Display the arrival time correctly

Cargo.toml

@@ -14,7 +14,7 @@ zip = "8.3"
 csv = "1.4"
 
 [profile.dev]
-opt-level = 0
+opt-level = 3
 
 [profile.release]
 opt-level = 3

resources/gtfs.rs

@@ -0,0 +1,132 @@
+use gtfs_structures::{Agency, Calendar, CalendarDate, Route, Stop};
+use serde::{de::DeserializeOwned};
+use std::{collections::HashMap, fs::File};
+use zip::ZipArchive;
+
+// The main GTFS struct. This is similar to (but not exactly) gtfs-structures::Gtfs because we don't need everything
+#[derive(Debug)]
+pub struct Gtfs {
+    /// All agencies. They can not be read by `agency_id`, as it is not a required field
+    pub agencies: Vec<Agency>,
+    /// All Calendar by `service_id`
+    pub calendar: HashMap<String, Calendar>,
+    /// All calendar dates grouped by service_id
+    pub calendar_dates: HashMap<String, Vec<CalendarDate>>,
+    /// All routes by `route_id`
+    pub routes: HashMap<String, Route>,
+    /// All stop by `stop_id`.
+    pub stops: HashMap<String, Stop>,
+}
+
+// Utility function to load all records in a dataset
+fn load_all<V>(_: &V) -> bool { true } 
+
+// Loads a vector of the selected type
+fn load_vector<T: serde::de::DeserializeOwned>(
+    destination: &mut Vec<T>,
+    zip_reader: &mut ZipArchive<File>,
+    table_name: &str,
+) {
+    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let mut rdr = csv::Reader::from_reader(file_reader);
+
+    for row in rdr.deserialize() {
+        let record: T = row.unwrap();
+        destination.push(record);
+    }
+}
+
+// Loads a HashMap of the selected type, using the provided index function as the key
+fn load_map<'a, V: DeserializeOwned>(
+    destination: &mut HashMap<String, V>,
+    zip_reader: &mut ZipArchive<File>,
+    table_name: &str,
+    index: fn(&V) -> String,
+    accept: fn(&V) -> bool,
+) {
+    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let mut rdr = csv::Reader::from_reader(file_reader);
+
+    for row in rdr.deserialize() {
+        let record: V = row.unwrap();
+        if accept(&record) {
+            let idx: String = index(&record);
+            destination.insert(idx, record);
+        }
+    }
+}
+
+// Loads a HashMap of a vector of the selected type, using the provided index function as the key
+// And a predicate as a filter
+fn load_vector_map<'a, V: DeserializeOwned + Clone>(
+    destination: &mut HashMap<String, Vec<V>>,
+    zip_reader: &mut ZipArchive<File>,
+    table_name: &str,
+    index: fn(&V) -> String,
+    accept: fn(&V) -> bool,
+) {
+    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let mut rdr = csv::Reader::from_reader(file_reader);
+
+    for row in rdr.deserialize() {
+        let record: V = row.unwrap();
+        if accept(&record) {
+            let idx: String = index(&record);
+            destination.entry(idx).or_insert_with(Vec::new).push(record);
+        }
+    }
+}
+
+pub fn init(src_file: &str, routes: Vec<String>) -> Gtfs {
+    // Open zip file
+    let mut zip_reader = zip::ZipArchive::new(File::open(src_file).unwrap()).unwrap();
+
+    let mut gtfs: Gtfs = Gtfs {
+        agencies: Vec::new(),
+        calendar: HashMap::new(),
+        calendar_dates: HashMap::new(),
+        routes: HashMap::new(),
+        stops: HashMap::new(),
+    };
+
+    // Agencies
+    load_vector(&mut gtfs.agencies, &mut zip_reader, "agency.txt");
+
+    // Calendars
+    load_map(
+        &mut gtfs.calendar,
+        &mut zip_reader,
+        "calendar.txt",
+        |c: &Calendar| String::from(&c.id),
+        load_all
+    );
+
+    // Calendar Dates
+    load_vector_map(
+        &mut gtfs.calendar_dates,
+        &mut zip_reader,
+        "calendar_dates.txt",
+        |d: &CalendarDate| String::from(&d.service_id),
+        load_all
+    );
+
+    // Stops
+    load_map(&mut gtfs.stops, 
+        &mut zip_reader, 
+        "stops.txt", 
+        |s: &Stop| {String::from(&s.id)},
+        load_all
+    );
+
+    // Routes
+    let accept_filter: fn(&Route) -> bool = (| rs: Vec<String>, r: &Route | {rs.contains(&r.short_name.unwrap())}).curry(routes);
+    load_map(
+        &mut gtfs.routes,
+        &mut zip_reader,
+        "routes.txt",
+        |r: &Route| String::from(&r.id),
+        accept_filter
+    );
+
+    return gtfs;
+}

src/gtfs/loader.rs

@@ -1,6 +1,6 @@
 use log::debug;
 use gtfs_structures::{Calendar, CalendarDate, RawStopTime, RawTrip, Route, Stop};
-use serde::de::{DeserializeOwned, value::MapAccessDeserializer};
+use serde::de::{DeserializeOwned};
 use std::{
     collections::{HashMap, HashSet},
     fs::File,

src/gtfs/mod.rs

@@ -2,7 +2,7 @@ mod arrival;
 mod loader;
 mod utils;
 pub mod structs;
-use chrono::{DateTime, Local, NaiveTime, Timelike};
+use chrono::{DateTime, Local, Timelike};
 use log::{debug};
 use std::{
     collections::{HashMap, HashSet}, fs::File, io::Error

src/gtfs/structs.rs

@@ -1,6 +1,5 @@
 use std::collections::{HashMap, HashSet};
 
