#!/usr/bin/env sh

install() {
  command -v uname >/dev/null 2>&1 || {
    err "Error: you need to have 'uname' installed and in your path"
  }
  command -v tar >/dev/null 2>&1 || {
    err "Error: you need to have 'tar' installed and in your path"
  }
  command -v unzip >/dev/null 2>&1 || {
    err "Error: you need to have 'unzip' installed and in your path"
  }

  local _cmd
  if command -v curl >/dev/null 2>&1; then
    _cmd=curl
  elif command -v wget >/dev/null 2>&1; then
    _cmd=wget
  else
    err "Error: you need to have 'curl' or 'wget' installed and in your path"
  fi

  get_latest_release() {
    echo $(curl --silent "https://api.github.com/repos/$1/releases/latest" |
      grep '"tag_name":' |
      sed -E 's/.*"([^"]+)".*/\1/')
  }

  echo "Fetching the latest version..."
  local _ver
  if [ "$_cmd" = curl ]; then
    _ver=$(curl --silent "https://api.github.com/repos/shurco/mycart/releases/latest" | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/') || {
      err "Error: could not fetch the latest mycart version number"
    }
  elif [ "$_cmd" = wget ]; then
    _ver=$(wget -qO- "https://api.github.com/repos/shurco/mycart/releases/latest" | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/') || {
      err "Error: could not fetch the latest mycart version number"
    }
  fi

  echo "Fetching the host system architecture..."
  local _oss
  local _cpu
  local _arc

  _oss="$(uname -s)"
  _cpu="$(uname -m)"

  case "$_oss" in
  Linux) _oss=linux ;;
  Darwin) _oss=darwin ;;
  MINGW* | MSYS* | CYGWIN*) _oss=windows ;;
  *) err "Error: unsupported operating system: $_oss" ;;
  esac
  case "$_cpu" in
  arm64 | aarch64) _cpu=arm64 ;;
  x86_64 | x86-64 | x64 | amd64) _cpu=amd64 ;;
  *) err "Error: unsupported CPU architecture: $_cpu" ;;
  esac
  _arc="${_oss}-${_cpu}"

  local _ext
  case "$_oss" in
  linux) _ext="tar.gz" ;;
  darwin) _ext="tar.gz" ;;
  windows) _ext="zip" ;;
  esac

  local _url
  _url="https://github.com/shurco/mycart/releases/download/v${_ver}/mycart_${_ver}_${_arc}.${_ext}"

  echo "Installing mycart_${_ver} for ${_arc}..."
  if [ "$_cmd" = curl ]; then
    curl --silent --fail --location "$_url" --output "mycart_${_ver}.${_arc}.${_ext}" || {
      err "Error: could not fetch the latest mycart file"
    }
  elif [ "$_cmd" = wget ]; then
    wget --quiet "$_url" -O "mycart_${_ver}.${_arc}.${_ext}" || {
      err "Error: could not fetch the latest mycart file"
    }
  fi

  if [ "$_ext" = "zip" ]; then
    unzip -o "mycart_${_ver}.${_arc}.${_ext}" || {
      err "Error: unable to extract the downloaded archive file"
    }
  else
    tar -zxf "mycart_${_ver}.${_arc}.${_ext}" || {
      err "Error: unable to extract the downloaded archive file"
    }
  fi

  rm -rf "mycart_${_ver}.${_arc}.${_ext}"

  echo ""
  echo "mycart successfully installed"
  echo ""
  echo "To see the command-line options run:"
  echo "  ./mycart --help"
  echo "To start server run:"
  echo "  ./mycart serve"
  echo ""
  exit 0
}

err() {
  echo "$1" >&2 && exit 1
}

install "$@" || exit 1