feat: update booster role eligibility logic and refactor related services

src/discord/bot.ts

@@ -0,0 +1,42 @@
+import { Database } from "bun:sqlite";
+import type { Client } from "discord.js";
+import type { AppConfig } from "../config";
+import { BoosterRoleService } from "../services/boosterRoleService";
+import { BunSqliteBoosterRoleStore } from "../services/bunSqliteBoosterRoleStore";
+import { DiscordRoleRepository } from "../services/discordRoleRepository";
+import { handleGuildMemberUpdate } from "./events/guildMemberUpdate";
+import { handleInteraction } from "./interactionHandler";
+
+export function attachBotHandlers(client: Client, config: AppConfig): void {
+  const db = new Database(config.databaseUrl.replace(/^file:/, ""));
+  const store = new BunSqliteBoosterRoleStore(db);
+
+  client.on("interactionCreate", async (interaction) => {
+    if (!interaction.isChatInputCommand() || !interaction.guild) return;
+
+    const service = new BoosterRoleService(
+      store,
+      new DiscordRoleRepository(interaction.guild, config.boosterRoleAnchorRoleId),
+      { anchorPosition: resolveAnchorPosition(interaction.guild, config.boosterRoleAnchorRoleId) }
+    );
+
+    await handleInteraction(interaction, service, {
+      isBoosting: async () => Boolean(interaction.member && "premiumSince" in interaction.member && interaction.member.premiumSince)
+    });
+  });
+
+  client.on("guildMemberUpdate", async (oldMember, newMember) => {
+    const service = new BoosterRoleService(
+      store,
+      new DiscordRoleRepository(newMember.guild, config.boosterRoleAnchorRoleId),
+      { anchorPosition: resolveAnchorPosition(newMember.guild, config.boosterRoleAnchorRoleId) }
+    );
+
+    await handleGuildMemberUpdate(oldMember, newMember, service);
+  });
+}
+
+function resolveAnchorPosition(guild: { roles: { cache: { get(id: string): { position: number } | undefined } } }, anchorRoleId: string | null): number {
+  if (!anchorRoleId) return 1;
+  return guild.roles.cache.get(anchorRoleId)?.position ?? 1;
+}