fix: Don't allow unregistering whilst the user has submissions.

Author: MerchantCalico

src/main/java/net/modgarden/gardenbot/commands/event/UnregisterHandler.java

@@ -5,33 +5,61 @@
 import net.dv8tion.jda.api.entities.User;
 import net.modgarden.gardenbot.GardenBot;
 import net.modgarden.gardenbot.interaction.SlashCommandInteraction;
+import net.modgarden.gardenbot.interaction.response.EmbedResponse;
 import net.modgarden.gardenbot.interaction.response.MessageResponse;
 import net.modgarden.gardenbot.interaction.response.Response;
 import net.modgarden.gardenbot.util.ModGardenAPIClient;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.net.http.HttpResponse;
 
 public class UnregisterHandler {
 	public static Response handleEventUnregister(SlashCommandInteraction interaction) {
 		interaction.event().deferReply(true).queue();
-		User user = interaction.event().getUser();
+		User discordUser = interaction.event().getUser();
 		Guild guild = interaction.event().getGuild();
 
+		ModGardenUser user;
 		try {
-			HttpResponse<InputStream> stream = ModGardenAPIClient.get("user/" + user.getId() + "?service=discord", HttpResponse.BodyHandlers.ofInputStream());
-			if (stream.statusCode() != 200) {
+			HttpResponse<InputStream> userResult = ModGardenAPIClient.get("user/" + discordUser.getId() + "?service=discord", HttpResponse.BodyHandlers.ofInputStream());
+			if (userResult.statusCode() != 200) {
 				return new MessageResponse()
 						.setMessage("You do not have a Mod Garden account.\nPlease create one with **/account create**.")
 						.markEphemeral();
 			}
+			try (InputStreamReader userReader = new InputStreamReader(userResult.body())) {
+				user = GardenBot.GSON.fromJson(userReader, ModGardenUser.class);
+			}
 		} catch (IOException | InterruptedException ex) {
 			GardenBot.LOG.error("", ex);
+			return new EmbedResponse()
+					.setTitle("Encountered an exception whilst attempting to unregister from a Mod Garden event.")
+					.setDescription(ex.getMessage() + "\nPlease report this to a team member.")
+					.setColor(0xFF0000);
+		}
+
+		try {
+			HttpResponse<InputStream> eventSubmissionsResult = ModGardenAPIClient.get(
+					"user/" + user.id + "/submissions/mod-garden-nature",
+					HttpResponse.BodyHandlers.ofInputStream()
+			);
+			if (eventSubmissionsResult.statusCode() == 200) {
+				try (InputStreamReader eventSubmissionsReader = new InputStreamReader(eventSubmissionsResult.body())) {
+					JsonElement eventSubmissions = JsonParser.parseReader(eventSubmissionsReader);
+					if (eventSubmissions.isJsonArray() && !eventSubmissions.getAsJsonArray().isEmpty()) {
+						return new MessageResponse()
+								.setMessage("You may not unregister whilst you have submissions to Mod Garden: Nature.")
+								.markEphemeral();
+					}
+				}
+			}
+		}catch (IOException | InterruptedException ex) {
+			GardenBot.LOG.error("", ex);
 		}
 
 		if (guild != null && guild.getId().equals(GardenBot.DOTENV.get("GUILD_ID"))) {
-			// TODO: Unhardcode from Mod Garden: Nature and save data into backend user.
 			Role role = guild.getRoleById("1320329531990741053");
 			if (role == null) {
 				return new MessageResponse()
@@ -43,7 +71,7 @@ public static Response handleEventUnregister(SlashCommandInteraction interaction
 						.setMessage("You not a Mod Garden: Nature participant.")
 						.markEphemeral();
 			}
-			guild.removeRoleFromMember(user, role).complete();
+			guild.removeRoleFromMember(discordUser, role).complete();
 			return new MessageResponse()
 					.setMessage("Successfully removed you as a participant from Mod Garden: Nature.")
 					.markEphemeral();
@@ -52,4 +80,8 @@ public static Response handleEventUnregister(SlashCommandInteraction interaction
 				.setMessage("This command needs to be run inside the Mod Garden Discord server.")
 				.markEphemeral();
 	}
+
+	private static class ModGardenUser {
+		String id;
+	}
 }