fix(stats): stop counting duplicate typeset subtitle lines (#191)

src/cli/args.test.ts

@@ -399,6 +399,30 @@ test('hasExplicitCommand and shouldStartApp preserve command intent', () => {
   assert.equal(statsLifetimeRebuild.statsCleanupLifetime, true);
   assert.equal(statsLifetimeRebuild.statsCleanupVocab, false);
 
+  assert.throws(
+    () =>
+      parseArgs([
+        '--stats',
+        '--stats-cleanup',
+        '--stats-cleanup-duplicate-lines',
+        '--stats-cleanup-lookback-days',
+        '0.5',
+      ]),
+    /at least one day/,
+  );
+  assert.equal(
+    parseArgs([
+      '--stats',
+      '--stats-cleanup',
+      '--stats-cleanup-duplicate-lines',
+      '--stats-cleanup-lookback-days',
+      '1.5',
+    ]).statsCleanupLookbackDays,
+    1,
+  );
+  assert.equal(parseArgs(['--stats-cleanup-lookback-days=30']).statsCleanupLookbackDays, 30);
+  assert.throws(() => parseArgs(['--stats-cleanup-lookback-days=30=oops']), /at least one day/);
+
   const jellyfinLibraries = parseArgs(['--jellyfin-libraries']);
   assert.equal(jellyfinLibraries.jellyfinLibraries, true);
   assert.equal(hasExplicitCommand(jellyfinLibraries), true);

src/cli/args.ts

@@ -64,6 +64,9 @@ export interface CliArgs {
   statsCleanup?: boolean;
   statsCleanupVocab?: boolean;
   statsCleanupLifetime?: boolean;
+  statsCleanupDuplicateLines?: boolean;
+  statsCleanupDryRun?: boolean;
+  statsCleanupLookbackDays?: number;
   statsResponsePath?: string;
   jellyfin: boolean;
   jellyfinLogin: boolean;
@@ -109,6 +112,14 @@ export interface CliArgs {
 
 export type CliCommandSource = 'initial' | 'second-instance';
 
+function parseStatsCleanupLookbackDays(value: string | undefined): number {
+  const days = Number(value);
+  if (!Number.isFinite(days) || days < 1) {
+    throw new Error('Stats --lookback-days must be at least one day.');
+  }
+  return Math.floor(days);
+}
+
 export function parseArgs(argv: string[]): CliArgs {
   const args: CliArgs = {
     background: false,
@@ -167,6 +178,8 @@ export function parseArgs(argv: string[]): CliArgs {
     statsCleanup: false,
     statsCleanupVocab: false,
     statsCleanupLifetime: false,
+    statsCleanupDuplicateLines: false,
+    statsCleanupDryRun: false,
     jellyfin: false,
     jellyfinLogin: false,
     jellyfinLogout: false,
@@ -368,7 +381,15 @@ export function parseArgs(argv: string[]): CliArgs {
     } else if (arg === '--stats-cleanup') args.statsCleanup = true;
     else if (arg === '--stats-cleanup-vocab') args.statsCleanupVocab = true;
     else if (arg === '--stats-cleanup-lifetime') args.statsCleanupLifetime = true;
-    else if (arg.startsWith('--stats-response-path=')) {
+    else if (arg === '--stats-cleanup-duplicate-lines') args.statsCleanupDuplicateLines = true;
+    else if (arg === '--stats-cleanup-dry-run') args.statsCleanupDryRun = true;
+    else if (arg.startsWith('--stats-cleanup-lookback-days=')) {
+      args.statsCleanupLookbackDays = parseStatsCleanupLookbackDays(
+        arg.slice('--stats-cleanup-lookback-days='.length),
+      );
+    } else if (arg === '--stats-cleanup-lookback-days') {
+      args.statsCleanupLookbackDays = parseStatsCleanupLookbackDays(readValue(argv[i + 1]));
+    } else if (arg.startsWith('--stats-response-path=')) {
       const value = arg.split('=', 2)[1];
       if (value) args.statsResponsePath = value;
     } else if (arg === '--stats-response-path') {