import { LoaderFunctionArgs, ActionFunctionArgs } from '@remix-run/node'
import { useLoaderData } from '@remix-run/react'
import { useLiveData } from '~/utils/useLiveData'
import { getSession } from '~/utils/sessions'
import { Link as RemixLink } from '@remix-run/react'
import { PreAuthKey, User } from '~/types'
import { pull, post } from '~/utils/headscale'
import { loadContext } from '~/utils/config/headplane'
import { useState } from 'react'
import { send } from '~/utils/res'

import Link from '~/components/Link'
import TableList from '~/components/TableList'
import Select from '~/components/Select'
import Switch from '~/components/Switch'

import AddPreAuthKey from './dialogs/new'
import AuthKeyRow from './components/key'

export async function action({ request }: ActionFunctionArgs) {
	const session = await getSession(request.headers.get('Cookie'))
	if (!session.has('hsApiKey')) {
		return send({ message: 'Unauthorized' }, {
			status: 401,
		})
	}

	const data = await request.formData()

	// Expiring a pre-auth key
	if (request.method === 'DELETE') {
		const key = data.get('key')
		const user = data.get('user')

		if (!key || !user) {
			return send({ message: 'Missing parameters' }, {
				status: 400,
			})
		}

		await post<{ preAuthKey: PreAuthKey }>(
			'v1/preauthkey/expire',
			session.get('hsApiKey')!, 
			{
				user: user,
				key: key,
			}
		)

		return { message: 'Pre-auth key expired' }
	}

	// Creating a new pre-auth key
	if (request.method === 'POST') {
		const user = data.get('user')
		const expiry = data.get('expiry')
		const reusable = data.get('reusable')
		const ephemeral = data.get('ephemeral')

		if (!user || !expiry || !reusable || !ephemeral) {
			return send({ message: 'Missing parameters' }, {
				status: 400,
			})
		}

		// Extract the first "word" from expiry which is the day number
		// Calculate the date X days from now using the day number
		const day = Number(expiry.toString().split(' ')[0])
		const date = new Date()
		date.setDate(date.getDate() + day)

		const key = await post<{ preAuthKey: PreAuthKey }>(
			'v1/preauthkey',
			session.get('hsApiKey')!, 
			{
				user: user,
				ephemeral: ephemeral === 'on',
				reusable: reusable === 'on',
				expiration: date.toISOString(),
				aclTags: [], // TODO
			}
		)

		return { message: 'Pre-auth key created', key }
	}
}

export async function loader({ request }: LoaderFunctionArgs) {
	const context = await loadContext()
	const session = await getSession(request.headers.get('Cookie'))
	const users = await pull<{ users: User[] }>('v1/user', session.get('hsApiKey')!)

	const preAuthKeys = await Promise.all(users.users.map(user => {
		const qp = new URLSearchParams()
		qp.set('user', user.name)

		return pull<{ preAuthKeys: PreAuthKey[] }>(
			`v1/preauthkey?${qp.toString()}`,
			session.get('hsApiKey')!
		)
	}))

	return {
		keys: preAuthKeys.flatMap(keys => keys.preAuthKeys),
		users: users.users,
		server: context.headscalePublicUrl ?? context.headscaleUrl,
	}
}

export default function Page() {
	const { keys, users, server } = useLoaderData<typeof loader>()
	const [user, setUser] = useState('All')
	const [status, setStatus] = useState('Active')
	useLiveData({ interval: 3000 })

	const filteredKeys = keys.filter(key => {
		if (user !== 'All' && key.user !== user) {
			return false
		}

		if (status !== 'All') {
			const now = new Date()
			const expiry = new Date(key.expiration)

			if (status === 'Active') {
				return !(expiry < now) && !key.used
			}

			if (status === 'Used/Expired') {
				return key.used || expiry < now
			}

			if (status === 'Reusable') {
				return key.reusable
			}

			if (status === 'Ephemeral') {
				return key.ephemeral
			}
		}

		return true
	})

	return (
		<div className='flex flex-col w-2/3'>
			<p className="mb-8 text-md">
				<RemixLink
					to="/settings"
					className="font-medium"
				>
					Settings
				</RemixLink>
				<span className="mx-2">
					/
				</span>
				{' '}
				Pre-Auth Keys
			</p>
			<h1 className='text-2xl font-medium mb-4'>Pre-Auth Keys</h1>
			<p className="text-gray-700 dark:text-gray-300 mb-4">
				Headscale fully supports pre-authentication keys in order to
				easily add devices to your Tailnet.
				To learn more about using pre-authentication keys, visit the
				{' '}
				<Link
					to="https://tailscale.com/kb/1085/auth-keys/"
					name="Tailscale Auth Keys documentation"
				>
					Tailscale documentation
				</Link>
			</p>
			<AddPreAuthKey users={users} />
			<div className="flex justify-between gap-4 mt-4">
				<div className="w-full">
					<p className="text-sm text-gray-500 dark:text-gray-300">
						Filter by user
					</p>
					<Select
						label="Filter by User"
						placeholder="Select a user"
						state={[user, setUser]}
					>
						<Select.Item id="All">All</Select.Item>
						{users.map(user => (
							<Select.Item key={user.id} id={user.name}>
								{user.name}
							</Select.Item>
						))}
					</Select>
				</div>
				<div className="w-full">
					<p className="text-sm text-gray-500 dark:text-gray-300">
						Filter by status
					</p>
					<Select
						label="Filter by status"
						placeholder="Select a status"
						state={[status, setStatus]}
					>
						<Select.Item id="All">All</Select.Item>
						<Select.Item id="Active">Active</Select.Item>
						<Select.Item id="Used/Expired">Used/Expired</Select.Item>
						<Select.Item id="Reusable">Reusable</Select.Item>
						<Select.Item id="Ephemeral">Ephemeral</Select.Item>
					</Select>
				</div>
			</div>
			<TableList className="mt-4">
				{filteredKeys.length === 0 ? (
					<TableList.Item>
						<p className="opacity-50 text-sm mx-auto">
							No pre-auth keys
						</p>
					</TableList.Item>
				) : filteredKeys.map(key => (
					<TableList.Item key={key.id}>
						<AuthKeyRow authKey={key} server={server} />
					</TableList.Item>
				))}
			</TableList>
		</div>
	)
}