1 files changed, 82 insertions, 0 deletions
diff --git a/src/content/dependencies/listTracksInFlashesByAlbum.js b/src/content/dependencies/listTracksInFlashesByAlbum.js
new file mode 100644
index 0000000..8ca0d99
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+++ b/src/content/dependencies/listTracksInFlashesByAlbum.js
@@ -0,0 +1,82 @@
+import {sortChronologically} from '#sort';
+import {empty, filterMultipleArrays, stitchArrays} from '#sugar';
+
+export default {
+  contentDependencies: ['generateListingPage', 'linkAlbum', 'linkFlash', 'linkTrack'],
+  extraDependencies: ['language', 'wikiData'],
+
+  sprawl({albumData}) {
+    return {albumData};
+  },
+
+  query({albumData}, spec) {
+    const albums = sortChronologically(albumData.slice());
+
+    const tracks =
+      albums.map(album =>
+        album.tracks.slice());
+
+    const flashes =
+      tracks.map(tracks =>
+        tracks.map(track =>
+          track.featuredInFlashes));
+
+    // Filter out tracks that aren't featured in any flashes.
+    // This listing doesn't perform any sorting within albums.
+    const stitched = stitchArrays({tracks, flashes});
+    for (const {tracks, flashes} of stitched) {
+      filterMultipleArrays(tracks, flashes,
+        (tracks, flashes) => !empty(flashes));
+    }
+
+    // Filter out albums which don't have at least one remaining track.
+    filterMultipleArrays(albums, tracks, flashes,
+      (album, tracks, _flashes) => !empty(tracks));
+
+    return {spec, albums, tracks, flashes};
+  },
+
+  relations(relation, query) {
+    return {
+      page: relation('generateListingPage', query.spec),
+
+      albumLinks:
+        query.albums
+          .map(album => relation('linkAlbum', album)),
+
+      trackLinks:
+        query.tracks
+          .map(tracks => tracks
+            .map(track => relation('linkTrack', track))),
+
+      flashLinks:
+        query.flashes
+          .map(flashesByAlbum => flashesByAlbum
+            .map(flashesByTrack => flashesByTrack
+              .map(flash => relation('linkFlash', flash)))),
+    };
+  },
+
+  generate(relations, {language}) {
+    return relations.page.slots({
+      type: 'chunks',
+
+      chunkTitles:
+        relations.albumLinks
+          .map(albumLink => ({album: albumLink})),
+
+      chunkRows:
+        stitchArrays({
+          trackLinks: relations.trackLinks,
+          flashLinks: relations.flashLinks,
+        }).map(({trackLinks, flashLinks}) =>
+            stitchArrays({
+              trackLink: trackLinks,
+              flashLinks: flashLinks,
+            }).map(({trackLink, flashLinks}) => ({
+                track: trackLink,
+                flashes: language.formatConjunctionList(flashLinks),
+              }))),
+    });
+  },
+};