// Phase 3 — download stream actions (#163): server-push multi-frame.
import { describe, it, expect, afterEach } from 'vitest';
import fs from 'fs';
import path from 'path';
import { ApiHandler, type ApiActionContext } from '../src/api-handler';
import { __test } from '../src/actions/stream-download';
import { STREAM_DOWNLOAD_DIR, __test as fileTest } from '../src/actions/stream-file';
import { clearInactiveStreamStorage } from '../src/stream-storage';
import type { StreamSink } from '../src/streaming';

const parse = (frames: string[]) => frames.map((f) => JSON.parse(f) as Record<string, any>);

afterEach(() => {
    fileTest.cleanDir(STREAM_DOWNLOAD_DIR);
});

describe('test_download_stream', () => {
    it('pushes 10 data frames then a data_complete terminal', async () => {
        const h = new ApiHandler({} as ApiActionContext);
        expect(h.isStreamAction('test_download_stream')).toBe(true);

        const frames: string[] = [];
        await h.processStreamRequest(
            JSON.stringify({ action: 'test_download_stream', params: {}, echo: 'T' }),
            (j) => frames.push(j),
        );

        const got = parse(frames);
        expect(got).toHaveLength(11);
        expect(got[0]).toMatchObject({
            stream: 'stream-action',
            echo: 'T',
            data: { type: 'stream', data_type: 'data_chunk', data: 'Index-> 1' },
        });
        expect(got[9]).toMatchObject({ data: { data: 'Index-> 10' } });
        expect(got[10]).toMatchObject({
            status: 'ok',
            data: {
                type: 'response',
                data_type: 'data_complete',
                data: 'Stream transmission complete',
            },
        });
    });

    it('error=true streams the 10 frames then terminates with an error frame', async () => {
        const h = new ApiHandler({} as ApiActionContext);
        const frames: string[] = [];
        await h.processStreamRequest(
            JSON.stringify({ action: 'test_download_stream', params: { error: true } }),
            (j) => frames.push(j),
        );
        const got = parse(frames);
        expect(got).toHaveLength(11);
        expect(got[9]).toMatchObject({ data: { data_type: 'data_chunk' } });
        expect(got[10]).toMatchObject({ status: 'failed', data: { type: 'error' } });
    });
});

describe('download_file_stream (local, fenced)', () => {
    it('streams file_info → file_chunk* → file_complete and reassembles exactly', async () => {
        fs.mkdirSync(STREAM_DOWNLOAD_DIR, { recursive: true });
        const fp = path.join(STREAM_DOWNLOAD_DIR, 'dl.bin');
        const content = Buffer.from('snowluma stream download payload '.repeat(4000)); // ~128 KB → multiple 64 KB chunks
        fs.writeFileSync(fp, content);

        const h = new ApiHandler({} as ApiActionContext);
        const frames: string[] = [];
        await h.processStreamRequest(
            JSON.stringify({
                action: 'download_file_stream',
                params: { file: fp, chunk_size: 65536 },
                echo: 'D',
            }),
            (j) => frames.push(j),
        );

        const got = parse(frames);
        expect(got[0]).toMatchObject({
            stream: 'stream-action',
            echo: 'D',
            data: {
                data_type: 'file_info',
                file_name: 'dl.bin',
                file_size: content.length,
                chunk_size: 65536,
            },
        });

        const chunks = got.filter((p) => p.data?.data_type === 'file_chunk');
        expect(chunks.length).toBeGreaterThan(1);
        // indices are sequential and progress is monotonic
        chunks.forEach((c, i) => expect(c.data.index).toBe(i));

        const last = got[got.length - 1];
        expect(last).toMatchObject({
            status: 'ok',
            data: {
                type: 'response',
                data_type: 'file_complete',
                total_bytes: content.length,
                total_chunks: chunks.length,
            },
        });

        const reassembled = Buffer.concat(chunks.map((c) => Buffer.from(c.data.data, 'base64')));
        expect(reassembled.equals(content)).toBe(true);
    });

    it('refuses an arbitrary local path outside the stream root [arbitrary-read guard]', async () => {
        await expect(
            __test.resolveDownload('/etc/passwd', {} as ApiActionContext, 'auto', 65536),
        ).rejects.toThrow(/restricted to the stream temp/i);
        await expect(
            __test.resolveDownload('file:///etc/hosts', {} as ApiActionContext, 'auto', 65536),
        ).rejects.toThrow(/restricted to the stream temp/i);

