feat: media page T1

web/src/lib/mediaDuplicates.ts

@@ -0,0 +1,42 @@
+import type { MediaItem } from '@/composables/useMedia'
+import { formatDimensions, formatSize } from '@/lib/mediaFormat'
+
+export interface DuplicateGroup {
+	hash: string
+	copies: MediaItem[]
+	suggested: MediaItem
+	header: string
+}
+
+function byAge(first: MediaItem, second: MediaItem) {
+	return Date.parse(first.created_at) - Date.parse(second.created_at) || first.id - second.id
+}
+
+function byPreference(first: MediaItem, second: MediaItem) {
+	return second.used_in - first.used_in || byAge(first, second)
+}
+
+export function groupHeader(copies: MediaItem[]) {
+	const [first] = copies
+	return `${copies.length} identical images · ${formatSize(first!.size)} each · ${formatDimensions(first!.width, first!.height)}`
+}
+
+export function groupDuplicates(items: MediaItem[]): DuplicateGroup[] {
+	const byHash = new Map<string, MediaItem[]>()
+	for (const item of items) {
+		byHash.set(item.sha256, [...(byHash.get(item.sha256) ?? []), item])
+	}
+	return [...byHash.entries()]
+		.filter(([, copies]) => copies.length > 1)
+		.map(([hash, copies]) => {
+			const sorted = [...copies].sort(byPreference)
+			return { hash, copies: sorted, suggested: sorted[0]!, header: groupHeader(sorted) }
+		})
+		.sort((first, second) => byAge(first.suggested, second.suggested))
+}
+
+export function mergeArticleCount(copies: MediaItem[], keepId: number) {
+	return copies
+		.filter((copy) => copy.id !== keepId)
+		.reduce((total, copy) => total + copy.used_in, 0)
+}