#!/bin/sh
# ttl64 CLI installer.
#
#   curl -fsSL https://ttl64.com/install | sh
#
# Environment:
#   TTL64_INSTALL_DIR  install directory (default: ~/.local/bin)
#   TTL64_VERSION      pin a version, e.g. 0.1.0 (default: latest)

set -eu

BASE_URL="https://get.ttl64.com/cli"
INSTALL_DIR="${TTL64_INSTALL_DIR:-$HOME/.local/bin}"

info() { printf '%s\n' "$*"; }
error() { printf 'error: %s\n' "$*" >&2; exit 1; }

command -v curl >/dev/null 2>&1 || error "curl is required"

case "$(uname -s)" in
    Linux) os=linux ;;
    Darwin) os=darwin ;;
    *) error "unsupported operating system: $(uname -s)" ;;
esac

case "$(uname -m)" in
    x86_64 | amd64) arch=amd64 ;;
    aarch64 | arm64) arch=arm64 ;;
    *) error "unsupported architecture: $(uname -m)" ;;
esac

version="${TTL64_VERSION:-$(curl -fsSL "$BASE_URL/latest")}"
version="${version#v}"
[ -n "$version" ] || error "could not determine the latest version"

asset="ttl64-$os-$arch"
tmpdir=$(mktemp -d)
trap 'rm -rf "$tmpdir"' EXIT INT TERM

info "Downloading ttl64 $version ($os-$arch)..."
curl -fsSL "$BASE_URL/v$version/$asset" -o "$tmpdir/$asset"
curl -fsSL "$BASE_URL/v$version/SHA256SUMS" -o "$tmpdir/SHA256SUMS"

expected=$(grep " $asset\$" "$tmpdir/SHA256SUMS" | awk '{print $1}')
if command -v sha256sum >/dev/null 2>&1; then
    actual=$(sha256sum "$tmpdir/$asset" | awk '{print $1}')
else
    actual=$(shasum -a 256 "$tmpdir/$asset" | awk '{print $1}')
fi
[ -n "$expected" ] && [ "$expected" = "$actual" ] || error "checksum verification failed"

mkdir -p "$INSTALL_DIR"
install -m 0755 "$tmpdir/$asset" "$INSTALL_DIR/ttl64"
info "Installed ttl64 $version to $INSTALL_DIR/ttl64"

case ":$PATH:" in
    *":$INSTALL_DIR:"*) ;;
    *) info "Add $INSTALL_DIR to your PATH: export PATH=\"$INSTALL_DIR:\$PATH\"" ;;
esac
info "Next: ttl64 login"