import { afterEach, beforeEach, describe, expect, it } from 'vitest'
import { mount, flushPromises } from '@vue/test-utils'
import uiPlugin from '@nuxt/ui/vue-plugin'
import UserMenu from '../UserMenu.vue'
import { useColorMode } from '@/composables/useColorMode'

function mountMenu(props: { username: string; collapsed: boolean }) {
	return mount(UserMenu, {
		attachTo: document.body,
		props,
		global: {
			plugins: [uiPlugin],
		},
	})
}

function findTriggerButton() {
	return document.body.querySelector('button')
}

async function openMenu() {
	findTriggerButton()?.click()
	await flushPromises()
}

function findMenuItemsByRole(role: string) {
	return Array.from(document.body.querySelectorAll(`[role="${role}"]`))
}

function findCheckboxItem(label: string) {
	return findMenuItemsByRole('menuitemcheckbox').find(
		(el) => el.textContent?.trim() === label,
	)
}

beforeEach(() => {
	localStorage.clear()
	document.documentElement.classList.remove('dark', 'light')
})

afterEach(() => {
	document.body.innerHTML = ''
})

describe("UserMenu's dropdown lists the account label, color-mode checkboxes, then Log out", () => {
	it('shows avatar initials MA, the username, and the three ordered groups', async () => {
		const wrapper = mountMenu({ username: 'marta', collapsed: false })

		const avatar = document.body.querySelector('[data-slot="fallback"]')
		expect(avatar?.textContent).toBe('MA')
		expect(avatar?.getAttribute('aria-hidden')).toBe('true')
		expect(wrapper.text()).toContain('marta')

		await openMenu()

		const groups = findMenuItemsByRole('group')
		expect(groups.length).toBe(3)

		expect(groups[0].textContent).toContain('marta')

		const checkboxLabels = findMenuItemsByRole('menuitemcheckbox').map(
			(el) => el.textContent?.trim(),
		)
		expect(checkboxLabels).toEqual(['System', 'Light', 'Dark'])

		expect(groups[2].textContent?.trim()).toBe('Log out')

		wrapper.unmount()
	})

	it('derives initials from the first letter of the first two words for a multi-word username', () => {
		const wrapper = mountMenu({ username: 'jane doe', collapsed: false })

		const avatar = document.body.querySelector('[data-slot="fallback"]')
		expect(avatar?.textContent).toBe('JD')

		wrapper.unmount()
	})

	it('checks exactly the item matching the current color-mode preference', async () => {
		const colorMode = useColorMode()
		colorMode.preference = 'dark'

		const wrapper = mountMenu({ username: 'marta', collapsed: false })
		await openMenu()

		expect(findCheckboxItem('Dark')?.getAttribute('aria-checked')).toBe(
			'true',
		)
		expect(findCheckboxItem('Light')?.getAttribute('aria-checked')).toBe(
			'false',
		)
		expect(findCheckboxItem('System')?.getAttribute('aria-checked')).toBe(
			'false',
		)

		wrapper.unmount()
	})
})

describe('Selecting a color-mode item updates the preference and its checked state', () => {
	it.each([
		['system', 'light'],
		['light', 'dark'],
		['dark', 'system'],
	])('moves from %s to %s', async (from, to) => {
		const colorMode = useColorMode()
		colorMode.preference = from as 'system' | 'light' | 'dark'

		const wrapper = mountMenu({ username: 'marta', collapsed: false })
		await openMenu()

		const label = to.charAt(0).toUpperCase() + to.slice(1)
		const fromLabel = from.charAt(0).toUpperCase() + from.slice(1)

		findCheckboxItem(label)?.dispatchEvent(
			new MouseEvent('pointerup', { bubbles: true }),
		)
		findCheckboxItem(label)?.dispatchEvent(
			new MouseEvent('click', { bubbles: true }),
		)
		await flushPromises()

		expect(colorMode.preference).toBe(to)

		await openMenu()
		expect(findCheckboxItem(label)?.getAttribute('aria-checked')).toBe(
			'true',
		)
		expect(findCheckboxItem(fromLabel)?.getAttribute('aria-checked')).toBe(
			'false',
		)

		wrapper.unmount()
	})
})

describe('A successful logout clears the session and navigates to /login', () => {
	it('emits logout when the user activates Log out', async () => {
		const wrapper = mountMenu({ username: 'marta', collapsed: false })
		await openMenu()

		const logOutItem = Array.from(
			document.body.querySelectorAll('[role="menuitem"]'),
		).find((el) => el.textContent?.trim() === 'Log out')
		;(logOutItem as HTMLElement)?.click()
		await flushPromises()

		expect(wrapper.emitted('logout')).toBeTruthy()

		wrapper.unmount()
	})
})

describe('Collapsed sidebar hides the wordmark and username text but keeps an accessible name', () => {
	it('hides the visible username but keeps it in the accessible name, and opens the same dropdown', async () => {
		const wrapper = mountMenu({ username: 'marta', collapsed: true })

		expect(wrapper.text()).not.toContain('marta')
		expect(findTriggerButton()?.getAttribute('aria-label')).toBe(
			'marta — account menu',
		)
		expect(
			document.body.querySelector('[data-slot="fallback"]')?.textContent,
		).toBe('MA')

		await openMenu()

		const groups = findMenuItemsByRole('group')
		expect(groups.length).toBe(3)
		expect(groups[0].textContent).toContain('marta')

		wrapper.unmount()
	})
})