diff options
Diffstat (limited to 'src/history.rs')
-rw-r--r-- | src/history.rs | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/src/history.rs b/src/history.rs index 5216d10..f8ffec2 100644 --- a/src/history.rs +++ b/src/history.rs @@ -13,6 +13,11 @@ pub struct History { data: Vec<Reading>, } +pub enum NoETA { + Pending, + Fuck, +} + impl History { pub fn record(&mut self, queue_size: u32) { self.data.push(Reading { @@ -21,30 +26,31 @@ impl History { }); } - pub fn completion_time(&self) -> Option<js_sys::Date> { + pub fn completion_time(&self) -> Result<js_sys::Date, NoETA> { // TODO make this not suck let &Reading { time: first_time, queue_size: first_size, .. - } = self.data.first()?; + } = self.data.first().ok_or(NoETA::Pending)?; let &Reading { time: last_time, queue_size: last_size, - } = self.data.last()?; + } = self.data.last().ok_or(NoETA::Pending)?; let overall_time_elapsed = last_time - first_time; if overall_time_elapsed.is_zero() { - return None; - } - let overall_queue_motion = first_size - last_size; - if overall_queue_motion == 0 { - return None; + return Err(NoETA::Pending); } + let overall_queue_motion = match first_size.checked_sub(last_size) { + Some(0) => return Err(NoETA::Pending), + Some(x) => x, + None => return Err(NoETA::Fuck), + }; let duration_per_step = overall_time_elapsed / overall_queue_motion as i32; let remaining_duration = duration_per_step * last_size as i32; let completion_time = last_time + remaining_duration; let completion_time_gmt = completion_time.timestamp_millis(); - Some(js_sys::Date::new(&JsValue::from( + Ok(js_sys::Date::new(&JsValue::from( completion_time_gmt as f64, ))) } |