From efd45cf61ef2d730a17382e33af01f6f44808a09 Mon Sep 17 00:00:00 2001
From: PJ <ipriyanshujain@gmail.com>
Date: Mon, 10 Aug 2026 18:36:30 +0530
Subject: [PATCH] feat(library): show last edited time on book cards

---
 src-tauri/src/library.rs   | 34 +++++++++++++++++++++++++++++++++-
 src/components/Library.tsx |  7 +++++++
 src/components/Sidebar.tsx | 23 ++---------------------
 src/library.ts             |  1 +
 src/styles/app.css         | 13 +++++++++++++
 src/time.ts                | 19 +++++++++++++++++++
 6 files changed, 75 insertions(+), 22 deletions(-)
 create mode 100644 src/time.ts

diff --git a/src-tauri/src/library.rs b/src-tauri/src/library.rs
index e44602c..44db948 100644
--- a/src-tauri/src/library.rs
+++ b/src-tauri/src/library.rs
@@ -1,13 +1,16 @@
 use std::fs;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
+use std::time::UNIX_EPOCH;
 use tauri::Manager;
 
 #[derive(serde::Serialize)]
+#[serde(rename_all = "camelCase")]
 pub struct BookSummary {
     id: String,
     title: String,
     author: String,
     corrupt: bool,
+    updated_at: u64,
 }
 
 fn corrupt_summary(stem: &str) -> BookSummary {
@@ -16,9 +19,33 @@ fn corrupt_summary(stem: &str) -> BookSummary {
         title: "Unreadable book".to_string(),
         author: String::new(),
         corrupt: true,
+        updated_at: 0,
     }
 }
 
+fn file_modified_ms(path: &Path) -> u64 {
+    fs::metadata(path)
+        .and_then(|m| m.modified())
+        .ok()
+        .and_then(|t| t.duration_since(UNIX_EPOCH).ok())
+        .map(|d| d.as_millis() as u64)
+        .unwrap_or(0)
+}
+
+fn latest_chapter_ms(value: &serde_json::Value) -> u64 {
+    value
+        .get("chapters")
+        .and_then(|c| c.as_array())
+        .map(|chapters| {
+            chapters
+                .iter()
+                .filter_map(|c| c.get("updatedAt").and_then(|v| v.as_u64()))
+                .max()
+                .unwrap_or(0)
+        })
+        .unwrap_or(0)
+}
+
 pub(crate) fn app_data_dir(app: &tauri::AppHandle) -> Result<PathBuf, String> {
     let dir = app.path().app_data_dir().map_err(|e| e.to_string())?;
     fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
@@ -81,11 +108,16 @@ pub fn list_books(app: tauri::AppHandle) -> Result<Vec<BookSummary>, String> {
             .and_then(|v| v.as_str())
             .unwrap_or("")
             .to_string();
+        let updated_at = match latest_chapter_ms(&value) {
+            0 => file_modified_ms(&path),
+            ms => ms,
+        };
         books.push(BookSummary {
             id: id.to_string(),
             title,
             author,
             corrupt: false,
+            updated_at,
         });
     }
     Ok(books)
diff --git a/src/components/Library.tsx b/src/components/Library.tsx
index abe8177..dac5c4d 100644
--- a/src/components/Library.tsx
+++ b/src/components/Library.tsx
@@ -10,10 +10,12 @@ import { RowMenu } from "./RowMenu";
 import { BackupButton } from "./BackupButton";
 import { useBackup } from "../store/useBackup";
 import { useBook } from "../store/useBook";
+import { relativeTime } from "../time";
 
