#!/bin/sh
set -eu

#region logging
if [ "${ABRASIVE_DEBUG-}" = "true" ] || [ "${ABRASIVE_DEBUG-}" = "1" ]; then
  debug() {
    echo "$@" >&2
  }
else
  debug() {
    :
  }
fi

if [ "${ABRASIVE_QUIET-}" = "1" ] || [ "${ABRASIVE_QUIET-}" = "true" ]; then
  info() {
    :
  }
else
  info() {
    echo "$@" >&2
  }
fi

error() {
  echo "$@" >&2
  exit 1
}
#endregion

#region environment detection
get_os() {
  os="$(uname -s)"
  if [ "$os" = Linux ]; then
    echo "linux"
  elif [ "$os" = Darwin ]; then
    echo "macos"
  else
    error "unsupported OS: $os"
  fi
}

get_arch() {
  arch="$(uname -m)"
  if [ "$arch" = x86_64 ]; then
    echo "x64"
  elif [ "$arch" = aarch64 ] || [ "$arch" = arm64 ]; then
    echo "arm64"
  else
    error "unsupported architecture: $arch"
  fi
}
#endregion

download_file() {
  url="$1"
  dest="$2"

  if command -v curl >/dev/null 2>&1; then
    debug ">" curl -fsSL -o "$dest" "$url"
    curl -fsSL -o "$dest" "$url"
  elif command -v wget >/dev/null 2>&1; then
    debug ">" wget -qO "$dest" "$url"
    wget -qO "$dest" "$url"
  else
    error "abrasive: install requires curl or wget but neither is installed. Aborting."
  fi
}

install_abrasive() {
  version="${ABRASIVE_VERSION:-v0.0.2}"
  os="$(get_os)"
  arch="$(get_arch)"
  install_path="${ABRASIVE_INSTALL_PATH:-$HOME/.local/bin/abrasive}"
  install_dir="$(dirname "$install_path")"

  tarball_url="https://github.com/Clavigers/abrasive-cli/releases/download/${version}/abrasive-${os}-${arch}.tar.gz"

  info "abrasive: detected ${os} ${arch}"
  info "abrasive: downloading from ${tarball_url}..."

  download_dir="$(mktemp -d)"
  download_file "$tarball_url" "$download_dir/abrasive.tar.gz"

  mkdir -p "$install_dir"
  tar -xzf "$download_dir/abrasive.tar.gz" -C "$download_dir"
  mv "$download_dir/abrasive" "$install_path"
  chmod +x "$install_path"

  rm -rf "$download_dir"

  info "abrasive: installed successfully to $install_path"
  info ""
  info "abrasive: installation complete! Try it out with: abrasive --version"
}

after_finish_help() {
  case "${SHELL:-}" in
  */zsh)
    info ""
    info "abrasive: ensure ~/.local/bin is in your PATH:"
    info "  export PATH=\"\$HOME/.local/bin:\$PATH\""
    ;;
  */bash)
    info ""
    info "abrasive: ensure ~/.local/bin is in your PATH:"
    info "  export PATH=\"\$HOME/.local/bin:\$PATH\""
    ;;
  */fish)
    info ""
    info "abrasive: ensure ~/.local/bin is in your PATH:"
    info "  fish_add_path ~/.local/bin"
    ;;
  *)
    info ""
    info "abrasive: run \`$install_path --help\` to get started"
    ;;
  esac
}

install_abrasive
after_finish_help