working on tick()

src/lib.rs

@@ -1,3 +1,5 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
 #[derive(Debug)]
 pub enum Version {
     ENHANCED,
@@ -62,7 +64,7 @@ impl<T> Icechip<T> {
 
     // the offset will get subtracted from the unix epoch before being used in the Icechip.
     pub fn set_epoch_offset(mut self, offset: u64) {
-        self.epoch = Some(offset);
+        self.epoch = Some(UNIX_EPOCH - offset);
     }
 
     pub fn tick(&self) -> Icechip<T> {
@@ -70,7 +72,68 @@ impl<T> Icechip<T> {
             - if current timestamp in relation to self does not equal self, return an updated value, else increment the sequence
             - if sequence is going to overflow, sleep 1 ms
         */
-        todo!();
+        match SystemTime::now().duration_since(UNIX_EPOCH) {
+            Ok(o) => {
+                match self.version {
+                    Version::ENHANCED => {
+                        let curr_ts = match self.epoch {
+                            Some(s) => (o - s).checked_shl(23).unwrap().checked_shr(23).unwrap(),
+                            None => o.checked_shl(23).unwrap().checked_shr(23).unwrap(),
+                        }
+                        if self.timestamp == curr_ts {
+                            if (self.sequence_id + 1) > 1023 {
+                                std::thread::sleep(std::time::Duration::from_millis(1));
+                                return self.tick();
+                            } else {
+                                return Icechip {
+                                    version: self.version.clone(),
+                                    timestamp: self.timestamp.clone(),
+                                    machine_id: self.machine_id.clone(),
+                                    sequence_id: self.sequence_id.clone() + 1,
+                                    epoch: self.epoch.clone()
+                                }
+                            }
+                        } else {
+                            return Icechip {
+                                version: self.version.clone(),
+                                timestamp: curr_ts.clone(),
+                                machine_id: self.machine_id.clone(),
+                                sequence_id: 0,
+                                epoch: self.epoch.clone()
+                            }
+                        }
+                    },
+                    Version::EXTENDED => {
+                        if self.timestamp == o {
+                            if (self.sequence_id + 1) > u32::MAX {
+                                std::thread::sleep(std::time:Duration::from_millis(1));
+                                return self.tick();
+                            } else {
+                                return Icechip {
+                                    version: self.version.clone(),
+                                    timestamp: self.timestamp.clone(),
+                                    machine_id: self.machine_id.clone(),
+                                    sequence_id: self.sequence_id.clone() + 1,
+                                    epoch: self.epoch.clone()
+                                }
+                            }
+                        } else {
+                            return Icechip {
+                                version: self.version.clone(),
+                                timestamp: o.clone(),
+                                machine_id: self.machine_id.clone(),
+                                sequence_id: 0,
+                                epoch: self.epoch.clone()
+                            }
+                        }
+                    },
+                }
+            },
+            Err(_) => {
+                std::thread::sleep(std::time::Duration::from_millis(1));
+                return self.tick();
+            }
+        }
     }
     
     pub fn with_id(machine_id: u32, version: Version) -> Icechip<T> {