import { afterEach, describe, expect, it, vi } 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 { useSessionStore } from '@/stores/session'
import RootComponent from '@/App.vue'
import ArticleEditor from '@/components/ArticleEditor.vue'

vi.mock('@nuxt/ui/composables', () => ({
	useOverlay: () => ({ create: () => ({ open: () => Promise.resolve(false) }) }),
	useToast: () => ({ add: vi.fn() }),
}))

const emptyRectList = () => Object.assign([], { item: () => null }) as unknown as DOMRectList

Range.prototype.getClientRects = emptyRectList
Range.prototype.getBoundingClientRect = () => new DOMRect()

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 mountArticleEditor(body = '<p>Hello</p>') {
	setActivePinia(createPinia())
	const session = useSessionStore()
	session.session = { verified: true, username: 'marta' }
	session.status = 'ready'
	global.fetch = vi.fn(() =>
		Promise.resolve(
			mockResponse(200, {
				id: 12,
				title: 'T',
				body,
				is_online: false,
				created_at: '2026-01-01T00:00:00Z',
				updated_at: '2026-01-01T00:00:00Z',
			}),
		),
	) as unknown as typeof fetch
	await router.push('/article/12/edit')
	const wrapper = mount(RootComponent, {
		attachTo: document.body,
		global: { plugins: [router, uiPlugin] },
	})
	currentWrapper = wrapper
	await flushPromises()
	return wrapper
}

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

describe('the alignment toolbar buttons align the current block', () => {
	const ALIGNMENTS = ['left', 'center', 'right', 'justify']
	const FIRST_ALIGN_BUTTON = 7

	function alignButton(name: string) {
		const buttons = document.body.querySelectorAll<HTMLButtonElement>('.article-editor button')
		return buttons[FIRST_ALIGN_BUTTON + ALIGNMENTS.indexOf(name)] ?? null
	}

	it.each(ALIGNMENTS)('keeps the %s button enabled', async (name) => {
		await mountArticleEditor()

		const button = alignButton(name)

		expect(button).not.toBeNull()
		expect(button?.disabled).toBe(false)
	})

	it('writes the alignment into the body when a button is clicked', async () => {
		const wrapper = await mountArticleEditor()
		const editor = wrapper.findComponent(ArticleEditor)

		alignButton('center')?.click()
		await flushPromises()

		expect(editor.props('modelValue')).toContain('text-align: center')
	})
})

describe('insertImage stamps the inserted image with its numeric id', () => {
	it('renders data-image-id on the img and emits the updated body', async () => {
		const wrapper = await mountArticleEditor()
		const editor = wrapper.findComponent(ArticleEditor)

		;(
			editor.vm as unknown as { insertImage: (src: string, alt: string, id: number) => void }
		).insertImage('/static/uploadedImages/photo.png', 'alt text', 10)
		await flushPromises()

		expect(editor.props('modelValue')).toContain(
			'<img src="/static/uploadedImages/photo.png" alt="alt text" data-image-id="10">',
		)
	})
})

describe('removeImage removes only the node whose data-image-id matches', () => {
	it('deletes the matching image node and leaves the rest of the content', async () => {
		const wrapper = await mountArticleEditor()
		const editor = wrapper.findComponent(ArticleEditor)
		const vm = editor.vm as unknown as {
			insertImage: (src: string, alt: string, id: number) => void
			removeImage: (id: number) => void
		}

		vm.insertImage('/static/uploadedImages/a.png', '', 10)
		await flushPromises()
		vm.insertImage('/static/uploadedImages/b.png', '', 11)
		await flushPromises()

		vm.removeImage(10)
		await flushPromises()

		const body = editor.props('modelValue') as string
		expect(body).not.toContain('data-image-id="10"')
		expect(body).toContain('data-image-id="11"')
	})

	it('does nothing when no image carries the given id', async () => {
		const wrapper = await mountArticleEditor('<p>Hello</p>')
		const editor = wrapper.findComponent(ArticleEditor)
		const vm = editor.vm as unknown as { removeImage: (id: number) => void }

		vm.removeImage(999)
		await flushPromises()

		expect(editor.emitted('update:modelValue')).toBeFalsy()
	})
})

describe('imageSrc reads the src of the node whose data-image-id matches', () => {
	it('returns the src of the matching image and null for an unknown id', async () => {
		const wrapper = await mountArticleEditor(
			'<p>Hello</p><img src="/static/uploadedImages/a.png" alt="" data-image-id="10">',
		)
		const vm = wrapper.findComponent(ArticleEditor).vm as unknown as {
			imageSrc: (id: number) => string | null
		}

		expect(vm.imageSrc(10)).toBe('/static/uploadedImages/a.png')
		expect(vm.imageSrc(999)).toBeNull()
	})
})