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import { exec } from 'https://cdn.depjs.com/exec@1.1.0/mod.ts'import { MAC_OSX_START_LINE, MAC_LINUX_START_LINE, MAC_RE, MAC_IP_RE, WIN_MAC_RE, WIN_IP_RE } from './constants.ts'
export async function getMac(interfaceName?: string) {	const isWin = Deno.build.os === 'windows'
	try {		const output = await exec(isWin ? 'ipconfig /all' : 'ifconfig')
		if (output) {			return formatMac(isWin ? getMacByIpconfig(output) : getMacByIfconfig(output, interfaceName || getInterfaceName() || ''))		}	}	catch (e) {		console.warn(e)	}
	return null}
function getInterfaceName() {	switch (Deno.build.os) {		case 'darwin':			return 'en'
		case 'windows':			return null
		default:			return 'eth'	}}
function getMacByIfconfig(content: string, interfaceName: string) {	const lines = content.split('\n')	const macList: string[] = []
	for (let i = 0; i < lines.length; i++) {		let line = lines[i].trimRight()		const m = MAC_OSX_START_LINE.exec(line) || MAC_LINUX_START_LINE.exec(line)
		if (!m) {			continue		}
		// check interface name		const name = m[1]
		if (name.indexOf(interfaceName) !== 0) {			continue		}
		let ip = null		let mac = null		let match = MAC_RE.exec(line)
		if (match) {			mac = match[1]		}
		i++		while (true) {			line = lines[i]
			if (!line || MAC_OSX_START_LINE.exec(line) || MAC_LINUX_START_LINE.exec(line)) {				i--				break // hit next interface, handle next interface			}
			if (!mac) {				match = MAC_RE.exec(line)				if (match) {					mac = match[1]				}			}
			if (!ip) {				match = MAC_IP_RE.exec(line)				if (match) {					ip = match[1]				}			}
			i++		}
		if (ip && mac) {			return mac		}		else if (mac) {			macList.push(mac)		}	}
	return macList[0]}
function getMacByIpconfig(content: string) {	const lines = content.split('\n')	const macList: string[] = []	let lastInterface: any = {}
	for (let i = 0; i < lines.length; i++) {		let line = lines[i].trimRight()		const isHeadingLine = !/^\s+/.test(line)
		if (lastInterface.ip && lastInterface.mac) {			return lastInterface.mac		}
		if (isHeadingLine) {			lastInterface = {}		}		else {			const matchIp = WIN_IP_RE.exec(line)			const matchMac = !matchIp && WIN_MAC_RE.exec(line)
			if (matchIp) {				lastInterface.ip = matchIp[1]			}			else if (matchMac) {				const mac = matchMac[1]
				if (lastInterface.ip) {					return mac				}
				lastInterface.mac = mac				macList.push(mac)			}		}	}
	return macList[0]}
function formatMac(mac: string) {	return mac ? mac.toLowerCase().replace(/-/g, ':') : null}