cal7tor/src/timetable.rs
2022-08-16 15:48:13 +02:00

281 lines
9.2 KiB
Rust

use chrono::{Datelike, Duration, TimeZone, Utc};
use regex::Regex;
use scraper::{Html, Selector};
pub mod models;
/// Fetch the timetable for a class
pub async fn timetable(
year: i8,
semester: i8,
letter: Option<char>,
) -> (Vec<String>, (usize, Vec<models::Day>)) {
let document = get_webpage(year, semester, letter)
.await
.expect("Can't reach timetable website.");
// Selectors
let sel_table = Selector::parse("table").unwrap();
let sel_tr = Selector::parse("tr").unwrap();
let sel_tbody = Selector::parse("tbody").unwrap();
let sel_th = Selector::parse("th").unwrap();
let sel_td = Selector::parse("td").unwrap();
let sel_em = Selector::parse("em").unwrap();
let sel_small = Selector::parse("small").unwrap();
let sel_strong = Selector::parse("strong").unwrap();
// Find the timetable
let raw_timetable = document.select(&sel_table).next().unwrap();
// Find the slots available for the timetable
let raw_schedules = raw_timetable.select(&sel_tr).next().unwrap();
// Find availables schedules
let mut schedules = Vec::new();
for time in raw_schedules.select(&sel_th) {
schedules.push(time.inner_html());
}
// Find the timetable values
let raw_timetable_values = raw_timetable.select(&sel_tbody).next().unwrap();
// For each days
let mut timetable = Vec::new();
for day in raw_timetable_values.select(&sel_tr) {
let mut courses_vec = Vec::new();
let mut location_tracker = 0;
for course in day.select(&sel_td) {
if course.inner_html() == "" {
courses_vec.push(None);
location_tracker += 1;
} else {
courses_vec.push(Some(models::Course {
name: course.select(&sel_em).next().unwrap().inner_html(),
professor: match course
.select(&sel_small)
.next()
.unwrap()
.inner_html()
.split("<br>")
.next()
{
Some(data) => {
if data.contains("</strong>") {
// This is the room, so there is no professor assigned
// to this courses yet
None
} else {
Some(data.to_string())
}
}
None => None,
},
room: course
.select(&sel_strong)
.next()
.unwrap()
.inner_html()
.replace("<br>", ""),
start: location_tracker,
size: match course.value().attr("colspan") {
Some(i) => i.parse().unwrap(),
None => 1,
},
dtstart: None,
dtend: None,
}));
match &courses_vec[courses_vec.len() - 1] {
Some(course) => location_tracker += course.size,
None => location_tracker += 1,
}
}
}
timetable.push(models::Day {
name: day.select(&sel_th).next().unwrap().inner_html(),
courses: courses_vec,
})
}
if !check_consistency(&schedules, &timetable) {
panic!("Error when building the timetable.");
}
(schedules, (semester as usize, timetable))
}
/// Get timetable webpage
async fn get_webpage(
year: i8,
semester: i8,
letter: Option<char>,
) -> Result<Html, Box<dyn std::error::Error>> {
let url = {
let panic_semester_message = "Unknown semester.";
let panic_letter_message = "Unknown letter.";
let base_url = "https://informatique.up8.edu/licence-iv/edt";
match year {
1 => {
let allow_letters = match semester {
1 => ['a', 'b', 'c'],
2 => ['x', 'y', 'z'],
_ => panic!("{}", panic_semester_message),
};
let c = letter.expect(panic_letter_message);
if allow_letters.contains(&c) {
format!("{}/l1-{}.html", base_url, c)
} else {
panic!("{}", panic_letter_message)
}
}
2 => {
let allow_letters = match semester {
1 => ['a', 'b'],
2 => ['x', 'y'],
_ => panic!("{}", panic_semester_message),
};
let c = letter.expect(panic_letter_message);
if allow_letters.contains(&c) {
format!("{}/l2-{}.html", base_url, c)
} else {
panic!("{}", panic_letter_message)
}
}
3 => match semester {
1 => format!("{}/l3.html", base_url),
2 => format!("{}/l3_2.html", base_url),
_ => panic!("{}", panic_semester_message),
},
_ => panic!("Unknown year."),
}
};
// Get raw html
let html = reqwest::get(&url).await?.text().await?;
// Panic on error
crate::utils::check_errors(&html, &url);
// Parse document
let document = Html::parse_document(&html);
Ok(document)
}
/// Check if the timetable is well built
fn check_consistency(schedules: &Vec<String>, timetable: &Vec<models::Day>) -> bool {
let mut checker = true;
for day in timetable {
let mut i = 0;
for course in &day.courses {
match course {
Some(course_it) => {
// Checks the consistency of course start times
if i != course_it.start {
checker = false;
break;
}
// Keep the track of how many courses are in the day
i += course_it.size
}
None => i += 1,
}
}
// The counter should be the same as the amount of possible hours of the day
if i != schedules.len() {
checker = false;
break;
}
}
checker
}
// Data builded in the timetable webpage
type T = (
// Schedules
Vec<String>,
// Timetable per days with the semester as the key
(usize, Vec<models::Day>),
);
// Data builded in the info webpage
type D = std::collections::HashMap<
// Semester
usize,
// List of start and repetition of course weeks
Vec<(chrono::DateTime<Utc>, i64)>,
>;
/// Build the timetable
pub fn build(timetable: T, dates: D) -> Vec<models::Course> {
let mut schedules = Vec::new();
// h1 => heure de début | m1 => minute de début
// h2 => heure de fin | m2 => minute de fin
let re =
Regex::new(r"(?P<h1>\d{1,2})h(?P<m1>\d{1,2})?.(?P<h2>\d{1,2})h(?P<m2>\d{1,2})?").unwrap();
for hour in timetable.0 {
let captures = re.captures(&hour).unwrap();
let h1 = match captures.name("h1") {
Some(h) => h.as_str().parse().unwrap(),
None => 0,
};
let m1 = match captures.name("m1") {
Some(h) => h.as_str().parse().unwrap(),
None => 0,
};
let h2 = match captures.name("h2") {
Some(h) => h.as_str().parse().unwrap(),
None => 0,
};
let m2 = match captures.name("m2") {
Some(h) => h.as_str().parse().unwrap(),
None => 0,
};
schedules.push(((h1, m1), (h2, m2)));
}
// Store all the courses for the semester
let mut semester = Vec::new();
// Start date of the back-to-school week
let datetimes = dates.get(&timetable.1 .0).unwrap();
let before_break = datetimes.get(0).unwrap();
let mut date = before_break.0;
let mut rep = before_break.1;
// For each weeks
for _ in 0..2 {
for _ in 0..rep {
for day in &timetable.1 .1 {
for mut course in day.courses.clone().into_iter().flatten() {
// Get the hours
let start = schedules.get(course.start).unwrap().0;
// -1 because we only add when the size is > 1
let end = schedules.get(course.start + course.size - 1).unwrap().1;
// Add the changed datetimes
course.dtstart = Some(
Utc.ymd(date.year(), date.month(), date.day())
.and_hms(start.0, start.1, 0),
);
course.dtend = Some(
Utc.ymd(date.year(), date.month(), date.day())
.and_hms(end.0, end.1, 0),
);
semester.push(course);
}
date += Duration::days(1);
}
// From friday to monday
date += Duration::days(2);
}
let after_break = datetimes.get(1).unwrap();
date = after_break.0;
rep = after_break.1;
}
semester
}