feat(gateway:memberLeave): Log leaving users

1 files changed, 70 insertions, 0 deletions

diff --git a/packages/gateway/src/listeners/memberLeave.ts b/packages/gateway/src/listeners/memberLeave.ts
index 3fdef88..b78e86e 100644
--- a/packages/gateway/src/listeners/memberLeave.ts
+++ b/packages/gateway/src/listeners/memberLeave.ts
@@ -2,6 +2,50 @@ import { Client, Events, GuildMember } from "discord.js";
 import { RolePersistenceService } from "../database/rolePersistence";
 import { logUnexpectedDiscordAPIError } from "../utilities";
 
+const STAFF_GOODBYE_CHANNEL_ID = "1436588402052042874";
+
+const formatDuration = (milliseconds: number): string => {
+  const seconds = Math.floor(milliseconds / 1000);
+  const minutes = Math.floor(seconds / 60);
+  const hours = Math.floor(minutes / 60);
+  const days = Math.floor(hours / 24);
+  const months = Math.floor(days / 30);
+  const years = Math.floor(days / 365);
+
+  if (years > 0) {
+    const remainingMonths = Math.floor((days % 365) / 30);
+
+    if (remainingMonths > 0)
+      return `${years} year${years > 1 ? "s" : ""}, ${remainingMonths} month${remainingMonths > 1 ? "s" : ""}`;
+
+    return `${years} year${years > 1 ? "s" : ""}`;
+  }
+
+  if (months > 0) {
+    const remainingDays = days % 30;
+
+    if (remainingDays > 0)
+      return `${months} month${months > 1 ? "s" : ""}, ${remainingDays} day${remainingDays > 1 ? "s" : ""}`;
+
+    return `${months} month${months > 1 ? "s" : ""}`;
+  }
+
+  if (days > 0) {
+    const remainingHours = hours % 24;
+
+    if (remainingHours > 0)
+      return `${days} day${days > 1 ? "s" : ""}, ${remainingHours} hour${remainingHours > 1 ? "s" : ""}`;
+
+    return `${days} day${days > 1 ? "s" : ""}`;
+  }
+
+  if (hours > 0) return `${hours} hour${hours > 1 ? "s" : ""}`;
+
+  if (minutes > 0) return `${minutes} minute${minutes > 1 ? "s" : ""}`;
+
+  return `${seconds} second${seconds > 1 ? "s" : ""}`;
+};
+
 export const handleMemberLeave = (client: Client) => {
   client.on(Events.GuildMemberRemove, async (member) => {
     try {
@@ -9,6 +53,32 @@ export const handleMemberLeave = (client: Client) => {
 
       if ("roles" in member)
         await RolePersistenceService.saveUserRoles(member as GuildMember);
+
+      try {
+        const goodbyeChannel = client.channels.cache.get(
+          STAFF_GOODBYE_CHANNEL_ID,
+        );
+
+        if (
+          goodbyeChannel &&
+          goodbyeChannel.isTextBased() &&
+          !goodbyeChannel.isDMBased()
+        ) {
+          const joinedAt = member.joinedAt;
+
+          let message = `${member.user} left the server.`;
+
+          if (joinedAt) {
+            const membershipDuration = Date.now() - joinedAt.getTime();
+
+            message += ` They were a member for ${formatDuration(membershipDuration)}.`;
+          }
+
+          await goodbyeChannel.send(message);
+        }
+      } catch (error) {
+        logUnexpectedDiscordAPIError(error);
+      }
     } catch (error) {
       logUnexpectedDiscordAPIError(error);
     }