import { describe, it, expect, afterEach, beforeEach } from 'vitest'
import { mount, flushPromises } from '@vue/test-utils'
import { createPinia, setActivePinia } from 'pinia'
import uiPlugin from '@nuxt/ui/vue-plugin'
import router from '@/router'
import AuthShell from '@/components/AuthShell.vue'
import LoginView from '@/views/LoginView.vue'
import { resetAuthShellNavigation } from '@/composables/useAuthShellNavigation'

function stubMatchMedia(belowSm: boolean) {
	window.matchMedia = ((query: string) => ({
		matches: belowSm,
		media: query,
		onchange: null,
		addEventListener: () => {},
		removeEventListener: () => {},
		addListener: () => {},
		removeListener: () => {},
		dispatchEvent: () => false,
	})) as unknown as typeof window.matchMedia
}

function mockResponse(status: number, body: unknown = null) {
	return {
		ok: status >= 200 && status < 300,
		status,
		headers: { get: () => null },
		json: async () => body,
	} as unknown as Response
}

let currentWrapper: Awaited<ReturnType<typeof mount>> | null = null

async function mountLogin(path = '/login') {
	setActivePinia(createPinia())
	global.fetch = (() =>
		mockResponse(200, { open: false })) as unknown as typeof fetch
	await router.push(path)
	const wrapper = mount(LoginView, {
		attachTo: document.body,
		global: { plugins: [router, uiPlugin] },
	})
	currentWrapper = wrapper
	await flushPromises()
	return wrapper
}

beforeEach(() => {
	resetAuthShellNavigation()
})

afterEach(async () => {
	currentWrapper?.unmount()
	currentWrapper = null
	await router.push('/login')
	resetAuthShellNavigation()
})

describe('"Forgot password?" is underlined and muted', () => {
	it('uses the muted toned color, underline and 3px offset, no other emphasis', async () => {
		const wrapper = await mountLogin()

		const link = wrapper.find('a[href="/register/reset/request"]')
		expect(link.classes()).toContain('text-toned')
		expect(link.classes()).toContain('underline')
		expect(link.classes()).toContain('underline-offset-[3px]')
		expect(link.classes()).not.toContain('text-primary')
		expect(link.classes()).not.toContain('font-bold')
		expect(link.classes()).not.toContain('font-semibold')
	})
})

describe('A field error shows the circle-alert icon with no extra focus halo', () => {
	it('precedes both field errors with the error-colored icon, and keeps a single error ring when focused', async () => {
		const wrapper = await mountLogin()

		await wrapper.find('input[placeholder="Your username"]').setValue('ma')
		await wrapper.find('form').trigger('submit')
		await flushPromises()

		const fieldRoots = wrapper.findAll(
			'[data-slot="root"][data-orientation]',
		)
		const usernameError = fieldRoots[0]!.find('[data-slot="error"]')
		const passwordError = fieldRoots[1]!.find('[data-slot="error"]')

		for (const error of [usernameError, passwordError]) {
			const icon = error.find('svg')
			expect(icon.exists()).toBe(true)
			expect(icon.html()).toContain('M12 8v4m0 4h.01')
			expect(icon.classes()).toContain('text-error')
		}

		const usernameInput = wrapper.find('input[placeholder="Your username"]')
		await usernameInput.trigger('focus')

		expect(usernameInput.classes()).toContain('ring-error')
		expect(usernameInput.classes()).toContain('focus-visible:ring-error')
		expect(usernameInput.classes()).not.toContain('ring-primary')
		expect(usernameInput.classes()).not.toContain(
			'focus-visible:ring-primary',
		)
	})
})

describe('The theme select is right-aligned in the footer with no chevron', () => {
	it('renders as the last child, showing only the mode icon and label', async () => {
		stubMatchMedia(false)
		const wrapper = await mountLogin()

		const footer = wrapper.find('footer')
		const select = footer.find('button[aria-haspopup="listbox"]')
		expect(select.exists()).toBe(true)

		const children = Array.from(footer.element.children)
		expect(children[children.length - 1]).toBe(select.element)

		expect(select.text()).toContain('System')

		const trailing = select.find('[data-slot="trailing"]')
		expect(trailing.classes()).toContain('hidden')
	})
})

describe('The alert renders inside the card, under the description', () => {
	it.each([
		{
			path: '/login?redirect=/article/12/edit&reason=expired',
			state: 'Session expired',
			text: 'Your session expired',
		},
		{
			path: '/login?reason=password-changed',
			state: 'Password changed',
			text: 'Password changed',
		},
	])(
		'places the $state alert inside the card, after the title/description, before Username',
		async ({ path, text }) => {
			const wrapper = await mountLogin(path)

			const card = wrapper.find('[data-testid="auth-card"]')
			const alerts = wrapper.findAll('[role="alert"], [role="status"]')
			expect(alerts.length).toBe(1)
			const alert = alerts[0]!
			expect(card.element.contains(alert.element)).toBe(true)
			expect(alert.text()).toContain(text)

			const rootsInCard = card.findAll(
				'[data-slot="root"][data-orientation]',
			)
			expect(
				rootsInCard.some((root) =>
					root.classes().includes('bg-primary'),
				),
			).toBe(false)

			const usernameInput = wrapper.find(
				'input[placeholder="Your username"]',
			)
			const html = card.html()
			expect(html.indexOf('Welcome back')).toBeGreaterThan(-1)
			expect(html.indexOf('Welcome back')).toBeLessThan(
				html.indexOf(text),
			)
			expect(html.indexOf(text)).toBeLessThan(html.indexOf('Username'))
			expect(card.element.contains(usernameInput.element)).toBe(true)

			expect(
				alert
					.classes()
					.some((c) => /^bg-\(--rc-(info|success)-soft\)$/.test(c)),
			).toBe(true)
		},
	)
})

describe('The h1 is not focused on first load', () => {
	it('leaves focus on the document body after AuthShell mounts', () => {
		const wrapper = mount(AuthShell, {
			props: { title: 'Log in', description: 'Welcome back.' },
			attachTo: document.body,
			global: { plugins: [uiPlugin] },
		})

		const heading = wrapper.find('h1')
		expect(heading.element).not.toBe(document.activeElement)
		wrapper.unmount()
	})
})

describe('Focus moves to the h1 only on an in-app navigation between public screens', () => {
	it('does not focus the first AuthShell mount, but focuses the second', () => {
		const first = mount(AuthShell, {
			props: { title: 'Log in', description: 'Welcome back.' },
			attachTo: document.body,
			global: { plugins: [uiPlugin] },
		})
		expect(first.find('h1').element).not.toBe(document.activeElement)
		first.unmount()

		const second = mount(AuthShell, {
			props: { title: 'Forgot password?', description: 'Reset it.' },
			attachTo: document.body,
			global: { plugins: [uiPlugin] },
		})

		expect(second.find('h1').element).toBe(document.activeElement)
		expect(second.find('h1').classes()).toContain('outline-none')
		second.unmount()
	})
})