make private daily reminders system

maybe one day ill make a full remind system, who knows

.gitignore

@@ -5,3 +5,4 @@ config.prod.json
 config.testing.json
 apikeys.json
 database.db
+private_reminders.json

src/modules/private_reminders.js

@@ -0,0 +1,103 @@
+/*
+private_reminders.json example:
+[
+  {
+    "user": "user id",
+    "tz": "Etc/UTC",
+    "hour": 0,
+    "message": "it midnight"
+  }
+]
+*/
+
+const timer = require("../lib/timer");
+const fs = require("fs");
+const {resolve} = require("path");
+
+if (!fs.existsSync(resolve(__dirname, "..", "..", "private_reminders.json")))
+  return;
+
+const tzFormatterCache = {};
+const dmCache = {};
+
+const reminderData = require(resolve(
+  __dirname,
+  "..",
+  "..",
+  "private_reminders.json"
+));
+
+hf.database.run(
+  "CREATE TABLE IF NOT EXISTS private_reminders (user STRING NOT NULL PRIMARY KEY, last_run STRING NOT NULL) WITHOUT ROWID"
+);
+
+function setLastRun(id, date) {
+  return new Promise((resolve, reject) => {
+    hf.database.run(
+      "REPLACE INTO private_reminders VALUES ($key,$value)",
+      {
+        $value: date,
+        $key: id,
+      },
+      (err) => {
+        if (err == null) {
+          resolve(true);
+        } else {
+          reject(err);
+        }
+      }
+    );
+  });
+}
+
+function getLastRun(id) {
+  return new Promise((resolve, reject) => {
+    hf.database.get(
+      "SELECT last_run FROM private_reminders WHERE user = $key",
+      {
+        $key: id,
+      },
+      (err, row) => {
+        if (err == null) {
+          resolve(row?.value);
+        } else {
+          reject(err);
+        }
+      }
+    );
+  });
+}
+
+timer.add(
+  "private_reminders",
+  async () => {
+    for (const data of reminderData) {
+      if (!tzFormatterCache[data.tz]) {
+        tzFormatterCache[data.tz] = Intl.DateTimeFormat("en-US", {
+          dateStyle: "short",
+          timeStyle: "short",
+          hour12: false,
+          timeZone: data.tz,
+        });
+      }
+
+      if (!dmCache[data.user]) {
+        dmCache[data.user] = await hf.bot.getDMChannel(data.user);
+      }
+
+      const [date, time] = tzFormatterCache[data.tz]
+        .format(Date.now())
+        .split(", ");
+      let [hour, minutes] = time.split(":");
+      hour = parseInt(hour);
+      minutes = parseInt(minutes);
+      const lastRan = await getLastRun(data.user);
+
+      if (date != lastRan && hour == data.hour && minutes == 0) {
+        dmCache[data.user].createMessage(":alarm_clock: " + data.message);
+        await setLastRun(data.user, date);
+      }
+    }
+  },
+  1000
+);