import { afterEach, describe, expect, it, vi } from 'vitest'
import { hashFile } from '../fileHash'

const SHA256_OF_ABC = 'ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad'

function fileOf(bytes: number[]) {
	return new File([new Uint8Array(bytes)], 'a.png', { type: 'image/png' })
}

afterEach(() => {
	vi.unstubAllGlobals()
})

describe('hashFile', () => {
	it('resolves the lowercase 64-character hex of the digest', async () => {
		const digest = vi.fn(async (_algorithm: string, data: ArrayBuffer) => {
			expect(Array.from(new Uint8Array(data))).toEqual([97, 98, 99])
			return new Uint8Array(
				SHA256_OF_ABC.match(/../g)!.map((pair) => Number.parseInt(pair, 16)),
			).buffer
		})
		vi.stubGlobal('crypto', { subtle: { digest } })

		const hex = await hashFile(fileOf([97, 98, 99]))

		expect(digest).toHaveBeenCalledWith('SHA-256', expect.anything())
		expect(hex).toBe(SHA256_OF_ABC)
		expect(hex).toMatch(/^[0-9a-f]{64}$/)
	})

	it('resolves null when crypto.subtle is unavailable', async () => {
		vi.stubGlobal('crypto', { subtle: undefined })

		expect(await hashFile(fileOf([1]))).toBeNull()
	})

	it('resolves null when the digest rejects', async () => {
		vi.stubGlobal('crypto', { subtle: { digest: vi.fn().mockRejectedValue(new Error('no')) } })

		expect(await hashFile(fileOf([1]))).toBeNull()
	})

	it('imports nothing from the Media page', async () => {
		const source = (await import('../fileHash?raw')).default
		expect(source).not.toMatch(/import .*Media/)
		expect(source).not.toMatch(/from '@\/(components|views|composables)/)
	})
})