feat(discover): add exclusionary filters with per-dimension include/exclude toggles

docs/using-seerr/settings/general.md

@@ -40,6 +40,13 @@ Set the default display language for Seerr. Users can override this setting in t
 
 These settings filter content shown on the "Discover" home page based on regional availability and original language, respectively. The Streaming Region filters the available streaming providers on the media page. Users can override these global settings by configuring these same options in their user settings.
 
+The Discover page also exposes a filter panel where each dimension can be toggled between **Included** and **Excluded**:
+
+- **Included** narrows results to items matching the selected values (for example, only movies in Spanish, or only productions from Mexico).
+- **Excluded** removes items matching the selected values (for example, hiding Hindi-language movies or productions from India).
+
+Streaming services currently support inclusion only, as TMDB does not expose a user-facing exclusion parameter for watch providers.
+
 ## Blocklist Region and Blocklist Language
 
 These settings control the region and language used specifically for blocklist content scanning. The "Process Blocklisted Tags" job uses these settings to determine which content to scan for blocklisting, independent of the general Discover settings.

seerr-api.yml

@@ -5538,6 +5538,42 @@ paths:
             enum: [exact, range]
             example: exact
           description: Determines whether to use exact certification matching or a certification range (internal use only, not sent to TMDB API)
+        - in: query
+          name: excludeGenres
+          schema:
+            type: string
+            example: '27,53'
+          description: Comma-separated genre IDs to exclude
+        - in: query
+          name: excludeStudio
+          schema:
+            type: string
+            example: '1,2'
+          description: Comma-separated studio IDs to exclude
+        - in: query
+          name: excludeWatchProviders
+          schema:
+            type: string
+            example: '8|9'
+          description: Pipe-separated watch provider IDs to exclude
+        - in: query
+          name: country
+          schema:
+            type: string
+            example: 'US,GB'
+          description: Comma-separated ISO 3166-1 country codes
+        - in: query
+          name: excludeCountries
+          schema:
+            type: string
+            example: 'IN,CN'
+          description: Comma-separated ISO 3166-1 country codes to exclude
+        - in: query
+          name: excludeLanguages
+          schema:
+            type: string
+            example: 'en,fr'
+          description: Comma-separated ISO 639-1 language codes to exclude
       responses:
         '200':
           description: Results
@@ -5869,6 +5905,42 @@ paths:
             enum: [exact, range]
             example: exact
           description: Determines whether to use exact certification matching or a certification range (internal use only, not sent to TMDB API)
+        - in: query
+          name: excludeGenres
+          schema:
+            type: string
+            example: '27,53'
+          description: Comma-separated genre IDs to exclude
+        - in: query
+          name: excludeWatchProviders
+          schema:
+            type: string
+            example: '8|9'
+          description: Pipe-separated watch provider IDs to exclude
+        - in: query
+          name: country
+          schema:
+            type: string
+            example: 'US,GB'
+          description: Comma-separated ISO 3166-1 country codes
+        - in: query
+          name: excludeCountries
+          schema:
+            type: string
+            example: 'IN,CN'
+          description: Comma-separated ISO 3166-1 country codes to exclude
+        - in: query
+          name: excludeLanguages
+          schema:
+            type: string
+            example: 'en,fr'
+          description: Comma-separated ISO 639-1 language codes to exclude
+        - in: query
+          name: excludeStatus
+          schema:
+            type: string
+            example: '2,3'
+          description: Comma-separated status IDs to exclude
       responses:
         '200':
           description: Results

server/api/themoviedb/index.ts

@@ -95,6 +95,11 @@ interface DiscoverMovieOptions {
   certificationGte?: string;
   certificationLte?: string;
   certificationCountry?: string;
+  excludeGenres?: string;
+  excludeStudio?: string;
+  excludeWatchProviders?: string;
+  country?: string;
+  originCountryParam?: string;
 }
 
 interface DiscoverTvOptions {
@@ -122,6 +127,9 @@ interface DiscoverTvOptions {
   certificationGte?: string;
   certificationLte?: string;
   certificationCountry?: string;
+  excludeGenres?: string;
+  excludeWatchProviders?: string;
+  country?: string;
 }
 
 class TheMovieDb extends ExternalAPI implements TvShowProvider {
@@ -607,6 +615,11 @@ class TheMovieDb extends ExternalAPI implements TvShowProvider {
     certificationGte,
     certificationLte,
     certificationCountry,
+    excludeGenres,
+    excludeStudio,
+    excludeWatchProviders,
+    country,
+    originCountryParam,
   }: DiscoverMovieOptions = {}): Promise<TmdbSearchMovieResponse> => {
     try {
       const defaultFutureDate = new Date(
@@ -659,6 +672,10 @@ class TheMovieDb extends ExternalAPI implements TvShowProvider {
           'certification.gte': certificationGte,
           'certification.lte': certificationLte,
           certification_country: certificationCountry,
+          without_genres: excludeGenres,
+          without_companies: excludeStudio,
+          without_watch_providers: excludeWatchProviders,
+          with_origin_country: originCountryParam ?? country,
         },
       });
 
