import { existsSync } from 'node:fs';
import { utimes, writeFile, mkdir } from 'node:fs/promises';
import { join } from 'node:path';

import { INestApplication } from '@nestjs/common';
import { PrismaClient } from '@prisma/client';
import request from 'supertest';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';

import { createTestApp, sessionCookieOf } from '../testing/test-app';
import { createTestPrisma, hasTestDb, uniqueSuffix } from '../testing/test-db';
import { UsersService } from '../users/users.service';
import { OrphanSweepService } from './orphan-sweep.service';

const HOUR = 60 * 60 * 1000;

/**
 * Orphan-file sweep (issue #194): unclaimed attachments past the grace
 * period are reclaimed (row, file, quota), fresh ones are protected
 * (paste-then-insert), claimed ones are never touched — the page
 * attachments panel is a legitimate reference — and stray files without a
 * database row disappear once old enough.
 */
describe.skipIf(!hasTestDb)('orphan file sweep (e2e, issue #194)', () => {
  let app: INestApplication;
  let prisma: PrismaClient;
  const suffix = uniqueSuffix();
  const password = 'orphan sweep pass 1';
  const ids: Record<string, string> = {};
  const cookies: Record<string, string> = {};
  let pondId: string;
  let pageId: string;

  const api = () => request(app.getHttpServer());
  const fileOnDisk = (fondId: string, fileId: string) =>
    join(process.env.UPLOADS_DIR!, fondId, fileId);

  async function makeUser(handle: string, siteAdmin = false): Promise<void> {
    const users = app.get(UsersService);
    const username = `os-${handle}-${suffix}`;
    const user = await users.createUser({
      username,
      email: `${username}@example.org`,
      displayName: `Sweep ${handle}`,
      password,
      locale: 'en',
    });
    ids[handle] = user.id;
    await users.markEmailVerified(user.id);
    if (siteAdmin) {
      await prisma.user.update({ where: { id: user.id }, data: { isSiteAdmin: true } });
    }
    cookies[handle] = sessionCookieOf(
      await api()
        .post('/api/v1/auth/login')
        .send({ usernameOrEmail: username, password })
        .expect(200),
    );
  }

  /** A real upload via the pond route (pageId stays null = unclaimed). */
  async function uploadUnclaimed(name: string): Promise<string> {
    const res = await api()
      .post(`/api/v1/ponds/${pondId}/files`)
      .set('Cookie', cookies.owner!)
      .attach('file', Buffer.from(`bytes of ${name}`), name)
      .expect(201);
    return res.body.id as string;
  }

  function backdate(attachmentId: string, ageMs: number): Promise<unknown> {
    return prisma.attachment.update({
      where: { id: attachmentId },
      data: { createdAt: new Date(Date.now() - ageMs) },
    });
  }

  beforeAll(async () => {
    prisma = createTestPrisma();
    await prisma.rateLimit.deleteMany({});
    app = await createTestApp();
    await makeUser('owner');
    await makeUser('admin', true);
    await api()
      .put(`/api/v1/admin/quotas/user/${ids.owner!}/additional_ponds`)
      .set('Cookie', cookies.admin!)
      .send({ value: 5 })
      .expect(200);
    const pond = await api()
      .post('/api/v1/ponds')
      .set('Cookie', cookies.owner!)
      .send({ name: `Sweep Pond ${suffix}` })
      .expect(201);
    pondId = pond.body.id;
    const page = await api()
      .post(`/api/v1/ponds/${pondId}/pages`)
      .set('Cookie', cookies.owner!)
      .send({ title: `Sweep Page ${suffix}` })
      .expect(201);
    pageId = page.body.id;
  });

  afterAll(async () => {
    const all = Object.values(ids);
    await prisma.quotaOverride.deleteMany({ where: { subjectId: { in: all } } });
    await prisma.auditEntry.deleteMany({ where: { actorId: { in: all } } });
    const ponds = await prisma.pond.findMany({
      where: { ownerId: { in: all } },
      select: { id: true },
    });
    const pondIds = ponds.map((p) => p.id);
    await prisma.attachment.deleteMany({ where: { pondId: { in: pondIds } } });
    await prisma.page.deleteMany({ where: { pondId: { in: pondIds } } });
    await prisma.pond.deleteMany({ where: { id: { in: pondIds } } });
    await prisma.watch.deleteMany({ where: { userId: { in: all } } });
    await prisma.session.deleteMany({ where: { userId: { in: all } } });
    await prisma.userIdentity.deleteMany({ where: { userId: { in: all } } });
    await prisma.user.deleteMany({ where: { id: { in: all } } });
    await prisma.$disconnect();
    await app.close();
  });

  it('reclaims unclaimed attachments past the grace period, protects fresh and claimed ones', async () => {
    const oldUnclaimed = await uploadUnclaimed('old-unclaimed.txt');
    const freshUnclaimed = await uploadUnclaimed('fresh-unclaimed.txt');
    const oldClaimed = await api()
      .post(`/api/v1/pages/${pageId}/files`)
      .set('Cookie', cookies.owner!)
      .attach('file', Buffer.from('panel asset'), 'panel-asset.txt')
      .expect(201);
    await backdate(oldUnclaimed, 25 * HOUR);
    await backdate(oldClaimed.body.id, 25 * HOUR);

    const usageBefore = await prisma.pondUsage.findUnique({ where: { pondId } });
    const reclaimedBytes = (
      await prisma.attachment.findUniqueOrThrow({
        where: { id: oldUnclaimed },
      })
    ).sizeBytes;

    const result = await app.get(OrphanSweepService).sweep();
    expect(result.reclaimed).toBeGreaterThanOrEqual(1);

    // The old unclaimed upload is gone: row, file, quota.
    expect(await prisma.attachment.findUnique({ where: { id: oldUnclaimed } })).toBeNull();
    expect(existsSync(fileOnDisk(pondId, oldUnclaimed))).toBe(false);
    const usageAfter = await prisma.pondUsage.findUnique({ where: { pondId } });
    expect(Number(usageBefore!.storageBytesUsed) - Number(usageAfter!.storageBytesUsed)).toBe(
      reclaimedBytes,
    );

    // The fresh unclaimed upload survives (paste-then-insert grace).
    expect(await prisma.attachment.findUnique({ where: { id: freshUnclaimed } })).not.toBeNull();
    expect(existsSync(fileOnDisk(pondId, freshUnclaimed))).toBe(true);

    // The claimed panel asset survives despite its age — never swept.
    expect(
      await prisma.attachment.findUnique({ where: { id: oldClaimed.body.id } }),
    ).not.toBeNull();
    expect(existsSync(fileOnDisk(pondId, oldClaimed.body.id))).toBe(true);
  });

  it('removes stray files without a database row once they are old enough', async () => {
    const dir = join(process.env.UPLOADS_DIR!, pondId);
    await mkdir(dir, { recursive: true });
    const oldStray = join(dir, `stray-old-${suffix}`);
    const freshStray = join(dir, `stray-fresh-${suffix}`);
    await writeFile(oldStray, 'stray bytes');
    await writeFile(freshStray, 'stray bytes');
    const past = new Date(Date.now() - 25 * HOUR);
    await utimes(oldStray, past, past);

    const result = await app.get(OrphanSweepService).sweep();

    expect(existsSync(oldStray)).toBe(false);
    expect(existsSync(freshStray)).toBe(true);
    expect(result.strays).toBeGreaterThanOrEqual(1);
  });
});