#!/bin/bash
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#
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set -ex

readonly WORKSPACE="${WORKSPACE:-"$(mktemp -d -t webp.js.XXX)"}"
readonly BUILD_DIR="${WORKSPACE}/webp_js/"
readonly LIBWEBP_ROOT="$(realpath "$(dirname "$0")/..")"

# shellcheck source=infra/common.sh
source "${LIBWEBP_ROOT}/infra/common.sh"

usage() {
  cat << EOF
Usage: $(basename "$0")
Environment variables:
WORKSPACE directory where the build is done
EMSDK_DIR directory where emsdk is installed
EOF
}

[[ -d "${EMSDK_DIR:?Not defined}" ]] \
  || (log_err "${EMSDK_DIR} is not a valid directory." && exit 1)

# shellcheck source=/opt/emsdk/emsdk_env.sh
source "${EMSDK_DIR}/emsdk_env.sh"

readonly EMSCRIPTEN=${EMSCRIPTEN:-"${EMSDK}/upstream/emscripten"}
readonly \
  EMSCRIPTEN_CMAKE_FILE="${EMSCRIPTEN}/cmake/Modules/Platform/Emscripten.cmake"
make_build_dir "${BUILD_DIR}"

pushd "${BUILD_DIR}"
opts=("-GUnix Makefiles" "-DWEBP_BUILD_WEBP_JS=ON")
if [[ -z "$(command -v emcmake)" ]]; then
  opts+=("-DCMAKE_TOOLCHAIN_FILE=${EMSCRIPTEN_CMAKE_FILE}")
  cmake \
    "${opts[@]}" \
    "${LIBWEBP_ROOT}"
  make -j
else
  emcmake cmake \
    "${opts[@]}" \
    "${LIBWEBP_ROOT}"
  emmake make -j
fi
popd