add check-limit command

src/commands/check-limit.ts

@@ -0,0 +1,68 @@
+import { ApplicationCommandType, ChatInputCommandInteraction, ApplicationCommandOption, ApplicationCommandOptionType } from "discord.js";
+
+import Command from "../command";
+import { getUserLimit, getNthUseInLimitTimestamp } from "../execution";
+
+export default class MyLimit extends Command implements Command {
+  name = "check-limit";
+  description = "Checks your limits and remaining usage";
+  type = ApplicationCommandType.ChatInput;
+  options: ApplicationCommandOption[] = [
+    {
+      name: "recovery-for",
+      description: "Calculate the limit recovery time for given message count (default 1)",
+      type: ApplicationCommandOptionType.Integer,
+      required: false,
+    },
+    {
+      name: "ephemeral",
+      description: "if true, only you can see the response (default true)",
+      type: ApplicationCommandOptionType.Boolean,
+    }
+  ];
+
+  async execute(interaction: ChatInputCommandInteraction) {
+    let recoveryFor = interaction.options.getInteger("recovery-for", false) ?? 1;
+    const ephemeral = interaction.options.getBoolean("ephemeral", false) ?? true;
+
+    if (recoveryFor <= 0) recoveryFor = 1;
+
+    const userLimitPromise = getUserLimit(interaction.user, interaction.createdAt);
+    const nthUseInLimitTimestampPromise = getNthUseInLimitTimestamp(
+      interaction.user,
+      interaction.createdAt,
+      recoveryFor,
+    );
+
+    const userLimit = await userLimitPromise;
+    const nthUseInLimitTimestamp = await nthUseInLimitTimestampPromise;
+
+    if (userLimit === false || nthUseInLimitTimestamp === false) {
+      interaction.reply({
+        embeds: [{
+          author: { name: interaction.user.username, icon_url: interaction.user.displayAvatarURL({ size: 128 }) },
+          description: "User is a VIP, so there is no limit",
+        }],
+        ephemeral: ephemeral,
+      });
+      return;
+    }
+
+    interaction.reply({
+      embeds: [{
+        author: { name: interaction.user.username, icon_url: interaction.user.displayAvatarURL({ size: 128 }) },
+        fields: [
+          { name: "Limit", inline: true, value: String(userLimit.limit) },
+          { name: "Usage", inline: true, value: String(userLimit.limit - userLimit.remaining) },
+          {
+            name: `Recovery for ${recoveryFor} message${recoveryFor>1 ? "s" : ""}`,
+            value: nthUseInLimitTimestamp === null ? "never" :
+                  // timestamp of the nth use in limit + 24 hours
+                  `<t:${Math.floor(new Date(nthUseInLimitTimestamp.getTime() + 1000 * 60 * 60 * 24 /*24 hours*/).getTime()/1000)}:R>`,
+          },
+        ]
+      }],
+      ephemeral: ephemeral,
+    });
+  }
+}