#!/bin/sh
# Installs the AISDLC.DEV CLI for macOS and Linux: curl -fsSL https://aisdlc.dev/install.sh | sh
# Downloads the archive for this machine from aisdlc.dev/cli, checks its SHA-256 and puts `aisdlc` in ~/.local/bin
# (AISDLC_INSTALL_DIR to change it). No sudo. Windows: download https://aisdlc.dev/cli/aisdlc_windows_amd64.zip.
set -eu

main() {
	base="${AISDLC_DOWNLOAD_BASE:-https://aisdlc.dev/cli}"
	dir="${AISDLC_INSTALL_DIR:-$HOME/.local/bin}"

	case "$(uname -s)" in
	Darwin) os=darwin ;;
	Linux) os=linux ;;
	*) fail "this installer supports macOS and Linux; on Windows download https://aisdlc.dev/cli/aisdlc_windows_amd64.zip" ;;
	esac
	case "$(uname -m)" in
	x86_64 | amd64) arch=amd64 ;;
	arm64 | aarch64) arch=arm64 ;;
	*) fail "no build for $(uname -m); supported: x86_64, arm64" ;;
	esac
	command -v curl >/dev/null 2>&1 || fail "curl is required"

	name="aisdlc_${os}_${arch}.tar.gz"
	tmp=$(mktemp -d)
	trap 'rm -rf "$tmp"' EXIT
	echo "Downloading $base/$name"
	curl -fsSL "$base/$name" -o "$tmp/$name" || fail "download failed: $base/$name"
	curl -fsSL "$base/SHA256SUMS.txt" -o "$tmp/SHA256SUMS.txt" || fail "download failed: $base/SHA256SUMS.txt"

	want=$(awk -v n="$name" '$2 == n { print $1 }' "$tmp/SHA256SUMS.txt")
	if command -v sha256sum >/dev/null 2>&1; then
		got=$(sha256sum "$tmp/$name" | awk '{ print $1 }')
	else
		got=$(shasum -a 256 "$tmp/$name" | awk '{ print $1 }')
	fi
	[ -n "$want" ] && [ "$want" = "$got" ] || fail "checksum mismatch for $name; nothing was installed"

	tar -xzf "$tmp/$name" -C "$tmp" aisdlc
	mkdir -p "$dir"
	mv "$tmp/aisdlc" "$dir/aisdlc"
	chmod 755 "$dir/aisdlc"
	echo "Installed $("$dir/aisdlc" version) to $dir/aisdlc"
	case ":$PATH:" in
	*":$dir:"*) ;;
	*) echo "Add it to your PATH (e.g. in ~/.zshrc or ~/.bashrc): export PATH=\"$dir:\$PATH\"" ;;
	esac
}

fail() {
	echo "aisdlc install: $1" >&2
	exit 1
}

# Runs only once the whole script has arrived, so a cut-off download does nothing
main "$@"