-use chrono::NaiveTime;
 use gtfs_structures::{Agency, Calendar, CalendarDate, RawStopTime, RawTrip, Route, Stop};
 
 // This is to store the preferences for the GTFS(-R) side of the code.
@@ -32,7 +31,7 @@ pub struct Gtfs {
 
 #[derive(Debug)]
 pub struct Arrival<'a> {
-    pub departure_time: i64,
+    pub departure_time: u32,
     pub route: &'a Route,
     pub stop: &'a Stop,
     pub stop_time: &'a RawStopTime,

src/gtfs/utils.rs

@@ -1,7 +1,7 @@
 use std::collections::HashSet;
 use crate::gtfs::Gtfs;
 
-pub fn stop_ids_from_codes(gtfs: &Gtfs, stop_codes: &HashSet<String>) -> HashSet<String> {
+pub(crate) fn stop_ids_from_codes(gtfs: &Gtfs, stop_codes: &HashSet<String>) -> HashSet<String> {
     let mut ids: HashSet<String> = HashSet::new();
 
     for stop in &gtfs.stops {
@@ -13,7 +13,7 @@ pub fn stop_ids_from_codes(gtfs: &Gtfs, stop_codes: &HashSet<String>) -> HashSet
     return ids;
 }
 
-pub fn route_ids_from_numbers(gtfs: &Gtfs, route_numbers: &HashSet<String>) -> HashSet<String> {
+pub(crate) fn route_ids_from_numbers(gtfs: &Gtfs, route_numbers: &HashSet<String>) -> HashSet<String> {
     let mut ids: HashSet<String> = HashSet::new();
 
     for route in &gtfs.routes {

src/main.rs

@@ -1,13 +1,15 @@
 mod gtfs;
 mod renderer;
-use std::{collections::HashSet, ops::Add, os::unix::process::ExitStatusExt, process, thread::Builder, time::SystemTime};
-use chrono::{DateTime, Duration, Local, NaiveTime, Timelike};
-use log::{Metadata, Record, debug, error, info};
+use std::{collections::HashSet, ops::Add, process, thread::Builder, time::SystemTime};
+use chrono::{DateTime, Duration, Local, NaiveTime};
+use log::{Metadata, Record, error, info};
 use sdl3::event::Event;
 use crate::{gtfs::structs::{Arrival, Gtfs}, renderer::structs::{DisplayData, DisplayEntry, Screen}};
 
 const SRC_FILE: &str = "/home/nahuel/Downloads/GTFS_Realtime.zip";
 const NUM_ARRIVALS: usize = 4;
+const UPDATE_INTERVAL_SECONDS: u64 = 62;
+
 
 // Custom Event to signal data refresh
 #[derive(Debug)] 
@@ -31,8 +33,6 @@ fn refresh_schedule<'a>(gtfs: &'a Gtfs, screen : &mut Screen<'a>) -> Option<Vec<
     next_arrivals.sort();
 
     // Create the DisplayData structure to render the information to screen
-    let now =Local::now();
-    let current_time: i64 =  (now.hour() * 3600 + now.minute() * 60 + now.second()).into();
     let mut display_data: DisplayData = DisplayData {
         lines: Vec::<DisplayEntry>::new(),
         status: None
@@ -46,7 +46,7 @@ fn refresh_schedule<'a>(gtfs: &'a Gtfs, screen : &mut Screen<'a>) -> Option<Vec<
                     .or(Option::Some(String::from("Unknown")
                 ))).unwrap(),
                 route: arrival.route.short_name.clone().or(arrival.route.long_name.clone()).unwrap(),
-                due_in: (arrival.departure_time - current_time) / 60,
+                departure_time: arrival.departure_time,
             }
         }));
 
@@ -117,7 +117,7 @@ fn main() {
         .name("updater".to_string())
         .spawn(move || { 
             loop {
-                std::thread::sleep(std::time::Duration::new(60,0));
+                std::thread::sleep(std::time::Duration::new(UPDATE_INTERVAL_SECONDS,0));
                 let event = RefreshDataEvent {};
                 let send_result = event_sender.push_custom_event(event);
                 if send_result.is_err() {

src/renderer/mod.rs

@@ -1,20 +1,17 @@
-
 pub mod structs;
 use std::cmp::min;
 
-use sdl3::{Sdl, pixels::Color, rect::Rect};
+use sdl3::{Sdl, pixels::Color, rect::Rect, ttf::FontStyle};
 use structs::{Prefs, DisplayData};
 
 use crate::renderer::structs::Screen;
 
