import { createHash } from "crypto";
import { Readable } from "stream";
import { beforeEach, describe, expect, it } from "vitest";
import { UploadRepo } from "#lib/server/db/index.js";
import { FileService, UploadService } from "#lib/server/services/index.js";
import { isChunkUploaded } from "#lib/server/services/upload.js";
import { ciphertext, createUser, newEntryParams, resetDatabase } from "../helpers/database";

beforeEach(resetDatabase);

describe("upload session bitmap", () => {
  it("matches the bit order of PostgreSQL's set_bit", async () => {
    const { userId } = await createUser();
    const id = crypto.randomUUID();
    await UploadRepo.createFileUploadSession({
      ...newEntryParams(userId, "root"),
      id,
      path: "unused",
      totalChunks: 20,
      expiresAt: new Date(Date.now() + 60_000),
      hskVersion: null,
      contentType: "image/png",
      encCreatedAt: null,
      encLastModifiedAt: ciphertext(),
    });

    const uploaded = [1, 8, 9, 20];
    for (const chunkIndex of uploaded) {
      await UploadRepo.markChunkAsUploaded(id, chunkIndex);
    }

    const session = await UploadRepo.getUploadSession(id, userId);
    expect(session?.uploadedChunks).toBe(uploaded.length);
    for (let chunkIndex = 1; chunkIndex <= 20; chunkIndex++) {
      expect(isChunkUploaded(session!.bitmap, chunkIndex)).toBe(uploaded.includes(chunkIndex));
    }
  });
});

describe("upload completion", () => {
  it("registers the file only once when completed concurrently", async () => {
    const { userId } = await createUser();
    const { uploadId } = await UploadService.startFileUpload({
      ...newEntryParams(userId, "root"),
      totalChunks: 1,
      hskVersion: null,
      contentType: "image/png",
      encCreatedAt: null,
      encLastModifiedAt: ciphertext(),
    });

    const chunk = Buffer.alloc(100, 1);
    await UploadService.uploadChunk(userId, uploadId, 1, Readable.from([chunk]));
    const hash = createHash("sha256").update(chunk).digest("base64");

    const results = await Promise.allSettled([
      UploadService.completeFileUpload(userId, uploadId, null, hash),
      UploadService.completeFileUpload(userId, uploadId, null, hash),
    ]);

    expect(results.filter(({ status }) => status === "fulfilled")).toHaveLength(1);
    expect(results.find(({ status }) => status === "rejected")).toMatchObject({
      reason: { code: "NOT_FOUND" },
    });
    expect(await FileService.getAllFileIds(userId)).toHaveLength(1);
  });

  it("discards corrupted uploads", async () => {
    const { userId } = await createUser();
    const { uploadId } = await UploadService.startFileUpload({
      ...newEntryParams(userId, "root"),
      totalChunks: 1,
      hskVersion: null,
      contentType: "image/png",
      encCreatedAt: null,
      encLastModifiedAt: ciphertext(),
    });
    await UploadService.uploadChunk(userId, uploadId, 1, Readable.from([Buffer.alloc(100)]));

    await expect(
      UploadService.completeFileUpload(userId, uploadId, null, "invalid"),
    ).rejects.toMatchObject({ code: "CONFLICT" });
    expect(await UploadRepo.getUploadSession(uploadId, userId)).toBeNull();
  });

  it("rejects chunks of invalid sizes", async () => {
    const { userId } = await createUser();
    const { uploadId } = await UploadService.startFileUpload({
      ...newEntryParams(userId, "root"),
      totalChunks: 2,
      hskVersion: null,
      contentType: "image/png",
      encCreatedAt: null,
      encLastModifiedAt: ciphertext(),
    });

    await expect(
      UploadService.uploadChunk(userId, uploadId, 1, Readable.from([Buffer.alloc(100)])),
    ).rejects.toMatchObject({ code: "BAD_REQUEST" });
  });
});