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// god is dead and we have killed him and consequently std::time::Instant doesn't work on wasm
use chrono::prelude::*;
use wasm_bindgen::prelude::*;
struct Reading {
time: DateTime<Local>,
queue_size: u32,
}
#[derive(Default)]
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 {
time: Local::now(),
queue_size,
});
}
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().ok_or(NoETA::Pending)?;
let &Reading {
time: last_time,
queue_size: last_size,
} = self.data.last().ok_or(NoETA::Pending)?;
let overall_time_elapsed = last_time - first_time;
if overall_time_elapsed.is_zero() {
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();
Ok(js_sys::Date::new(&JsValue::from(
completion_time_gmt as f64,
)))
}
}
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