-const LINE_COUNT: i32 = 6;
+const LINE_COUNT: i32 = 5;
 const COLOR_LCD_AMBER   : Color = Color::RGB(0xf4, 0xcb, 0x60);
 const COLOR_LCD_GREEN   : Color = Color::RGB(0xb3, 0xff, 0x00);
 const COLOR_LCD_RED     : Color = Color::RGB(0xff, 0x3a, 0x4a);
-
-//const COLOR_BACKGROUND = pygame.Color(0, 0, 0)
-const UPDATE_INTERVAL_SECONDS: u32 = 62;
-const TEXT_SIZE: u32 = 160;  // Size of the font in pixels
+const COLOR_BACKGROUND  : Color = Color::RGB(0x0,  0x0,  0x0 );
+const TEXT_SIZE: f32 = 160.0;  // Size of the font in pixels
 
 // Offsets of each part within a line
 const XOFFSET_ROUTE: u32 = 24;
@@ -22,7 +19,6 @@ const XOFFSET_DESTINATION: u32 = 300;
 const XOFFSEET_TIME_LEFT: u32 = 1606;
 const INTER_LINE_OVERLAP: u32 = 15; 
 
-
 impl Screen<'_> {
 
     pub fn get_context(&self) -> &Sdl {
@@ -35,25 +31,36 @@ impl Screen<'_> {
         return  COLOR_LCD_RED;
     }
 
+    fn format_due_for(&self, due_in: i32, departure_time: u32) -> String {
+        if due_in < 60 {
+            return String::from("due");
+        }
+        if due_in < 3600 {
+            return ((due_in / 60) as i32).to_string() + "min";
+        } 
+        return format!("{:02}:{:02}", (departure_time / 3600) as i32, ((departure_time % 3600) / 60) as i32);
+    }
+
 
     pub fn update_information(&mut self, display_data: &DisplayData) {
         self.do_clear();
 
         // TODO: Add header
 
-        let num_arrivals: i32 = min(if display_data.status.is_some() {LINE_COUNT - 1} else {LINE_COUNT}, display_data.lines.len().try_into().unwrap());
-        for line in 0..num_arrivals {
+        let num_arrivals: i32 = min(LINE_COUNT, display_data.lines.len() as i32);
+        for index in 0..num_arrivals {
+            let line: u32 = ((num_arrivals - 1) - index) as u32;
             // Compose a line of text with all the information 
             let entry = display_data.lines.get(line as usize).unwrap();
-            let line: u32 = (line + 1).try_into().unwrap();
-            let due_in_mins = entry.due_in as i32;
-            let arrival_color: Color = self.color_for(due_in_mins);
+            let due_in_mins = (entry.departure_time / 60) as i32;
+            let due_color: Color = self.color_for(due_in_mins);
+            let due_text = self.format_due_for(due_in_mins, entry.departure_time);
 
             self.color = COLOR_LCD_AMBER;
             self.do_print_at(line, &entry.route, XOFFSET_ROUTE);
             self.do_print_at(line, &entry.destination, XOFFSET_DESTINATION);
-            self.color = arrival_color;
-            self.do_print_at(line, &due_in_mins.to_string(), XOFFSEET_TIME_LEFT);
+            self.color = due_color;
+            self.do_print_at(line, &due_text, XOFFSEET_TIME_LEFT);
         };
 
         if display_data.status.is_some() {
@@ -63,14 +70,14 @@ impl Screen<'_> {
     }
 
 
-    pub fn print(&mut self, line: u32, text: &str) {
+    pub fn _print(&mut self, line: u32, text: &str) {
         self.do_print_at(line, text, 0);
         self.do_update();
     }
 
 
     fn do_print_at(&mut self, line: u32, text: &str, left: u32) -> u32 {
-        let rendered_text = self.font.render(text).solid(self.color).unwrap();
+        let rendered_text = self.font.render(text).lcd(self.color, COLOR_BACKGROUND).unwrap();
         let texture_creator = self.canvas.texture_creator();
         let texture = rendered_text.as_texture(&texture_creator).unwrap();
         let _= self.canvas.copy(&texture, 
@@ -92,7 +99,7 @@ impl Screen<'_> {
 
 
     fn do_clear(&mut self) {
-        self.canvas.set_draw_color(Color::BLACK);
+        self.canvas.set_draw_color(COLOR_BACKGROUND);
         self.canvas.clear();
     }
 
@@ -112,7 +119,7 @@ impl Screen<'_> {
 
         // Load font
         let ttf_context = sdl3::ttf::init().unwrap();
-        let font = ttf_context.load_font(&prefs.font_path, 128.0).unwrap();
+        let font = ttf_context.load_font(&prefs.font_path, TEXT_SIZE).unwrap();
         
         let mut screen: Screen = Screen {
             canvas:  Box::new(window.into_canvas()), 

src/renderer/structs.rs

@@ -18,7 +18,7 @@ pub struct Prefs {
 pub struct DisplayEntry {
     pub route: String,
     pub destination: String,
-    pub due_in: i64,
+    pub departure_time: u32,
 }
 
 pub struct DisplayData {