StringBuilder flags = new StringBuilder();
+            for (User.UserFlag flag : target.getFlags()) {
+                flags.append(flag.getName()).append(", ");
+            }
+
+            target.retrieveProfile().queue(profile -> event.replyEmbeds(EmbedUtils.genericEmbed()
+                            .setDescription(new EmbedDescriptionBuilder("User Lookup")
+                                    .appendLine("Name: `%s`".formatted(target.getGlobalName()), true)
+                                    .appendLine("Username: `%s`".formatted(target.getName()), true)
+                                    .appendLine("ID: `%s`".formatted(target.getId()), true)
+                                    .appendLine("Flags: `%s`".formatted(flags.toString().isEmpty() ? "None" : flags.substring(0, flags.length() - 2)), true)
+                                    .appendLine("Joined Discord: <t:%s:R>".formatted(target.getTimeCreated().toEpochSecond()), true)
+                                    .appendLine("Avatar: %s".formatted(target.getAvatar() == null ? "None"
+                                            : "[click here](%s)".formatted(target.getAvatar().getUrl(4096))), true)
+                                    .appendLine("Banner: %s".formatted(profile.getBanner() == null ? "None"
+                                            : "[click here](%s)".formatted(profile.getBanner().getUrl(4096))), true)
+                                    .build())
+                            .setThumbnail(target.getAvatar() == null ? null : target.getAvatar().getUrl(4096))
+                            .build())
+                    .setEphemeral(true)
+                    .queue());
+        });
+    }
+}