import "fake-indexeddb/auto"
import "core-js/stable/structured-clone"
import initWorker from "./worker"
import Dexie, { EntityTable } from "dexie"

function createSubscription(testToken = "HI") {
  return {
    toJSON: () => ({
      subscription: testToken,
    }),
  }
}

const createSelf = () =>
  ({
    addEventListener: jest.fn(),
    skipWaiting: jest.fn(() => Promise.resolve()),
    registration: {
      pushManager: {
        subscribe: jest.fn(() => Promise.resolve(createSubscription())),
        getSubscription: jest.fn(() => Promise.resolve(createSubscription())),
      },
    },
    clients: {
      claim: jest.fn(() => Promise.resolve()),
    },
  }) as unknown as ServiceWorkerGlobalScope

let originalWindow: Window & typeof globalThis

describe("service worker", () => {
  let self: ServiceWorkerGlobalScope

  beforeEach(() => {
    originalWindow = global.window
    global.window = undefined as any
    indexedDB = new IDBFactory()
    self = createSelf()

    // fetchMock.mockIf(/http:\/\/localhost\/api\/subscribe\/?/, (req) => {
    //   return Promise.resolve(
    //     req.method === "POST"
    //       ? {
    //           body: JSON.stringify({ subscriptionId: 123 }),
    //         }
    //       : req.method === "PUT"
    //         ? { init: { status: 200 } }
    //         : { init: { status: 405 } }
    //   )
    // })

    fetchMock.mockResponse((req) => {
      return Promise.resolve(
        req.method === "POST"
          ? {
              body: JSON.stringify({ subscriptionId: 123 }),
            }
          : req.method === "PUT"
            ? { init: { status: 200 } }
            : { init: { status: 405 } }
      )
    })
  })

  afterEach(() => {
    jest.clearAllMocks()
    global.window = originalWindow
  })

  xtest("displays push notifications", () => {
    initWorker(self)

    const pushHandler = getHandler("push")

    const pushEvent = createEvent({ data: "HI" })
    pushHandler(pushEvent)
  })

  test("claims on activate", async () => {
    initWorker(self)

    const activateHandler = getHandler("activate")

    const event = createEvent()
    activateHandler(event)
    await waitUntilCalls(event)

    expect(self.clients.claim).toHaveBeenCalled()
  })

  test("skips waiting on install", async () => {
    initWorker(self)

    const installHandler = getHandler("install")

    const event = createEvent()
    installHandler(event)
    await waitUntilCalls(event)

    expect(self.skipWaiting).toHaveBeenCalled()
  })

  describe("on subscription message", () => {
    test("puts push subscription if the subscription id is set", async () => {
      initWorker(self)
      await setSavedSubscription(5000)

      const messageHandler = getHandler("message")

      const messageEvent = createEvent({
        data: {
          subscription: { subscription: "YO" },
          type: "subscribed",
        },
      })
      messageHandler(messageEvent)
      await waitUntilCalls(messageEvent)

      expect(fetch).toHaveBeenCalledWith(
        `${process.env.BASE_URL}/api/subscription/5000`,
        {
          method: "PUT",
          body: JSON.stringify({ subscription: "YO" }),
          headers: {
            "Content-Type": "application/json",
          },
        }
      )
    })

    test("posts to subscriptions when there is no user set", async () => {
      initWorker(self)

      const messageHandler = getHandler("message")

      const messageEvent = createEvent({
        data: {
          subscription: { subscription: "YO" },
          type: "subscribed",
        },
      })
      messageHandler(messageEvent)
      await waitUntilCalls(messageEvent)

      expect(fetch).toHaveBeenCalledWith(
        `${process.env.BASE_URL}/api/subscription/`,
        {
          method: "POST",
          body: JSON.stringify({ subscription: "YO" }),
          headers: {
            "Content-Type": "application/json",
          },
        }
      )
    })

    test("subscription id is saved on first subscription change", async () => {
      initWorker(self)

      const messageHandler = getHandler("message")

