Added logic for ringer and scheduler. still wip

src/scheduler.rs

@@ -0,0 +1,40 @@
+use std::sync::{Arc, Mutex};
+
+use chrono::Local;
+use cron_tab::Cron;
+
+use crate::ringer::Ringer;
+
+#[derive(Debug)]
+pub struct Scheduler<T: Ringer + 'static> {
+    ringer: Arc<Mutex<T>>,
+    cron: Arc<Mutex<Cron<Local>>>,
+}
+
+impl<T: Ringer> Scheduler<T> {
+    pub fn new(ringer: Arc<Mutex<T>>, cron: Arc<Mutex<Cron<Local>>>) -> Self {
+        Self { ringer, cron }
+    }
+
+    pub fn schedule(&self, cron_schedule: &str) -> Result<(), String> {
+        let ringer = self.ringer.clone();
+        let cron = self.cron.clone();
+
+        let job_result = cron
+            .lock()
+            .map_err(|e| e.to_string())?
+            .add_fn(cron_schedule, move || {
+                let guard = ringer.lock();
+                if let Ok(ringer) = guard {
+                    ringer.ring().unwrap();
+                }
+            });
+
+        job_result.expect("Faild to add job");
+        todo!()
+    }
+
+    pub fn start(&self) {
+        self.cron.lock().expect("Failed to lock cron").start();
+    }
+}