<#
.SYNOPSIS
	Watches crypto rates
.DESCRIPTION
	This PowerShell script queries the current crypto exchange rates from cryptocompare.com and lists it in USD/EUR/CNY/JPY.
.EXAMPLE
	PS> ./watch-crypto-rates.ps1

	CRYPTOCURRENCY               USD                    EUR                    CNY                    JPY
	--------------               ---                    ---                    ---                    ---
	1 Bitcoin (BTC) =            97309.81               94385.57               38800                  14798679.56
	...
.LINK
	https://github.com/fleschutz/PowerShell
.NOTES
	Author: Markus Fleschutz | License: CC0
#>

function ListCryptoRate { param([string]$Symbol, [string]$Name)
	$rates = (Invoke-WebRequest -URI "https://min-api.cryptocompare.com/data/price?fsym=$Symbol&tsyms=USD,EUR,CNY,JPY" -userAgent "curl" -useBasicParsing).Content | ConvertFrom-Json
	New-Object PSObject -property @{ 'CRYPTOCURRENCY' = "1 $Symbol ($Name) ="; 'USD' = "$($rates.USD)"; 'EUR' = "$($rates.EUR)"; 'CNY' = "$($rates.CNY)"; 'JPY' = "$($rates.JPY)" }
}

function ListCryptoRates { 
	ListCryptoRate ADA   "Cardano"
	ListCryptoRate AVAX  "Avalanche"
	ListCryptoRate BCH   "Bitcoin Cash"
	ListCryptoRate BNB   "Binance Coin"
	ListCryptoRate BTC   "Bitcoin"
	ListCryptoRate BUSD  "Binance USD"
	ListCryptoRate DOGE  "Dogecoin"
	ListCryptoRate DOT   "Polkadot"
	ListCryptoRate GALA  "Gala"
	ListCryptoRate ETH   "Ethereum"
	ListCryptoRate LINK  "Chainlink"
	ListCryptoRate LTC   "Litecoin"
	ListCryptoRate LUNA  "Terra"
	ListCryptoRate MATIC "Polygon"
	ListCryptoRate SOL   "Solana"
	ListCryptoRate SUI   "Sui"
	ListCryptoRate TRUMP "Official Trump"
	ListCryptoRate WBTC  "Wrapped Bitcoin"
	ListCryptoRate XLM   "Stellar"
	ListCryptoRate XRP   "XRP"
	ListCryptoRate UNI   "Uniswap"
	ListCryptoRate USDC  "USD Coin"
	ListCryptoRate USDT  "Tether"
}

try {
	do {
		Clear-Host
		ListCryptoRates | Format-Table -property @{e='CRYPTOCURRENCY';width=28},USD,EUR,CNY,JPY
		Write-Host "(by https://www.cryptocompare.com • Crypto is volatile and unregulated • Capital at risk • Taxes may apply)"
		Start-Sleep -milliseconds 20000
	} while ($true)
	exit 0 # success
} catch {
	"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}