        // and end-to-end the dispatch surfaces it as an error frame, not a leak
        const h = new ApiHandler({} as ApiActionContext);
        const frames: string[] = [];
        await h.processStreamRequest(
            JSON.stringify({ action: 'download_file_stream', params: { file: '/etc/passwd' } }),
            (j) => frames.push(j),
        );
        expect(parse(frames).at(-1)).toMatchObject({ status: 'failed', data: { type: 'error' } });
    });

    it('protects a local stream file from cleanup while it is being downloaded', async () => {
        fs.mkdirSync(STREAM_DOWNLOAD_DIR, { recursive: true });
        const fp = path.join(STREAM_DOWNLOAD_DIR, 'active.bin');
        fs.writeFileSync(fp, 'active download');

        let unblock!: () => void;
        let reachedFirstFrame!: () => void;
        const blocked = new Promise<void>((resolve) => {
            unblock = resolve;
        });
        const firstFrame = new Promise<void>((resolve) => {
            reachedFirstFrame = resolve;
        });
        let sent = false;
        const sink: StreamSink = {
            send: async () => {
                if (sent) {
                    return;
                }

                sent = true;
                reachedFirstFrame();
                await blocked;
            },
        };

        const running = __test.runDownload(fp, 65536, {} as ApiActionContext, sink, 'auto');
        await firstFrame;

        try {
            const duringDownload = clearInactiveStreamStorage();
            expect(duringDownload.skippedActiveItems).toBeGreaterThanOrEqual(1);
            expect(duringDownload.failures).toEqual([]);
            expect(fs.existsSync(fp)).toBe(true);
        } finally {
            unblock();
            await running;
        }

        const afterDownload = clearInactiveStreamStorage();
        expect(afterDownload.deletedFiles).toBeGreaterThanOrEqual(1);
        expect(afterDownload.failures).toEqual([]);
        expect(fs.existsSync(fp)).toBe(false);
    });
});

describe('SSRF guard', () => {
    it('classifies private/loopback/link-local addresses (incl. normalized v4-mapped IPv6) [C2]', () => {
        const priv = [
            '127.0.0.1',
            '10.0.0.5',
            '192.168.1.1',
            '172.16.0.1',
            '169.254.1.1',
            '0.0.0.0',
            '100.64.0.1',
            '::1',
            'fc00::1',
            'fd12::1',
            'fe80::1',
            '::ffff:127.0.0.1',
            '::ffff:169.254.169.254', // dotted v4-mapped
            '::ffff:7f00:1',
            '::ffff:a9fe:a9fe', // hex v4-mapped (what `new URL` produces)
            '::127.0.0.1',
            '64:ff9b::7f00:1', // v4-compatible, NAT64-mapped loopback
        ];

        for (const ip of priv) {
            expect(__test.isPrivateIp(ip), ip).toBe(true);
        }

        for (const ip of [
            '8.8.8.8',
            '1.1.1.1',
            '203.0.113.4',
            '2606:4700:4700::1111',
            '::ffff:8.8.8.8',
        ]) {
            expect(__test.isPrivateIp(ip), ip).toBe(false);
        }
    });

    it('rejects non-http(s) schemes and private/loopback URL targets — incl. v4-mapped literals [C1/C2]', async () => {
        await expect(__test.assertSafeUrl('ftp://example.com/x')).rejects.toThrow(/http\(s\)/i);
        await expect(__test.assertSafeUrl('file:///etc/passwd')).rejects.toThrow(/http\(s\)/i);
        await expect(__test.assertSafeUrl('http://127.0.0.1/x')).rejects.toThrow(
            /private\/loopback/i,
        );
        await expect(__test.assertSafeUrl('http://[::1]/x')).rejects.toThrow(/private\/loopback/i);
        // v4-mapped IPv6 literal → new URL normalizes hostname to hex; must still block
        await expect(__test.assertSafeUrl('http://[::ffff:127.0.0.1]/x')).rejects.toThrow(
            /private\/loopback/i,
        );
        await expect(__test.assertSafeUrl('http://[::ffff:169.254.169.254]/meta')).rejects.toThrow(
            /private\/loopback/i,
        );
        await expect(__test.assertSafeUrl('http://localhost/x')).rejects.toThrow(/private/i);
    });
});

describe('cached image/voice id resolution reaches the media branch [M1]', () => {
    it('a cache id flows past the local check to getImageInfo (then SSRF-guards its URL)', async () => {
        const ctx = {
            getImageInfo: async () => ({
                url: 'http://10.0.0.7/cached.png',
                file: '',
                file_name: 'cached.png',
                file_size: '9',
            }),
            getRecordInfo: async () => null,
        } as unknown as ApiActionContext;
        // 'abc123.image' is not a real file → must NOT be rejected as "restricted";
        // it reaches getImageInfo, whose private URL is then blocked by the SSRF guard.
        await expect(__test.resolveDownload('abc123.image', ctx, 'image', 65536)).rejects.toThrow(
            /private/i,
        );
    });
});