Average of tickets submitted per weekday

Avvailable in the diagnostics

frontend/src/pages/utilities.rs

@@ -1,15 +1,85 @@
+use chrono::{DateTime, Datelike, Utc};
 use gloo_net::http::Request;
+use serde::Deserialize;
 use wasm_bindgen_futures::spawn_local;
 use yew::prelude::*;
-use yew_router::prelude::*;
 
 use crate::pages::ticket::{ActiveUser, Ticket};
 
+#[derive(Debug, Deserialize, Clone)]
+struct Date {
+    date: DateTime<Utc>, // matches JSON "date": "2026-05-01T14:23:00Z"
+}
+
+fn weekday_index(dt: &DateTime<Utc>) -> usize {
+    // chrono::Weekday: Mon = 1 ... Sun = 7
+    match dt.weekday() {
+        chrono::Weekday::Mon => 0,
+        chrono::Weekday::Tue => 1,
+        chrono::Weekday::Wed => 2,
+        chrono::Weekday::Thu => 3,
+        chrono::Weekday::Fri => 4,
+        chrono::Weekday::Sat => 5,
+        chrono::Weekday::Sun => 6,
+    }
+}
+
+fn count_by_weekday(tickets: &[Date]) -> [usize; 7] {
+    let mut counts = [0usize; 7];
+    for t in tickets {
+        counts[weekday_index(&t.date)] += 1;
+    }
+    counts
+}
+
+fn day_counts(dates: &[Date]) -> [usize; 7] {
+    if dates.is_empty() {
+        return [0usize; 7];
+    }
+
+    let mut min = dates[0].date.date_naive();
+    let mut max = min;
+    for d in dates.iter().skip(1) {
+        let dt = d.date.date_naive();
+        if dt < min {
+            min = dt
+        }
+        if dt > max {
+            max = dt
+        }
+    }
+
+    let total_days = (max - min).num_days() + 1;
+    if total_days <= 0 {
+        return [0usize; 7];
+    }
+
+    let mut occ = [0usize; 7];
+    let mut current = min;
+    for _ in 0..total_days {
+        let wd = current.weekday();
+        let idx = match wd {
+            chrono::Weekday::Mon => 0,
+            chrono::Weekday::Tue => 1,
+            chrono::Weekday::Wed => 2,
+            chrono::Weekday::Thu => 3,
+            chrono::Weekday::Fri => 4,
+            chrono::Weekday::Sat => 5,
+            chrono::Weekday::Sun => 6,
+        };
+        occ[idx] += 1;
+        current = current.succ();
+    }
+
+    occ
+}
+
 #[component(Diagnostics)]
 pub fn diagnostics_component() -> Html {
     html! {
         <div>
             <TicketCount/>
+            <SubmitStats/>
         </div>
     }
 }
@@ -108,5 +178,83 @@ pub fn ticket_count_component() -> Html {
     }
 }
 
-// #[component(SubmitStats)]
-// pub fn submit_stats_component() -> Html {}
+#[component(SubmitStats)]
+pub fn submit_stats_component() -> Html {
+    let tickets = use_state(|| Vec::<Date>::new());
+    let error = use_state(|| None::<String>);
+    let loading = use_state(|| false);
+
+    {
+        let tickets = tickets.clone();
+        let error = error.clone();
+        let loading = loading.clone();
+
+        use_effect_with((), move |_| {
+            loading.set(true);
+            spawn_local(async move {
+                let url = "/api/tickets".to_string();
+                match Request::get(&url).send().await {
+                    Ok(response) if response.status() == 200 => {
+                        match response.json::<Vec<Date>>().await {
+                            Ok(t) => tickets.set(t),
+                            Err(e) => error.set(Some(format!("parse error: {}", e))),
+                        }
+                    }
+                    Ok(response) => {
+                        if let Ok(text) = response.text().await {
+                            error.set(Some(text));
+                        } else {
+                            error.set(Some(format!("status {}", response.status())));
+                        }
+                    }
+                    Err(err) => error.set(Some(format!("Network error: {}", err))),
+                }
+                loading.set(false);
+            });
+            || ()
+        });
+    }
+
+    let counts = count_by_weekday(&tickets);
+    let occ = day_counts(&tickets);
+
+    let mut avg = [0.0f64; 7];
+    for i in 0..7 {
+        if occ[i] > 0 {
+            avg[i] = counts[i] as f64 / occ[i] as f64;
+        } else {
+            avg[i] = 0.0;
+        }
+    }
+
+    let weekdays = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];
+    let (max_idx, _max_val) = counts
+        .iter()
+        .enumerate()
+        .max_by(|a, b| a.1.partial_cmp(b.1).unwrap())
+        .map(|(i, _)| (i, ()))
+        .unwrap_or((0, ()));
+
+    html! {
+        <div>
+            if *loading {
+                <p>{ "Loading..." }</p>
+            }
+            if let Some(e) = &*error {
+                <p style="color: red;">{ e.clone() }</p>
+            }
+            <h3>{ "Tickets per weekday" }</h3>
+            <ul>
+                { for (0..7).map(|i| {
+                    let is_max = i == max_idx;
+                    html! {
+                        <li style={ if is_max { "font-weight: bold; color: green;" } else { "" } }>
+                            { format!("{}: {:3}", weekdays[i], avg[i]) }
+                            { if is_max { html!{ <span>{ " ← most" }</span> } } else { html!{} } }
+                        </li>
+                    }
+                })}
+            </ul>
+        </div>
+    }
+}