#!/bin/bash

min_rust=(1 51 0)
rust_ver=()

parse_rustc_version() {
  local IFS
  IFS=' '
  local FIELDS
  read -ra FIELDS <<< $(rustc --version)
  IFS='.'
  read -ra rust_ver <<< "${FIELDS[1]}"
}

check_rust_version() {
  parse_rustc_version
  # rust_ver=(1 46 0) for testing purposes

  if [[ "${rust_ver[0]}" -gt "${min_rust[0]}" ]] ; then
    return 0
  fi
  if [[ "${rust_ver[0]}" -lt "${min_rust[0]}" ]] ; then
    return 1
  fi
  if [[ "${rust_ver[1]}" -gt "${min_rust[1]}" ]] ; then
    return 0
  fi
  if [[ "${rust_ver[1]}" -lt "${min_rust[1]}" ]] ; then
    return 1
  fi
  if [[ "${rust_ver[2]}" -gt "${min_rust[2]}" ]] ; then
    return 0
  fi
  if [[ "${rust_ver[2]}" -lt "${min_rust[2]}" ]] ; then
    return 1
  fi

  return 0
}

if ! check_rust_version ; then
  rust_ver=$(IFS=. ; echo "${rust_ver[*]}")
  min_rust=$(IFS=. ; echo "${min_rust[*]}")
  echo "Installed rustc version $rust_ver is less than required $min_rust"
  echo
  echo "Using rustup to manage your installed version of Rust is recommended"
  echo "https://www.rust-lang.org/en-US/install.html"
  echo
  echo "See https://wezfurlong.org/wezterm/install/source.html for complete"
  echo "installation instructions for wezterm"
  exit 1
fi

if test -z "${SUDO+x}" && hash sudo 2>/dev/null; then
  SUDO="sudo"
fi

# Centos may not have lsb_release installed
if test -e /etc/centos-release || test -e /etc/fedora-release; then
  if test -x /bin/dnf ; then
    YUM="$SUDO dnf"
  else
    YUM="$SUDO yum"
  fi
  # Fedora 33 moved some perl bits around
  $YUM install -y perl-FindBin perl-File-Compare || true
  $YUM install -y \
    make \
    gcc \
    gcc-c++ \
    fontconfig-devel \
    openssl-devel \
    perl-interpreter \
    python3 \
    libxcb-devel \
    libxkbcommon-devel \
    libxkbcommon-x11-devel \
    wayland-devel \
    mesa-libEGL-devel \
    xcb-util-keysyms-devel \
    xcb-util-image-devel \
    xcb-util-wm-devel \
    rpm-build \
    redhat-lsb-core
  exit $?
fi

if test -x /usr/bin/lsb_release && test `lsb_release -si` = "openSUSE"; then
  ZYPPER="$SUDO zypper"
  $ZYPPER install -y perl-FindBin perl-File-Compare || true
  $ZYPPER install -y \
    make \
    gcc \
    gcc-c++ \
    fontconfig-devel \
    openssl-devel \
    perl \
    python3 \
    libxcb-devel \
    libxkbcommon-devel \
    libxkbcommon-x11-devel \
    wayland-devel \
    Mesa-libEGL-devel \
    xcb-util-keysyms-devel \
    xcb-util-image-devel \
    xcb-util-wm-devel \
    rpm-build
  exit $?
fi

if test -e /etc/debian_version ; then
  APT="$SUDO apt-get"
  $APT install -y \
    bsdutils \
    cmake \
    dpkg-dev \
    fakeroot \
    gcc \
    g++ \
    libegl1-mesa-dev \
    libssl-dev \
    libfontconfig1-dev \
    libwayland-dev \
    libx11-xcb-dev \
    libxcb-ewmh-dev \
    libxcb-icccm4-dev \
    libxcb-image0-dev \
    libxcb-keysyms1-dev \
    libxcb-render0-dev \
    libxcb-xkb-dev \
    libxkbcommon-dev \
    libxkbcommon-x11-dev \
    lsb-release \
    python3 \
    xdg-utils \
    xorg-dev
  exit $?
fi

if test -e /etc/arch-release ; then
  PACMAN="$SUDO pacman"
  $PACMAN -S --noconfirm --needed \
    'cargo' \
    'cmake' \
    'fontconfig' \
    'git' \
    'hicolor-icon-theme' \
    'libx11' \
    'libxkbcommon-x11' \
    'pkgconf' \
    'python3' \
    'rust' \
    'wayland' \
    'xcb-util-image' \
    'xcb-util-keysyms' \
    'xcb-util-wm'
  exit $?
fi

case $OSTYPE in
  darwin*|msys)
    exit 0
  ;;
  freebsd*)
    PKG="$SUDO pkg"
    $PKG install -y \
      cmake \
      curl \
      egl-wayland \
      expat \
      fontconfig \
      gcc \
      gettext \
      git \
      gmake \
      libxcb \
      libxkbcommon \
      mesa-devel \
      openssl \
      p5-ExtUtils-MakeMaker \
      perl5 \
      pkgconf \
      python3 \
      rust \
      wayland \
      xcb-util-image \
      xcb-util-keysyms \
      xcb-util-wm \
      z \
      zip
    exit $?
    ;;
  *)
    echo "Please contribute the commands to install the deps"
    echo "For `lsb_release -ds`"
    exit 1
  ;;
esac