import { DatabaseExtension, EXTENSION_NAMES, IDatabaseRepository } from 'src/interfaces/database.interface';
import { ILoggerRepository } from 'src/interfaces/logger.interface';
import { DatabaseService } from 'src/services/database.service';
import { newDatabaseRepositoryMock } from 'test/repositories/database.repository.mock';
import { newLoggerRepositoryMock } from 'test/repositories/logger.repository.mock';
import { Mocked } from 'vitest';

describe(DatabaseService.name, () => {
  let sut: DatabaseService;
  let databaseMock: Mocked<IDatabaseRepository>;
  let loggerMock: Mocked<ILoggerRepository>;
  let extensionRange: string;
  let versionBelowRange: string;
  let minVersionInRange: string;
  let updateInRange: string;
  let versionAboveRange: string;

  beforeEach(() => {
    databaseMock = newDatabaseRepositoryMock();
    loggerMock = newLoggerRepositoryMock();
    sut = new DatabaseService(databaseMock, loggerMock);

    extensionRange = '0.2.x';
    databaseMock.getExtensionVersionRange.mockReturnValue(extensionRange);

    versionBelowRange = '0.1.0';
    minVersionInRange = '0.2.0';
    updateInRange = '0.2.1';
    versionAboveRange = '0.3.0';
    databaseMock.getExtensionVersion.mockResolvedValue({
      installedVersion: minVersionInRange,
      availableVersion: minVersionInRange,
    });
  });

  afterEach(() => {
    delete process.env.DB_SKIP_MIGRATIONS;
    delete process.env.DB_VECTOR_EXTENSION;
  });

  it('should work', () => {
    expect(sut).toBeDefined();
  });

  it('should throw an error if PostgreSQL version is below minimum supported version', async () => {
    databaseMock.getPostgresVersion.mockResolvedValueOnce('13.10.0');

    await expect(sut.onBootstrapEvent()).rejects.toThrow('Invalid PostgreSQL version. Found 13.10.0');

    expect(databaseMock.getPostgresVersion).toHaveBeenCalledTimes(1);
  });

  describe.each([
    { extension: DatabaseExtension.VECTOR, extensionName: EXTENSION_NAMES[DatabaseExtension.VECTOR] },
    { extension: DatabaseExtension.VECTORS, extensionName: EXTENSION_NAMES[DatabaseExtension.VECTORS] },
  ])('should work with $extensionName', ({ extension, extensionName }) => {
    beforeEach(() => {
      process.env.DB_VECTOR_EXTENSION = extensionName;
    });

    it(`should start up successfully with ${extension}`, async () => {
      databaseMock.getPostgresVersion.mockResolvedValue('14.0.0');
      databaseMock.getExtensionVersion.mockResolvedValue({
        installedVersion: null,
        availableVersion: minVersionInRange,
      });

      await expect(sut.onBootstrapEvent()).resolves.toBeUndefined();

      expect(databaseMock.getPostgresVersion).toHaveBeenCalled();
      expect(databaseMock.createExtension).toHaveBeenCalledWith(extension);
      expect(databaseMock.createExtension).toHaveBeenCalledTimes(1);
      expect(databaseMock.getExtensionVersion).toHaveBeenCalled();
      expect(databaseMock.runMigrations).toHaveBeenCalledTimes(1);
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it(`should throw an error if the ${extension} extension is not installed`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({ installedVersion: null, availableVersion: null });
      const message = `The ${extensionName} extension is not available in this Postgres instance.
    If using a container image, ensure the image has the extension installed.`;
      await expect(sut.onBootstrapEvent()).rejects.toThrow(message);

      expect(databaseMock.createExtension).not.toHaveBeenCalled();
      expect(databaseMock.runMigrations).not.toHaveBeenCalled();
    });

    it(`should throw an error if the ${extension} extension version is below minimum supported version`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({
        installedVersion: versionBelowRange,
        availableVersion: versionBelowRange,
      });

