#!/bin/sh
# toa installer for Linux.
#
#   curl -fsSL https://toa-switch.pages.dev/install.sh | sh
#
# Downloads toa for this CPU, verifies it against the published SHA-256
# checksums and runs 'toa install'. Nothing is installed if the check fails.
set -eu

base='https://toa-switch.pages.dev'

case "$(uname -s)" in
Linux) os=linux ;;
*) echo "toa supports Windows and Linux only." >&2; exit 1 ;;
esac
case "$(uname -m)" in
x86_64 | amd64) arch=amd64 ;;
aarch64 | arm64) arch=arm64 ;;
*) echo "Unsupported CPU: $(uname -m)" >&2; exit 1 ;;
esac

file="$os-$arch/toa"
tmp=$(mktemp -d)
trap 'rm -rf "$tmp"' EXIT

fetch() {
	if command -v curl >/dev/null 2>&1; then
		curl -fsSL "$1" -o "$2"
	else
		wget -qO "$2" "$1"
	fi
}

echo "Downloading toa ($file)..."
fetch "$base/download/$file" "$tmp/toa"
fetch "$base/download/SHA256SUMS.txt" "$tmp/SHA256SUMS.txt"

expected=$(awk -v f="$file" '{ sub(/\r$/, "") } $2 == f { print $1 }' "$tmp/SHA256SUMS.txt")
if [ -z "$expected" ]; then
	echo "No checksum is published for $file." >&2
	exit 1
fi
if command -v sha256sum >/dev/null 2>&1; then
	actual=$(sha256sum "$tmp/toa" | cut -d ' ' -f 1)
else
	actual=$(shasum -a 256 "$tmp/toa" | cut -d ' ' -f 1)
fi
if [ "$actual" != "$expected" ]; then
	echo "Checksum mismatch for $file. The download was not installed." >&2
	exit 1
fi
echo "Checksum verified."

chmod +x "$tmp/toa"
# When piped into sh, stdin is this script; read answers from the terminal
# instead. /dev/tty can exist yet fail to open without a controlling terminal
# (CI, cron), so try opening it rather than testing that it exists.
if (: </dev/tty) 2>/dev/null; then
	"$tmp/toa" install </dev/tty
else
	"$tmp/toa" install </dev/null
fi