 export function Library({ onOpen }: { onOpen: (book: Book) => void }) {
   const [books, setBooks] = useState<BookSummary[]>([]);
   const [loaded, setLoaded] = useState(false);
+  const [now, setNow] = useState(() => Date.now());
   const [busy, setBusy] = useState(false);
   const [pendingDelete, setPendingDelete] = useState<BookSummary | null>(null);
   const notice = useBook((s) => s.notice);
@@ -30,6 +32,10 @@ export function Library({ onOpen }: { onOpen: (book: Book) => void }) {
   useEffect(() => {
     refresh();
   }, []);
+  useEffect(() => {
+    const timer = setInterval(() => setNow(Date.now()), 60_000);
+    return () => clearInterval(timer);
+  }, []);
   useEffect(() => {
     if (restoreNonce) refresh();
   }, [restoreNonce]);
@@ -125,6 +131,7 @@ export function Library({ onOpen }: { onOpen: (book: Book) => void }) {
             >
               <span className="card-title">{b.title || "Untitled"}</span>
               {b.author && <span className="card-author">{b.author}</span>}
+              {b.updatedAt > 0 && <span className="card-meta">Edited {relativeTime(b.updatedAt, now)}</span>}
               <RowMenu label="Book options" className="card-menu" onDelete={() => setPendingDelete(b)} />
             </div>
           ),
diff --git a/src/components/Sidebar.tsx b/src/components/Sidebar.tsx
index 65b4677..dcb174d 100644
--- a/src/components/Sidebar.tsx
+++ b/src/components/Sidebar.tsx
@@ -5,6 +5,7 @@ import { AddPageMenu } from "./AddPageMenu";
 import { ConfirmDialog } from "./ConfirmDialog";
 import { Icon } from "./Icon";
 import { RowMenu } from "./RowMenu";
+import { relativeTime } from "../time";
 
 interface Row {
   chapter: Chapter;
@@ -19,26 +20,6 @@ interface DropTarget {
   index: number;
 }
 
-function formatEdited(ts: number, now: number): string {
-  const diff = Math.max(0, now - ts);
-  const min = 60_000;
-  const hour = 60 * min;
-  const day = 24 * hour;
-  if (diff < min) return "just now";
-  if (diff < hour) {
-    const m = Math.floor(diff / min);
-    return `${m} minute${m === 1 ? "" : "s"} ago`;
-  }
-  if (diff < day) {
-    const h = Math.floor(diff / hour);
-    return `${h} hour${h === 1 ? "" : "s"} ago`;
-  }
-  if (diff < 2 * day) return "yesterday";
-  const d = Math.floor(diff / day);
-  if (d < 7) return `${d} days ago`;
-  return new Date(ts).toLocaleDateString(undefined, { month: "short", day: "numeric", year: "numeric" });
-}
-
 export function Sidebar({ onNavigate }: { onNavigate?: () => void }) {
   const chapters = useBook((s) => s.book?.chapters ?? []);
   const activeChapterId = useBook((s) => s.activeChapterId);
@@ -254,7 +235,7 @@ export function Sidebar({ onNavigate }: { onNavigate?: () => void }) {
                         </span>
                       )}
                       {row.chapter.id === activeChapterId && (
-                        <span className="meta">Edited {formatEdited(row.chapter.updatedAt, now)}</span>
+                        <span className="meta">Edited {relativeTime(row.chapter.updatedAt, now)}</span>
                       )}
                     </span>
                     <RowMenu
diff --git a/src/library.ts b/src/library.ts
index e3a145e..6c7e521 100644
--- a/src/library.ts
+++ b/src/library.ts
@@ -6,6 +6,7 @@ export interface BookSummary {
   id: string;
   title: string;
   author: string;
+  updatedAt: number;
   corrupt?: boolean;
 }
 
diff --git a/src/styles/app.css b/src/styles/app.css
index cea5e82..030071e 100644
--- a/src/styles/app.css
+++ b/src/styles/app.css
@@ -1566,6 +1566,19 @@ body.resizing .sidebar {
   color: var(--accent);
 }
 
+.card-meta {
+  position: absolute;
+  left: 14px;
+  right: 14px;
+  bottom: 14px;
+  font-family: var(--font-ui);
+  font-size: var(--t-1);
+  color: var(--ink-faint);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
 .card-action {
   background: transparent;
   border: 1px dashed var(--line-strong);
diff --git a/src/time.ts b/src/time.ts
new file mode 100644
index 0000000..d2f460f
--- /dev/null
+++ b/src/time.ts
@@ -0,0 +1,19 @@
+export function relativeTime(ts: number, now: number): string {
+  const diff = Math.max(0, now - ts);
+  const min = 60_000;
+  const hour = 60 * min;
+  const day = 24 * hour;
+  if (diff < min) return "just now";
+  if (diff < hour) {
+    const m = Math.floor(diff / min);
+    return `${m} minute${m === 1 ? "" : "s"} ago`;
+  }
+  if (diff < day) {
+    const h = Math.floor(diff / hour);
+    return `${h} hour${h === 1 ? "" : "s"} ago`;
+  }
+  if (diff < 2 * day) return "yesterday";
+  const d = Math.floor(diff / day);
+  if (d < 7) return `${d} days ago`;
+  return new Date(ts).toLocaleDateString(undefined, { month: "short", day: "numeric", year: "numeric" });
+}