      await expect(sut.onBootstrapEvent()).rejects.toThrow(
        `The ${extensionName} extension version is ${versionBelowRange}, but Immich only supports ${extensionRange}`,
      );

      expect(databaseMock.runMigrations).not.toHaveBeenCalled();
    });

    it(`should throw an error if ${extension} extension version is a nightly`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({ installedVersion: '0.0.0', availableVersion: '0.0.0' });

      await expect(sut.onBootstrapEvent()).rejects.toThrow(
        `The ${extensionName} extension version is 0.0.0, which means it is a nightly release.`,
      );

      expect(databaseMock.createExtension).not.toHaveBeenCalled();
      expect(databaseMock.updateVectorExtension).not.toHaveBeenCalled();
      expect(databaseMock.runMigrations).not.toHaveBeenCalled();
    });

    it(`should do in-range update for ${extension} extension`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({
        availableVersion: updateInRange,
        installedVersion: minVersionInRange,
      });
      databaseMock.updateVectorExtension.mockResolvedValue({ restartRequired: false });

      await expect(sut.onBootstrapEvent()).resolves.toBeUndefined();

      expect(databaseMock.updateVectorExtension).toHaveBeenCalledWith(extension, updateInRange);
      expect(databaseMock.updateVectorExtension).toHaveBeenCalledTimes(1);
      expect(databaseMock.getExtensionVersion).toHaveBeenCalled();
      expect(databaseMock.runMigrations).toHaveBeenCalledTimes(1);
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it(`should not upgrade ${extension} if same version`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({
        availableVersion: minVersionInRange,
        installedVersion: minVersionInRange,
      });

      await expect(sut.onBootstrapEvent()).resolves.toBeUndefined();

      expect(databaseMock.updateVectorExtension).not.toHaveBeenCalled();
      expect(databaseMock.runMigrations).toHaveBeenCalledTimes(1);
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it(`should throw error if ${extension} available version is below range`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({
        availableVersion: versionBelowRange,
        installedVersion: null,
      });

      await expect(sut.onBootstrapEvent()).rejects.toThrow();

      expect(databaseMock.createExtension).not.toHaveBeenCalled();
      expect(databaseMock.updateVectorExtension).not.toHaveBeenCalled();
      expect(databaseMock.runMigrations).not.toHaveBeenCalled();
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it(`should throw error if ${extension} available version is above range`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({
        availableVersion: versionAboveRange,
        installedVersion: minVersionInRange,
      });

      await expect(sut.onBootstrapEvent()).rejects.toThrow();

      expect(databaseMock.createExtension).not.toHaveBeenCalled();
      expect(databaseMock.updateVectorExtension).not.toHaveBeenCalled();
      expect(databaseMock.runMigrations).not.toHaveBeenCalled();
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it('should throw error if available version is below installed version', async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({
        availableVersion: minVersionInRange,
        installedVersion: updateInRange,
      });

      await expect(sut.onBootstrapEvent()).rejects.toThrow(
        `The database currently has ${extensionName} ${updateInRange} activated, but the Postgres instance only has ${minVersionInRange} available.`,
      );

      expect(databaseMock.updateVectorExtension).not.toHaveBeenCalled();
      expect(databaseMock.runMigrations).not.toHaveBeenCalled();
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it(`should raise error if ${extension} extension upgrade failed`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({
        availableVersion: updateInRange,
        installedVersion: minVersionInRange,
      });
      databaseMock.updateVectorExtension.mockRejectedValue(new Error('Failed to update extension'));

      await expect(sut.onBootstrapEvent()).rejects.toThrow('Failed to update extension');

      expect(loggerMock.warn.mock.calls[0][0]).toContain(
        `The ${extensionName} extension can be updated to ${updateInRange}.`,
      );
      expect(loggerMock.fatal).not.toHaveBeenCalled();
      expect(databaseMock.updateVectorExtension).toHaveBeenCalledWith(extension, updateInRange);
      expect(databaseMock.runMigrations).not.toHaveBeenCalled();
    });

