import { test } from 'node:test';
import assert from 'node:assert/strict';
import { createHash, randomUUID } from 'node:crypto';
import { readdir, readFile, writeFile } from 'node:fs/promises';
import { eq } from 'drizzle-orm';
import { fixture } from './helpers.js';
import { CHUNK_BYTES, ResumableUploads } from '../src/resumable.js';
import * as schema from '../src/db/schema.js';

const digest = (bytes) => createHash('sha256').update(bytes).digest();
function fingerprint(bytes) {
  const hashes = [];
  for (let offset = 0; offset < bytes.length; offset += CHUNK_BYTES)
    hashes.push(digest(bytes.subarray(offset, offset + CHUNK_BYTES)));
  return digest(Buffer.concat(hashes)).toString('hex');
}
async function prepare(f, bytes, accept = true) {
  const a = await f.create(),
    b = await f.create();
  await f.space(a, b);
  const response = await f.call(
    a,
    '/transfer-requests',
    'POST',
    {
      targetDeviceId: b.deviceId,
      kind: 'file',
      byteSize: bytes.length,
      count: 1,
      files: [{ name: 'resumable.bin', size: bytes.length, type: 'application/octet-stream' }],
    },
    randomUUID(),
  );
  assert.equal(response.statusCode, 200, response.body);
  const requestId = response.json().requestId;
  if (accept)
    assert.equal(
      (await f.call(b, `/transfer-requests/${requestId}/accept`, 'POST', {}, randomUUID()))
        .statusCode,
      200,
    );
  const start = (sender = a, content = bytes) =>
    f.call(sender, '/uploads/resumable', 'POST', {
      requestId,
      fileIndex: 0,
      fingerprint: fingerprint(content),
    });
  return { a, b, requestId, start };
}
const put = (f, sender, id, offset, bytes) =>
  f.call(sender, `/uploads/resumable/${id}`, 'PUT', bytes, undefined, {
    'content-type': 'application/octet-stream',
    'upload-offset': String(offset),
  });

test('분할 업로드는 수락·발신 권한·Origin·CSRF를 검사한다', async () => {
  const f = await fixture();
  try {
    const p = await prepare(f, Buffer.from('hello'), false);
    assert.equal((await p.start()).statusCode, 409);
    await f.call(p.b, `/transfer-requests/${p.requestId}/accept`, 'POST', {}, randomUUID());
    assert.equal((await p.start(p.b)).statusCode, 403);
    const state = (await p.start()).json();
    assert.equal(
      (
        await f.call(
          p.a,
          `/uploads/resumable/${state.uploadId}`,
          'PUT',
          Buffer.from('hello'),
          undefined,
          {
            'content-type': 'application/octet-stream',
            'upload-offset': '0',
            origin: 'https://evil.test',
          },
        )
      ).statusCode,
      403,
    );
    assert.equal(
      (
        await f.call(
          p.a,
          `/uploads/resumable/${state.uploadId}`,
          'PUT',
          Buffer.from('hello'),
          undefined,
          {
            'content-type': 'application/octet-stream',
            'upload-offset': '0',
            'x-csrf-token': 'wrong',
          },
        )
      ).statusCode,
      403,
    );
  } finally {
    await f.close();
  }
});
test('받은 조각의 중복·다른 내용·순서를 검사하고 이어 받아 원본을 확정한다', async () => {
  const f = await fixture();
  try {
    const bytes = Buffer.alloc(CHUNK_BYTES + 13, 71),
      p = await prepare(f, bytes);
    const state = (await p.start()).json(),
      path = `/uploads/resumable/${state.uploadId}`;
    const first = bytes.subarray(0, CHUNK_BYTES);
    assert.equal(
      (await put(f, p.a, state.uploadId, CHUNK_BYTES, bytes.subarray(CHUNK_BYTES))).json().code,
      'UPLOAD_OFFSET',
    );
    assert.equal((await put(f, p.a, state.uploadId, 0, first)).json().offset, CHUNK_BYTES);
    assert.equal((await put(f, p.a, state.uploadId, 0, first)).json().offset, CHUNK_BYTES);
    assert.equal(
      (await put(f, p.a, state.uploadId, 0, Buffer.alloc(CHUNK_BYTES, 72))).json().code,
      'CHUNK_CONFLICT',
    );
    assert.equal(
      (await f.call(p.a, `${path}/complete`, 'POST', {})).json().code,
      'UPLOAD_INCOMPLETE',
    );
    f.service.resumable = new ResumableUploads(f.service);
    assert.equal((await p.start()).json().offset, CHUNK_BYTES);
    assert.equal((await p.start(p.a, Buffer.alloc(bytes.length, 73))).json().code, 'FILE_CHANGED');
    assert.equal(
      (await put(f, p.a, state.uploadId, CHUNK_BYTES, bytes.subarray(CHUNK_BYTES))).statusCode,
      200,
    );
    assert.equal((await f.call(p.a, `${path}/complete`, 'POST', {})).statusCode, 200);
    assert.equal((await f.call(p.a, `${path}/complete`, 'POST', {})).statusCode, 200);
    const item = (await f.call(p.b, '/device/items')).json().items[0];
    const download = await f.call(p.b, `/access/${item.accessId}/download`);
    assert.deepEqual(download.rawPayload, bytes);
    assert.equal((await readdir(f.service.resumable.directory)).length, 0);
  } finally {
    await f.close();
  }
});
test('8MiB 초과·전체 파일 검증 실패·취소는 자료 확정을 막고 임시 파일을 정리한다', async () => {
  const f = await fixture();
  try {
    const bytes = Buffer.from('original'),
      p = await prepare(f, bytes);
    const state = (await p.start()).json();
    assert.equal(
      (await put(f, p.a, state.uploadId, 0, Buffer.alloc(CHUNK_BYTES + 1))).statusCode,
      413,
    );
    assert.equal((await put(f, p.a, state.uploadId, 0, Buffer.from('tampered'))).statusCode, 200);
    assert.equal(
      (await f.call(p.a, `/uploads/resumable/${state.uploadId}/complete`, 'POST', {})).json().code,
      'FILE_CHECKSUM',
    );
    assert.equal((await f.call(p.b, '/device/items')).json().items.length, 0);
    await f.call(p.a, `/transfer-requests/${p.requestId}/cancel`, 'POST', {});
    assert.equal((await readdir(f.service.resumable.directory)).length, 0);
    assert.equal((await put(f, p.a, state.uploadId, 0, bytes)).statusCode, 409);
  } finally {
    await f.close();
  }
});
test('메타데이터 저장 전 중단된 쓰기는 마지막 확정 위치로 복구하고 만료 조각을 정리한다', async () => {
  const f = await fixture();
  try {
    const p = await prepare(f, Buffer.from('crash')),
      state = (await p.start()).json();
    await writeFile(f.service.resumable.path(state.uploadId, 'part'), 'uncommitted');
    assert.equal((await p.start()).json().offset, 0);
    assert.equal((await readFile(f.service.resumable.path(state.uploadId, 'part'))).length, 0);
    f.service.db
      .update(schema.requests)
      .set({ startBy: Date.now() - 1 })
      .where(eq(schema.requests.id, p.requestId))
      .run();
    f.service.resumable.cleanup();
    assert.equal((await readdir(f.service.resumable.directory)).length, 0);
  } finally {
    await f.close();
  }
});