import EventEmitter from "events"
import { describe, expect, it, vi, beforeEach, afterEach } from "vitest"
import { isRelayUrl } from "@welshman/util"
import { LocalRelay, Repository, LOCAL_RELAY_URL } from "@welshman/relay"
import { AdapterEvent, SocketAdapter, LocalAdapter, getAdapter } from "../src/adapter"
import { ClientMessage, RelayMessage } from "../src/message"
import { Socket, SocketEvent } from "../src/socket"
import { Pool } from "../src/pool"

vi.mock('isomorphic-ws', () => {
  const WebSocket = vi.fn(function (this: any) {
    setTimeout(() => this.onopen())
  })

  WebSocket.prototype.send = vi.fn()

  WebSocket.prototype.close = vi.fn(function (this: any) {
    this.onclose()
  })

  return { default: WebSocket }
})

describe("SocketAdapter", () => {
  let socket: Socket
  let adapter: SocketAdapter

  beforeEach(() => {
    vi.useFakeTimers()
    socket = new Socket('wss://test.relay')
    adapter = new SocketAdapter(socket)
  })

  afterEach(() => {
    vi.clearAllMocks()
    vi.useRealTimers()
    socket.cleanup()
    adapter.cleanup()
  })

  it("should initialize with correct socket", () => {
    expect(adapter.socket).toBe(socket)
    expect(adapter.urls).toEqual(["wss://test.relay"])
    expect(adapter.sockets).toEqual([socket])
  })

  it("should forward received messages", () => {
    const receiveSpy = vi.fn()
    adapter.on(AdapterEvent.Receive, receiveSpy)

    const message: RelayMessage = ["EVENT", "123", { id: "123", kind: 1 }]
    socket.emit(SocketEvent.Receive, message, "wss://test.relay")

    expect(receiveSpy).toHaveBeenCalledWith(message, "wss://test.relay")
  })

  it("should send messages to socket", () => {
    const sendSpy = vi.spyOn(socket, 'send')
    const message: ClientMessage = ["EVENT", { id: "123", kind: 1 }]
    adapter.send(message)

    expect(sendSpy).toHaveBeenCalledWith(message)
  })

  it("should cleanup properly", () => {
    const removeListenersSpy = vi.spyOn(adapter, "removeAllListeners")
    adapter.cleanup()
    expect(removeListenersSpy).toHaveBeenCalled()
  })
})

describe("LocalAdapter", () => {
  let relay: LocalRelay & EventEmitter
  let adapter: LocalAdapter

  beforeEach(() => {
    const mockRelay = new EventEmitter()
    Object.assign(mockRelay, {
      send: vi.fn(),
      removeAllListeners: vi.fn()
    })
    relay = mockRelay as unknown as LocalRelay & EventEmitter
    adapter = new LocalAdapter(relay)
  })

  afterEach(() => {
    adapter.cleanup()
    vi.clearAllMocks()
  })

  it("should initialize with correct relay", () => {
    expect(adapter.relay).toBe(relay)
    expect(adapter.urls).toEqual([LOCAL_RELAY_URL])
    expect(adapter.sockets).toEqual([])
  })

  it("should forward received messages", () => {
    const receiveSpy = vi.fn()
    adapter.on(AdapterEvent.Receive, receiveSpy)

    const message: RelayMessage = ["EVENT", "123", { id: "123", kind: 1 }]
    relay.emit("*", ...message)

    expect(receiveSpy).toHaveBeenCalledWith(message, LOCAL_RELAY_URL)
  })

  it("should send messages to relay", () => {
    const message: ClientMessage = ["EVENT", { id: "123", kind: 1 }]
    adapter.send(message)

    expect(relay.send).toHaveBeenCalledWith("EVENT", message[1])
  })

  it("should cleanup properly", () => {
    const removeListenersSpy = vi.spyOn(adapter, "removeAllListeners")
    adapter.cleanup()
    expect(removeListenersSpy).toHaveBeenCalled()
  })
})

describe("getAdapter", () => {
  let pool: Pool
  let repository: Repository

  beforeEach(() => {
    pool = new Pool({
      makeSocket: () => new Socket("wss://test.relay"),
    })

    repository = new Repository()
  })

  afterEach(() => {
    vi.clearAllMocks()
  })

  it("should return LocalAdapter for local relay URL", () => {
    const url = LOCAL_RELAY_URL
    const adapter = getAdapter(url, { repository })
    expect(adapter).toBeInstanceOf(LocalAdapter)
  })

  it("should return SocketAdapter for remote relay URL", () => {
    const url = "wss://test.relay"
    const adapter = getAdapter(url, { pool })
    expect(adapter).toBeInstanceOf(SocketAdapter)
  })

  it("should use custom adapter if provided", () => {
    const customAdapter = new SocketAdapter(new Socket("wss://test.relay"))
    const getCustomAdapter = vi.fn().mockReturnValue(customAdapter)
    const url = "wss://test.relay"

    const adapter = getAdapter(url, { getAdapter: getCustomAdapter })

    expect(getCustomAdapter).toHaveBeenCalledWith(url, expect.objectContaining({ getAdapter: getCustomAdapter }))
    expect(adapter).toBe(customAdapter)
  })
})