#!/bin/sh
set -eu

RELEASE_REPO="kestroll-org/cli-releases"
INSTALL_DIR="${KESTROLL_INSTALL_DIR:-$HOME/.local/bin}"
NON_INTERACTIVE="${KESTROLL_NON_INTERACTIVE:-0}"

fail() {
  echo "kestroll installer: $*" >&2
  exit 1
}

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

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

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

asset="kestroll-${os}-${arch}.tar.gz"
if [ -n "${KESTROLL_VERSION:-}" ]; then
  version="${KESTROLL_VERSION}"
  case "$version" in v*) ;; *) version="v${version}" ;; esac
  release_url="https://github.com/${RELEASE_REPO}/releases/download/${version}"
else
  release_url="https://github.com/${RELEASE_REPO}/releases/latest/download"
fi

tmp_dir=$(mktemp -d 2>/dev/null || mktemp -d -t kestroll)
trap 'rm -rf "$tmp_dir"' EXIT HUP INT TERM

echo "Downloading Kestroll CLI for ${os}/${arch}..."
curl -fsSL --proto '=https' --tlsv1.2 "${release_url}/${asset}" -o "${tmp_dir}/${asset}"
curl -fsSL --proto '=https' --tlsv1.2 "${release_url}/checksums.txt" -o "${tmp_dir}/checksums.txt"

expected=$(awk -v name="$asset" '$2 == name || $2 == "*" name { print $1; exit }' "${tmp_dir}/checksums.txt")
[ -n "$expected" ] || fail "release checksum is missing for ${asset}"

if command -v sha256sum >/dev/null 2>&1; then
  actual=$(sha256sum "${tmp_dir}/${asset}" | awk '{print $1}')
elif command -v shasum >/dev/null 2>&1; then
  actual=$(shasum -a 256 "${tmp_dir}/${asset}" | awk '{print $1}')
else
  fail "sha256sum or shasum is required"
fi
[ "$actual" = "$expected" ] || fail "checksum verification failed"

tar -xzf "${tmp_dir}/${asset}" -C "$tmp_dir"
[ -f "${tmp_dir}/kestroll" ] || fail "release archive did not contain kestroll"
chmod 755 "${tmp_dir}/kestroll"
mkdir -p "$INSTALL_DIR"

install_tmp="${INSTALL_DIR}/.kestroll-install-$$"
cp "${tmp_dir}/kestroll" "$install_tmp"
chmod 755 "$install_tmp"
mv -f "$install_tmp" "${INSTALL_DIR}/kestroll"

case ":$PATH:" in
  *:"$INSTALL_DIR":*) ;;
  *)
    profile=""
    case "${SHELL:-}" in
      */zsh) profile="${ZDOTDIR:-$HOME}/.zshrc" ;;
      */bash) profile="$HOME/.bashrc" ;;
    esac

    interactive=1
    case "$NON_INTERACTIVE" in 1|true|TRUE|yes|YES) interactive=0 ;; esac
    if [ "$interactive" = "1" ] && [ -n "$profile" ] && [ -r /dev/tty ]; then
      printf 'Add %s to PATH in %s? [Y/n] ' "$INSTALL_DIR" "$profile" >/dev/tty
      read answer </dev/tty || answer="n"
      case "$answer" in
        n|N|no|NO) ;;
        *)
          path_line="export PATH=\"${INSTALL_DIR}:\$PATH\""
          if ! grep -F "$path_line" "$profile" >/dev/null 2>&1; then
            printf '\n%s\n' "$path_line" >> "$profile"
          fi
          ;;
      esac
    fi
    echo "Add Kestroll to this shell with:"
    echo "  export PATH=\"${INSTALL_DIR}:\$PATH\""
    ;;
esac

echo "Installed Kestroll CLI to ${INSTALL_DIR}/kestroll"
"${INSTALL_DIR}/kestroll" --version