#!/usr/bin/env bash
set -euo pipefail

WEB_EMSCRIPTEN_VERSION="3.1.69"
web_workspace_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"

if command -v emcc >/dev/null 2>&1; then
  detected_version="$(emcc --version | awk '{for (i = 1; i <= NF; i++) if ($i ~ /^[0-9]+\.[0-9]+\.[0-9]+$/) {print $i; exit}}')"
  if [[ "${detected_version}" != "${WEB_EMSCRIPTEN_VERSION}" ]]; then
    echo "Expected Emscripten ${WEB_EMSCRIPTEN_VERSION}, found ${detected_version}" >&2
    exit 1
  fi
else
  echo "emcc was not found; install or activate emsdk ${WEB_EMSCRIPTEN_VERSION}" >&2
  exit 1
fi

export WEB_EMSCRIPTEN_VERSION
export EM_CONFIG="${web_workspace_root}/.emscripten-web"
export EM_CACHE="${web_workspace_root}/.emcache"
export WEB_EMSCRIPTEN_CFLAGS="-sENVIRONMENT=web,worker -sMODULARIZE=1 -sEXPORT_ES6=1"
export WEB_EMSCRIPTEN_LDFLAGS="-sALLOW_MEMORY_GROWTH=1 -sFILESYSTEM=1"

if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
  emcc --version | head -3
  node --version
  cmake --version | head -1
fi