Check to make sure new page read is after previous page read total

src/commands/LogReadingFinishedCommand.ts

@@ -56,7 +56,14 @@ export class LogReadingFinishedCommand extends EditorCheckCommand {
 			this.settings.spiceProperty !== ""
 		);
 
-		await this.readingLog.addEntry(fileName, pageCount, pageCount);
+		try {
+			await this.readingLog.addEntry(fileName, pageCount, pageCount);
+		} catch (error) {
+			new Notice(
+				`Failed to log reading progress for ${fileName}: ${error}`
+			);
+			return;
+		}
 
 		// @ts-expect-error Moment is provided by Obsidian
 		const endDate = moment().format("YYYY-MM-DD");

src/commands/LogReadingProgressCommand.ts

@@ -58,7 +58,15 @@ export class LogReadingProgressCommand extends EditorCheckCommand {
 			return;
 		}
 
-		await this.readingLog.addEntry(fileName, pageNumber, pageCount);
+		try {
+			await this.readingLog.addEntry(fileName, pageNumber, pageCount);
+		} catch (error) {
+			new Notice(
+				`Failed to log reading progress for ${fileName}: ${error}`
+			);
+			return;
+		}
+
 		new Notice(
 			`Logged reading progress for ${fileName}: Page ${pageNumber} of ${pageCount}.`
 		);

src/utils/ReadingLog.ts

@@ -44,7 +44,7 @@ export class ReadingLog {
 		return this.entries;
 	}
 
-	public getLatestEntry(book: string): ReadingLogEntry | null {
+	public getLastEntry(book: string): ReadingLogEntry | null {
 		const entriesForBook = this.entries.filter(
 			(entry) => entry.book === book
 		);
@@ -59,12 +59,18 @@ export class ReadingLog {
 		pageEnded: number,
 		pageCount: number
 	): Promise<void> {
-		const latestEntry = this.getLatestEntry(book);
+		const lastEntry = this.getLastEntry(book);
+
+		if (lastEntry && lastEntry.pagesReadTotal >= pageEnded) {
+			throw new Error(
+				"Given page ended is less than the previous entry's pages read total."
+			);
+		}
 
 		const newEntry: ReadingLogEntry = {
 			book,
-			pagesRead: latestEntry
+			pagesRead: lastEntry
-				? pageEnded - latestEntry.pagesReadTotal
+				? pageEnded - lastEntry.pagesReadTotal
 				: pageEnded,
 			pagesReadTotal: pageEnded,
 			pagesRemaining: pageCount - pageEnded,