      const messageEvent = createEvent({
        data: {
          subscription: { subscription: "YO" },
          type: "subscribed",
        },
      })
      messageHandler(messageEvent)
      await waitUntilCalls(messageEvent)

      expect(await getSavedSubscription()).toEqual({
        id: 1,
        subscriptionId: 123,
      })
    })
  })

  describe("on subscription change", () => {
    test("puts push subscription if the subscription id is set", async () => {
      initWorker(self)
      await setSavedSubscription(5000)

      const changeHandler = getHandler("pushsubscriptionchange")

      const changeEvent = createEvent()
      changeHandler(changeEvent)
      await waitUntilCalls(changeEvent)

      expect(self.registration.pushManager.subscribe).toHaveBeenCalledWith({
        userVisibleOnly: true,
        applicationServerKey: expect.any(Uint8Array),
      })

      expect(fetch).toHaveBeenCalledWith(
        `${process.env.BASE_URL}/api/subscription/5000`,
        {
          method: "PUT",
          body: JSON.stringify({ subscription: "HI" }),
          headers: {
            "Content-Type": "application/json",
          },
        }
      )
    })

    test("posts to subscriptions when there is no user set", async () => {
      initWorker(self)

      const changeHandler = getHandler("pushsubscriptionchange")

      const changeEvent = createEvent()
      changeHandler(changeEvent)
      await waitUntilCalls(changeEvent)

      expect(self.registration.pushManager.subscribe).toHaveBeenCalledWith({
        userVisibleOnly: true,
        applicationServerKey: expect.any(Uint8Array),
      })

      expect(fetch).toHaveBeenCalledWith(
        `${process.env.BASE_URL}/api/subscription/`,
        {
          method: "POST",
          body: JSON.stringify({ subscription: "HI" }),
          headers: {
            "Content-Type": "application/json",
          },
        }
      )
    })

    test("subscription id is saved on first subscription change", async () => {
      initWorker(self)

      const changeHandler = getHandler("pushsubscriptionchange")

      const changeEvent = createEvent()
      changeHandler(changeEvent)
      await waitUntilCalls(changeEvent)

      expect(await getSavedSubscription()).toEqual({
        id: 1,
        subscriptionId: 123,
      })
    })
  })

  function getHandler(eventName: string) {
    expect(self.addEventListener).toHaveBeenCalledWith(
      eventName,
      expect.anything()
    )

    const [, handler] = (self.addEventListener as jest.Mock).mock.calls.find(
      ([event]: [string]) => event === eventName
    )

    return handler
  }
})

async function getSavedSubscription() {
  const database = new Dexie("tack-up-now", { indexedDB }) as Dexie & {
    subscriptions: EntityTable<{ id: number; subscriptionId: number }, "id">
  }

  database.version(1).stores({ subscriptions: "id++, subscriptionId&" })

  return (await database.subscriptions.toArray())[0]
}

async function setSavedSubscription(subscriptionId: number) {
  const database = new Dexie("tack-up-now", { indexedDB }) as Dexie & {
    subscriptions: EntityTable<{ id: number; subscriptionId: number }, "id">
  }

  database.version(1).stores({ subscriptions: "id++, subscriptionId&" })

  await database.subscriptions.put({ id: 1, subscriptionId })
}

function createPushEvent(data: string) {
  const pushFields = {
    data: {
      blob: () => new Blob([data], { type: "text/plain" }),
      json: () => JSON.parse(data),
      text: () => data,
      arrayBuffer: () => new TextEncoder().encode(data),
    },
  }

  return createEvent(pushFields)
}

function createMessageEvent(message: any) {
  return createEvent({ data: message })
}

function createEvent(properties?: object) {
  return {
    waitUntil: jest.fn(),
    ...properties,
  }
}

function waitUntilCalls(event: {
  waitUntil: jest.Mock<void, Parameters<ExtendableEvent["waitUntil"]>>
}) {
  return Promise.all(event.waitUntil.mock.calls.map(([promise]) => promise))
}