import { sendCommand, setEndpoint, testEndpoint } from './utils.js'

/**
 * Handler for settings form.
 *
 * @param {Event} event Settings form submit event.
 * @returns {Promise<void>}
 */
export async function settingsHandler(event) {
	// Don't interrupt event if not form submitting
	if (!(event instanceof SubmitEvent)) return true
	if (event.target === null) return true
	// Disable form sending
	event.preventDefault()

	const form = new FormData(event.target)
	const ipAddress = form.get('ip-address')

	if (ipAddress === null) return

	const endpoint = `http://${ipAddress}`
	await testEndpoint(endpoint)
	setEndpoint(endpoint)
}

/**
 * Attach command to touch controls buttons.
 *
 * @this HTMLButtonElement
 * @returns {Promise<void>}
 */
export function controlButtonHandler() {
	const { command, value } = this.dataset

	// Check datas are set for button
	if (command === undefined || value === undefined) {
		alert(`Pas de command ou de valeur assigné au bouton "${this.title}"`)
		throw new Error(`no command or value assigned to ${this.title}`)
	}

	// Check command is valid
	if (!['forward', 'backward', 'left', 'right', 'stop'].includes(command)) {
		alert(
			`La command "${command}" n'est pas valide en tant que ('forward', 'backward', 'left', 'right', 'stop')`
		)
		throw new Error(
			`specified command "${command}" is not in ['forward', 'backward', 'left', 'right', 'stop']`
		)
	}

	// Check value is valid finite number
	if (!Number.isFinite(Number(value))) {
		alert(`La valeur "${value}" n'est convertible en entier fini`)
		throw new Error(`value "${value}" cannot be casted to finite integer`)
	}

	sendCommand(command, Number(value))
}

/**
 * Handler for keyboard events.
 *
 * @param {KeyboardEvent} event Keyboard event.
 * @returns {Promise<void>}
 */
export function keyboardHandler({ code }) {
	if (code === 'ArrowUp') {
		return sendCommand('forward', 2)
	}
	if (code === 'ArrowDown') {
		return sendCommand('backward', 2)
	}
	if (code === 'ArrowLeft') {
		return sendCommand('left', 5)
	}
	if (code === 'ArrowRight') {
		return sendCommand('right', 5)
	}
	if (code === 'Space') {
		return sendCommand('stop', 0)
	}
}