feat: implemented sync status update function in repository

src/gpodder/repository.rs

@@ -1,4 +1,4 @@
-use std::sync::Arc;
+use std::{collections::HashSet, sync::Arc};
 
 use argon2::{Argon2, PasswordHash, PasswordVerifier};
 use chrono::{DateTime, TimeDelta, Utc};
@@ -100,7 +100,30 @@ impl GpodderRepository {
         sync: Vec<Vec<&str>>,
         unsync: Vec<&str>,
     ) -> Result<(), AuthErr> {
-        todo!("perform diff devices to sync and unsync")
+        let now = Utc::now();
+        let mut unsync: HashSet<&str> = HashSet::from_iter(unsync);
+        let original_unsync = unsync.clone();
+
+        for group in sync {
+            // We want to remove devices that are provided in both a sync group and the unsync
+            // category, as this does not make sense to perform. We use the original unsync array,
+            // as a device could be provided multiple times in different sync groups.
+            let (remove, remaining): (Vec<&str>, Vec<&str>) =
+                group.into_iter().partition(|d| original_unsync.contains(d));
+
+            for device_id in remove {
+                unsync.remove(device_id);
+            }
+
+            let group_id = self.store.merge_sync_groups(user, remaining)?;
+            self.store.synchronize_sync_group(group_id, now)?;
+        }
+
+        // Finally we unsync the remaining devices
+        self.store
+            .remove_from_sync_group(user, unsync.into_iter().collect())?;
+
+        Ok(())
     }
 
     pub fn devices_by_sync_group(