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import {empty, stitchArrays} from '#sugar';
function groupTracksByGroup(tracks, groups) {
const lists = new Map(groups.map(group => [group, []]));
lists.set('other', []);
for (const track of tracks) {
const group = groups.find(group => group.albums.includes(track.album));
if (group) {
lists.get(group).push(track);
} else {
lists.get('other').push(track);
}
}
for (const [key, tracks] of lists.entries()) {
if (empty(tracks)) {
lists.delete(key);
}
}
return lists;
}
export default {
contentDependencies: [
'generateContentHeading',
'generateTrackList',
'linkGroup',
],
extraDependencies: ['html', 'language'],
query: (tracks, groups) => ({
lists:
(empty(groups)
? []
: groupTracksByGroup(tracks, groups)),
}),
relations(relation, query, tracks, groups) {
if (empty(tracks)) {
return {};
}
if (empty(groups)) {
return {
flatList:
relation('generateTrackList', tracks),
};
}
return {
contentHeading:
relation('generateContentHeading'),
groupedLists:
Array.from(query.lists.entries())
.map(([groupOrOther, tracks]) => ({
...(groupOrOther === 'other'
? {other: true}
: {groupLink: relation('linkGroup', groupOrOther)}),
list:
relation('generateTrackList', tracks),
})),
};
},
data: (query) => ({
groupNames:
Array.from(query.lists.keys())
.map(groupOrOther =>
(groupOrOther === 'group'
? null
: groupOrOther.name)),
}),
slots: {
headingString: {
type: 'string',
},
},
generate(data, relations, slots, {html, language}) {
if (relations.flatList) {
return relations.flatList;
}
return html.tag('dl',
stitchArrays({
groupName: data.groupNames,
listEntry: relations.groupedLists
}).map(({
groupName,
listEntry: {other, groupLink, list},
}) => [
(slots.headingString
? relations.contentHeading.clone().slots({
tag: 'dt',
title:
(other
? language.$('trackList.fromOther')
: language.$('trackList.fromGroup', {
group: groupLink
})),
stickyTitle:
(other
? language.$(slots.headingString, 'sticky', 'fromOther')
: language.$(slots.headingString, 'sticky', 'fromGroup', {
group: groupName,
})),
})
: html.tag('dt',
(other
? language.$('trackList.fromOther')
: language.$('trackList.fromGroup', {
group: groupLink
})))),
html.tag('dd', list),
]));
},
};
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