import type { Page } from 'playwright'

export interface ApiMock {
	status: number
	body?: unknown
	headers?: Record<string, string>
	hang?: boolean
}

export interface VisualState {
	path: string
	api?: Record<string, ApiMock>
	steps?: (page: Page) => Promise<void>
}

const registrationClosed: ApiMock = { status: 200, body: { open: false } }
const registrationOpen: ApiMock = { status: 200, body: { open: true } }

async function fillLogin(page: Page, username: string, password: string) {
	await page.getByPlaceholder('Your username').fill(username)
	await page.locator('input[autocomplete="current-password"]').fill(password)
}

function submitLogin(username: string, password: string) {
	return async (page: Page) => {
		await fillLogin(page, username, password)
		await page.getByRole('button', { name: 'Log in', exact: true }).click()
	}
}

function loginWith(response: ApiMock, path = '/login'): Omit<VisualState, 'steps'> {
	return {
		path,
		api: {
			'GET /v1/auth/registration': registrationClosed,
			'POST /v1/auth/login': response,
		},
	}
}

async function fillRegister(page: Page, username: string, email: string, password: string) {
	await page.getByPlaceholder('e.g. marta').fill(username)
	await page.getByPlaceholder('e.g. marta').blur()
	await page.getByPlaceholder('you@example.com').fill(email)
	await page.getByPlaceholder('you@example.com').blur()
	await page.locator('input[autocomplete="new-password"]').fill(password)
	await page.locator('input[autocomplete="new-password"]').blur()
}

function registerWith(response: ApiMock): Omit<VisualState, 'steps'> {
	return {
		path: '/register',
		api: {
			'POST /v1/auth/register': response,
		},
	}
}

function submitRegister(username: string, email: string, password: string) {
	return async (page: Page) => {
		await fillRegister(page, username, email, password)
		await page.getByRole('button', { name: 'Create account', exact: true }).click()
	}
}

export const visualStates: Record<string, Record<string, VisualState>> = {
	'log-in': {
		Default: { path: '/login', api: { 'GET /v1/auth/registration': registrationClosed } },
		'Fresh install': { path: '/login', api: { 'GET /v1/auth/registration': registrationOpen } },
		'Validation errors': {
			...loginWith({ status: 500 }),
			steps: submitLogin('ma', ''),
		},
		Submitting: {
			...loginWith({ status: 200, hang: true }),
			steps: submitLogin('marta', 'limewash2026'),
		},
		'Wrong credentials (403)': {
			...loginWith({ status: 403, body: 'forbidden' }),
			steps: submitLogin('marta', 'limewash2026'),
		},
		'Too many attempts (429)': {
			...loginWith({ status: 429, headers: { 'Retry-After': '42' } }),
			steps: submitLogin('marta', 'limewash'),
		},
		'Session expired': {
			...loginWith({ status: 500 }, '/login?redirect=/article/12/edit&reason=expired'),
			steps: async (page) => {
				await page.getByPlaceholder('Your username').fill('marta')
				await page.locator('input[autocomplete="current-password"]').focus()
			},
		},
		'Password changed': {
			path: '/login?reason=password-changed',
			api: { 'GET /v1/auth/registration': registrationClosed },
		},
		'Server or network error': {
			...loginWith({ status: 500 }),
			steps: submitLogin('marta', 'limewash2026'),
		},
	},
	register: {
		Default: { path: '/register' },
		'Validation errors': {
			path: '/register',
			steps: async (page) => {
				await fillRegister(page, 'ma', 'marta@renew', 'lime')
			},
		},
		'Filled, valid': {
			path: '/register',
			steps: async (page) => {
				await fillRegister(page, 'marta', 'marta@renew.example', 'limewash2026')
				await page.getByRole('button', { name: 'Show password' }).click()
			},
		},
		Submitting: {
			...registerWith({ status: 200, hang: true }),
			steps: submitRegister('marta', 'marta@renew.example', 'limewash2026'),
		},
		'Registration closed (403)': {
			...registerWith({ status: 403 }),
			steps: submitRegister('marta', 'marta@renew.example', 'limewash2026'),
		},
		'Server error': {
			...registerWith({ status: 500 }),
			steps: submitRegister('marta', 'marta@renew.example', 'limewash2026'),
		},
	},
}