// @ts-expect-error -- bun:test is a runtime built-in with no types installed
import { describe, test, expect, beforeAll, afterAll } from 'bun:test';
import { mkdtempSync, writeFileSync, readFileSync, existsSync, utimesSync, statSync, rmSync } from 'fs';
import { tmpdir } from 'os';
import { join } from 'path';
import {
	isValidSelfhstRef,
	selfhstCachePath,
	sanitizeSvg,
	getSelfhstIcon
} from '../src/lib/server/selfhst-icons';
import { looksLikeImage } from '../src/lib/server/stack-icons';

describe('isValidSelfhstRef', () => {
	test('accepts normal references', () => {
		for (const r of ['plex', 'jellyfin', 'home-assistant', 'pihole', 'nextcloud', '2fauth']) {
			expect(isValidSelfhstRef(r)).toBe(true);
		}
	});

	test('rejects path traversal and junk', () => {
		for (const r of ['../etc/passwd', 'a/b', 'foo.svg', 'Foo', 'a_b', 'a b', '', '..', './x', 'x/../y']) {
			expect(isValidSelfhstRef(r)).toBe(false);
		}
	});

	test('rejects an over-long ref', () => {
		expect(isValidSelfhstRef('a'.repeat(65))).toBe(false);
	});

	test('selfhstCachePath throws on an invalid ref (never builds a path from junk)', () => {
		expect(() => selfhstCachePath('../../etc/passwd')).toThrow();
		expect(() => selfhstCachePath('ok-ref')).not.toThrow();
	});

	test('selfhstCachePath keeps the ref inside the cache dir', () => {
		const p = selfhstCachePath('plex');
		expect(p.endsWith('/icon-cache/selfhst/plex.svg')).toBe(true);
	});
});

describe('sanitizeSvg (SVG-XSS defense)', () => {
	test('strips <script> elements', () => {
		const out = sanitizeSvg('<svg><script>alert(document.cookie)</script><rect/></svg>');
		expect(out).not.toContain('<script');
		expect(out).toContain('<rect');
	});

	test('strips on* event-handler attributes', () => {
		const out = sanitizeSvg('<svg onload="evil()"><rect onclick=\'x\'/></svg>');
		expect(out).not.toMatch(/onload/i);
		expect(out).not.toMatch(/onclick/i);
	});

	test('strips <foreignObject> (can embed HTML)', () => {
		const out = sanitizeSvg('<svg><foreignObject><body onload="x"/></foreignObject></svg>');
		expect(out).not.toMatch(/foreignObject/i);
	});

	test('strips javascript: URLs', () => {
		const out = sanitizeSvg('<svg><a href="javascript:alert(1)">x</a></svg>');
		expect(out.toLowerCase()).not.toContain('javascript:');
	});

	test('leaves a clean logo SVG intact', () => {
		const clean = '<svg viewBox="0 0 24 24"><path d="M1 1h2v2z" fill="#fff"/></svg>';
		expect(sanitizeSvg(clean)).toBe(clean);
	});
});

describe('looksLikeImage (upload magic-byte check)', () => {
	test('accepts real image magic bytes', () => {
		expect(looksLikeImage(Buffer.from([0x89, 0x50, 0x4e, 0x47, 0, 0]))).toBe(true); // PNG
		expect(looksLikeImage(Buffer.from([0xff, 0xd8, 0xff, 0xe0]))).toBe(true); // JPEG
		expect(looksLikeImage(Buffer.from('GIF89a'))).toBe(true);
		expect(looksLikeImage(Buffer.from('RIFF\0\0\0\0WEBP'))).toBe(true);
		expect(looksLikeImage(Buffer.from('<svg></svg>'))).toBe(true);
	});

	test('rejects arbitrary / non-image bytes', () => {
		expect(looksLikeImage(Buffer.from('#!/bin/sh\nrm -rf /'))).toBe(false);
		expect(looksLikeImage(Buffer.from([0x00, 0x01, 0x02, 0x03]))).toBe(false);
		expect(looksLikeImage(Buffer.from('MZ\x90\x00'))).toBe(false); // PE/exe
		expect(looksLikeImage(Buffer.alloc(0))).toBe(false);
	});
});

// getSelfhstIcon's cache-HIT paths are deterministic (no network). We seed the on-disk
// cache under a temp DATA_DIR and assert what the cache read returns without ever
// reaching the CDN. Stale/corrupt entries fall through to a fetch, which fails offline
// and returns null - that null still proves the bad file was NOT served.
describe('getSelfhstIcon cache-hit handling', () => {
	let dir: string;
	beforeAll(() => {
		dir = mkdtempSync(join(tmpdir(), 'selfhst-cache-'));
		process.env.DATA_DIR = dir;
	});
	afterAll(() => {
		delete process.env.DATA_DIR;
		rmSync(dir, { recursive: true, force: true });
	});

	test('serves a valid cached SVG without refetching', async () => {
		const p = selfhstCachePath('plex');
		writeFileSync(p, '<svg>ok</svg>');
		const buf = await getSelfhstIcon('plex');
		expect(buf?.toString()).toBe('<svg>ok</svg>');
	});

	test('a fresh zero-byte tombstone returns null (no refetch)', async () => {
		const p = selfhstCachePath('jellyfin');
		writeFileSync(p, Buffer.alloc(0)); // mtime = now -> within TTL
		expect(await getSelfhstIcon('jellyfin')).toBeNull();
		expect(existsSync(p)).toBe(true); // tombstone kept
	});

	// A ref that can NEVER exist upstream (valid syntactically, but no such icon) so the
	// fall-through fetch deterministically returns a 404/miss regardless of network.
	const MISSING = 'zzz-nonexistent-test-icon';

	test('a corrupt (nonzero non-SVG) cache file is never served (dropped, refetched)', async () => {
		const p = selfhstCachePath(MISSING);
		writeFileSync(p, Buffer.from([0x00, 0x01, 0x02])); // binary, no leading '<'
		const buf = await getSelfhstIcon(MISSING);
		// Whatever happens, the corrupt bytes are NOT returned. Offline/404 -> null; the file
		// is either gone or replaced by a 0-byte tombstone, never the original garbage.
		expect(buf).toBeNull();
		if (existsSync(p)) {
			expect(readFileSync(p).length).toBe(0); // tombstone, not the corrupt content
		}
	});

	test('a stale tombstone (older than the TTL) is not treated as a live miss', async () => {
		const p = selfhstCachePath(MISSING);
		writeFileSync(p, Buffer.alloc(0));
		const old = Date.now() / 1000 - 3 * 24 * 60 * 60; // 3 days ago (TTL is 1 day)
		utimesSync(p, old, old);
		const before = statSync(p).mtimeMs;
		await getSelfhstIcon(MISSING); // stale -> refetch (misses) -> fresh tombstone
		// The stale tombstone was acted on (dropped then rewritten), i.e. its mtime advanced -
		// proving it was NOT returned as a still-valid negative-cache hit.
		if (existsSync(p)) expect(statSync(p).mtimeMs).toBeGreaterThan(before);
	});
});