import { type VueWrapper, mount } from '@vue/test-utils'
import { createTestingPinia } from '@pinia/testing'
import type { TestingPinia } from '@pinia/testing'
import { QueryClient, VueQueryPlugin } from '@tanstack/vue-query'
import { type RouteRecordRaw, type Router, createMemoryHistory, createRouter } from 'vue-router'
import { type ThemeDefinition, createVuetify } from 'vuetify'
import * as components from 'vuetify/components'
import * as directives from 'vuetify/directives'
import { vi } from 'vitest'
import type { Component } from 'vue'

// Plain-CSS token sheet — JSDOM evaluates :root custom properties from this
// import so getComputedStyle(el).getPropertyValue('--tt-status-…') resolves
// during component tests. Path resolved by vitest.config alias `@`.
import '@/styles/tokens/_timetable.css'

/**
 * Notification mock matching the actual store API:
 *   useNotificationStore().show(message, type, duration)
 * (See apps/app/src/stores/useNotificationStore.ts)
 */
export interface NotificationMock {
  show: ReturnType<typeof vi.fn>
  hide: ReturnType<typeof vi.fn>
}

export function createNotificationMock(): NotificationMock {
  return {
    show: vi.fn(),
    hide: vi.fn(),
  }
}

export interface MountWithVuexyOptions {

  /** Routes to register on the test router. Default: a single catch-all. */
  routes?: RouteRecordRaw[]

  /** Initial path the router opens at. Default: '/'. */
  initialPath?: string

  /** Initial query string params. */
  initialQuery?: Record<string, string>

  /** Initial Pinia store state (per-store map, see @pinia/testing docs). */
  initialState?: Record<string, Record<string, unknown>>

  /** Override the default fresh QueryClient (useful for prefilled caches). */
  queryClient?: QueryClient

  /** Provide a custom notification mock; default `createNotificationMock()`. */
  notificationMock?: NotificationMock

  /**
   * Set to `true` to use createTestingPinia's default action stubbing (every
   * action becomes a vi.fn that does nothing). Default `false` — actions
   * still execute so component tests exercise real store behaviour.
   */
  stubActions?: boolean

  /** props forwarded to mount(). */
  props?: Record<string, unknown>

  /** Slots for mount(). */
  slots?: Record<string, unknown>

  /** Optional global stubs. */
  stubs?: Record<string, Component | boolean>
}

export interface MountWithVuexyResult {
  wrapper: VueWrapper
  router: Router
  pinia: TestingPinia
  queryClient: QueryClient
  notificationMock: NotificationMock
}

const defaultTheme: ThemeDefinition = {
  dark: false,
  colors: {
    primary: '#1f7ad1',
    error: '#d63d4b',
    success: '#2fa66a',
    warning: '#e0992c',
    info: '#1f7ad1',
  },
}

/**
 * Mounts a Vue component with the full Vuexy/Vuetify stack wired up:
 * - Vuetify (real components + directives, default theme tokens)
 * - Pinia (createTestingPinia — actions execute by default)
 * - TanStack Vue Query (a fresh QueryClient per call — never shared)
 * - Vue Router (memory history, opens at `initialPath` with `initialQuery`)
 * - Notification store mocked at the Pinia layer
 *
 * Each call gets fresh instances of router, pinia, and queryClient — no
 * cross-test leakage. The notification mock is exposed so tests can assert
 * `expect(notificationMock.show).toHaveBeenCalledWith('…', 'error', …)`.
 */
export function mountWithVuexy(component: Component, options: MountWithVuexyOptions = {}): MountWithVuexyResult {
  const {
    routes = [{ path: '/', component: { template: '<div />' } }, { path: '/:pathMatch(.*)*', component: { template: '<div />' } }],
    initialPath = '/',
    initialQuery,
    initialState = {},
    queryClient = new QueryClient({ defaultOptions: { queries: { retry: false }, mutations: { retry: false } } }),
    notificationMock = createNotificationMock(),
    stubActions = false,
    props,
    slots,
    stubs,
  } = options

  const router = createRouter({ history: createMemoryHistory(), routes })

  // Patch the notification store via initialState so any useNotificationStore()
  // call resolves to the mock fns. Pinia testing replaces actions when
  // stubActions=true; here we override the action surface explicitly so the
  // mock is consistent regardless of stubActions.
  const pinia = createTestingPinia({
    stubActions,
    initialState: {
      ...initialState,
      notification: {
        visible: false,
        message: '',
        type: 'info',
        timeout: 5000,
        ...(initialState.notification ?? {}),
      },
    },
    createSpy: vi.fn,
  })

  // Bind the notification action mocks into the store. We do this AFTER
  // createTestingPinia so the store is registered.
  pinia.use(({ store }) => {
    if (store.$id === 'notification') {
      store.show = notificationMock.show
      store.hide = notificationMock.hide
    }
  })

  const vuetify = createVuetify({
    components,
    directives,
    theme: { defaultTheme: 'crewliLight', themes: { crewliLight: defaultTheme } },
  })

  const navigatePromise = (async () => {
    if (initialQuery)
      await router.push({ path: initialPath, query: initialQuery })
    else
      await router.push(initialPath)
    await router.isReady()
  })()

  const wrapper = mount(component, {
    props,
    slots,
    global: {
      plugins: [
        vuetify,
        pinia,
        router,
        [VueQueryPlugin, { queryClient }],
      ],
      stubs,
    },
  })

  // The router push above is fire-and-forget; consumers that need the route
  // to be settled before the first assertion should `await wrapper.vm.$nextTick()`
  // a couple of times after mount. We attach the promise so tests can await it.
  ;(wrapper as unknown as { __routerReady: Promise<void> }).__routerReady = navigatePromise

  return { wrapper, router, pinia, queryClient, notificationMock }
}