#!/bin/sh
set -e

RELEASES_URL="https://clireleases.blacksmith.sh/cli"
CHANNEL="${BLACKSMITH_CHANNEL:-latest}"

# Detect OS
OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
case "$OS" in
  linux|darwin) ;;
  *)
    echo "Error: unsupported OS: $OS" >&2
    echo "Blacksmith CLI supports linux and darwin (macOS)." >&2
    exit 1
    ;;
esac

# Detect architecture
ARCH="$(uname -m)"
case "$ARCH" in
  x86_64|amd64)  ARCH="amd64" ;;
  arm64|aarch64) ARCH="arm64" ;;
  *)
    echo "Error: unsupported architecture: $ARCH" >&2
    echo "Blacksmith CLI supports amd64 and arm64." >&2
    exit 1
    ;;
esac

BINARY_URL="${RELEASES_URL}/${CHANNEL}/${OS}/${ARCH}/blacksmith"
CHECKSUM_URL="${BINARY_URL}.sha256"

TMPDIR="$(mktemp -d)"
trap 'rm -rf "$TMPDIR"' EXIT

echo "Installing Blacksmith CLI (${OS}/${ARCH}) from ${CHANNEL} channel..."

# Download binary
curl -fsSL "$BINARY_URL" -o "$TMPDIR/blacksmith"

# Download and verify checksum
curl -fsSL "$CHECKSUM_URL" -o "$TMPDIR/blacksmith.sha256"
EXPECTED="$(awk '{print $1}' "$TMPDIR/blacksmith.sha256")"
if command -v sha256sum >/dev/null 2>&1; then
  ACTUAL="$(sha256sum "$TMPDIR/blacksmith" | awk '{print $1}')"
elif command -v shasum >/dev/null 2>&1; then
  ACTUAL="$(shasum -a 256 "$TMPDIR/blacksmith" | awk '{print $1}')"
else
  echo "Error: no SHA-256 tool found (need sha256sum or shasum)" >&2
  exit 1
fi

if [ "$EXPECTED" != "$ACTUAL" ]; then
  echo "Error: checksum verification failed" >&2
  echo "  expected: $EXPECTED" >&2
  echo "  got:      $ACTUAL" >&2
  exit 1
fi

chmod +x "$TMPDIR/blacksmith"

# Install to /usr/local/bin (or BLACKSMITH_INSTALL_DIR if set)
INSTALL_DIR="${BLACKSMITH_INSTALL_DIR:-/usr/local/bin}"

if [ -w "$INSTALL_DIR" ]; then
  mv "$TMPDIR/blacksmith" "$INSTALL_DIR/blacksmith"
else
  echo "Installing to $INSTALL_DIR (requires sudo)..."
  sudo mv "$TMPDIR/blacksmith" "$INSTALL_DIR/blacksmith"
fi

echo ""
echo "Blacksmith CLI installed successfully to ${INSTALL_DIR}/blacksmith"
"$INSTALL_DIR/blacksmith" --version 2>/dev/null || true
echo ""
echo "Get started:"
echo "  blacksmith auth login"
echo "  blacksmith testbox --help"