feat: add reservation booking

affluences-api/src/models/available.rs

@@ -73,4 +73,13 @@ impl Resource {
             .filter(|(hour, _)| hour.state == 1)
             .collect()
     }
+
+    /// Returns whether a slot with the given state and time bounds is present in the list of
+    /// hours.
+    pub fn has_slot(&self, start_time: NaiveTime, end_time: NaiveTime, state: u32) -> bool {
+        self.condensed_hours()
+            .into_iter()
+            .filter(|(block, _)| block.state == state)
+            .any(|(block, duration)| start_time >= block.hour && end_time <= block.hour + duration)
+    }
 }