import { describe, expect, it } from 'vitest'
import type { MediaItem } from '@/composables/useMedia'
import { groupDuplicates, mergeArticleCount } from '../mediaDuplicates'

function copy(id: number, usedIn: number, createdAt: string, overrides: Partial<MediaItem> = {}) {
	return {
		id,
		filename: `copy-${id}.jpg`,
		url: `/media/copy-${id}.jpg`,
		size: 2516582,
		content_type: 'image/jpeg',
		width: 3600,
		height: 2400,
		sha256: 'aa',
		uploaded_by: 'Inès Duarte',
		created_at: createdAt,
		used_in: usedIn,
		duplicate: true,
		...overrides,
	} satisfies MediaItem
}

describe('groupDuplicates', () => {
	it.each([
		[
			'the most used copy',
			[
				copy(1, 4, '2026-06-14T12:00:00Z'),
				copy(2, 3, '2026-09-02T12:00:00Z'),
				copy(3, 2, '2026-08-30T12:00:00Z'),
			],
			1,
		],
		[
			'the oldest copy at equal use',
			[copy(1, 2, '2026-08-29T12:00:00Z'), copy(2, 2, '2026-08-21T12:00:00Z')],
			2,
		],
		[
			'the oldest unused copy',
			[copy(1, 0, '2026-09-03T12:00:00Z'), copy(2, 0, '2026-09-01T12:00:00Z')],
			2,
		],
		[
			'the lowest id at equal use and date',
			[copy(9, 1, '2026-09-03T12:00:00Z'), copy(4, 1, '2026-09-03T12:00:00Z')],
			4,
		],
	])('suggests %s', (_name, copies, suggestedId) => {
		const [group] = groupDuplicates(copies)

		expect(group!.suggested.id).toBe(suggestedId)
		expect(group!.copies[0]!.id).toBe(suggestedId)
	})

	it('groups by sha256, orders copies and puts the oldest suggested copy first', () => {
		const groups = groupDuplicates([
			copy(7, 2, '2026-08-29T12:00:00Z', { sha256: 'bb', size: 3250585 }),
			copy(5, 3, '2026-09-02T12:00:00Z'),
			copy(9, 1, '2026-08-21T12:00:00Z', { sha256: 'bb', size: 3250585 }),
			copy(12, 4, '2026-06-14T12:00:00Z'),
			copy(6, 2, '2026-08-30T12:00:00Z'),
		])

		expect(groups.map((group) => group.copies.map((item) => item.id))).toEqual([
			[12, 5, 6],
			[7, 9],
		])
		expect(groups.map((group) => group.header)).toEqual([
			'3 identical images · 2.4 MB each · 3600 × 2400',
			'2 identical images · 3.1 MB each · 3600 × 2400',
		])
	})

	it('reads Vector for SVG groups and ignores single copies', () => {
		const groups = groupDuplicates([
			copy(1, 0, '2026-09-01T12:00:00Z', { width: null, height: null, size: 8192 }),
			copy(2, 0, '2026-09-02T12:00:00Z', { width: null, height: null, size: 8192 }),
			copy(3, 0, '2026-09-02T12:00:00Z', { sha256: 'zz' }),
		])

		expect(groups).toHaveLength(1)
		expect(groups[0]!.header).toBe('2 identical images · 8 KB each · Vector')
	})
})

describe('mergeArticleCount', () => {
	it('sums the use of every copy except the kept one', () => {
		const copies = [
			copy(12, 4, '2026-06-14T12:00:00Z'),
			copy(5, 3, '2026-09-02T12:00:00Z'),
			copy(6, 2, '2026-08-30T12:00:00Z'),
		]

		expect(mergeArticleCount(copies, 12)).toBe(5)
		expect(mergeArticleCount(copies, 6)).toBe(7)
	})
})