jest.mock("axios", () => ({
  get: jest.fn(),
}));
jest.mock("../../utils/logger", () => ({
  info: jest.fn(),
  warn: jest.fn(),
  error: jest.fn(),
}));

const fs = require("fs");
const fsp = require("fs/promises");
const os = require("os");
const path = require("path");
const { Readable } = require("stream");
const axios = require("axios");
const archive = require("./index");

function setNested(target, dottedKey, value) {
  const keys = dottedKey.split(".");
  let current = target;
  for (let index = 0; index < keys.length - 1; index += 1) {
    current[keys[index]] = current[keys[index]] || {};
    current = current[keys[index]];
  }
  current[keys[keys.length - 1]] = value;
}

function createDatabase(document) {
  const collection = {
    findOne: jest.fn(async (query) => {
      if (query._id !== undefined && query._id !== document._id) return null;
      return document;
    }),
    updateOne: jest.fn(async (_query, update) => {
      Object.entries(update.$set || {}).forEach(([key, value]) => {
        setNested(document, key, value);
      });
      Object.entries(update.$inc || {}).forEach(([key, value]) => {
        const current = key.split(".").reduce((result, part) => result[part], document);
        setNested(document, key, current + value);
      });
      return { modifiedCount: 1 };
    }),
  };
  return {
    collection: jest.fn(() => collection),
  };
}

describe("IM image archive", () => {
  let temporaryRoot;

  beforeEach(async () => {
    jest.clearAllMocks();
    temporaryRoot = await fsp.mkdtemp(path.join(os.tmpdir(), "im-image-archive-"));
    process.env.CONFIG_IM_IMAGE_ROOT = temporaryRoot;
    delete process.env.CONFIG_IM_IMAGE_ALLOWED_HOSTS;
  });

  afterEach(async () => {
    delete process.env.CONFIG_IM_IMAGE_ROOT;
    await fsp.rm(temporaryRoot, { recursive: true, force: true });
  });

  test("prepares the original image from a Tencent callback", () => {
    const message = {
      MsgBody: [
        {
          MsgType: "TIMImageElem",
          MsgContent: {
            UUID: "image-uuid",
            ImageInfoArray: [
              { Type: 3, URL: "https://example.my-imcloud.com/thumb" },
              { Type: 1, URL: "https://example.my-imcloud.com/original", Size: 42 },
            ],
          },
        },
      ],
    };

    const result = archive.prepareMessageForArchive(message);

    expect(result.imageArchive).toMatchObject({
      status: "pending",
      sourceUUID: "image-uuid",
      sourceType: 1,
      sourceURL: "https://example.my-imcloud.com/original",
      expectedSize: 42,
    });
  });

  test("rejects non-Tencent and non-HTTPS source URLs", () => {
    expect(archive._test.isAllowedSourceUrl("https://a.my-imcloud.com/image")).toBe(true);
    expect(archive._test.isAllowedSourceUrl("http://a.my-imcloud.com/image")).toBe(false);
    expect(archive._test.isAllowedSourceUrl("https://my-imcloud.com.example.com/image")).toBe(false);
  });

  test("uses the same ../private-files rule in source and bundled runtime", () => {
    expect(
      archive._test.resolveDefaultImageRoot(
        path.join("/workspace", "hn-hlw-service", "hlw", "im-image-archive"),
        false
      )
    ).toBe(path.resolve("/workspace", "private-files", "im-chat"));
    expect(
      archive._test.resolveDefaultImageRoot("/opt/apps/hnhlw", true)
    ).toBe(path.resolve("/opt/apps", "private-files", "im-chat"));
  });

  test("creates and validates the configured storage directory", async () => {
    const configuredRoot = path.join(temporaryRoot, "nested", "im-chat");
    process.env.CONFIG_IM_IMAGE_ROOT = configuredRoot;

    await expect(archive.initializeStorage()).resolves.toBe(
      path.resolve(configuredRoot)
    );
    await expect(fsp.access(configuredRoot, fs.constants.W_OK)).resolves.toBe(
      undefined
    );
  });

  test("downloads an image and marks the database record successful", async () => {
    const jpeg = Buffer.concat([
      Buffer.from([0xff, 0xd8, 0xff, 0xe0]),
      Buffer.alloc(64, 1),
    ]);
    axios.get.mockResolvedValue({
      headers: { "content-length": String(jpeg.length) },
      data: Readable.from([jpeg]),
    });
    const message = archive.prepareMessageForArchive({
      _id: "document-1",
      MsgId: "message-1",
      MsgTime: 1786013773,
      MsgBody: [
        {
          MsgType: "TIMImageElem",
          MsgContent: {
            UUID: "image-uuid",
            ImageInfoArray: [
              {
                Type: 1,
                URL: "https://a.my-imcloud.com/original",
                Size: jpeg.length,
              },
            ],
          },
        },
      ],
    });
    const db = createDatabase(message);

    await archive._test.archiveDocument(db, message._id);

    expect(message.imageArchive.status).toBe("success");
    expect(message.imageArchive.mimeType).toBe("image/jpeg");
    expect(message.imageArchive.size).toBe(jpeg.length);
    expect(message.imageArchive.relativePath).toMatch(/\.jpg$/);
    expect(
      fs.existsSync(path.resolve(temporaryRoot, message.imageArchive.relativePath))
    ).toBe(true);
  });
});