import { describe, expect, it, vi } from "vitest"
import {
  loadJson,
  performIfChanged,
  removeKey,
  saveJson
} from "match-state-transport"

describe("match state transport", () => {
  it("loads saved json from storage", () => {
    const storage = {
      getItem: vi.fn(() => '{"score":3}')
    }

    expect(loadJson(storage, "match-state:1:1001")).toEqual({ score: 3 })
    expect(storage.getItem).toHaveBeenCalledWith("match-state:1:1001")
  })

  it("returns null when stored json is invalid", () => {
    const storage = {
      getItem: vi.fn(() => "{not-json")
    }

    expect(loadJson(storage, "bad")).toBe(null)
  })

  it("saves and removes json values in storage", () => {
    const storage = {
      setItem: vi.fn(),
      removeItem: vi.fn()
    }

    expect(saveJson(storage, "key", { score: 5 })).toBe(true)
    expect(storage.setItem).toHaveBeenCalledWith("key", '{"score":5}')

    expect(removeKey(storage, "key")).toBe(true)
    expect(storage.removeItem).toHaveBeenCalledWith("key")
  })

  it("only performs subscription actions when the payload changes", () => {
    const subscription = {
      perform: vi.fn()
    }

    const firstSerialized = performIfChanged(subscription, "send_stat", { new_w1_stat: "T3" }, null)
    const secondSerialized = performIfChanged(subscription, "send_stat", { new_w1_stat: "T3" }, firstSerialized)
    const thirdSerialized = performIfChanged(subscription, "send_stat", { new_w1_stat: "T3 E1" }, secondSerialized)

    expect(subscription.perform).toHaveBeenCalledTimes(2)
    expect(subscription.perform).toHaveBeenNthCalledWith(1, "send_stat", { new_w1_stat: "T3" })
    expect(subscription.perform).toHaveBeenNthCalledWith(2, "send_stat", { new_w1_stat: "T3 E1" })
    expect(firstSerialized).toBe('{"new_w1_stat":"T3"}')
    expect(secondSerialized).toBe(firstSerialized)
    expect(thirdSerialized).toBe('{"new_w1_stat":"T3 E1"}')
  })
})