1 files changed, 133 insertions, 0 deletions
diff --git a/src/content/dependencies/listArtistsByGroup.js b/src/content/dependencies/listArtistsByGroup.js
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+++ b/src/content/dependencies/listArtistsByGroup.js
@@ -0,0 +1,133 @@
+import {sortAlphabetically} from '#sort';
+import {empty, filterMultipleArrays, stitchArrays, unique} from '#sugar';
+import {getArtistNumContributions} from '#wiki-data';
+
+export default {
+  contentDependencies: ['generateListingPage', 'linkArtist', 'linkGroup'],
+  extraDependencies: ['language', 'wikiData'],
+
+  sprawl({artistData, wikiInfo}) {
+    return {artistData, wikiInfo};
+  },
+
+  query(sprawl, spec) {
+    const artists =
+      sortAlphabetically(
+        sprawl.artistData.filter(artist => !artist.isAlias));
+
+    const groups =
+      sprawl.wikiInfo.divideTrackListsByGroups;
+
+    if (empty(groups)) {
+      return {spec, artists};
+    }
+
+    const artistGroups =
+      artists.map(artist =>
+        unique(
+          unique([
+            ...artist.albumsAsAny,
+            ...artist.tracksAsAny.map(track => track.album),
+          ]).flatMap(album => album.groups)))
+
+    const artistsByGroup =
+      groups.map(group =>
+        artists.filter((artist, index) => artistGroups[index].includes(group)));
+
+    filterMultipleArrays(groups, artistsByGroup,
+      (group, artists) => !empty(artists));
+
+    return {spec, groups, artistsByGroup};
+  },
+
+  relations(relation, query) {
+    const relations = {};
+
+    relations.page =
+      relation('generateListingPage', query.spec);
+
+    if (query.artists) {
+      relations.artistLinks =
+        query.artists
+          .map(artist => relation('linkArtist', artist));
+    }
+
+    if (query.artistsByGroup) {
+      relations.groupLinks =
+        query.groups
+          .map(group => relation('linkGroup', group));
+
+      relations.artistLinksByGroup =
+        query.artistsByGroup
+          .map(artists => artists
+            .map(artist => relation('linkArtist', artist)));
+    }
+
+    return relations;
+  },
+
+  data(query) {
+    const data = {};
+
+    if (query.artists) {
+      data.counts =
+        query.artists
+          .map(artist => getArtistNumContributions(artist));
+    }
+
+    if (query.artistsByGroup) {
+      data.groupDirectories =
+        query.groups
+          .map(group => group.directory);
+
+      data.countsByGroup =
+        query.artistsByGroup
+          .map(artists => artists
+            .map(artist => getArtistNumContributions(artist)));
+    }
+
+    return data;
+  },
+
+  generate(data, relations, {language}) {
+    return (
+      (relations.artistLinksByGroup
+        ? relations.page.slots({
+            type: 'chunks',
+
+            showSkipToSection: true,
+            chunkIDs:
+              data.groupDirectories
+                .map(directory => `contributed-to-${directory}`),
+
+            chunkTitles:
+              relations.groupLinks.map(groupLink => ({
+                group: groupLink,
+              })),
+
+            chunkRows:
+              stitchArrays({
+                artistLinks: relations.artistLinksByGroup,
+                counts: data.countsByGroup,
+              }).map(({artistLinks, counts}) =>
+                  stitchArrays({
+                    link: artistLinks,
+                    count: counts,
+                  }).map(({link, count}) => ({
+                      artist: link,
+                      contributions: language.countContributions(count, {unit: true}),
+                    }))),
+          })
+        : relations.page.slots({
+            type: 'rows',
+            rows:
+              stitchArrays({
+                link: relations.artistLinks,
+                count: data.counts,
+              }).map(({link, count}) => ({
+                  artist: link,
+                  contributions: language.countContributions(count, {unit: true}),
+                })),
+          })));
+  },
+};