@@ -695,6 +712,9 @@ class TheMovieDb extends ExternalAPI implements TvShowProvider {
     certificationGte,
     certificationLte,
     certificationCountry,
+    excludeGenres,
+    excludeWatchProviders,
+    country,
   }: DiscoverTvOptions = {}): Promise<TmdbSearchTvResponse> => {
     try {
       const defaultFutureDate = new Date(
@@ -747,6 +767,9 @@ class TheMovieDb extends ExternalAPI implements TvShowProvider {
           'certification.gte': certificationGte,
           'certification.lte': certificationLte,
           certification_country: certificationCountry,
+          without_genres: excludeGenres,
+          without_watch_providers: excludeWatchProviders,
+          with_origin_country: country,
         },
       });
 

server/discover/countryCodes.ts

@@ -0,0 +1,24 @@
+import type TheMovieDb from '@server/api/themoviedb';
+
+/**
+ * Returns all ISO 3166-1 country codes. Reuses the existing `getRegions()`
+ * method which is already cached for 24 hours via nodeCache.
+ */
+export async function getAllCountryCodes(tmdb: TheMovieDb): Promise<string[]> {
+  const regions = await tmdb.getRegions();
+  return regions.map((r) => r.iso_3166_1).filter(Boolean);
+}
+
+/**
+ * Given the full set of codes and a subset to exclude, returns a pipe-joined
+ * string of everything EXCEPT the excluded codes. TMDB has no way to exclude
+ * an origin country directly, so we instead ask it to include the complement.
+ */
+export function buildComplement(allCodes: string[], exclude: string[]): string {
+  const excludeSet = new Set(exclude);
+  const result = allCodes.filter((c) => !excludeSet.has(c)).join('|');
+  if (result.length > 7500) {
+    throw new Error('Complement string exceeds safe URL length');
+  }
+  return result;
+}

server/discover/fill.ts

@@ -0,0 +1,73 @@
+import { PAGE_SIZE } from '@server/discover/planBuilder';
+import { applyPostFilter } from '@server/discover/postFilter';
+import type { HonestPage, ListResult, PostFilterSpec } from './types';
+
+interface TmdbPage<T> {
+  results: T[];
+  total_pages: number;
+  total_results: number;
+}
+
+/**
+ * Fetch TMDB discover pages and return a result whose pagination tells the
+ * truth about what the user will actually see.
+ *
+ * When no post-filter is active (common case), exactly one TMDB call is made
+ * and the response is honest.
+ *
+ * When a post-filter IS active (language exclude, TV country exclude), TMDB's
+ * total_results is a pre-filter count. To fill the requested page with real
+ * results we may need to over-fetch — up to `maxOverFetch` extra pages. This
+ * is a bounded trade of correctness for calls.
+ */
+export async function fillPage<T extends ListResult>(
+  fetch: (page: number) => Promise<TmdbPage<T>>,
+  postFilter: PostFilterSpec,
+  requestedPage: number,
+  maxOverFetch = 3
+): Promise<HonestPage<T>> {
+  const hasPostFilter =
+    !!postFilter.excludeLanguages?.length ||
+    !!postFilter.excludeCountries?.length;
+
+  if (!hasPostFilter) {
+    const res = await fetch(requestedPage);
+    return {
+      page: requestedPage,
+      totalPages: res.total_pages,
+      totalResults: res.total_results,
+      results: res.results,
+      paginationIsEstimate: false,
+    };
+  }
+
+  const collected: T[] = [];
+  let tmdbPage = requestedPage;
+  let extra = 0;
+  let lastTotalPages = 0;
+  let lastTotalResults = 0;
+  let anyDropped = false;
+
+  while (collected.length < PAGE_SIZE) {
+    const res = await fetch(tmdbPage);
+    lastTotalPages = res.total_pages;
+    lastTotalResults = res.total_results;
+
+    const { filtered, dropped } = applyPostFilter(res.results, postFilter);
+    if (dropped > 0) anyDropped = true;
+    collected.push(...filtered);
+
+    if (extra >= maxOverFetch) break;
+    if (tmdbPage >= res.total_pages) break;
+    tmdbPage++;
+    extra++;
+  }
+
+  return {
+    page: requestedPage,
+    totalPages: lastTotalPages,
+    totalResults: lastTotalResults,
+    results: collected.slice(0, PAGE_SIZE),
+    paginationIsEstimate: anyDropped,
+  };
+}