fix: wired engines that exist to UI

crates/bds-core/src/engine/calendar.rs

@@ -0,0 +1,86 @@
+//! Calendar JSON generation — counts posts by year, month, day.
+
+use std::collections::BTreeMap;
+use std::path::Path;
+
+use rusqlite::Connection;
+
+use crate::db::queries::post as post_q;
+use crate::engine::EngineResult;
+use crate::model::PostStatus;
+use crate::util::{atomic_write, timestamp};
+
+/// Generate `html/calendar.json` from published posts.
+///
+/// The JSON has three top-level objects: `years`, `months`, `days`,
+/// each mapping a date key to a count of posts.
+pub fn regenerate_calendar(
+    conn: &Connection,
+    data_dir: &Path,
+    project_id: &str,
+) -> EngineResult<()> {
+    let posts = post_q::list_posts_by_project(conn, project_id)?;
+
+    let mut years: BTreeMap<String, u32> = BTreeMap::new();
+    let mut months: BTreeMap<String, u32> = BTreeMap::new();
+    let mut days: BTreeMap<String, u32> = BTreeMap::new();
+
+    for post in &posts {
+        if post.status != PostStatus::Published {
+            continue;
+        }
+        let ts = post.created_at;
+        let (y, m, d) = timestamp::year_month_day_from_unix_ms(ts);
+
+        let year_key = y.clone();
+        let month_key = format!("{y}-{m}");
+        let day_key = format!("{y}-{m}-{d}");
+
+        *years.entry(year_key).or_insert(0) += 1;
+        *months.entry(month_key).or_insert(0) += 1;
+        *days.entry(day_key).or_insert(0) += 1;
+    }
+
+    let calendar = serde_json::json!({
+        "years": years,
+        "months": months,
+        "days": days,
+    });
+
+    let html_dir = data_dir.join("html");
+    std::fs::create_dir_all(&html_dir)?;
+
+    let json_str = serde_json::to_string_pretty(&calendar)?;
+
+    atomic_write::atomic_write(&html_dir.join("calendar.json"), json_str.as_bytes())?;
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::db::Database;
+    use crate::engine;
+
+    #[test]
+    fn calendar_empty_project() {
+        let db = Database::open_in_memory().unwrap();
+        let _ = db.migrate();
+
+        let tmp = tempfile::tempdir().unwrap();
+        let p = engine::project::create_project(
+            db.conn(), "Test", Some(tmp.path().to_str().unwrap()),
+        ).unwrap();
+
+        regenerate_calendar(db.conn(), tmp.path(), &p.id).unwrap();
+
+        let cal_path = tmp.path().join("html").join("calendar.json");
+        assert!(cal_path.exists());
+
+        let data: serde_json::Value = serde_json::from_str(
+            &std::fs::read_to_string(&cal_path).unwrap()
+        ).unwrap();
+        assert!(data["years"].as_object().unwrap().is_empty());
+    }
+}