#!/bin/bash

readonly BUILD_CONTENT="/tmp/build_content"
readonly WASI_SDK_VER=11.0
readonly WASI_SDK_FILE="wasi-sdk-${WASI_SDK_VER}-linux.tar.gz"
readonly WABT_VER=1.0.19
readonly WABT_FILE="wabt-${WABT_VER}-ubuntu.tar.gz"
readonly CMAKE_VER=3.16.2
readonly CMAKE_FILE="cmake-${CMAKE_VER}-Linux-x86_64.sh"
readonly BINARYEN_VER=version_97
readonly BINARYEN_FILE="binaryen-${BINARYEN_VER}-x86_64-linux.tar.gz"
readonly BAZEL_VER=3.7.0
readonly BAZEL_FILE=bazel-${BAZEL_VER}-installer-linux-x86_64.sh

function DEBUG() {
  [[ -n $(env | grep "\<DEBUG\>") ]]
}

#
# install dependency
function install_deps() {
  apt update
  apt install -y lsb-release wget software-properties-common \
      build-essential git tree zip unzip
}

#
# install clang
function install_clang() {
  if [[ ! -f llvm.sh ]]; then
    wget https://apt.llvm.org/llvm.sh
  fi

  chmod a+x llvm.sh
  ./llvm.sh 11
}

#
# install wasi-sdk
function install_wasi-sdk() {
  if [[ ! -f ${WASI_SDK_FILE} ]]; then
    wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-11/${WASI_SDK_FILE}
  fi

  tar zxf ${WASI_SDK_FILE} -C /opt
  ln -sf /opt/wasi-sdk-${WASI_SDK_VER} /opt/wasi-sdk
  ln -sf /opt/wasi-sdk/lib/clang/10.0.0/lib/wasi/ /usr/lib/llvm-11/lib/clang/11.0.1/lib/
}

#
# install wabt
function install_wabt() {
  if [[ ! -f ${WABT_FILE} ]]; then
    wget https://github.com/WebAssembly/wabt/releases/download/${WABT_VER}/${WABT_FILE}
  fi

  tar zxf ${WABT_FILE} -C /opt
  ln -sf /opt/wabt-${WABT_VER} /opt/wabt
}

#
# install cmake
function install_cmake() {
  if [[ ! -f cmake-${CMAKE_VER}-Linux-x86_64.sh ]]; then
    wget https://github.com/Kitware/CMake/releases/download/v${CMAKE_VER}/${CMAKE_FILE}
  fi

  chmod a+x ${CMAKE_FILE}
  mkdir /opt/cmake
  ./${CMAKE_FILE} --prefix=/opt/cmake --skip-license
  ln -sf /opt/cmake/bin/cmake /usr/local/bin/cmake
}

#
# install emsdk
function install_emsdk() {
  cd /opt
  git clone https://github.com/emscripten-core/emsdk.git
  cd emsdk
  git pull
  ./emsdk install latest
  ./emsdk activate latest
  echo "source /opt/emsdk/emsdk_env.sh" >> ${HOME}/.bashrc
}

#
# install binaryen
function install_binaryen() {
  if [[ ! -f ${BINARYEN_FILE} ]]; then
    wget https://github.com/WebAssembly/binaryen/releases/download/${BINARYEN_VER}/${BINARYEN_FILE}
  fi

  tar zxf ${BINARYEN_FILE} -C /opt
  ln -sf /opt/binaryen-${BINARYEN_VER} /opt/binaryen
}

#
# install bazel
function install_bazel() {
  if [[ ! -f ${BAZEL_FILE} ]]; then
    wget https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VER}/${BAZEL_FILE}
  fi

  chmod a+x ${BAZEL_FILE}
  ./${BAZEL_FILE}
}

#
# MAIN
DEBUG && set -xevu
if [[ ! -d ${BUILD_CONTENT} ]]; then
  mkdir ${BUILD_CONTENT}
fi

cd ${BUILD_CONTENT}
if DEBUG; then
  $@
else
  install_deps \
    && install_clang \
    && install_wasi \
    && install_wabt \
    && install_cmake \
    && install_emsdk \
    && install_binaryen \
    && install_bazel
fi
cd - > /dev/null
DEBUG && set +xevu