import { describe, it, expect, vi, beforeEach } from 'vitest'
import { mount } from '@vue/test-utils'
import { createPinia, setActivePinia } from 'pinia'
import { createRouter, createMemoryHistory } from 'vue-router'
import EditOrderPage from '@/pages/EditOrderPage.vue'
import PaymentRedirect from '@/pages/PaymentRedirect.vue'

vi.mock('@/api/orders', () => ({
  fetchOrder: vi.fn(),
  updateOrder: vi.fn(),
}))

import { fetchOrder, updateOrder } from '@/api/orders'

const mockFetchOrder = vi.mocked(fetchOrder)
const mockUpdateOrder = vi.mocked(updateOrder)

const pendingOrder = {
  id: 'c2eebc99-9c0b-4ef8-bb6d-6bb9bd380a12',
  plate: 'DEF456',
  letterText: 'Vill köpa din bil.',
  status: 'pending_payment',
  trackingId: null,
  amountPaid: null,
  createdAt: '2026-05-14T13:00:00Z',
}

function createTestRouter() {
  return createRouter({
    history: createMemoryHistory(),
    routes: [
      {
        path: '/orders',
        name: 'orders',
        component: { template: '<div>Orders</div>' },
      },
      {
        path: '/bestallning/:orderId/redigera',
        name: 'edit-order',
        component: EditOrderPage,
      },
      {
        path: '/betalning/:orderId',
        name: 'payment',
        component: PaymentRedirect,
      },
    ],
  })
}

async function mountPage(orderId = pendingOrder.id) {
  const pinia = createPinia()
  setActivePinia(pinia)

  const router = createTestRouter()
  await router.push({ name: 'edit-order', params: { orderId } })
  await router.isReady()

  const wrapper = mount(EditOrderPage, {
    global: {
      plugins: [router, pinia],
    },
  })

  return { wrapper, router }
}

describe('EditOrderPage', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    mockFetchOrder.mockResolvedValue(pendingOrder)
    mockUpdateOrder.mockResolvedValue(pendingOrder)
  })

  it('shows loading state while fetching', async () => {
    mockFetchOrder.mockImplementation(() => new Promise(() => {}))
    const { wrapper } = await mountPage()
    expect(wrapper.text()).toContain('Laddar beställning...')
  })

  it('loads order and pre-fills textarea', async () => {
    const { wrapper } = await mountPage()
    await vi.waitFor(() => {
      expect(mockFetchOrder).toHaveBeenCalledWith(pendingOrder.id)
    })

    const textarea = wrapper.find('textarea')
    expect(textarea.element.value).toBe('Vill köpa din bil.')
    expect(wrapper.text()).toContain('DEF456')
    expect(wrapper.text()).toContain('Redigera brev')
  })

  it('shows error when order is not pending_payment', async () => {
    mockFetchOrder.mockResolvedValue({
      ...pendingOrder,
      status: 'sent',
    })

    const { wrapper } = await mountPage()
    await vi.waitFor(() => {
      expect(wrapper.text()).toContain(
        'Den här beställningen kan inte redigeras',
      )
    })

    expect(wrapper.find('textarea').exists()).toBe(false)
    expect(wrapper.text()).toContain('Tillbaka till beställningar')
  })

  it('submit calls updateOrder and navigates to payment', async () => {
    const { wrapper, router } = await mountPage()
    await vi.waitFor(() => {
      expect(wrapper.find('textarea').exists()).toBe(true)
    })

    const textarea = wrapper.find('textarea')
    await textarea.setValue('Uppdaterat meddelande')
    const button = wrapper.find('button[type="submit"]')
    await button.trigger('submit')

    await vi.waitFor(() => {
      expect(mockUpdateOrder).toHaveBeenCalledWith(
        pendingOrder.id,
        'Uppdaterat meddelande',
      )
      expect(router.currentRoute.value.name).toBe('payment')
      expect(router.currentRoute.value.params.orderId).toBe(pendingOrder.id)
      expect(router.currentRoute.value.query.plate).toBe('DEF456')
    })
  })

  it('shows error message on update failure', async () => {
    mockUpdateOrder.mockRejectedValue(new Error('Network error'))

    const { wrapper } = await mountPage()
    await vi.waitFor(() => {
      expect(wrapper.find('textarea').exists()).toBe(true)
    })

    const textarea = wrapper.find('textarea')
    await textarea.setValue('Uppdaterat meddelande')
    const button = wrapper.find('button[type="submit"]')
    await button.trigger('submit')

    await vi.waitFor(() => {
      expect(wrapper.text()).toContain('Kunde inte spara ändringarna')
    })
  })
})