    it(`should warn if ${extension} extension update requires restart`, async () => {
      databaseMock.getExtensionVersion.mockResolvedValue({
        availableVersion: updateInRange,
        installedVersion: minVersionInRange,
      });
      databaseMock.updateVectorExtension.mockResolvedValue({ restartRequired: true });

      await expect(sut.onBootstrapEvent()).resolves.toBeUndefined();

      expect(loggerMock.warn).toHaveBeenCalledTimes(1);
      expect(loggerMock.warn.mock.calls[0][0]).toContain(extensionName);
      expect(databaseMock.updateVectorExtension).toHaveBeenCalledWith(extension, updateInRange);
      expect(databaseMock.runMigrations).toHaveBeenCalledTimes(1);
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it(`should reindex ${extension} indices if needed`, async () => {
      databaseMock.shouldReindex.mockResolvedValue(true);

      await expect(sut.onBootstrapEvent()).resolves.toBeUndefined();

      expect(databaseMock.shouldReindex).toHaveBeenCalledTimes(2);
      expect(databaseMock.reindex).toHaveBeenCalledTimes(2);
      expect(databaseMock.runMigrations).toHaveBeenCalledTimes(1);
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it(`should not reindex ${extension} indices if not needed`, async () => {
      databaseMock.shouldReindex.mockResolvedValue(false);

      await expect(sut.onBootstrapEvent()).resolves.toBeUndefined();

      expect(databaseMock.shouldReindex).toHaveBeenCalledTimes(2);
      expect(databaseMock.reindex).toHaveBeenCalledTimes(0);
      expect(databaseMock.runMigrations).toHaveBeenCalledTimes(1);
      expect(loggerMock.fatal).not.toHaveBeenCalled();
    });

    it('should skip migrations if DB_SKIP_MIGRATIONS=true', async () => {
      process.env.DB_SKIP_MIGRATIONS = 'true';

      await expect(sut.onBootstrapEvent()).resolves.toBeUndefined();

      expect(databaseMock.runMigrations).not.toHaveBeenCalled();
    });
  });

  it(`should throw error if pgvector extension could not be created`, async () => {
    process.env.DB_VECTOR_EXTENSION = 'pgvector';
    databaseMock.getExtensionVersion.mockResolvedValue({
      installedVersion: null,
      availableVersion: minVersionInRange,
    });
    databaseMock.updateVectorExtension.mockResolvedValue({ restartRequired: false });
    databaseMock.createExtension.mockRejectedValue(new Error('Failed to create extension'));

    await expect(sut.onBootstrapEvent()).rejects.toThrow('Failed to create extension');

    expect(loggerMock.fatal).toHaveBeenCalledTimes(1);
    expect(loggerMock.fatal.mock.calls[0][0]).toContain(
      `Alternatively, if your Postgres instance has pgvecto.rs, you may use this instead`,
    );
    expect(databaseMock.createExtension).toHaveBeenCalledTimes(1);
    expect(databaseMock.updateVectorExtension).not.toHaveBeenCalled();
    expect(databaseMock.runMigrations).not.toHaveBeenCalled();
  });

  it(`should throw error if pgvecto.rs extension could not be created`, async () => {
    databaseMock.getExtensionVersion.mockResolvedValue({
      installedVersion: null,
      availableVersion: minVersionInRange,
    });
    databaseMock.updateVectorExtension.mockResolvedValue({ restartRequired: false });
    databaseMock.createExtension.mockRejectedValue(new Error('Failed to create extension'));

    await expect(sut.onBootstrapEvent()).rejects.toThrow('Failed to create extension');

    expect(loggerMock.fatal).toHaveBeenCalledTimes(1);
    expect(loggerMock.fatal.mock.calls[0][0]).toContain(
      `Alternatively, if your Postgres instance has pgvector, you may use this instead`,
    );
    expect(databaseMock.createExtension).toHaveBeenCalledTimes(1);
    expect(databaseMock.updateVectorExtension).not.toHaveBeenCalled();
    expect(databaseMock.runMigrations).not.toHaveBeenCalled();
  });
});