import { afterEach, beforeEach, describe, expect, it, jest } from "@jest/globals";
import { InMemoryNotificationRepository } from "../../src/repositories/notifications/InMemoryNotificationRepository";
import { NotificationEvent, NotificationRepository } from "../../src/repositories/notifications/NotificationRepository";
import { RedisNotificationRepository } from "../../src/repositories/notifications/RedisNotificationRepository";

interface RepositoryHolder {
  name: string;
  factory(): Promise<NotificationRepository>,
  teardown(): Promise<void>,
}

class InMemoryRepositoryHolder implements RepositoryHolder {
  name = 'InMemoryNotificationRepository';
  factory = async () => {
    return new InMemoryNotificationRepository();
  }
  teardown = async () => {}
}

class RedisNotificationRepositoryHolder implements RepositoryHolder {
  repo: RedisNotificationRepository | undefined;

  name = 'RedisNotificationRepository';
  factory = async () => {
    this.repo = new RedisNotificationRepository();
    await this.repo.connect();
    return this.repo;
  }
  teardown = async () => {
    if (this.repo) {
      await this.repo.clearAllData();
      await this.repo.disconnect();
    }
  }
}

const repositoryImplementations = [
  new InMemoryRepositoryHolder(),
  new RedisNotificationRepositoryHolder(),
]

describe.each(repositoryImplementations)('$name', (holder) => {
  let repo: NotificationRepository;

  beforeEach(async () => {
    repo = await holder.factory();
  });

  afterEach(async () => {
    await holder.teardown();
  })

  const notification = {
    deviceId: "device1",
    shuttleId: "shuttle1",
    stopId: "stop1",
    secondsThreshold: 180
  };

  describe("getAllNotificationsForShuttleAndStopId", () => {
    it("gets notifications correctly", async () => {
      await repo.addOrUpdateNotification(notification);

      const result = await repo.getAllNotificationsForShuttleAndStopId("shuttle1", "stop1");
      expect(result).toHaveLength(1);
      expect(result[0]).toEqual(notification);
    });

    it("returns empty array if no notifications", async () => {
      const result = await repo.getAllNotificationsForShuttleAndStopId("shuttle1", "stop1");
      expect(result).toEqual([]);
    });
  });

  describe("getSecondsThresholdForNotificationIfExists", () => {
    it("gets the seconds threshold if exists", async () => {
      await repo.addOrUpdateNotification(notification);

      const result = await repo.getSecondsThresholdForNotificationIfExists({
        deviceId: "device1",
        shuttleId: "shuttle1",
        stopId: "stop1"
      });
      expect(result).toBe(180);
    });

    it("returns null if there is no seconds threshold", async () => {
      const result = await repo.getSecondsThresholdForNotificationIfExists({
        deviceId: "device1",
        shuttleId: "shuttle1",
        stopId: "stop1"
      });
      expect(result).toBeNull();
    });
  });

  describe("addOrUpdateNotification", () => {
    // Add/get flow is covered in getAllNotificationsForShuttleAndStopId

    it("updates the seconds threshold if the notification exists already", async () => {
      await repo.addOrUpdateNotification(notification);
      await repo.addOrUpdateNotification({...notification, secondsThreshold: 300});

      const result = await repo.getSecondsThresholdForNotificationIfExists({
        deviceId: "device1",
        shuttleId: "shuttle1",
        stopId: "stop1"
      });
      expect(result).toBe(300);
    });
  });

  describe("deleteNotificationIfExists", () => {
    it("deletes the notification", async () => {
      await repo.addOrUpdateNotification(notification);
      await repo.deleteNotificationIfExists(notification);

      const result = await repo.getAllNotificationsForShuttleAndStopId("shuttle1", "stop1");
      expect(result).toHaveLength(0);
    });


    it("does nothing if there's no notification", async () => {
      await expect(repo.deleteNotificationIfExists({
        deviceId: "device1",
        shuttleId: "shuttle1",
        stopId: "stop1"
      })).resolves.not.toThrow();
    });
  });

  describe("subscribeToNotificationChanges", () => {
    it("calls subscribers when something is added", async () => {
      const mockCallback = jest.fn();
      repo.subscribeToNotificationChanges(mockCallback);

      await repo.addOrUpdateNotification(notification);

      const expectedEvent: NotificationEvent = {
        event: 'addOrUpdate',
        notification,
      }
      expect(mockCallback).toHaveBeenCalledTimes(1);
      expect(mockCallback).toHaveBeenCalledWith(expectedEvent);
    });

    it("calls subscribers when something is updated", async () => {
      const mockCallback = jest.fn();
      repo.subscribeToNotificationChanges(mockCallback);

      await repo.addOrUpdateNotification(notification);

      const updatedNotification = {
        ...notification,
        secondsThreshold: notification.secondsThreshold + 60,
      };

      await repo.addOrUpdateNotification(updatedNotification);

      const expectedEvent: NotificationEvent = {
        event: 'addOrUpdate',
        notification,
      }
      expect(mockCallback).toHaveBeenCalledTimes(2);
      expect(mockCallback).toHaveBeenCalledWith(expectedEvent);
    });

    it("calls subscribers when something is deleted", async () => {
      await repo.addOrUpdateNotification(notification);

      const mockCallback = jest.fn();
      repo.subscribeToNotificationChanges(mockCallback);

      await repo.deleteNotificationIfExists(notification);

      expect(mockCallback).toHaveBeenCalledTimes(1);

      const expectedEvent: NotificationEvent = {
        event: 'delete',
        notification,
      };
      expect(mockCallback).toHaveBeenCalledWith(expectedEvent);
    });
  });

  describe("unsubscribeFromNotificationChanges", () => {
    it("stops calling subscribers when unsubscribed", async () => {
      const mockCallback = jest.fn();
      repo.subscribeToNotificationChanges(mockCallback);

      await repo.addOrUpdateNotification(notification);

      repo.unsubscribeFromNotificationChanges(mockCallback);

      await repo.deleteNotificationIfExists(notification);

      expect(mockCallback).toHaveBeenCalledTimes(1);
    });
  });

  describe("isNotificationScheduled", () => {
    it("returns true if the notification is in the repo", async () => {
      await repo.addOrUpdateNotification(notification);
      const result = await repo.isNotificationScheduled(notification);
      expect(result).toBe(true);
    });

    it("returns false if the notification isn't in the repo", async () => {
      const result = await repo.isNotificationScheduled(notification);
      expect(result).toBe(false);
    })
  });
});